JPH0615736Y2 - Notch type pencil - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention is a state in which the tip of the writing unit of a mechanical pencil is freely retractable at the shaft tip opening, and the tip of the writing unit is projected from the tip opening. Then, the present invention relates to a knock-type mechanical pencil configured to engage and fix an engaging portion provided on a writing unit and an engaging portion provided on a clip.

(Prior Art) A small-diameter core protection pipe is usually projected at the tip of a mechanical pencil, and when it is not in use, the tip pipe may damage a person or be fastened to a chest pocket or the like. There was a problem that the tip pipe stuck into the clothes and broke the clothes. Therefore, when not in use, the tip is not immersed in the shaft, and in the case of writing, the tip can be protruded from the tip end of the shaft by the first knock operation, and then the lead can be extended by the second knock operation. The double knock type mechanical pencils described above are known from Japanese Utility Model Publication No. 60-191488 and Japanese Utility Model Publication No. 60-106781.

By the way, in the case of writing, such a mechanical pencil projects the tip of the writing unit from the tip of the shaft, and locks and locks the locking portion provided on the writing unit with a clip or a cylinder. When writing is finished, it is necessary to release the locked state and immerse the tip of the writing unit inside the shaft. As means for canceling the locked state, first, the clip plate is elastically deformed as shown in Japanese Utility Model Laid-Open No. Sho 60-191488, or No. Shokai No. Sho 60
-106781, the locking piece is pushed inward with the tip of the clip, or the actual opening is 61-77286.
As seen in the publication, there is means such as pushing the elastic rod inward with a knock button attached to the clip.

However, when the clip plate is repeatedly elastically deformed, it has a problem of strength, and when the locking piece or the elastic rod is pushed and displaced, the space inside the barrel is narrowed and the core case must be thinned. There is a problem that there are restrictions such as non-availability.

(Problems to be solved by the invention) Therefore, according to the invention, when the tip of the writing unit of the mechanical pencil is retracted into the shaft to release the locked state, a load is applied to the clip plate or the inside of the shaft is broken. The purpose of the present invention is to provide a knock-type mechanical pencil that does not cause restrictions on the mechanism.

(Means for Solving the Problems) A knock type mechanical pencil of the present invention devised to achieve the above object is provided with supporting pieces 6 which are bent inward in an arc shape on both side edge portions of a distal end thereof and at a rear position thereof. With respect to the clip plate 10 having the through hole 7 formed in the
Is provided with a boss 13 on the inner surface of the side wall 12 in the substantially central portion on the inner surface side, and a projection 15 having a locking portion 14 is further provided on the inner surface of the rear end of the clip ball portion 16. And the projection 15 is inserted into the through hole 7 so that the boss 13 serves as a fulcrum and the front and rear acupressure portions 11 and the locking portion 1 are inserted.
4 is installed so that it can be swung inward and outward alternately, a window portion 1 that is long in the axial direction is provided on the side surface of a shaft cylinder 5 that faces the clip plate 10, and a lead is inserted from the rear end. 20 is housed in a shaft cylinder, is movable in the axial direction along the window 1 on the side surface of the writing unit 20 of the mechanical pencil, and the tip of the writing unit 20 projects from the shaft tip opening 18. An engaging portion 19 that engages with the engaging portion 14 of the clip ball portion 16 is provided so as to project, and a writing unit 20 is provided.
Is urged backward by a spring, and the clip ball 16
By pressing the front end acupressure portion 11 inwardly, the rear end locking portion 14 is displaced outward, and the locked state with the locking portion 19 of the writing unit 20 can be released. Is.

(Embodiment) One embodiment of the present invention shown in FIGS. 1 to 3 is a window portion 1 which is long in the axial direction from a rear end opening edge to a required distance front position on a side surface.
And a clip mounting base 2 integrally projecting on the rear end side surface portion, and the clip mounting base 2 is provided with a groove portion 3 communicating with the window portion 1 and opened to the front and rear, and further outside the groove portion 3. A resin-made barrel 5 having a clip mounting groove 4 and a support piece 6 bent inward in an arc shape on both side edge portions of the tip and a through hole 7 slightly rearward thereof are provided at a rear end portion. Is provided with a mounting base portion 8 which is bent and is lowered one step toward the inner surface side, and the front end edge of the mounting base portion 8 is not provided as a locking portion 9 and the mounting base portion 8 is provided.
Is inserted into the clip mounting groove 4 and crimped, and is arranged at the outer position so as to face the window portion 1 of the shaft cylinder 5, and the clip plate 10
The acupressure portion 11 is provided on the outer surface of the front end, the boss 13 is provided on the inner surface of the side wall 12 at the substantially central portion on the inner surface side, and the projection 15 having the engaging portion 14 is provided on the inner surface of the rear end. The projection 15 is inserted into the support piece 6 of the clip plate 10 and the projection 15 is inserted into the through hole 7 of the clip plate 10 so that the front and rear acupressure parts 11 and the locking parts 1 are provided with respect to the clip plate 10 with the boss 13 as a fulcrum.
Clip ball part 16 that can swing 4 inward and outward alternately
When the tip core protection pipe 17 is housed in the shaft cylinder 5 so as to be movable back and forth, and the tip core protection pipe 17 projects from the shaft tip port 18, the locking portion 14 of the clip ball portion 16 and the window portion of the shaft barrel 5 are provided. 1, a writing unit 20 of a mechanical pencil integrally provided on the side surface with a projection-shaped engaging portion 19, an inner step (not shown) near the shaft tip end 18 of the barrel 5, and a writing instrument unit. 20 and a coil spring 22 that is interposed between the step portion 21 and the coil 21 to bias the writing unit 20 rearward. The writing unit 20 further includes the core protection pipe 17 described above. A base 23, a chuck 24 housed in the base 23 so as to be movable back and forth, and a chuck 24.
A fastener 25 that is fitted to the outer peripheral portion, a shaft pipe 26 that has the step portion 21 and the locking portion 19 and that fits the cap 23 to the front end portion thereof, and a rear end that is parallel to the side surface A stopper 29 composed of a flexible elastic piece 27 connected to the front end and a locking portion 28 protruding from the upper surface of the front end of the elastic piece 27 is integrally provided on the side surface, and the front end small diameter cylindrical portion 30 is attached to the shaft pipe 26.
The stopper 29 is inserted into the inside of the chuck 24 and integrally joined to the chuck 24, and the stopper 29 is arranged on a rear extension line of the locking projection 19 of the shaft pipe 26 so as to be movable back and forth with respect to the shaft pipe 26. A chuck spring 32 which is interposed between the case 31 and the shaft pipe 26 and biases the lead case 31 rearward, an eraser 33 which is fitted in a rear end inner hole of the lead case 31, and an eraser 33 are covered. And a knock cover 34 attached to the outer peripheral portion of the rear end of the lead case 31.

The clip plate 10 may be formed separately from the shaft cylinder 5 and attached to the shaft cylinder 5 as in the above-described embodiment, or may be integrally molded with the shaft cylinder 5 and is free.

(Operation) The operation will be described based on the above embodiment. The knock cover 34 of the writing unit 20 protruding from the rear end opening of the barrel 5 is pressed forward to compress the coil spring 22 and advance the writing unit 20 to advance the tip core protection pipe 17 of the mouthpiece 23.
Projecting from the shaft tip port 18 and the outer surface step 3 of the die 23
5 is brought into contact with the inner edge portion of the shaft tip end of the shaft cylinder 5, the locking portion 19 of the shaft pipe 26 of the writing unit 20 moves into the clip ball portion 16.
The engaging portion 14 is engaged and fixed. When the knock cover 34 is further knocked in this state, the chuck spring 32 is compressed, the lead case 31 is moved forward with respect to the shaft pipe 26, the chuck 24 is axially moved, and the lead is drawn out to enable writing.
When the writing is completed, the acupressure part 11 of the clip ball part 16 is pushed in the axial tube direction to rotate the boss 13 as a fulcrum to displace the locking part 14 to the outside so that the engagement state is canceled. The writing unit 20 moves backward until the engaging portion 28 of the stopper 29 of the lead case 31 comes into contact with the engaging portion 9 of the clip plate 10 by means of 22, and the lead protection pipe 1
7 sinks inside the barrel. Even when trying to fix the lead protection pipe 17 to the chest pocket or the like with the core protection pipe 17 protruding from the shaft tip end 18, the locking portion 14 of the clip ball portion 16 and the locking portion 19 of the shaft pipe 26 are engaged. Since the clip cannot be used, it is prevented from attaching to a chest pocket or the like. When the clip is forcibly opened and fixed to the chest pocket, the locking portion 14 of the clip ball portion 16 and the locking portion 19 of the shaft pipe 26 are locked.
Since the engagement has been released, the lead protection pipe 17 is retracted inside the barrel. Therefore, when it is fastened to a chest pocket or the like, damage to clothes by the core protection pipe 17 is prevented. In the state where the stopper 29 is fastened to the chest pocket or the like, the edge of the pocket and the front end of the stopper 29 of the lead case 31 face each other, and even if the knock cover 34 is accidentally knocked, the stopper 29 collides with the edge of the pocket. Since the forward movement is blocked, the lead protection pipe 17 does not project from the shaft tip opening 18, and the lead protection pipe 17 prevents damage to clothes.
In the above embodiment, the locking portion 28 of the stopper 29 of the core case 31 is engaged with the locking portion 9 of the clip plate 10 in the state in which the lead protection pipe 17 is retracted inside the shaft to set the retract limit. , The shaft cylinder 5 when the stopper 29 is not provided
The writing unit 2 is provided with a partition part in the middle of the window part 1
The engaging portion 19 of 0 may be abutted against each other and set as the retreat limit.

(Effect of the Invention) The present invention is as described above, and when not in use, the tip of the writing unit can be retracted inside the shaft, so that the tip of the writing unit eliminates problems such as injury to people and damage to clothes. . In particular, the present invention, as means for releasing the locked state in order to immerse the tip of the writing unit inside the shaft, has a clip ball portion at which the front and rear ends of the clip plate 10 are alternately swingable inward and outward. 16 is attached, the front end acupressure part 11 is pressed in the axial tube direction to displace the rear end locking part 14 in the direction away from the axial tube, so that the locked state is canceled. There is no need to worry that the load will not be applied to the shaft barrel, and the locking portion 14 of the clip ball portion 16 will not be displaced to the outside to push the member inward of the barrel. There are effects such as not being restricted.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a perspective view of an exploded state, FIG. 2 is a perspective view of an assembled state, and FIG. FIG. 1 ... Window part, 2 ... Clip mounting base, 3 ... Groove part, 4 ...
… Clip mounting groove, 5 …… Shaft cylinder, 6 …… Support piece, 7 ……
Through hole, 8 ... Mounting base, 9 ... Locking part, 10 ... Clip plate, 11 ... Shiatsu, 12 ... Side wall, 13 ... Boss,
14 ... Locking part, 15 ... Protrusion, 16 ... Clip ball part, 17 ... Core protection pipe, 18 ... Shaft tip port, 19 ...
… Locking part, 20 …… Writing unit, 21 …… Step part, 22
...... Coil spring, 23 …… Mouthpiece, 24 …… Chuck, 2
5 ... Fastener, 26 ... Shaft pipe, 27 ... Elastic piece,
28 ... Locking part, 29 ... Stopper, 30 ... Small diameter cylinder part, 31 ... Core case, 32 ... Chuck spring, 33 ...
… Eraser, 34 …… Knock cover, 35 …… Step section.

Claims (1)

[Scope of utility model registration request] 1. A clip plate 10 having arc-shaped support pieces 6 bent inward toward the inner surface and having a through hole 7 at the rear of the clip plate 10, and an acupressure portion 11 at the outer surface of the front end. The boss 13 is provided on the inner surface of the side wall 12 at the substantially central portion of the side, and the clip ball portion 16 formed by further providing the projection 15 having the locking portion 14 on the inner surface of the rear end is fitted into the support piece 6 by the boss 13. At the same time, the projection 15 is inserted into the through hole 7, and the front and rear acupressure portions 11 and the locking portion 14 are alternately mounted so as to be swingable inward and outward with the boss 13 as a fulcrum. A window portion 1 which is long in the axial direction is provided on the side surface of the cylinder 5, and a mechanical pencil writing unit 20 into which a lead is inserted from the rear end is housed in the axial cylinder, and the window portion 1 is formed on the side surface of the mechanical pencil writing unit 20. Can be moved in the axial direction along the Tip shaft tip opening of the unit 20 1
8, a locking portion 19 that engages with the locking portion 14 of the clip ball portion 16 is provided so as to project, and the writing unit 20 is biased rearward by a spring. By pressing 11 inward, the rear end locking portion 1
4 is displaced to the outside to lock the engaging portion 19 of the writing unit 20.
Knock type mechanical pencil, which is capable of releasing the engagement state with.