JPH0634155Y2 - Withdrawal mechanism of the shaft tip - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a mechanism for retracting a tip of a shaft body such as a writing instrument such as a ballpoint pen and a mechanical pencil, a cutter, a cosmetic such as an eyeliner, a crayon and the like. In particular, the present invention relates to a retracting mechanism for the tip of the shaft body, which is retracted when the tip end of the shaft body is used and is projected during carrying.

[Prior Art and Problems Therefor] As a clip of a conventional writing instrument, there is a clip in which a base portion is fixed to a rear portion of an outer cylinder. Since this fixed clip projects from the outer cylinder, there is a problem that the clip becomes an obstacle when drawing a line or a character having a uniform thickness while rotating the writing instrument when drawing.

Further, in the conventional example, there is also one in which the base portion of the clip is detachably attached to the outer cylinder, the clip is removed at the time of writing, and the clip is attached at the time of carrying.

The latter conventional example is a so-called detaching method in which the clip is removed from the outer cylinder at the time of writing, so the problem of being an obstacle during writing can be solved, but it is troublesome because the clip must be attached and detached when writing and carrying. However, there is a problem that the outer cylinder may be damaged.

[Means for Solving the Problems]

Therefore, in the present invention, when the clip is pushed and retracted at the time of use, the tip of the shaft body is projected from the outer cylinder at the same time, and when it is carried, the engagement with the cam mechanism is released to allow the clip to project and at the same time the tip of the shaft body is fitted to the outer cylinder. It is intended to provide a retracting mechanism for the tip of the shaft body that can be retracted more.

That is, as shown in FIGS. 1 to 3, the retracting mechanism of the tip of the shaft body of the present invention is provided with a long hole 2 in the outer cylinder 1, and a clip 3 is fitted in the long hole 2 so as to be retractable. An elastic body 6 for urging the mechanism 8 in the rearward direction is inserted in the outer cylinder 1, and the shaft body 4 is supported against the elastic body 6 or by the elastic force of the clip 3 in response to the retracting operation of the clip 3. The cam mechanism 8 for projecting and retracting the tip end portion 7 is provided in the outer cylinder 1, and the cam mechanism 8 is engaged with the front and rear portions of the base portion 9 of the clip 3 and the front and rear portions of the elongated hole 2 of the outer cylinder 1. , The rear engaging portions 10a, 10b, the front and rear engaging portion 1
An engaging hole 11 is provided between 0a and 10b so that the front engaging portion 10a is slidably contacted with the front inclined surface 12 which becomes lower toward the rear, and the front engaging portion 10a provided at the rear portion of the front inclined surface 12 is engaged. The shaft body 4 is linked to a moving portion 15 having a locking portion 13 that stops and a rearwardly inclined surface 14 that engages with the engagement hole 11 and becomes lower toward the rear. Fitting holes 19a and 19b are provided in the portion of the outer cylinder 1 facing the base portion on the side of the engaging portion 10a and the portion of the cam mechanism 8, respectively.
A releasing operation member 20 fitted into the outer cylinder 1 side and abutting on the inner edge portion 19 of the fitting hole 19a on the outer cylinder 1 side is arranged to face the base portion on the front engaging portion 10a side. The cam mechanism 8 is provided with a fitting hole 21 into which the 20 is fitted.

[Action]

When the clip 3 is pushed at the time of use, the cam mechanism 8 operates and the tip portion 7 of the shaft body 4 projects from the outer cylinder 1 against the elastic body 6,
By maintaining the retracted state of the clip 3 by locking the front engaging portion 10a of the clip 3 and the locking portion 13, the protruding state of the tip end portion 7 of the shaft body 4 is maintained.

When carrying the portable device or retracting the tip portion 7 of the shaft body 4, when the releasing operation member 20 is pushed, the base portion of the clip 3 on the front engaging portion 10a side is forcibly pushed and the front engaging portion 10a of the front engaging portion 10a is pushed. The lock is released, the cam mechanism 8 operates, the retracted state of the clip 3 is released, and the clip 3 projects. At the same time, the tip end portion 7 of the shaft body 4 is retracted from the outer cylinder 1 by the elastic force of the elastic body 6.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical sectional view showing the construction of an embodiment of the mechanism of the present invention,
2 (a) and 2 (b) are vertical cross-sectional views of essential parts showing a projected state and a retracted state of the clip of this embodiment, respectively.

In FIGS. 1 and 2 (a) and (b), 1 is an outer cylinder, and 2 is an axially long hole provided in the rear portion of the outer cylinder 1. This long hole 2
A clip 3 is fitted in and retracted from the shaft 3, and a spring 6 is inserted between a spring receiver 17 of a shaft body, for example, a writing shaft body 4 for a ballpoint pen, and a tip 5. Reference numeral 8 denotes a cam mechanism that causes the ball-point pen tip 7 of the shaft body 4 to move in and out in response to the spring 6 against the spring 6 or by the spring force thereof, and is connected between the shaft body 4 and the clip 3.

The cam mechanism 8 includes front and rear portions of the base portion 9 of the clip 3, front and rear engaging portions 10a and 10b, which engage the front and rear portions of the elongated hole 2 of the outer cylinder 1, respectively, in the center of the base portion 9. Is provided with an axial engaging hole 11, a front engaging portion 10a is slidably contacted, and the front inclined surface 12 is lowered toward the rear, and the front engaging portion 10a provided at the rear portion of the front inclined surface 12 is locked. Engaging portion 13 and engaging hole 1
Rear slope 14 that engages 1 and becomes lower toward the rear
And one of the insertion holes 18a, 18b capable of coping with the two types of shaft bodies 4 having different outer diameters, in the front portion of the moving portion 15 having the protrusion 16 provided on the rear side of the rear inclined surface portion 14. The rear portion of the shaft body 4 is joined to 18a by fitting.

Fitting holes 19a and 19b are provided in a portion of the outer cylinder 1 facing the base portion on the side of the front engaging portion 10a locked to the locking portion 13 and a portion of the moving portion 15 of the cam mechanism 8, respectively. This moving part 1
The releasing operation member 20 fitted into the fitting hole 19a on the 5 side and abutting on the inner edge portion 19 of the fitting hole 19a on the outer cylinder 1 side is the front engaging portion.
It is arranged to face the base portion on the 10a side. The fitting hole 21 into which the releasing operation member 20 is fitted is formed in the moving portion 15 of the cam mechanism 8.
It is provided in.

When the front part of the clip 3 is pushed during use in the above structure, the front engaging part 10 provided on the base part 9 of the clip 3 is pushed.
a and the engaging hole 11 are the front inclined surface 12 and the rear inclined surface 14, respectively.
The moving portion 15 and the ball-point pen writing shaft body 4 move forward against the spring 6 by this pushing, and this movement causes the releasing operation member 20 to separate from the fitting hole 21 of the moving portion 15, and The ballpoint nib 7 of the shaft body 4 projects from the tip 5. At this time, the front engaging portion 10a is fitted into the fitting hole 19b through the front inclined surface 12, is locked by the locking portion 13, and the clip 3 is maintained in the retracted state (see FIG. 2 (b)). ).

Also, when carrying the ball-point pen writing shaft body 4 or when retracting the ball-point pen tip 7 of the ball-point pen writing shaft 4, when the release operation member 20 is pushed, the front engaging portion 10a is pushed and disengaged from the locking portion 13 and the front inclined surface 12 is pushed.
The moving portion 15 moves slightly forward against the spring 6, the writing force of the ballpoint pen 4 and the moving portion 15 move backward by the spring force of the spring 6, and the clip 3 is projected by this movement. It will be. In this case, the movement of the moving portion 15 to the rear can be achieved by the release operation member 20 entering into the fitting hole 21 of the moving portion 15.

In this case, the protrusion 16 is provided on the rear side of the rearward inclined surface 14, but when the protrusion 16 is pushed to the rear portion of the clip 3,
It is preferable that the base portion 9 of the clip 3 is brought into contact with and the engagement between the front engagement portion 10a and the engagement portion 13 of the fitting hole 19b can be smoothly released by the lever principle.

Further, in the front portion of the moving portion 15 of the cam mechanism 8 which engages with the shaft body 4, fitting insertion holes 18a and 18b capable of coping with two kinds of shaft bodies having different outer diameters are provided as shown in the first illustration. Therefore, if the outer diameter of the shaft body 4 to be used is large, insert the insertion hole 18b into the shaft body 4
When the outer diameter is small, the fitting insertion hole 18a can be selected to connect the shaft body to the fitting insertion hole, and it is possible to cope with shaft bodies having different outer diameters.

According to the present embodiment, in use (when writing), the front portion of the clip 3 is pushed against the spring 6 to actuate the cam mechanism 8 to retract the clip 3 and at the same time, the ballpoint nib of the writing pen body 4 for a ballpoint pen. 7 can be made to project from the tip 5 of the outer cylinder 1, and the front state of the clip 3 and the state of the ballpoint nib 7 of the writing shaft 4 depending on the front engagement part 10a and the locking part 1 of the clip 3 can be determined.
By maintaining the engagement of 3, the clip 3 does not get in the way, and not only can writing, but also when carrying or when retracting the ballpoint nib 7 of the writing shaft body 4,
By pushing the releasing operation member 20, the base portion on the front engaging portion 10a side is pushed and disengaged from the locking portion 13, or the rear portion of the clip 3 is pushed to operate the cam mechanism 8 by the spring force of the spring 6. When the clip 3 is released and the clip 3 is projected, the ballpoint nib 7 of the writing shaft 4 can be retracted from the tip 5 of the outer cylinder 1, and the clip 3 can be held in a pocket or the like for carrying. be able to. Also,
Since this embodiment can be configured with three parts of the clip 3, the moving part 15, and the releasing operation member 20 (all are plastic molded parts), the number of parts can be reduced as compared with the conventional rotary cam mechanism. It can be implemented at low cost.

Further, a fitting insertion hole capable of coping with a plurality of shafts 4 having different outer diameters is provided in the front part of the moving portion 15 of the cam mechanism 8 coupled to the shaft 4.
Since 18a, 18b ... are provided, a fitting insertion hole can be selected according to the outer diameter of the shaft body 4, and the shaft body can be coupled to the fitting insertion hole, and the outer diameter can be increased without increasing the number of parts. It is possible to cope with the use of a plurality of different shafts.

Since the shaft body 4 is constantly pushed backward by the spring 6, the moving portion 1 does not need to be provided with the fitting insertion holes 18a, 18b.
The end face of 5 may be directly contacted, or the shaft body 4 and the moving portion 15 may be integrally formed.

When the ballpoint pen tip 7 of the ballpoint pen writing shaft 4 is projected or retracted, the clip 3 is pushed to lock the front engaging portion 10a of the clip 3 to the locking portion 13 of the cam mechanism 8, and the releasing operation member 2
Since 0 can be pushed to release the engagement between the engagement portion 13 and the front engagement portion 10a, it can be performed extremely reliably and easily.

Further, by providing a protrusion 16 at the rear portion of the cam mechanism 8, a portion of the rear portion of the cam mechanism 8 facing the outer cylinder 1 and at least one position on the lower surface of the clip 3, the retracting operation of the clip 3 can be performed smoothly and reliably. It can be carried out. Since the cam mechanism 8 is provided with the fitting hole 19b into which the front engaging portion 10a is fitted, the protruding state of the tip end portion 7 of the shaft body 4 can be maintained more reliably, and the clip 3 can be vertically moved. Since the stroke can be increased, operability can be improved.

3 (a) and 3 (b) are vertical cross-sectional views of a main part showing a projected state and a retracted state of a clip of another embodiment, respectively. In this embodiment, the end portion of the releasing operation member 20 is outside. This is an example in which it is made to project from the outer surface of the cylinder 1 and pushed to the rear portion of the front engaging portion 10a of the clip 3.

In this embodiment, the case of the writing shaft 4 for a ballpoint pen has been described, but it goes without saying that the present invention can be applied to the case of a mechanical pencil shaft, a cutter, an eyeliner, a crayon, and other shafts.

[Effect of device]

As is apparent from the above description, according to the present invention, by pushing the clip 3 during use, the retracted state of the clip 3 and the protruding state of the tip portion 7 of the shaft body 4 can be maintained, so that the clip 3 interferes. However, the tip portion 7 of the shaft body 4 can be used. When carrying or when retracting the tip end portion 7 of the shaft body 4, the releasing operation member 20 is pushed to release the retracted state of the clip 3 so that the clip 3 is projected and at the same time the tip end portion 7 of the shaft body 4 is moved to the outer cylinder. It can be retracted from 1, and the clip 3 can be held in a pocket or the like for carrying.

On the other hand, in the conventional writing instrument with a clip, the clip always protrudes regardless of the protruding / withdrawing of the tip, so if you forget to retract the tip and carry the clip in a pocket etc. with the tip protruding, There was a risk that the tip and the like would stain the pocket and the like. In particular, in the case of water-based ballpoint pens, the ink viscosity is lower than that of oil-based ink, so it is not limited to only stains on the contact parts such as the tip and pockets. Could increase and become irreversible. In the case of a cutter, it may damage the pockets, etc.
The risk of injury was particularly high, but in the present invention, the clip 3 does not project unless the tip is retracted. Therefore, the tip 3 should be projected and the clip 3 should be installed in a pocket or the like with the clip 3 retracted. I'm no longer afraid to leave it.

In addition, since the cam mechanism 8 is moved immediately when the clip 3 is retracted and retracted, not only can the tip of the shaft 4 be retracted and retracted smoothly and swiftly and reliably, but the mechanism of the present invention is not limited to the clip 3
Since it can be composed of three parts, the moving part 15 and the releasing operation member 20, the number of parts can be reduced and the cost can be reduced as compared with the conventional rotary cam mechanism.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing the construction of an embodiment of the mechanism of the present invention,
FIGS. 2 (a) and 2 (b) are vertical cross-sectional views of a main part showing a projected state and a retracted state of the clip of this embodiment, respectively.
(A), (b) is a longitudinal cross-sectional view of a main part showing a projected state and a retracted state of a clip of another embodiment, respectively. 1 ... Outer cylinder, 2 ... Long hole, 3 ... Clip, 4 ... (writing for ballpoint pen) Shaft, 5 ... Tip, 6 ... Elastic body (spring), 7 ... Tip (ballpoint pen) 1), 8 ... cam mechanism, 9 ... base part, 10a, 10b ... front, rear engaging part, 11
...... Engagement hole, 12 …… Sloping front surface, 13 …… Locking part, 14 ……
Sloping rear surface, 15 …… moving part, 16 …… stem, 18a, 18b ……
Fitting hole, 19 ... inner edge, 19a, 19b ... Fitting hole, 20 ... Release operation member, 22 ... Fitting hole.

Continuation of the front page (56) Bibliography Hei 1-153289 (JP, U) Hei 63-39592 (JP, U) Hei 63-3487 (JP, U) Japanese public Sho-38-11667 (JP , B1)

Claims (1)

[Scope of utility model registration request] 1. A long hole 2 is provided in an outer cylinder 1, a clip 3 is fitted in the long hole 2 so as to be retractable, and an elastic body 6 for biasing a cam mechanism 8 in a rearward direction is provided in the outer cylinder 1. The cam mechanism 8 for inserting and retracting the tip portion 7 of the shaft body 4 corresponding to the retracting operation of the clip 3 against the elastic body 6 or by its elastic force is provided in the outer cylinder 1, The mechanism 8 includes front and rear engaging portions 10a and 10b at the front and rear portions of the base portion 9 of the clip 3, the front and rear engaging portions 10a and 10b engaging with the front and rear portions of the elongated hole 2 of the outer cylinder 1.
An engaging hole 11 is provided between 0a and 10b, the front engaging portion 10a is slidably contacted, and the front inclined surface 12 becomes lower toward the rear, and the front engaging portion 10a provided at the rear portion of the front inclined surface 12 is engaged. The shaft body 4 is linked to a moving portion 15 having a locking portion 13 that stops and a rearwardly inclined surface 14 that engages with the engagement hole 11 and becomes lower toward the rear. Fitting holes 19a and 19b are provided in the portion of the outer cylinder 1 facing the base portion on the side of the engaging portion 10a and the portion of the cam mechanism 8, respectively.
A releasing operation member 20 fitted into the outer cylinder 1 side and abutting on the inner edge portion 19 of the fitting hole 19a on the outer cylinder 1 side is arranged to face the base portion on the front engaging portion 10a side. A retracting mechanism for the tip of the shaft body, in which a cam mechanism 8 is provided with a fitting hole 21 into which 20 is fitted.