JP2004255756A - Mechanical pencil of shaking out type - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mechanical pencil of a shaking out type wherein though a gap is generated between a front stage of a connector 2 and a front end of a refill tank 3 by impact force when a heavy weight body 1 abuts against the connector 2, the refill tank 3 is always press-fitted in an outer collar 2C of the connector 2 and even when a mechanism part is taken out from a barrel cylinder 1, the tank 3 never comes off from the connector 2. <P>SOLUTION: The mechanical pencil of a shaking out type runs out a lead 10 by advancing a chuck 1 by inertia force of the heavy weight body 12 to be generated by shaking the barrel cylinder 7. A distance L2 from a stage part of the connector 2 touching the front edge of the refill tank 3 to the outer collar 2C is set longer than a separate distance L1 from a rear end of the refill tank 3 under a state wherein the chuck 1 holds the lead 10 to a stage part of a pressing component 16. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a swing mechanical pencil that advances a chuck by an inertial force of a weight body to feed out a lead.
[0002]
[Prior art]
In a conventional swing-out mechanical pencil, a rear portion of a connector connected to a chuck is formed in a cylindrical shape, and a lead tank is fixed to the rear portion configured as described above by press fitting or the like. (See Patent Document 1)
[0003]
[Patent Document 1]
Utility model registration No. 2606820 [0004]
[Problems to be solved by the invention]
However, in the conventional swing-type mechanical pencil described above, a gap is generated between the outer flange of the connector and the front end of the core tank due to the impact when the weight body contacts the outer flange of the connector. Could come off. Further, even if it does not come off, there is a possibility that the core tank may come off from the connector when the base is removed from the barrel and the mechanical portion including the chuck, the connector, and the core tank is removed from the barrel.
[0005]
An object of the present invention is to provide a swing-out mechanical pencil that solves the above-mentioned problems.
[0006]
[Means for Solving the Problems]
The present invention provides a swing type mechanical pencil in which a chuck is advanced by an inertial force of a weight body generated by shaking a barrel to feed out a lead, an outer flange is formed at a rear portion of a connector connected to the chuck, and a rear portion of the connector is formed at a rear portion of the connector. The core tank is press-fitted and fixed, and the rear end of the core tank and the step of the pressing member are appropriately separated from each other.The chuck measures the distance from the step of the connector in contact with the front end of the core tank to the outer flange. The separation distance from the rear end of the core tank in the held state to the step of the pressing member is set to be larger than that, and when the pressing member is advanced, the step of the pressing member abuts the rear end of the core tank, and the core together with the pressing member The first point is that the tank, the connector, and the chuck advance.
[0007]
Also, two outer flanges are formed at the rear part of the connector, and the distance from the step of the connector in contact with the front end of the core tank to the outer flange positioned on the rear side in the longitudinal direction is determined by the core tank with the chuck holding the core. The second point is that the distance from the rear end to the step of the pressing member is set to be larger than that.
[0008]
【Example】
Hereinafter, the swing-out mechanical pencil according to the present invention will be described with reference to FIGS. 1, 2, 3 and 4. In addition, let the left side of FIG. 1 be front, and let the right side be back. First, a polyacetal connector 2 is press-fitted and fixed to a rear portion of a metal chuck 1 made of brass or the like. As shown in FIG. 5, the connector 2 has a flange 2A at a substantially middle portion and an outer flange 2C having a vertical front surface and an inclined rear surface at a rear portion 2B of the flange portion 2A. Note that the step portion of the connector 2 is also used by the flange portion 2A. The rear part 2B of the connector 2 is press-fitted and fixed to the front part of the core tank 3 made of a polypropylene pipe material, and the flange 2A of the connector 2 contacts the front end of the core tank 3. Since the connector 2 made of polyacetal is harder than the core tank 3 made of polypropylene, the connector 2 can be firmly connected to the core tank 3. Further, a tightening ring 4 is externally fitted to the head 1A of the chuck 1, and a spring 6 is stretched between the connector 5 for receiving the tightening ring 4 and the connector 2.
[0009]
The front hole 7A of the shaft cylinder 7 is configured so that the core tank 3 and the connector 2 can be inserted therethrough. Further, a rubber grip 8 for preventing slippage is fitted to the front narrow diameter portion 7B of the shaft cylinder 7. The core tank 3 is inserted from the front of the shaft cylinder 7, and the connecting tool 5 is sandwiched between the front end of the shaft cylinder 7 and the inner step 9A of the base 9 screwed to the front end of the shaft cylinder 7. The rubber grip 8 is held between the rear end of the base 9 and the outer step 7C of the shaft cylinder 7. The base 9 has a built-in lead holder 11 made of an elastic material such as rubber for holding the lead 10 with an appropriate force.
[0010]
The weight body 12 is formed of a metal cylinder, and the weight body 12 is slidably housed in an inner hole 7D opened from the rear end of the shaft cylinder 7 and having a larger diameter than the front hole 7A. . The core tank 3 is inserted into the through hole 12A of the weight body 12.
[0011]
The crown 13 shown in FIG. 6 has a clip 14 integrally formed on the upper side and a small-diameter portion 13A formed on the front. A projection 13B is formed on the outer peripheral surface of the small diameter portion 13A immediately below the clip 14, and opening windows 13C extending in the longitudinal direction are formed on both sides of the small diameter portion 13A so as to face each other. The small diameter portion 13A where the 13B is located is configured to be elastically deformable as appropriate. An inner flange 13D for preventing lateral movement of the core tank 3 is formed inside the front crown 13 at the front, and a step 13E for contacting the return spring 15 is formed inside the rear. . Further, a key groove 13G is formed above and below the rear hole 13F of the crown 13 so as to face the opening window 13C at a position shifted by 90 degrees from the axis.
[0012]
As shown in FIGS. 7 and 8, projections 16B are formed on both sides of the outer peripheral surface of the front cylinder 16A of the pressing member 16, and opening windows 16C are opposed to the upper and lower sides of the front cylinder 16A. The front tube 16A, which is formed and on which the protrusion 16B is located, is configured to be elastically deformable. An outer flange 16D is formed at the rear of the pressing member 16, and a key 16E is formed above and below the outer flange 16D so as to protrude outward from the projection 16B at a position shifted by 90 degrees with respect to the axis. Is done. Further, an inner flange 16F having a core insertion hole is formed on the inner surface of the pressing member 16, and the front surface of the inner flange 16F serves as a pressing surface for pressing the rear end of the core tank 3. After the return spring 15 is fitted to the front of the pressing member 16, the key 16 E of the pressing member 16 is inserted into the key groove 13 G of the crown 13 from behind the head crown 13, and the projection 16 B of the pressing member 16 is inserted. Is loosely fitted to the opening window 13C of the crown 13 so as to be slidable in the longitudinal direction. When the return spring 15 is stretched between the step 13E of the crown 13 and the outer flange 16D of the pressing member 16, the pressing member 16 is normally urged rearward in the longitudinal direction. Moreover, the rear part of the core tank 3 is inserted into the front inner hole 16G of the pressing member 16, and the rear end of the core tank 3 and the pressing surface of the pressing member 16 are separated from each other.
[0013]
The distance L1 between the rear end of the core tank 3 and the pressing surface of the pressing member 16 when the chuck 1 holds the core 10 is smaller than the distance L2 from the flange 2A of the connector 2 to the outer flange 2C. .
[0014]
Further, an eraser 17 is fitted and attached to the rear inner hole 16H of the pressing member 16, and a knob 18 covering the eraser 17 is fitted to the rear outer surface 16I of the pressing member 16 as shown in FIGS. State. The crown 13 thus assembled is inserted from the rear end of the barrel 7, and the raised portion 13H of the crown 13 is moved forward with the concave groove 7E extending longitudinally forward from the rear end of the barrel 7. Then, the projection 13B of the crown 13 is fitted into the locking window 7F formed on the rear upper surface of the barrel 7, and the crown 13 is attached to the barrel 7. Moreover, since the locking window 7F of the barrel 7 and the projection 13B of the crown 13 are hidden by the clip 14, the appearance is not impaired. The rear part of the core tank 3 is inserted through the inner flange 13D of the crown 13, and the sliding movement of the weight body 12 in the longitudinal direction is restricted by the flange 2A of the connector 2 and the inner flange 13D of the crown 13. Is done.
[0015]
In the swing-out mechanical pencil described above, the inertial force acts on the weight body 12 by shaking the shaft cylinder 7, and the weight body 12 abuts on the flange 2 </ b> A of the connector 2. Then, the inertial force of the weight body 12 is transmitted to the connector 2, and the chuck 1 and the lead tank 3 are moved forward together with the connector 2, and a fixed amount of the lead 10 is fed out. At this time, a shock may occur between the flange 2A of the connector 2 and the front end of the core tank 3 due to the impact of the weight body 12 abutting on the flange 2A of the connector 2, but this gap is longer than the distance L1. Since the rear end of the core tank 3 comes into contact with the pressing surface of the pressing member 16, there is no possibility that the size will increase. Therefore, there is no fear that the core tank 3 will come off at least from the outer flange 2C of the connector 2. When the base 9 is removed from the barrel 7, and when the mechanical parts such as the chuck 1, the connector 2 and the core tank 3 are removed from the barrel 7, the connector is removed. Since the outer flange 2 </ b> C is press-fitted into the core tank 3, there is no possibility that the core tank 3 may come off from the connector 2.
[0016]
11 and 12 show another embodiment of the connector 102 of the present invention. The base 102D is formed by projecting to both sides at a substantially middle portion and cutting the upper and lower sides. The step of the connector 102 is also used by the base 102D. Two elastic pieces 102E are formed by extending substantially 45 degrees in the circumferential direction from the base 102D, and a protrusion 102F protruding rearward in the longitudinal direction is formed at the tip of each elastic piece 102E. Further, an outer flange 102C whose front surface is vertical and whose rear surface is inclined is formed on the rear portion 102B of the connector 102. In the case of this embodiment, the distance from the base 102D to the outer flange 102C is L2. The core tank is press-fitted and fixed to the rear portion 102B of the connector 102, but is press-fitted and fixed in a state where the front portion of the core tank is in contact with the base 102D of the connector 102.
[0017]
In the case of this embodiment, the impact force when the weight body abuts on the connector 102 is absorbed by the elastic piece 102E being bent, and at the same time, the inertial force of the weight body can be transmitted to the connector 102. Therefore, a gap is hardly generated between the base 102D of the connector 102 and the front end of the core tank, and the core tank is more difficult to be detached than the connector 102.
[0018]
FIG. 13 shows that the connector 202 and the core tank are more securely pressed and fixed by forming two outer flanges 202C of the connector 202. In the case of this embodiment, the distance L2 from the base 202D to the outer flange 202C located on the rear side in the longitudinal direction is larger than the distance L1.
[0019]
The weight is not limited to a metal cylinder, but may be a metal wire wound in a coil shape and a spring portion formed at the front thereof.
[0020]
【The invention's effect】
In the swing type mechanical pencil of the present invention described above, the distance L2 from the step of the connector to the outer flange is larger than the distance L1 from the rear end of the lead tank with the chuck holding the lead to the step of the pressing member. By setting, even if a gap is generated between the shoulder of the connector and the front end of the core tank due to the impact of the weight body, the rear end of the core tank comes into contact with the pressing surface of the pressing member, so a gap is generated beyond the distance of L1. I will not. Therefore, since the core tank is always press-fitted and fixed to the outer flange of the connector, there is an effect that there is no fear that the core tank comes off from the connector even when the base is removed from the barrel and the mechanism is taken out.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a swing-out mechanical pencil of the present invention.
FIG. 2 is a cross-sectional view taken along line AA of FIG.
FIG. 3 is a sectional view taken along line BB of FIG. 1;
FIG. 4 is a sectional view taken along line CC of FIG. 1;
FIG. 5 is a front view showing the connector in FIG. 1;
FIG. 6 is a front view showing a crown and a clip in FIG. 1;
FIG. 7 is a front view showing a pressing member in FIG. 1;
FIG. 8 is a plan view showing the pressing member of FIG. 7;
FIG. 9 is a front view showing a state where the crown, the pressing member, and the knob in FIG. 1 are assembled.
FIG. 10 is a sectional view of FIG. 9;
FIG. 11 is a front view showing another embodiment of the connector of the present invention.
FIG. 12 is a sectional view taken along line AA of FIG. 11;
FIG. 13 is a front view showing still another embodiment of the connector of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Chuck 2 Connector 2B Rear part 2C of connector 2 Outer flange 3 of connector 2 Core tank 7 Shaft cylinder 10 Core 12 Weight body 16 Pressing member 102 Connector 102B Rear part 102C of connector 102 Outer flange 202 of connector 102 Connector 202C Outer flange of connector 202

Claims (2)

In a swing type mechanical pencil that advances the chuck by the inertial force of the weight body generated by shaking the barrel and draws out the lead, an outer flange is formed at the rear of the connector connected to the chuck, and the lead tank is placed at the rear of this connector. Press-fitting and fixing, the rear end of the core tank and the step of the pressing member are appropriately separated from each other, and the distance from the step of the connector in contact with the front end of the core tank to the outer flange is determined by the state in which the chuck holds the core. When the pressing member is advanced, the step portion of the pressing member abuts the rear end of the core tank, and the core tank and the connector together with the pressing member are set. A swing type mechanical pencil characterized in that the chuck and the chuck advance. Two outer collars are formed at the rear of the connector, and the distance from the step of the connector that contacts the front end of the core tank to the outer collar located on the rear side in the longitudinal direction is determined by the distance after the core tank with the chuck holding the core. 2. The mechanical pencil according to claim 1, wherein the distance from the end to the step of the pressing member is set to be larger than the distance.

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