JPS5842152Y2 - writing implements - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement in a writing instrument in which the protrusion of the lead can be selectively carried out by the knocking action of the inner cylinder as well as the knocking action of the knocking part at the rear end.

In conventional knock-type writing instruments, the protrusion of the lead was performed by the knocking action of a knocking portion provided at the rear end.

Therefore, when a new protrusion of the lead is required during writing, it is necessary to interrupt writing and change the grip of the outer cylinder before performing a knocking operation.

This invention solves the above-mentioned drawbacks and provides a writing instrument in which the protrusion of the lead can be performed either at the knocking part or by the knocking action, and in addition, the knocking action can be easily performed without changing the grip of the outer barrel during writing. The purpose is to

An embodiment of this invention will be described below with reference to the drawings.

As shown in the first figure, the outer cylinder 1 for gripping has a cap 3 for protecting the core which is removably fitted to the tip thereof and provided with a centering foot holding mechanism 2, and a cap 3 fitted to the rear end thereof. A top screw 4 and an inner cylinder 5 slidably housed inside the top screw 4 are arranged.

The inner cylinder 5 is urged in the forward direction by a first elastic body 6 that is landed between the rear end and the crown screw 4, and the inner wall step 1a near the tip of the outer cylinder 1 Sliding in the forward direction is regulated by the front side of the outer cylinder 1, and the front side thereof projects outward from the tip of the outer cylinder 1. A knock groove 5a for fingertip knocking is formed in a part of the outer circumference of this projection.

A tip 7 is fitted to the tip of the inner cylinder 1, and a core pipe 8 slidable in the axial direction is housed inside the tip.

A core feeding mechanism 9 is provided at the tip of the core pipe 8;
A knock part 10 is provided at the rear end.

The lead feeding mechanism 9 includes a node chuck 11 fitted to the core pipe 8, a chuck clamping pipe 12 fitted externally to the head of this lead chuck 11, and this chuck clamping contacting the rear end of the pipe 12. , the chuck is tightened by a sleeve 13 that restricts the movement of the tube 12 in the backward direction, and this sleeve 13.
A second elastic body 14 is attached between the rear end and the inner cylinder 5, and a third elastic body is attached between the sleeve 13 and the core pipe 8.
An elastic body 15 is provided.

Further, the knock part 10 is fitted to the rear end of the core pipe 8,
A knock holder 16 having a cushion interval A between it and the top screw 4, a knock cap 17 removably fitted to the knock holder 16, and an eraser provided at the rear end of the knock holder 16. 18.

Here, the elastic force of the first to third elastic bodies is the largest in the third elastic body 15, and then decreases in the order of the first elastic body 6 and the second elastic body 14.

The cap 3 for protecting the core is attached to the outer cylinder 1 as shown in the first diagram.
The cap body 19 has a cylindrical shape having approximately the same diameter as the cap body 19, and the centering foot holding mechanism 2 provided at the rear end of the cap body 19.

The cap body 19 has a knock step portion 19 on its inner wall that engages with the knock groove 5a of the fingertip of the inner cylinder 5.
a is provided, and by attaching the cap, the inner cylinder 5
It is formed so that it can be knocked.

Further, the centering and foot holding mechanism 2 is provided with an adjusting section 2 screwed onto the rear end of the cap body 19 so as to be able to move in the axial direction.
0, a base abutting member 22 that comes into contact with the core 21, and a fourth elastic body that is elastically attached between this base abutting member 22 and the adjustment section 20 and integrally locks the base abutting member at one end. 23.

Next, the operation (2) of this invention will be explained.

A feature of the operation of this device is that there are two methods for protruding the lead 21 during or during writing.

The first means is to perform a knocking operation on the knocking part 10 as usual.

That is, since the sliding movement of the inner cylinder 5 in the forward direction is restricted by the inner wall stepped portion 1a of the outer cylinder 1 as described above, the core pipe 8 is prevented from moving in the forward direction with respect to the inner cylinder 5 due to the knocking action. Then, the core 21 is ejected by the core feeding mechanism 9.

The second method, which is extremely convenient especially while writing, is to hold the knock groove 5a of the inner cylinder 5 with two fingertips while gripping the outer cylinder 1, and point it backward. When the inner cylinder 5 is pulled and moved, the inner cylinder 5 moves backward against the biasing force of the first elastic body 6, but the core pipe 8 moves in the backward direction because the knock holder 16 is locked by the crown screw 4. Since the movement is restricted, the lead 21 will protrude from the tip 7 in the same way as in a normal knocking operation.

Therefore, according to this method, the lead 21 can be protruded very easily without changing the grip of the outer cylinder 1 when writing.

Furthermore, in addition to the knocking action with the fingertip, the lead 21 can also be made to protrude by attaching the cap 3 for protecting the lead.

That is, when the cap 3 is fitted into the outer cylinder 1 at the end of writing, the knock step 19a of the cap body 19 engages with the knock groove 5a of the inner cylinder 5, so that the inner cylinder 5 and the core pipe 8
performs the same knocking action with the fingertips described above and presses the core 21.
will protrude from the tip 7.

Therefore, in this method, by removing the cap 3 when writing, the lead 21 always protrudes, so that writing can be performed immediately.

Here, since this cap 3 is equipped with the centering-foot holding mechanism 2, even if the lead 21 protrudes too much from the tip 7 when the cap is attached, the base abutting member 2 of the centering-foot holding mechanism 2
is pressed by the tip of the core 21 and retreats against the biasing force of the fourth elastic body 23.

This retraction operation is continued until the lead chuck 11 is released from biting into the core 21 by the above-mentioned knocking operation.

When the lead chuck 11 releases the lead 21, the lead 21 is then pressed into the inner cylinder 5 to a predetermined length by the base contact member 22 urged by the fourth elastic body 23. Moving.

Therefore, even if the lead 21 protrudes too much from the tip 7 when the cap is attached, the lead 21 will not break or slip at all due to the centering-foot holding mechanism 2, and the amount of lead protrusion suitable for writing can always be maintained.

Furthermore, since the centering and foot holding mechanism 2 is provided with an adjusting section 20, if it is desired to change the amount of protrusion of the core 21 as required, the adjusting section 20 can be moved in the axial direction. Since the distance between the base abutting member 22 locked to the elastic body 23 and the tip 7 can be changed, the amount of protrusion of the core 21 can be changed by the above-mentioned operation.

FIG. 2 shows another embodiment, in which the position of the first elastic body 6 is changed.

A first elastic body 6 is landed between the knock holder 16 and the crown screw 4 with a cushion interval A, and this first
The entire inner cylinder 5 and core pipe 8 are urged in the forward direction by the urging force of the elastic body 6, and the same effect as the embodiment shown in FIG. 1 can be obtained.

As described above, according to the writing instrument of this invention, the protrusion of the lead can be performed not only by the knocking action of the knocking part but also by the knocking action of the inner cylinder, and any one of these methods may be selected as necessary.

In particular, since the knocking action of the inner cylinder can be performed with the fingertips, the lead can be ejected without changing the grip of the outer cylinder during writing, which has an extremely excellent practical effect.

In this embodiment, a mechanical pencil has been described, but the present invention is not limited to this, and can be used for any type of writing instrument such as a knock-type ballpoint pen.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of one embodiment of this invention, and FIG. 2 shows another embodiment of the knock portion. 1...Outer cylinder, 5...Inner cylinder, 6...
...Elastic body (first elastic body), 8... Core pipe, 9... Core feeding mechanism, 10... Knocking part.

Claims (1)

[Scope of utility model registration request] An inner tube 5 that is slidably housed within a predetermined range within an outer tube 1 for gripping, a core pipe 8 that is slidably housed within this inner tube 5, and the vicinity of the tip of this core pipe 8. a core feeding mechanism 9 provided at the core pipe 8; a knock portion 10 provided at the rear end of the core pipe 8; and an elastic body 6 provided within the outer cylinder 1 and urging the inner cylinder 5 in the forward direction. A writing instrument equipped with