JPH11221995A - Tip chuck type mechanical pencil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tip chuck type mechanical pencil to be manufactured at low cost in a simple manufacturing process in which structures such as a refill tank and a tip chuck are not feared to be damaged at the time of assembly. SOLUTION: A tip chuck type mechanical pencil is constituted of a barrel 1, a tip chuck 6 built in the barrel 1 and energized backward in the longitudinal direction to hold a refill 3, a delivery chuck 7 positioned at the rear in the longitudinal direction of the tip chuck 6 and moved forward to deliver the refill 3 and a refill tank 9 connected with the rear section of the delivery chuck 7, and the refill tank 9 is so built in the barrel 1 as to slide in the longitudinal direction and an inner barrel 5 is fixed on the rear of the tip chuck 6. A front spring 14 is stretched in tension between an inner step 1D of the barrel 1 and the inner barrel 2 to energize the tip chuck 6 backward in the longitudinal direction, and a head section 6a of the tip chuck 6 is pressed on the tip part of the barrel 1 to close the tip chuck 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanical pencil having a tip chuck for holding a lead, and a tip chuck provided with a feed chuck for fitting a fastener 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, as shown in FIG. 16, an inner cylinder 305 is press-fitted and fixed to a tip chuck 6, and is engaged in the inner cylinder 305. The stop piece 312, the feeding chuck 107, the fastener 108 and the like are built in. The inner cylinder 305 is built in the base 18, the shaft cylinder 601 is connected to the base 18, and the head 6 A of the tip chuck 6 urged rearward in the longitudinal direction is fastened to the tip opening provided at the tip opening of the base 18. Tool 2
To hold the lead 3 closed, and a lead tank 409 connected to the rear part of the feed chuck 107 is built in the shaft cylinder 601 so as to be slidable in the longitudinal direction, thereby forming a tip-tip mechanical pencil. Was.

[0003]

However, the tip chuck type mechanical pencil shown in FIG. 16 first incorporates the tip chuck 6, the inner cylinder 305, the locking piece 312, the feeding chuck 107, the core tank 409 and the like into the base 18. And then
The base 18 must be connected to the barrel 601.
When the shaft 8 and the shaft cylinder 601 are connected to each other, members such as the core tank 409 and the tip chuck 6 may be damaged by contact with the assembly machine. In addition, a complicated production process is required for connecting the base 18 and the barrel 601, which causes an increase in cost. 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]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a shaft cylinder, a tip chuck incorporated in the shaft cylinder and urged rearward in the longitudinal direction to hold the core, In the tip chuck type mechanical pencil, which is located at the back of the chuck in the longitudinal direction and is provided with a feed chuck for feeding the lead by advancing and a lead tank connected to the rear of the feed chuck, the lead tank is longitudinally inserted into the shaft cylinder. The inner chuck is fixed to the rear part of the tip chuck, and the front spring is stretched between the inner stage of the shaft cylinder and the inner cylinder. A tip chuck type mechanical pencil is configured to press the head of the tip chuck against the tip of the barrel or a tip fastener provided at the tip of the barrel to close the tip chuck.

[0005]

FIG. 1, FIG. 2, FIG. 3 and FIG. 4 show a first embodiment of the present invention, in which a recess 1A is formed on the outer periphery of the front part of a synthetic resin barrel 1 and the recess 1A is formed. A sliding groove 1B extending in the longitudinal direction is formed on the peripheral wall of the peripheral wall so as to face each other up and down. A metal tip fastener 2 is fixed to the tip opening 1C of the barrel 1. A fixing hole 5A is formed on the peripheral wall of the inner cylinder 5 having a built-in core holder 4 for holding the core 3 lightly in the front part, and the fixing hole 5A is formed in the front part of the inner cylinder 5 and made of metal such as brass. The rear part of the tip chuck 6 is fixed. A fastener 8 is externally fitted to the head of the feeding chuck 7, and a core tank 9 is fixed to a rear portion of the feeding chuck 7. An outer step 9A composed of an outer flange is formed at the front of the core tank 9, and an elastic piece 9C is formed at the rear thereof by a U-shaped cutout groove 9B as shown in FIG. A protrusion 9D is formed on each of 9C.

Further, an eraser 10 is provided on the rear inner side 9E of the core tank 9, and a knob 11 for covering the eraser 10 is fitted on the rear outer side 9F of the core tank 9. As shown in FIG. 2, a locking piece 12 is press-fitted and fixed in the fixing hole 5A of the inner cylinder 5, and the foot 12A of the locking piece 12 is
B is configured to protrude inward from B. A rear spring 13 is stretched between the rear end of the inner cylinder 5 and the outer step 9A of the core tank 9, and the head of the feeding chuck 7 is pressed by the fastener 8. The fastener 8 is loosely and slidably fitted between the locking step 5C of the inner cylinder 5 and the locking piece 12, and is normally pressed by the locking piece 12.

[0007] An inner cylinder 5 having a built-in feeding chuck 7, a fastener 8 and the like and having a front end chuck 6 fixed to a front portion is inserted from the rear end of the shaft cylinder 1, and a head 6A of the front end chuck 6 is fixed to the front end clamping. The tool 2 is inserted and protrudes from the tip. Also, the core tank 9
When the elastic piece 9C of the core tank 9 bends, the protrusion 9
D is fitted into the sliding groove 1B of the barrel 1 and the lead tank 9 is slidable in the longitudinal direction in the barrel 1 but cannot be rotated. Prevent it from coming off more.

A front spring 14 is stretched between an inner stage 1D of the shaft cylinder 1 and an outer stage 5D of the inner cylinder 5, and the front spring 1
4, the tip chuck 6 is urged rearward in the longitudinal direction. Therefore, when the core 3 is inserted into the tip chuck 6, the head 6A of the tip chuck 6 is pressed and closed by the tip fastener 2, and the core 3 is firmly held. The knob 11
Is configured to protrude from the rear end of the barrel 1 as appropriate,
A clip 15 is integrally formed on the rear outer wall of the barrel 1.

Further, a soft elastic body 1 is provided in the concave portion 1A of the barrel 1.
6 is externally fitted to cover the sliding groove 1B of the shaft cylinder 1 with the soft elastic body 16 and prevent the finger from slipping when gripped.

FIG. 5 shows a second embodiment of the present invention. The same members as those in FIG. 1 are denoted by the same reference numerals and description thereof is omitted. The inner cylinder 105 is fixed to the rear part of the tip chuck 6, and the locking piece 112 is provided at the rear part of the inner cylinder 105 by press fitting or the like. The locking step 105C of the inner cylinder 105 and the locking piece 112
The fastener 8 is loosely fitted to the front end of the feeding chuck 7, and the fastener 8 is externally fitted to the head of the feeding chuck 7. A lead tank 9 is fixedly attached to the rear portion of the feeding chuck 7.
The rear spring 13 is stretched between the outer steps 9A, and the head of the feeding chuck 7 is pressed by the fastener 8. The front spring 14 is provided between the inner stage 1D of the shaft cylinder 1 and the outer stage 1D of the inner cylinder 105.
05D, and the front chuck 14 urges the tip chuck 6 rearward in the longitudinal direction.

FIGS. 6 and 7 show a third embodiment of the present invention. The same members as those in the above embodiment are denoted by the same reference numerals and description thereof will be omitted. A metal tip fastener 2 is fixed to the tip opening 101C of the synthetic resin barrel 101.
A locking piece 212 is provided at the rear of the inner cylinder 105, and a sliding groove 212B extending longitudinally forward from the rear end is formed at the rear of the locking piece 212 so as to face up and down. A fastener 8 is loosely fitted between the locking step 105C of the inner cylinder 105 and the front end of the locking piece 212, and the fastener 8 is fitted on the head of the feeding chuck 7 outside. A lead tank 109 is fixed to the rear part of the feeding chuck 7, and a protrusion 10 is formed on the outer periphery of the front part of the lead tank 109.
9D is formed. The projection 109D is connected to the locking piece 212.
The core tank 109 is slidable in the longitudinal direction with respect to the locking piece 212 but is not rotatable. Furthermore, the inner step 212C of the locking piece 212
A rear spring 113 is provided between the
Is stretched, and the head of the feeding chuck 7 is pressed by the fastener 8.

The inner cylinder 105, the locking piece 212, the feeding chuck 7, the fastener 8, the rear spring 113, and the core tank 109
The mechanical part composed of the above is inserted from the rear end of the barrel 101, and the rear part of the tip chuck 106 inserted from the front end of the barrel 101 is press-fitted and fixed to the inner cylinder 105. Moreover, the shaft cylinder 101
The front spring 14 is stretched between the inner stage 101D and the outer stage 105D of the inner cylinder 105, and the head 106A of the tip chuck 106 is pressed and closed by the tip fastener 2 to hold the core 3 firmly. .

Further, even when the tip chuck 106 does not hold the core 3, the outer flange portion 106B formed on the head portion 106A of the tip chuck 106 abuts on the tip fastener 2.
There is no risk that the tip chuck 106 will fall back inside the tip fastener 2.

FIG. 8 shows a fourth embodiment of the present invention. The same members as those in the above embodiment are denoted by the same reference numerals and the description thereof will be omitted. A sliding groove 205E extending forward in the longitudinal direction from the rear end is formed in the rear part of the inner cylinder 205 so as to face vertically, and a locking piece 312 is provided in the inner cylinder 205. A fastener 8 is loosely fitted between the locking step 205C of the inner cylinder 205 and the front end of the locking piece 312, and the fastener 8 is externally fitted to the head of the feeding chuck 7. A lead tank 109 is fixed to the rear part of the feeding chuck 7, and protrusions 109 </ b> D are formed vertically on the outer periphery of the front part of the lead tank 109. The protrusion 109D is inserted into the sliding groove 205E of the inner cylinder 205,
Is configured to be slidable in the longitudinal direction with respect to the inner cylinder 205 but not to rotate. Furthermore, the inner stage 3 of the locking piece 312
A rear spring 113 is stretched between 12C and the front end of the core tank 109, and the head of the feeding chuck 7 is pressed by the fastener 8.

FIGS. 9 and 10 show a fifth embodiment of the present invention. The same members as those in the above embodiment are denoted by the same reference numerals and description thereof will be omitted. A metal tip fastener 2 is fixed to the tip opening 201C of the synthetic resin barrel 201,
A sliding groove 201 </ b> E is formed on the inner surface of the rear part of the shaft cylinder 201 so as to extend longitudinally forward from the rear end. At the rear of the inner cylinder 105, a locking piece 112 is provided.
The fastener 8 is loosely fitted between C and the front end of the locking piece 112. The fastener 8 is fitted on the head of the feeding chuck 7.
A lead tank 209 is fixed to the rear part of the feeding chuck 7,
A projection 209 </ b> D is formed at the rear large diameter portion of the core tank 209. Further, a rear spring 113 is stretched between the inner stage of the locking piece 112 and the front end of the core tank 209, and the head of the feeding chuck 7 is pressed by the fastener 8.

The inner cylinder 105, the locking piece 112, the feeding chuck 7, the fastener 8, the rear spring 113, and the core tank 209
The mechanical part composed of the above is inserted from the rear end of the shaft cylinder 201, and the rear part of the tip chuck 106 inserted from the front end of the shaft cylinder 201 is press-fitted and fixed to the inner cylinder 105. Moreover, the shaft cylinder 201
The front spring 14 is stretched between the inner stage 201D and the outer stage 105D of the inner cylinder 105, and the head 106A of the tip chuck 106 is pressed and closed by the tip fastener 2 to firmly hold the core 3. . The core tank 209 is slidably built in the barrel 201, but the sliding groove 201 of the barrel 201 is
E, the protrusion 209D is inserted into the core tank 2
09 is not rotatable.

FIGS. 11 and 12 show a sixth embodiment of the present invention. The same members as those in the above embodiment are denoted by the same reference numerals and description thereof will be omitted. A metal tip fastener 2 is fixed to the tip opening 301C of the synthetic resin barrel 301, and a clip 115 is integrally formed on the rear outer wall of the barrel 301. In the rear outer wall of the barrel 301, a sliding groove 301E is formed at a position below the clip 115 and extends longitudinally forward from the rear end. Further, an opening window 301F located below the clip 115 and communicating with the sliding groove 301E is formed on the rear outer wall of the shaft cylinder 301.

A core tank 309 made of a synthetic resin pipe material is fixed to the rear portion of the feeding chuck 7.
A rear spring 113 is stretched between the inner stage 2 and the front end of the core tank 309, and the head of the feeding chuck 7 is fixed to the fastener 8.
Is pressed.

Further, an eraser support 17 is press-fitted and fixed to the rear portion of the core tank 309, and an elastic piece 17C is provided on the upper side of the outer peripheral portion of the eraser support 17 so as to bridge the front support portion 17A and the rear support portion 17B. A projection 17D is formed at an intermediate portion of the elastic piece 17C.

Tip chuck 6, inner cylinder 105, locking piece 11
2. A mechanism portion including the feeding chuck 7, the fastener 8, the rear spring 113, the core tank 309, the eraser support 17, and the like is inserted from the rear end of the shaft cylinder 301, and the head 6 of the tip chuck 6
A penetrates the tip fastener 2 and projects from the tip.

The elastic piece 17C of the eraser support 17 is slidably inserted in the sliding groove 301E of the shaft cylinder 301 in the longitudinal direction, and the elastic piece 17C bends, so that the projection 17D of the eraser support 17 is bent. The eraser support 17 is slidably fitted in the opening window 301F of the barrel 301 in the longitudinal direction, and is slidably fitted in the barrel 301 in the longitudinal direction but cannot rotate.

In the case of the sixth embodiment, since the opening window 301F of the barrel 301 and the projection 17D of the eraser support 17 are hidden by the clip 115, there is no danger of impairing the appearance.

FIGS. 13 and 14 show a seventh embodiment of the present invention. The same members as those of the above embodiment are denoted by the same reference numerals and description thereof will be omitted. The metal tip fastener 2 is fixed to the tip opening 401C of the synthetic resin barrel 401. A sliding groove 401B extending in the longitudinal direction and a guide groove 401 which communicates with the rear end of the sliding groove 401B and becomes wider toward the rear in the longitudinal direction are formed on the rear outer wall of the shaft cylinder 401.
G is formed.

An eraser support 117 is press-fitted and fixed to the rear of the core tank 309 made of a synthetic resin pipe material, and a clip 2 is mounted on the outer peripheral upper side of the eraser support 117.
15 are integrally formed.

Tip chuck 6, inner cylinder 105, locking piece 11
2. A mechanical portion including the feeding chuck 7, the fastener 8, the rear spring 113, the core tank 309, the eraser support 117, and the like is inserted from the rear end of the shaft cylinder 401, and the head 6A of the tip chuck 6 is attached to the tip fastener 2 And project from the tip.

The fixing portion 215A of the clip 215 provided on the eraser support 117 is guided from the guide groove 401G of the shaft cylinder 401 and inserted into the slide groove 401B. Is built in so that it can slide but cannot rotate.

In the case of the seventh embodiment, since the rotation and removal of the eraser support 117 are prevented by the clip 215, there is no need to form elastic pieces or protrusions on the eraser support 117, and the shaft cylinder 401 is not required. Clip 21
Since there is no need to form the structure 5, the structure is simplified, and the advantages of easily assembling and removing the mechanical section can be obtained.

FIG. 15 shows an eighth embodiment of the present invention, in which the same members as those of the above embodiment are denoted by the same reference numerals and description thereof will be omitted. In the eighth embodiment, the head 6A of the tip chuck 6 is pressed directly against the tip opening 501C of the barrel 501, and the core 3 is firmly held by the tip chuck 6.

The present invention is not limited to only the above-described embodiment, and the components such as the inner cylinder, the locking piece, the core tank, and the eraser support may be integrated by fixing two or more components, It is of course possible to attach a clip to the cylinder.

[0030]

The tip chuck type mechanical pencil of the present invention described above is produced simply by incorporating mechanical parts such as a tip chuck, an inner cylinder, a locking piece, an extension chuck, and a lead tank in a shaft cylinder. The process is simple and can be produced at low cost, and there is an effect that there is no possibility that the mechanical parts such as the core tank and the tip chuck are damaged during assembly.

[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 plan view of a main part showing the lead tank of the first embodiment.

FIG. 5 is a sectional view showing a tip chuck type mechanical pencil according to a second embodiment of the present invention.

FIG. 6 is a sectional view showing a tip chuck type mechanical pencil according to a third embodiment of the present invention.

FIG. 7 is an enlarged sectional view showing a line AA in FIG. 6;

FIG. 8 is a sectional view showing a tip chuck type mechanical pencil according to a fourth embodiment of the present invention.

FIG. 9 is a sectional view showing a tip chuck type mechanical pencil according to a fifth embodiment of the present invention.

FIG. 10 is an enlarged sectional view taken along line AA of FIG. 9;

FIG. 11 is a sectional view showing a tip chuck type mechanical pencil according to a sixth embodiment of the present invention.

FIG. 12 is an enlarged sectional view taken along line AA of FIG. 11;

FIG. 13 is a sectional view showing a tip chuck type mechanical pencil according to a seventh embodiment of the present invention.

FIG. 14 is a plan view of a main part showing a barrel and a clip of a seventh embodiment.

FIG. 15 is a sectional view of a main part showing an eighth embodiment of a tip chuck mechanical pencil according to the present invention.

FIG. 16 is a sectional view showing a conventional tip chuck mechanical pencil.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft tube 1D Inner stage of shaft tube 1 2 Tip tightener 3 Core 5 Inner tube 5C Locking stage of inner tube 5 6 Tip chuck 6A Head of tip chuck 6 7 Feeding chuck 8 Fastener 9 Core tank 12 Locking piece 13 Rear spring 14 Front spring 101 Shaft tube 101D Inner stage 105 of barrel tube 101 Inner tube 105C Engagement stage of inner tube 105 106 Tip chuck 106A Head of tip chuck 106 107 Feeding chuck 108 Fastener 109 Core tank 112 Locking piece 113 Rear spring 201 Shaft tube 201D Inner stage of shaft tube 201 205 Inner tube 205C Locking stage of inner tube 205 209 core tank 212 Lock piece 301 Shaft tube 309 Core tank 312 Lock piece 401 Shaft tube 501 Shaft tube

Claims (4)

[Claims] 1. A shaft cylinder, a tip chuck incorporated in the shaft cylinder and urged rearward in the longitudinal direction to hold the core, and located at a position rearward of the tip chuck in the longitudinal direction and advanced to advance the core. In the tip chuck type mechanical pencil, which consists of a feed chuck for feeding and a lead tank connected to the rear part of the feed chuck, the lead tank is built in the shaft cylinder so as to be slidable in the longitudinal direction, and the tip tank is located at the rear of the tip chuck. An inner cylinder is fixed, and a front spring is stretched between the inner stage of the shaft cylinder and the inner cylinder to urge the tip chuck rearward in the longitudinal direction, and the head of the tip chuck is positioned at the tip of the barrel. A tip chuck type mechanical pencil characterized by pressing to close the tip chuck. 2. A shaft cylinder, a tip chuck incorporated in the shaft cylinder and urged rearward in the longitudinal direction to hold the core, and located at a position rearward of the tip chuck in the longitudinal direction and advanced to advance the core. In the tip chuck type mechanical pencil, which consists of a feed chuck for feeding and a lead tank connected to the rear part of the feed chuck, the lead tank is built in the shaft cylinder so as to be slidable in the longitudinal direction, and the tip tank is located at the rear of the tip chuck. An inner cylinder is fixed, and a front spring is stretched between the inner stage of the shaft cylinder and the inner cylinder to urge the tip chuck rearward in the longitudinal direction, and the head of the tip chuck is positioned at the tip of the barrel. A tip chuck type mechanical pencil, wherein the tip chuck is closed by pressing the tip fastener provided. 3. A locking piece is attached to the inner cylinder, a fastener is loosely fitted between the locking step of the inner cylinder and the locking piece, and the fastener is externally fitted to the head of the feeding chuck. 3. The mechanical pencil according to claim 1, wherein a rear spring is stretched between the bridge and the core tank. 4. A locking piece is attached to the inner cylinder, a fastener is loosely fitted between the locking step of the inner cylinder and the locking piece, and the fastener is externally fitted to the head of the feeding chuck. 3. A mechanical pencil according to claim 1, wherein a rear spring is stretched between the lead tank and the lead tank.