JPH0513598Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a side-sliding mechanical pencil.

(Conventional technology and its problems) There are two types of centering devices, one in which the knob is moved forward and one in which the knob is moved backward, in which centering is performed by operating a knob protruding from the barrel with a fingertip. Proposals have been made, but the type that moves it forward requires a space for the notch stroke in front of the chuck set, resulting in a longer lead length, and the type that moves it backwards has the disadvantage of creating a space for the notch stroke in front of the chuck set. Each had their own problems, such as core regression, and there was still room for improvement.

(Purpose of the invention) The present invention was devised in view of the above-mentioned problems, and its purpose is to provide a side-sliding sharp pencil that has a short lead remaining and prevents the lead from retreating due to the writing load as much as possible. do.

(Means for Solving the Problems) The present invention is a sharp pencil in which a core detent member and a ball chuck mechanism are installed in the barrel, and a chuck ring is provided which is resiliently repelled forward while receiving the rotational load of a ring spring. , the chuck ring has a locking receiving portion that is locked to a locking portion in front of the arm of the knob that is provided to be slidable on the shaft cylinder and is resiliently repelled backward by a knob spring, and the locking receiving portion Further forward, there is a protrusion that engages with a groove formed in the barrel, and as the knob moves forward, the arm of the knob presses the chuck ring and moves it in the circumferential direction, causing the groove and protrusion to move. When the lock is released, the lock part and the lock receiving part are locked, and the lock is released by a release part formed on the shaft cylinder when the knob is moved backward, Furthermore, the object of the present invention is to provide a centering device for a side-sliding sharp pencil, which includes a stopper portion facing the rear end surface of the chuck body.

(Example) Hereinafter, the present invention will be explained based on the accompanying drawings.

In the figure, the left side is the front, and the right side is the rear.

In FIG. 1-A, a tip 3 having a known detent member 2 is screwed onto the front of the barrel 1. As shown in FIG. Further, a longitudinal hole 4 is formed in the side surface of the shaft cylinder 1, and a knock spring 5 is provided in the hole 4.
A part of an annular knob 6 which is elastically repelled rearward and is slidably disposed on the shaft cylinder 1 is provided so as to protrude.
An arm portion 7 is provided extending therefrom. In this embodiment, a part of the knob 6 is shown to protrude from the shaft tube 1, but the entire outer surface of the annular knob 6 may be provided to protrude. A locking portion 8 is provided in front of the arm portion 7, and a rearwardly inclined surface 7a is provided at the end of the locking portion 8.
is formed. Reference numeral 9 indicates an extension portion 10a.
The hole 1 formed in the shaft tube 1 and the groove 9b in which the
The rear end of the chuck ring is elastically repelled forward (see Fig. 7) under the rotational load of the ring spring 10 (see Fig. 6), which has a smaller elastic force than the knock spring 5 interposed between the An inclined surface 9a is formed opposite to the inclined surface 7a. The chuck ring 9 has the locking portion 8
A locking receiving portion 11 is provided in front of the locking receiving portion 11, and a protruding portion 1 that locks in a groove 12 formed in the shaft cylinder 1 is provided in front of the locking receiving portion 11.
3 is provided. The shaft cylinder 1 also has a release portion 1 for releasing the locking between the locking portion 8 and the locking receiving portion 11.
4 is formed. Incidentally, the inclined surfaces 7a and 9a are
An inclination angle is provided such that when the inclined surface 7a moves forward and presses the inclined surface 9a, the lock receiving part 11 (chuck ring 9) can move in the circumferential direction. In addition, inside the chuck ring 9, a chuck spring 15 provides a rearward repulsion, and a head outer surface receiving seat 16 is provided.
a chuck body 19 which can be opened and closed, and which brings a trochanter 17 disposed in abutment against an inclined guide surface 18 of a chuck ring 9;
By pressing the inclined surface 19b formed at the rear end of the two chuck pieces 19a which are joined at a swinging fulcrum with a stopper part 20 formed on the shaft cylinder, the head of the chuck body 19 is expanded along the inclined surface. The chuck body 19 is shown with the front openable.
It is also possible to adopt a known chuck that is divided into two pieces and each chuck piece is given self-expanding elasticity. In short, as a chuck body, it allows the core to move forward, but
Various types can be adopted as long as they can prevent the head from retreating by a wedge action and expand the head when pushed forward against the chuck ring 9.

Next, the centering operation will be explained based on the above-described configuration.

When the knob 6 is moved forward with a finger (in the direction of arrow a in the figure) (see Figure 1-C), the inclined surface 7a of the knob 6 presses the inclined surface 9a of the chuck ring 9, and the rotational load of the ring spring 10 is applied. Against this, the chuck ring 9 moves in the circumferential direction (in the direction of arrow b in the figure) (the second
-Refer to figure B), the groove 12 and the protrusion 13 are unlocked. (See Figure 2-B). Further, by moving the chuck ring 9 forward, the locking portion 11 of the chuck ring 9 is
is locked to the locking portion 8 of the arm portion 7 of the knob 6 (in the direction of arrow c in the figure) (see Figure 2-C). Next, by releasing the finger from the knob 6, the chuck ring 9 and the knob 6 are integrally moved rearward by the elastic force of the knob spring 5 (in the direction of arrow d in the figure). Eventually, when the inclined surface 18b at the rear end of the chuck body 19 comes into contact with the stopper part 20 of the shaft cylinder 1, the chuck body 19
The rear end is pressed by the stopper portion 20 to protrude forward from the chuck ring 9 and expand the head (see Fig. 3-A). At that time, the core is inserted into the core detent member 2
remains in place with its holding power. In addition, the chuck ring 9 that has been moved rearward brings the inclined surface 9a into contact with the release part 14 formed on the shaft cylinder and stops moving, but the knob 6 attempts to move further rearward (arrow f in the figure).
direction). Due to this movement, the lock receiving portion 11 of the chuck ring 9 and the locking portion 8 of the arm portion 7 are released from their locks (see Fig. 4-B). The unlatched chuck ring 9 moves forward by the elastic force of the ring spring 10. Since the chuck ring 9 is always subject to the rotational load of the ring spring 10, the protrusion 13 provided on the chuck ring 9 reliably engages with the groove 12 and returns to its normal state (see Figure 1-C).
In this return process, since the chuck body 19 is holding the core, the core moves forward while being held between the chuck body 19 and is unrolled to a length (fifth
-See figure A).

In addition, in the embodiment described above, the ring spring 1
0 is shown attached to a groove 9b provided in the chuck ring 9 as shown in FIG. 1, but it may also be configured with a stepped portion 21 provided on the outer surface of the chuck ring 9 as shown in FIG. In short, the receiving portion for attaching the ring springs 10, 10' needs only to be constructed so as to always urge the chuck ring 9 in the direction of the groove 12. Furthermore, the locking portion 11 of the chuck ring 9 and the locking portion 8 of the arm portion 7 are
Although two of these are provided at opposing positions in the example, one is essential.

(Effect of the invention) As described above, according to the invention, the chuck ring 9, which is elastically repelled forward while receiving the rotational load of the ring spring 10, locks the protrusion 13 in the groove 12 formed in the shaft cylinder 1. Therefore, the writing load can be reliably received and the lead does not move back, but when the lead is fed out, the lock can be released and the center can be set simply by moving the knob 6 forward. Furthermore, since the ball chuck mechanism is moved rearward, the remaining core can be made as short as possible.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention.
Figures, Figure 1-C, Figure 2-A, Figure 2-B, Figure 2
Figure -C, Figure 3-A, Figure 3-B, Figure 4-A,
Figures 4-B, 5-A, and 5-B are explanatory diagrams of the operation, and Figure 1-B is a sectional view taken along line A-A of Figure 1-A. Figure 6 is a diagram of the ring spring. Longitudinal sectional view, No. 7
The figure is a perspective view of a main part showing another example of attachment of a ring spring. 1... Shaft cylinder, 2... Core detent member, 4...
Hole, 5... Knob spring, 6... Knob, 7...
... Arm part, 8 ... Locking part, 9 ... Chuck ring,
10...Ring spring, 11...Locking receiver,
12...Groove, 13...Protrusion, 14...Release part, 1
9...Chick type, 20...Stopper part.

Claims (1)

[Scope of utility model registration request] In a sharp pencil in which a core detent member and a ball chuck mechanism are installed in the barrel, a chuck ring is provided which is elastically repelled forward while receiving the rotational load of a ring spring, and the chuck ring is provided so as to be slidable on the barrel. It has a locking receiving part that is locked to a locking part in front of the arm of the knob which is resiliently pushed backward by a knob spring, and a locking part that is engaged with a groove formed in the barrel in front of the locking receiving part. When the knob is moved forward, the arm of the knob presses the chuck ring and moves in the circumferential direction to release the lock between the groove and the protrusion, and also to release the lock between the groove and the chuck ring. The locking part is locked, and the locking is released by a release part formed on the shaft cylinder when the knob is moved backward, and a stopper part is formed facing the rear end surface of the chuck body. A centering device for side-sliding sharp pencils.