JPH051436Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is such that when the writing instrument is used in synchronization with the operation of the feeding mechanism, the leg of the clip sinks into the barrel, or comes into close contact with the outer surface of the barrel. To provide a clip projecting/retracting device for a writing instrument, which is constructed so that it is flush with the outer surface so as not to interfere with use, and when not in use, the clip protrudes and can be clipped into a pocket or the like.

(Problems with the Prior Art) A writing instrument having such a structure is disclosed in Japanese Patent Application Laid-Open No. 57-38200, but since it utilizes a cam action, the structure is complicated and there is a problem in that the operating resistance is large.

In addition, since the lip is attached to a passively actuated member that moves up and down by cam action, the clamping force of the clip depends only on the elasticity of the clip leg rod, so it is difficult to obtain sufficient clamping force, and the leg lever becomes fatigued. There are some easy problems.

(Means for Solving the Problems) As shown in the figure, the present invention has a front shaft and a rear shaft that are rotatably connected to each other in a shaft cylinder, and a cursive writing system is created using a cam action caused by the relative rotation of the shafts. In a writing instrument equipped with a feeding mechanism that moves the pen forward and backward, the pen tip 4' is inserted into the barrel 1.
In the more protruding state (Fig. 1), the rear shaft 3
Spring receiving part 2 of clip 18 loosely fitted inside
2 is urged toward the non-window hole 16 side by a spring 29, and the leg rod 19 is maintained flush with the shaft cylinder 1.

Furthermore, when the pen tip 4' is retracted into the barrel 1 (FIGS. 3 and 4), the sliding member 12 of the delivery mechanism 7 slides backward in synchronization with the operation of the delivery mechanism 7, and 1
A pressing part 15 protruding from the rear end of the clip 1
By pressing the part of the clip base 21 of No. 8 that is offset from the axis toward the window hole 16, the tip of the clip 18 is swung in the direction of protruding from the window hole 16 by lever action, so that it can be clamped into a pocket, etc. By clip 18
is constructed so that it is projected.

(Example) 1 is a shaft cylinder in which a front shaft 2 and a rear shaft 3 are rotatably connected.

Reference numeral 4 denotes a writing body configured as a ballpoint pen or a felt-tip pen, and is urged rearward by a spring 6 whose front end is secured to an inward stepped portion 5 of the front shaft 2.

7 is a feeding mechanism, which includes a fixed cylinder 10 which is fixed to the rear part of the front shaft 2 via a relay cylinder 8 and has a sliding groove 9 formed in the axial direction, and a sliding groove which is slidably and loosely inserted into the rear shaft 3. 9 has an engaging protrusion 11 that fits loosely into the cursive body 4 at the front end.
A sliding member 12 abutting the rear end, and a rotatable engaging protrusion 11 on the outer circumference of the fixed cylinder 10.
It consists of a simple cam 14 having a guide slope 13 for guiding.

Reference numeral 15 denotes a protruding axial pressing portion of the sliding member 12, which is formed at a position offset from the axis toward the window hole 16 by bevelling the member 12.

Reference numeral 17 denotes a locking tube that is fitted and fixed to the rear part of the fixed tube 10 for protection.

The outer diameter of the locking cylinder 17 is smaller than the inner diameter of the rear shaft 3 and larger than the inner diameter of the simple cam 14, and the front shaft 2 and rear shaft 3 are rotatable via the fixed cylinder 10 and the cylindrical cam 14. They are arranged in a continuous manner.

18 is a clip loosely fitted into the rear shaft 3;
A leg rod 19 faces the window hole 16 so as to be flush with the shaft cylinder 1, and a clip base 21 and a spring receiving portion 22 are connected to the rear part of the leg rod 19 via a bent portion 20. It consists of a mounting part 23.

Further, the clip 18 is attached to the pressing portion 15 of the sliding member 12.
is located at the front of the clip base 21, and the feeding mechanism 7
It is arranged so that it can be pressed when the member 12 slides due to the actuation of the member 12 .

Reference numeral 24 denotes a tail plug that is fitted onto the rear axle 3 and is made up of a small diameter part 25 and a large diameter part 26, and the small diameter part 25 located in the window hole 16 has a notch 27 for allowing the leg rod 19 to swing. However, inside there is a lumen part 28 whose front end is open.
is formed. Further, a locking recess 30 for restricting the protrusion of the clip 18 is formed at a position facing the rear end of the spring receiving portion 22 of the inner cavity 28.

29 is a spring attached to the inner cavity 28, one end of which is brought into contact with the spring receiving part 22 of the clip 18, and the spring receiving part 22 is always connected to the non-window hole 16.
It's firing in the direction. The leg rod 19 is maintained flush with the outer surface of the shaft cylinder 1 by the spring 29.

(effect) Next, the operation of the present invention will be explained.

In FIG. 1, the pen tip 4' protrudes from the barrel 1 and is pushed toward the non-window hole 16 by the action of the spring 29 of the clip 18, so that the leg rod 19 is maintained flush with the outer surface of the barrel 1. It does not get in the way of writing.

When the front shaft 2 and the rear shaft 3 are rotated relatively from this state to operate the feeding mechanism 7 and the pen tip 4' is recessed into the shaft barrel 1, the sliding member 12 moves the engagement protrusion 1
1 and the cam action of the cylindrical cam 14 and the spring 6
Due to the restoring action, the pen tip 4' slides backward through the writing body 4 by a set distance necessary for retraction of the pen tip 4'.

Therefore, the pen tip 4' is recessed into the barrel 1.
At the same time, the window hole 1 is
Since the portion biased towards the 6 side is pressed rearward by the pressing portion 15, the clip 18 easily swings rearward using the rear end of the spring receiving portion 22 as a fulcrum against the elastic force of the spring 29 due to the lever action. The front end of the leg rod 19 protrudes from the window hole 16.
(Fig. 3) In this state, insert the writing instrument into a pocket or the like, and insert the writing instrument into the outer surface of the rear shaft 3 and the leg rod 19 protruding from the window hole 16.
When a pocket piece or the like is inserted between the distal ends of the clip 18, the clip 18 protrudes against the elastic force of the spring 29, and the elastic force of the spring 29 clips the pocket or the like. (Fig. 4) When the pinch of the pocket etc. is released, the state shown in Fig. 3 is obtained.If you want to use it for writing from this state, you can rotate the front shaft 2 and the rear shaft 3 relative to each other, and the cam will rotate in the opposite direction. Due to this action, the sliding member 12 slides forward through the writing body 4 against the elastic force of the spring 6.

Therefore, the pen tip 4' is projected and at the same time the pressure on the clip base 21 is released, so that the clip 1
8 is repelled toward the non-window hole 16 by the action of the spring 29 and retracts into the shaft cylinder 1.

In the present invention, although not shown in the drawings, the spring 29 has a relatively weak elastic force, and the other end is fixed by means such as press-fitting into a horizontal groove formed on the window hole 16 side of the inner cavity 28, and one end is attached to the spring 29. A spring with a relatively strong resiliency and a length that does not contact the receiving portion 22 but leaves some space between them is mounted coaxially with the spring 29, so that the sliding member 12 slides rearward. It may be configured such that when the clip 18 swings, one end of the strong spring comes into contact with the spring receiving portion 22.

In this case, since the elastic force of the spring 29 is weak, the clip 18 can be more easily swung, so smoother operation can be expected.

Further, after swinging, a spring with a strong elastic force acts, so that when inserted into a pocket or the like, better clamping force can be obtained.

In addition, in the present invention, the writing body 4 is configured as a sharp pencil. The tail plug 24 may be omitted and the spring 29 may be attached directly to the rear shaft 3. Furthermore, the pressing portion 15 of the sliding member 12 may be formed by implanting a rod at a predetermined position on the rear end of the member 12. Modifications are possible without departing from the gist of the invention.

(Effects of the invention) Since the present invention is constructed as described above, it can be operated smoothly with low operating resistance, and the clamping force of the clip is good because it uses a spring instead of relying only on the leg rod, which reduces fatigue of the leg rod. In addition to preventing this, it is also possible to easily obtain the required clamping force by selecting the spring.

[Brief explanation of the drawing]

Fig. 1 is a partially omitted sectional view of an embodiment of the present invention;
The figures are a sectional view taken along the line a-a in Figure 1, Figures 3 and 4.
The figure is a sectional view of a main part explaining the operation of the embodiment of the present invention. 1... shaft cylinder, 2... front shaft, 3... rear shaft, 4...
Cursive, 7... Feeding mechanism, 12... Sliding member, 1
5... Pressing part, 16... Window hole, 18... Clip, 19... Leg rod, 20... Bent part, 21... Clip base, 22... Spring receiving part, 23...
Mounting part.

Claims (1)

[Scope of utility model registration request] In a writing instrument in which a front shaft and a rear shaft are rotatably connected to each other and a feeding mechanism is installed in the shaft cylinder to move the writing body forward and backward by a cam action caused by the relative rotation of the shafts, the inside of the rear shaft 3 is attached. The leg rod 19 faces the window hole 16 penetrated through the side surface, and the mounting portion has an L-shaped cross section and has a clip base 21 and a spring receiving portion 22 connected to each other via a bent portion 20 at the rear of the leg rod 19. 23 is loosely fitted into the non-window hole 16 at the rear of the clip base 21 and inside the shaft of the spring receiver 22.
A spring 29 that springs on the side is attached, and the sliding member 12 of the feeding mechanism 7 is inserted loosely so as to be slidable in the axial direction, and the member 12 is at a position offset from the axis of the rear end toward the window hole 16 side. An axial pressing portion 15 protruding from the clip base 21 is located at the front of the clip base 21 and is configured to be able to press the biased portion of the clip base 21 on the window hole 16 side in synchronization with the operation of the feeding mechanism 7. A writing instrument clip appearance device characterized by: