JPH08164699A - Telescopic writing instrument - Google Patents

Abstract

PURPOSE: To provide a structure having excellent assembling properties by providing an oblique groove inclined with respect to the axial direction at the one part of an inner cylinder, and providing a first protrusion, etc., movably engaged with the groove at the other part. CONSTITUTION: When a rear shaft 6 is advanced with respect to a front shaft 1, the protrusion 5a of an inner cylinder 4 presses the front wall of an oblique groove 2b, and hence a lead cylinder 2 is rotated, a second protrusion 3b is retracted by the cam oblique surface 2c of the cylinder 2, and a slider 3 is retracted. Simultaneously, a ballpoint pen refill 9 energized rearward by a coiled spring 10 is retracted according to the slider 3, and finally a first protrusion 4a is disposed at the front end of the groove 2b, the protrusion 3b is disposed at the rear site of the rear end of the surface 2c, and a barrel is shortened by the axial component of the groove 2b. Then, a writing unit 9a of the refill 9 is retracted by the axial component of the surface 2c, and immersed in a base 7.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention is convenient when writing, when the writing portion projects from the tip of the shaft and extends the length of the shaft to a length that is easy to grasp, and when not writing, the writing part is the shaft. The present invention relates to an improvement of a telescopic writing instrument that is immersive inside and has a compact axial length that is convenient for carrying.

[0002]

2. Description of the Related Art As a conventional example of a retractable writing instrument of this type, there are a retractable ballpoint pen disclosed in JP-A-60-199699 and a ballpoint pen described in JP-B-47-5660. However, the former retractable ballpoint pen has a drawback that it adversely affects the magnetic card when it is stored in a pocket, bag, etc. because it has a built-in magnet in order to fix it with the axial length shortened. The latter ball-point pen uses a swing cam to expand and contract its axial length, and therefore has the drawback that it cannot take a sufficient expansion / contraction stroke. Therefore, for the purpose of solving the above problems, the applicant has proposed a retractable writing instrument in Japanese Utility Model Laid-Open No. 16387/1991.

[0003]

DISCLOSURE OF THE INVENTION The present invention is based on the above-mentioned actual Kaihei 1
It is a further improvement based on Japanese Patent Laid-Open No. 16387, and has a structure that is easy to assemble and can be provided at low cost.

[0004]

The telescopic writing instrument of the present invention devised to achieve the above-mentioned object has a lead cylinder, on which a lead cylinder is attached so as to be rotatable in the circumferential direction and immovable in the axial direction, or,
The slider is attached to the front shaft so that it cannot rotate in the circumferential direction and is movable in the axial direction in conjunction with the cursive body, and the rear shaft can move in the axial direction and cannot rotate in the circumferential direction. A first projection that is provided with a slant groove that is inclined with respect to the axial direction in one part of the lead cylinder or the rear shaft itself or the inner cylinder that is fixed to the rear shaft, and that is slidably fitted in the other part in the other part. And a cam slope that is inclined with respect to the axial direction is provided on one component of the lead cylinder or the slider, and a second protrusion that is movable with the rotation of the lead cylinder is provided on the other component while contacting the cam slope. Writing in conjunction with the extension of the axial length by the relative movement of the cam bevel and the second protrusion accompanying the rotation of the lead tube caused by the relative movement of the inclined groove and the first protrusion due to the forward or backward movement of the rear shaft with respect to the front shaft. The writing part of the body can be projected from the tip of the shaft In conjunction with the reduction of Rutotomoni axial length and makes it possible immerses writing section cursive inside the shaft.

[0005]

1 to 11 show an embodiment of the present invention. First, as shown in FIGS. 1 and 8, an axial vertical groove 1a is provided on the rear inner surface of the front shaft 1, and two slits 1c are formed on the outer peripheral portion near the rear end. Part 1c
At the rear end, as shown in FIG. 9, a receiving seat 1 appropriately bulged inward.
d is formed. Further, as shown in FIG. 10, a rib 1b is formed on the outer periphery of the rear end portion so as to be fitted in the vertical groove 6a of the rear shaft 6 and to be only rotatable.

3 to 5 show the lead tube 2.
As shown in the drawing, a circular brim-shaped locking portion 2a having a slope on the front surface is formed on the outer peripheral portion of the front end of the lead tube 2, and a slant groove 2b is formed from the rear side to the rear end. . or,
In the front inner hole of the lead cylinder 2, as shown in the drawing, a cam slope 2c
A long flat front portion 2e and a short flat rear portion 2f are formed.

FIG. 6 shows the slider 3. As shown in the drawing, a rib 3a is formed on the front end of the outer peripheral portion of the slider 3, a protrusion 3b is formed on the outer peripheral portion of the shaft portion behind the slider 3, and a protrusion bulging circumferentially is further formed on the outer peripheral portion of the rear end. The portion 3c is formed. The locking portion 3c may be formed as a ridge. Further, as shown in FIG. 1, a partition wall 3d having a through hole is formed in the inner hole of the slider 3, and a front hole portion is formed in a state where a rear end of a ballpoint pen refill 9 described later abuts on the partition wall 3d. Be attached to. It should be noted that the hole portion is provided with an engaging portion into which the refill is fitted, if necessary.

FIG. 7 shows the inner cylinder 4. As shown in the drawing, a rib 4b is formed in front of the outer peripheral portion of the inner cylinder 4. An inwardly projecting first protrusion 4a is formed on one side of the front end of the inner hole. Further, as shown in FIG. 1, the rear shaft 6 has a longitudinal groove 6a formed in a side wall of the inner hole and extending rearward from a substantially front end, and the front end is formed in a closed shape to form a step portion 6b.

As described above, the rear end of the engaging portion 2a provided on the outer surface of the front end of the lead cylinder 2 is elastically press-fitted so as to come into contact with the receiving seat 1d of the front shaft 1, and the front end of the lead cylinder 2 is attached to the front shaft. 1, the lead cylinder 2 is substantially immovable in the axial direction relative to the front shaft 1 but is rotatably mounted in the circumferential direction, and the rib 3a provided on the outer surface of the front end of the slider 3 is provided. The slider 3 is fitted in the longitudinal groove 1a of the front shaft 1 so that the slider 3 cannot rotate in the circumferential direction but is movable in the axial direction with respect to the front shaft 1, and the slider 3 has a ball-point pen refill as a writing body in the hole. 9 is stored in a state of being biased rearward by a coil spring 10 and the rear end of the ballpoint pen refill 9 is separated by a partition wall 3d.
Contact.

On the other hand, the inner cylinder 4 is fitted in a substantially middle inner hole portion of the rear shaft 6. As shown in FIG. 11, the inner cylinder 4 has a rib 4b fitted in the vertical groove 6a so that it cannot rotate with respect to the rear shaft 6.
Further, the shaft portion 5a of the crown 5 is fixed to the rear end hole of the rear shaft 6 by contacting the rear end of the inner cylinder 4. A clip 5b is formed on one side of the crown 5.

The rib 1b provided on the outer surface of the front shaft 1 is elastically fitted into the axial longitudinal groove 6a provided on the outer surface of the rear end of the front shaft 1 on the rear end of the front shaft 1. Is mounted so as to be movable in the axial direction and non-rotatable in the circumferential direction, and has an axial component and a circumferential component on the outer surface of the lead cylinder 2 described above, that is, is inclined at a required angle with respect to the axial direction. By inserting the first projection 4a provided on the inner surface of the inner cylinder 4 near the front end into the slant groove 2b and inserting the lead cylinder 2 into the inner surface portion of the inner cylinder 4, the first projection 4a is slid into the slant groove 2b. As shown in FIGS. 3 and 5, the lead cylinder 2 is movably fitted and is provided on the outer peripheral surface of the shaft portion of the slider 3 on a cam slope 2c inclined in the direction opposite to the slope groove 2b. Second protrusion 3b
Are set in contact with each other to set a desired stroke of the ball pen refill 9 of the cam slope 2c with a circumferential component equal to the circumferential component of the required expansion / contraction stroke of the oblique groove 2b. It consists of

12 and 13 show other embodiments, respectively, which are basically the same as the above embodiments. The difference is that in the previous example, the rear shaft 6 is elastically fitted with the rib 1b provided on the outer surface portion of the front shaft 1 in the vertical groove 6a provided on the rear end outer surface portion of the front shaft 1. The rear shaft can be inserted from the front side of the above to facilitate the assembly.
In this case, after inserting the rear shaft into the front shaft, the inner cylinder is fixed to the rear shaft.

[0013]

The operation will be described based on the above embodiment. FIG. 1 shows a state in which the rear shaft 6 is retracted with respect to the front shaft 1 and the axial length is extended. The first protrusion 4a of the inner cylinder 4 is located at the rear end of the oblique groove 2b of the lead cylinder 2, and The second protrusion 3b of the slider 3 is located at the front portion 2e which is the front end of the cam slope 2c of the lead tube 2 and is fixed with the writing portion 9a of the ballpoint pen refill 9 protruding from the tip end 7a of the base 7. There is. This state is of course a writing state.

When the rear shaft 6 is moved forward with respect to the front shaft 1 from this state, the first projection 4a of the inner cylinder 4 pushes the front wall of the oblique groove 2b, so that the lead cylinder 2 rotates and the lead cylinder 2 rotates. By the cam slope 2c of the lead tube 2, the second protrusion 3b is retracted, the slider 3 is retracted, and at the same time the coil spring 10
The ball-point pen refill 9 urged backward by the slider 3 retreats according to the slider 3, and finally the first projection 4a is located at the front end of the slant groove 2b and the second projection 3b is located at the rear end 2f of the cam slope 2c. The axial length is shortened by the axial component of the slant groove 2b, and the writing portion 9a of the ball-point pen refill 9 is retracted by the axial component of the cam slant surface 2c and retracts into the base 7. When the rear shaft 6 is pulled rearward with respect to the front shaft 1, the state shown in FIG. 1 is restored again.

In the above embodiment, the inner cylinder 4 is fixed to the rear shaft 6 and the first projection 4a is provided on the inner cylinder 4. However, the first projection 4a is provided directly on the rear shaft itself. However, the action does not change. In the above embodiment, the lead cylinder 2 is provided with the inclined groove 2b and the cam inclined surface 2c, and the inner cylinder 4 is provided with the first projection 4a and the slider 3 is provided with the second projection 3b. The lead cylinder is provided with the first projection on the inner cylinder, the cam slope is provided on the slider, and the second projection is provided on the lead cylinder, or
The slant groove is provided on the inner cylinder, the first projection is provided on the lead cylinder, the cam slant surface is provided on the lead cylinder, and the second projection is provided on the slider. Alternatively, the slant groove is provided on the inner cylinder and the first projection is provided on the lead cylinder. It is also possible to provide the cam slopes on the slider and the second protrusions on the lead tube, respectively.

[0016]

The present invention is as described above, and has an effect of eliminating the drawbacks of the above-mentioned actual Kaihei 1-16387. That is, the engagement between the first protrusion and the inclined groove, the engagement between the second protrusion and the inclined surface of the cam,
There is an effect that the retractable writing instrument can be manufactured at low cost because the assembly structure such as the engagement of the tip shaft and the lead tube becomes easy.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention in a state where the axial length is extended.

FIG. 2 is a vertical cross-sectional view in a state where the axial length is shortened.

FIG. 3 is a vertical cross-sectional view of a lead tube used in an example.

FIG. 4 is a perspective view of a lead tube.

FIG. 5 is a developed plan view showing a slant groove and a cam slant surface of the lead tube.

FIG. 6 is a perspective view of a slider used in the embodiment.

FIG. 7 is a perspective view of an inner cylinder used in the embodiment.

8 shows a cross section taken along the line AA of the front shaft and the slider portion in FIG.

9 shows a BB cross section of the front shaft portion in FIG. 1. FIG.

10 shows a CC cross section of the front shaft and the rear shaft in FIG.

11 shows a DD cross section of the rear shaft and the inner cylinder in FIG.

FIG. 12 is a vertical sectional view showing another embodiment of the retractable writing instrument.

FIG. 13 is a vertical sectional view showing still another embodiment of the retractable writing instrument.

[Explanation of symbols]

 1 front shaft 1a vertical groove 1b rib 1c slit part 1d receiving seat 2 lead tube 2a locking part 2b oblique groove 2c cam slope 2d locking part 2e front part 2f rear part 3 slider 3a rib 3b second protrusion 3c locking part 4 Inner cylinder 4a 1st protrusion 4b Rib 5 Crown 5a Shaft 5b Clip 6 Rear shaft 6a Vertical groove 6b Step 7 Base 7a Tip 8 Rubber grip 9 Ballpoint pen refill 9a Writing 10 coil spring

Claims (3)

[Claims] 1. A lead cylinder is attached to a front shaft so as to be rotatable in the circumferential direction and immovable in the axial direction, and a slider is also not rotatable in the circumferential direction and is interlocked with a writing body in the axial direction. The rear shaft relative to the front shaft so that it can move in the axial direction and cannot rotate in the circumferential direction, and is attached to the lead cylinder or the rear shaft itself or one part of the inner cylinder fixed to the rear shaft. A slant groove inclined with respect to the axial direction is provided, and a first projection that is movably fitted in the slant groove is provided on the other part, and a cam slant surface inclined with respect to the axial direction is provided on one part of the lead tube or the slider. A second projection is provided on the other part, which comes into contact with the cam slope and is movable as the lead tube rotates, and the relative movement of the oblique groove and the first projection due to the forward or backward movement of the rear shaft with respect to the front shaft. Slope and the second protrusion due to the rotation of the lead tube caused by By the relative movement of, the writing part of the writing body can be projected from the tip of the shaft in conjunction with the extension of the axial length, and the writing part of the writing body can be immersed in the shaft in conjunction with the shortening of the axial length. Telescopic writing instrument characterized by. 2. The retractable writing instrument according to claim 1, further comprising a locking portion provided between the lead tube and the slider to prevent the slider from coming off the lead tube. 3. An outer periphery near the rear end of the front shaft is provided with two slits at its rear end to form a receiving seat bulging inward at the rear end of the slit and the outer periphery of the front end of the lead cylinder. Provided with a circumferential brim-shaped locking part with a front sloped surface, elastically press-fitting and locking the locking part to the receiving seat, the lead tube is rotatable with respect to the leading shaft and cannot move in the axial direction. The telescoping writing instrument according to claim 1, wherein the telescoping writing instrument is characterized in that