JP2511745Y2 - 2-core 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 two-core writing instrument in which two refills are accommodated in a shaft cylinder.

[0002]

2. Description of the Related Art A two-core writing instrument, for example, a two-color pen in which a black ink and a red ink are contained in a shaft cylinder and the pen body of the ball-point pen refill is selectively drawn out from a tip opening of the shaft cylinder. A ball-point pen is convenient because it plays the role of two ball-point pens, and is widely used. The pen body feeding mechanism of such a two-color ballpoint pen is
Although various things have been proposed, for example, when a barrel is composed of a front shaft and a rear shaft that are rotatably connected, and when the rear shaft is rotated with respect to the front shaft, the rotation built in the rear shaft It is well known that one of the refills moves forward by the action of the cam and the pen body is extended from the tip end opening of the barrel.

[0003]

However, in the pen body feeding mechanism of such a two-core writing instrument, the front shaft and the rear shaft are rotatably connected and a refill holder is required, so that the number of parts is large. There is a problem that the structure is complicated.
Therefore, an object of the present invention is to provide a two-core writing instrument having a small number of parts, a simple structure, and a simple pen body feeding operation.

[0004]

In order to achieve such an object, the two-core writing instrument of the present invention accommodates two refills elastically ejected to the tail end side by a spring in a barrel, and A cam surface with which the tail end surface abuts is formed at the front end, and a pair of left and right operation parts are rotatably attached to the tail end side of the shaft cylinder and project from the side parts of the shaft cylinder, and press the operation part. When the cam is rotated, one refill advances and the pen body at the tip of the refill is extended from the tip opening of the barrel.

[0005]

The operation of the cam protruding from the side portion of the shaft cylinder is made because the front end of the plate-shaped cam rotatably attached to the tail end side of the shaft cylinder has a cam surface against which the tail end surface of the refill abuts. By pressing and rotating the cam, one pen body can be drawn out from the tip opening of the barrel.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the embodiments shown in the drawings. In FIG. 1, a shaft cylinder 1 made of synthetic resin has a flat shape and has two openings at its tip.
11 are formed. As shown in FIG. 2, the tail end side of the shaft cylinder 1 has a bifurcated shape, and a locking hole 4 is formed in the bifurcated portion.
3 are provided facing each other. Two refills 2 of a ball-point pen of black ink and red ink are accommodated in parallel in the barrel 1 and are repelled toward the tail end side by a spring 3. The refill 2 is not limited to a ballpoint pen.

Locking protrusions 43 are formed on the front and back of the substantially fan-shaped plate-like cam 4, respectively. As shown in FIG.
The locking protrusion 43 is engaged with the locking hole 43 of the barrel 1. That is, the cam 4 is attached to the barrel 1 so as to be rotatable around the locking protrusion 43. A pair of operating portions 42, 42 are provided on both sides of the cam 4, and the operating portion 42 is the shaft cylinder 1
Protruding from the side.

The front end of the cam 4 is a cam surface 41, and the tail end surface of the refill 2 is a cam surface due to the elastic force of the spring 3.
Although it is in contact with 41, the cam surface 41 is
It consists of b and feeding parts 41a at both ends. And refill 2
When the tail end surface of the refill 2 comes into contact with the recessed portion 41b, the pen body 21 at the tip of the refill 2 is recessed into the barrel 1.

The configuration of the two-core writing instrument of the present invention is as described above. The number of parts is small and the structure is extremely simple as compared with a conventional rotary-type two-core writing instrument.

Therefore, when the cam 4 is rotated from the state shown in FIG. 1 until the one operating portion 42 is pressed to come into contact with the side portion of the barrel 1, as shown in FIG.
The tail end surface of the abuts on the feeding portion 41a of the cam surface 41. That is, the refill 2 advances in the process in which the tail end surface of the refill 2 moves from the recessed portion 41b of the cam surface 41 to the feeding portion 41a,
The pen body 21 extends from the tip opening 11 of the barrel 1. Since the feeding portion 41a of the cam surface 41 has a large curvature and is almost flat, the cam 4 does not rotate naturally even when a large writing pressure is applied, and writing is possible.

Further, the other operating portion 42 is pressed to push the barrel 1
It is possible to write with the other refill 2 by bringing it into contact with the side portion of the shaft 1. When both operating portions 42 project from both sides of the barrel 1, the state returns to the state shown in FIG. The pen body 21 sinks into the barrel 1. In this way, the pen body 21 can be selectively withdrawn and withdrawn from the tip end opening 11 of the shaft cylinder 1 only by pressing the operating portion 42 and rotating the cam 4, so that the pen body feeding operation is extremely simple.

[0012]

As described above, in the two-core writing instrument of the present invention, the cam end surface of the refill is in contact with the front end of the plate-like cam rotatably attached to the tail end side of the barrel. When the pen is formed and the cam is rotated by pressing one of the pair of operating portions of the cam projecting from the side portion of the barrel, the pen body is selectively extended from the tip opening of the barrel. A two-core writing instrument having a small number of parts, a simple structure, and a simple pen body feeding operation can be provided.

[Brief description of drawings]

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

FIG. 2 is a side view of an embodiment of the present invention.

FIG. 3 is an operation explanatory diagram.

[Explanation of symbols]

 1 Shaft cylinder 11 Tip opening of the shaft cylinder 2 Refill 21 Refill pen body 3 Spring 4 Cam 41 Cam surface 42 Cam operating part

Claims (1)

(57) [Scope of utility model registration request] 1. A pair of left and right operation parts are provided, in which two refills elastically ejected to the tail end side by a spring are accommodated in a shaft cylinder, and a cam surface with which the tail end faces of the refills abut are formed at the front end. A plate-shaped cam projecting from the side of the shaft cylinder is rotatably attached to the tail end side of the shaft cylinder, and when the operating part is pressed to rotate the cam, one refill advances and the refill moves. A two-core writing instrument, wherein the pen body at the tip extends from the tip opening of the barrel.