JP2000001087A - Side knock type mechanical pencil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extremely improve an operating efficiency even without particularly considering a directional property of a slider regarding a knock member in the case of assembling. SOLUTION: In the side knock type mechanical pencil comprising a lead feeding mechanism longitudinally movably provided in a barrel 1, a knock window 2a formed at a sidewall of the barrel 1, and a knock member 2 having forked legs 2b, 2c provided at the window 1a so as to be able to be pressed into the barrel 1 so that the mechanism is slid by a knocking operation of the member 2 to feed a lead from a tip end of the barrel 1; the mechanism has a slider 3 longitudinally sliding cooperatively with the member 2, a chuck 4 provided at a front part of the slider 3, and a return spring 7 for urging the slider 3 and the chuck 4 rearward. Further, the slider 3 has a lead passage 3a for containing a plurality of leads therein. Radially symmetrical sliding oblique surfaces 3e, 3f corresponding to longitudinally symmetrical operating oblique surfaces of the member 2 are formed on an outer periphery of the slider 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side-knock mechanical pencil capable of extending a lead by operating a knock member provided on a side wall of an outer cylinder to slide a lead-out mechanism.

[0002]

2. Description of the Related Art Conventionally, as a writing instrument of this kind, there has been one described in, for example, Japanese Utility Model Publication No. 6-15732 of the present applicant. That is, as shown in FIG. 9, a protruding / retracting mechanism at the distal end portion of the shaft body.
An elastic body 26 for urging the rear end of the shaft 23 is inserted into the outer cylinder 21 and the distal end of the shaft body 24 is supported against the elastic body 26 or by the elastic force of the elastic body 26 in response to the operation of moving the clip 23 in and out. The above-mentioned cam mechanism 28 for retracting the 27 is provided in the outer cylinder 21.

The cam mechanism 28 further includes front and rear engaging portions 30a and 30b which engage with the front and rear portions of the long hole 22 of the outer cylinder 21 at the front and rear portions of the base portion 29 of the clip 23, respectively. An engagement escape hole 31 is provided between the rear engagement portions 30a and 30b, and the front engagement portion 30a is in sliding contact with the front inclined surface 32 and becomes lower as going rearward. A moving portion 35 having a locking portion 33 to be locked by the joint portion 30a and a rear inclined surface 34 which engages with the engagement escape hole 31 and becomes lower toward the rear, is attached to a rear portion of the shaft body 34. A projection 36 is provided at the rear of the cam mechanism 38.

[Problems to be solved by the invention]

However, in these conventional examples, all parts of the side knock mechanism have directionality, and therefore, it is necessary to consider the directionality of all parts when assembling, so that assembling is troublesome and costly. That is, since this type of knock member has different shapes in the front and rear directions, there is a front-back direction in assembly, and the sliding slope of the slider is not symmetrical in the radial direction. There was a problem that it took time and effort.

Further, if the outer diameters of the front and rear sliding slopes of the slider are both increased in accordance with the inner diameter of the outer cylinder in order to obtain a sufficient knock stroke, the knock member is structurally knocked. The lower part of the slider comes into contact with the top of the rear sliding slope, so that sufficient knock cannot be obtained. There was a problem that the structure had to be complicated.

Further, the inner wall of the outer cylinder usually has a circular cross section, so that the side knock operation has a larger pressing force in the radial direction toward the axis of the outer cylinder than the rear end knock operation in which the outer wall is knocked in the longitudinal direction of the outer shaft. There is a problem in that the components inside the outer cylinder, particularly the slider directly contacting the knock member, are likely to rotate, and it is difficult to perform a reliable knock operation.

Further, in the side knock mechanical pencil, since the side knock mechanism is provided at the intermediate portion of the outer cylinder, the internal lead-out mechanism must be longer than the entire length of the outer shaft, and further longer. Since a space for accommodating a spare core must be provided at the rear portion of the outer cylinder as an element, there is a problem that a space for providing a rod-shaped object support mechanism or the like at the rear portion cannot be sufficiently obtained.

Accordingly, the present invention is to solve the above-mentioned conventional drawbacks, and to provide a side knock mechanical pencil that can be assembled without particularly considering the directionality of the knock member and the slider during assembly. It is intended to do so.

Another object of the present invention is to provide a side knock mechanical pencil in which the assembled mechanical pencil has a very easy operation of a knocking member and the core can be reliably fed out.

Further, the present invention secures a sufficient space for filling a spare core in the slider at the front part of the outer cylinder and eliminates the need to fill the spare core in the rear part of the outer cylinder by that much. It is an object of the present invention to provide a side-knock mechanical pencil capable of providing a mechanism for feeding a rod-shaped object such as an eraser.

Further, the present invention provides a side-knock mechanical pencil having a simple structure without a special relief so as not to come into contact with the lower portion of the knock member at the rear sliding slope of the slider. The purpose is to provide.

It is a further object of the present invention to provide a side knock mechanical pencil in which the rotation of the slider is prevented by a simple structure and the knock operation is ensured.

[0013]

In order to achieve the above object, a side knock mechanical pencil according to the present invention comprises an outer cylinder having a knock window formed in a side knock portion, and a longitudinal direction in the outer cylinder. A knockout member slidably provided on the knockout window and a knocking member provided in the knocking window so as to be pressed inwardly of the outer cylinder and having a bifurcated leg. In a side knock type mechanical pencil that slides a feeding mechanism to feed a lead, the lead feeding mechanism has a lead passage formed therein and slides in the longitudinal direction in the outer cylinder in cooperation with the knock member. A slider, a chuck means provided at a front portion of the slider, and a return spring for urging the slider and the chuck means rearward, and the slider is So Periphery the sliding inclined surface portion provided with a sliding inclined surface portion corresponding to the working slope of the leg of the knock member is formed symmetrically in the radial direction.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a side knock mechanical pencil according to the present invention will be described in detail with reference to the accompanying drawings. First, FIGS. 1 to 4 show a first embodiment of the present invention. In FIG. 1, a core feeding mechanism movably provided in a longitudinal direction is provided inside an outer cylinder 1. . This lead-out mechanism is a slider which slides back and forth in the outer cylinder 1 in conjunction with a knock member 2 which is pushed inward through a knock window 1a formed in a side wall of the outer cylinder 1 described later. 3, the slider 3 and the tip chuck 4
a, a joint 6 for connecting the chuck 4 with the chuck ring 5 loosely fitted thereto, and a return spring 7 provided in the sleeve 6a and urging them backward.
Reference numeral 8 in the drawing denotes a cushion spring for absorbing excessive writing pressure, and a tip tip 10a fixed to a slider 10 that slides while holding a core is provided in the tip of the leading tool 9.

Further, in the mechanical pencil according to this embodiment, the core passage 3g of the slider 3 has a diameter capable of accommodating a plurality of cores at a time, and a spare core is provided in the rear portion of the outer cylinder 1. There is no need for a space to accommodate, so there is room. Therefore, an eraser feeding mechanism, which is a rod-like object formed by a rotation operation, is provided at the rear of the core feeding mechanism in the outer cylinder 1. That is, this eraser feeding mechanism is provided with a guide tube 11 removably provided in the rear portion of the slider 3, a rear cap 12 provided in the guide tube 11, and a rod-shaped eraser 13, It comprises an eraser cradle 14 which can be moved up and down in the rear cap 12 by a rotation operation.

More specifically, the guide cylinder 11 has a detachable engaging projection 11a on the outside of the lower part with a bottom.
It has slits for guides in the longitudinal direction. A rear cap 12 is provided in the guide tube 11. A spiral groove 12 a for guiding the eraser receiving stand 14 is formed on the inner periphery of the rear cap 12. Has an engaging projection 14a of the eraser receiving base 14.
Are engaged and guided.

Next, the slider 3 and the knock member 2, which are important components of the present invention, will be described in detail with reference to FIGS. First, the knock member 2 has a so-called arch-shaped operation surface 2a whose center to which the fingertip contacts during operation is raised, and the operation surface 2a which is located in the knock window 1a of the outer cylinder 1 and is in contact with the slider 3. In front of the forked part integrally formed on both sides
The rear legs 2b and 2c are provided respectively.

The pair of front and rear legs 2b, 2b
In the front part of c, an operating slope 2bb descending rearward,
2 cc are provided. Front and rear legs 2b, 2c
Locking claws 2d, 2e projecting to the side so as not to fall out when set in the knock window 1a of the outer cylinder 1
Are provided respectively.

On the other hand, the slider 3 comprises a front cylindrical portion 3a, an intermediate cylindrical portion 3b, a rear cylindrical portion 3c, and a large-diameter receiving portion 3d behind the rear cylindrical portion 3c. A front sliding slope 3e is integrally provided on the outer periphery between the cylindrical portion 3b and the outer periphery. A symmetrical sliding surface 3ee descending rearward from both sides is formed at the back of the front sliding slope 3e. The front operating slope 2bb of the front leg 2b is pressed against the sliding surface 3ee of the knock member 2 by the action of the return spring 7.

Further, a rear sliding slope 3f is integrally provided on the outer periphery between the intermediate cylindrical portion 3b and the rear cylindrical portion 3c. A symmetrical sliding surface 3ff descending rearward from both sides is formed on the back of the rear sliding slope 3f. The operating slope 2bb of the rear leg 2c is pressed against the sliding surface 3ff on the knock member 2 side by the action of the return spring 7.

The outer shape of the rear sliding slope 3f is smaller than that of the front sliding slope 3e. That is, as is clear from FIG. 1, the front sliding slope 3e is almost in contact with the inner periphery of the outer cylinder 1 when set on the outer cylinder 1, whereas the rear sliding slope 3f is not in contact with the outer cylinder. There is a gap with respect to the inner circumference of the cylinder 1. Unless the outer diameter of the rear slope portion 3f is reduced as described above, the knock member 2 may be used when the side knock operation is performed.
This is because the rear side of the operation surface 2a may come into contact with the rear sliding slope 3f during knocking and be obstructed, so that a sufficient knock stroke may not be obtained.

A slider 3 urged rearward by a return spring 7 is disposed in front of the outer cylinder 1. A chuck 4 having a chuck ring 5 loosely fitted is fixed in front of the slider 3. The chuck 4 has a core feeding action, and the chuck ring 5 comes into contact with a step 9a formed on the inner wall of the leading tool 9 in the knocking process to separate from the chuck 4 to open and close the chuck 4. is there.

Next, the operation of the mechanical pencil according to the above embodiment will be described. First, when the operation surface 2a of the knock member 2 is pressed radially inward of the outer cylinder 1 with a fingertip in a state shown in FIG. 3 in which the core is stored in use, the center of the operation surface 2a of the knock member 2 is pressed. A pressing force acts on the outer surface of the knock member 2 so that the outer periphery of the knock member 2 is guided by the inner periphery of the knock window 1a so that the operation surface 2a is parallel to the axis of the outer cylinder 1 toward the inside of the outer cylinder 1. The knock member 2 moves while maintaining the position, and retracts into the outer cylinder 1 as shown in FIG.

At the time of this knocking operation, the front operation slope 2bb and the rear operation slope 2cc of the knock member 2 return the front slide slope 3e and the rear slide slope 3f of the slider 3 respectively. The slider 3 slides against the rearward biasing force of the spring 7 while sliding.
Slide forward. Then, by the sliding action on the slider 3, the chuck provided on the slider 3 moves forward, and the chuck ring 5 abuts on the step 9a in the leading tool 9, and the chuck 4 moves.
Is released, and the chuck 4 further advances to move the tip 1
The core is protruded from 0a. When the knock is released, the chuck 4 retreats. In this retreating process, the chuck ring 5 is fitted into the chuck portion 4a of the chuck 4 to close the chuck 4, so that writing can be performed in a state where the core is projected. .

When the writing is completed, the core can be stored by knocking it again and pressing the core lightly against the paper surface or a fingertip with the chuck 4 opened, and pressing the core lightly. Also,
If the user wants to use the eraser 13 such as when making a mistake during writing, and holding the rear cap 12 and rotating it, the pedestal 14 will have the helical groove 12 a in the rear cap 12 and the guide cylinder 1.
The eraser 13 can be used by being raised by being restricted by the slits formed in the longitudinal direction of 1 and protruding from the rear end. The eraser 13 can be stored by rotating the rear cap 12 in the reverse direction and lowering the eraser receiver 14.

When the writing core has been lost, the rear eraser feeding mechanism is pulled out from the large-diameter receiving portion 3d of the slider 3, and a plurality of cores are inserted into the slider 3. It is guided by the large-diameter receiving portion 3d and guided to the chuck 4 through the core passage 3g. The diameter of the core passage 3g of the slider 3 is large enough to accommodate a plurality of cores, so that the slider 3 also has a function as a core tank. Sufficient space for mounting the mechanism can be obtained.

FIGS. 5 and 6 show a second embodiment of the present invention. In this side knock mechanical pencil, FIG.
A special clip receiving base 15 is attached to the rear part in place of the above-described rotary mechanism for feeding out the eraser, and
5, an eraser 13 is loaded in the upper receiving portion 15a. A supply hole 15b for refilling the refill core is formed at the center of the bottom of the receiving portion 15a. In addition, the code | symbol 16 in a figure shows an eraser cap.

The outer wall of the large-diameter receiving portion 3d at the rear of the slider 3 is formed with two engaging grooves 3h in the longitudinal direction. The outer cylinder corresponds to these engaging grooves 3h. Two engagement ribs 1c are provided on the inner wall portion of the unit 1 in the longitudinal direction. (See FIG. 5) More specifically, detent means for preventing rotation of the slider 3 with respect to the outer cylinder 1 are further provided outside the slider 3 and inside the outer cylinder 1. That is, the rotation preventing means is provided with an engaging groove 3h formed in the outer wall of the large diameter receiving portion 3d at the rear part of the slider 3 in the longitudinal direction, and in the longitudinal direction on the inner wall of the outer cylinder 1 corresponding to the engaging groove 3h. And the formed engaging rib 1c. Although not shown, it is convenient for assembling to further form a guide portion which is gradually widened toward the front at the front end of the engagement groove 3h.

As described above, the engagement groove 3h of the slider 3 and the outer cylinder 1
Since the slider 3 does not rotate with respect to the outer cylinder 1 due to the engagement structure with the engagement rib 1c, the knocking operation is reliably performed. Further, even when the slider 3 is incorporated into the outer cylinder 1, there is an advantage that the positioning in the rotation direction is easily performed by the engagement structure of the engagement groove 3h and the engagement rib 1c of the outer cylinder 1. In addition,
If a guide portion is formed in which the front end opening of the engagement groove 3h of the slider 3 is gradually widened toward the front, the engagement rib 1c can be easily formed when the slider 3 is incorporated into the outer cylinder 1. There is also an advantage of being guided in the engagement groove 3h.

Further, the outer shape of the slider 3 is made into an irregular shape such as an elliptical shape, and the cross-sectional shape inside the outer cylinder 1 is made into an irregular shape corresponding to this, so that the rotation of the slider 3 is prevented from rotating. It may be used as a means.

FIG. 7 is a perspective view of a knock member and a slider used in a side knock mechanical pencil according to Embodiment 3 of the present invention. Embodiments 1 and 2
The fork leg of the knock member 2 is a pair of front and rear legs 2
The slider 3 is provided with a pair of front and rear sliding slopes 3e, 3f.
However, the present invention should not be limited to the above embodiment.

That is, in FIG. 7, the knock member 2 has only the front leg 2b, and the slider 3 has only the front sliding slope 3e corresponding to the front leg 2b.
In this case, the rear end of the knock member 2 is locked to the rear end of the knock window 1a of the outer cylinder 1, and when knocked, the front portion of the knock member 2 is lowered with the rear end as a fulcrum, and the front operation slope 2bb
Presses the front sliding slope 3 e and slides the slider 3 forward against the return spring 7. Therefore, there is no problem in operation even if the pair of the legs of the knock member 2 and the sliding slopes of the slider 3 are not necessarily provided in the front and rear, respectively.

FIG. 8 shows a modified example of the knocking member 2. The knocking member 2 has a projection 2f formed on the upper surface of the front end. By forming the knocking member 2 in this manner, the tip of a fingertip having good sensitivity can be brought into contact with this portion to perform a knocking operation. There is an advantage that the state of retreat can be clearly seen.

[0034]

Since the side knock mechanical pencil of the present invention has the above-described structure, it is not necessary to particularly consider the direction of the slider with respect to the knock member when assembling, so that the working efficiency is extremely high. .

Further, according to the present invention, the assembled mechanical pencil has an effect that the knock member can be easily operated and the lead can be reliably pulled out.

Further, a sufficient space for filling the spare core in the slider at the front part of the outer cylinder is ensured, so that there is no need to fill the spare core in the rear part of the outer cylinder. And the like can be provided.

Furthermore, according to the present invention, there is an effect that a sufficient and reliable knock stroke can be obtained by a slider having a simple structure.

Further, according to the present invention, it is easy to slightly extend the lead by a delicate touch with the tip of a finger, and it is also possible to perform a knock operation while looking at the tip of the knock member.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a side knock mechanical pencil according to an embodiment of the present invention.

FIG. 2 is a perspective view of a knock member and a slider of FIG. 1;

FIG. 3 is a cross-sectional view showing the side knock mechanism of FIG. 1;

FIG. 4 is a cross-sectional view showing the knocked state of FIG. 3;

FIG. 5 is a longitudinal sectional view of a side knock mechanical pencil according to another embodiment of the present invention.

FIG. 6 is a perspective view of the knock member and the slider of FIG. 5;

FIG. 7 is a perspective view of a knock member and a slider used in a side knock mechanical pencil according to still another embodiment of the present invention.

FIG. 8 is a side view showing a modification of the knock member.

FIG. 9 is a longitudinal sectional view showing a conventional writing instrument.

[Explanation of symbols]

 Reference Signs List 1 outer cylinder 2 knock member 3 slider 4 chuck 5 chuck ring 6 joint 7 return spring 8 cushion spring 9 leading tool 10 slider 11 guide cylinder 12 rear cap 13 eraser 14 eraser receiver 15 clip holder 16 eraser cap

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yoshihide Mitani 138 Kawarai-shi, Kawagoe-shi, Saitama F-term (reference) in Kotobukigawago factory 2C353 FA06 FC13 FE16 FE18 MA06 MC09

Claims (10)

[Claims] 1. An outer cylinder having a knock window formed in a side knock portion, a core feeding mechanism slidably provided in a longitudinal direction in the outer cylinder, and pressing the knock window inward in the outer cylinder. A side-knock type mechanical pencil which is provided so as to be capable of being provided and includes a knock member having a bifurcated leg portion, and slides the lead feeding mechanism by knocking the knock member to feed the lead.
A slider having a core passage formed therein and sliding in the longitudinal direction in the outer cylinder in cooperation with the knock member; a chuck means provided at a front portion of the slider; And a return spring for urging the chuck means rearward, and the slider has a sliding slope corresponding to the operating slope of the leg of the knock member on the outer periphery thereof. A side-knock mechanical pencil, characterized in that the moving slope is formed symmetrically in the radial direction. 2. The leg of the knock member comprises front and rear legs separated from each other, and the slider comprises a front cylinder, an intermediate cylinder, a rear cylinder, and a rear end of the rear cylinder. And a large-diameter receiving part provided on the front and rear legs. 2. The side-knock mechanical pencil according to claim 1, wherein the mechanical pencil is provided between the tubular portion and the rear tubular portion. 3. The side-knock mechanical pencil according to claim 1, wherein the front and rear legs of the side knock member are formed symmetrically in the longitudinal direction. 4. The side-knock mechanical pencil according to claim 1, wherein the outer diameter of the rear sliding slope of the sliding slope of the slider is smaller than the outer diameter of the front sliding slope. 5. The side-knock mechanical pencil according to claim 1, further comprising detent means for preventing rotation of the slider with respect to the outer cylinder, outside the slider and inside the outer cylinder. 6. A locking groove formed in a longitudinal direction on an outer wall of a large diameter receiving portion at a rear part of a slider,
2. A side-knock mechanical pencil according to claim 1, comprising locking ribs formed in the inner wall of the outer cylinder in a longitudinal direction corresponding to the locking grooves. 7. The side-knock mechanical pencil according to claim 1, wherein a protrusion is formed at a front portion of the operation surface on the upper surface of the knock member. 8. The side-knock mechanical pencil according to claim 1, wherein the core passage of the slider has a diameter capable of accommodating a plurality of cores at one time. 9. The side-knock mechanical pencil according to claim 8, further comprising a rod-shaped object supporting means at a rear portion of the outer cylinder. 10. The side-knock mechanical pencil according to claim 9, wherein the rod supporting means is a rotary rod feeding mechanism.