JP2605614Y2 - Ballpoint pen - Google Patents

Description

[Detailed description of the invention]

[0001]

In the present invention, the operating portion is pressed against the elastic force of the elastic body so that the pen tip of the refill protrudes from the tip of the outer cylinder to maintain the protruding state, and the operating portion is turned. The present invention relates to a ball-point pen capable of releasing a pen tip by moving the pen tip and retracting the pen tip of the refill from the tip of an outer cylinder by the elastic force of an elastic body.

[0002]

2. Description of the Related Art A conventional ballpoint pen of this type is disclosed, for example, in Japanese Utility Model Publication No. 63-37271. In this ball-point pen, a refill urged rearward by an elastic body is inserted into an outer cylinder, a cam housing cylinder is fixed to the inner surface of the outer cylinder, and a rear portion of the refill is inserted into the cam housing. The rotating cam is housed, and a cam rod that slides the rotating cam is housed in the cam housing cylinder and is locked to the step of the cam housing cylinder, and the knocking part is fitted to the cam rod protruding from the step. It is constituted by doing.

[0003]

In the conventional ball-point pen constructed as described above, the number of components of the refill push-out mechanism is not only as large as the three components of the cam storage cylinder, the rotating cam and the cam rod, but also as large as possible. A switching projection is provided on the outer peripheral surface of the rotating cam, an outwardly projecting portion is further provided at the tip of the rotating cam, and a projecting portion is provided on the outer periphery of the cam rod,
A plurality of rotation imparting portions are formed on the inner peripheral surface of the cam housing cylinder,
Each of the rotation applying portions is provided with first and second inclined surfaces for slidingly rotating the switching projection of the rotating cam in the circumferential direction. A step formed between the inclined surfaces and temporarily stopping the sliding and rotational movement of the switching projection of the rotary cam; a projection sliding groove in which the projection of the cam rod slides; A cam groove that slides back in the axial direction and slides the switching protrusion in the axial direction to move the switching protrusion in the axial direction, and a cam groove in which the protrusion of the rotating cam slides. The shape and structure of the cam storage cylinder, the rotating cam and the cam rod are extremely complicated due to the structure that stops the cam and the structure in which the step of the cam rod is engaged with the step of the cam storage cylinder. Therefore, there is a problem that the configuration and assembly of the ballpoint pen become extremely complicated and difficult, and the ballpoint pen becomes extremely expensive.

[0004]

A ballpoint pen according to the present invention is provided on an outer cylinder, a cam cylinder disposed in the outer cylinder, and provided on the outer cylinder and the cam cylinder. A first cooperating mechanism for fixing to the inner surface of the cylinder, and a fitting hole inserted into the cam cylinder fixed to the inner surface of the outer cylinder via the first cooperating mechanism; A cam bar, an operation portion provided on the cam bar and protruding from the rear end of the outer cylinder, and a second portion provided on the cam cylinder and the cam bar for cooperatively connecting the cam bar to the cam cylinder in cooperation with each other. A cooperative mechanism, a refill inserted into the outer cylinder, passing through the cam cylinder, and a rear portion inserted into the insertion hole of the cam bar; and an elasticity disposed in the outer cylinder to bias the refill toward the rear of the outer cylinder. And a notch provided on the cam bar to provide elasticity to the cam bar. .

[0005]

In the ballpoint pen according to the present invention configured as described above, the mechanism for pushing out the refill comprises only a cam cylinder and a cam bar having an extremely simple structure and shape. Not only can the number of parts be reduced as compared with the conventional ballpoint pen, but also an inexpensive ballpoint pen can be provided. In addition, since the cam bar is provided with a cut portion that imparts elasticity to the cam bar, the cam bar can be flexibly deformed and incorporated into the cam cylinder when the cam bar is assembled into the cam cylinder, so that the assembling operation can be performed easily and easily. It can be performed efficiently.

[0006]

FIG. 1 is a longitudinal sectional view showing the configuration of an embodiment of a ballpoint pen according to the present invention, and FIG. The ballpoint pen according to the present invention includes an outer cylinder 1, a cam cylinder 7 disposed in the outer cylinder 1, and a cam bar 9 inserted in the cam cylinder 7.
A refill 3 inserted into the outer cylinder 1 and having a rear portion inserted into the insertion hole 8 of the cam bar 9 through the cam cylinder 7, a leading tool 17 attached to the tip of the outer cylinder 1, A first cooperating mechanism provided on the cylinder 1 and the cam cylinder 7 to cooperate with each other to fix the cam cylinder 7 to the inner surface of the outer cylinder 1; and a cooperative mechanism provided on the cam cylinder 7 and the cam bar 9 to cooperate with each other. And a second cooperating mechanism for movably connecting the cam bar 9 to the cam cylinder 7. The spring 2 is disposed between the spring receiving portion of the refill 3 and the step of the tool 17, and the refill 3 is urged rearward by the spring 2.

The first cooperative mechanism has a locking projection 14 provided on the outer peripheral surface of the cam cylinder 7 and an annular locking groove 13 provided on the inner surface of the rear part of the outer cylinder 1. . Outer cylinder 1 for cam cylinder 7
The cam cylinder 7 is firmly fixed to the inner surface of the rear part of the outer cylinder 1 by being inserted thereinto and engaging the locking projection 14 of the cam cylinder 7 with the annular locking groove 13 of the outer cylinder 1.

The second cooperative mechanism has a cam hole formed in the wall of the cam cylinder 7 and a projection 10 provided on the outer surface of the tip of the cam bar 9. The cam hole provided in the cam cylinder 7 has an axial cam path 4 extending substantially along the axial direction of the cam cylinder 7 and a side cam extending substantially laterally from the axial cam path 4. It is composed of a path 5 and a locking portion 6 located at the rear of the side cam path 5. The tip of the cam bar 9 is inserted into the cam cylinder 7 fixed to the outer cylinder 1 via the first cooperative mechanism, and the projection 10 provided at the tip of the cam bar 9 is formed on the cam cylinder 7. The cam bar 9 is movably connected to the cam cylinder 7 by engaging with the cam hole. As described above, the rear portion is formed by the insertion hole 8 of the cam bar 9.
Since the refill 3 fitted in the cam bar 9 is urged backward by the spring 2, the protrusion 10 of the cam bar 9
Is pressed against the rear edge of the axial cam path 4. still,
In the illustrated embodiment, a pair of cam holes of the second cooperating mechanism are provided at opposing portions of the wall of the cam cylinder 7 (only one cam hole is shown). Corresponding to this, a pair of protrusions 10 of the second cooperating mechanism are also provided at opposing portions of the distal end portion of the cam bar 9. With this configuration, operability can be improved.

A notch 12 is provided at a position opposite to the tip of the cam bar 9 provided with the projection 10 to provide elasticity to the entire tip of the cam bar 9 including the projection 10.
Is provided. An operating portion 11 with a clip 15 protruding from the rear end of the outer cylinder 1 is provided integrally or separately at a rear portion of the cam bar 9. When the operation unit 11 is formed separately from the cam bar 9, it is apparent that the operation unit may be attached to the rear portion of the cam bar 9 by fitting or the like. Further, a cam groove may be provided in the cam bar instead of the cam hole of the cam bar 9.

In the ballpoint pen according to the present invention configured as described above, the user presses the operating portion 11 provided at the rear portion of the cam bar 9 into the outer cylinder 1 against the elastic force of the spring 2. Then, the cam bar 9 moves forward and pushes the refill 3 whose rear part is fitted into the fitting insertion hole 8 of the cam bar 9 forward. As a result, the pen tip 16 of the refill 3 projects from the leading tool 17. . More specifically, as the cam bar 9 advances, the projection 10 of the cam bar 9 pressed against the rear end edge of the axial cam path 4 of the cam hole by the urging force of the spring 2 along the axial cam path 4. Is moved in the direction of the side cam path 5 while being guided, and when the user releases the pressing force on the operation unit 11, the protrusion 10 of the cam bar 9 is released.
Is engaged and locked by the locking portion 6 of the cam hole by the elastic force of the spring 2. As a result, the pen tip 16 of the refill 3 is maintained in a state of being protruded from the tip tool 17, and in this state, the user can use the ballpoint pen for writing.

When the user turns the clip 15 of the operation section 11 in the circumferential direction of the outer cylinder 1 with a finger after writing, the cam bar 9
Of the cam hole is disengaged from the engaging portion 6 of the cam hole, and the spring 2 resiliently moves the cam member through the side cam path 5 of the cam hole toward the rear end of the axial cam path 4. Moving axial cam path 4
And the refill 3 is moved toward the rear end of the outer cylinder 1 by the elastic force of the spring 2. As a result, the pen tip 16 of the refill 3 is retracted into the tip 17. The clip 15 may or may not be provided on the operation unit 11. However, as described above, the pen tip 16 of the refill 3 can be easily retracted into the tip 17 by operating the clip 15. Is provided on the operation unit,
Operability can be improved. Further, in the conventional ball-point pen, when the pen tip of the refill is retracted into the tip, the user has to change the outer cylinder each time. However, in the ball-point pen according to the present invention, the pen point 16 is changed. In the case of being retracted into the tip 17, the tip of the clip 15 is lightly rotated in the circumferential direction of the outer cylinder 1 with a finger while the outer cylinder 1 is being written without changing the outer cylinder 1. Can be easily retracted into the leading tool 17.

Next, the assembly of the ballpoint pen according to the present invention will be described. First, the cam cylinder 7 is press-fitted into the outer cylinder 1 from the rear end of the outer cylinder 1 so that the locking projections 14 of the cam cylinder 7 are fitted and locked in the annular locking grooves 13 of the outer cylinder 1. The cylinder 7 is fixed to the outer cylinder 1. Next, the cam bar 9 is inserted from the rear end of the outer cylinder 1, and the cam bar 9 provided with the cut portion 12 is provided.
The cam bar 9 is pushed into the cam cylinder 7 fixed to the outer cylinder 1 and the projection 10 of the cam bar 9 is engaged with the cam hole of the cam cylinder 7 while the tip of the cam bar 9 is bent.
To be movably connected to. Alternatively, after connecting the cam cylinder 7 and the cam bar 9 first, the assembly of the cam cylinder 7 and the cam bar 9 is inserted into the outer cylinder 1 so that the locking projection 14 of the cam cylinder 7 is The cam cylinder 7 may be fixed to the outer cylinder 1 by fitting and locking in the annular locking groove 13.

In the above conventional example, a substantially cylindrical metal unit body having locking projections and fitting portions inside and outside is used to firmly fix the cam housing cylinder to the inner surface of the outer cylinder. In the ball-point pen according to the present invention, only the engaging means is provided on the outer cylinder 1 and the cam cylinder 7 and no special engaging parts are used. Therefore, according to the present invention, the configuration is correspondingly simple. Not only can be easily assembled, but also an inexpensive ballpoint pen can be provided. Further, since the notch 12 is provided at the tip of the cam bar 9 provided with the projection 10, the tip of the cam bar 9 is easily bent and deformed. Since the cam bar 9 can be inserted into the cam cylinder 7 and the protrusion 10 of the cam bar 9 can be easily engaged with the cam hole of the cam cylinder 7 while being flexibly deformed, the ballpoint pen according to the present invention can be easily assembled. Can be.

After the cam cylinder 7 and the cam bar 9 are assembled in the outer cylinder 1, the refill 3 on which the spring 2 is wound is inserted into the outer cylinder 1 from the front end of the outer cylinder 1, and the rear portion is fitted with the cam bar 9. It fits in the hole 8. Then, the tip 1 of the outer cylinder 1
The assembly is completed by screwing 7.

[0015]

As described above, in the ballpoint pen according to the present invention, since the mechanism for pushing out the refill comprises only a cam cylinder and a cam bar having a very simple structure and shape, according to the present invention, In comparison with the conventional ballpoint pen, a ballpoint pen having a simple structure, a small number of parts, and a low price can be obtained. In addition, since the cam bar is provided with a notch for imparting elasticity to the cam bar, the cam bar is easily assembled to the cam cylinder while the cam bar is bent and deformed when the cam bar is assembled to the cam cylinder, and the projection of the cam bar is connected to the cam cylinder. Can be easily engaged with the cam hole, so that the assembling work efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a configuration of an embodiment of a ballpoint pen according to the present invention.

FIG. 2 is a structural diagram of the ballpoint pen shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer cylinder 2 Elastic body (spring) 3 Refill 4 Axial cam path 5 Side cam path 6 Locking part 7 Cam cylinder 8 Fitting insertion hole 9 Cam bar 10 Protrusion 11 Operating part 12 Cut part 13 Annular locking groove 14 Stop projection 15 Clip 16 Pen tip 17 Tip

Claims (5)

(57) [Scope of request for utility model registration] 1. An outer cylinder (1), a cam cylinder (7) disposed in the outer cylinder (1), and provided on the outer cylinder (1) and the cam cylinder (7) to cooperate with each other. A first cooperating mechanism for fixing the cam cylinder (7) to the inner surface of the outer cylinder (1), and an inner surface of the outer cylinder (1) via the first cooperating mechanism. A cam bar (9) which is inserted into the cam cylinder (7) fixed thereto and has an insertion hole (8); and a rear end of the outer cylinder (1) provided on the cam bar (9). A protruding operating portion (11), provided on the cam barrel (7) and the cam bar (9), cooperate with each other to movably connect the cam bar (9) to the cam barrel (7). And a second cooperating mechanism for inserting the rear part into the fitting hole (8) of the cam bar (9) through the cam barrel (7) which is inserted into the outer cylinder (1). A refill (3) provided, and an elastic body (2) disposed in the outer cylinder (1) and urging the refill (3) rearward of the outer cylinder (1), Notch (12) for giving elasticity to cam bar (9)
Is provided on the cam bar (9). 2. The outer cylinder (1), wherein the first cooperating mechanism comprises the outer cylinder (1).
An annular locking groove (13) provided on the inner surface of the cam barrel (7), and a locking projection (14) provided on the outer surface of the cam cylinder (7);
By engaging these annular locking grooves (13) with the locking projections (14), the cam cylinder (7) is connected to the outer cylinder (1).
The ballpoint pen according to claim 1, wherein the ballpoint pen is fixed to the ballpoint pen. 3. The second cooperative mechanism has a cam hole provided in the cam barrel (7) and a projection (10) provided on an outer surface of the cam bar (9). The cam hole is
An axial cam path (4) extending substantially along the axial direction of the cam cylinder (7); and a lateral cam path (5) extending substantially laterally from the axial cam path (4). ) And a locking portion (6) located at a rear portion of the side cam path (5), wherein the protrusion (10) of the cam bar (9) is engaged with the cam hole. The ballpoint pen according to claim 1 or 2, wherein the cam bar (9) is movably connected to the cam barrel (7). 4. The operation unit (11) includes a clip (15).
The ballpoint pen according to any one of claims 1 to 3, wherein the operation portion (11) is provided integrally or separately with the cam bar (9). 5. The cam hole of the second cooperating mechanism is provided at each of opposing portions of the wall of the cam barrel (7), and the protrusion (10) of the second cooperating mechanism is provided. The ball-point pen according to claim 3, wherein the cam bar (9) is provided at each of opposing portions of an outer surface of the cam bar (9).