JPH0971092A - Mechanical pencil with chuck type tip end - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the assembly of an interior sleeve and enable shortened lead within the interior sleeve to be taken out securely by removably engaging a coupling piece to the interior sleeve fixed at the rear end part of a tip end chuck, and loosely holding a clamping piece outwardly fixed at the head part of a delivery chuck between the interior sleeve engaging step and the coupling piece. SOLUTION: A clamping piece 6 is outwardly fitted at the head part of a delivery chuck 5, and a lead case 7 is fixed at the rear at the rear part thereof. An inner spring 9 is spread over between a coupling piece 8 for receiving a clamping piece 6 and the lead case 7, and the head part of the delivery chuck 5 is pressed against the clamping piece 6. The coupling piece 8 is inserted from the rear part of an inner sleeve 3 so as to be removably engaged in a recess groove 3E of the inner sleeve 3. The clamping piece 6 is loosely held slidably between the engaging step 3F of the inner sleeve 3 and the coupling piece 8, and allowed to be pressed against the coupling piece 8 as usual. The inner sleeve 3 with the delivery chuck 5 and clamping piece 6 or the like built therein and the tip end chuck 4 fixed in the front part is inserted from the rear end of a metal piece 1 so that the head part of the tip end chuck 4 may piece through the tip end clamping piece 2 and project from the tip end thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knock type mechanical pencil for progressively feeding a lead, and a tip chuck for preventing the lead from retracting in a main body composed of a mouthpiece and a shaft cylinder, and a tightening ring fitted on the head so as to be fixed. TECHNICAL FIELD The present invention relates to a tip-end chuck type mechanical pencil provided with a feeding chuck that feeds out a lead in increments.

[0002]

2. Description of the Related Art Conventionally, as a knock type mechanical pencil capable of writing with a shortened lead, as shown in FIG. 9, an inner cylinder 403 is press-fitted and fixed to a tip chuck 104, and a fastener 6 is fitted on a delivery chuck. There are known a tip chuck type mechanical pencil in which 5 is incorporated in the inner cylinder 403, and a tip chuck mechanical pencil in which an inner cylinder 503 is screwed to the tip chuck 204 as shown in FIG.

[0003]

However, the tip chuck type mechanical pencil shown in FIG.
4 and the inner cylinder 403 could not be separated and could not be taken out when a short core was generated in the inner cylinder 403. Further, in the tip chuck type mechanical pencil shown in FIG. 10, the assembly of screwing the inner cylinder 503 into the tip chuck 204 is troublesome, and the inner shaft 117 is attached to the mouthpiece 101 to prevent the tip chuck 204 from coming off. When fixed, the tip chuck 204, the feeding chuck 5, the inner cylinder 503, etc. could not be removed from the die 101, and the short core generated in the inner cylinder 503 could not be taken out. An object of the present invention is to provide a tip chuck type mechanical pencil that solves the above problems.

[0004]

In order to achieve the above object, the present invention provides a barrel, a base provided at the front of the barrel,
It consists of a tip chuck that is built into the die and is biased rearward in the longitudinal direction to hold the core, and a delivery chuck that is located rearward in the longitudinal direction from the tip chuck and that delivers the core. The present invention relates to a tip-chuck type mechanical pencil in which a feeding chuck advances by advancing a more protruding pressing member to feed a lead. Moreover, the fastener which is detachably engaged with the inner cylinder fixed to the rear portion of the tip chuck, and which is externally fitted to the head of the feeding chuck,
A tip-chuck type mechanical pencil is configured by being loosely fitted between the locking stage of the inner cylinder and the connecting tool.

[0005]

Therefore, the connector can be easily engaged with the inner cylinder, and if a short core occurs in the inner cylinder, the connector can be removed to remove the short core.

[0006]

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 extending toward each other are formed so as to face each other, and the insertion grooves 1B are formed so that the sliding grooves 1A communicate with the rear end of the base 1 from the respective sliding grooves 1A. The insertion groove 1B is formed so that its width becomes wider toward the rear in the longitudinal direction. A metal tip fastener 2 is fixed to the tip opening 1C of the mouthpiece 1. Further, the rear portion of the inner cylinder 3 is halved by the kerfs 3A, and as shown in FIG. 5, the projections 3B are formed on the rear outer surfaces of the respective halves. The front surface in the longitudinal direction of the protrusion 3B is formed to be sharp. Further inner cylinder 3
A concave groove 3E is formed on the inner side by the inner step 3C and the inner protrusion 3D. The rear portion of the tip chuck 4 made of metal such as brass is fixed to the front portion of the inner cylinder 3. A fastener 6 is fitted onto the head of the feeding chuck 5, and a lead tank 7 is fixed to the rear portion of the feeding chuck 5. An inner spring 9 is stretched between the connecting tool 8 that receives the fastener 6 and the lead tank 7, and the head of the feeding chuck 5 is pressed against the fastener 6. The connector 8 is inserted from the rear of the inner cylinder 3 and is detachably engaged with the groove 3E of the inner cylinder 3. The fastener 6 is a locking step 3F of the inner cylinder 3 and a connecting tool 8.
A space is slidably fitted between them, and is normally pressed by the connector 8. An inner cylinder 3 having a feeding chuck 5, a fastener 6 and the like built therein and having a front end chuck 4 fixed thereto is inserted from the rear end of the mouthpiece 1, and the head of the front end chuck 4 inserts the front end fastener 2 therethrough. Project from the tip. Further, the projection 3B of the inner cylinder 3 is inserted into the sliding 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 edge 1D of the sliding groove 1A, and the inner cylinder 3 is prevented from slipping out of the base 1.
An outer spring 10 is stretched between the inner stage 1E of the mouthpiece 1 and the outer stage 3G of the inner cylinder 3, and the tip chuck 4 is biased rearward in the longitudinal direction by the outer spring 10. When the lead 11 is inserted into the tip chuck 4, the head 4A of the tip chuck 4 is pressed by the tip fastener 2 to be closed and firmly holds the lead 11. A shaft cylinder 12 is screwed into the rear part of the base 1, and an opening window 12A is formed in the rear part of the shaft cylinder 12. At the front part of the pressing member 13, two kerfs 13 extending in the longitudinal direction are formed.
An elastic piece 13B is formed by A, and a protrusion 13C is formed on the elastic piece 13B. The front part of the pressing member 13 is the barrel 1.
2 is inserted from the rear end, and the projection 13C of the pressing member 13 is fitted into the opening window 12A of the shaft cylinder 12. Core tank 7
The rear portion is inserted into the front inner hole 13D of the pressing member 13, and the lateral shake of the lead tank 7 is regulated. An eraser 14 is provided on the inside of the rear portion of the pressing member 13, and a knob 15 that covers the eraser 14 is fitted on the outside of the rear portion of the pressing member 13.

In the tip chuck type mechanical pencil of the first embodiment described above, the inner cylinder 3 is easily attached to the mouthpiece 1. Moreover, when the tip chuck 4 is biased rearward in the longitudinal direction by the outer spring 10 without holding the core 11, the rear end edge 1D of the sliding groove 1A of the mouthpiece 1 and the projection 3B of the inner cylinder 3 are engaged with each other. This prevents the inner cylinder 3 and the tip chuck 4 from coming off the base 1. Further, the connector 8 is easily attached to the concave groove 3E of the inner cylinder 3 with a proper fitting force, and when a short core occurs in the inner cylinder 3, simply pulling the core tank 7 rearward in the longitudinal direction. Connector 8
Can be removed.

FIG. 6 shows a second embodiment of the present invention. A rubber core holder 16 is attached to the inner cylinder 103 to which the tip chuck 4 is fixed, and the core 11 fed by the feeding chuck 5 is the core. It is held lightly by the holder 16.

Therefore, the feeding of the lead 11 by the feeding chuck 5 can be ensured, and the fed core 11 can be accurately guided to the tip chuck 4.

FIG. 7 shows a third embodiment of the present invention, in which the connecting member 108 is fitted to the inner surface of the inner cylinder 203 by an appropriate frictional force.

Therefore, the connector 108 can be easily attached to the inner cylinder 203, and when it is necessary to remove the connector 108, it is possible to easily remove it by simply pulling the lead tank 7 rearward in the longitudinal direction. is there.

FIG. 8 shows a fourth embodiment of the present invention, in which a projection 17A is formed on the rear outer surface of the inner shaft 17 at a position facing the projection, and the front surface in the longitudinal direction of the projection 17A is formed to be sharp. . After incorporating the tip chuck 4 and the inner cylinder 303 in the base 1, the protrusion 17A of the inner shaft 17 is inserted into the sliding groove 1A through the insertion groove 1B of the base 1, and the inner shaft 17 is attached to the base 1. .

Therefore, even when the tip chuck 4 does not hold the core 11 and is biased rearward in the longitudinal direction by the outer spring 10, the inner cylinder 303 contacts the inner shaft 17 and the inner cylinder 30
There is no risk that the tip 3 and the tip chuck 4 will fall out of the base 1.

[0014]

In the tip chuck type mechanical pencil of the present invention described above, the connecting tool is attached by engaging it with the inner cylinder, so that the connecting tool is easily and removably attached, and the short-circuit generated in the inner cylinder. The core can also be easily removed.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view taken along line BB of FIG.

FIG. 4 is a plan view showing a tip fastener and a mouthpiece according to the first embodiment.

FIG. 5 is a plan view showing an inner cylinder of the first embodiment.

FIG. 6 is a cross-sectional view of main parts showing a second embodiment of the present invention.

FIG. 7 is a cross-sectional view of main parts showing a third embodiment of the present invention.

FIG. 8 is a cross-sectional view of main parts showing a fourth embodiment of the present invention.

FIG. 9 is a cross-sectional view of main parts showing a conventional tip chuck type mechanical pencil in which an inner cylinder is press-fitted and fixed to a tip chuck.

FIG. 10 is a cross-sectional view of main parts showing a conventional tip chuck type mechanical pencil in which an inner cylinder is screwed into a tip chuck.

[Explanation of symbols]

 1 Mouth 1A Sliding Groove of Mouth 1 1B Insertion Groove of Mouth 1 3 Inner Cylinder 3B Protrusion of Inner Cylinder 3F 3 Inner Cylinder 3 Locking Step 4 Tip Chuck 5 Feeding Chuck 6 Fastener 8 Connector 11 Core 12 Shaft Cylinder 13 Pressing member 103 Inner cylinder 108 Connecting tool 203 Inner cylinder 303 Inner cylinder

Claims (2)

[Claims] 1. A shaft cylinder, a cap provided at a front portion of the shaft cylinder, a tip chuck that is built in the cap and holds the core by being urged rearward in the longitudinal direction, and a longitudinal direction from the tip chuck. A tip chuck type mechanical pencil, which is located at the rear and consists of a delivery chuck for delivering the lead, advances the pressing member protruding from the rear end of the barrel to advance the delivery chuck to deliver the lead. Removably engage the connector to the inner cylinder fixed to the rear,
A tip-end chuck type mechanical pencil characterized in that a fastener externally fitted to the head of the feeding chuck is loosely fitted between a locking step of an inner cylinder and the connecting tool. 2. A slide groove extending in the longitudinal direction is formed at the rear portion of the base, and an insertion groove is formed so as to communicate with the rear end of the base from the slide groove, and a projection formed on the inner cylinder is formed on the base of the base. The tip chuck type mechanical pencil according to claim 1, wherein the mechanical pencil is engaged with the sliding groove through the insertion groove.