JPH11180091A - Tip chuck type mechanical pencil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tip chuck type mechanical pencil which can be constituted in an easily grasping shape without fear of impairing an external appearance without increasing a diameter of a barrel. SOLUTION: In a tip chuck type mechanical pencil comprising a tip chuck 4 for holding a lead 11, and a feeding chuck 5 disposed longitudinally rear of the chuck 4 to feed the lead 11 by forwarding; an inner barrel 3 is fixed to a rear part of a peripheral wall 3C of the barrel 3. A locking dowel 8 is press fixed to a fixed hole 3D formed at the wall 3C of the barrel 3, and a leg 8A formed at the dowel 8 is projected inward from a hole inner surface 3E of the barrel 3. Further, a clamper 6 externally engaged with the head 5 of the chuck 5 is loosely engaged between the leg 8A of the dowel 8 and a locking step 3 of the barrel 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical chuck having a tip chuck for holding a lead, and a tip chuck type pencil provided with a feeding chuck for fitting a fastening ring to the head and feeding the lead by a predetermined amount.

[0002]

2. Description of the Related Art Conventionally, as a tip chuck type mechanical pencil capable of writing even with a shortened lead, an inner cylinder 203 is press-fitted and fixed to a tip chuck 4 as shown in FIG. The locking piece 208 was engaged and attached. The locking step 208 between the locking piece 208 and the inner cylinder 203
A tip chuck type mechanical pencil in which a fastener 106 which is externally fitted to the feeding chuck 5 is loosely fitted is known.

[0003]

However, the mechanical chuck of the tip chuck type shown in FIG. 12 has an inner cylinder 203 for engaging and attaching a locking piece 208 inside the inner cylinder 203.
When the inner cylinder 203 was made of a synthetic resin, the outer diameter became particularly large, which was not feasible. SUMMARY OF THE INVENTION An object of the present invention is to provide a tip chuck mechanical pencil that solves the above-mentioned problems.

[0004]

To achieve the above object, the present invention provides a shaft cylinder, a base provided at a front portion of the shaft cylinder,
A tip chuck that is built into the base and is urged rearward in the longitudinal direction to hold the lead, and a tip chuck that is located rearward in the longitudinal direction of the tip chuck and that feeds out the lead by moving forward. It is related to a mechanical pencil. In addition, the inner cylinder is fixed to the rear portion of the tip chuck, and a fixing hole is formed in the peripheral wall of the inner cylinder. A locking piece is press-fitted and fixed to the fixing hole of the inner cylinder, and a foot formed on the locking piece is projected inward from the inner surface of the inner hole of the inner cylinder. Furthermore,
A fastener externally fitted to the head of the feeding chuck is loosely fitted between the foot of the locking piece and the locking step of the inner cylinder to form a tip-tip mechanical pencil.

[0005]

FIG. 1, FIG. 2, FIG. 3, FIG. 4 and FIG. 5 show a first embodiment of the present invention. As shown in FIG. The sliding grooves 1A are formed so as to face each other up and down. Furthermore, an insertion groove 1B is formed so as to communicate with the rear end of the base 1 from each sliding groove 1A. The insertion groove 1B is formed so as to increase in width as it goes backward in the longitudinal direction. A metal tip fastener 2 is fixed to the tip opening of the base 1. In addition, the inner cylinder 3 made of synthetic resin
A protrusion 3B is formed at a relative position on the rear outer surface 3A, and a longitudinal front surface of the protrusion 3B is sharply formed. Further, a fixing hole 3D is formed in the peripheral wall 3C of the inner cylinder 3 so as to face vertically. At the front of the inner cylinder 3, a rear part of the tip chuck 4 made of metal such as brass is fixed. A fastener 6 is externally fitted to the head 5A of the feeding chuck 5, and a core tank 7 made of a resin pipe is fixed to a rear portion of the feeding chuck 5. As shown in FIG. 6, a locking piece 8 is press-fitted and fixed in the fixing hole 3D of the inner cylinder 3, and the foot 8A of the locking piece 8 is
It is configured to protrude more inward. A rear spring 9 is stretched between the locking piece 8 receiving the fastener 6 and the core tank 7, and the head 5 </ b> A of the feeding chuck 5 is pressed by the fastener 6.
The fastener 6 is slidably and loosely fitted between the locking step 3F of the inner cylinder 3 and the locking piece 8, and is normally pressed by the locking piece 8. A feeding chuck 5, a fastener 6, etc. are built-in, and a tip chuck 4 is provided at a front portion.
Is inserted from the rear end of the base 1, and the head 4A of the tip chuck 4 passes through the tip fastener 2 and protrudes from the tip. Further, the projection 3B of the inner cylinder 3 is inserted into the slide groove 1A through the insertion groove 1B of the base 1. Therefore, the projection 3B of the inner cylinder 3 is engaged with the rear end 1C of the sliding groove 1A,
The inner cylinder 3 is prevented from falling out of the base 1. A front spring 10 is provided between the inner stage 1D of the base 1 and the outer stage 3G of the inner cylinder 3.
The front chuck 10 urges the distal end chuck 4 rearward in the longitudinal direction. When the lead 11 is inserted into the tip chuck 4, the head 4 </ b> A of the tip chuck 4 is pressed and closed by the tip fastener 2, and holds the lead 11 firmly. A barrel 12 is screwed into the rear part of the base 1.
An opening window 12A is formed at the rear of the second window 2A. An elastic piece 13B is formed at the front part of the pressing member 13 by two notched grooves 13A extending in the longitudinal direction, and a projection 13C is formed on the elastic piece 13B.
Is formed. The front part of the pressing member 13 is inserted from the rear end of the barrel 12, and the projection 13C of the pressing member 13 is
Into the opening window 12A. The rear part of the core tank 7 is inserted into the front inner hole 13 </ b> D of the pressing member 13, and the lateral runout of the core tank 7 is regulated. An eraser 14 is provided inside the rear part of the pressing member 13, and a knob 15 that covers the eraser 14 is fitted to the rear outside of the pressing member 13.

In the above-described tip chuck type mechanical pencil of the first embodiment, the locking piece 8 is inserted into the fixing hole 3D formed in the peripheral wall 3C of the inner cylinder 3 from the side and fixed by press-fitting. The piece 8 is securely attached, and the inner cylinder 3
Has the advantage that the outer diameter of the is not increased.

FIGS. 7, 8 and 9 show a second embodiment of the present invention, in which sliding grooves 101A extending in the longitudinal direction are formed at the rear of a synthetic resin base 101 so as to face each other. . Further, a metal tip fastener 2 is fixed to the tip opening of the base 101. Further, fixing holes 10 opposed to each other are formed at the upper and lower positions on the peripheral wall 103C of the inner cylinder 103 made of synthetic resin.
3D is formed, and a concave portion 103H is formed in the upper half of the peripheral wall 103C. A rear part of the tip chuck 4 made of metal such as brass is fixed to a front part of the inner cylinder 103. A fastener 6 is externally fitted to the head 5A of the feeding chuck 5, and a core tank 107 is fixed to a rear portion of the feeding chuck 5. Elastic pieces 107B are formed vertically at the front of the core tank 107 by two notch grooves 107A extending in the longitudinal direction, and a projection 107C is formed on each of the elastic pieces 107B. Further, an eraser 114 is provided inside the rear part of the core tank 107, and a knob 115 covering the eraser 114 is fitted to the rear outside of the core tank 107. Locking piece 1
As shown in FIGS. 10 and 11, reference numeral 08 is formed from a front part in which a lower part of a disk is cut out and a semicylindrical rear part. The front part 108B of the locking piece 108 is press-fitted and fixed in the fixing hole 103D of the inner cylinder 103, and the foot 108A formed in the front part 108B of the locking piece 108 is It protrudes in the direction. Further, the rear portion of the locking piece 108 is
3H is fitted. Rear end of inner cylinder 103 and wick tank 107
A rear spring 109 is stretched between the projections 107C, and the head 5A of the feeding chuck 5 is pressed against the fastener 6.
The fastener 6 is loosely fitted slidably between the locking step 103F of the inner cylinder 103 and the locking piece 108, and is normally pressed by the locking piece 108. The inner cylinder 103, which incorporates the feed chuck 5, the fastener 6, etc., and has the front end chuck 4 fixed to the front part,
1, the head 4A of the tip chuck 4 penetrates the tip fastener 2 and protrudes from the tip. In addition, when the elastic piece 107B of the lead tank 107 is bent, the protrusion 107C of the lead tank 107 is moved to the sliding groove 101 of the base 101.
A, the core tank 107 is configured to be slidable in the longitudinal direction with respect to the base 101 but not to rotate,
Moreover, the core tank 107 is prevented from coming off the base 101. The inner stage 101D of the base 101 and the outer stage 1 of the inner cylinder 103
A front spring 10 is stretched between the front chuck 03G and the front chuck 03G, and the front spring 10 urges the distal end chuck 4 rearward in the longitudinal direction. Therefore, when the core 11 is inserted into the tip chuck 4, the head 4A of the tip chuck 4 is
To close the core 11 firmly. A shaft cylinder 112 is screwed into the rear portion of the base 101, and the knob 115 protrudes from the rear end of the shaft cylinder 112 as appropriate.

In the tip chuck type mechanical pencil according to the second embodiment, since the semi-cylindrical rear portion 108C of the locking piece 108 is fitted into the concave portion 103H of the inner cylinder 103, the locking piece 108 is not tilted. The advantage of being press-fitted and fixed to 103 is obtained. Furthermore, since the eraser 114 and the knob 115 are directly attached to the core tank 107, the number of parts is reduced, and the manufacturing can be performed at low cost. Furthermore, since the base 101 and the lead tank 107 are not rotatable, the lead tank 107 does not rotate even if a rotational force is applied to the knob 115 or the lead tank 107. Can be prevented from being broken by the rotation of the shaft.

[0009]

According to the above-described tip chuck type mechanical pencil of the present invention, the locking piece is press-fitted and fixed in the fixing hole formed in the peripheral wall of the inner cylinder, so that the inner cylinder can be formed to have a small diameter. Since the tube is not thickened, there is no danger of deteriorating the external appearance, and the effect that the tube can be configured to be easily gripped can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a mechanical pencil with a tip chuck according to the present invention.

FIG. 2 is an enlarged sectional view taken along line AA of FIG.

FIG. 3 is an enlarged sectional view taken along line BB of FIG. 1;

FIG. 4 is an enlarged sectional view taken along line CC of FIG. 1;

FIG. 5 is a plan view showing the base of the first embodiment.

FIG. 6 is a cross-sectional view showing a state in which a locking piece is press-fitted and fixed in a fixing hole of the inner cylinder in the first embodiment.

FIG. 7 is a sectional view showing a tip chuck type mechanical pencil according to a second embodiment of the present invention.

FIG. 8 is an enlarged sectional view showing a line AA in FIG. 7;

FIG. 9 is an enlarged sectional view taken along line BB of FIG. 7;

FIG. 10 is an enlarged sectional view showing a locking piece of a second embodiment.

FIG. 11 is an enlarged right side view showing a locking piece according to a second embodiment.

FIG. 12 is a sectional view showing a conventional tip chuck type mechanical pencil.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 3 Inner cylinder 3C Peripheral wall of inner cylinder 3 3D Fixing hole of inner cylinder 3 3E Inner hole inner surface of inner cylinder 3 3F Locking step of inner cylinder 3 4 Tip chuck 5 Feeding chuck 5A Head of feeding chuck 5 6 Fastener 8 Locking Piece 8A Foot of Locking Piece 8 11 Core 12 Shaft Cylinder 101 Cap 103 Inner Cylinder 103C Peripheral Wall of Inner Cylinder 103 103D Fixed Hole of Inner Cylinder 103 103E Inner Hole Inner Surface of Inner Cylinder 103 F Locking Inner Cylinder 103 Step 108 Locking piece 108A Foot of locking piece 108 112 Shaft barrel

Claims (1)

[Claims] 1. A barrel, a base provided at a front portion of the barrel, a tip chuck built in the base and urged rearward in the longitudinal direction to hold the lead, and a longitudinal direction from the tip chuck. A tip chuck type mechanical pencil, which is located rearward and includes a feed chuck for feeding out a lead by moving forward, has an inner cylinder fixed to the rear portion of the tip chuck and is engaged with a fixing hole formed in a peripheral wall of the inner cylinder. Pressing and fixing the stop piece,
A foot formed on the locking piece protrudes inward from the inner surface of the inner hole of the inner cylinder, and a fastener externally fitted to the head of the feeding chuck forms a locking step between the foot of the locking piece and the inner cylinder. Tip chuck type mechanical pencil characterized by being loosely fitted in between.