JP2513979Y2 - Rotating writing instrument - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary feeding type writing instrument, and more particularly to a rotary feeding type writing instrument having a bottomed straight metal pipe.

[0002]

2. Description of the Related Art A rotary feeding type writing instrument is such that when a rear shaft is rotated forward and backward with respect to a front shaft, a cam barrel fixed to the rear shaft moves a writing body such as a ballpoint pen refill forward and backward. The pen body is projected and retracted from the front end opening of the front shaft. By the way, in writing instruments, design elements are also considered important in addition to the writing function, so that various external designs are designed. However, a simple shape is often adopted as one of the preferable designs, and the front shaft and the rear shaft may both be formed of a straight bottomed metal pipe to form a long and slender writing instrument. In such a rotary feeding type writing instrument, it is necessary to fix the cam cylinder to the rear shaft, but since the rear shaft is made of a metal pipe, it is difficult to fix it with a simple structure. Alternatively, the outer peripheral surface of the rear shaft is recessed to form a stepped portion inside, and the locking portion of the cam cylinder is engaged with the stepped portion. However, bonding with an adhesive has a problem of falling off due to deterioration of the adhesive with time, and also has a problem that the environment of the assembly work environment is deteriorated.If the outer peripheral surface of the rear shaft is recessed to form a step inside, However, there is a problem that the external shape becomes complicated and the simple design is hindered.

[0003]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a rotary feeding type writing instrument capable of securely fixing the cam barrel to the rear shaft with a simple structure when the rear shaft is made of a straight bottomed metal pipe. It is a thing.

[0004]

The structure of the present invention is as follows. The structure of the present invention is a rotary feeding type writing instrument in which a cam cylinder for moving a writing body back and forth is arranged in a rear shaft made of a straight bottomed metal pipe. A fixed ring is press-fitted into the fixed ring, and the cam barrel is fixed to the fixed ring directly or through the fixed barrel.

That is, since the fixed ring is press-fitted into the inner peripheral surface of the rear shaft made of a straight bottomed metal pipe, the same result as that of forming the step portion inside without recessing the outer peripheral surface of the rear shaft is obtained. Simple design will not be hindered. Since the cam cylinder is fixed to this fixed ring directly or via the fixed cylinder, it can be reliably fixed to the rear shaft with a simple structure.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the embodiments shown in the drawings. FIG. 1 shows an example in which the present invention is applied to a rotary feeding type two-color ballpoint pen. In FIG. 1, both the front shaft 1 and the rear shaft 7 are straight bottomed metal pipes, and are thin writing instruments. There is. At the rear end opening of the front shaft 1, there is fixedly fitted a synthetic resin cylinder 3 having two vertical holes therein and having axial side window holes communicating with the vertical holes. . The rear ends of the two ballpoint pen refills 2 accommodated in the front shaft 1 as cursive bodies are inserted into the vertical holes of the cylinder 3. A connecting pin 22 is fixed to the rear end of each ball-point pen refill 2, and an actuator 24 is attached to the rear end of the connecting pin 22.
, And the actuator 24 projects from the side window of the cylinder 3. Further, a spring 23 is interposed between the actuator 24 and the cylinder 3, and the ballpoint pen refill 2 is bulged backward.

A cam profile at the tip of a cam barrel 4 which is formed by cutting a cylinder made of synthetic resin in a substantially diagonal manner is provided with an actuator 2
Although it is in contact with 4, the rotary sliding portion 31 of the cylinder 3 is rotatably engaged with the cam barrel 4. The cam barrel 4 is fixed to the rear shaft 7. To explain this fixing structure, a fixed cylinder 5 made of a metal pipe is fixed to the rear end of the cam cylinder 4 by caulking. In addition, as shown in FIG. 2, an annular fixed ring 6 is press-fitted in the vicinity of the tail end portion in the rear shaft 7, that is, is fixed in the rear shaft 7 without adhering, and the rear shaft 7 The same result as the step is formed in the rear shaft 7 without changing the outer shape of the.
The fixed cylinder 5 is also press-fitted into the fixed ring 6, and the cam cylinder 4 is fixed to the fixed ring 6 via the fixed cylinder 5. The cam barrel 4 may be directly fixed to the fixed ring 6 without using the fixed barrel 5. Further, the present invention is not limited to a two-color ballpoint pen, and may be, for example, a rotary feeding type writing instrument in which a mechanical pencil filling tool is incorporated as a writing body.

When the rear shaft 7 is rotated in the normal and reverse directions with respect to the front shaft 1, the cam barrel 4 fixed to the rear shaft 7 is also rotated in the normal and reverse directions, and the ball-point pen refill 2 causes the spring 23 to repel. The pen body 21 moves forward against
The ballpoint pen refill 2 protrudes from 1 for writing, and the other ballpoint pen refill 2 is retracted by the elastic force of the spring 23, and the pen body 21 is retracted into the front shaft 1.

[0009]

As described above, the rotary feeding type writing instrument of the present invention has a fixed ring press-fitted into the inner peripheral surface of the rear shaft made of a straight bottomed metal pipe, and the writing body is housed in the front shaft. Since the cam cylinder that moves the cylinder back and forth is fixed to the fixed ring directly or via the fixed cylinder, the cam cylinder can be reliably fixed to the rear shaft with a simple structure.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is an enlarged view of part A of FIG.

[Explanation of symbols]

 1 Front Axis 11 Tip Opening of Front Axis 2 Ballpoint Pen Refill (Writing Body) 21 Pen Body 22 Connecting Pin 23 Spring 24 Actuator 3 Cylinder 4 Cam Tube 5 Fixed Tube 6 Fixed Ring 7 Rear Axis

Claims (1)

(57) [Scope of utility model registration request] 1. When a rear shaft made of a bottomed metal pipe straight with respect to the front shaft is rotated forward and backward, a cam cylinder fixed to the rear shaft moves the writing body forward and backward to move the pen body to the front end of the front shaft. A rotary feeding type writing instrument which is projected and retracted from an opening, wherein a fixed ring is press-fitted to an inner peripheral surface of the rear shaft, and the cam barrel is fixed to the fixed ring directly or through the fixed barrel. .