JPH0423032Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a writing instrument in which a cursive pen tip and a clip are made to appear and disappear.

(Prior art) Conventionally, with writing instruments such as ballpoint pens, sharp pencils, and felt-tip pens, the clip does not get in the way of gripping when writing, and when the pen is carried by hanging it in a pocket of clothes, the tip of the pen can stain the clothes. In order to prevent this from happening, there is a known structure in which the writing pen tip and clip are moved in and out by the cam action caused by the relative rotation of the front and rear shafts that make up the barrel (for example, in Japanese Patent Laid-Open No. 57−38200
(see publication). This conventional writing instrument has a configuration in which the pen tip and clip alternately appear and disappear, that is, two states can be selected: the clip is retracted when the pen tip is protruded (when writing), and the clip is protruded when the pen tip is retracted (when carried). I'm familiar with it.

However, with this configuration, the clip always sticks out when the pen tip is recessed, so it lacks a sleek appearance when not writing, and when carrying multiple pens or other writing instruments in a pencil case, etc., the clip always sticks out. Problems remained, such as it was bulky and the clip got in the way of putting in and taking out writing instruments.

(Purpose of the invention) Therefore, the present invention aims to prevent the clip from retracting when the pen tip protrudes.
To provide a writing instrument capable of obtaining a state in which both the pen tip and the clip are retracted, in addition to two states in which the pen nib is retracted and the clip protrudes.

(Structure of the invention) In the present invention, a front shaft and a rear shaft are connected to each other so that they can rotate relative to each other at one end to form a shaft cylinder, and this shaft cylinder has a
The writing body is provided so that it can be moved in the axial direction so that the pen tip can move in and out of the front shaft, and a cam surface in the circumferential direction is provided on one of the front shaft and the rear shaft, and a cursive writing body is provided on the other hand that is movable in the axial direction so as to be in contact with this cam surface. A pen tip ejection/retraction mechanism is provided which transmits the relative rotational force between the front shaft and the rear shaft as an axial movement force to the writing body, and a slider is provided on the cam surface of the pen nib ejection/retraction mechanism. A pen tip retraction section in which the pen tip appears and retracts by moving in the axial direction, and a blank section in which the slider idles relative to the slider while being held in the pen tip retracted position are provided. A clip that is movably introduced and can be retracted; a spring that applies a spring force in the protruding direction to the base of the clip; A rotary cam that rotates is provided, and an engaging body that engages with the rotary cam is provided at the base of the clip, and the rotary cam does not engage the engaging body in a rotating section corresponding to the pen tip protruding and retracting section of the cam surface of the pen tip protruding and retracting mechanism. The clip is restrained and kept in a retracted state, and the engaging body is released in a rotating section corresponding to the blank section of the cam surface, so that the clip is projected by the force of the spring.

With this configuration, two states can be obtained in the pen tip protruding and retracting section of the cam surface of the pen tip protruding mechanism: the pen tip is protruding and the clip is retracted, and the pen tip and the clip are both retracted. A protruding state will be obtained.

(Example) An embodiment of the present invention will be described with reference to the drawings.

Note that the present invention can be applied to various writing instruments such as ballpoint pens, sharp pencils, and felt-tip pens.

Figure 1 shows the pen tip protruding, the clip is recessed, and Figure 3 shows
The figure shows both the pen tip and the clip in the retracted state, and FIG. 5 shows the pen tip in the retracted state and the clip in the protruded state.

Reference numeral 1 indicates a front shaft, and reference numeral 2 indicates a rear shaft. These are connected at one end of each other through a joint cylinder 3 fixed to the front shaft 1 so as to be relatively rotatable, thereby forming a shaft cylinder A. There is. Reference numeral 4 denotes a writing body (the figure shows a ballpoint pen configuration), which is inserted into the shaft barrel A so as to be movable in the axial direction so that the pen tip 4a can move in and out of the front shaft 1. A compression coil spring 6 is provided between this writing body 4 and a spring receiver 5 fixed to the tip inside the front shaft 1, and this spring 6 presses the writing body 4 backward, that is, in the direction in which the pen tip retracts. has been done.

A main cylinder 7 extends from the rear of the front shaft 1 via a joint cylinder 3, and a cam cylinder 8 fixed to the front of the main cylinder 7 through a mounting cylinder 8a within the rear shaft 2 rotates. It is fitted freely. On the front end surface of the cam cylinder 8, as shown in FIG. A cam surface 9 is formed which includes a face portion 9b extending over an area of 180° in the right angle direction. On the other hand, a slider 10 is inserted into the main cylinder 7 in front of the cam cylinder 8 so as to be in contact with the rear end surface of the writing body 4 . This slider 10 has a protrusion 1
1 is provided, and this protrusion 11 is guided out of the main cylinder 7 via a slider guide groove 12 provided in the main cylinder 7 and comes into contact with the cam surface 9. In this state, the protrusion 11 is integrally rotatably connected to the main cylinder 7, that is, the front shaft 1, via the slider guide groove 12,
Moreover, it is possible to move in the axial direction along the guide groove 12. Further, the protrusion 11 is always pressed against the cam surface 9 by the spring force of the coil spring 6 applied via the writing body 4, and the relative rotation between the protrusion 11 and the cam surface 9, that is, the front shaft 1 and the rear shaft 2. The slider 10 moves in the axial direction, and this moving force is transmitted to the writing body 4. In this way, the cam surface 9 and the slider 10 constitute a pen tip retraction mechanism B that converts the relative rotational force between the front shaft 1 and the rear shaft 2 into an axial movement force, transmits it to the writing body 4, and retracts and retracts the pen tip 4a. has been done.

In this case, the pen tip protrusion and retraction operation is performed only in the 180° section (pen tip protrusion section) of the slope portion 9a on the cam surface 9, and the remaining 180° section of the face portion 9b is unrelated to the pen tip protrusion and retraction operation. This becomes an idle space (blank section).

On the other hand, a clip 13 is provided at the rear of the rear shaft 2 so as to be retractable. This clip 13 is attached to the base 1
3a is introduced into the rear shaft 2 through a window hole 14 provided in the rear shaft 2 so as to be movable in the rear shaft radial direction, and by movement of the base portion 13a, the clip 13 is moved into the rear shaft 2 as shown in FIGS. The retracted state as shown in FIG. 5 or the protruding state with the base side protruding outward from the rear axis as shown in FIG. Reference numeral 15 denotes a spring (a leaf spring is shown in the figure) provided between the clip base 13a and the inner surface of the rear shaft. power is given.

The window hole 14 is formed to have a length and width that are almost the same as the entire length and width of the clip 13, so that the clip 13 is almost flush with the outer peripheral surface of the rear shaft (protruding slightly outward) when retracted. condition))
It is adapted to be accommodated in this window hole 14.
Further, a fixed tube 16 is fixed in the rear shaft 2 facing approximately the front half of the window hole 14, and the clip 13 comes into contact with the outer surface of the fixed tube 16 when retracted and extended.
It is gaining support.

The rear part of the main cylinder 7 passes through the fixed cylinder 16, and a rotary cam 17 is fixed to the fixed cylinder penetrating end of the main cylinder 7. A cam groove 1 is provided on the rear surface of this rotating cam 17.
8 is recessed. The cam groove 18 is formed in a crescent shape with one end located on the axis of the rotary cam 17 (shaft cylinder axis), and a cam groove 18 is provided integrally with the clip base 13a so as to protrude forward. A shaft-shaped engaging body 19 is engaged.

The cam groove 18 is formed in the rotation section corresponding to the pen tip protrusion/retraction section (180° section of the slope portion 9a) of the cam surface 9 in the pen tip protrusion/retraction mechanism B, as shown in FIGS. 2 and 4.
As shown in the figure, the end on the rotating cam shaft center side (hereinafter referred to as
From a vertical position where the end (hereinafter referred to as one end) and the opposite end (hereinafter referred to as the other end) are located on the window hole 14 side, to a horizontal position, and then to a vertical position where the other end is located on the side opposite to the window hole 14. Change. In this section, the engaging body 19
Since the clip 13 is supported by one end of the cam groove 18 and is prevented from moving toward the window hole 14, the clip 13 is maintained in the retracted state.

Then, a blank section of the cam surface 9 (face portion 9b
180° section), the cam groove 18
However, the engaging body 19 is released in this section, and the spring 15
It is possible to move within the cam groove 18 in the direction of the window hole 14 by the force of . This allows the clip base 1
3 protrudes from the window hole 14, and the clip 13
It will be in the protruding state shown in the figure.

Note that the fixed cylinder 16 and the rotating cam 17 prevent the front shaft 1 and the rear shaft 2 from being separated via the main cylinder 7. Further, in the figure, reference numeral 20 denotes a tail plug attached to the rear end of the rear shaft, and the front surface 20a of this tail plug 20 is formed into an inclined surface, so that when the clip is projected, the clip base 13a
is guided by this inclined surface 20a and moves in an inclined manner, whereby the clip 13 protrudes in an inclined state.

The protrusion and retraction effects of the pen tip 4a and the clip 13 can be summarized as follows.

In the pen tip protruding state shown in FIG. 1, the protrusion 11 of the slider 10 in the pen tip ejection/retraction mechanism B is located at the front end of the cam surface 9, as shown by the solid line in FIG. Also, at this time, the cam groove 18 of the rotating cam 17
2, the engaging body 19 is in a restrained state and the clip 13 is in a retracted state. Therefore, the clip 13 does not get in the way of gripping when writing.

When the front shaft 1 and the rear shaft 2 are rotated relative to each other from this state (the figure shows a state in which only the front shaft 1 is rotated), the protrusion 11 of the slider 10 touches the slope portion 9a of the cam surface 9. As the writing body 4 moves backward, the protrusion 11 is positioned at the rear end of the slope part as shown by the imaginary line A in FIG. Be immersed (state in Figure 3). At this time, the cam groove 18 is in the vertical position shown by the solid line in FIG. 4, and the engaging body is still in the restrained state.
The clip 13 remains submerged. That is,
Both the pen tip 4a and the clip 13 are in a recessed state. Therefore, if you leave it in this state when you are not writing, it will look sleek and stylish whether you put it on your desk or carry it in a bag, etc., and it will also look good when you carry it in a pencil case, etc. It is not bulky, and the clip 13 does not get in the way of taking things in and out.

Then, when hanging it on a pocket of clothes, etc., it is further rotated relative to each other by 180 degrees from the above-mentioned state in which both are immersed. At this time, the protrusion 11 of the slider 10 moves only in the circumferential direction along the facing portion 9 of the cam surface 9, and for the pen tip ejection/retraction mechanism B, this becomes a blank section that has no relation to the protrusion/retraction of the pen tip. On the other hand, on the clip side, the cam groove 18 changes from the horizontal position shown by the imaginary line in FIG. 4 to the vertical position shown in FIG. It protrudes (as shown in Figure 5). thus,
The pen tip is recessed and the clip is protruding. In this state, by pressing the clip base 13a against the spring 15, the front end of the clip can be opened and the clip can be hung on a pocket or the like.

Further, when the front shaft 1 and the rear shaft 2 are relatively rotated in the opposite direction from this state, the pen tip protrudes and the clip retracts as shown in FIG. 1 after passing through the both retracted state shown in FIG.

By the way, regarding the cam surface of the pen tip ejection mechanism,
In the above embodiment, the cam surface 9 was formed on the front end surface of the cam cylinder 8, but the peripheral wall of the cam cylinder 8 has a helical groove portion corresponding to the slope portion 9a of the above example, and a cam cylinder axis corresponding to the face portion 9b. It is also possible to provide a slot consisting of a groove portion in a perpendicular direction and a rear surface of the slot as a cam surface.
Further, in the above embodiment, the engaging body 1 on the clip 13 side
9 is a protrusion, and the rotary cam 17 is provided with a cam groove 18 in which this engaging body 19 engages, but on the contrary,
A protrusion may be provided on the rotary cam 17 side eccentrically with respect to the cam axis, while an engaging body may be provided on the clip 13 side with a cam groove in which this protrusion engages. Furthermore, in the above embodiment, the clip 13 was made to protrude in an inclined state.
It may also be made to protrude in parallel with.

(Effect of the invention) As described above, according to the invention, the cam surface and
The cam surface of the pen tip retraction mechanism, which is composed of a slider that contacts this cam surface, has a pen tip retraction section that is required for the pen tip to protrude and retract, and a blank section that idles while the slider is kept in the pen tip retracted position. is provided, and the clip is made to protrude by the relative rotation of the front and rear axles in this blank section.
In the pen tip recessed section, it is possible to obtain a state in which both the pen tip and the clip are recessed. That is, in addition to the conventional state where the pen tip is protruding and the clip is retracted, and the state where the pen tip is retracted and the clip is protruding, a new dual recessed state can be obtained. For this reason,
By selecting this dual immersive state when not writing, it has a sleek and good-looking appearance, is not bulky when carried in a pencil case, etc., and is convenient to put in and take out, etc. It has the following effects.

[Brief explanation of drawings]

The figures show an embodiment of the present invention. Figure 1 is a sectional view with the pen tip protruding and the clip retracted. Figure 2 is an enlarged sectional view taken along the lines of Figure 1. Figure 3 is with both the pen tip and clip retracted. 4 is an enlarged sectional view taken from FIG. 3, FIG. 5 is a sectional view of the pen tip retracted and the clip is protruded, FIG. 6 is an enlarged sectional view taken from FIG. It is a developed view of the appearance mechanism. A...Axle cylinder, 1...Front axle, 2...Rear axle, 4...
Cursive writing, 4a... Pen tip, B... Pen tip ejection mechanism, 9... Cam surface, 9a... Slope view of cam surface (pen nib protrusion and retraction section), 9b... Same surface part (blank section), 10 ... Slider, 11 ... Slider projection, 13 ... Clip, 13a ... Clip base, 15 ... Spring, 17 ... Rotating cam, 18 ...
Cam groove, 19...engaging body.

Claims (1)

[Scope of utility model registration request] The front shaft and the rear shaft are connected to each other so that they can rotate relative to each other at one end to form a barrel, and the writing body can be moved in the axial direction so that the pen tip can move in and out of the front shaft. In addition, one of the front and rear axles is provided with a circumferential cam surface, and the other is provided with an axially movable slider that contacts this cam surface, so that the relative rotational force between the front and rear axles can be calculated as described above. A pen tip retraction mechanism is configured to transmit an axial movement force to the body, and a cam surface of the pen nib retraction mechanism includes a pen nib retraction section that moves the slider in the axial direction to project and retract the pen tip;
A blank section is provided in which the slider is rotated idly with respect to the slider while being held in the pen tip retracted position, and on the other hand,
A clip whose base part is introduced into the rear shaft so as to be movable in the rear shaft radial direction and can be retracted; a spring which applies a spring force in the protruding direction to the base of the clip; and a spring facing the clip base. a rotary cam that rotates in conjunction with the cam surface of the pen tip retraction mechanism at a position where the pen tip retracts, and an engaging body that engages with the rotary cam at the base of the clip, the rotary cam In the rotating section corresponding to the pen tip protrusion section on the cam surface, the engaging body is restrained to keep the clip in the retracted state, and in the rotating section corresponding to the blank section on the same cam surface, the engaging body is released to apply the force of the spring to the clip. A writing instrument characterized by being configured so that it twists and protrudes.