JPH0432306Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sharpening pencil whose axial length can be expanded and contracted.

[Conventional technology]

The shaft length of a writing instrument needs to be long enough for ease of use when writing, but when not in use, it is better to have a shorter shaft length in consideration of portability. Accordingly, various writing instruments such as ballpoint pens have been proposed whose shaft lengths can be expanded and contracted. By the way, a mechanical pencil has a notch part, which has the disadvantage that it can be accidentally knocked down and the lead drawn out when it is attached to a pocket or the like. Also, the sharp tip of the pencil has a sharp point that can pierce pockets and the like.

[Problem that the invention attempts to solve]

Therefore, the object of the present invention is to provide a retractable sharp pencil whose shaft length is freely extendable and shortened to make it convenient to carry, and whose knob and tip can be retracted into the shaft. .

[Means for solving problems]

The telescoping mechanical pencil of the present invention devised to achieve the above object has a tip shaft, a rear shaft that is movable in the axial direction with respect to the tip shaft and rotatable in the circumferential direction, and a A writing body that is housed so as to be movable in the axial direction and whose lead is drawn out by moving the rear end in the axial direction, and a writing body that has a driven cam protrusion A that fits into the rear end of the writing body and is moved backward by a spring. It has a writing holder which is movable in the axial direction with respect to the front shaft and non-rotatable in the circumferential direction, and has a driven cam protrusion B, which is movable in the axial direction with respect to the rear shaft and is supported by a spring. An eraser holder that is projected forward and is attached to the writing body holder so as to be movable in the axial direction but unrotatable in the circumferential direction, a vertical groove portion in the axial direction, a diagonal groove portion A extending diagonally forward from the front end of the eraser holder; A cam guide consisting of a lateral groove A extending from its tip in a direction substantially perpendicular to the axial direction, a diagonal groove B extending diagonally rearward from the rear end of the longitudinal groove, and a lateral groove B extending substantially perpendicular to the axial direction from its tip. The driven cam protrusion of the writing body holder and the driven cam projection of the eraser holder are fitted into the cam guide grooves and are assembled to the writing body holder and the eraser holder so as to be movable in the axial direction and rotatable in the circumferential direction. It is equipped with a cam cylinder which is attached so that it can move freely in the axial direction with respect to the rear shaft, but is integrally rotated, and is pushed backward by a spring. When the driven cam protrusion A of the holder and the driven cam protrusion B of the eraser holder are positioned, the front shaft and rear shaft can move relatively back and forth, and the notches are provided at the tip of the cursive writing brush and the rear end of the eraser holder. are kept recessed into the shaft, and with the rear shaft retracted relative to the front shaft, the rotation of the rear shaft with respect to the front shaft causes the driven cam protrusion A and the driven cam projection B to connect to the oblique groove portion A, respectively. The brush tip and the knob are dimensioned so that they both protrude off-axis when guided by the groove B and positioned and locked in the lateral grooves A and B.

〔Example〕

In the illustrated embodiment, the base 1 is press-fitted and fixed to the front end, and the rotation stop ring A is placed slightly forward of the center of the inner surface.
2 and a retaining ring 3 fixed to the outer surface of the rear end, and a clip receiving ring 5 to the inner surface of the rear end.
Press fit the crown 6 with the center open and attach the clip 7.
A rotation stop ring B9 is fixed at a position slightly rearward from the center of the inner surface by sandwiching the mounting ring part 8 of the holder, and a decorative ring 10 is fixed to the front end edge so that it can freely rotate in the circumferential direction with respect to the tip shaft 4. The rear shaft 11 is assembled so as to be movable in the axial direction, and the chuck mechanism 12 is built into the tube 13 as shown in FIG. A stepped portion 16 is provided on the outer surface of the front end of the tube 13 that protrudes from the end opening and can abut against the inner edge 15 of the opening of the cap 1, and by axially moving the rear end of the lead case 14, the lead is fed out by the chuck mechanism 12. It has the same mechanism as that of a general sharp pencil, and has a writing body 17 housed inside the cap 1 and the tip shaft 4 so as to be movable in the axial direction, and a driven cam protrusion A19 on the outer surface of the rear end cylinder part 18. The provided front end is fitted into the core case 14 of the writing body 17 and assembled with the rotation stop ring A2, and the front end and the inner step 20 of the base 1 are connected to each other.
A cursive holder 22 that is elastically pushed backward by a coil spring A21 interposed between the cursor holder 22 and is movable in the axial direction with respect to the tip shaft 4 but cannot be rotated in the circumferential direction.
A follower cam protrusion B23 and a collar 24 are provided on the outer surface, and an eraser stopper 26 holding an eraser 25 is fitted to the rear end, a knob cover 27 is attached, and the front end cylinder part 28 is connected to the rear end cylinder part of the writing body holder 22. The eraser holder 30 is inserted into the eraser holder 18 so as to be movable in the axial direction but unrotatable in the circumferential direction, and is urged forward by a coil spring B29 interposed between the collar 24 and the clip receiving ring 5, and FIG. As shown in the figure, there is a vertical groove 31 in the axial direction, a diagonal groove A32 extending diagonally forward from the front end of the vertical groove 31, a lateral groove A33 that bends perpendicularly to the axial direction at the tip of the diagonal groove A32, and a diagonal groove A33 diagonally extending from the rear end of the vertical groove 31. A cam guide groove 36 is provided, which is composed of a rearward diagonal groove B34 and a lateral groove B35 that bends perpendicularly to the axial direction at the tip of the diagonal groove B34, and the driven cam protrusion A19 of the writing holder 22 and the eraser are inserted into the cam guide groove 36. The driven cam protrusion B23 of the holder 30 is fitted and assembled with the rotation stop ring B9, and rotates integrally with the rear end 11, but is movable in the axial direction between the front end and the rotation stop ring A2 in the front shaft 4. The driven cam protrusion A of the writing body holder 22
19 and the driven cam protrusion B23 of the eraser holder 30
Both the vertical groove portion 3 of the cam guide groove 36 of the cam cylinder 38
1, the tip of the writing body 17 and the top end of the knob cover 27 maintain a state in which they are recessed into the tip opening of the cap 1 and the center opening of the crown 6, respectively, and the rear shaft 11 is held in place relative to the front shaft 4. When the driven cam protrusion A19 is moved forward and the axial length is made the shortest as shown in FIG. 2, the driven cam protrusion A19 is located approximately in the center of the vertical groove portion 31 of the cam guide groove 36 of the cam cylinder 38, as shown in FIG. B
23 is dimensioned so that it is located at the rear end of the vertical groove 31, and when the rear shaft 11 is pulled rearward with respect to the front shaft 4, the driven cam protrusion A19 moves relatively to the front end of the vertical groove 31. In this state, the decorative ring 10 of the rear axle 11 and the retaining ring 3 of the front axle 4 collide with each other to reach the backward limit state, and from that state, the rear axle 1 is further moved against the front axle 4.
1 by rotating the driven cam protrusion A19.
is advanced along the diagonal groove A32, and the driven cam protrusion B23 is retreated along the diagonal groove B34 so that they are positioned in the lateral groove A33 and the lateral groove B35. The knock cover 27 is dimensioned so that it protrudes from the end opening and the top end of the knock cover 27 protrudes from the crown 6 by a required amount and locks therein.

[Effect]

FIG. 1 shows a state in which the axial length has been extended to make the tip and notch portions of the brush protrude, and writing is performed in this state. When the lead is fed out, by pressing the knock cover 27 forward, the knocking force is sequentially transmitted to the eraser holder 30, the cam cylinder 38, the writing body holder 22, and the lead case 14 of the writing body 17, and the lead is fed out. When carrying around after writing, the rear shaft 11 is rotated with respect to the front shaft 4, and the driven cam protrusions A19 and B35 located in the lateral grooves A33 and B35 of the cam guide groove 36 of the cam barrel 38 are removed. The driven cam protrusions B23 are guided through the oblique grooves A32 and B34, respectively, and are located at the front and rear ends of the longitudinal groove 31, so that the brush tip and the notch are first recessed, and then the rear shaft 11 moves forward relative to the front shaft 4. When the shaft length is set to the shortest state, the driven cam protrusion A19 will again be in the vertical groove portion 3 as shown in FIG.
It will be located approximately in the center of 1.

[Effect of idea]

As mentioned above, the shaft length of the present invention is of course expandable and retractable, but when the shaft length is shortened, the knob and the tip of the brush retract into the shaft, which prevents the lead from being accidentally drawn out when attached to a pocket, etc. This has the effect of eliminating problems such as the brush tip sticking into pockets, etc.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention; Fig. 1 is a longitudinal sectional view with the axial length extended, Fig. 2 is a longitudinal sectional view with the axial length shortened, and Fig. 3 is a longitudinal sectional view of the cam cylinder. The developed plan view and FIG. 4 are half-longitudinal cross-sectional views of the cursive writing. 1... Cap, 2... Rotation stop ring A, 3... Stop ring, 4... Tip shaft, 5... Clip receiving ring, 6... Crown, 7... Clip, 8... Mounting ring section, 9... Rotation stop ring B, 10... Decorative ring, 11... Rear shaft, 12... Chuck mechanism, 1
3... Tube, 14... Core case, 15... Inner edge of opening, 16... Step, 17... Cursive, 18
... Rear end cylinder part, 19 ... Followed cam protrusion A, 20 ...
...Inner surface step, 21... Coil spring A, 22... Cursive holder, 23... Followed cam protrusion B, 24...
... Tsuba, 25 ... Eraser, 26 ... Eraser stopper,
27...Knot cover, 28...Front end cylinder part, 29
...Coil spring B, 30...Eraser holder, 3
1... Vertical groove part, 32... Diagonal groove part A, 33... Horizontal groove part A, 34... Diagonal groove part B, 35... Horizontal groove part B, 3
6...Cam guide groove, 37...Coil spring C, 3
8...Cam tube.

Claims (1)

[Scope of utility model registration request] A front shaft, a rear shaft that is movable in the axial direction with respect to the front shaft and rotatable in the circumferential direction, and a rear shaft that is housed inside the front shaft so as to be movable in the axial direction and whose rear end portion moves in the axial direction. It has a writing body whose lead is drawn out and a driven cam protrusion A, which fits into the rear end of the writing body and is pushed backward by a spring, and is further movable in the axial direction with respect to the tip shaft and rotates in the circumferential direction. It has a writing body holder that is assembled in a fixed manner and a driven cam protrusion B, which is movable in the axial direction with respect to the rear shaft, and is elastically pushed forward by a spring, so that it can be freely moved in the axial direction with respect to the writing body holder, and in the circumferential direction. An eraser holder assembled in a non-rotatable manner, a longitudinal groove in the axial direction, a diagonal groove A extending diagonally forward from its front end, a lateral groove A extending substantially perpendicular to the axial direction from its tip, and a rear longitudinal groove. The cam guide groove has a cam guide groove consisting of a diagonal groove part B that runs diagonally backward from the end and a lateral groove part B that runs substantially perpendicular to the axial direction from the tip. It is fitted into the guide groove and assembled to the writing holder and the eraser holder so that it can move freely in the axial direction and freely rotate in the circumferential direction, and it can move freely in the axial direction with respect to the rear shaft, but the rotation is integrated. The cam barrel is assembled in such a manner that it is pushed backward by a spring, and the driven cam protrusion A of the writing holder and the driven cam protrusion B of the eraser holder are positioned in the vertical groove of the guide groove of the cam barrel. The front shaft and the rear shaft are relatively movable back and forth, and the tip of the cursive writing brush and the notch provided at the rear end of the eraser holder both maintain a state recessed into the shaft, and the rear shaft is relative to the front shaft. When the rear shaft rotates relative to the front shaft in the backward state, the driven cam protrusion A and the driven cam protrusion B are guided by the diagonal grooves A and B, respectively, and are positioned and locked in the lateral grooves A and B. A retractable sharp pencil characterized in that the dimensions are set so that both the tip and the notch protrude outside the axis when the brush is in the state.