JPH0443346Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention repeats the operation of protruding the writing part of the cursive from the opening of the barrel when writing, and retracting the writing part and storing it in the barrel when not writing. This writing instrument relates to a tip end of a writing instrument in which the tip member slides in conjunction with the operation of the writing body to open the lid of the barrel opening and the writing body protrudes from the barrel opening to create a writable state. .

Conventional technology Traditionally, when not writing, the cursive writing body was stored inside the barrel.
Regarding a writing instrument structure in which the tip member moves forward during writing to open the lid of the barrel opening and also moves the writing body forward to configure the writing state, Japanese Patent Application Laid-Open No. 59-
It is disclosed in Publication No. 124898, etc.

Problems that the invention aims to solve However, with the conventional tip structure that opens the lid and moves the writing body forward to enter the writing state, the opening of the lid and the advancement of the writing body are performed in two or more operations. The mechanism for ejecting and retracting the cursive font tends to be complicated, and in order to simplify the mechanism, the tip structure in which the cursive font pushes the lid to open the lid may make the opening/closing of the lid uncertain or The body is subject to wear and tear, and there are problems with durability.

Means for Solving the Problems The present invention solves the above-mentioned problems, opens and closes the lid and advances and retreats the cursive in one operation, securely opens and closes the lid, and opens and closes the lid. To provide a tip of a writing instrument that does not cause damage and satisfies long-term practicality.

The configuration of the present invention will be explained below based on drawings of embodiments.

The tip member 3 has a cavity whose diameter is tapered toward the opening, and in the side axis direction,
Slits 31 are provided facing each other.

The opening/closing member 5 includes a cylindrical part 53 having a central hole that allows the tip of the writing body 2 to be exposed and retracted, and a plurality of rigid elastic members extending from the cylindrical part 53 and having an inwardly directed split lid body 51 at the tip. It consists of a support piece 52, and one or more spring seats (two in this embodiment) 55, 56 are provided at the rear end of the cylindrical portion 53.

The holder 6 is provided with an inward protrusion 61 for supporting and fixing the opening/closing member 5 on its axis, and the inward protrusion 61 is fitted into the stopper groove 54 of the opening/closing member 5 or is glued or welded to the opening/closing member 5. It is supported on the axis. Further, the inward protrusion 61 is inserted into the slit 31 of the tip member 3 to form a space in which the tip member 3 can slide.

The sliding tube 4 has spring seats 41 and 42 at the front and rear, respectively.
and is fixed to the rear end of the tip member 3,
The tip member 3 is configured to be slidable in conjunction with the movement of the sliding tube 4 in response to the stress caused by the spring bodies 8 and 9.

A spring body 9 is placed between the spring seat 41 and the first shoulder portion 21 of the writing body 2, a spring body 8 is placed between the spring seat 42 and the spring seat 55, and a spring body 8 is placed between the spring seat 56 and the first shoulder portion 21 of the writing body 2. 2
A spring body 10 is interposed between the shoulder portion 22 and the tip member 3 to be movable in conjunction with the forward and backward movement of the writing body 2. Furthermore, the spring body 8 is set to have a smaller spring constant than the spring body 9, and immediately after being set on the barrel 7 (when not writing), the force required to compress the spring body 9 (hereinafter referred to as compression) is applied. The compressive force of the spring body 8 is configured to be larger than the compressive force of the spring body 8. The spring body 10 is an auxiliary member for reliably moving the writing body 2 backward with respect to the barrel 7, and has the function of sliding the tip member 3 of the present invention to open and close the split lid body 51. Completely unrelated and not necessary.

Function First, the function when the cursive 2 is protruded will be described. When not writing, the compressive force of the spring body 8 is larger than that of the spring body 9, but the spring constant of the spring body 9 is larger than that of the spring body 8. Therefore, when the writing body 2 is moved forward from when not writing, the spring body 9 is first compressed to increase the compressive force. Furthermore, at a certain position where the writing body 2 moves forward, the compressive force of the spring body 9 and the compressive force of the spring body 8 are balanced,
When the writing body 2 is further advanced, the sliding tube 4 moves forward while compressing the spring body 8 due to the compressive force of the spring body 9. As the sliding tube 4 moves forward and the tapered part of the tip member 3 moves forward, the split lid body 51
is biased in the radial direction by the support piece 52 having rigid elasticity, and is therefore opened in pressure contact with the tapered portion. After the opening of the tip member 3 is opened, the writing part of the writing body 2 protrudes from the opening and becomes ready for writing (see FIG. 2). Here, due to the configuration in which the spring constant of the spring body 8 is smaller than that of the spring body 9, as the writing body 2 moves forward, the spring body 8
It is compressed more than the spring body 9, and the writing part does not reach the opening of the tip member 3 before the split lid 51 opens.

Next, the operation when the writing body 2 is stored in the barrel 7 will be described.

When the stopper holding the writing body 2 in the protruding state is released, the elastic force of the compressed spring bodies 9 and 10 acts on the writing body 2, and the elastic force of the spring body 8 acts on the sliding tube 4. , the writing body 2 and the sliding tube 4 are moved backward. Specifically, the cursive body 2 is first moved backward by the elastic force of the spring bodies 9 and 10, and the cursive body 2 is moved back to the extent that the divided lid body 51 does not touch the tip of the cursive body 2 even if the divided lid body 51 starts to close. When the sliding tube 4 retreats, the sliding tube 4 starts to retreat, and at the same time the tip member 3 connected to the sliding tube 4 retreats. Then, pressure is gradually applied in the radial direction to close the parts. The relative opening and closing timing of the split lid body 51 with respect to the writing body 2 is determined by the spring constants and natural lengths of the spring bodies 8 and 9, the spring lengths when assembled, and the spring lengths when in the writing state. .

Effects of the invention The split lid body 51 is always housed in the internal cavity of the tip member 3 without being exposed from the tip member 3, and the split lid body 51 and the support piece 52 are not exposed from the tip member 3 due to external pressure.
Of course, there is no dimensional change or damage, and the tip member 3 moves in the axial direction in conjunction with the forward and backward movement of the writing body 2, thereby opening and closing the split lid body 51.It is a one-action mechanism. Since it is easy to operate and can be operated reliably, it can satisfy the practicality as a lightweight writing instrument.

[Brief explanation of the drawing]

The drawings show one embodiment of the structure of the tip of the writing instrument according to the present invention, in which Fig. 1 is a longitudinal sectional view of the main part when not writing, Fig. 2 is a longitudinal sectional view of the main part when writing, and Fig. 3 is a longitudinal sectional view of the main part when writing. Fig. 1 is a cross-sectional view taken along the line A-A in Fig. 1, Fig. 4 is a perspective view of the tip member, Fig. 5 is a perspective view of the opening/closing member, Fig. 6 is a perspective view of the holder, and Fig. 7 is a perspective view of the sliding tube. FIG. 3 is a partially cutaway perspective view. 1... Writing instrument tip structure, 2... Cursive, 21
...First shoulder, 22...Second shoulder, 3...Tip member, 31...Slit, 4...Sliding tube, 41...
Spring seat, 42... Spring seat, 5... Opening/closing member, 51
... Divided lid body, 52 ... Support piece, 53 ... Cylindrical part, 54 ... Stopper groove, 55 ... Spring seat, 5
6... Spring seat, 6... Holder, 61... Inward projection, 7... Shaft body, 8... Spring body, 9... Spring body,
10...Spring body.

Claims (1)

[Scope of utility model registration request] In a writing instrument having a structure in which the writing part of the cursive body protrudes from the opening of the barrel when writing, and the writing part of the cursive body is repeatedly moved back and stored in the barrel when not writing, the tip of the barrel 7 has a tip. A tip member 3 having a cavity whose diameter is tapered toward the opening is inserted, and the tip member 3 is inserted into the writing body 2.
A plurality of slits 31 are provided in the side surface of the tip member 3 in the axial direction, and an opening/closing member 5 is housed inside. and the opening/closing member 5
consists of a cylindrical portion 53 and a plurality of rigid elastic supporting pieces 52 each having a split lid 51 at its tip that presses into contact with the tapered inner surface of the tip member 3; A spring body 8 is interposed between them, and a spring body 9 is interposed between the sliding tube 4 and the first shoulder portion 21 of the writing body 2, and the spring body 8 is The spring constant is set small, and in the non-writing state, the split lid body 51 is press-fitted to the inner surface of the tip member 3 and closes the opening of the tip member 3, and as the writing body 2 moves forward, the tip member 3 The tip part structure 1 of a writing instrument is configured to be in a writing state by moving forward and opening the split lid body 51.