JPH0712757B2 - Knock type writing instrument - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is based on a relative rotation operation of a barrel and a rotation tube.
The present invention relates to a knock-type writing instrument which is set in a use mode in which a lead feeding device is pushed down, and a lead is fed out by a knocking operation in the use mode.

[Conventional technology]

Conventionally, this type of knock-type writing instrument has been shown in FIGS. 4 to 6.

That is, the groove tube 1 has its tip end fitted into a substantially central portion of the shaft tube 2 and is integrally fixed thereto, and the core feeding device 4 is slid in the guiding passage 1a provided inside the groove tube 1. It is installed movably, and the lead-out device 4 is moved by the spring 3 into the groove tube 1
Is biased upwards against.

Furthermore, a guide portion 1b in the longitudinal direction (hereinafter referred to as the longitudinal direction) from the cap 7 to the writing portion 4a is formed in the groove tube 1, and the projection 6 formed on the lead feeding device 4 is guided by the guide portion 1b. Thus, the lead-out device 4 can move only in the longitudinal direction without rotating with respect to the groove tube 1.

Instead of the lead-out device 4, other writing members such as a ballpoint pen and a felt-tip pen may be used. In this case, it is necessary to provide the projection 6 at a predetermined position of these writing members.

Then, on the upper side of the groove tube 1, a cam cylinder 9 is mounted so as to be capable of relative rotational movement with the groove tube 1, and a cam slope 9 a thereof protrudes from the groove tube 1. By contacting the projection 6 in the state, the upward movement of the lead-out device 4 by the spring 3 is restricted.

It should be noted that the cam slope 9a is provided with a holding portion 9b for holding the projection 6 when the projection 6 is guided to the maximum downward, and on the upper side of the cam barrel 9, the holding surface 9b is provided on the outer peripheral surface in the longitudinal direction. A small-diameter cylindrical portion 8 having a guide groove 8a is provided.

Next, the small-diameter tubular portion 8 of the cam barrel 9 is provided with a tubular locking member 11 with the guide projection 12 inserted in the guide groove 8a, so that the two are integrated only when rotating. Work,
It operates independently in the longitudinal direction. The guide protrusion 12 is, as shown in FIG.
The tubular locking member 11 is formed by recessing a predetermined portion of the side surface portion.

Further, the upper portion of the tubular locking member 11 is a small diameter portion 13, the lower end of the small diameter portion 13 receives the upper end of the small diameter tubular portion 8 to restrict the upward movement of the cam barrel 9, and the small diameter portion 13 On the outer peripheral side surface, a mounting tube 14 for mounting the tubular locking member 11 on the upper end of the barrel 2 for holding the barrel locking member 11 on the barrel 2 is rotatably installed, and is rotated with the upper portion of the small diameter portion 13. The moving pipe 15 is integrated with the upper portion of the mounting pipe 14. The rotating tube 15
From the above, the cap 7 attached to the upper end portion of the small diameter tubular portion 8 is in a protruding state.

Next, a method of using this knock type writing instrument will be described. By rotating the rotating tube 15 with respect to the barrel 2, the rotating tube 15 is rotated.
Together with 15, the tubular locking member 11 rotates with respect to the mounting tube 14, that is, the shaft tube 2. And the guide protrusion 12
The cam barrel 9 also rotates with respect to the shaft barrel 2 because it is inserted into the guide groove 8a, and the cam slope 9a pushes the protrusion 6 downward along the guide portion 1b. Move downward against the bias.

By the downward movement of the lead-out device 4, the writing portion 4a is exposed from the lower end of the barrel 2, and the projection 6 is held by the holding portion 9b, which is the use mode shown in FIG. The usage mode is maintained by the projection 6 being held by the holding portion 9b.

When the cap 7 is knocked in this use mode, the cam barrel 9 moves downward via the small-diameter barrel portion 8. At this time, the cam barrel 9 operates independently of the tubular locking member 11 (rotating tube 15) by inserting the guide protrusion 12 into the guide groove 8a.

This downward movement of the cam barrel 9 causes the holding portion 9b to project into the projection 6.
Is pushed downward to move a part of the lead-out device 4 downward so as to feed out the lead 5 from the writing section 4a. In addition,
In the cam barrel 9, the space 16 formed above the groove pipe 1 has a longitudinal direction that allows a knock stroke (movement of the cam barrel 9) required to feed the lead 5 during a knocking operation. It is necessary to have a predetermined length.

Next, when the writing instrument is not used, the rotation tube 15 is rotated in the opposite direction to the above, and the cam cylinder 9 is rotated in the opposite direction via the cylindrical locking member 11 so that the projection is formed. 6 is
After being disengaged from the holding portion 9b, it moves upward along the guide portion 1b by the guide of the cam slope 9a and the bias of the spring 3, and the writing portion 4a as shown in FIG. It is set to the stored non-use mode.

[Problems to be Solved by the Invention]

However, as shown in FIG. 5, the conventional knock-type writing instrument has the same state as that in the use mode in the space portion 16 that allows the movement of the cam barrel 9 with the knock operation even in the non-use mode. In some cases, for example, the cap 7 of the writing instrument in the non-use mode, such as when it is inserted in the pocket, is inadvertently pressed to expose the writing portion 4a from the barrel 2, and the lead 5 is further extended. There was a problem that the core was broken.

Therefore, in the present invention, a knock-type writing instrument capable of performing knocking operation only in the use mode and preventing the knocking operation in the other modes to prevent careless drawing out of the writing instrument in the non-use mode is provided. The purpose is to provide.

[Means for Solving the Problems]

The present invention, in the above-mentioned knock-type writing instrument, uses a guide portion provided for guiding the protrusion of the lead-out device, and a position such that the guide portion can be inserted only when the use mode is set. Therefore, in the use mode in which the convex portion is formed on the inner peripheral surface of the cam barrel and the writing portion of the lead feeding device is exposed by the movement of the convex portion due to the rotation of the cam barrel, the convex portion is located above the guide portion. In the non-use mode in which the writing portion of the lead-out device is not exposed, the positional relationship between the convex portion and the guide portion is shifted so that the convex portion is substantially in contact with the upper end of the groove tube. It was made to become.

[Action]

Therefore, when the knocking operation is performed in the use mode, the convex portion of the cam tube will enter the guide portion of the groove tube, so that the cam tube that interlocks with the cap is formed between the upper end of the groove tube. It is possible to move the space portion in the direction of contracting, that is, downward, whereby the protrusion can be pushed down by the inclined surface of the cam and the lead feeding device can be operated to feed the lead from the writing portion.

Further, in the non-use mode, the positional relationship between the convex portion of the cam barrel and the guide portion of the groove tube is deviated, and the convex portion is substantially in contact with the upper end of the groove tube. When the operation is performed, the convex portion is locked to the upper end of the groove tube, so that the downward movement of the cam cylinder is restricted, and the core cannot be extended.

〔Example〕

 Embodiments of the present invention will be described with reference to the drawings.

1 to 3, 1 to 9b, 11 to 16 are the fourth
It is similar to that shown in FIGS. Reference numeral 10 denotes a convex portion 10 provided on the inner peripheral surface of the cam barrel 9 and above the holding portion 9b,
It is located in the space 16.

Here, when the rotating tube 15 is rotated with respect to the barrel 2 and the writing mode 4a of the lead-out device 4 is set to the use mode in which it is exposed from the lower end of the barrel 2, as shown in FIG. As shown, the convex portion 10 is located above the guide portion 1b.

Therefore, when the cap 7 is pressed in this use mode, the convex portion 10 enters the guide portion 1b,
The cam barrel 9 can move downward, and the holding portion 9b pushes the protrusion 6 downward to move the lead feeding device 4 downward, so that the lead 5 can be fed out.

Next, when the writing tube 4a is rotated in the opposite direction to the non-use mode in which the writing section 4a is housed in the barrel 2 as shown in FIG. 3B, the writing tube is not used. like,
The convex portion 10 is displaced from the upper portion of the guide portion 1b and is in a state of substantially contacting the upper end of the groove tube 1.

Therefore, even when the cap 7 is pressed in this non-use mode, the convex portion 10 is locked to the upper end of the groove tube 1, so that the cam cylinder 9 cannot move downward and the projection 6 is not formed. The cam slope 9a prevents the lead 5 from being pushed downward, so that the lead 5 is not fed by the lead feeding device 4.

〔The invention's effect〕

The present invention enables the knocking operation of the cap only in the use mode in which the writing portion is exposed due to the relative positional relationship between the convex portion provided on the cam barrel and the guide portion provided on the groove tube. Therefore, in the non-use mode in which the writing part of the lead feeding device is housed in the barrel, the convex part is locked to the upper end of the groove tube to disable the cap knocking operation, and the writing part is exposed and exposed when the writing instrument is not used. It is possible to prevent unnecessary extension of the lead.

[Brief description of drawings]

FIG. 1 is a sectional view showing a knock-type writing instrument of the present invention, FIG. 2 is a perspective view of a cam barrel, FIG. 3 is an explanatory view showing a positional relationship between a convex portion and a guide portion, and FIG. , (B) is a non-use mode, FIG. 4 is a sectional view showing a use mode of a conventional knock-type writing instrument, FIG. 5 is a cross-sectional view showing a non-use mode of the knock-type writing instrument of FIG. 4, and FIG. (a) is explanatory drawing which shows a core feeding device, a groove tube, a cam cylinder, and a rotating tube, (b) is sectional drawing along the II-II line of a cylindrical locking member. 1 ... Groove tube, 1a ... Guide passage 1b ... Guide part, 2 ... Shaft cylinder, 3 ... Spring, 4 ... Lead feeding device 4a ... Writing part, 5 ... Lead, 6 ... Protrusion, 7 ...... Cap 8 …… Small diameter cylinder part, 8a …… Guide groove 9 …… Cam cylinder, 9a …… Cam slope 9b …… Holding part, 10 …… Convex part 11 …… Cylinder locking member, 12 …… Guide Protrusion 13 …… Small diameter part, 14 …… Mounting tube 15 …… Rotating tube, 16 …… Space part

Claims (1)

[Claims] 1. A guide corresponding to a guide projection (12) provided on an inner peripheral surface of the rotating tube (15) by a relative rotating operation of the shaft tube (2) and the rotating tube (15). A cam cylinder (9) having a groove (8a) formed in the longitudinal direction from the cap (7) to the writing part (4a) is rotated relative to the shaft cylinder (2), and a cam slope (9a) thereof is formed. ), The protrusion (6) of the lead feeding device (4) in a state of protruding from the guide portion (1b) in the longitudinal direction of the groove tube (1) attached to the shaft tube (2) is pushed down, and the writing is performed. By exposing the part (4a) and knocking operation,
A knock-type writing instrument in which the cam barrel (9) moves in the longitudinal direction in a state of being independent of the rotating pipe (15) so that a lead is drawn out, wherein the inner peripheral surface of the cam barrel (9) is The convex portion (10) is provided only in the use mode in which the writing portion (4a) is exposed.
Are formed in such a positional relationship that they can enter the guide part (1b), and in the use mode, the projection (10) enters the guide part (1b) by a knock operation and the cam cylinder ( 9) so that it can move downward, and in the non-use mode in which the writing part (4a) is not exposed, the positional relationship between the convex part (10) and the guide part (1b) is shifted. A knock-type writing instrument characterized in that the convex portion (10) is locked to the upper end of the groove tube (1) so that a knocking operation cannot be performed.