JPS597108Y2 - Double knock mechanical pencil - Google Patents

Description

[Detailed description of the invention] This invention allows the tip pipe to protrude from the outer case when writing, etc., and allows the lead to be drawn out sequentially from the tip pipe in this state, protecting the tip pipe and ensuring safety when carrying. This pertains to a double-knock type mechanical pencil whose tip pipe can be stored in the outer case in order to improve its performance. Furthermore, the clip does not become fatigued, so the material can be easily selected, and economical efficiency can be improved, and the clip can be provided at a low cost with a simple structure.

In order to achieve this object, the present invention knocks the internal mechanism slidably supported by the outer case so that the tip pipe of the internal mechanism protrudes from the outer case or is housed within the outer case, In a double-knock type mechanical pencil, the leads are sequentially fed out from the tip pipe by knocking on a lead feeding mechanism in the internal mechanism with the tip pipe protruding from the outer case, wherein the internal mechanism is provided with a locking part. , a base of a flexible clip is supported in a fixed state on the outer case, and a middle part of the clip protrudes inward from a hole formed in the outer case, and the tip pipe protrudes from the outer case. The locking portion is provided with a locking protrusion that can be selectively engaged or disengaged by utilizing the elasticity of the clip in order to cause the clip to move or retreat.

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

As shown in FIGS. 1 to 5, the outer case 1 consists of a barrel 2 and an outer cap 3, and the base of the outer cap 3 is screwed onto the tip of the barrel 2.

An internal mechanism 4 is slidably supported inside the outer case 1.

This internal mechanism 4 includes an inner mouthpiece 5, a tip pipe 6, and a lead holder 7.
, a support tube 8 and a core feeding mechanism 10.

A tip pipe 6 is attached to the tip of the inner cap 5, and the inner cap 5
A lead holder 7 is inserted inside the tip of the support cylinder 8, and the outside of the tip of the support tube 8 is screwed onto the inside of the base of the inner mouthpiece 5.

These inner cap 5, tip pipe 6, and support tube 8 are slidably inserted inside the tip of the outer case 1, and as these move forward, the tip pipe 6 is projected from the outer cap 3 of the outer case 1 (
(See Figure 1).

By retreating, the tip pipe 6 is stored inside the outer cap 3 of the outer case 1 (see Fig. 2), and at the forward limit, the outer circumferential inclined step 11 of the inner cap 5 comes into contact with the inclined step 12 of the outer cap 3. regulated by.

The lead feeding mechanism 10 includes a chuck 13 for gripping a lead such as a 3-split lead.
It is removed from the fastener 14, relay pipe 15, core case 16, etc.

In this lead feeding mechanism 10, a relay pipe 15 is connected to the rear end of a chuck 13, and a lead case 1 is connected to the rear end of the relay pipe 15.
6 are connected, the chuck 13 is inserted inside the rear part of the inner mouthpiece 5, the tip of the relay pipe 15 is inserted inside the support tube 8, and the core case 16 is inserted inside the shaft tube 2.

A fastener 14 is fitted inside the sliding guide hole 17 of the inner mouthpiece 5 at the outer periphery of the tip chuck portion 13a of the chuck 13.

Furthermore, an eraser 21 attached to a stopper 20 equipped with a cleaning rod 18 is removably attached to the inside of the rear end of the lead case 16, and a knock force bar 22 is removably attached to the outside of the rear end of the lead case 16. It is being

A compression panel 23 is interposed between the support cylinder 8 and the lead case 16, and the elasticity of the compression spring 23 urges the lead feeding mechanism 10 rearward.

In this state, the tip chuck portion 13a of the chuck 13 is drawn into the inside of the fastener 14 whose retreat is restricted by the tip surface of the support tube 8, and is closed, thereby being able to grip the core l.

When the sock cover 22 is pressed and the core feeding mechanism 10 is moved forward with the inner mouthpiece 5 etc. fixed, the chuck 13 moves forward together with the fastener 14 in a closed state, and the fastener 14 closes in the sliding guide hole. When it comes into contact with the front end wall 24 of the chuck 17, the chuck 13 moves forward in an open state.

Therefore, the core l is gripped by the chuck 13 and moves forward by the distance that the fastener 14 moves forward.

On the contrary, when the pressing force of the knock force bar 22 is released and the lead feeding mechanism 10 is moved backward, the chuck 13 is initially moved back in an open state, and then the fastener 14 is moved back along with the fastener 14. When the support cylinder 8 restricts the retreat, the tip chuck portion 13a of the chuck 13 is drawn into the fastener 14 and closed, allowing the lead l to be gripped at a position rearward from the gripping position.

During this time, the lead l is held by the lead holder 7, so there is no risk of it moving backward.

A compression spring 25 is interposed between the outer circumferential wall inside the tip of the shaft cylinder 2 and the step on the outer circumference of the core case 16, and the elasticity of the compression spring 25 biases the internal mechanism 4 rearward, as shown in FIG. As shown in the figure, a tip pipe 6 is housed inside the outer mouthpiece 3.

By pressing the knock force bar 22 and moving the internal mechanism 4 forward against the elasticity of the compression spring 25, the tip pipe 6 can be made to protrude from the outer mouth ring 3 as shown in FIG.

A clip 26 is supported at the rear end of the shaft tube 2 of the outer case 1.

This clip 26 is made of a resin with excellent elasticity and is shaped to have flexibility, and the base is bent into a U-shape.
A protrusion 28 is provided on the inner side of the tip of the bent piece 27 .

The bent portion of the base of the clip 26 is pressed against the expanded portion 2a formed in a part of the rear end of the shaft tube 2, and the protrusion 28
is elastically engaged with a hole 30 formed in the expanded portion 2a of the shaft tube 2, and is supported in a fixed state.

Therefore, by pulling its tip outward, the clip 26 can elastically move away from the barrel 2 from the bent portion, and by releasing it, it can elastically return along the barrel 2.

A pair of clip force bars 31 are integrally provided on the outer side of the rear end of the shaft cylinder 2 so as to sandwich both rear sides of the clip 26 .

A locking portion 32 is provided on the outer periphery of the rear end of the core case 16 of the internal mechanism 4, and the locking portion 32 has a diameter that gradually decreases from the rear end to the tip.

A locking protrusion 33 is integrally provided on the middle part of the clip 26, that is, inside the elastic part, at a position hidden inside the cover 31, and this locking protrusion 33 is connected to a hole 34 formed in the shaft cylinder 2.
It protrudes further into the shaft cylinder 2.

The inner surface of the locking protrusion 33 is shaped so as to gradually slope outward toward the rear.

This locking protrusion 33 selectively engages with or disengages from the locking part 32 of the core case 16, but the internal mechanism 4 is moved forward while the locking protrusion 33 and the locking part 32 are engaged. It is set so that the tip pipe 6 can be held in position and protruded from the outer mouthpiece 3 (see FIG. 1).

Further, when the locking protrusion 33 is disengaged from the locking portion 32, the internal mechanism 4 can be moved backward by the compression spring 25, and the tip pipe 6 can be stored inside the outer mouthpiece 3.
The retraction limit is regulated by the locking portion 32 engaging with a locking portion 35 formed at the tip of the bent piece 27 of the clip 26 so as to be inclined inward.

Next, how to use the present invention will be explained.

Now, it is assumed that the internal mechanism 4 is retracted and the tip pipe 6 is housed in the outer mouthpiece 3 of the outer case 1, as shown in FIG.

From this state, the knock force bar 22 is pressed to move the internal mechanism 4 forward against the elasticity of the compression spring 25, causing the tip pipe 6 to protrude from the outer mouth ring 3.

During this time, the locking portion 32 provided on the core case 16 of the internal mechanism 4
The elastic deflection of the clip 26 causes the locking protrusion 33 to escape outward and overcome it, and the locking portion 32 engages the clip 26.
Due to the restoring elasticity of
The tip pipe 6 is held in a state of protruding from the outer mouthpiece 3 by contacting the stepped portion 12 of the pipe.

By knocking the knocking force bar 22, the lead feeding mechanism 10 moves forward and backward as described above, and the lead l is successively projected from the tip pipe 6, allowing writing and other operations to be performed.

In addition, when not in use, the tip side of the clip 26 is pulled outward by utilizing its elasticity, and the locking protrusion 33 is retreated outward to be separated from the locking portion 32, whereby the internal mechanism 4 is moved by the elasticity of the compression spring 25. 1, and the tip pipe 6 can be stored inside the outer mouthpiece 3 as shown in FIG.

Therefore, the tip pipe 6 can be protected and safe when carried.

6 and 7 show other embodiments of the present invention.

In this embodiment, the outer cylinder 36 is placed from the rear end of the support cylinder 8 to a slightly rearward side of the middle part of the core case 16, and the outer cylinder 36 is fixed to the support cylinder 8 by caulking.
A locking tube 37 having a locking portion 32 a at the rear end is fitted to the rear side of the shaft tube 2 and the locking tube 37 is fixed to the outer tube 36 by caulking. A compression spring 25 having a stronger spring force than the compression spring 23 that urges the core feeding mechanism 10 rearward is interposed between the two.

On the other hand, the clip 26 is shaped by a metal plate spring material, and the protrusion 28 and the locking protrusion 33 are shaped by cutting and raising, and the other construction is the same as in the above-mentioned practical example.

By pressing the knock force bar 22, the lead feeding mechanism 10 is first advanced, and when the rear stepped portion 38 of the lead case 16 in the lead feeding mechanism 10 comes into contact with the rear end of the locking cylinder 37, the locking is performed. The tube 37, the outer tube 36, the support tube 8, the inner cap 5, the tip pipe 6, etc. are moved forward together, the tip pipe 6 is made to protrude from the outer cap 3, and the locking portion 32 a of the locking tube 37 is moved forward.
By utilizing the deflection of the clip 26, the clip 26 can be used to overcome the locking protrusion 33 and engage with the front side thereof.

Thereafter, by releasing the pressing force of the knock force bar, the core feeding mechanism 10 is retracted by the elasticity of the compression spring 23.

Therefore, by knocking the sock cover 22 at the interval between the stepped portion 38 of the lead case 16 and the rear end of the locking tube 37, the lead feeding mechanism 10 is moved forward and backward, and the lead l is moved into the tip pipe 6.
It is possible to pay out more sequentially.

Also, pull the tip of the clip 26 outward to lock the locking protrusion 33.
By releasing the locking tube 37 from the locking portion 32a,
, the outer tube 36 , the support tube 8 , the inner cap 5 , the tip pipe 8 , etc. can be retracted by the elasticity of the compression spring 25 , and the tip pipe 6 can be stored inside the outer cap 3 .

As is clear from the above, according to the present invention, a locking part is provided in the internal mechanism, the base of the flexible clip is supported in a fixed state in the outer case, and the intermediate part of the clip, that is, the elastic part, is provided with the locking part. A locking protrusion that can be engaged with or disengaged from the locking portion by utilizing the elasticity of the clip is provided in a protruding manner.

By pressing the internal mechanism, the locking protrusion can be engaged with the locking part and the tip pipe can be made to protrude from the outer case, and by pulling the clip outward using its own elasticity. The tip pipe can be stored in the outer case by disengaging the locking protrusion from the locking part. At this time, since the locking protrusion is provided in the middle of the clip, the clip can be moved outward at a small angle. By pulling it, it can be easily released from the locking part, and therefore the tip pipe can be easily projected and stored.

Moreover, as mentioned above, by pulling the clip outward, the locking protrusion is released from the locking part, and the tip pipe is stored in the outer case. Since the tip pipe is pulled to the end, the tip pipe can be reliably stored, and danger and damage to the tip pipe can be prevented.

Further, as mentioned above, the base of the clip is supported in a fixed state on the outer case, and this clip has flexibility and uses its own elastic deformation to lock the locking protrusion to the locking part of the internal mechanism. The locking protrusion can be detached from the clip, and the locking protrusion can be set at any position on the elastic part of the clip, giving flexibility in the setting location, making it easy to construct a support structure for the clip to the outer case. and can be provided at low cost.

Furthermore, it is sufficient to elastically deform the clip only when the locking protrusion and the locking portion engage and disengage, thereby making it possible to prevent fatigue of the clip.

Therefore, the locking protrusion can be reliably locked to the locking part, and the protrusion and storage operations of the tip pipe can be performed reliably, and the material can be easily selected, leading to improved economic efficiency. There are advantages such as

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the double-knock mechanical pencil of the present invention. Figure 1 is a vertical cross-sectional view with the tip pipe protruding from the outer case, and Figure 2 is a longitudinal cross-sectional view with the tip pipe protruded from the outer case. A vertical cross-sectional view of the state stored in the case, Figure 3 is the first
FIG. 4 is a side view of the main part, FIG. 5 is a plan view of the main part, FIGS. 6 and 7 show other embodiments of the present invention, and FIG. 7 is a longitudinal sectional view, and FIG. 7 is a plan view of the main part. 1...Outer case, 2...Shaft cylinder, 3...
...Outer cap, 4...Internal mechanism, 5...
...Inner cap, 6...Tip pipe, 7...
・Lead holder, 10...Lead feeding mechanism, 13...
... Chuck, 14 ... Fastener, 15 ...
... Relay pipe, 16 ... Core case, 22
... Knock force bar, 26 ... Clip, 32, 32a ... Locking part, 33 ...
Locking protrusion, 36... Outer cylinder, 37... Locking cylinder.

Claims (1)

[Scope of utility model registration request] By knocking the internal mechanism that is slidably supported on the outer case, the tip pipe of the internal mechanism is made to protrude from the outer case, or is housed in the outer case, and the tip pipe is made to protrude from the outer case. , a double-knock mechanical pencil in which the lead is sequentially drawn out from the tip pipe by knocking a lead feeding mechanism in the internal mechanism, wherein the internal mechanism is provided with a locking part, and the outer case is provided with a flexible clip. The base is supported in a fixed state, and the intermediate part of the clip projects inward through a hole formed in the outer case, and is provided in the locking part to cause the tip pipe to protrude or retreat from the outer case. A double-knock type mechanical pencil characterized by a protruding locking protrusion that can be selectively engaged or detached by utilizing the elasticity of the clip.