JPS6021268Y2 - Knotsuku style pencil - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a knock-type mechanical pencil that has been improved so that spare leads can be easily replenished.

In conventional knock-type mechanical pencils, when refilling the lead tank with lead, the knob and eraser fitted to the rear end of the lead tank had to be removed one by one.

Therefore, the operation was troublesome, and the removed knobs and erasers were often lost.

For this reason, as a method for replenishing the lead tank without removing the knob and eraser, for example,
No. 337 is known.

In this method, two window holes are provided in each of the shaft and the refill case holding cylinder, and the refill case can be detachably inserted through the window holes.

This structure has the advantage that the refill case can be replaced with a simple structure without removing the knob.

However, the above structure has the following problems.

1) Since the refill case is inserted into the refill case holder, depending on the strength of the fitting force, the refill case may be difficult to insert or may come off easily. The dimensional error between the two is extremely severe, causing a major problem in actual production.

2) Since the refill case is held between a dowel pin and a joint tensioned by a spring, it is fixed inside the shaft and has no elasticity, so the refill case will not break due to vibrations, shocks, etc., or if used. If any looseness occurs during use, the refill case will easily come off.

3) A refill case holding cylinder is required as a component.

This idea improves the various problems mentioned above.
To provide a knock-type mechanical pencil in which leads can be easily replenished without the need to remove a knob and an eraser, and which has good operability and can stably hold a refill case.

The structure of this invention will be explained based on the drawings. In FIG. 1, a tightening ring 2 is fitted onto the head IA of a chuck 1, and the tightening ring 2 is loosely fitted into a concave groove 3A of a connector 3. .

A cap 5 is screwed into the connector 3 via the front inner stage 4A of the shaft 4, and the cap 5 has a built-in core holder 6.

A chuck spring 8 is provided between the connector 3 and a connector 7 fixed to the rear of the chuck 1, and the chuck 1 is normally configured to be pressed against a tightening ring 2 to hold a core 9.

The rear part of the connector 7 has a cone-shaped tapered surface 7A, and a cylindrical support part 7B is formed behind it.A core tank 10 that can be accessed and removed from the support part 7B through a through window 4B provided on the side surface of the shaft 4 is provided at the rear part of the connector 7. The protrusion 10A is inserted.

A core passage hole 10B having a diameter larger than the core diameter is provided approximately at the center of the protrusion 10A of the core tank 10, and a concave locking portion 10D is provided at the rear end 10C of the core tank 10.

The tip 11A of the push rod 11 is attached to the locking portion 10D of the core tank 10.
A shaft spring 12 having an elastic force weaker than that of the chuck spring 8 is provided between the outer flange 11B of the push rod 11 and the rear end inner stage 4C of the shaft 4. Therefore, the core tank 10 It is attached by being sandwiched between the connector 7 and the push rod 11.

An inner flange 4D that can come into contact with the outer flange 11B of the push rod 11 is provided on the inner surface of the shaft 4.

An eraser 14 covered with an eraser case 13 is fitted to the rear inner side 11C of the push rod 11, and a knob 15 is fitted to the rear outer side 11D of the push rod 11 so as to cover the eraser 14.

In the knock-type mechanical pencil configured as shown in FIG. direction), the core tank 10
The protrusion 10A comes off from the support part 7B of the connector 7.

Thereafter, the core tank 10 is held and taken out from the through window 4B.

At this time, since the outer flange 11B of the push rod 11 is brought into contact with the inner flange 4D of the shaft 4, the push rod 11 will not come off.

Next, to explain the case of replenishing and attaching the wick 9 to the wick tank 10, insert the new wick tank 10 containing the wick 9 through the through window 4B of the shaft 4, and push the locking part 10D of the wick tank 10 onto the push rod 1. The core tank 10 can be easily attached by pressing the push rod 11 backward in line with the tip 11A of the : and inserting the protrusion 10A of the core tank 10 into the support part 7B of the connector 7.

If the knob 15 is pressed in the state shown in FIG. 1, the chuck 1 moves forward and the lead 9 is fed out.

FIG. 2 shows another embodiment of this invention, in which two holes 10 facing the support portion 107B of the connector 107 are provided.
7C, and the protrusion 110A of the core tank 110.
A vertical groove 110E is provided to divide the protrusion 110A.
The projections 110F are provided at positions perpendicular to the vertically divided RIIOE.

This core tank 110 is inserted through the through window 104B of the shaft 104, and the core tank 1 is inserted into the support portion 107B of the connector 107.
By inserting the protrusion 110A of No. 10 and further fitting the protrusion 110F of the protrusion 110A into the hole 107C of the support portion 107B, the core tank 110 slides with respect to the connector 107 in the direction of the through window 104B of the shaft 104. possible to be connected.

A locking portion 110D configured as an opening hole is provided at the rear end 110C of the core tank 110, and a push rod 1 is attached to the locking portion 110D.
The tip 111A of the push rod 111 is aligned with the outer flange 11 of the push rod 111.
1B and the rear end inner stage 104C of the shaft 104 is provided with a shaft spring 112 having a weaker elastic force than the chuck spring 108.
is provided.

The outer flange 11 of the push rod 111 is placed at an appropriate position on the inner surface of the shaft 104.
An inner flange 104D that can come into contact with the shaft 104 is provided, and a portion of the core tank 110 protrudes from the through window 104B of the shaft 104, and a clip 16 is integrally formed in this protruding portion.

In the knock-type mechanical pencil configured as shown in FIG. 2, when the lead 109 in the lead tank 110 is finished, when the clip 16 is held and moved forward, the outer flange 111B of the push rod 111 is first moved to the shaft. It comes into contact with the inner flange 104D of 104.

When the clip 16 is further moved forward, the wick tank 1
The tip 111A of the push rod 111 comes off from the locking portion 110D of 10.

By subsequently pulling the clip 16, the rear end 110C of the lead tank 110 protrudes from the through window 104B of the shaft 104, resulting in the state shown in FIG. 4, and the lead 109 is easily replenished from the locking portion 110D of the lead tank 110. .

Next, the lead tank 110 is pushed into the shaft 104, and the tip end 111A of the push rod 111 is aligned with the locking part 110D of the lead tank 110, thereby returning to the state shown in FIG. 2 and becoming ready for writing.

This invention having the configuration and operation described above has the following various effects.

1. Without removing the eraser and knob, the lead tank can be removed from the through-hole of the shaft, or the lead can be easily replenished from the locking part consisting of the opening hole of the lead tank from the through-hole of the shaft.

2. The refill case is held between the connector stretched on the chuck spring and the push rod stretched on the shaft spring, so the cushioning effect of the two springs prevents the refill case from being moved inside the shaft due to shocks, vibrations, etc. The core will not break when shaken.

3. Since the refill case is held by the elastic force of the spring, there is no need to set strict dimensional tolerances between the refill case and the refill case holder within the shaft compared to conventional products, which makes it easier to produce in actual production. The refill case is very good, and there is no chance of it rattling or coming off, causing the refill case to stick out.

4 Furthermore, the refill case can be taken in and out easily, resulting in extremely good operability.

As described above, the present invention has great practical effects compared to conventional pencils.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing a knock-type mechanical pencil of this invention, Fig. 2 is a longitudinal sectional view of main parts showing another embodiment of this invention, and Fig. 3 is a view taken along line X-X in Fig. 2. cross section,
FIG. 4 is a longitudinal sectional view of the main part of the embodiment shown in FIG. 2, showing a state in which the core tank protrudes from the through-hole of the shaft. 1...Chuck, IA...Chuck 1
head, 2... tightening ring, 3... coupling tool, 3A... concave groove of coupling tool 3, 4,104...
...Shaft, 4A...Front inner stage of shaft 4, 4B
, 104 B------ Single shaft 4,104 through window,
4 C, 104C---- Single shaft 4, 104 (7) rear end inner stage, 4D, 104D... Inner flange of shaft 4, 104, 5... Base, 6... ... Core holder, 7
......Connector, 7A...Tapered surface of connector 7, 7B. 107B... Connector 7.107 support part,
107G...Connector 107 hole, 8, 10
8...Chuck spring, 9,109...
... Core, 10.110 ... Core tank, 10A
, 110A...Protrusion of core tank 10, 110,
10B... Core passage hole of core tank 10, IOC,
ll0C... Rear end of core tank 10, 110, I
OD, ll0D...Locking portion of the core tank 10, 110, 110E...Vertical groove of the core tank 110,
110F...Protrusion of core tank 110, 11,1
11...Push rod, IIA, 111A...
Tips of push rods 11, 111, IIB, 111B...
・Outer flange of push rods 11, 111, 11C...Push rod 1
1 rear inner side, 11D... rear outer side of push rod 11, 12, 112... shaft spring, 13...
... Eraser case, 14 ... Eraser, 1
5...knob, 16...clip.

Claims (1)

[Scope of claim for utility model registration] 1. A through window is provided on the side of the shaft, and the protrusion of the core tank is inserted through the through window of the shaft into the support part of the connector fixed to the rear of the chuck, and the protrusion of the core tank is inserted into the rear end of the core tank. A knock-type mechanical pencil characterized in that the tip of the push rod is aligned with a provided locking portion, and a shaft spring is provided between the push rod and the shaft. 2. The knock-type mechanical pencil according to claim 1, wherein the locking portion is configured in a concave shape. 3. The knock-type %-type % according to claim 1 of the utility model registration claim, characterized in that the locking part is configured as an opening hole.