JPS592638B2 - Lead retraction device for writing instruments, cosmetics, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a pencil lead extruded when used for writing instruments, cosmetics, etc.
This invention relates to a retraction device that pushes a decorative lead or similar rod-shaped lead deep beyond the extrusion stroke during use, and automatically immerses the protruding lead into the tip. The goal is to increase production efficiency with a simple structure, eliminate breakdowns, and ensure reliable operation.

Below, drawings showing embodiments of the present invention will be described.
Reference numeral 1 denotes a fixed cylinder, and the lower end of a shaft part 2 of a writing instrument or cosmetic implement is screwed onto a threaded part on the outer periphery, and the upper end of a tip 3 is similarly screwed to form a shaft cylinder.

3a* 3b-3c are dog, medium and small diameter holes provided inside the tip 3, and 3d is a shoulder portion for receiving and stopping the downward movement of the lower fastening ring 4.

Reference numeral 5 denotes an elastic body for lightly holding the rod-shaped core 6 passing through the axis, and is inserted and fixed into the medium diameter hole 3b of the tip 3.

The rear end of the shaft portion 2 is open, and a knock portion of a push-down tube (not shown) protrudes from the rear end by a certain dimension as is known in the art. A fixed tube 1 that can be pushed in when retracted, and has a coil spring 7 that locks its lower end to the upper end of the fixed tube 1 and locks its upper end to an appropriate upper part of the push-down tube in order to make these backward movements. A large-diameter hole 8 and a medium-diameter hole 9 are opened from the lower end of the inner central hole, and a shoulder 10 is formed at the boundary between the two.

The lower cotton $4 is inserted into the lower large diameter hole 8, and when it moves up and down, the receiver is stopped by the shoulder 10 and the shoulder 3d of the tip 3 to open and close the chuck 12. The upper cotton @ 13 is inserted into the hole 9, and the upper shoulder 9 at the boundary with the center hole is inserted.
a to position the upper limit of the upper fastening ring 13 by locking the upper end thereof.

The upper fastening ring 13 has a slightly elongated cylindrical shape, and a small-diameter cylindrical part 13a with a small diameter outer circumferential surface is formed at the lower part to a certain length, and the center hole 4a of the lower fastening ring 4 is inserted into the small diameter cylindrical part 13a.
3 and 4 move up and down within the length of the small diameter cylindrical portion 13a.

Further, an external force collar 13b is provided at the lower end of the small diameter cylinder of the upper tightening ring 13, and the lower surface of the inner collar 4b at the upper end of the lower tightening ring 4 is engaged with the lower surface of the inner collar 4b to allow the extension and upper and lower tightening. When the rings 13 and 4 are moved and the tip metal 3 is removed from the fixed cylinder 1, both are prevented from being pulled out.

The upper surface of the internal force flange 4b of the lower clamping ring 4 is locked by the shoulder 13c formed by the small diameter cylindrical part 13a on the upper wire ring 13, thereby preventing excessive fitting with the lower clamping ring 4 during extrusion. To prevent.

In addition, the fitting length of the upper and lower fastening rings 13 and 4 is the length of the lower fastening ring 4.
The lower end is formed to have a length several times as long as the length at which it contacts the shoulder portion 3d of the tip 3.

14 is a chuck tube, and the upper part is a push-down tube (
(not shown), and a lower chuck 12 is provided at the lower end, and an enlarged portion is provided on the upper outer circumferential surface at a certain interval, thereby providing an upper chuck 15.

Normally, when not in operation, the lower chuck 12 is fitted into the lower clamping ring 4 and closed as shown in FIG.
The rod-shaped core 6 is tightened and held.

Further, the upper chuck 15 is located above the upper fastening ring 13, and is fitted into the upper fastening ring 13 and closed when the push-down tube is pushed in to the lowest limit.

The rod-shaped core 6 is pushed out by moving the chuck tube 14 downward in a known manner, and the lower end of the lower fastening ring 4 abuts against the shoulder 3d of the tip 3 to release the lower chuck 12, and then the elastic force of the coil spring 7 The core 6 is pushed out by repeating this movement, which is caused by force.

In the present invention, the upper fastening ring 13 slides on the lower fastening ring 4 in the small diameter cylindrical portion 13a and moves up and down in accordance with the movement of the lower fastening ring 4, and is unrelated to the extrusion of the core 6.

Next, the lead 6 is pulled in by pushing down the push-down tube against the coil spring 7, resting the lower blade clamping ring 4 on the shoulder 3d of the tip 3, and releasing the lower chuck 12 from this clamping ring. Continuing from the core extrusion operation, in the present invention, as shown in FIG. When pushed down, the lower end of the lower fastening ring 4 abuts against the shoulder 3d of the tip 3.

Next, by further pushing the push-down tube, the upper clamping ring 13 clamps the upper chuck 15 as shown in FIG.
The upper chuck 15 is finally tightened by the upper chuck 15, and the lower chuck 12 is thereby also tightened, and the rod-shaped core 6 is clamped by the clamping portion 12a.

Next, when the pressing force of the push-down tube is released, the chuck tube 14 is moved upward by the coil spring 7 in the above state.

At this time, the upper chuck 15 of the chuck tube 14 is
3, the rod-shaped core 6 is moved upward while holding it in place to retract the core.

When the upper clamping ring 13 comes into contact with the shoulder 9a of the medium diameter hole 9 when the chuck tube 14 moves upward, the upper blade chuck 15 is released.

At the same time, the lower fastening ring 4 comes into contact with the shoulder 10 and the lower large diameter hole 8
At the same time, the lower chuck 12 is clamped to create a normal fastening state, and the rod-shaped core 6 is brought into a retracted state as shown in FIG.

The upper clamping ring 13, which is fitted and expandably connected to the lower clamping ring 4 in this way, is not affected in any way during normal core extrusion, and when pushed down to the deepest part, the upper chuck 15 is in a compressed state with the upper clamping ring 13. In other words, the extruded tube moves downward by several times the length of the core extrusion, and when it moves upward under the force of the coil spring, it reaches the most extended position several times the core extrusion length, so it protrudes. The rod-shaped core can be reliably drawn into the interior of the tip.

In addition, since the upper blade fastening ring and the lower fastening ring are connected in series to form a simple pulpit, assembly work can be performed easily, increasing production efficiency, and allowing for light operation without causing breakdowns. It has the characteristics of being able to

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of the main part of the rod-shaped core according to the present invention in a protruding state, Fig. 2 is an explanatory diagram of the process of pushing down the blade clamping ring, and Fig. 3 is a diagram showing the chuck tube at its deepest point. FIG. 4 is a half-sectional view of the state in which the push-down tube is moved upward and the rod-shaped core is retracted from FIG. 3. 1...Fixed cylinder, 4...Lower fastening ring, 6.
... Rod-shaped core, 8 ... Large diameter hole, 9 ...
...Medium diameter hole, 12...Lower blade chuck, 13...
... Upper blade clamping ring, 14 ... Chuck pipe, 15
・・・・・・Upper blade chuck.

Claims (1)

[Claims] 1. A fixed barrel of a writing instrument, etc., which has a holding member for lightly holding the lead inside the tip, has a large diameter hole at the bottom and a medium diameter hole above it, and a shoulder is formed at the boundary between the two. The lower chuck of the chuck tube and the lower clamping ring attached thereto are installed in the large diameter hole with a core extrusion stroke, and the upper clamping ring inserted on the outside of the chuck tube is installed in the upper medium diameter hole. At the same time, a small-diameter cylindrical portion is formed below the upper fastening ring, and the upper end of the lower fastening ring is fitted into the small-diameter cylindrical portion so as to be movable up and down. An upper chuck is integrally formed on the tube to protrude, so that when the chuck tube is pushed down beyond the push-down length of the knock operation suitable for normal window use, the upper clamping ring fits into the upper chuck and can clamp the core. A lead retracting device for writing implements, cosmetic implements, etc., characterized in that it is formed into a.