JPH0415519Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is a double type in which multiple writing elements are housed in one shaft case (shaft cylinder), and at least one of them is a knock-type sharp pencil element. It is related to writing instruments.

(Prior Art) A writing instrument is known that has a structure in which a plurality of writing elements are alternately projected and retracted from the tip of a shaft case using a cam mechanism.

That is, a lock-type mechanical pencil element and a ballpoint pen element are housed in one shaft case, and the mechanical pencil element and the ballpoint pen element are mounted on a guide tube 180 degrees apart from each other so as to be slidable in the axial direction. It is rotatable around these guide cylinders by a certain angle, and further includes a cylindrical cam that engages both writing elements and causes the writing elements to advance and retreat in the axial direction alternately as the writing elements rotate.

In this way, when the driven protrusion of the slider of either the sharp pencil element or the ballpoint pen element slides on the cam surface and engages with the tip of the cam surface, the cylindrical cam comes out from the opening at the tip of the shaft case. It makes the writing element stand out.

Of the structures in which the writing element is moved back and forth between the writing position and the storage position by the reciprocating rotation of a cylindrical cam, there are two main methods for providing a knocking action to the sharp pencil element.

One method is to move the cam itself back and forth and press a slider with the tip of the cam surface to give a knocking action to the sharp pencil element (for example, Japanese Patent Publication No. 57-50199), and the other method is to move the cam itself back and forth. Instead of forcing the sharp pencil element to move forward and backward, the knocking member attached to the groove on the inner surface of the cam gives a knocking action to the sharp pencil element (for example, the Japanese Patent Application Publication No. 1983-1999).
500290).

In either method of these writing instruments, the knock operation presses the entire sharp pencil element.

(Problems to be Solved by the Invention) The conventional structure in which the entire sharp pencil element is pressed to provide a knocking action has the following problems.

In other words, in a writing instrument in which a plurality of writing elements are housed in a single shaft case (shaft cylinder) that can move forward and backward, the tip of the writing element is naturally not fixed to the shaft case, and moreover, it is not connected to the writing element. A spring is provided to bias the slider against the cam surface.

Further, the lock-type mechanical pencil element is provided with a spring at its tip for returning the lead feed chuck.

Therefore, in the case of a stand-alone click-type sharp pencil, it is sufficient to apply a click action against the chuck return spring, so a light pressure is sufficient.
In a double-action writing instrument, a spring for biasing the sharp pencil element against the cam surface acts together with a spring for returning the chuck, and therefore, when the knob is operated, it is necessary to press against these two springs. For this reason, it is necessary to apply approximately twice as much pressing force as in the case of a single sharp pencil, resulting in the problem that the knock operation cannot be performed smoothly.

Furthermore, since the knocking operation is performed by engaging the tip of the cam or the tip of the knocking member with the slider, if the cylindrical cam or slider is made of synthetic resin, the engaged state is not necessarily perfect; However, there was a problem that the knob could not be operated stably.

This idea was made in view of the above points,
The lead of the sharp pencil element can be smoothly and reliably fed out with just a light pressure, and by simplifying the overall structure, parts costs, assembly costs, etc. can be reduced, and an inexpensive double-action writing instrument can be provided. This is what I am trying to do.

(Means for solving problems) Therefore, this idea was structured as follows.

a plurality of writing elements, at least one of which is a sharp pencil element; a shaft case that stores the writing elements; a slider attached to the writing element; A cap that is formed by fitting a guide tube into the guide tube, a cylindrical cam that is rotatably inserted into the guide tube, a knob member that is attached to the outer surface of the cylindrical cam and applies a knocking action to a sharp pencil element, and a cap that is inserted over the cylindrical cam. The sharp pencil element has a double structure in which an inner pipe is slidably inserted into an outer pipe, and the slider has an arrowhead-shaped driven protrusion on an upper side surface and is attached to at least the sharp pencil element. The slider is provided with a pipe insertion hole for inserting the inner pipe of the writing element and a fitting hole for inserting the outer pipe, and the guide tube is fitted to the rear end of the shaft case and guides the slider, as well as for driving the slider. A guide groove with an open side that allows the protrusion to protrude.
The guide grooves are bored 180 degrees apart, and below the guide grooves are provided coil spring receivers for urging the slider in the axial direction, and above the guide grooves are provided with rotation grooves for rotating the cylindrical cam. The cylindrical cam has a wedge-shaped notch member guide groove with a tapered lower surface that communicates with the guide groove. A through hole for inserting the pushing piece at the tip of the member and a sliding groove for the knob member opening from the through hole to the upper end are provided, and a locking member is provided on the inner surface of the upper end to fit into the groove for rotating the cylindrical cam of the guide tube. The knob member has a guide piece hanging from a side surface of a presser plate that presses the spring between the knob member and the guide tube, and the lower end of the guide piece is an inwardly bent presser piece. The piece is slidably fitted into the knob member sliding groove of the cylindrical cam. The tip of the guide piece is a push piece that is inserted through the through hole of the cylindrical cam and bent so as to come into contact with the upper end of the inner pipe of the writing element, and the guide piece of the knob member is inserted between the cylindrical cam and the cap. The writing element is moved alternately forward and backward between the writing position and the storage position by the rotation of the cylindrical cam, and when the sharp pencil element is in the writing position, the inside of the sharp pencil element is moved by the pressure of the knob member. The feature is that the pipe is punched and the core is drawn out.

(Example) Hereinafter, this invention will be described in detail based on an illustrative example.

Fig. 1 is a sectional view of the writing instrument of this invention, showing the sharp pencil element in the writing position and the ballpoint pen element in the storage position, Fig. 2 is a side view and perspective view of the slider of the ballpoint pen element, and Fig. 3
The figures are a side view and a plan view of the slider of the sharp pencil element, FIG. 4 is a perspective view, front view, and sectional view of the guide tube, FIG. 5 is a perspective view and sectional view of the cylindrical cam, and FIG. A perspective view, FIG. 7 is a plan view showing the engagement state of the slider and the cylindrical cam, and FIG.
The figure is an enlarged view of a main part showing an example of a sharp pencil element, and FIG. 9 is a developed explanatory view showing the movement of the writing element in relation to a cylindrical cam.

In the figure, 1 is a shaft case, 2 is a writing element, 3 is a slider for a ballpoint pen element, 4 is a slider for a sharp pencil element, 5 is a guide cylinder, 6 is a cylindrical cam, 7 is a knob member, 8 is a knob cap, 9
is a cap.

The shaft case 1 has a tapered tip and an opening 10 at the tip, and a writing element 2 is housed in the shaft case 1 with its writing tip facing the tip opening 10. The writing element 2 consists of a sharp pencil element 20 and a ballpoint pen element 21, with the sharpening pencil element 20 in the writing position and the ballpoint pen element 21 in the storage position.

The pencil element 20 may be of any construction as long as it incorporates a lead feeding mechanism 22 such as a chuck or a fastener.

In the embodiment, as shown in FIG.
A cap 26 is provided at the tip of the cap via a clamp 25, and a chuck 27 is inserted into the clamp 25.
An inner pipe 23 for storing a core is fixed to the rear end of this chuck 27 via a core guide 28. Clamp 2
5 and the core guide 28, a coil spring 29 is interposed between the inner pipe 2 and the core guide 28, and the inner pipe 2 is fixed to the core guide.
3 and chuck 27 are always urged toward the rear end. There is a sufficient distance between the clamp 25 and the lead guide 28 to allow the lead to be fed out with one knock operation. As will be described later, a slider 4 is provided on the outer pipe 24, and the inner pipe 23 protrudes through the slider 4.

The rear end of the writing element 2 is inserted into a guide groove of a guide cylinder 5 and connected to sliders 3 and 4 fitted so as to be slidable only in the axial direction.

A guide cylinder 5 is fixed to the rear opening of the shaft case 1 by fitting or screwing. A cylindrical cam 6 is rotatably fitted onto the guide cylinder 5, and the cylindrical cam 6 itself is rotated by a cap 9 fixed to the guide cylinder 5.

To supply lead to the sharp pencil element 20, the outer pipe 24 is molded in two parts, which are detachably connected, and the shaft case 1 is attached to the guide cylinder 5.
Alternatively, the shaft case 1 itself may be molded separately and connected in a detachable manner.

Next, each part will be explained.

As shown in FIG. 2, the ballpoint pen element slider 3 includes an insertion portion 30, a driven protrusion 31, and a sliding portion 3.
It is composed of 2. The driven protrusion 31 is formed in the shape of an arrowhead and slides along the cam surface of the cylindrical cam 6 as described later. Therefore, it is preferable that the driven protrusion 31 does not protrude outward beyond the side surface of the cylindrical cam 6 when assembled, but is formed substantially on the same plane or on the inner side thereof. Sliding part 3
2 is inserted inside the cylindrical cam 6, and this sliding portion 3
2 is for smooth sliding of the driven protrusion 31 with the cam surface, and can be omitted as appropriate.

Further, a notch engaging portion 33 is provided at the tip of the driven projection 31. By providing this notch engaging portion 33, the slider 3
When it slides on the cam 6 and reaches the top of the cam surface, it engages with the tip of the cam and is positioned.

The insertion portion 30 is connected to the ballpoint pen element 21 by being inserted thereinto, and is further connected to the ballpoint pen element 2 by inserting it into the ballpoint pen element 21.
By rotating the coil spring 34 in the slider 1, the slider 3 is always biased in the direction of the axis of the guide tube 5 when the slider 3 is inserted into the guide tube 5.

FIG. 3 shows a slider 4 that attaches to the sharpening pencil element.

The slider 4 has a substantially cylindrical shape with a part of its upper surface cut out in the shape of an arrowhead to form a driven protrusion 40. A fitting hole 42 for the large-diameter outer pipe 24 is provided, and the inner pipe insertion hole 41 and the fitting hole 42 are connected to each other by a locking step 43.

Furthermore, a notch engaging portion 44 is provided at the tip of the driven projection 40. By providing this notch engaging portion 44, when the slider 4 slides on the cam 6 and reaches the apex of the cam surface, similarly to the slider 3, the slider 4 engages with the tip of the cam and is positioned.

The upper end of the inner pipe 23 penetrates the insertion hole 41 and protrudes, but the head of the outer pipe 24 penetrates the insertion hole 4.
2, and is locked and connected to the locking stepped portion 43. Furthermore, when the slider 4 is installed in the guide tube 5, the coil spring 45 is wound around the outer pipe 24, so that the slider 4 is always biased in the direction of the axis of the guide tube 5.

The guide tube 5 is shown in FIG. The guide tube 5 is made of synthetic resin and has a cylindrical shape, and the slider 3,
The guide grooves 50 and 51 that guide 4 in the axial direction are 180 mm.
They are drilled at intervals and diametrically opposed to each other. The ballpoint pen element 21 and its slider 3 are fitted into the guide groove 50, and the sharp pencil element 20 and its slider 4 are fitted into the guide groove 51. In the embodiment, the guide groove 51 is formed larger than the guide groove 50, and the guide grooves 50 and 51 have grooves 52 and 52 for protruding the driven protrusions 31 and 40 of the sliders 3 and 4, respectively.
53 are provided.

Further, below the guide grooves 50, 51, receiving portions 54, 55 are provided which have a reduced diameter and lock the lower ends of the coil springs 34, 45. coil spring 34,
The upper end of 45 contacts the lower surface of sliders 3 and 4,
Since the lower end is supported by the receiving parts 54 and 55,
The writing element 2 connected to the slider is always urged in the direction of the axial head of the guide tube 5.

A flange 56 is protruded from the outer periphery of the lower end of the guide tube 5, and the rear part of the shaft case 1 comes into contact with this flange 56 to ensure reliable connection. Furthermore, a cylindrical cam rotation groove 57 is provided in the upper part of the guide cylinder 5. This rotation groove 57 is for fitting an engaging piece protruding inside the upper surface of the cylindrical cam 6 and horizontally rotating the cylindrical cam 6, and does not necessarily need to be provided over the entire circumference.

A knob member guide groove 58 is formed on the side surface of the guide cylinder 5. The knob member guide groove 58 is approximately wedge-shaped, and its upper surface is horizontal, that is, perpendicular to the axial direction, but its lower surface is tapered.

The upper end 58a of the guide groove 58 communicates with the guide groove 51, and when the sharp pencil element 20 is advanced to the writing position by the slider 4, the upper end of the inner pipe 23 penetrating from the slider 4 communicates with the guide groove 51. located slightly below the upper end 58a of the
It is configured to be pressed by a pressing piece of the knob member 7. On the other hand, the lower end 58b of the guide groove 58 communicates with the guide groove 50, and if its height (width) is made almost the same as the length of one notch, the cylindrical cam 6 can be rotated while the notch member 7 is pressed down. Even in this case, the lower end of the knob member 7 is always connected to the inner pipe 20 of the sharp pencil element 20 by the guide groove 58.
can be guided upwards.

Next, the configuration of the cylindrical cam 6 will be explained based on FIG. 5.

The lower surface of the cylindrical cam 6 is cut diagonally to the shaft.
Cam surfaces 60 and 61 are formed on the left and right sides, and the upper ends of the cam surfaces 60 and 61 are connected by a flat portion 62. The driven protrusions 31 and 40 of the sliders 3 and 4 slide on these cam surfaces 60 and 61.

A through hole 63 is bored in the side surface of the cylindrical cam 6 on the same axis as the tips of the cams 60 and 61, and a through hole 63 is formed in the outer surface of the cylindrical cam 6, continuing from the through hole 63 and opening at the upper end. A knob member sliding groove 64 is provided perpendicular to the axial direction. The sliding groove 64 is a guide groove into which the knob member 7 is fitted and slid. The through hole 63 is formed to have a size sufficient to allow the pushing piece of the knock member 7 to pass therethrough and to provide the knocking action.

Furthermore, an engaging piece 65 that is fitted into the rotation groove 57 of the guide cylinder 5 is provided protrudingly provided on the inner surface of the upper end of the cylindrical cam 6 . This engagement piece 65 is the rotation groove 5 of the guide cylinder 5.
7, the cylindrical cam 6 always rotates horizontally with respect to the axial direction, and the cylindrical cam 6 itself does not slide.

FIG. 6 shows an example of the knob member 7. As shown in FIG. In the embodiment, the knob member 7 includes a guide piece 71 hanging integrally from the side surface of the spring holding plate 70, and a push piece 72 bent at 90 degrees at the lower end of the guide piece 71.
The lock cap 8 is disposed integrally with the spring press plate 70 or simply in contact with the spring press plate 70. Spring holding plate 70
A coil spring 75 is disposed between the lower surface of the guide cylinder 5 and the upper surface of the guide cylinder 5, and constantly biases the knob member 7 in the axial direction.

The spring holding plate 70 is formed to be the same as or slightly smaller than the guide tube 5, and the guide piece 71 is slidably fitted into the sliding groove 64 of the cylindrical cam 6. is configured to abut against the upper end of the through hole 63.

The knob cap 8 is formed into a convex shape by a locking part 80 and a protruding part 81. The locking part 80 is the cap 9
The protruding portion 81 is in contact with the lower surface of the upper plate, and protrudes from the upper end of the cap 9 by a length sufficient to form a notch.
The protrusion 81 may be formed into a cylindrical shape and provided with an eraser.

The cap 9 has a clip on its side (not shown), is fitted on the outside of the cylindrical cam 6, and its lower end is slidably fitted to the upper end of the shaft case 1. An upper plate 90 of the head of the cap 9 is provided with a hole 91 into which the protrusion 81 of the knock cap 8 is inserted. Locking part 80 of lock cap 8
is in contact with the lower surface of the upper plate 90, and the protrusion 81 protrudes from the hole 91. When the knob cap 8 is pressed in the axial direction against the coil spring 75, the knob member 7 is pushed down, and the sharp pencil element 20 is pressed down.
The knocking operation is performed by contacting the inner pipe 23.

Next, a manner of use in which the sharp pencil element 20 and the ballpoint pen element 21 are moved back and forth to the writing position or storage position will be described based on FIGS. 7 and 9.

FIG. 9A shows a state in which the sharp pencil element 20 and the ballpoint pen element 21 are housed in the shaft case 1. In this state, the slides 3 and 4 are fitted into the guide grooves 50 and 51 of the guide cylinder 5.
are brought into contact with the cam surfaces 60, 61 at substantially intermediate positions by the pressing force of the coil springs 34, 45, respectively.

First, in order to advance the sharp pencil element 20 to the writing position, the cap 9 is rotated, that is, the cylindrical cam 6 fixed thereto is rotated to the positions shown in FIGS. 7A and 9B. When the cylindrical cam 6 is rotated, the inclined surface of the driven protrusion 40 of the slider 4 connected to the sharp pencil element 20 changes to the cam surface 60.
It descends while sliding, and stops when the tip of the cam surface engages with the notch engaging portion 44. At this time, the push piece 72 of the knob member 7 is guided by the knob member guide groove 58 of the guide tube 5, and the sharp pencil element 2
0 is guided above the inner pipe 23, and the preparation for the knock operation is completed.

On the other hand, the inclined surface of the driven protrusion 31 of the slider 3 connected to the ballpoint pen element 21 is the cam surface 61.
The upper surface of the sliding portion 32 of the slider 3 comes into contact with the upper surface of the guide groove 50 just before reaching the flat portion 62, so that the slider 3 is moved away from the cam surface 61 and positioned below the flat portion 62. I am forced to do it.

In this way, when the sharp pencil element 20 is advanced to the writing position and the ballpoint pen element 21 is retreated to the storage position, the knob member 7 is pressed against the coil spring 75.
is urged in the direction of the shaft head by the lock cap 8.
stands out. Therefore, when the knock cap 8 is pressed, the push piece 72 of the knock member 7 comes into contact with the inner pipe 23 of the sharp pencil element 20, causing the inner pipe 23 to move, thereby performing the knock operation. At this time, the outer pipe 24 is connected to the coil spring 4.
5 to the cam surface, the knocking operation requires simply pressing the inner pipe 23 against the coil spring 29 of the lead feeding mechanism 22 in the sharp pencil element 20.

One of the features of this invention is that the knocking operation is performed by pressing the inner pipe 23 of the sharp pencil element 20, which is a double pipe, instead of moving the entire sharp pencil element 20 forward and backward.

Next, in order to advance the ballpoint pen element 21 to the writing position, the cylindrical cam 6 may be rotated 180 degrees. The manner in which the mechanical pencil element 20 and the ballpoint pen element 21 move back and forth is clear from the above description, and therefore will be omitted for the sake of brevity. When the ballpoint pen element 21 is in the writing position, there is a gap between the top surface of the slider 3 and the pusher piece 72 of the knob member 7, so even if the knob member 7 moves, it will not come into contact with the slider 3. .

In the above embodiments, one writing element is a sharp pencil element and the other writing element is a ballpoint pen element, but both may be a knob-type mechanical pencil or a felt-tip pen element may be used instead of the ballpoint pen element.

Although the cylindrical cam 6 is designed to be able to rotate 180 degrees back and forth, if the guide groove 58 of the guide tube 5 is formed on the opposite side, it will be possible to rotate the cylindrical cam 6 360 degrees. Writing elements can be advanced or retreated.

(Effects of the invention) Since this invention is configured as described above, it can produce the following specific effects.

(1) By rotating the cap 2, the writing element can be advanced and retreated alternately between the writing position and the storage position, and since both writing elements can be stored in the shaft case, the cap of the sharp pencil element will not be damaged. It is also safe to put in your pocket.

(2) The sharp pencil element has a double pipe structure, with the outer pipe that fixes the slider and the inner pipe that houses the core and provides the knocking action separated.
The notch action that lets out the core fixes the outer pipe,
Since you only need to press the inner pipe, you can knock it by pressing lightly.

(3) Furthermore, the knob operation for feeding out the lead is not performed by the movement of a cylindrical cam, but is performed by pressing a separately provided knob member, so it is reliable.

(4) Furthermore, since the number of parts is small, material costs and assembly man-hours can be reduced, making it possible to provide a trouble-free and inexpensive multi-action writing instrument.

(5) The guide piece of the knob member is slidably fitted onto the outer surface of the cylindrical cam and is held between the cap and the knob, so that it does not deform inward and remains straight when the knob is operated. It can be pressed immediately.
Therefore, it is possible to reliably knock the lead and to smoothly feed out the lead.

[Brief explanation of drawings]

The drawings show an embodiment of the invention, and FIG. 1 shows the knock-type mechanical pencil element in the writing position;
A cross-sectional view of the ballpoint pen element in the storage position, Figure 2 shows the slider for the ballpoint pen element, Figure 2A is a front perspective view of the slider, Figure 2B is also a side view, and Figure 3 shows the slider for the sharpener element. 3A is a side view, FIG. 3B is a plan view, and FIG. 4 is a guide tube, FIG. 4A is a front perspective view, FIG. 4B is a side view, Figure 4C is a sectional view, Figure 5A is a perspective view of the cylindrical cam, Figure 5B is a sectional view, and Figure 6 is a perspective view of the knob member.
Figure 7 is a sectional view of the main part showing the relationship between the writing element and the cylindrical cam, Figure 7A shows the sharp pencil element in the writing position, and Figure 7B shows the ballpoint pen element in the storage position. FIG. 8 is a sectional view of a main part showing an example of a sharp pencil element, and FIG.
The figure is a developed explanatory view showing the movement of the slider in relation to the cylindrical cam. 1 is a shaft case, 2 is a writing element, 3 is a slider for a ballpoint pen element, 4 is a slider for a sharp pencil element, 5 is a guide tube, 6 is a cylindrical cam, 7 is a knob member, 8 is a knob cap, 9 is a cap, 10 is a an opening, 20 a sharp pencil element;
21 is a ballpoint pen element, 22 is a lead feeding mechanism,
23 is an inner pipe, 23 is an outer pipe, 25 is a clamp, 26 is a base, 27 is a chuck, 28 is a core guide, 29 is a coil spring, 30 is an insertion part, 31 is a driven projection, 32 is a sliding part, 33 is a notch engagement portion, 34
40 is a coil spring, 40 is a driven projection, 41 is an inner pipe insertion hole, 42 is an outer pipe insertion hole, 43 is a locking step, 44 is a notched engagement portion, 45 is a coil spring, 5
0, 51 are guide grooves, 52, 53 are cut grooves, 54,
55 is a receiving part, 56 is a flange part, 57 is a cylindrical cam rotation groove, 58 is a knob member guide groove, 60, 61 are cam surfaces, 62 is a flat part, 63 is a through hole, 64 is a knob member sliding groove, 65 is an engagement piece, 70 is a spring holding plate, 71
72 is a guide piece, 80 is a locking portion, 81 is a protruding portion, 90 is an upper plate, and 91 is a hole.

Claims (1)

[Claims for Utility Model Registration] A plurality of writing elements, at least one of which is a sharp pencil element, a shaft case that houses the writing elements, a slider attached to the writing element, and a slider capable of sliding in the axial direction. a cylindrical cam rotatably inserted into the guide cylinder; a knob member attached to the outer surface of the cylindrical cam to provide a knocking action to the sharp pencil element; The sharp pencil element has a double structure in which an inner pipe is slidably inserted into an outer pipe, and the slider has an arrowhead-shaped driven protrusion on the upper side surface. At least the slider attached to the sharp pencil element is provided with a pipe insertion hole for inserting the inner pipe of the writing element and a fitting hole for fitting the outer pipe, and the guide tube is fitted to the rear end of the shaft case and guides the slider. At the same time, a guide groove with an open side from which the driven protrusion of the slider protrudes is provided.
They are bored 180 degrees apart, and below the guide grooves are provided coil spring receivers that bias the slider in the axial direction, and above the guide grooves are provided with rotation grooves that rotate the cylindrical cam, and on the sides are the guide grooves. A wedge-shaped notch member guide groove is formed in communication with the groove and the lower surface is tapered. A through hole into which the pushing piece at the tip of the guide tube is inserted, and a sliding groove for the knob member opening from the through hole to the upper end, and an engagement fitting that fits into the groove for rotating the cylindrical cam of the guide cylinder on the inner surface of the upper end. The knob member has a guide piece that is slidably fitted in the knob member sliding groove of the cylindrical cam hanging from a side surface of a presser plate that presses the spring between the knob member and the guide cylinder, The tip of the guide piece is a push piece that is bent so as to be inserted through the through hole of the cylindrical cam and comes into contact with the upper end of the inner pipe of the writing element, and the guide piece of the knob member is inserted between the cylindrical cam and the cap. The writing element is moved alternately forward and backward between the writing position and the storage position by the rotation of the cylindrical cam, and when the sharp pencil element is in the writing position, the inside of the sharp pencil element is moved by the pressure of the knob member. A double writing instrument characterized by having a pipe that is tapped and a lead drawn out.