JP3882272B2 - Sharp pencil - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sharp pencil in which a chuck body for holding and releasing a core is disposed in a shaft cylinder.
[0002]
[Prior art]
Japanese Utility Model Laid-Open No. 4-104492 is known as a sharp pencil having a knocking member for operating the lead feeding mechanism at the rear end of a shaft cylinder of the sharp pencil incorporating the lead feeding mechanism. A cushion spring is provided at the rear of the chuck to prevent breakage of the core due to excessive writing pressure, and the elastic force of the cushion spring can be varied.
[0003]
[Problems to be solved by the invention]
However, in the above prior art, although the breakage of the lead can be prevented by the cushion spring, the lead is reduced by writing and the end surface of the lead becomes elliptical, and as a result, the width of the writing line becomes gradually wider It was something that would end up. Here, in order to maintain the width of the thin writing line, there is a method of writing with a thin diameter lead, but the breakage strength is reduced because the lead is thin. There is also a method of changing the writing instrument and rotating the writing instrument itself. That is, by rotating the writing tool itself, the lead is indirectly rotated, and the other end face of the lead is directed to the writing (paper) surface. However, each time, the writing instrument must be changed and rotated, and the operation is troublesome and troublesome.
[0004]
[Means for Solving the Problems]
The present invention has been made in view of the above problems, and is a sharp pencil in which a chuck body for gripping and releasing a core is disposed in a shaft cylinder, and the core is extended by a forward movement of the chuck body. And a chuck body rotating means for rotating the chuck body by a retreating operation of the core gripped by the chuck body, the chuck body rotating means comprising a slider and a rotor contacting the slider, and And a cam portion provided on an inner wall surface of the shaft cylinder, and a chuck ring for opening and closing the chuck body is surrounded by a front portion of the chuck body, and the slide is formed at a rear end of the chuck ring. The rotor is brought into contact directly or via the core, the rotor that moves as the slider moves is brought into contact with the slider, and the slider and the slider Chat located in front And body, said rotor is biased forward by the elastic member, also with some not rotate but to allow movement back and forth the slider relative to the barrel, the rear portion of the chuck body The gist is that a lead tank is fixed, and the rotor is arranged in the lead tank so that the rotor cannot be rotated with respect to the lead tank but can be moved back and forth.
[0005]
【Example】
An example will be described with reference to FIGS. 1 and 3 to 6. A core tank 2 for storing a plurality of cores is disposed in the shaft cylinder 1 so as to be movable back and forth (hereinafter, the lower side in the figure is referred to as the front and the upper side is referred to as the rear). A chuck body 3 for holding and releasing the core is fixed to the front end of the core tank 2, and a chuck ring 4 for opening and closing the chuck body 3 is inserted and attached to the chuck body 3. ing. A tip member 6 having a core detent member 5 provided therein is detachably fixed to the front end of the shaft tube 1 by means such as screwing. Reference numeral 7 denotes a chuck spring having elasticity such as a coil spring that urges the chuck body 3 forward.
[0006]
A slider 8 is inserted into the core tank 2, and the front end of the slider 8 is in contact with the rear end of the chuck ring 4 via a core N. FIG. As shown, the slider 8 and the chuck ring 4 may be brought into direct contact with each other. On the other hand, vertical ribs 9 are formed on the outer periphery of the rear end of the slider 8 at equal intervals, and the rear end surface of the slider 8 has a mountain shape with the top of the portion that contacts the vertical rib 9. A plurality of projections 10 are formed at equal intervals.
The protrusion 10 is engaged with a cam portion 11 formed on the inner wall surface of the intermediate portion of the shaft tube 1. More specifically, the cam portion 11 has a longitudinal projection 12 that is long in the longitudinal direction with respect to the shaft cylinder 1 and a length shorter than the longitudinal projection 12 and smaller than the inner diameter of the shaft cylinder 1, but the longitudinal projection 12. The upper end surface of the vertical projection 12 and the upper end surface of the vertical groove portion 13 are connected by an inclined surface 14. A plurality of the vertical protrusions 12 and the vertical groove portions 13 are formed on the inner peripheral surface of the shaft tube 1 at equal intervals. Here, the protrusion 10 of the slider 8 is engaged with the longitudinal groove portion 13 of the cam portion 11 and is not rotatable with respect to the cam portion 11 (shaft cylinder 1), but is moved in the vertical direction. Is possible.
[0007]
A rotor 15 is urged forward by an elastic member 16 and abuts the upper end of the slider 8. The rotor 15 has a vertical protrusion 17 on the outer periphery, and an inclined surface 18 is formed at the lower end of the protrusion 17. The vertical protrusion 17 is in contact with the inclined surface 14 of the cam portion 11.
A through hole 19 through which the core tank 2 passes is formed at the center of the rotor 15, but the rotor 15 and the core tank 2 are not rotatable but can be moved in the vertical direction. It has become. Specifically, a recess 20 is formed at a position opposite to the through hole 19, and a protrusion 21 formed on the core tank 2 is engaged with the recess 20 (see FIG. 4). .
[0008]
A spring receiver 22 is fixed to the rear of the rotor 15 to prevent the elastic member 16 from moving backward (dropping off).
In addition, an eraser holder 24 holding an eraser 23 is detachably press-fitted to the rear end of the core tank 2. A knock (eraser) cap 25 that also serves as a pressing operation unit is detachably press-fitted into the eraser holder 24.
[0009]
Next, the operation will be described. When feeding out the lead, the knock (eraser) cap 25 is pressed in the same manner as a general sharp pencil. By this pressing operation, the lead tank 2 moves forward while sliding through the through hole 19 of the rotor 15. As the lead tank 2 moves forward, the chuck body 3 moves forward. At this time, the lead L is also moved forward, and the chuck body 3 expands eventually. Here, when the pressing operation of the knock cap 25 is released, the lead tank 2 and the chuck body 3 retreat, and the lead L is gripped again. This completes the feeding of the lead.
[0010]
If the lead is reduced and the writing line becomes thick during writing, the lead L is pressed slightly against the paper (writing surface) during writing. By this pressing operation, the chuck ring moves backward through the chuck body 3 that holds the core L. As the chuck ring 4 is retracted, the slider 8 is retracted, and the rotor 15 is also retracted (see FIG. 6). Due to the backward movement of the rotor 15, the protrusion 17 of the rotor 15 reaches the top of the vertical protrusion 12 of the cam portion 11, and eventually slides down (moves forward) while rotating to the inclined surface 14 of the next (adjacent) vertical protrusion 12. Return to the original position). The engagement state between the protrusion 10 of the slider 8 and the inclined surface 18 of the rotor 15 gives the rotor 15 a turning stake, and then the rotor 15 rotates according to the engaged state of the inclined surface 18 and the inclined surface 14. It is. Here, depending on the setting of the resilient force of the resilient member 16, specifically, if the resilient force is reduced, the resilient member 16 can be rotated each time the core is separated from the paper surface.
As a result of the above operation, the lead tank 2 is rotated by the rotation of the rotor 15, and the chuck body 3 and the core L held by the chuck body 3 are rotated.
In addition, since the core (chuck body) moves backward by pressing the core against the paper surface, a cushioning action works as in the prior art, and breakage of the core can be prevented.
[0011]
【The invention's effect】
The present invention relates to a sharp pencil in which a chuck body for gripping and releasing a core is disposed in a shaft cylinder. Chuck body rotating means for rotating the chuck body by operation includes a slider, a rotor in contact with the slider, and a cam portion provided on the inner wall surface of the shaft cylinder. The chuck ring for opening and closing the chuck body is surrounded at the front portion of the chuck body, and the slider is contacted directly or via a core at the rear end of the chuck ring. A rotor that moves as the slider moves, abuts the slider, the slider , a chuck body positioned in front of the slider , and the rotor before by the elastic member A is energized, also with some not rotate but to allow movement back and forth the slider relative to the barrel, a lead tank is fixed to the rear of the chuck body, the rotation to the lead tank Although the child is not rotatable with respect to the lead tank, it is arranged so that it can be moved back and forth, so that the lead can be rotated with a simple operation by simply pressing the lead against the paper surface. A writing line with a certain width can be drawn without being generated.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a first example of the present invention.
FIG. 2 is a longitudinal sectional view showing a modification.
FIG. 3 is a partial cross-sectional perspective view showing main parts.
4 is a cross-sectional view taken along line AA in FIG.
FIG. 5 is a longitudinal sectional view showing a lead feeding operation.
FIG. 6 is a longitudinal sectional view showing the rotation operation of the core.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Core tank 3 Chuck body 4 Chuck ring 5 Center detent member 6 Tip member 7 Chuck spring 8 Slider 9 Vertical rib 10 Protrusion 11 Cam part 12 Vertical protrusion 13 Vertical groove part 14 Inclined surface 15 Rotor 16 Repulsion Member 17 Vertical projection 18 Inclined surface 19 Through hole 20 Recess 21 Projection 22 Spring receiver 23 Eraser 24 Eraser holder
25 knock cap

Claims (1)

A sharp pencil in which a chuck body for gripping and releasing a core is disposed in a shaft cylinder, and the core is drawn out by a forward movement of the chuck body, and the chuck is moved by a backward movement of the core held by the chuck body. The chuck body rotating means includes a slider, a rotor that contacts the slider, and a cam portion provided on the inner wall surface of the shaft cylinder. A chuck ring that opens and closes the chuck body at the front portion of the chuck body, and the slider is brought into contact with the rear end of the chuck ring directly or via a core, A rotor that moves as the slider moves is brought into contact with the slider, and further, the slider, a chuck body positioned in front of the slider , and the rotor by a resilient member. Biased forward In addition, with some not rotate the slider relative to the barrel but allows the movement back and forth, a lead tank is fixed to the rear of the chuck body, the lead tank of the rotor to the lead tank A sharp pencil, which is non-rotatable but can be moved back and forth.

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