JPH053351Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to writing instruments such as ballpoint pens, needle pens, marking pens, and sharp pencils. The present invention relates to a locking mechanism for a writing instrument in which the knob is locked while protruding from the tip.

[Conventional technology and its problems]

Conventional writing implements such as ballpoint pens use a rotating cam mechanism consisting of a rotating cam, cam bar, fixed cam, etc. inside the outer cylinder, which requires a large number of parts, complicates the structure, and makes it expensive. Not only is the assembly work not easy, but the rotating cam mechanism gets in the way and limits the length of the writing shaft, making it impossible to increase its length.

[Means for solving problems]

In order to solve the above problems, the lock mechanism of the present invention inserts a writing shaft 2 into an outer cylinder 1 as shown in the figure, and provides an elastic body 3 between the writing shaft 2 and the outer cylinder 1. The notch part 4 protruding from the rear end of the outer cylinder 1 is attached to the rear part of the writing shaft 2, and the notch part 4 is locked inside the outer cylinder 1. An axial groove 5 is provided, a locking protrusion 6 is provided in the axial groove 5, and the axial groove 5 is provided on the outer periphery of the notch portion 4.
A lock member 10 is fitted in which a lock part 7 along the inside and a guide part 8 along the notch part 4 are connected at a fulcrum part 9, and protrude from the hole 11 of the outer cylinder 1 from the fulcrum part 9 to the outer surface of one lock part 7. The other lock part 7 is provided with a locking hook part 13 on its inner surface to which the locking protrusion 6 of the notch part 4 is locked when the other lock part 7 is knocked. A relief groove 14 for the locking hook portion 13 is provided on the inner surface of the locking hook portion 13.

[Operation] When the notch part 4 is knocked, the writing shaft 2 moves forward against the elastic body 3, and the tip of the writing shaft 2 protrudes from the tip of the outer cylinder 1, and is engaged by the notch of the notch part 4. The locking protrusion 6 is the locking hook portion 1 of the locking portion 7
3 and is locked to the hook portion 13, and the writing shaft body 2
The tip of the brush is held in a protruding state.

When the tip of the writing shaft 2 is to be retracted, when the operator 12 of the lock part 7 is pressed, the locking hook part 13 of the lock part 7 moves toward the relief groove 14 around the fulcrum part 9, and this The locked state between the hook portion 13 and the locking protrusion 6 is released, and the writing shaft 2 and the knob portion 4 move rearward due to the elasticity of the elastic body 3, and the tip of the writing shaft 2 is moved to the outer cylinder 1.
It can be retracted from the tip.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a sectional view of a writing instrument to which an embodiment of the locking mechanism of the present invention is applied, and shows an example of a ballpoint pen.

In FIG. 1, reference numeral 1 denotes an outer cylinder, which consists of a front part 1a and a rear part 1b screwed onto the front part 1a. 2 is a writing shaft inserted into the outer cylinder 1, and a return spring 3 is provided between the front part of the front part 1a of the outer cylinder 1 and the receiving part of the writing shaft 2. Reference numeral 4 denotes a notch portion that protrudes from the rear end of the rear portion 1b of the outer cylinder 1, and
It is attached to the rear part of. The notch portion 4 is secured to the rear end of the rear portion 1b of the outer cylinder 1 by a collar portion 15 and an inner ring portion 16 that engage with each other.

An axial groove 5 is provided in the rear portion 1b of the outer cylinder 1 at the notch portion 4, and a locking protrusion 6 is provided within the axial groove 5. A lock member 10 in which a lock part 7 along the axial groove 5 and a guide part 8 along the notch part 4 are connected to each other at a fulcrum part 9 is fitted on the partial outer periphery of the notch part 4 in front of the locking protrusion 6. has been done.

An operator 12 is provided on the outer surface of one of the lock portions 7 from the fulcrum portion 9, and protrudes from a hole 11 in the rear portion 1b of the outer cylinder 1, and a knob portion 4 is provided on the inner surface of the other lock portion 7. A locking hook portion 13 is provided with which the locking protrusion 6 of the notch portion 4 is locked when the lock is clicked. An escape groove 14 for the locking hook portion 13 is provided on the inner surface of the rear portion 1b of the outer cylinder 1.

In the above configuration, when the notch part 4 is clicked, the writing shaft body 2 moves forward against the return spring 3,
The tip of the writing shaft body 2 protrudes from the tip of the outer cylinder 1, and the locking protrusion 6 passes over the locking hook portion 13 of the locking portion 7 and is locked to the hook portion 13 by the notch of the notch portion 4, The tip of the writing shaft 2 is held in a protruding state (see FIG. 2).

When the tip of the writing shaft 2 is to be retracted, when the operator 12 of the lock part 7 is pressed, the locking hook part 13 of the lock part 7 moves toward the relief groove 14 around the fulcrum part 9, and this The locked state between the hook portion 13 and the locking protrusion 6 is released, and the writing shaft 2 and the knob portion 4 are moved rearward by the spring force of the return spring 3, and the tip of the writing shaft 2 is moved to the tip of the outer cylinder 1. (See Figure 1).

Next, the assembly order of this embodiment will be explained.

First, as shown in the third figure, the locking member 10 is fitted from the distal end side of the notch part 4. In this case, the locking hook part 13 of the locking part 7 engages with the axial groove 5 of the notch part 4. Then, the lock member 10 is fitted so that the guide part 8 comes into sliding contact with the outer surface of the notch part 4. FIG. 4 shows a state in which the locking member 10 is fitted into the notch.

Next, the notch part 4 is attached to the rear part of the writing shaft body 2, and this is inserted into the rear part 1b of the outer cylinder 1 from the front end side, and the operator 12 is inserted into the hole 11. Thereafter, the front part of the writing shaft body 2 is fitted into the front part 1a of the outer cylinder 1 together with the return spring 3, and the front part 1a and the rear part 1b of the outer cylinder 1 are screwed together to complete the assembly.

The lock mechanism of this invention is not only applicable to ballpoint pens.
It can also be applied to needle pens, marking pens, sharp pencils, etc. The application to rottling pens and marking pens is the same as that to ballpoint pens, so a description thereof will be omitted. In the case of a mechanical pencil, after locking the pencil as described above by knocking the notch part, the lead feeding mechanism that constitutes the writing shaft is activated by lightly operating the notch part, and the lead is removed from the tip of the outer cylinder 1. Just let it roll out.

[Effect of idea]

As described above, according to the present invention, it can be constructed from two parts, the knob part 4 and the locking member 10, so the construction is simpler and cheaper than when using a conventional rotary cam mechanism, and the assembly work is also reduced. Not only is it easier to use, but unlike conventional rotary cam mechanisms, the center of the locking mechanism is hollow, and the writing shaft 2 is not obstructed by the locking mechanism. It can be made much longer than the previous one, and has the special effect of allowing a long writing shaft 2 to be attached to a short outer cylinder 1.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a writing instrument to which an embodiment of the locking mechanism of the present invention is applied, Fig. 2 is a cross-sectional view showing the state during writing, Fig. 3 is a partially exploded perspective view of the locking mechanism of the present invention, and Fig. 4 The figure is a perspective view of the assembly. DESCRIPTION OF SYMBOLS 1... Outer cylinder, 2... Writing shaft body, 3... Elastic body (return spring), 4... Knot part, 5... Axial groove,
6... Locking protrusion, 7... Lock part, 8... Guide part, 9... Fulcrum part, 10... Lock member, 11...
...hole, 12...operator, 13...locking hook, 14
...Escape (groove).

Claims (1)

[Scope of utility model registration request] A writing shaft 2 is inserted into the outer cylinder 1, an elastic body 3 is provided between the writing shaft 2 and the outer cylinder 1, and a notch 4 protruding from the rear end of the outer cylinder 1 is inserted into the writing shaft 2. It is attached to the rear part and locks this notch part 4 within the outer cylinder 1, and an axial groove 5 is provided in the part of the notch part 4 in the outer cylinder 1, and a locking protrusion is provided in this axial groove 5. 6, and a locking portion 7 along the axial groove 5 is provided on the outer periphery of the notch portion 4.
A lock member 10 is fitted in which a guide part 8 along the notch part 4 is connected at a fulcrum part 9, and an operator 12 is provided on the outer surface of one of the lock parts 7 from the fulcrum part 9, protruding from the hole 11 of the outer cylinder 1. A locking hook portion 13 is provided on the inner surface of the other lock portion 7 to which the locking protrusion 6 of the notch portion 4 is locked when the notch portion 4 is knocked, and this locking hook portion 13 is provided on the inner surface of the outer cylinder 1. Relief groove 1 of hook part 13
A locking mechanism for a writing instrument with 4.