JPH0261399B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a writing instrument that automatically feeds a lead and automatically follows a succeeding lead during writing, and that slides within the tip of the writing instrument in the axial direction and that the tip of the writing instrument a core guide tube with a core brake and an insertion slide protruding from the core; a clamping device comprising at least a radially open forceps-like clamping body and a clamping stopper; a core guide tube and a clamping device; It is equipped with a compression spring that is placed between the bodies and acts on both the core guide tube and the clamping body, and in this case, it is designed so that no self-locking action occurs between the clamping body and the clamping stopper. Regarding.

A writing instrument of this type is known, for example, from DE 30 32 200 A1.

However, in this writing instrument, due to the compression spring disposed in a direct and constantly operative connection between the lead guide tube and the forceps-like clamping body, the clamping body and the lead stick to each other when not used for a relatively long period of time. mutual respect, or
The core tends to develop cold brittleness, which can lead to failure in either case. Additionally, known writing instruments use compression springs and other
The lengths and forces of the cooperating parts must be very precisely matched, which makes the writing instrument difficult and sometimes expensive to manufacture.

According to German Patent Application No. 2611608, a forceps-like clamping body has a web on its end side, in which a sleeve attached to a core guide tube is movable in the axial direction. The information listed in this guide is now publicly known.

The lead guide tube is urged towards the tip of the writing instrument, inter alia, by a spring arranged on it, while a further spring acts in the opposite direction on the clamping body. In this case, too, in particular a very precise matching of the two springs to one another and a special thrust bearing for the clamping body are required. Furthermore, it is impossible to automatically follow the following lead, and in order to feed the following lead, a push knob must be operated.
The clamping mechanism must thereby be opened manually so that a new core can be gripped by the clamping jaws of the clamping body.

US Pat. No. 3,424,535 proposes that a writing instrument be provided with a plurality of forceps-like clamping bodies or clamping jaws that engage each other inwardly and outwardly.
Two of these clamping bodies or clamping jaws are provided with webs projecting from their end faces, and compression springs are arranged on the circumferential surfaces of the webs. The compression spring acts directly on one clamping jaw on the one hand and indirectly on the core guide tube on the other hand. This proposal as a whole would result in a writing instrument that is extremely complex and expensive, and is also extremely prone to failure due to the large number of parts that engage in and out of each other.

Two further lead-feeding writing instruments are described in German Patent Application No. 2153400 and U.S. Pat. No. 3864046.
In this case, a compression spring is arranged between the axially movable core guide tube and the forceps-like clamping body. In the case of these writing instruments as well, extremely complex tightening and spring mechanisms have been proposed that are difficult to harmonize with each other, and these mechanisms have an extremely high failure rate due to the large number of parts that cooperate with each other. have.

It is therefore an object of the present invention to provide a writing instrument with automatic lead feeding and automatic follow-up of the following lead during writing, which allows relatively large production tolerances and which can thus be produced inexpensively. and has a particularly reliable function, in which the lead is held with as little radial clamping force as possible, especially in the rest position, so that writing can be carried out for long periods of time without breakdowns and without additional manual intervention. The purpose is to do so.

This problem is solved by the invention having the features set forth in claim 1.

On the end side of the forceps-like clamping body there is assigned an axially oriented web and a stopper collar, between which a compression spring is arranged with a direction of action parallel to the axis of the writing instrument, and The compression spring is arranged directly or indirectly on the stopper collar via at least one contact point transmitting a pressing force in the radial and axial direction and also on or on the core guide tube via a contact surface. In the part where
The working connection makes it possible to compensate for manufacturing tolerances in a very simple manner, so that the individual parts can be produced relatively easily and there is sufficient assembly play. Furthermore, the solution described above significantly improves the clamping action and the overall effect of the clamping body, so that a particularly reliable function and trouble-free transport of the core are obtained. Furthermore, the point of contact between the compression spring and the stopper collar is such that the axial force of the compression spring is converted into axial and radial pressure, and both pressures cause the axial release of the clamping jaw of the clamping body. Due to the radial opening design, the clamping body is always open in the rest position. This ensures that, on the one hand, the first wick always remains untightened, since it is merely held by the wick brake; and, furthermore, that the subsequent wick always remains untightened, since it is merely held by the wick brake. The end of one wick can be dropped through the clamping body, which ensures automatic follow-up of the following wick.

In the writing instrument according to the invention, the clamping body consists of two or more radially movable clamping jaws which are in contact with each other at their rear ends or are connected to each other. It is also possible to construct it in one piece or to consist of individual segments. The clamping body is usually a radial slit,
It has a rear enlarged hole and a clamping hole for holding the core immobile, optionally with teeth or other clamping means, and is made of metal, preferably brass or relatively hard plastic. It can also consist of

The web, which preferably extends at right angles from the end side, has a particularly high bending strength in order to be able to transmit the radial force of the compression spring as completely as possible to the contact point of the clamping body. Preferably, the material is made to have a non-elastic structure.

The stopper collar extends radially inward;
and serves as an abutment support for the compression spring, directly or via a pressure insert, or as an axial limiter towards the tip of the writing instrument, in which case the stop collar, together with the compression spring or the pressure insert, at least has a conical shape. The axial spring force is converted into an axial thrust by a surface of the shape, preferably with an angle of 45°.
In some cases, this is divided into a somewhat smaller radial spreading force and deflected.

If the compression spring itself does not have an effective compression edge on the end side, a compression insert is arranged between the compression spring and the stopper collar, on which the compression spring is supported and the compression insert It is particularly advantageous if the body loads the stopper collar without self-locking effects, so that a non-self-locking contact point is created between the two parts.

The web and stopper collar are usually arranged in a cage around a compression spring and an optionally arranged pressure insert, so that these parts have radial play within the web and stopper collar and can be easily removed. Retained for movement. The pressure insert can have an extension facing the spring and/or towards the core guide tube, which serves for centering the compression spring and/or the pressure insert in the stopper collar. , the above-mentioned appendage can also be made as a contact appendage for the core guide tube.

However, in a simple manner, an extension of the core guide tube or an insertion slide fixed thereto, directed into the shaft tip, can also serve as a contact attachment;
In contrast, a compression spring or a pressure insert has a contact surface that rests against the extension, which contact surface itself is optionally arranged in the centering section.

In order to prevent the compression spring or the pressure insert from being tightened and locked, the contact points must be constructed so that they do not have a self-locking effect on the stop collar. For this purpose, on the one hand, it is suitable to use conical pressure ramps or pressure stops, and on the other hand to use pressure edges, in which case it is in principle possible to form contact points of any type on any part. You may. In this case, it is advantageous if the contact point is formed by two sloped surfaces that touch and slide against each other.
The cone angle or angle of inclination of the slope or pressure slope and/or pressure stop is such that the spring force, initially directed exclusively in the axial direction, in cooperation with the gravitational force of the other movable parts of the clamping device, causes the clamping body to It is advantageous to choose such that the spreading force acts radially on the clamping jaws and thus produces a large axial force.

This is easily accomplished by having a 45° slope. This is because, on the one hand, this angle of inclination divides the spring force evenly, and on the other hand, the movable parts of the tightening device,
In particular, the gravitational force of the forceps-like clamping body increases the axial force in a targeted manner. The angle of inclination may, however, also be affected by special frictional, weight or other spring elasticity conditions, for example if the forceps-like clamping body or its clamping jaw has an inherent spring elasticity radially inwards or outwards. , can be changed. In such cases, care must be taken, inter alia, to always have good separability and to avoid any self-locking effects.

In the writing instrument of the invention, in order to ensure that the clamping body is always opened satisfactorily and can be opened immediately even when the clamping pressure is low, the clamping body and the clamping sleeve, the sliding sleeve or the casing are directly connected to each other. It must be constructed so that no self-locking action occurs between it and the provided tightening stopper. For this purpose, the spheres as rolling elements or the disks or rolls are supported in recesses of the clamping body or clamping sleeve and rest against a sliding cone surface, which preferably has a hard surface. is particularly advantageous. By forming the abutment surface into a conical shape, even when the cone angle is relatively small, it is possible to provide each assembled member with a relatively large tolerance without causing a self-locking effect.

Instead of rolling elements, it is also possible to provide contact edges, such as at contact points in stopper collars, which contact edges rest against a contact cone surface or a sliding cone surface and selectively contact a clamping body or clamping member. Can be placed in the sleeve.

In order to keep the ineffective pressure distance of the core guide tube as short as possible, it is provided that the core guide tube and the compression spring as well as any intermediate parts, such as contact and/or pressure application, are permanently connected to one another. It is advantageous to do so. For this purpose, all parts that cooperate functionally, especially those parts extending along the axis of the writing instrument, must be
They should be matched to each other so that the compression spring (or pressure insert) and the stopper collar contact the contact surface between the core guide tube and the compression spring without play or with a slight play. be.

The greater the intended manufacturing tolerances, the greater the play in the area of the contact surface, if applicable, unless, for example, any other compensation measures are provided in the area of the contact point between the clamping body and the clamping stop. be able to.

The function of a writing instrument is that when the lead guide tube is brought into contact with a writing surface or a paper surface, and when the lead guide tube is used for writing, the writing instrument or It is activated by moving the writing instrument from its rest position to its writing position by sliding into the shaft tip. Due to the separation of the contact point or the separation of the compression spring or pressure insert from the stopper collar and the simultaneous reinforcement of the clamping force of the compression spring directed towards the clamping body, the clamping body can be moved in the axial direction. It is moved backwards and moved radially inward by the inclination of the sliding cone surface or the contact cone surface. In this case, the radially directed clamping force of the clamping body on the core is increased until its axial clamping force becomes greater than the axial holding force of the core brake, so that the core is It is held immovably by a chisel and becomes writable.

The lead guide tube is used together with the lead brake when writing.
It can be slid into the shaft tip until at most the end face of the core guide tube lies in the same plane as the end face of the shaft tip. At the latest at this time, but usually significantly earlier, the writing instrument is lifted and applied anew to the paper.

During or after separation of the lead guide tube from the writing or paper surface, the lead guide tube is moved in the axial direction of a compression spring which transmits a force to the lead guide tube via the contact surface and possibly the contact attachment. Due to the force, it slides forward until it abuts a stop, thereby converting the writing position into the rest position. However, before the core guide tube comes into contact with the stop, the clamping body is moved axially forward and radially outwards via the point of contact between the stop collar and the compression spring or pressure insert. This eliminates the radial clamping action or force of the clamping body and releases the core. Due to the holding force of the lead brake, the lead is then carried forward together with the further axial forward movement of the lead guide tube, that is, towards the tip of the writing instrument, so that the writing instrument is newly ready for writing. Become.

According to the invention, the forceps-like clamping body or its clamping jaw is always open in the rest position, so that the subsequent core can fall through the clamping body or its clamping jaw, or It can be reliably held and transported while abutting against the rear end of the lead currently in use.

In order to prevent the axial pushing force on the lead from becoming too large, for example due to high writing pressures, it is advantageous to design the clamping sleeve or the part containing the clamping stop as an axially movable sliding sleeve. . This allows the entire tightening device to escape upwards or backwards. The sliding sleeve can be freely movable or can be loaded by a balance spring, the pressing force of which can be selected or adjusted according to the respective needs. It can also be made adjustable to different values by suitable means, for example by means of corresponding bearings which are adjustable in the housing.

The pressing forces acting axially forward include the gravity of all axially movable parts, such as the clamping device, the sliding tube piece and the sliding sleeve itself,
Advantageously, it is slightly greater than the opposing force of the compression spring. The magnitude of the pressing force may optionally also be selectable or adjustable to different values as a function of the hardness or wear properties of the core.

The writing instrument according to the invention can be used particularly advantageously as a hand writing instrument. By making the shaft of the writing instrument compatible with a receptacle of an automatic writing device or an automatic drafting machine, or by manufacturing the receptacle so that it is compatible with the shaft of a writing instrument, the writing instrument of the present invention can be adapted to these devices or It can also be used very well in machinery, which provides very favorable working conditions.

Furthermore, the object is solved by the invention in a writing instrument of the type mentioned at the outset, which has the features set forth in claim 15.

The conveyance of the lead to the tip of the writing instrument is carried out in such a way that the lead guide tube and the lead are moved against the action of a clamping device by being brought into contact with the writing surface during writing, and the clamping device is closed. I, by this, the core,
It is held stationary against the writing pressure, and when removed from the writing surface, the lead guide tube is moved forward or downward, as the case may be, by the action of a compression spring, in which case the lead held by the lead brake. A writing instrument of the type mentioned at the outset, in which the above-mentioned forward movements are carried out together, and in which case the clamping body is opened at the same time, so that the lead is released from the clamping body, is disclosed in German Patent No. 2837586 It is also described in the specification of the Japanese patent application No. 3112869 and the specification of the patent application No. 3229497.

However, these known writing instruments or the writing instruments described in the above specification have extremely complicated structures,
Very narrow manufacturing tolerances have to be maintained, which also has the disadvantage that the manufacturing costs are very high or that the core guide tube has a relatively long sliding distance in which it cannot function.

However, with this configuration of the invention, the self-feeding writing instrument can also have large axial manufacturing tolerances, especially in the area of the writing instrument tip, without adversely affecting the writing performance, and is also inexpensive to manufacture. become able to.

Further, with this configuration of the present invention, the fall stopper limits the axial movement distance of the clamping body, and the sliding brake prevents the core guide tube or the insertion slide immovably connected to the core guide tube. The child remains permanently in the axial position it occupies when lifted from the writing surface. By limiting the travel distance in this way, the axial play due to manufacturing tolerances is limited, i.e. the axial free travel that impairs the writing characteristics, as observed when the writing instrument is applied to the writing surface. limited.

The invention will now be explained with reference to the illustrated embodiments.

The writing instrument 1 shown in FIG. 1 is in a rest position. The housing or shaft 3, into which the shaft tip 31 is screwed, contains a clamping sleeve 78 with a closure 76, which has a sliding conical surface 73 and a partially expanded opening. It has an aperture 74 and is axially fixed immovably between the extension 37 on the casing or the shaft and the inner end of the shaft tip 31. The closing part 76 has a sliding slope 77, so that a refill, which is optionally placed in the lead storage part 8, can automatically slide into the closing part 76 and into the center hole of the forceps-like clamping body 40. The tightening sleeve 78 can be removed from above.
That is, it is closed from the rear side of the writing instrument, and the lead storage section 8
is closed from the bottom.

The clamping body 40 disposed within the clamping sleeve 78 has a stopper collar 43 at the end 42 of its shaft portion to prevent it from falling off, and may also have an additional weight. It is divided by a split slot into radially flexible or possibly spring-elastic clamping jaws, which are open in the position shown. In the recess 48 there is a spherical rolling element 47 which on the other hand rests against a sliding conical surface 73 . Inside the shaft tip 31, there are an insertion slide 21 that abuts the bottom stopper 35 and is movable in the axial direction, and a core guide tube 2. In this case, the insertion slide 21 is connected to the core brake 22 (the core brake 22 has a contact extension 23 (which only holds the wick 5 in the position shown) and a contact extension 23, and the wick guide tube 2 is immovably connected to the wick brake 22 and the insertion slide 21. , protrudes from the shaft tip 31 to the maximum extent in the illustrated rest position.
An end stopper 27 is immovably arranged in the shaft tip 31 as a member to prevent it from falling out when the writing instrument is disassembled. If there is no bottom stopper 35 or stopper collar 43 at the end 42 of the shaft of the clamping body 40 to prevent it from falling out, the insertion slide 21 will move from the bottom to the top, and the clamping body 40 will move from the bottom to the top. It can be touched from above.

According to the present invention, in such a writing instrument, the clamping device 4 or its clamping body 40 is provided with a web 44 extending in the axial direction from the end face 41 and having high bending strength, and fixedly disposed on this web 44. Stopper collar 45 facing radially inward
The stopper collar 45 has a conical pressing stopper 46.

Within the web 44 is a compression spring 6 acting in the axial direction.
0, this compression spring 60 is applied on the one hand to the end face 41 of the clamping body 40 and on the other hand to the pressure insert 61, which also belongs to the web 44.
It rests in a compressed manner on the rear surface, which serves as a spring stop 64. The pressure insert 61 has a pressure slope 66 on the side of the stopper collar 45 and also has a contact surface 63 emanating from the through hole 62 and a centering part 67 for the rear end of the contact extension 23 . have. A slight gap may be created between the contact surface 63 and the end surface of the contact addition portion 23 at the rest position where the writing instrument 1 is away from the paper surface 100.

FIG. 2 shows the writing instrument 1 in the writing position, in which the lead guide tube 2 and the lead 5 are connected to the paper surface 100 or the writing surface in a state where writing pressure is generated. In this case, the bottom stop 35 in the shaft tip 31, which is screwed into the housing or the shaft 3, is open. This is because the insertion slide 21 has a recess for receiving the core brake 22 and together with the filling body 25 to which the core guide tube 2 is fixed.
This is because it is in a position where it is pushed into the writing instrument 1.
The contact addition portion 23 is in contact with the contact surface 63,
Further, the pressing insert 61 is pushed rearward against the action of the compression spring 60 that is in contact with the end surface 41 of the forceps-like clamping body 40, thereby tightening the clamping body 40. The jaw is closed via the rolling elements 47, which slide along the sliding cone surface 73 when pushed in, and the core 5 is held stationary. End stop collar 2
7 additionally serves in this case as a guide sleeve for the insertion slide 21. In order to ensure a good introduction of the contact extension 23 into the centering part 67 of the pressure insert 61, the contact extension 23 is fitted with a centering cone 2.
It has 4.

The pressure insert 61 has a stop 64 and a guide 65 for centering the reception and abutment of the compression spring 60, as well as a pressure ramp 66 which has a through hole 62 and is open in the position shown. After the writing instrument is released from the paper surface 100, the pressing slope hits the pressing stopper 46 of the stopper collar 45, which is connected to the clamping body 40 with high bending strength via the web 44. It contacts and pulls the clamping body 40 or its clamping jaw downwards, and also pushes open in the radial direction under the action of the slope of the contact point, so that the core 5 is released from the clamping jaw. At the end 42 of its shaft, the clamping body 40 has a stop collar 43 which serves as a sliding guide;
The clamping body 40 is also in this embodiment arranged for the most part inside a clamping sleeve 78 which is arranged in the housing 3 and which on the one hand has a closing part with a sliding slope 77. 76
On the other hand, by the fixing ring 75,
each is closed, so that the tightening device 4 as a whole forms a closed assembly unit,
This unit is adapted to be inserted as a whole into the casing 3. The through holes 62 in the pressing insert 61 and the closing part 76, each having a relatively large diameter, as well as in the enlarged transparent hole of the clamping body 40 and in the core storage part 8, are arranged sequentially toward the rear. The lead 5, the succeeding lead 51, and the refill 52 are located in the area, and all of these can be operated without any modification.
Completely consumed by writing.

In FIG. 3, the shaft tip 31 is shown enlarged without a core; in this variant, the core guide tube 2 is fixed in a filling body 25, which at the same time controls the core brake 22. , and is surrounded by an insertion slide 21, and this insertion slide 2
1 extends into a contact extension 23 with a centering cone 24 , in which case the insertion slide or filler 25 rests on a bottom stop 35 . End stopper 27 installed within shaft tip 31
has a sliding brake 26 which rests with a radial spring force on the contact extension 23, which is machined with a split slit, so as to prevent the free sliding movement of the core guide tube 2, if necessary. is affected. A fixing ring 75 is fixed in the clamping sleeve 7, through which a large hole passes a web 44 with a stop collar 45 and a pressure stop 46.

A pressing slope 66 of a pressing insert 61 is in contact with the pressing stop 46 , and a compression spring 60 centered by a guide 65 is attached to the spring stop 64 .
is supported, this pressure insert 61, as well as the contact extension 23, which in this case does not rest completely on the contact surface 63, has a through hole 62, the diameter of which is not shown in this figure. The diameter of the wick is larger than that of the wick, so that the wick can fall in front of the wick brake 22 due to play.

According to FIG. 4, the stop collar 45 arranged on the web 44 has an inclined pressure stop 46, whereas the pressure edge 68 of the pressure insert 61, which is made in one piece with the compression spring 60, has a pressure stop 46 on both parts 4.
5,61 contact points are formed. Contact addition part 23
Inside, the core 5 is positioned with play. This pressure insert 61 can in this case be made of a hard but spring-elastic plastic together with a compression spring 60 or an equivalent spring leaf.

In the embodiment of FIG. 5, a normal coil compression spring 6
0 has a pressure edge 68 and a contact surface 63 formed directly on the compression spring 60, on which the contact extension 23 is supported. Also in this embodiment, a web 44 extends parallel to the axis from the forceps-like tightening body 40, and a stopper collar 45
It continues to. The wick 5 is held in this case not by a clamping body 40, but by a wick brake 22, which is not shown.

In the embodiment of FIG. 6, a pressure insert 61 is shown inside the web 44, which rests against the stopper collar 45, which comprises a guide 65 for centering the compression spring 60 as well as a core guide tube. It has a contact addition part 23 for directly influencing the contact area 2 if necessary.

In the embodiment of FIG. 7, the core 5 is held by a core brake 22 arranged in the core guide tube 2, which at the same time also serves as a sliding brake 26 in the shaft tip 31. At its axially inner end, the core guide tube 2 loads directly onto a spring-loaded pressure insert 61 which, with its conical pressure stop 46, presses against the pressure edge 68 of the stop collar 45. It is in point-like or annular contact with the The clamping body 40 has an inclined contact cone 49 which, together with an inner contact edge 72 of the end face 71 of the sliding sleeve 79,
0.79 contact points are formed. In this case, depending on the pressure and friction conditions in each case, the angle of inclination of the two pressure ramps is varied in such a way that a satisfactory function is ensured.

FIG. 8 shows a writing instrument 1 according to an embodiment of the invention, the entire clamping device 4 of which is mounted in the casing or shaft 3 in the axial direction by a sliding sleeve 79 against the spring force of a balance spring 96. It is possible to move. The balance spring 96 is arranged axially with the movable core tube 81 of the core store 8 and is supported on the one hand on this core tube and on the other hand on the shoulder of the housing upper part 33. central part 32
The upper part 33 connected to the eraser further has a clip 94 held by a clip ring 95, a closure cap 34, and an eraser 91 with a cleaning needle 92 and a retaining ring 93. The other configurations of the important parts for the present invention are the same as those of the embodiment shown in FIG. 2, but in the case of this FIG.
is shown without a core and in the rest position.

Furthermore, although not shown in FIGS. 1 to 8, it is also possible to arrange a contact addition part on the compression spring, or to form the contact point as a pressing slope.

A writing instrument 101 of the present invention shown in FIG.
Eraser 154 with 56, closure cap 15
7 and a clip 158. Writing implements 10
1 further includes a core storage section 153 and a tightening device 104, which mainly includes:
A clamping sleeve 141, which in this case is axially movable and is spring-loaded by a compensating or balancing spring 106, as well as a forceps-like structure, which is also axially movable, with a shaft 145, a stop collar 146 and a rolling element 147. It consists of a fastening body 143. The sliding conical surface 142 in the contact range of the rolling element 147
A tightening stopper 140 is formed at. The fixing ring 159 prevents the rolling elements 147 from unintentionally coming off the clamping device 104 .
The clamping body 143 has in its front region a stop collar 148 arranged on the web 149 , the inner slope of which serves as a contact point for a pressure slope 151 of a pressure insert 150 loaded by a compression spring 152 . In the shaft tip 121 there is a fixedly arranged insert 125, which axially fixes the sliding brake 134 and forms a fall stop 135.

The core guide tube 103 , which is axially movable within the shaft tip 121 , has an insertion slide 131 with a contact extension 133 and a core brake 132 . In the illustrated rest position, the end face of the insertion slide 131 is spaced from the bottom stop 122 of the slide hole 124 by a permissible distance b. This is because the writing instrument 101 is lifted from the writing surface 200 and the insertion slide 131 is held together with the lead guide tube 103 in a frictional manner by the sliding brake 134. The travel distance a of the clamping body which causes the clamping body to open in the radial direction is zero in this case. The distance of contact surface 163 is shown enlarged.

10 and 11 show a writing instrument 101 which is in principle the same as the writing instrument 101 shown in FIG.
is also shown without lead and in the rest position (FIG. 10) and in the writing position (FIG. 11). In this case, the possible position changes of the parts in the axial direction are each indicated by curved lead lines (relative to FIG. 11).
The moving distance a is zero in the rest position (Fig. 10), whereas it is visible in the writing position (Fig. 11), and the distance c is formed from the moving distance a, the tolerance distance b, and the writing distance. . The writing instrument 101 is the first
In the rest position shown in FIG. 0, the clamping jaws of the clamping body 143 are open.

This is because the pressing insert 150 is the compression spring 1.
The stopper collar 148 tightens the jaw by the action of 52.
This is because it is moved radially outward and axially forward (or downward) through the drop stopper 135 until it comes into contact with the drop stopper 135. Travel distance a
Therefore, the maximum value of
0, not shown here), which should be as small as possible. At the rest position (FIG. 10), the moving distance a is zero.

When the writing instrument 101 is separated from the writing surface 200, the insertion slide 131 and the lead guide tube 10 are removed through the pressing insert 150 and the contact adding portion 133.
3 is a tightening body 143 and/or a pressing insert body 150
is moved forward until it hits the drop stopper 135. In this case, the core 11 (not shown)
0 are moved forward or downward together under the action of the radial holding force of the core brake 132.

When the axial movement of the clamping body 143 or the pressing insert 150 ends (when the moving distance a becomes zero)
Immediately insert the insertion slide 131 or the core guide tube 103.
The axial forward movement of is also terminated. This is because it is held immobile by the radial holding force of the sliding brake 134.

Therefore, the axial pressing force of the compression spring 152 must be greater than the axial holding force of the sliding brake 134. But on the other hand the sliding brake 1
The axial holding force of 34 is greater than the axial gravity of the core guide tube 103, including the insertion slide 131 and the upper and lower cores 110, 111, when the spring force no longer acts effectively. For effective braking, it must be large.

Based on the above assumptions, the axial free space left between the bottom stopper 122, the slide hole 124 and the front edge of the insertion slide 131 can be chosen to be practically any size as the tolerance distance b. Alternatively, it can be made relatively large based on manufacturing tolerances. The functionally ineffective sliding distance of the lead guide tube 103, which must first be overcome at the beginning of writing, is thereby no longer produced due to the action of the sliding brake 134. The core is held immovable in this rest position only by the holding force of the core brake 132. This is because the clamping body 143 is open. By the way, as shown in FIG. 11, when the lead guide tube 103 is used for writing or when its tip comes into contact with the writing surface 200, the shaft tip 121 moves in the axial direction against the action of the compression spring 152. Upon inward movement, the clamping body 143 closes and the lead 110 is held securely immovable against axial writing pressure. Tightening body 143
In this case, the retraction movement in the axial direction of the contact application part 13
3 via a pressing insert 150 and a compression spring 152.

When a relatively long line or character is drawn without leaving the writing surface 200, the lead guide tube 103 overcomes the pressing force of the compression spring 152 and the axial braking force of the lead brake 132 and the sliding brake 134 to reach the shaft tip. 121 until reaching the inner stop or the leading edge 126 of the shaft tip 121
contacts the writing surface 200, thereby causing the lead guide tube 10 to
Slide it in until it is located within a horizontal plane with the tip of 3. The clamping sleeve 141 of the clamping device 104 can in this case be arranged stationary or axially movable in the shaft 102 .

FIG. 12 shows two alternative embodiments of the writing instrument 101 of the invention, in which the fall stop 135 is installed either on the shaft 102 (upper half of the figure) or on the shaft tip 121 (lower half of the figure). formed directly.

In this case, the sliding brake 134 is the core brake 13
2 or is made in one piece and acts directly on the wall of the sliding hole 124. The sliding brake partially projects radially from the insertion slide 131.

The writing instrument 101 is in a writing position, with the lead guide tube 103 and the lead 110 resting on the writing surface 200. The distance c is formed in this case from the tolerance distance b, the displacement distance a, and the already advanced writing or effective sliding distance of the insertion slide 131.
The drawing shows a refill 1 with a different shaft 102 and a closure 161 made as a conical hopper.
12, a stopper collar 146 formed on the shaft portion 145 of the tightening body 143, and the lower half of the drawing show the tightening sleeve 1.
41 is shown, and a clamping stop 140 is formed on its sliding conical surface 142 in the area in which rolling elements 147 come into contact. In the sliding hole 124 of the shaft tip 121, an insertion slide 131 with an inner contact extension 133 is arranged so as to be movable in the axial direction, together with the core guide tube 103 and the core brake 132 and the sliding brake 134. . The distance c is limited by the bottom stopper 122 and the end face of the insertion slide 131.

FIG. 13 again shows the two embodiments in the rest position, in which case in the upper half of the figure the stopper collar 146 is subsequently fitted onto the shaft 145 of the forceps-like clamping body and the shaft 102 is shown in FIG. It abuts against a fall stop 135 formed on a clamping sleeve 141 which is immovably arranged therein. In the lower half of the drawing, the end surface of the forceps-like clamping body 143 is in contact with the drop stopper 135, and this drop stopper is formed by the bottom surface of the notch 162 in the insert body ¹²⁵¹ . Insert body 125 ¹ is shaft tip 12
1 and has an O-ring as a sliding brake 134, which acts on the outer circumferential surface of a contact extension 133 arranged on the insertion slide 131. Core brake 132 and core guide tube 1
The end face of the insertion slide 131 that receives the slider 03 and the slide hole 1
24 and the bottom stop 122 forms in this case also a tolerance distance b, which distance b must in any case remain within a small range in order not to impair the reliable functioning of the writing instrument 101. Should.

The writing surface 200 is not in contact with the lead guide tube 103 and/or the lead 110 in the writing instrument rest position, and the forceps-like clamping body 143 or its stopper collar 146 is in contact with the fall stopper 135,
Therefore, the moving distance a is zero. The bore wall of the recess 162 also serves in this case to limit the radial opening distance of the clamping jaws of the clamping body 143.

According to FIG. 14, the writing instrument 101 has an insert 125 ¹¹ inside the shaft tip 121, on which a sliding brake 134 is formed directly, in part, by stamping and/or molding. . The sliding brake 134 in this case applies a radial pressure and an axial holding force or axial braking force to the contact application part 133 formed directly on the insertion slide 131 holding the core brake 132 and the core guide tube 103.
to act on. The moving distance a is also zero in this case. This is because the writing instrument is not in contact with the writing surface 200, and in this case, the forceps-like clamping body 143, which is not directly visible, or the stopper collar 148 disposed on the web 149 hits the fall stopper 135. This is because they are in contact with each other. The end face of the pressure insert 150, which is spring-loaded by the compression spring 152, also rests against the fall stop 135, so that no other axial pressure forces act on the insertion slide 131. The tolerance distance b is maintained by the action of a sliding brake 134.

Due to the action of the sliding brake 134, whatever the tolerance distance b between the bottom stop 122 and the end face of the insertion slide 131 is, it does not have any influence. This is because the insertion slide 131, and thus also the core guide tube 103, will be moved within this tolerance distance b when the sliding brake 134 is activated.
This is because there is no movement in the axial direction. If there is no sliding brake, the core guide tube 103 will move forward under its own weight. In this case, at the beginning of writing, the respective tolerance distance b results in a short "idling stroke" as an ineffective sliding distance, which is often felt unpleasant by the user of the writing instrument. Similarly, tightening body 1
This also occurs when the opening distance a of 43 is not limited to the minimum value. This restriction is achieved by drop stopper 135.

If the core guide tube 103 is manufactured without an insertion slide 131, it is possible, if necessary, to omit the forward axial end stop completely due to the action of the sliding brake. This is particularly advantageous when the core guide tube 103 is optionally designed to be exchangeable, for example with a core guide tube having a different core.

If the axial braking force of the sliding brake 134 is smaller than that of the core brake 132, the core 110
The sliding brake 1 is activated by the radial holding force of the core brake 132 during the forward movement of the insertion slide 131.
They are forced to move forward together by overcoming the axial braking force of 34.

Especially if it is desired that the core protrudes from the tip of the core guide tube 103, the sliding brake 134
Advantageously, the axial braking force of the core brake 132 is greater than the axial braking force of the core brake 132.
By doing so, during each forward movement the core guide tube 103 or the insertion slide 131 remains somewhat rearward, whereas the core is held back by the core brake 13.
It overcomes the axial braking force of 2 and moves further forward (or downward).

For this purpose, however, the entire tightening device 104 is spring-loaded, for example by means of a balance spring 106, as shown in FIG. It is advantageous, and in some cases necessary, that the axial biasing force of this balance spring 106 is also overcome. When the writing pressure is removed or when the writing instrument leaves the writing surface 200, the clamping device 104, together with the lead 110, adjusts the lead protrusion length (which is limited by the contact surface 163 and remains at the desired length). It slides forward by the pressing force of the balance spring 106 against the axial pressing force of the compression spring 152. In this case, the core brake 132
The axial braking force of must be overcome.

For example, if the contact surfaces 163 arranged on the clamping body 143 and on the pressure insert 150 come into contact with each other, the core guide tube 103 or the insertion slide 131 fixedly connected thereto will be affected by the axial pressing force of the balance spring 106. Forced to move forward until reaching rest position. This results in a core protrusion, i.e. a core section freely protruding from the core guide tube 103, the axial length of which can be chosen arbitrarily as required and is referenced by the mutual spacing of the contact surfaces 163. It is possible to confirm by
This protruding length of the core is usually between 0.5 and 1.2 mm.

If the contact surfaces 163 contact each other, the sliding brake 134 is applied to the core guide tube 103 or the insertion slide 1.
31 is fixed in a frictional manner, in which case the axial holding force of the sliding brake 134 is overcome, and the core guide tube 103 and the insertion slide 131 are attached together with the core 110 to the clamping body 143 or its stop collar 14.
6 comes into contact with the fall stopper 135 and the writing instrument 10
The movable parts of 1 move forward until they have reached their rest position.

The configuration of the sliding brake 134 can be selected arbitrarily. It may therefore also be a slitted, radially spring-elastic ring, a spring web or a radial addition, for example formed in the slide hole 124 of the shaft tip 121 or in the insertion slide 131. It may be a simple knot-shaped part.

[Brief explanation of the drawing]

The drawings show an embodiment of the writing instrument of the present invention,
FIG. 1 is a cross-sectional view of the front portion of one embodiment of the writing instrument of the present invention in the rest position, FIG. 2 is a cross-sectional view of another embodiment in the writing position, and FIG. 3 is a cross-sectional view of yet another embodiment. 4, 5, 6, and 7 are views showing modified embodiments of important parts of the present invention, respectively, and FIG. 8 is a sectional view of yet another embodiment of the writing instrument of the present invention. , FIG. 9 is a diagram showing still another embodiment of the writing instrument of the present invention having a tightening device, FIG.
0 shows a part of the writing instrument of FIG. 9 in a rest position, FIG. 11 shows the writing instrument of FIGS. 9 and 10 in a writing position, and FIG. 12 shows two further embodiments. FIG. 13 shows two further embodiments in the rest position; FIG. 14 shows a further embodiment. 1... Writing instrument, 2... Lead guide tube, 3... Casing or shaft, 4... Tightening device, 5... Lead,
7... Tightening sleeve, 8... Core storage section, 21...
Insertion slider, 22... Core brake, 23... Contact addition portion, 24... Centering cone, 25... Filler, 2
6... Sliding brake, 27... End stopper, 3
1... Shaft tip, 32... Center, 33...
...Top part, 35...Bottom stopper, 37...Additional part, 40...Tightening body, 41...End face, 42...End part, 43...Stopper collar, 44...Web, 4
5...Stopper collar, 46...Press stopper,
47...Rolling element, 48...Notch, 49...Contact cone, 51...Following core, 52...Replacement core, 60...
Compression spring, 61...Press insert, 62...Through hole, 63...Contact surface, 64...Spring stopper, 6
5... Guide portion, 66... Pressing slope, 67... Centering portion, 68... Pressing edge, 73... Sliding conical surface, 74... Opening, 75... Fixing ring, 76...
... Closing part, 77 ... Sliding slope, 78 ... Tightening sleeve, 79 ... Sliding sleeve, 92 ... Cleaning needle, 93 ... Retaining ring, 94 ... Clip, 9
6...Balance spring or compensation spring, 100...Paper, 101...Writing instrument, 102...Shaft, 1
03... Core guide tube, 104... Tightening device, 106
... Balance spring or compensation spring, 110 ... Core,
111...Following lead, 112...Replacement lead, 121...
Shaft tip, 122...Bottom stopper, 12
4...Slip hole, 125, 125 ¹ , 125 ¹¹ ...
Insert body, 131... Insertion slider, 132... Core brake, 133... Contact addition portion, 134... Sliding brake, 135... Fall stopper, 140... Tightening stopper, 141... Tightening sleeve, 142 …
... Sliding conical surface, 143 ... Clamping body, 145 ... Shaft portion, 146 ... Stopper collar, 147 ... Rolling element, 148 ... Stopper collar, 149 ... Web, 150 ... Pressing insert, 151 ... Pressing slope, 152... Compression spring, 153... Core storage section,
154...Eraser, 155...Retaining ring, 1
56...Cleaning needle, 157...Closing cap, 1
58...Clip, 159...Fixing ring, 16
3...Contact surface, 200...Writing surface.

Claims (1)

[Scope of Claims] 1. A writing instrument that automatically feeds a lead and automatically follows a subsequent lead during writing, which slides within the tip of the writing instrument in the axial direction and projects from the tip of the writing instrument. Core brake 22 and insertion slide 21
a core guide tube 2 equipped with a core guide tube 2, and at least a forceps-like clamping body 40 and a clamping stopper 7 that are opened in the radial direction.
2, 73, and a compression spring 60 disposed between the core guide tube and the clamping body and acting on both the core guide tube and the clamping body. In the type that prevents self-locking action from occurring between the body and the tightening stopper,
A forceps-shaped clamping body 40 has a web 44 and a stopper collar 45 on the end face 41 side, and a compression spring 60 is arranged inside the web 44 and the stopper collar 45, and the clamping body 40 and the core guide tube 2 and the compression spring 60 is connected directly or via a pressure insert 61 to the stopper collar 45.
, and the contact point between the compression spring 60 or the pressing insert 61 and the stopper collar 45 is formed so as to transmit the pressing force in the axial and radial directions to the clamping body 40. Writing implements. 2. The automatic lead feeding type writing instrument according to claim 1, wherein the pressing insert 61 is disposed between the compression spring 60 and the lead guide tube 2 inside the web 44 and the stopper collar 45. 3 Core guide tube 2, compression spring 60 or pressing insert 6
1 , and a contact surface 63 is arranged on a corresponding piece that cooperates with the contact portion to form a contact point.
The automatic lead-feeding writing instrument described in item 1 or 2. 4. The automatic device according to any one of claims 1 to 3, wherein the contact point between the compression spring 60 or the pressing insert 61 and the stopper collar 45 is formed so that no self-locking action occurs. Lead-feeding writing instrument. 5 The contact point is the compression spring 60 or the pressing insert 61
5. The automatic lead-feeding type writing instrument according to claim 4, wherein the pressure slope 66 is formed at the stopper collar 45, and the conical pressure stopper 46 is formed at the stopper collar 45. 6. The contact point is designed as a pressure edge 68 on the compression spring 60 or on the pressure insert 61 or on the stopper collar 45, in which case said pressure edge, in the rest position of the writing instrument, forms a conical surface of the corresponding piece in the area of the contact point. 6. An automatic lead-feeding writing instrument according to claim 4 or 5, which is configured to be operatively connected to the section. 7. The axial spring force and gravity of the compression spring 60 and the axially freely movable portion of the clamping device 4 are applied to the clamping body 40 in the radial direction via the contact points of the pressing stopper 46 and the pressing slope 66. The automatic lead feeding type writing instrument according to any one of claims 1 to 6, which is formed in a conical shape so as to be larger than the spreading force acting on the writing instrument. 8. The automatic lead-feeding writing instrument according to any one of claims 1 to 7, wherein the contact portion between the clamping body 40 and the clamping stopper is formed so that no self-locking action occurs. . 9 the abutment point is due to the rolling element 47 arranged in the cutout 48 of the clamping body 40 and the sliding conical surface 73 arranged in the clamping sleeves 7, 78 and the sliding sleeve 79; 9. Automatic lead-feeding writing instrument according to claim 8, formed by a contact cone 49 arranged on the outer surface of the holder and a contact edge 72 on the sliding sleeve 79. 10 Core guide tube 2 in shaft tip 31
or the contact surface 63 of the bottom stopper 35 and the compression spring 60 or the pressure insert 61
An insertion slide 21 disposed in the core guide tube 2 between the
and the axial length of the contact adding portion 23 is the same as that of the core guide tube 2.
The automatic lead feeding type writing instrument according to any one of claims 1 to 9, wherein the writing instrument and the compression spring 60 are always in direct or indirect working connection. 11 When the lead guide tube 2 is lowered onto the paper surface 100 and during writing, the compression spring 6 is
0 and the core brake 22 into the writing instrument 1 or its shaft tip 31, and in this case the radial expansion effect on the forceps-like clamping body 40 is eliminated, and at the same time the clamping A clamping action is produced in the radial direction of the body, and the clamping body 4
The automatic lead feeding type writing instrument according to any one of claims 1 to 10, wherein the axial tightening force for holding the lead 5 is greater than the axial holding force of the lead brake 22. . 12 When or after the core guide tube 2 separates from the paper surface 100, the bottom stopper 3 is moved within the shaft tip 31 under the action of the compression spring 60.
5, in which case the clamping body 40 is moved axially through the contact points by the action of the compression spring 60 and is opened radially, the core 5 then being moved radially open by the core brake 22. The automatic lead feeding type writing instrument according to any one of claims 1 to 11, which is held immovably by the axial holding force of and is conveyed from the clamping body 40 toward the tip of the shaft. . 13 The clamping sleeve is constructed as a sliding sleeve 79 that is axially movable in the housing 3 and the balance spring 96 is mounted on the sliding sleeve 79.
13. The automatic motor according to claim 1, wherein the sliding sleeve rests against the rear end and pushes the sliding sleeve forward towards a stop located on the casing 3 or on the shaft tip 31. Lead-feeding writing instrument. 14 The pressing force of the balance spring 96 is the compression spring 6
0 and all axially movable parts 2, 21,
22, 23, 25, 61, 40, 47, 79,
The automatic lead feeding type writing instrument according to claim 13, wherein the force is slightly greater than the force in the opposite direction in the axial direction. 15 A writing instrument with automatic lead feeding and automatic following of a subsequent lead during writing, which includes a lead brake 132 and an insertion slide that slides in the tip of the writing instrument in the axial direction and projects from the tip of the writing instrument. a core guide tube 103 with a child 131; and at least
A clamping device 104 consisting of a forceps-like clamping body 143 that opens in the radial direction and a clamping stopper 140
and a compression spring 152 disposed between the core guide tube and the clamping body and acting on both the core guide tube and the clamping body, in which case a self-locking action occurs between the clamping body and the clamping stopper. In this type, the forceps-like tightening body 143 has a web 149 and a stop collar 148 on the end face side, and a compression spring 152 is arranged inside the web 149 and the stop collar 148. and is operatively connected to the clamping body 143 and the core guide tube 103, and the compression spring 152 is connected directly or via a pressure insert 150 to the stopper collar 148,
The contact point between the compression spring 152 or the pressure insert 150 and the stopper collar 148 is configured to transmit an axial and radial pressing force to the clamping body 143 , so that the drop stopper 13
5 and has a sliding brake 134 for the core guide tube 103, the drop stopper 135 limits the axial movement distance a of the clamping body to release the clamping body 143, and the sliding brake 134 An automatic lead feeding type writing instrument characterized in that the writing instrument 101 immovably holds the lead guide tube 103 or the insertion slide 131 immovably connected to the lead guide tube in a non-functional rest position of the writing instrument 101. 16 Insert 1 with fall stopper 135 attached directly to or within the tip of the writing instrument
25, 125 ¹ , 125 ¹¹ . The automatic lead feeding type writing instrument according to claim 15 , which is arranged in 25, 125 1 , 125 11 . 17 The drop stopper 135 is attached to the tightening sleeve 141
or on the shaft 102 of the writing instrument, and is connected to the clamping body 143 via the clamping body shaft 145.
16. The automatic lead-feeding writing instrument according to claim 15, which cooperates with a stopper collar 146 coupled to a stopper collar 146. 18 a sliding brake 134 is arranged axially immovably within the writing instrument tip and the insert 125;
125 ¹ , 125 ¹¹ or axially retained by an insert 125 , 125 ¹ , 125 ¹¹ . Automatic lead-feeding writing instrument as described. 19 The sliding brake 134 is arranged on the core guide tube 103 or on the insertion slide 131 connected to the core guide tube, the outer circumferential surface of which protrudes at least partially in the radial direction. 1
The automatic lead-feeding writing instrument described in any one of Items 5 to 17. 20. The automatic lead feeding type writing instrument according to any one of claims 15 to 19, wherein the axial braking force of the sliding brake 134 is smaller than the axial braking force of the lead brake 132. 21. The automatic lead feeding type writing instrument according to any one of claims 15 to 19, wherein the axial braking force of the sliding brake 134 is greater than the axial braking force of the lead brake 132. 22 Tightening device 104 or tightening sleeve 14
22. An automatic lead-feeding writing instrument according to any one of claims 15 to 21, wherein 1 is spring-loaded by a compensation spring or balance spring 106. 23. The axial pressing force of the compensation spring or balance spring 106 is greater than the axial holding force of the sliding brake 134 and is also greater than the axial pressing force of the compression spring 152. Automatic lead-feeding writing instrument.