JP3870476B2 - Side knock type pencil - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a retractable sharp pencil in which a middle shaft set having a core feeding mechanism is slidably disposed inside a shaft cylinder.
[0002]
[Prior art]
One example is Japanese Utility Model Publication No. 53-15639. By pushing the knock cover arranged at the rear end of the sharp pencil main body, the internal mechanism having the core feeding mechanism is protruded from the tip, and by pushing the knock cover, the core feeding mechanism is operated to move the core. It is something to pay out.
[0003]
[Problems to be solved by the invention]
However, in the prior art as described above, the gripping method at the time of writing and the gripping method at the time of retracting the internal mechanism or when feeding the core must be changed, which is very troublesome. there were. In other words, when writing, holding the sharp pencil body with the thumb, forefinger, middle finger, etc., while pushing the knock cover with the thumb when the internal mechanism is raised or lowered or the core is extended, the other four The finger will grip the sharp pencil body. Here, a “pick up” operation of the sharp pencil body occurs.
[0004]
[Means for Solving the Problems]
The present invention has been made in view of the above problems, and is a retractable sharp pencil in which a central shaft set having a core feeding mechanism having at least a resilient member as a constituent element is slidably disposed inside the shaft tube. In addition, a window hole is formed in the side wall of the shaft tube, the middle shaft set is projected and retracted in the window hole, a knock piece for operating the core feeding mechanism is disposed, and the middle shaft set is projected and retracted. An engaging / releasing means for maintaining or releasing the state is disposed, the elastic member is disposed in front of the engaging / releasing means, and the engaging / releasing means is provided on the middle shaft set. The gist is that it is configured by engaging the angled inclined surface of the member and the angled inclined surface of the rotor, or by engaging the heart-shaped groove of the rotor and the projection of the shaft cylinder. .
[0005]
【Example】
A first example will be described with reference to FIGS. A through hole 2 is formed in the middle portion of the side wall of the shaft cylinder 1 in the rear (hereinafter, the upper side in the drawing is referred to as the rear) in an elliptical shape. A knock piece 3 which is a mold and has an elliptical shape at the back is attached to the shaft tube 1 so as to be movable in a radial direction perpendicular thereto.
Further, the pressing operation surface portion of the knock piece 3 is composed of a flat portion 3a and a raised portion 3b so that the entire shape of the knock piece 3 when the pressing operation is performed can be confirmed. That is, the raised portion 3b serves as a finger stopper when pressed, and the center portion of the knock piece 3 can be pressed.
Further, as shown in FIG. 4, the positional relationship between the knock piece 3 and the shaft cylinder 1 does not immerse into the shaft cylinder 1 even when the knock piece 3 is completely pressed. Specifically, when the knock piece 3 is fully pressed, the flat portion 3a of the knock piece 3 and the surface of the outer diameter of the shaft tube 1 are the same.
[0006]
A notch 5 is formed in the middle of the side wall 4 of the knock piece 3, and a front inclined surface 6 is formed at the front end of the side wall 4 of the knock piece 3. The side wall of the knock piece 3 formed by the notch portion 5 and the front inclined surface 6 serves as the first engagement portion 7. A rear inclined surface 8 is also formed on the rear surface of the notch 5, and the side wall of the knock piece 3 formed by the rear inclined surface 8 and the elliptical rear end portion 9 of the knock piece 3 is the first. 2 engaging portions 10.
Reference numeral 11 denotes an engaging claw formed on the side surface of the bottom surface portion of the knock piece 3 and prevents the shaft piece 1 from falling off.
[0007]
A middle shaft set 13 urged rearward by a resilient member 12 such as a coil spring is slidably disposed in front of the shaft cylinder 1, and a slide member 14 is disposed behind the middle shaft set 13. It is fixed. A notch portion 15 is formed in an intermediate portion of the slide member 14, and a first engagement that engages with the first engagement portion 7 of the knock piece 3 is forward of the notch portion 15. It is a receiving part 16. An intermediate inclined surface 17 is formed at the rear end of the first engagement receiving portion 16 and is engaged with the front inclined surface 6 of the first engaging portion 7. Further, a rear side of the notch 15 is a second engagement receiving portion 18 that engages with the second engagement portion 11 of the knock piece 3. A rear end inclined surface 19 is formed at the rear end of the second engagement receiving portion 18 and is engaged with the intermediate inclined surface 8 of the second engaging portion 10 of the knock piece 3.
More specifically, the first engagement portion 7 of the knock piece 3 is positioned in a state of being sandwiched by the notch portion 15, and the second engagement receiving portion 18 is The knock piece 3 is located in a state of being sandwiched between the first engagement portion 7 and the second engagement portion 10. In addition to preventing the knock piece 3 from rotating when the knock piece 3 is pressed, the force for performing the pressing operation is reduced by distributing the pressing force to the respective engaging portions.
[0008]
A core receiving member 20 having an outer shape substantially the same as the inner shape of the shaft tube 1 is press-fitted behind the slide member 14. The inner side of the core receiving member 20 is formed in a funnel shape so that the core can easily fall, and a core insertion hole is formed at the lower end of the funnel-shaped portion. The inner diameter of the core insertion hole is substantially the same as the outer diameter of the core. In other words, the inner side of the shaft cylinder 1 with respect to the core receiving member 20 serves as a core tank portion 21.
On the other hand, a plurality of angled inclined surfaces 22 are continuously formed at the front end of the slide member 14. Further, a protrusion 23 is formed on the outer peripheral surface located at the top of the angled inclined surface 22, and an angled inclined surface 24 is also formed at the rear end of the protrusion 23.
In addition, a rotor 25 that slides and rotates in the shaft cylinder 1 is disposed in front of the slide member 14. Further, a mountain-shaped inclined surface 26 is also formed at the rear end of the rotor 25 so that it can engage with the mountain-shaped inclined surface 22 of the slide member 14. Further, every other protrusion 27 is formed on the outer peripheral surface of the rotor 25 with respect to the angled inclined surface, and the rear end of the protrusion 27 is an inclined surface 28 (see FIG. 2).
[0009]
Here, on the inner surface located in front of the slider-member 14 of the shaft cylinder 1, there are a high vertical projection 29, a low vertical projection 30, a high vertical projection 29, a groove 31, a high vertical projection 29. Inclined surfaces 29a and 30a are formed at the front ends of the vertical projections 29 and 30, respectively.
[0010]
Next, the middle shaft set 13 will be described. An outer cylinder 32 urged rearward by the spring 12 is disposed in front of the rotor 25 in a contact state. A chuck body 34 having a front end fitted with a chuck ring 33 is fixed inside the outer cylinder 32, and a core guide member 35 having a rear end fixed to the slide member 14 is disposed. Needless to say, the chuck body 34 releases and grips the core, and the chuck ring 33 opens and closes the chuck body 34. A front member 37 having a core detent member 36 provided therein is detachably fixed to the front end of the outer cylinder 32.
Reference numeral 38 denotes an elastic member such as a coil spring that urges the chuck body 34 and the like backward.
Reference numeral 28 denotes a tip member that is detachably fixed to the front end of the barrel 1.
[0011]
Next, the operation will be described. When the knock piece 3 is pressed in the radial direction from the state shown in FIG. 1 (in the state where the middle shaft set 13 is immersed), the slide member 14 moves forward against the resilience of the resilient member 12, and the rotor 25 and the middle shaft set 13 are moved. Advance. At this time, the protrusion 27 of the rotor 25 advances while sliding in the vertical groove 31 and eventually reaches the top (inclined surface 29a) of the vertical protrusion 29 (see FIG. 4). When the inclined surface 29a is reached, the rotor 27 is rotated by the inclined surface, and is guided to abut against the inclined surface 30a of the vertical protrusion 30 while rotating and retracting. As a result, the middle shaft set 13 is in a protruding state, and immersion is prevented by the contact (see FIG. 5).
Next, when the lead is extended, the knock piece 3 is pressed again. This pressing operation may be small. Then, by this small pressing operation, the guide member 35 moves forward, the chuck body 34 moves forward / expands, and the lead is fed out.
[0012]
Here, when it is desired to immerse (store) the middle shaft set 13 in the shaft cylinder 1, the knock piece 3 is largely pressed again. Then, the slider member 14 advances the rotor 25 and the middle shaft set 13 again, and the protrusion 27 of the rotor 25 eventually reaches the inclined surface 29a of the protrusion 29. At this time, the rotor 25 rotates, the projection 27 is coaxial with the groove 31, and is pushed back by the elastic member 12. Thus, the middle shaft set 13 is in an immersive state.
[0013]
A second example will be described with reference to FIGS. This is an example in which the intruding means of the middle shaft set 13 is changed. In the first example, the center shaft set is projected and retracted by a generally called deviant cam rotation cam mechanism. In the second example, a heart-shaped groove is formed on the outer periphery of the rotor 39. 40, and a protrusion 41 that engages with the groove 40 is formed on the inner surface of the shaft tube 1.
When the knock piece 3 is pressed from the state where the middle shaft set 13 is immersed, the slider member 14 advances the rotor 39. The rotor 39 is rotated by the engagement between the groove 40 and the protrusion 41 while moving forward, and the concave portion 42 of the rotor 39 is engaged with the protrusion 41 in due course. This prevents the middle shaft set 13 from protruding and retreating. The lead feeding operation is the same as in the first example.
[0014]
A third example will be described with reference to FIG. This is an example in which a feeding-type eraser 43 is attached to the rear end of the sharp pencil of the first example. The feed-out type eraser 43 moves up and down along the spiral groove 45, a rod-shaped body guide member 44 that is detachably fixed to the rear end of the barrel 1, an outer cap 46 in which a spiral groove 45 is formed on the inner surface, and the spiral groove 45. An eraser receiving member 48 to which an eraser 47 to be attached is attached. When the shaft cylinder 1 and the outer cap 46 are relatively rotated, the eraser receiving member 48 moves up and down, and the eraser 47 moves up and down accordingly.
In particular, the side knock type sharp pencil is effective for the sharp pencil in which the eraser is arranged at the rear end. This is because the knocking operation can be performed without touching the eraser.
[0015]
A fourth example will be described with reference to FIGS. This is an example in which the sharp pencil of the first example is a so-called knockback type. A chuck ring 33 is surrounded in front of the chuck body 34, and a step portion 49 that restricts the advance of the chuck ring 33 is formed in front of the chucking 33. These configurations are the same as those in the first example. In this example, a second ring 51 urged rearward by the elastic member 50 is disposed in front of the stepped portion 49 and behind the core detent member 38 (see FIG. 9).
In this state, when a knocking operation is performed, the chuck body 34 moves forward while gripping the core, and the chuck ring 33 eventually contacts the stepped portion 49 (see FIG. 10). When the pressing operation is further performed, the forward movement of the chuck ring 33 is restricted, so that the chuck body 34 expands and opens the core. Here, when the knocking operation is released, the chuck body 34 again grips the lead and prevents the lead from moving backward (see FIG. 9).
When it is desired to store the lead after the writing, the above knocking operation is frequently performed. By increasing the knocking operation amount, the chuck body 34 advances greatly. By this advancement, the head of the chuck body 34 is fitted into the second ring 51 and the core is gripped (see FIG. 12). When the knocking operation is released in this state, the chuck body 34 moves backward while holding the lead, and the lead is stored (see FIG. 13). The chuck body 34 is released from the second ring 51 halfway, but is finally closed by the chuck ring (see FIG. 14).
[0016]
【The invention's effect】
The present invention is a retractable sharp pencil in which a central shaft set having a core feeding mechanism having at least a resilient member as a constituent element is slidably disposed inside a shaft cylinder, and a window hole is formed in a side wall of the shaft cylinder. And an engaging / releasing means for maintaining or releasing the protruding and retracting state of the center shaft set, and arranging a knock piece for operating the core feeding mechanism. And the elastic member is arranged in front of the engaging / releasing means, and the engaging / releasing means is mounted on the central shaft set with the angled inclined surface of the slide member and the angled inclined surface of the rotor. Or by engaging the heart-shaped groove of the rotor with the projection of the shaft cylinder, so that the middle shaft set is moved in and out and the core is extended by the same gripping method as in writing. Can do the operation .
[Brief description of the drawings]
FIG. 1 is a vertical sectional view of a part of the present invention showing the present invention.
FIG. 2 is an external perspective view of a main part of FIG.
3 is a longitudinal sectional view of the main part of FIG.
FIG. 4 is a longitudinal sectional view showing an operation.
FIG. 5 is a longitudinal sectional view showing the operation.
FIG. 6 is an external vertical sectional view of a part showing a second example.
7 is an external perspective view of the main part of FIG. 7. FIG.
FIG. 8 is an external vertical sectional view of a part showing a third example.
FIG. 9 is a longitudinal sectional view of an essential part showing a fourth example.
10 is a longitudinal sectional view of a main part showing the operation of FIG. 9;
FIG. 11 is a longitudinal sectional view of an essential part showing the operation of FIG. 9;
12 is a longitudinal sectional view of a main part showing the operation of FIG. 9;
13 is a longitudinal sectional view of the main part showing the operation of FIG. 9;
14 is a longitudinal sectional view of the main part showing the operation of FIG. 9;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Through-hole 3 Knock piece 3a Flat part 3b Raised part 4 Side wall 5 Notch part 6 Front inclined surface 7 First engaging part 8 Rear inclined surface 9 Rear end part 10 Second engaging part 11 Engagement Joint nail 12 Repellent member 13 Middle shaft set 14 Slide member 15 Notch portion 16 First engagement receiving portion 17 Intermediate inclined surface 18 Second engagement receiving portion 19 Rear end inclined surface 20 Core receiving member 21 Core tank portion 22 Angled surface 23 Projection 24 Angled surface 25 Rotor 26 Angled surface 27 Projection 28 Angled surface 29 Vertical projection 30 Vertical projection 31 Vertical groove 32 Outer cylinder 33 Chuck ring 34 Chuck body 35 Core guide member 36 Core detent member 37 Tip Member 38 Repellent member 39 Rotor 40 Groove 41 Protrusion 42 Recess 43 Eraser 44 Rod-shaped body guide member 45 Spiral groove 46 Outer cap 47 Eraser 48 Eraser receiving member 49 Part 50 Tamabachi member 51 the second ring

Claims (1)

A retractable sharp pencil in which a middle shaft set having a core feeding mechanism having at least a resilient member as a constituent element is slidably disposed inside the shaft tube, and a window hole is formed in a side wall of the shaft tube, The middle shaft set is projected and retracted in the window hole, and a knock piece for operating the core feeding mechanism is disposed, and engagement / release means for maintaining or canceling the projected and retracted state of the middle shaft set is disposed, The elastic member is disposed in front of the engaging / releasing means, and the engaging / releasing means is engaged with the angled inclined surface of the slide member provided on the center shaft set and the angled inclined surface of the rotor. Or a side knock type sharp pencil characterized in that it is formed by engaging the heart-shaped groove of the rotor and the projection of the shaft cylinder .

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