JPS641102Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The invention relates to a sharp pencil that allows the lead to be extended while writing without changing the gripping position of the main body.
This invention relates to a sharpening pencil in which a lead core is drawn out by swinging the sharpening pencil in the longitudinal direction.

(Prior art and its problems) A sharpening pencil whose lead core is drawn out by gripping the pencil in the longitudinal direction is known from Japanese Patent Application Laid-Open No. 53-69728, but this is not disclosed here. In the case of a sharp pencil, the vibration of the shaft first moves the movable body forward against the elastic force of the spring 7, and the forward movement of the movable body presses and advances the chuck that holds the lead, and then the forward movement of the chuck pushes the sliding body forward. advance, pull out the lead from the expanding chuck while holding the lead between the balls 19 disposed in the sliding body, and advance the lead against the lead holding force of the lead holder to feed out the lead. The structure is complicated, and the series of operations is unreliable, so it cannot be said to be very practical for reliably feeding out the lead.

(Purpose of the invention) This invention was created in view of the problems mentioned above.
To provide a sharpening pencil capable of reliably drawing out a lead core by shaking the sharpening pencil in the longitudinal direction.

(Structure of the invention) The present invention will be described in detail below based on embodiments shown in the accompanying drawings.

In Fig. 1, reference numeral 1 indicates the sharp pencil main body, and the tip member, front barrel, connecting member, and rear barrel indicated by reference numerals 2, 3, 4, and 5 are connected by press-fitting or screwing, respectively. It is structured by this. A hole 6 is provided in the tip member 2, and a lead core holding member A, designated by reference numeral L, is fixed therein to slidably and elastically hold the lead core. A lead core guide tube 7 that communicates the hole 6 with the outside and guides the lead core L is fixed thereto. A cylinder body designated by reference numeral 8 is movably arranged within the front shaft cylinder 3. A tapered portion 9 whose diameter increases toward the front is provided on the rear outer periphery of the cylindrical body 8, and between the tapered portion 9 and the inner wall of the front shaft cylinder 3, a rolling element such as a cylinder or a sphere is provided. The following engaging members 10 are arranged. (Although only two engaging members 10 are shown in the figure, the number of engaging members 10 can be selected as appropriate.) Also, on the front inner surface of the cylindrical body 8, there is a large diameter shaft facing forward. Tapered part 1
1, and the tapered portion 11 has a lead core that can be elastically opened and closed in the axial direction of a lead gripping member, such as a collection chuck, indicated by the reference numeral 12, which is movably disposed within the cylindrical body 8. The grip portion 13 is brought into contact with a cylindrical or spherical rolling element 14. A resilient member 15 made of a spring or the like is interposed between the lead core gripping member 12 and the cylindrical body 8, and the elastic force of the resilient member 15 causes the lead core gripping portion 13 to be pushed into the tapered portion 11. It is designed so that it can be pressed down to reduce its diameter. Members denoted by reference numerals 16 are attitude control members arranged in the annular groove 17 provided in the cylinder 8, with a portion thereof abutting against the inner wall of the front shaft cylinder 3. The engaging member 10 is provided between the cylinder body 8 and the front shaft cylinder 3 and is movable relative to either of them.
A release member 19 provided with a hole 18 through which ... is inserted.
are arranged. The member designated by reference numeral 20 is a C-shaped ring having elasticity in the axial direction with a notch 21, and its inner diameter when no external force is applied is the same as the tip of the lead core storage cylinder 22, which will be described later. The diameter is smaller than the outer diameter. The member indicated by reference numeral 22 is a lead core storage cylinder for storing a spare lead core inside, and a hole 23 for supplying lead cores one by one to the lead gripping member 12 is bored in its front end surface. It has been done. Further, an outer flange 24 is provided at the rear of the lead core storage cylinder 22, and a resilient member 2 such as a spring is interposed between the outer flange 24 and the connecting member 4.
5, the outer flange 24 is resiliently repelled and abutted against a step 26 provided on the inner surface of the rear shaft cylinder 5.
A cylinder body designated by reference numeral 27 is connected to the rear part of the lead core housing cylinder 22, and a knob member 28 protruding outward from the rear end of the rear shaft cylinder 5 is fitted into the cylinder body.

(effect) Next, the operation of this embodiment will be explained.

As shown in FIG. 1, when the front end surfaces of the lead guide tube 7 and the lead lead L are on the same plane (this state occurs when the lead lead is worn out due to continued writing or when the lead lead is stored). ) In order to write, it is necessary to extend the lead L to a position where it protrudes from the front end of the lead guide tube 7. The aforementioned lead core L in this example
The feeding can be achieved by the following action.
That is, if the main body 1 is swung forward in the longitudinal direction, an inertial force acts on the cylindrical body 8 when the swinging is stopped, so that the cylindrical body 8 does not move forward relative to the main body 1. The above-mentioned penetrating force of the cylinder body 8 acts in the direction of releasing the contact with the tapered part 9, the engaging member 10, and the inner wall of the front shaft cylinder 3, and the contact between these parts is caused by the above-mentioned engagement. Since the members 10 are rolling elements, they can be easily released by the force in the above-mentioned direction, so the cylinder 8 moves forward with respect to the main body 1. On the other hand, the diameter of the lead gripping part 13 in the cylinder 8 is reduced by the elastic force of the elastic member 15 and the tapered part 11, and grips the lead lead L.
is elastically held by the lead core holding member A, so the gripping force of the lead core holding portion 13 on the lead core L increases due to the movement of the cylinder 8, and therefore the lead core L is held in place by the lead core holding member A. The lead core guide tube 7 is moved forward against the holding force of the holding member A until the front end surface of the cylinder body 8 comes into contact with the rear end surface of the tip member 2 and stops.
It protrudes from the front end surface. As mentioned above, writing is performed using the protruding lead L, and when the lead L is pressed against the writing surface during writing, the pressing force is applied to the lead L and the lead grip that grips the lead L. Member 13
A cylindrical body 8 that abuts and locks with the lead core gripping member 13 via
This acts to move the main body 1 in the backward direction. When such a force is applied to the cylinder body 8, the tapered part 9 and the engagement member 10 in contact with the inner wall of the front shaft cylinder 3 are rotated so as to move to the large diameter part of the tapered part 9. , the cylindrical body 8 and the engaging member 1
0... and the inner wall of the front shaft cylinder 3 to create a wedge effect. Since this wedge action occurs at the same time as the above-described writing pressure is applied to the lead lead L, the lead lead L is instantly locked to the main body 1, making it possible to write. Next, the operation when the lead core L is further advanced from the state where the cylinder body 8 is located at the most advanced position will be explained. In this case as well, this is done by swinging the main body 1 in the longitudinal direction in the same manner as described above, but since the cylinder 8 is in the most advanced position, it must be moved backward first. To do this, it is necessary to swing the tube toward the rear of the main body 1, which is the opposite of the above, to generate an inertial force that causes the cylindrical body 8 to move rearward relative to the main body 1. At this time, when the cylindrical body 8 moves rearward, a wedge effect occurs due to the action of the engaging members 10, as described above, and the retreat is prevented, but the cylindrical body 8 and the front shaft cylinder 3 Since an inertial force acts on the release member 19 movably disposed between the locking member 19 and the releasing member 19, which causes the releasing member 19 to move backward, as shown in FIG.
0... is pressed by the end face of the hole 18 and rotated so as to move toward the small diameter part of the tapered part 9, thereby canceling the wedge effect and thus making it possible for the cylinder 8 to retreat. On the other hand, as the cylindrical body 8 moves forward, the lead gripping member 1 increases the gripping force of the lead lead L.
3, but depending on the movement in the opposite direction, the rolling element 14
... rotates so as to move to the large diameter portion of the tapered portion 11, the lead core gripping member 12 does not expand against the elastic force of the elastic member 15, and the lead core L
Reduce the gripping force. Therefore, the lead core holding member A
By appropriately setting the holding force of the lead core L, the lead core gripping member 13 can be made to retreat while sliding on the lead core L when the cylindrical body 8 is moved rearward. The rearward movement of the lead core gripping member 13 occurs when the release member 19 pressing the engagement members 10 stops contacting the connection member 4, and then the cylindrical body 8
As the engaging member 10 moves rearward, the engaging member 10 is rotated so as to move toward the large diameter part of the tapered part again, as shown in FIG. It is stopped by causing the movement to stop. Through this series of operations, the lead lead gripping member 12 grips a position behind the lead lead L held at the most advanced position. From this state, as described above, if an inertial force is applied to the cylindrical body 8 to move it forward, the lead core L will be drawn out. Furthermore, the operation of feeding out the lead core L by moving the lead core storage cylinder 22 forward and backward will be explained. (This action will cause the lead core L to be completely consumed and if the lead core L is not gripped by the lead core gripping member 12 or if there is no lead core L in front of the lead core gripping member 12, a new lead core L will be replaced. (It is necessary when feeding out the lead core L. Of course, the same effect is performed when the lead core L is gripped by the lead core gripping member 12.)
To explain from the state where the cylinder body 8 is in the most retracted position as shown in FIG. The tip of the lead core storage cylinder 22 presses the cylinder 8 through the ring 20 and moves it forward. The advancement of the cylinder 8 is stopped when it comes into contact with the rear end surface of the tip member 2 as described above, but the lead storage cylinder 22 is further advanced and the tip of the lead storage cylinder 22 is inserted into the ring 20. It fits into the ring 20 against the elasticity in the radial direction and presses the rear end of the lead gripping member 12 to move the lead gripping member 12 against the cylinder body 8 against the elastic force of the elastic member 15. advance. After the lead core storage tube 22 has been advanced a sufficient distance in this manner, when the pressing force on the lead core storage tube 22 is released, the lead core storage tube 22 returns to its original position due to the elastic force of the elastic member 25. However, along with this retreat, the ring 20 that is elastically fitted into the lead core housing cylinder 22 also retreats together. As the ring 20 retreats, the release member 19 also retreats, and the engagement members 10 are pressed by the retreat of the release member 19, releasing the contact between the tapered portion 9 and the inner wall of the front shaft cylinder 3. , and further end face engagement means 10 of hole 18.
The release member 19 is retracted until the cylindrical body 8 and... are engaged with each other. During the retraction of the release member 19 to the above-mentioned position, the lead gripping member 12 that comes into contact with the front part of the lead storage cylinder 22 is also retracted with respect to the cylinder body 8 by the elastic force of the elastic member 15. . At this point, the lead gripping member 12 has not reached the point where the lead core L is gripped, although the gripping portion 13 contacts the tapered portion 11 via the rolling element 14. The release member 19, the engagement means 10, the cylinder 8, and the lead core storage cylinder 22 and the ring 2
0. While maintaining the respective positional relationships of the lead core gripping members 12, that is, while maintaining the state in which the lead core gripping members 12 do not grip the lead core L, the lead core storage cylinder 22 is further retreated and the release member is released. 19 comes into contact with the connecting member 4 and is stopped from retreating, thereby separating from the ring 20, and the outer flange 24 comes into contact with the stepped portion 26 to stop the retreating. After the release member 19 stops retreating, the lead core gripping member 12 starts to retreat with respect to the cylinder body 8 due to the elastic force of the elastic member 15 as the lead core storage cylinder 22 retreats, and the gripping part 13 The tapered portion 11 cooperates to grasp the lead core L and stop the retreat. If the lead storage cylinder 22 is moved forward and backward relative to the main body 1 in this way, the lead gripping member 12 will move forward while gripping the lead L when moving forward, and will hold the lead L when retreating. Since the lead core L is moved back while being released and the lead core L is gripped again at the most retracted position, the lead core L is fed out to the main body 1. However, the feeding out of the lead core L by the forward and backward movement of the lead core storage cylinder 22 described here is outside the scope of the present invention, and is performed by simply pressing the lead gripping member 12 with the front part of the lead lead storage cylinder 22. It is also possible to replenish the lead core L by expanding it and inserting a new lead core L from the front of the tip member 2.

(Effect) A main body; a cylinder disposed movably within the main body and having a tapered portion on its outer periphery that becomes larger in diameter toward the front; a cylinder disposed within the cylinder and interposed between the cylinder a lead core gripping member which is resiliently repelled by a resilient member and grips the lead core; an engaging member comprising a rolling element disposed so as to be engageable between the tapered portion of the cylindrical body and the inner wall of the main body; a release member movably arranged between the main body and the cylindrical body and capable of pushing the engagement member backward; a lead holding member arranged at a main body position in front of the lead holding member; By swinging the main body forward in the longitudinal direction, the cylinder moves forward with respect to the main body, and the lead core gripped by the lead gripping member inside the cylinder moves forward against the holding force of the lead holding member. According to the present invention, the lead lead can be reliably fed out by simply shaking the main body in the longitudinal direction without changing the gripping position of the main body while writing. This simplifies the operation for feeding out the lead, which has a great practical effect.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view showing the present invention, Figures 2 and 3.
The figure is a longitudinal sectional view of a main part showing the operation of the release member. 1... Main body, 8... Cylindrical body, 9... Taper part,
10... Engaging member, 12... Lead core gripping member, 15
... Resilient member, 18 ... Hole, 19 ... Release member,
A...Lead core holding member.

Claims (1)

[Scope of utility model registration request] a main body; a cylinder disposed movably within the main body and having a tapered portion on the outer periphery that becomes larger in diameter toward the front; an elastic repellent disposed within the cylinder and interposed between the cylinder and the cylinder; a lead core gripping member which is resiliently repelled by the member and grips the lead core; an engaging member comprising a rolling element disposed so as to be engageable between the tapered portion of the cylindrical body and the inner wall of the main body; and the main body; a release member that is movably arranged between the cylindrical body and capable of pushing the engagement member backward; and a lead holding member that is arranged at a position in front of the main body of the lead gripping member, and the main body is held in a longitudinal direction. By swinging it forward in the direction, the cylinder is moved forward with respect to the main body, so that the lead core held by the lead gripping member inside the cylinder can be advanced against the holding force of the lead core holding member. A sharp pencil featuring the following.