JPH05485U - Notch type writing instrument - Google Patents

Abstract

(57) [Summary] [Purpose] A knock-type writing instrument in which the engaging step portion of the clip and the engaging protrusion of the cam cylinder are locked so that the writing tip portion projects from the shaft tip opening. Can solve the problems of high cost, quality variations, etc.
Allows for improved usability. [Structure] An engagement step portion 13 is provided on a ball portion 11 of a clip fixed to a shaft cylinder 1, and a knock mechanism portion including a shaft cylinder cam cylinder 16, a knock rod 21 and a rotating cam member 19 is provided to rotate by a knocking operation. The cam member is positioned at the advancing / retreating position, and the engaging protrusion 17 is formed on the cam cylinder to form the engaging step portion 13.
Only when the cam barrel and the rotary cam member 19 are both in the forward movement position, they can be engaged and disengaged with each other and are positioned in the forward and backward movement positions.
The writing tip portion 32 of the writing body 30 arranged so as to interlock with it can be projected from the shaft tip opening 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 According to the present invention, the locking step provided on the clip and the engaging projection provided on the knock mechanism are locked and fixed with the writing tip protruding from the shaft tip opening, and the locking is released. Thus, the present invention relates to an improvement of a knock-type writing instrument in which the writing body is retracted by the elastic force of the coil spring so that the writing tip is immersed in the shaft.

[0002]

[Prior Art]

 There is a writing instrument that is designed so that the writing instrument is fixed to the chest pocket of the clothes while the writing part is projected from the tip of the shaft and the ink of the writing part does not stain the clothes. As an example, as shown in FIG. 4 and FIG. 5, an engaging portion 3 ′ is provided on the tip ball portion 2 ′ of the clip 1 ′, and a ball portion 2 is provided on the side surface of the shaft cylinder 4 ′ facing the engaging portion 3 ′. There is a window 5 "that allows" "to be retracted, and an engaging portion" 7 "is also provided on the side of the knock body 6", and the knock body 6 "is moved forward so that the tip writing portion 9" of the refill 8 " The engaging plate 3 "of the clip 1" and the engaging part 7 "of the knock body 6" are locked and fixed while protruding from 10 ", and the pressing plate 11" provided at the rear end of the clip 1 " When the tip of the clip 1 "is lifted in reverse by pushing down in the axial direction to release the locked state of the engaging part 3" of the ball 2 "and the engaging part 7" of the knock body 6 ". The refill 8 "and the knock body 6" are retracted by the spring 12 "so that the writing part 9" of the refill 8 "is immersed in the shaft. It has been made there. That is, when the writing portion 9 "is projected from the shaft tip opening 10", the engaging portion 3 "of the clip 1" and the engaging portion 7 "of the knock body 6" are locked to disable the use of the clip 1 ". As a result, the attachment to the chest pocket, etc. is prevented, and if the clip 1 "is forcibly lifted and attached to the pocket etc., the engagement part 3" of the clip 1 "and the knock body 6" are engaged. Since the locked state of the section 7 "will be canceled, the refill 8" will inevitably retreat by the spring 12 "and the writing section 9" will immerse into the inside of the season by the ink etc. of the writing section 9 ". This is to prevent the clothes from becoming dirty. Also known is a knock-type writing instrument that uses a knock mechanism composed of a cam barrel (usually integrated with a shaft barrel), a knock rod, and a rotating cam member so that the tip of the writing moves in and out of the tip of the shaft. However, it does not have the safety mechanism described above that does not stain clothes.

[0003]

[Problems to be solved by the device]

 By the way, in the above-mentioned conventional writing instrument, in order to cancel the locked state of the engaging portion 3'of the clip 1'and the engaging portion 7'of the knock body 6 ', the pressing plate portion 1 at the rear end of the clip 1' It is configured to lift the clip tip ball 2 "by pushing down 1" in the axial tube direction. With this structure, the load is repeatedly applied to the mounting base 13 "of the clip 1", so that the mounting base 13 "sags. Since there is a problem that it is easy to make the mounting base 13 ″ made of synthetic resin because of its strength, it is necessary to use, for example, a metal plate. Therefore, it is impossible to integrally mold the clip with the shaft cylinder, and the cost is increased due to the material cost and the assembly cost, and the quality of the clip depends on the mounting condition when mounting the clip on the shaft cylinder. There was a problem that there was variation in. The first object of the present invention is to solve such a problem. Further, in the above-described embodiment, the writing tip portion is projected and retracted from the shaft tip opening by pushing down the rear end of the knock and the clip, but a knock mechanism portion including a normal cam barrel, a knock rod and a rotating cam member is used. As described above, it is inconvenient to use and has little playability with respect to a writing tip that appears and disappears only with a knock. A second object of the present invention is to solve the problem.

[0004]

[Means for Solving the Problems]

 The knock-type writing instrument of the present invention devised to solve the above-mentioned problem has a ball portion formed with an engaging step portion at the tip of the clip fixed to the rear end base portion of the barrel, and is opposed to the clip. A cam cylinder with a slit formed on the side surface of the shaft cylinder, a cam groove inside the shaft cylinder, and an engagement protrusion on the outer circumference can be moved forward and backward by fitting the engagement protrusion into the slit. The knock rod and the rotating cam member, which have a cam portion that engages with the cam groove, are mounted in the cam barrel so that the shaft can move freely, and the rotating cam member rotates when the knock rod moves backward. While the knock mechanism is positioned in the advancing / retreating position, the writing body is biased rearward by a coil spring in a state where the rear end of the writing body is in contact with the front surface of the rotating cam member. The cam barrel engages with the engaging step of the clip ball with the writing tip protruding when stored. The rotation cam member is positioned at the forward position, and when the ball part of the clip is lifted to the outside of the shaft cylinder surface, the engagement protrusion disengages from the engagement step and the cam cylinder moves. This means that the writing tip is retracted so that the writing tip is immersed in the barrel.

[0005]

【Example】

 1 to 3 show an embodiment of the present invention. First, as shown in FIG. 1, a shaft cylinder 1 is made of resin, and an axial slit 4 is provided on a side surface thereof from a rear end opening edge to a required distance forward position, and a base portion 6 is projectingly provided on a rear end side surface portion of the slit 4. There is. Further, in front of the slit 4, a step portion 8 having slopes 9 is appropriately formed from both side walls. Further, the mounting portion 15 in which the rear end of the clip plate 14 is bent in a U-shape is inserted into the mounting groove (not shown) of the base portion 6 and is crimped, and the tip of the clip plate 14 is connected to the ball portion 11. The clip 10 is formed by providing a mounting groove (not shown) and crimping it. Further, a groove 12 into which an engagement projection 17 of a cam cylinder 16 described later is fitted is formed on the lower surface of the ball portion 11, and an engagement step portion 13 is provided at the rear end of the groove 12.

On the other hand, the writing body 30 is provided with an ink occlusion body in which ink is filled inside a shaft body having a writing tip portion 32 such as a ballpoint pen at the tip, and an ink guide core for guiding the ink to the writing tip portion 32 from there. The tail plug is fixed to the rear end. (Not shown) In addition, an outer surface step portion 31 is provided behind the writing tip portion 32, and an inner surface step portion 3 formed ahead of the inner hole portion 7 of the barrel 1 and the outer surface step portion 31 are formed. The writing body 30 is fitted into the inner hole portion 7 of the shaft cylinder 1 by urging the coil spring 33 between the two. By the way, the cursive body 30 is a water-based ballpoint pen cursive body in the present embodiment, but it may be an oil-based ballpoint pen, felt-tip pen, or mechanical pencil.

Further, the cam cylinder 16 has a so-called cam groove, which has a plurality of circumferential grooves and ribs and has a cam portion at its front end, is formed in the inner hole portion thereof, and the shaft cylinder 1 is formed at the outer peripheral portion thereof. An engaging protrusion 17 is formed which is fitted in the slit 4 provided from the rear of the, and has a step portion 18 at its tip. Further, a knock rod 21 having a cam portion that engages with the above-mentioned cam groove and a rotating cam member 19 are fitted in the cam barrel 16 so as to allow axial movement in the cam barrel, and rotate each time the knock rod 21 moves backward and forward. The cam member 19 engages with the front end cam portion of the cam groove while rotating by the indexing angle of the cam groove, and is positioned at the advance / retreat position. The knock mechanism portion including the cam barrel 16, the knock rod 21, and the rotary cam member 19 has the same structure as a well-known Kahn-type knock mechanism. Further, the knock rod 21 and the rotary cam member 19 are fitted to the cam barrel 16 so as to be positioned at the forward and backward positions, and the knock member 22 is fixed to the rear end of the knock rod 21 by appropriately projecting from the rear end of the shaft barrel 1. Has been done.

As described above, the cursive body 30 is inserted into the inner hole portion 7 of the shaft cylinder 1 with the coil spring 33 interposed, and the knock mechanism portion is provided with the engagement protrusion 17 of the cam cylinder 16 from the rear end of the shaft cylinder 1. The engaging projection 17 abuts on the slope 9 which is fitted and inserted in the slit 4 and is located substantially in the center of the slit 4, and the slit is elastically deformed by pressing to expand the engaging projection 17 in front of the stepped portion 8. It is locked to the surface and prevented from coming off. The rear end of the writing body 30 contacts the front surface of the rotary cam member 19. Further, when the rear end of the knock member 22 is knocked to advance the knock mechanism portion, the engaging projection 17 of the cam barrel 16 resists the elastic force of the clip 10 and pushes the ball portion 11 outwardly to the groove 12. When the rotary cam member 19 is fitted and engaged with the engagement step portion 13 and the rotary cam member 19 is positioned at the forward position, the writing tip portion 32 of the writing body 30 is appropriately projected from the shaft tip opening 2 of the barrel 1. ..

[0009]

[Action]

 The operation will be described below based on the above embodiment. First, from the state of FIG. 1, when the rear end of the knock member 22 is knocked to advance the knock mechanism portion, the engagement protrusion 17 of the cam barrel 16 is locked to the engagement step portion 13 of the ball portion 11 of the clip, When it further advances, the step portion 8 comes into contact with the step portion 5 at the tip of the slit 4 to prevent the cam cylinder 16 from advancing, and the rotating cam member 19 advances and rotates together with the knock rod 21 to be positioned at the advance position. As a result, the writing tip portion 32 of the writing body 30 appropriately protrudes from the shaft tip opening 2 to be in the writing state. The state is shown in FIG.

If the knocking of the knocking member 22 is repeated in this state, the cam cylinder 16 holds the position where the engagement projection 17 is locked to the engagement stepped portion 13 of the ball portion 11 and the writing tip 32 is the tip of the shaft. The appearance will be repeated from 2. (See Figure 3)

As shown in FIG. 2, even when the writing tip portion 32 is projected from the shaft tip opening 2, when the writing instrument is to be fixed to a chest pocket or the like, the engagement step portion 13 of the clip ball portion 11 and the cam are Since the engagement protrusion 17 of the tube 16 is locked, the use of the clip is hindered and the clip is prevented from being fixed to the chest pocket or the like. If it is forcibly fixed to the chest pocket or the like, the engagement state of the engagement stepped portion 13 of the clip ball portion 11 and the engagement protrusion 17 of the cam barrel 16 is canceled, so the writing body 30 is unavoidable. Is retracted by the restoring force of the coil spring 33, and the writing tip 32 is immersed in the barrel 1. Therefore, it is possible to prevent the writing tip portion 32 from being attached to the chest pocket or the like in a state where the writing tip portion 32 is kept protruding to stain the clothes.

In order to project the writing tip 32 from the shaft tip opening 2 again, the rear end of the knock member 22 may be knocked.

[0013]

[Effect of the device]

 The present invention is as described above, and when releasing the engagement state of the engaging step portion of the clip ball portion and the engagement protrusion of the cam barrel, the ball portion is pushed up only when the clip of the writing instrument is inserted into the chest pocket or the like. Therefore, only the clip ball part operates and the other parts of the clip do not receive any load, and the clip mounting base part does not sag as in the conventional example. Since it can be integrally formed, the cost can be reduced, and the problem of variation in quality due to the attachment of the clip to the shaft cylinder can be solved. In addition, since the writing tip can be projected and retracted only with a knock, it is easy to use and the structure is simple, so it can be provided at low cost. Furthermore, even if the writing tip is attached to the chest pocket with the writing tip protruding, the writing tip will be sunk in the barrel, which may cause stains on the clothes with ink or when the writing pencil is used as a mechanical pencil. Can prevent the risk of breaking the core or damaging the body.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a knock type writing instrument according to an embodiment of the present invention, showing a state in which a writing body is housed in a shaft, and a cam barrel and a rotary cam member are both positioned at a retracted position.

FIG. 2 is a vertical cross-sectional view showing a state in which a rear end is knocked and a writing front end is projected from a shaft front end.

FIG. 3 is a vertical cross-sectional view showing a state where the rear end is knocked from the state of FIG. 2 and the writing tip portion is retracted from the shaft tip opening.

FIG. 4 is a vertical half-sectional view showing a state in which a writing tip of a conventional knock-type writing instrument is projected from a shaft tip opening.

FIG. 5 is a vertical cross-sectional view showing a state in which a writing tip portion of a conventional knock-type writing instrument is immersed in a barrel.

[Explanation of symbols]

 1 Shaft Cylinder 2 Shaft Tip Port 3 Inner Diameter Step 4 Slit 5 Step 6 Base 7 Internal Hole 8 Step 9 Slope 10 Clip 11 Ball 12 Groove 13 Engage Step 14 Clip Plate 15 Mounting 16 Cam Tube 17 Engagement Joint protrusion 18 Step portion 19 Rotating cam member 20 Cam portion 21 Knock bar 22 Knock member 30 Writing material 31 External step portion 32 Writing tip portion 33 Coil spring 1 "clip 2" Ball portion 3 "Engaging portion 4" Shaft cylinder 5 " Window hole 6 ”Knock body 7” Engagement part 8 ”Refill 9” Writing part 10 ”Shaft tip port 11” Pressing plate part 12 ”Spring 13” Mounting base part

Claims (1)

[Claims for utility model registration] [Claim 1] A clip fixed to the rear end base of the shaft cylinder has a ball portion with an engaging step formed at the tip, and a slit is formed on the side surface of the shaft cylinder facing the clip. A cam cylinder having a cam groove in the inner diameter portion and an engaging projection on the outer peripheral portion is formed in the shaft cylinder, and the engaging projection is fitted in the slit to be positioned so as to be able to move forward and backward. In the cylinder, a knock rod having a cam portion that engages with the cam groove and a rotating cam member are fitted so that the shaft can move freely,
A knock mechanism section is formed in which the rotary cam member is positioned in the forward / backward position while the rotary cam member is rotated by the frontward and backward movement of the knock bar. It is biased backward by a spring and stored in the shaft cylinder, and with the writing tip of the writing body protruding, the engagement projection of the cam cylinder is locked to the engagement step of the clip ball and rotated. The cam member is positioned at the forward position, and when the ball portion of the clip is lifted outward from the shaft cylinder surface, the engagement projection is disengaged from the engagement step portion and the cam cylinder retracts, and the writing tip is the cylinder cylinder. A knock-type writing instrument characterized by being configured to be immersed in the interior.