JP3788341B2 - Side knock mechanical pencil - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a side knock type mechanical pencil in which a knock piece is arranged on a side wall of a shaft cylinder, and pressing the knock piece activates a core feeding means arranged inside the shaft cylinder.
[0002]
[Prior art]
As an example, JP-A-2000-1087 will be described. “An outer cylinder having a knock window formed in the side knock portion, a core feeding mechanism slidably provided in the longitudinal direction in the outer cylinder, and provided in the knock window so as to be pressed inward of the outer cylinder. And a side knock type mechanical pencil that slides the lead feeding mechanism by a knocking operation of the knock member to feed the lead, and the lead feeding mechanism has a lead passage inside. And a slider that slides in the longitudinal direction in the outer cylinder in cooperation with the knock member, chuck means provided at the front of the slider, and the slider and chuck means. And a sliding slope portion corresponding to the operating slope of the leg portion of the knock member on the outer periphery thereof, and the sliding slope portion is provided on the outer periphery of the slider. Symmetric in radial direction Side knock-type mechanical pencil characterized by comprising formed. "The're mainly gist. And as an example of the knock member, there are shown one having leg portions formed on both front and rear sides (see FIG. 2) and one formed only on both sides of the front portion (see FIG. 7). Yes.
[0003]
[Problems to be solved by the invention]
When performing the lead feeding operation, most operators press almost the center of the upper surface of the knock member. Therefore, the pressing force is transmitted from the center part of the knock member to the leg part formed at the end part. Here, there is no problem if the knock member has sufficient rigidity and the slider operates smoothly, but the knock member has insufficient rigidity or scratches. When the slider does not operate more smoothly, the center portion of the knock member is curved downward, and a sufficient lead feed amount may not be obtained.
Furthermore, when the above phenomenon is remarkable, the knock member may be bent from the center part, the leg part may be expanded in the left-right direction, or may be shaken in any one direction, The leg part may fall off from the slope part of the slider.
[0004]
[Means for Solving the Problems]
The present invention provides a side knock type mechanical pencil in which a knock piece is disposed on a side wall of a shaft cylinder, and pressing the knock piece activates a core feeding means disposed inside the shaft cylinder. The operation part for operating the core feeding means of the piece is formed on the inner wall surface of the knock piece, the operation part is formed before and after the knock piece in the longitudinal direction, and the operation part is formed in the longitudinal direction within the region of the knock piece. A first gist is that the knock piece perpendicular to the center of the axis is formed in the pressing direction of the knock piece. The knock piece is arranged on the side wall of the axial tube, and the knock piece is pressed, thereby A side knock type mechanical pencil for operating the lead feeding means disposed inside the door, wherein the actuating portion of the knock piece with respect to the lead feeding means is And forming in the inner wall surface click Komano, the second aspect that the knock piece was adapted to pivot relative to the radial direction of the barrel.
[0005]
[Action]
Rigidity is generated by the wall surface and vibration in the left-right direction is prevented.
[0006]
【Example】
One example will be described with reference to FIGS. The rear portion of the shaft tube 1 is a core tank portion 2 having a hexagonal cross section capable of storing a plurality of cores or a substantially octagonal core tank having curved corner portions. An eraser 3 is detachably fitted to the rear end portion of the shaft tube 1, and a cap 4 is detachably fitted so as to cover the eraser 3. The cap 4 is integrally formed with a clip 5 having a through-hole 5c formed at the base, but may be formed of a separate member and fixed to each other by means such as press fitting.
On the other hand, on the front inner side of the shaft tube 1, a core insertion hole 6 is formed which is smaller in diameter than the core tank portion 2 but can accommodate a plurality of cores, and the flange portion 7 which slides on the core tank 2. And a slider 8 having a core insertion portion 8a capable of storing a plurality of cores is disposed so as to be able to move back and forth. A chuck body 9 for gripping and releasing the core is provided at the front end of the slider 8. It is fixed. A chuck ring 10 for opening and closing the chuck body surrounds the front outer periphery of the chuck body 9. Reference numeral 11 denotes a tip member that is detachably fixed to the front end of the shaft cylinder 1 by means such as screwing. The tip member 11 holds the lead lightly, and the lead is retracted during the lead feeding operation. A slide member 14 on which a core detent member 12 made of a rubber-like elastic body to be blocked and a guide member 13 for guiding the core is arranged is arranged so as to be able to appear and retract. Reference numeral 15 denotes an O-ring made of a rubber-like elastic body arranged in the gap between the slide member 14 and the tip member 11, and the slide member 14 cannot move with an external force of about its own weight.
A cylindrical portion 16 is formed behind the slide member 14, and an engagement hole 17 is formed at a position facing the cylindrical portion 16. And the protrusion 18 formed in the front outer peripheral part of the said chuck | zipper body 9 is loosely inserted in the engagement hole 17, and is engaging. In other words, the protrusion 18 can move back and forth in the engagement hole 17 although it is slight.
[0007]
In addition, a recess 19 is formed in a part slightly forward of the central portion of the shaft tube 1. A window hole 20 is formed in the recess 19, and a knock piece 21 for moving the slider 8 forward is disposed in the window hole 20. The knock piece 21 has a U-shaped cross section, and the operation portion 23 is formed inside the both wall surfaces 22 in a state of being separated forward and backward. In addition, inclined surfaces 23 a and 23 b that are symmetrical with respect to the axial direction are formed at the front and rear end portions of the respective operating portions 23. That is, the knock piece 21 itself is symmetric with respect to the front and rear of the axis and to the left and right directions (see FIG. 4). In this embodiment, the inclined surface 23 a of the operating portion 23 is in contact with the inclined surface 24 formed in the intermediate portion of the slider 8. In other words, when the knock piece 21 is pressed in a direction perpendicular to the longitudinal direction of the shaft cylinder 1, the inclined surface 23 of the knock piece 21 presses the inclined surface 24 of the slider 8, thereby the slider 8 moves forward and the lead is drawn out. It is. By making the knock piece symmetrical with respect to the front and rear of the axis as well as to the left and right as in this embodiment, the front and rear direction of the knock piece is eliminated, so that when the knock piece is attached to the shaft cylinder, Assembling can be done without worrying about the direction of the piece, so that productivity can be improved.
A flat portion 8b is formed on the side portion of the slide member 8, and the inner surface 23c of the operating portion 23 can contact and slide on the flat portion 8b. That is, relative rotation between the knock piece 23 and the slide member 8 is prevented by the contact between the inner surface 23c and the flat portion 8b (see FIG. 3).
Reference numeral 25 denotes a grip member made of a rubber-like elastic body attached to the front portion of the concave portion 19, and the grip member 25 may be formed with a spiral groove, or without using a grip member. The shaft tube 1 may be subjected to knurling directly or the like to improve the anti-slip property when gripped. Reference numeral 26 denotes a chuck spring made of an elastic member such as a coil spring for urging the slider 8 and the chuck body 9 backward.
[0008]
Next, the operation will be described. When the knock piece 21 is pressed in the radial direction from the state shown in FIG. 2, the chuck body 9 that holds the trailing core A together with the slider 8 moves forward. As the subsequent lead A advances, the remaining lead B is also pushed forward. At this time, since the remaining core B is lightly held by the core detent member 12, the slide member 14 also tries to move forward, but the slide member 14 is slidably resisted by the O-ring 15 against the tip member 11. Therefore, only the remaining core B moves forward while sliding in the detent member 12 and protrudes from the tip of the slide member 14. Eventually, the protrusion 18 of the chuck body 9 comes into contact with the front end of the engagement hole 17. When the knock piece 21 is further pressed, the protrusion 18 of the chuck body 9 also presses the slide member 14 forward, and then the chuck body 9 expands to release the subsequent core A that has been gripped.
Here, when the pressing operation of the knock piece 21 is released, the chuck body 9 is expanded and returned together with the slider 8, and in this retraction process, the protrusion 18 of the chuck body 9 is engaged with the engagement hole of the slide member 14. 17 is brought into contact with the rear end, and the slide member 14 is also retracted. That is, the remaining core B lightly held by the core detent member 12 also moves backward together with the slide member 14. At this time, since the subsequent core A is in contact with the remaining core B due to its own weight, the subsequent core A also moves backward together with the remaining core B. Eventually, the chuck body 9 is closed by the chuck ring 10, and the trailing core A is gripped and retracted. However, since the protrusion 18 of the chuck body 9 is engaged with the engagement hole 17, it slides in the same manner as described above. The member and the remaining core B are also retracted. That is, the trailing core A and the remaining core B are always in contact with each other and move forward and backward.
[0009]
It should be noted that a plurality of slits may be formed at the tip of the illustrated slide member 14 so that the tip of the slide member 14 can be opened and closed, and the remaining core is held and released at the tip. The remaining core can be held at the tip of the slide member, and the remaining core can be effectively used without a sense of incongruity compared to the previous example.
In the previous example, the protrusion was formed on the outer peripheral surface of the front end of the chuck body and the slide member was retracted. However, the connecting member was extended from the slider, and the connecting member was engaged with the slide member and retracted. May be. A means for retracting the slide member can be adopted as appropriate.
[0010]
A modification of the knock piece will be described with reference to FIG. It is an example which made the operation | movement part of the knock piece of the said 1st example only the front side. More specifically, an operating portion 29 is formed inside the both wall surfaces 28 of the knock piece 27, and inclined surfaces 29 a and 29 b are formed at the front and rear end portions of the operating portion 29. Also in this example, the knock piece 27 has a symmetrical shape with respect to the front and rear of the axis and with respect to the left-right direction, so that the assembly is easy. Since the operation is the same as in the first example, description thereof is omitted.
FIG. 7 shows and describes a further modification of the knock piece. On the inner surfaces of both wall surfaces 31 of the knock piece 30, the operating portion 32 is formed in a state of being separated in the front-rear direction. The actuating part 32 formed before and after that has a rectangular shape, and the corner part 32a (32b) serves as a contact part to the slope part 24 of the slide member 8. That is, the slide member 8 moves forward when the corner portion 32a (32b) presses and slides the slope portion 24. Also in this example, since the knock piece 30 has a symmetrical shape with respect to the front and rear of the axis and with respect to the left and right direction, ease of assembly is achieved.
[0011]
A second example will be described with reference to FIG. The knock piece 33 of the side knock type mechanical pencil in this example is rotatable in the radial direction of the shaft tube 34. That is, the slide member 35 is advanced by rotating the knock piece 33 with the rear end of the knock piece 33 as a fulcrum, and the core is drawn out. Hereinafter, the knock piece 33 will be described in detail. The operation portions 37 are formed on the inner surfaces of both wall surfaces 36 of the knock piece 33. The contact portions of the operation portion 37 against the inclined surface 38 of the slide member 35 are provided. The part is only the front end corner part 37a. Even if it is called a corner, it is slightly curved. That is, the slightly curved front end corner portion 37a comes into contact with the inclined surface 38 of the slide member 35 to advance the slide member 35 forward.
As mentioned above, since the knock piece of the present invention has the operating portion formed inside the plane of the knock piece, it is easy to align the cavity and the core for molding the molded product of the mold in the injection molding, and it is accurate. It also has the effect that it can be molded easily. In particular, in an example in which an inclined surface is formed in the operating portion, it is possible to prevent burrs and the like as much as possible as compared to a knock piece having no wall surface. By the way, in a knock piece molded product having no wall surface, it is difficult to align the mold (cavity and core for molding the molded product) at the portion where the inclined surface is molded, and there is a high risk of occurrence of burrs.
[0012]
【The invention's effect】
The present invention provides a side knock type mechanical pencil in which a knock piece is disposed on a side wall of a shaft cylinder, and pressing the knock piece activates a core feeding means disposed inside the shaft cylinder. The operation part for operating the core feeding means of the piece is formed on the inner wall surface of the knock piece, the operation part is formed before and after the knock piece in the longitudinal direction, and the operation part is formed in the longitudinal direction within the region of the knock piece. A first gist is that the knock piece perpendicular to the center of the axis is formed in the pressing direction of the knock piece. The knock piece is arranged on the side wall of the axial tube, and the knock piece is pressed, thereby A side knock type mechanical pencil for operating the lead feeding means disposed inside the door, wherein the actuating portion of the knock piece with respect to the lead feeding means is And forming in the inner wall surface click Komano, since that knock piece was adapted to pivot relative to the radial direction of the barrel and the second aspect, it is possible to feed reliably core.
[Brief description of the drawings]
FIG. 1 is an external view showing the present invention.
FIG. 2 is a longitudinal sectional view of FIG.
FIG. 3 is a cross-sectional view of FIG.
FIG. 4 is a perspective view showing a knock piece.
FIG. 5 is a perspective view showing a slide member.
FIG. 6 is a cross-sectional perspective view showing a modified example of the knock piece.
FIG. 7 is a perspective view showing a further modification of the knock piece.
FIG. 8 is a longitudinal sectional view showing a second example.
9 is a perspective view of the main part of FIG.
FIG. 10 is a perspective view showing a knock piece of a second example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 shaft body 2 core tank part 3 eraser 4 cap 5 through-hole 6 core insertion hole 7 collar part 8 slider 9 chuck body 10 chuck ring 11 tip member 12 core detent member 13 guide member 14 slide member 15 O-ring 16 cylindrical part Reference Signs List 17 engagement hole 18 protrusion 19 recess 20 window hole 21 knock piece 22 wall surface 23 operating portion 23a inclined surface 23b inclined surface 24 inclined surface 25 grip 26 chuck spring 27 knock piece 28 wall surface 29 operating portion 29a inclined surface 29b inclined surface 30 knock piece 31 Wall surface 32 Actuating portion 32a Corner portion 32b Corner portion 33 Knock piece 34 Shaft cylinder 35 Slide member 36 Wall surface 37 Actuating portion 37a Corner portion 38 Inclined surface

Claims (2)

  A side knock type mechanical pencil, in which a knock piece is arranged on a side wall of the shaft cylinder and the core piece feeding means arranged inside the shaft cylinder is operated by pressing the knock piece, the core feeding means of the knock piece Is formed on the inner wall surface of the knock piece, and is formed on the front and rear sides of the knock piece in the longitudinal direction, and the action portion is formed at the center of the axis in the longitudinal direction in the region of the knock piece. A side knock type mechanical pencil characterized by being formed symmetrically with respect to an axis in a pressing direction of orthogonal knock pieces. A side knock type mechanical pencil, in which a knock piece is arranged on a side wall of the shaft cylinder and the core piece feeding means arranged inside the shaft cylinder is operated by pressing the knock piece, the core feeding means of the knock piece The side knock type mechanical pencil is characterized in that the operation part is formed in the inner wall surface of the knock piece and the knock piece can be rotated with respect to the radial direction of the shaft cylinder.

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