JPH0628311Y2 - Knock type writing instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an improvement of a knock-type writing instrument in which a tip writing section is projected and retracted from a front end of a shaft cylinder by sliding a clip back and forth.

(Prior Art) Conventionally, a knock portion that protrudes from the tail plug is provided, and the knock portion is pushed in against the spring that springs the writing body inward, so that the tip of the writing body projects from the tip of the shaft. In addition, the knocking part is locked to the shaft cylinder, and the locking part is released by pressing the clip so that the writing body is retracted and housed in the shaft cylinder, or the locking part is interlocked with the pressing of the knocking. A large number of types have been proposed in which the cursive body is sequentially rotated and the cursive body appears and disappears accordingly.

(Problems to be solved by the invention) However, in the above-mentioned conventional one, the knock button projects from the rear part of the shaft cylinder, and the appearance is not good. Since the knock button is provided, the number of parts increases and the product cost increases. In addition, the structure in which the protruding / retracting mechanism of the tip writing portion is operated by a knock has a complicated structure and requires a long time for assembling, and similarly, an increase in cost is inevitable.

Therefore, this invention is to improve the drawbacks of the above-mentioned conventional ones. The minimum number of parts is to reduce the cost, facilitate the assembling, and have a simple structure so that the writing tip can be accurately retracted and retracted. It is the one to try.

(Means for Solving the Problem) Therefore, a clip that slides back and forth along a guide groove extending to the axial rear end edge of the shaft cylinder is provided, and a clip body integrated with this is housed in the shaft cylinder. Connect the front end to the cursive back end,
The elastic locking piece provided on the clip body can be engaged with the locking portion in the shaft cylinder, and the locking edge at the rear end of the clip body is fitted into the shaft cylinder of the tail plug. In addition, the writing body is a mechanical pencil that can project the lead core by pressing the rear end of the writing body, and the back and forth movement of the clip so that the rear end of the writing body can be pressed by the clip body. It was designed so that

(Operation) With the above configuration, when the clip is slid forward along the guide groove of the shaft cylinder at the time of writing, the clip body is disengaged from the shaft cylinder, and the clip body is attached to the inner wall on the other side of the shaft cylinder. While pushing against the spring, move the writing body forward against the spring, and the spring that locks the sliding of the clip springs the clip body integrated with the clip into engagement with the tail plug. Therefore, the retreat is prevented, and writing with a cursive body becomes possible.

When the clip is pressed against the side wall of the barrel in this state, the engagement with the tail plug is released, and the cursive body is accommodated in the barrel due to the spring of the spring. By sliding the clip, the writing tip can be projected and retracted, and the number of parts can be reduced as much as possible. Moreover, the writing pencil should be a mechanical pencil that pushes the rear end to push out the lead core. After the tip of the writing body is projected from the barrel, the clip is slightly moved forward and the rear end of the writing body is pressed, and the lead core is actuated by a chuck according to the consumption of the lead core. It can be made to project more successively.

(Example) This will be further described with reference to an example shown in the drawings. Fig. 1 ~
FIG. 3 shows a first embodiment of the present invention, in which (1) is a barrel, and a writing part (3) is provided at the tip in the barrel (1), and the writing is contained inside. A spring is inserted between the annular flange (16) provided at the front end portion of the writing body (2) and the front end of the inner wall of the barrel (1) to accommodate the body (2), and the elastic force causes the annular flange (16) to move. ) And push the cursive body (2) into the barrel (1).

A guide groove (12), which is a vertical groove extending to the rear end edge in the axial direction, is provided at the rear end of the shaft tube (1), and the leg portion (22) of the clip (4) is fitted into the guide groove (12). The clip (4) protruding outward along the shaft tube (1) along 12) can be slid back and forth. The clip (4) integrally forms a clip body (5) connected by the leg portion (22).

The clip body (5) is formed in a cylindrical shape so as to be housed in the shaft cylinder (1) and slidable back and forth, and if possible, the side wall is provided with a protrusion (14) slidably contacting the inner wall of the shaft cylinder (1). And clip body (4)
A slit (6) is formed from the rear end of the slit, and the other part divided by the slit (6) is configured as an elastic locking piece (7). The elastic locking piece (7) has a rounded tip, and this portion is formed on the inner wall of the barrel (1) slightly higher than the inner diameter of the rear end of the barrel (1) as shown in FIG. ) To form the locking part (8)
By this engagement, the writing body (2) which is retracted into the barrel (1) by the spring of the spring (15) is placed in the barrel (1) in a stored state. Engagement edge at the rear end of the clip body (5)
(9) is formed so that it can be engaged with the front end of the tail plug (10) when the writing body (2) described later is projected.

A tail plug (10) is fitted on the inner wall of the rear end of the barrel (1), and the tail plug (10)
The inner wall end edge (21) of the projection protrudes inward with a step from the inner wall of the barrel (1), and the rear end edge (9) of the clip body (5) is engaged with the end edge (21) as described above. Is. The guide groove (12) extending to the rear end of the barrel (1) is used for assembly and
Insert (5) into the barrel (1), put it in place, and then set the tail plug (10).
It is made by fitting. (18) is a step on the front end of the inner wall of the barrel (1), and when the writing tip (3) is protruding, the front end (1
It engages with (7) to prevent further protrusion, and (1
Reference numeral 9) is a protrusion provided on the inner side of the front end of the clip (4) for smoothly holding clothes or the like. (20) is the barrel
It is the front end opening of (1).

Since this first embodiment is constructed as described above, the leg portion (22) of the clip (4) which is inserted into the guide groove (12) slides forward in the guide groove (12) during writing. , Clip body with this
The elastic locking piece (7) of (5) elastically disengages smoothly from the stepped portion (23) of the locking portion (8) of the barrel (1) by the slit (6), and further, the locking portion (8) It is elastically abutted against the inner wall of the barrel (1) formed one step higher than the above), and thereby acts so as to press the clip body (5) toward the other side wall. In this case, the clip (4) is tilted on the outer surface of the barrel (1) with the protrusion (14) of the clip body (5) as a fulcrum, and the rear end of the clip body (5) is stronger. Will be pressed against the inner wall of the.

As the clip (4) slides forward, the clip body
The rear edge (9) of (5) passes through the inner wall (11) of the tail plug (10) and its edge
(21), it will be locked to the edge (21) by the above pressure contact, the front end of the clip body (5) abuts the rear end of the writing body (2) and moves it forward, The brush tip (3) is projected from the opening (20) of the tube (1). Also cursive (2)
The tip (17) of the shaft contacts the stepped portion (18) at the front end of the inner wall of the barrel (1) to prevent the protrusion thereof more than necessary, thereby allowing writing.

The cursive body (2) is stored in the barrel (1) as follows. That is, when the clip (4) is pressed close to the barrel (1), the front end edge (21) of the tail plug (10) and the rear end locking edge (9) of the clip body (5) are separated. The writing body (2) retracts due to the disengagement of the spring (15), and the elastic locking piece (7) of the clip body (5) is locked by the locking portion (8) of the inner wall of the barrel (1). The writing body (2) is housed in the barrel (1).

FIG. 4 shows a second embodiment of a conventional extruding mechanical pencil as a cursive body in which the lead core is projected from the tip by pressing the rear end, and the reference numerals in the drawing are the same parts as those in the first embodiment. Are indicated by the same reference numerals.

The cursive body (2) has a chuck for holding a lead core and a ring fitted to the chuck built in the tip portion (27) (not shown).
(2) Clip body with spring (25) between it and the rear end.
(5) Connect with the front end.

Since the position of the spring (15) is different from that of the first embodiment, and the clip body (5) is integrally connected to the writing body (2), the shaft cylinder
(1) Protrusion (14) that slides on the inner wall and step (29) on the inner wall of the barrel (1)
A spring (15) is inserted between them, and the elastic force pushes the writing body (2) into the barrel (1) through the clip body (5). (24) lid, (26) eraser, (28) cursive (2)
It is a collar body provided at the front end of the rear end portion. Also, the guide groove (12)
Even when the rear edge (9) of the clip body (5) engages with the edge (21) of the inner wall (11) of the tail plug (10), there is a slight gap between the clip body (5) and the front end (13). The lead core is extruded by using this gap.

The elastic locking piece (7) provided integrally with the clip body (5)
Is formed by slitting in three directions so as to be more elastic than the hollow slit (6) of the clip body (5), and the writing body (2) is fitted and fixed to the front end of the hollow slit (6). The structure of the other parts has the same structure as the first embodiment.

Since the second embodiment has the above-mentioned structure, when the clip (4) is slid forward along the guide groove (12) similarly to the first embodiment, the rear end edge of the clip body (5) ( 9) is the edge of the tail plug (10)
It will engage with (21), and writing is done in this state, but if the lead core becomes worn and writing becomes difficult, the clip
The (4) is slid slightly forward in the gap prepared in front of the guide groove, and the cursive body (2) is pushed forward.

The cursive body (2) has already protruded from the front end opening (20) of the barrel (1), and the barrel (1) and the front end (17) of the cursive body (2) are in contact with each other. The cursive body (2) cannot be pressed, and the rear end of the cursive body (2) presses the spring body (25) with the collar portion (28),
Although it will be inserted into the front end (27) of (2), a chuck for gripping the lead core is configured in this insertion part, and the ring fitted to the outer periphery grips the lead core and projects forward. Therefore, the lead core projects from the writing part (3) of the writing body (2), and then the ring is disengaged and released from the grip of the chuck.
It is locked on the tip fitting so that writing can be performed.

On the other hand, the clip (4) retreats due to the elastic force of the spring (25), and along with this, it fits into the chuck and the ring and returns to the original position when the lead core is gripped. Since the piece (7) is in front of the step (23), the clip body (5)
The rear edge (9) of the tail engages with the edge (21) of the tail plug (10), and the cursive body (2)
The projection is secured from the front end opening (20) of the barrel (1).

In this state, by pushing the clip (4) toward the barrel (1), the engagement between the rear edge (9) of the clip body (5) and the edge (21) of the tail plug (10) is released. The cursive body (extruded mechanical pencil) (2) can be housed in the barrel as in the first embodiment.

(Effect of the device) As described above, unlike the knock button, it does not project from the rear end of the barrel to make the appearance of the whole worse, the number of parts is minimized, the assembly is easy, and the cost is reduced. In addition, it is possible to reliably move the cursive body in and out, and when it is an extrusion mechanical pencil for cursive body, it has an excellent effect that the lead core can be further pushed out by a slight advance of the clip. Is.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of the first embodiment of the present invention when the writing body is stored, FIG. 2 shows the same when the writing body is projected, and FIG. 3 is a perspective view of a clip body and a tail plug. The drawing shows a second embodiment in which the cursive body is an extruding mechanical pencil, and FIG. 5 shows a perspective view of an essential part of FIG. 1 ... Shaft cylinder, 2 ... Writing body, 4 ... Clip, 5 ... Clip body, 6 ... Slit, 7 ... Elastic locking piece, 8 ...
Locking part, 9 ... locking edge, 10 ... tail plug, 11 ... inner wall,
12 …… Guide groove, 15,25 …… Spring, 16 ……
Ring collar, 24 ... Lid, 26 ... Eraser

Claims (2)

[Scope of utility model registration request] 1. A guide groove extending to an axial rear end edge is provided at a rear end portion of a shaft cylinder, and a clip body connected to a rear end of a writing body is accommodated in the shaft cylinder. A clip that projects outward and slides back and forth in the guide groove is provided, and an elastic locking piece that engages with a locking portion provided on the inner wall of the shaft cylinder when the writing body is stored in the shaft cylinder, and A knock-type writing instrument in which a locking edge of a rear end of a clip body can be engaged with an end edge of an inner wall of a tail plug fitted into an inner wall of a rear end of the shaft cylinder when the writing body projects from the shaft cylinder. 2. A mechanical pencil in which the lead core is projected by pressing the rear end of the writing body, and the clip can be moved back and forth in the guide groove.
Knock writing instrument described.