JPH0133355Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating writing instrument that protrudes or retracts a writing body through the relative rotational movement of a barrel and an operating barrel.

In conventional writing instruments of this kind, the end surfaces of the barrel and operating barrel come into contact with each other directly or indirectly through a decorative ring fixed to the end of the barrel, creating friction and reducing the smoothness of rotation. Conventionally, attempts have been made to improve the machining accuracy and assembly accuracy of parts in order to solve this problem, but no satisfactory solution has been achieved, and there is also the problem of increased costs. The present invention aims to solve this problem.

In order to achieve the above object, the rotary feeding type writing instrument of the present invention is a writing instrument in which the writing body 5 is protruded or retracted by relative rotation of the operation barrel 7 with respect to the barrel barrel 1, and the writing instrument 5 is attached to the writing instrument and the writing instrument 5 is stopped from rotating. The joint cylinder 2 is fixed to an external screw 9 that screws with the screw 6 and rotates to move the internal screw 6 back and forth, and the joint cylinder 2 can be indirectly rotated with respect to the shaft cylinder 1 through other parts. and 0.05 in the axial direction via the pressurizing spring 14.
The operating cylinder 7 is assembled so as to be movable by 0.2 mm, and the insertion resistance with the joint cylinder 2 is set to be greater than the compression resistance of the pressurizing spring. The connecting cylinder 2 and the operation cylinder 7 are integrally returned to each other by the restoring force of the pressurized spring 14 when the insertion force is released, and the shaft cylinder 1 or The structure is characterized in that a gap 15 of 0.05 to 0.2 mm, which is equal to the moving distance of the connecting tube 2 described above, is created between the intervening component and the operation tube 7.

Embodiments of the present invention will be described below with reference to the drawings. The figure is a sectional view of the entire writing instrument, with the lower half of the center line showing the protruding state of the writing instrument, and the upper half of the center line showing the stored state of the writing instrument. First, a mechanism stop 3 is integrally fixed inside the shaft cylinder 1, and furthermore, the front end of a detent 4 is also integrally inserted into the inner surface of the rear end of the mechanism stop 3. Inside the rear end of the detent 4, an internal screw 6 with a writing body 5 attached thereto is inserted so that it cannot rotate relative to the detent 4 and can only move in the axial direction.
On the other hand, an external thread 9 is connected to the front end of the joint cylinder 2 that connects the shaft cylinder 1 and the operating cylinder 7 through an integrally connected relay cylinder 18.
The rear end of is fixed integrally. The external screw 9 has a threaded portion 20 screwed together with a threaded portion 20′ of the internal screw 6,
Further, a connecting tube 10 is integrally fixed to the inner surface of the front end. An intermediate portion of the detent 4 is located inside the connecting tube 10, and washers 11 and 12 are brought into contact with the front and rear ends of the connecting tube 10. Further, a pressurizing spring 14 is interposed between the washer 11 located at the front end of the connecting tube 10 and the stepped portion 13 of the mechanism stop 3, and a gap 17 is provided between the washer 11 and the mechanism stop 3.
is provided. The connecting tube 10 is rotatable relative to the rotation stopper 4 and is also movable in the axial direction. When the outer screw 9 is rotated with respect to the detent 4, the internal screw 6 screwed into the outer screw 9 is prevented from rotating by the detent 4, so that it moves back and forth in the axial direction. A decorative ring 19 as an intervening component is fixed to the rear end of the shaft tube 1. When fixing the joint cylinder 2 to the above-mentioned relay cylinder 18, a gap 16 of 0.05 to 0.2 mm is provided between the front edge of the joint cylinder 2 and the decorative ring 19. 16 in the axial direction. Incidentally, the gap 17 provided between the washer 11 and the mechanical stopper 3 is set to be larger than this gap 16. The connecting cylinder 2 is inserted into the operating cylinder 7, and the insertion resistance is due to the above-mentioned pressurizing spring 14.
The compression resistance is set to be larger than the compression resistance of Therefore, when the connecting cylinder 2 and the operating cylinder 7 are inserted, the pressurizing spring 14 is naturally compressed. The connecting cylinder 2 and the operation cylinder 7 are inserted and attached by compressing the pressurizing spring 14 and inserting the connecting cylinder 2.
After moving by 0.05 to 0.2 mm and coming into contact with the decorative ring 19, the operation is continued until the end face of the operating cylinder 7 comes into contact with the end face of the shaft cylinder 1 via the decorative ring 19, and then the insertion force is released. When this insertion force is released, the pressurizing spring 14 is restored and the joint tube 2 is returned to its original position, but at this time, since the operation tube 7 is also integrated with the joint tube 2, it is returned together by the distance traveled by the joint tube 2. Therefore, a gap 15 of 0.05 to 0.2 mm is created between the operating barrel 7 and the decorative ring 19, that is, between the operating barrel 7 and the shaft barrel 1.

In addition, in the above embodiment, the joint cylinder 2 and the decorative ring 19
The gap 16 between the washer 11 and the mechanical stopper 3 was set to 0.05 to 0.2 mm, and the gap 17 between the washer 11 and the mechanical stopper 3 was set to a larger value. Of course, an embodiment in which the gap 16 between the joining tube 2 and the decorative ring 19 is set to 0.2 mm and the gap 16 between the joint cylinder 2 and the decorative ring 19 is set to be larger than that is also possible. Further, in the above embodiment, the decorative ring 19 as an intervening part is arranged between the shaft cylinder 1 and the operation cylinder 7, but an embodiment without this intervening part is also possible.

As described above, the present invention makes it possible to always provide a certain gap between the relatively rotating shaft cylinder and the operating cylinder, so when the writing is protruded or stored, the end surfaces of the shaft cylinder and the operating cylinder are directly or interposed. Operability is improved because there is no indirect contact between parts that causes friction and impairs the smoothness of rotation, and also contributes to cost reduction because parts processing and assembly do not require strict precision. It has the effect of

[Brief explanation of the drawing]

FIG. 1 is an overall sectional view showing an embodiment of the rotary feeding type writing instrument of the present invention. 1...Shaft tube, 2...Joining tube, 3...Mechanism stop,
4... Anti-rotation, 5... Cursive, 6... Internal screw,
7... Operation tube, 9... External thread, 10... Connection tube,
11, 12... Washer, 13... Step part, 14
...Pressure spring, 15, 16, 17... Gap, 18
... Relay tube, 19 ... Decorative ring, 20, 20'
...Screw part.

Claims (1)

[Scope of utility model registration request] In a writing instrument in which the writing body 5 is protruded or retracted by relative rotation of the operation tube 7 with respect to the barrel 1, the writing body 5 is attached and rotated by screwing into the internal screw 6 which is stopped from rotating, thereby moving the internal screw 6 back and forth. The joint cylinder 2 is fixed to the external screw 9 that is to be moved, and the joint cylinder 2 is indirectly rotatable with respect to the shaft cylinder 1 through other parts, and 0.05 to 0.2 mm in the axial direction through the pressurizing spring 14.
The operation tube 7 is assembled so as to be movable by 1, and the insertion resistance with the joint tube 2 is set to be greater than the compression resistance of the pressurizing spring. The joint cylinder 2 and the operation cylinder 7 are integrally returned to each other by the restoring force of the pressurized spring 14 when the insertion force is released by inserting the parts until they come into indirect contact with the shaft cylinder 1 or the intervening parts. Operation tube 7
A rotary feeding type writing instrument characterized in that a gap 15 of 0.05 to 0.2 mm, which is equal to the moving distance of the joint cylinder 2, is created between the two.