JPH0444390Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention uses a pushing member installed in a barrel so as to be movable in the axial direction. This is related to a safety device for a writing instrument that is configured to emerge and retract from the opening at the front end of the cylinder, and when the writing instrument is not in the writing state, that is, when it is hung in a pocket of clothes etc. by the clamping force of the clip piece. Even if the pushing member is pressed by mistake while the writing body is in use, the writing body ejection/removal mechanism does not operate, thereby preventing the writing body from being inadvertently exposed outside the barrel cylinder. It is.

"Prior Art and Problems to be Solved by the Present Proposal" Conventionally, there have been various writing body ejection/removal mechanisms in which a writing body is made to protrude and retract from a barrel by the action of moving a pushing member in the front-rear direction. Therefore, when a writing instrument having this type of writing body retraction mechanism is not in the writing state, that is, when the tip of the writing body is not exposed from the front end opening of the barrel, the clamping force of the clip piece is applied to the pocket of clothes, etc. As a result, the pressing portion of the pressing member exposed outside the shaft cylinder is often pressed by mistake.
As a result, there are frequent accidents in which clothing is soiled by the tip of the writing body exposed from the front end opening of the barrel when the writing body ejection mechanism operates.

"Means for Solving the Problem" The present invention is intended to eliminate the drawbacks seen in the prior art. The clip piece and the push member are connected so that the outer edge of the locking member, which has an engaging portion that protrudes toward the push member that engages with the clip member, is exposed through the barrel through-hole provided at a position opposite to the clip side. A means to solve this problem is to attach it via an elastic member between the two.

"Operations" and "Examples" Next, examples related to the present invention will be described, and their operations will be explained.

The pushing member 1 is mounted in a shaft cylinder 2 so as to be movable in the axial direction, and the writing body ejection/retraction mechanism is operated when the pushing member 1 is moved back and forth in the axial direction.

Next, an example of the mounting structure of the push member 1 and the mechanism of the writing body appearing and retracting will be explained based on the drawings.

Although there are various other possible relationship structures between the two, a relatively reasonable example will be explained here.

The pushing member 1 consists of a pressing part 1b exposed from the rear end opening 2b of the shaft cylinder 2 and a small diameter part 1a extending in the axial direction within the shaft cylinder 2. An engaging protrusion 5 is housed therein so as to be exposed from the outer peripheral surface of the shaft cylinder 2 by the elastic force of the coil spring 4. The engagement protrusion 5 moves within the long groove 2c provided in the barrel 2 as the pushing member 1 moves forward (in the direction of the front end opening 2a of the barrel), and eventually the clip piece 6 located above the long groove 2c moves. Front end 6a
It engages with the notch 7 formed in the.

Further, the pushing member 1 includes a coil spring 9 mounted between the stepped portion 8b of the writing body 8 and the inner stepped portion 2d of the shaft cylinder.
It is attached by being pushed toward the rear end opening 2b of the shaft cylinder. As will be described later, 10a in the figure is an end face of the spring member 10 fixed to the inner circumferential surface of the rear end opening 2b of the shaft cylinder, and the step 1c formed on the push member 1 comes into contact with this end face 10a, causing the push member to 1 from falling out of the shaft cylinder 2.

To obtain the writing state, press the pressing part 1b of the pressing member 1.
It is only necessary to press the writing body 8 against the elastic force of the coil spring 9. As a result, the writing body 8 in contact with the pushing member 1 moves forward, and its tip 8a is exposed from the front end opening 2a of the barrel. At this time, if the engaging protrusion of the push member is engaged with the notch 7 of the clip piece, this writing state will be reliably maintained.

To release the writing state, it is sufficient to release the engagement between the notch 7 of the clip piece and the engaging protrusion 5 of the push member. It will return to its original state.

The clip piece 6 is attached to the shaft cylinder 2 by inserting into its base 6c the plate-shaped portion 10b of the spring member 10 fixed to the rear end opening 2b of the shaft cylinder as described above. It becomes possible to swing in a direction perpendicular to the axial direction of the shaft tube 2 using the base 6c side as a fulcrum.

6b is the rear end of the clip piece 6, and by pressing this rear end 6b, the front end 6a is separated from the outer circumferential surface of the shaft cylinder 2, and the above-mentioned pressing member is engaged. The engagement between the protrusion 5 and the notch 7 of the clip piece is released.

Thus, the cursive writing mechanism consisting of the engagement protrusion 5 of the push member and the notch 7 of the clip piece is constructed by moving the engagement protrusion 5 back and forth in the axial direction of the push member 1.
The writing body 8 is caused to protrude and retract from the shaft tube 2 by the engagement and disengagement action between the notch portion 7 and the notch portion 7 .

A locking portion 11 of the push member 1 that protrudes in the direction of the clip piece 6 is provided on the small diameter portion 1a of the push member 1, and a locking member 12 having an engaging portion 12a that engages with the locking portion 11 is provided. The outer edge 12b of the shaft tube 2 is exposed through a through hole 2e formed at a position facing the clip piece 6, and the elastic member 13 is installed between the pusher member 1 and the clip piece 6. be.

The engaging portion 12a of the locking member 12 is connected to the locking member 1.
2 moves toward the center of the shaft cylinder 2 through the shaft cylinder through hole 2e, it is important that it engages with the locking part 11 of the push member, and is opposed to the locking part 11 of the push member. It is located at the location. In addition, the locking member 1
2 normally has its outer side 12b exposed from the shaft cylinder through hole 2e due to the elastic force of the elastic member 13, but when pressurized thereon, the elastic member 1
It moves toward the center of the shaft cylinder 2 against the elastic force of 3, and engages the engaging portion 12a with the locking portion 11 of the push member as described above. The elastic member 13 exposes the outer side part 12b of the locking member 12 from the shaft cylinder through hole 2e, and also smoothly moves the outer side part 12b toward the center of the shaft cylinder 2 in response to the pressure applied to the outer side part 12b. It is sufficient if the object to be moved has just the right amount of elasticity.

Although the elastic member 13 is made of a rubber material here, it is preferable to form the elastic member 13 into a shape that has a small contact area and low frictional resistance as much as possible in relation to the movement of the pushing member 1.

It should be noted that the elastic member 13 is not limited to a rubber material, and may of course be made of something like a spring member. It is preferable to form the shape in such a way that there is no small amount of space. In addition, the locking member 12 installed in the shaft cylinder 2 is inserted in the direction of the shaft center of the shaft cylinder 2 with the elastic member 13 sandwiched therebetween, and is pushed toward a part located in front and back of the engaging portion 12a in the direction of the member 1. Extending protrusion 12
c is formed. The existence of this protrusion 12c is due to
When the locking member 12 moves toward the center of the shaft cylinder 2 and its engaging portion 12a engages with the locking portion 11 of the push member, the locking member 12 is more stable by keeping the balance of the movement. This helps in achieving and maintaining the engaged state.

``Effect of the invention'' As described above, the present invention is equipped with a writing body retraction mechanism that is operated by the back and forth movement of a push member that is movable in the axial direction of the barrel. In a writing instrument having a clip piece attached so as to be swingable in a direction perpendicular to the writing instrument, the outer edge of the writing instrument is inserted through a barrel through-hole bored between the push member and the clip piece at a position facing the clip piece. The locking member is attached via the resilient member so as to be exposed outside the barrel, and when the locking member moves toward the center of the barrel, the engaging portion of the locking member and the pushing member Since the locking portion is configured to engage, when the writing instrument is hung in a pocket of clothing using the clamping force of the clip piece, it will not be affected by the presence of fabric of the clothing being clamped. Therefore, the locking member that is moved toward the center of the barrel engages its engaging portion with the locking portion of the pushing member, so even if the pressing portion of the pushing member is pressed by mistake, the locking member will not move. Forward movement is prevented, and therefore, the writing body ejection/removal mechanism is not activated, and staining of clothing or the like due to exposure of the writing body to the outside of the barrel can be reliably prevented.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view showing the front part of a writing instrument in which the present invention is implemented, Figure 2 is a cross-sectional view showing the central part, Figure 3 is a cross-sectional view showing the rear part, and Figure 4 is a cross-sectional view showing the rear part. FIG. 2 is a sectional view taken along line A-A. 1...Pushing member, 2a...Shaft cylinder front end opening, 2
b...Shaft cylinder rear end opening, 2c...Long groove, 2e...
Through hole, 5... Engaging protrusion, 6... Clip piece, 7...
...Notch, 8... Cursive, 10... Spring member, 1
1... Locking part of push member, 12... Locking member,
12a...engaging portion, 12b...outer side portion, 12c...
...Protruding portion, 13... Resilient member.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A cursive body that is constructed so that the cursive body is moved in and out of the front end opening of the barrel by the back and forth movement of a push member that is movably mounted in the barrel in the axial direction. In a writing instrument equipped with a mechanism and in which a clip piece is attached so as to be swingable in a direction perpendicular to the axial direction of the barrel, a locking portion 11 that protrudes in the direction of the clip piece 6 is provided on the push member 1, and this locking A locking member 12 having an engaging portion 12a protruding in the direction of the push member 1 that engages the portion 11 is exposed through a barrel through-hole 2e drilled at a position where its outer side portion 12b faces the clip piece 6. A safety device for a writing body retraction mechanism in a writing instrument, characterized in that it is installed between a push member 1 and a clip piece 6 via a resilient member 13. (2) In the axial direction of the shaft tube 2, the locking member 12
The writing instrument according to claim 1 of the utility model registration claim, characterized in that a protruding part 12c extending in the direction of the pushing member 1 is formed at a position in front and back of the engaging part 12a and the resilient member 13. A safety device for the cursive writing mechanism.