JP3089439B2 - Stretchable knock mechanical pencil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knock mechanical pencil having a freely expandable shaft.

[0002]

2. Description of the Related Art A conventional writing instrument of this type has a fixed length in the axial direction, which is convenient for writing. Therefore, when the writing instrument is pushed into a breast pocket when not in use, the bottom of the pocket may be damaged. The pocket may be stained by a lead core or the like protruding from the tip. In order to avoid this, a writing instrument with a freely extendable shaft length has been proposed to make it easy to carry around.However, in the case of a mechanical pencil in which a lead core is pulled out by knocking, a lead holder The lead core inside may be broken or the chuck part may be pulled, so that the lead core may be strongly tightened and bitten, and the fine lead core may be scattered inside the shaft, causing a failure.

[0003]

SUMMARY OF THE INVENTION The present invention has no such drawbacks, has a stable lead core feeding operation, and is capable of breaking the lead core and pulling the chuck portion by extending and retracting the writing shaft.
An object of the present invention is to provide a retractable knock mechanical pencil that does not cause biting of a lead core due to the above, and that can easily clean the inside.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the gist of the present invention is as follows. (1) incorporates a chuck mechanism 17, and through a joint 7 to the grip shaft 1 having an advance payment 14 to the tip wearing
The detachably connected intermediate barrel 2 is inserted into the upper barrel 3 so as to be able to move in the longitudinal direction and to be rotatable about a fixed section axis. Further, from the rear end side of the upper barrel 3 , Long under elasticity
Knock cylinder 1 with reciprocally movable knock section in axial direction
0, the one end of the core holder 9 is set as the long axis
And the other end of the core holder 9
Slidably in the longitudinal direction through the end of the intermediate barrel 2
Penetrates the center of the part 7 and is connected to the rear end of the chuck 17
It was made so as to face in a non-connected state to the joint portion 8, the upper shaft tube 3 at the time of extension of the writing shaft by mutually transition to opposite axial direction of the grip shaft 1 or the intermediate shaft tube 2 and the upper shaft tube 3 engage and the knock sleeve 10 and the wick holder 9 by a predetermined angle rotation in a clockwise direction about the axis, the transition of the two cross the axial direction is prevented, the upper shaft tube 3 and the other the transition blocking Knock cylinder 10 and lead holder after having been released by rotating a predetermined angle around the axis in the opposite direction to the above.
The time of reduction of the writing shaft by opposing changes in the 9, the knock sleeve 1
0 is configured to abut against a spring receiver 13 fitted and fixed to the lead holder 9 , and in any case, the knocking operation of the knock cylinder 10 causes the lead holder 9 to move the lead holder 9 facing the lead holder 9.
Forward in the direction of contact with the joint 8 of the locking mechanism.
The retractable knock mechanical pencil is characterized in that the chuck mechanism is operated and the lead core is fed out.

[0005] (2) The transition of the knock cylinder 10 and the core holder 9 in the long axis direction is prevented by the fact that the projection 104 at the distal end of the knock cylinder 10 is formed in the long axis direction formed on the peripheral surface of the core holder 9 . 2. The retractable knock mechanical pencil according to the above item 1, wherein the engagement is performed by engaging a partial annular groove 91 formed by bending in the circumferential direction continuously with the guide groove 94 .

Hereinafter, the structure and operation of a knock mechanical pencil according to the present invention will be described with reference to the embodiments shown in the drawings. FIG. 1 is an overall vertical cross-sectional view of a knock type mechanical pencil of the present invention when a writing shaft is extended, and FIG. 2 is an overall side view showing a partially cut-away vertical cross-section when the writing shaft is also reduced. In FIG. 1, 1 is a grip shaft, 2 is an intermediate barrel, 3 is an upper barrel, 14 is a tip screwed to a reduced diameter portion of the tip of the grip shaft 1, and 15 is attached to the tip of the tip. Reference numeral 16 denotes a core breaker.

[0007] A chuck mechanism including a chuck 17 and a clutch 18 is built in the bore of the grip shaft portion 1 over the reduced diameter portion, and a joint portion 8 is fixed to the rear end of the chuck 17. A chuck spring 19 is mounted between the joint 8 and the step of the bore of the grip shaft 1. The grip shaft portion 1 is detachably connected to the intermediate barrel 2 via a joint 7 in a detachable threaded state. The rear end of the intermediate barrel 2 is connected to the inner cavity of the upper barrel 3 by a long shaft. It is fitted so that it can move freely in the direction.

[0010] The knock cylinder 10 is provided with a knock spring 2 in a rear end bore portion of the upper barrel 3 through a knock cylinder guide 11.
A fixed knock section is mounted to be able to reciprocate in the longitudinal direction in a fixed knock section against the elastic force of 1 and an eraser 24 held by an eraser band 23 is inserted into the rear end cavity of the knock cylinder 10. A knock cap 5 is mounted on the rear end of the knock cylinder 10 so as to cover this. 6 is an upper barrel 3 for fixing the knock barrel guide 11 shown in a perspective view in FIG.
A screw ring 26 is screwed into the rear end bore portion. Reference numeral 26 denotes an annular groove 1 for a knock cylinder guide stop ring provided in the knock cylinder 10.
The knock cylinder guide stopper ring 4 fitted to 02 is a clip fixed to the upper barrel 3.

The knock cylinder guide 11 shown in FIG. 7 has a notch 111 formed at the top for attaching the base of the clip 4 to the upper end of the upper barrel 3. The front end cavity of the knock cylinder guide 11 is formed. Are provided with a pair of diametrically opposed bore guides 113. The manner of attaching the clip 4 is as shown in FIG. 3 (g), and reference numeral 22 denotes a clip which is fitted in a gap between the bent portion 41 of the clip base and the upper barrel 3.
As shown in FIG. 3 (f), the knock tube 10 and the knock tube guide 11 are connected to the long axial guide groove 1 provided in the knock tube 10.
03 is mounted so that the inner tube guide projection 113 of the knock tube guide 11 is engaged with the knock tube guide so that the knock tube can be freely moved in the longitudinal direction.

The rear end of the core holder 9 is fitted into the bore of the knock cylinder 10 so as to be able to move in the longitudinal direction, and the upper barrel 3 is turned in one direction around the axis when extended as shown in FIG. By rotating by a predetermined angle (clockwise), transition in the long axis direction is prevented in a manner described later. The front end of the wick holder 9 has the center of the joint 7 in the longitudinal direction and
It slidably penetrates the knock section regulated by the knock cylinder guide 11 and faces the rear end cavity bottom surface of the joint portion 8 at a slight interval in a non-connected state . This state
In, by knocking the knock cap 5, the operation is transmitted to the wick holder 9 through the knock sleeve 10, its
As a result, the front end of the core holder is pushed toward the joint 8.
Then, the chuck mechanism operates and the lead core is fed out. Reference numeral 20 denotes a spring receiving annular groove 92 formed in the core holder 9.
The intermediate spring 12 mounted between the spring receiver 13 fitted to the rear end and the stepped portion of the rear end bore portion of the joint portion 7 is fitted in the retaining ring annular groove 93 of the core holder 9, This is a retaining ring that comes into contact with the front end of the joint portion 7 against the elastic force of the spring 20.

FIG. 2 shows a state in which the transition of the core holder 9 and the knock cylinder 10 in the longitudinal direction is prevented, as will be described later.
This shows the writing shaft contracted state that has been shifted until the tip of the knock cylinder 10 comes into contact with the spring receiver 13.
The knocking operation of “0” is performed by the intermediate spring through the spring receiver 13.
Is transmitted to the wick holder 9 against the elastic force of the ring 20 , so that the front end of the wick holder 9 faces the joint 8.
The transition contact is made, whereby the chuck mechanism is operated, and the lead core is fed out.

FIG. 3 is a cross-sectional view of each part of FIG. 1 as viewed in the direction of an arrow, wherein (a) is a cross-sectional view as viewed from an arrow A, (b) is a cross-sectional view as viewed from an arrow B,
(C) is a sectional view as viewed in the direction of the arrow C, (d) is a sectional view as viewed in the direction of the arrow D, and (e).
Is a cross-sectional view as viewed from an arrow E, (f) is a cross-sectional view as viewed from an arrow F, and (g) is a cross-sectional view as viewed from an arrow G. From these figures, it can be seen that the grip shaft portion 1, the intermediate shaft tube 2, the upper shaft tube 3, the clip 4, the joint portion 7, the core holder 9, the knock tube 10, the knock tube guide 11, the retaining ring 12, the spring receiver 13, and the clip stopper. The relative positions of the 22, the lead core 25, and the knock cylinder guide stop ring 26 will be clear.

FIG. 4 is a detailed structural view of the knock cylinder 10. 4A is a half sectional side view showing the entirety of the knock cylinder 10, FIG. 4B is a sectional view taken along the arrow B in FIG.
FIG. 3C is a cross-sectional view taken along the arrow C in FIG. 4A, and FIG. 4D is a cross-sectional view taken along the arrow D in FIG. FIG.
In the figure, 101 is an annular convex portion, 102 is an annular groove for mounting the knock cylinder guide stop ring 26, 103 is a longitudinal guide groove extending in the longitudinal direction of the knock cylinder 10, and has a bore of the knock cylinder guide 11 therein. The part guide projections 113 are engaged and guided. Numeral 104 denotes a distal bore projection, which is guided by engaging with a long axial guide groove 94 described later with reference to FIG.

FIG. 5 is a detailed structural view of the lead holder 9. FIG. 5A is a half sectional side view showing the entire core holder 9, and FIG. 5B is a sectional view taken along the arrow B in FIG.
FIG. 3C is a cross-sectional view as viewed in the direction of the arrow C in FIG. 4A, FIG. 4D is a cross-sectional view as viewed in the direction of the arrow D in FIG.
FIG. 3 is a cross-sectional view taken along the arrow E in FIG.

In FIG. 5, reference numeral 91 denotes the tip of the knock barrel 10 by rotating the upper barrel 3 in one direction (clockwise) around the axis when the writing shaft shown in FIG. The lumen projection 104 engages as described later with reference to FIG. 6, and a partial annular groove formed on the peripheral surface of the core holder 9 so that the transition of the knock cylinder in the long axis direction is locked. FIG. 5 (e)), 92 is an annular groove (see FIG. 3 (c)) into which the spring receiver 13 for receiving the intermediate spring 20 shown in FIG. 1 is fitted, and 93 is a joint portion 7 as shown in FIG. An annular groove (see FIG. 3A) into which the retaining ring 12 abutting under the elastic force of the intermediate spring 20 is fitted to the front end surface of the knocking cylinder 10. And a long-axis direction guide groove for guiding the transition of the knock cylinder 10 in the long-axis direction. In addition, the partial annular groove 91 is provided at the end position of the longitudinal guide groove 94 in the guide groove 9.
4 and is formed to be bent clockwise at right angles over the circumferential direction of the core holder 9.

FIG. 6A shows a core holder 9 and a knock cylinder 10.
FIG. 3B is a cross-sectional view (see FIG. 3D) of FIG. 3A at the time of extension when the lead holder 9 is extended and contracted. FIG. 3C shows a state in which the transition in the longitudinal direction with respect to the cylinder 10 is free. In FIG. 4C, the knock cylinder 10 is rotated in the direction of arrow A from the state shown in FIG. Shows a state that is fixed to prevent transition inhibition.

The operation method of the knock mechanical pencil of the present invention will be described. In the extended state shown in FIG. 1, the transition of the intermediate barrel 2 and the upper barrel 3 in the longitudinal direction is prevented,
When the knock cap 5 of the knock cylinder 10 is pressed, the lead core 25 is pressed.
The following operation is performed so that the payout is performed. First, pull the left and right grip shaft 1 or the intermediate shaft tube 2 and the upper shaft tube 3 in the longitudinal direction, resulting in the position shown in FIG. 1 and the knock sleeve 10 and the wick holder 9. At this time, a pair of diametrically opposed distal bore projections 104 of the knock cylinder 10 are guided by a pair of diametrically opposed longitudinal guide grooves 94 formed on the surface of the core holder 9, and in the most extended state. It is brought into contact with the end wall of the longitudinal guide groove 94.
At the position of the end point wall, as shown in FIG. 5E, following the guide groove 94, in the circumferential direction, that is, in a hook shape,
A partial annular groove 91 is formed. Therefore, the upper barrel 3
Is rotated clockwise by a certain angle around the axis, that is,
As shown in FIG. 6B, the knock cylinder 10 is rotated in the direction of arrow A to bring it into the state shown in FIG. The transition in the long axis direction of the core holder 9 with respect to the core holder 9 is prevented by the distal end lumen projection 104 abutting against the side wall 95 of the partial annular groove 91.

Thus, by giving a knocking operation to the knock cap 5, this is transmitted to the core holder 9 through the knock cylinder 10, and as a result, the concentric holder is pushed in the axial direction.
And the front end of the
The mechanism is operated , and the lead core 25 is fed out from the end pipe 15. Next, the following operation is performed to change the state shown in FIG. 1 to the reduced state shown in FIG. The upper barrel 3 is rotated around the axis by a constant angle in the counterclockwise direction, ie, as shown in FIG.
As shown in (c), the knock cylinder 10 is rotated in the direction of arrow B to bring it into the state shown in (b) of FIG. If the protrusion 104 is brought to the position of the longitudinal guide groove 94, the knock cylinder 10
And the core holder 9 can be freely moved in the long axis direction, so that when one of the intermediate barrel 2 and the upper barrel 3 is pressed in the long axis direction, the reduced state shown in FIGS. be able to. In this case, the tip of the knock cylinder 10 comes into contact with the spring receiver 13 fitted to the core holder 9. If a knocking operation is given to the knock cap 5, this is transmitted to the core holder 9 , and the concentric holder is operated by the chuck mechanism. No
To make a chuck mechanism
Then, the lead core 25 is fed out from the end pipe 15.

[0019]

According to the present invention, a telescopic knock type shear according to the present invention is provided.
The most distinctive feature of Pupils is the chuck mechanism.
Without connecting directly to the core holder
In this configuration, the core can be extended
Operation is stable, and breakage of the core and
The lead core is strongly tightened because the
There is no occurrence of the condition of being broken,
The grip shaft 1 with the built-in jack mechanism is connected via the joint 7
And is detachably connected to the intermediate barrel 2.
Cleaning of the chuck mechanism and the inside of the shaft is extremely easy
Since it has a special effect, the industrial usefulness of the present invention is
Significantly large.

[Brief description of the drawings]

FIG. 1 is an overall longitudinal sectional view of a knock mechanical pencil of the present invention when it is extended.

FIG. 2 is an overall side view showing a partially cutout vertical cross section of the knock mechanical pencil of the present invention when it is reduced.

FIGS. 3A and 3B are cross-sectional views of various parts of the knock mechanical pencil according to the present invention shown in FIG. 1; FIG.
Sectional view taken in the direction of the arrow, (b) is a sectional view taken in the direction of the arrow B, (c) is a sectional view taken in the direction of the arrow C, and (d) is a sectional view taken in the direction of the arrow D.
(E) is a sectional view as seen in the direction of the arrow E, (f) is a sectional view as seen in the direction of the arrow F, and (g) is a sectional view as seen in the direction of the arrow G.

FIG. 4 is an explanatory view showing a detailed structure of a knock cylinder 10;
(A) is a half sectional side view showing the entirety of the knock cylinder 10, (b) is a sectional view taken along the arrow B in FIG. (A), and (c) is a sectional view taken along the arrow C in the same figure. (D) is a sectional view taken along the arrow D in the same manner.

FIG. 5 is an explanatory view showing a detailed structure of a lead holder 9;
(A) is a half sectional side view showing the entire core holder 9, (b) is a sectional view taken along the arrow B of FIG. (A), and (c) is a sectional view taken along the arrow C of FIG. (D) is a sectional view taken in the direction of arrow D.
FIG. 3E is a cross-sectional view taken along the arrow E in FIG.

6 (a) is an explanatory view of an engagement state between the lead holder 9 and the knock cylinder 10 when the core cylinder 9 is extended and contracted, and FIG. 6 (b) is a view taken in the direction of the arrow B in FIG. Sectional view, FIG.
Is rotated around the axis of the knock cylinder 10 in the direction of arrow A from the state shown in FIG.
FIG. 4 is a cross-sectional view showing a structure in which the core holder is engaged with a partial annular groove of the lead holder to prevent the lead holder and the knock cylinder from shifting in the longitudinal direction.

FIG. 7 is a perspective view showing the structure of a knock cylinder guide 11.

[Explanation of symbols]

 Reference Signs List 1 grip shaft portion 2 intermediate shaft tube 3 upper shaft tube 4 clip 41 bent portion of clip base 5 knock cap 6 screw ring 7 joint portion 8 joint portion 9 core holder 91 partial annular groove 92 annular groove for spring receiving 93 annular groove for retaining ring 94 Long axis direction guide groove 95 Side wall of partial annular groove 91 10 Knock cylinder 101 Annular convex part 102 Knock cylinder guide stop ring annular groove 103 Long axis direction guide groove 104 Tip inner cavity projection 11 Knock cylinder guide 111 Notch section 112 Annular Projection 113 Inner cavity guide projection 12 Prevention ring 13 Spring receiver 14 Lead metal 15 Tip pipe 16 Core breaker 17 Chuck 18 Clutch 19 Chuck spring 20 Intermediate spring 21 Knock spring 22 Clip stop 23 Eraser band 24 Eraser 25 Lead core 26 Click cylinder guide stop ring

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B43K 21/00 B43K 21/16

Claims (2)

(57) [Claims] An intermediate barrel ( 2 ), which has chuck mechanisms ( 17 ) and ( 18 ) and is detachably connected to a grip shaft ( 1) having a tip ( 14) at the tip via a joint ( 7) , is long inside the upper barrel (3). It is fitted and inserted so as to be able to move in the axial direction and to be rotatable around a fixed section axis. Further , the elastic force is applied from the rear end side of the upper barrel 3.
At the bottom, the knock section is mounted so that the knock section
One end of the core holder 9 is provided in the inner cavity of the
Into the core holder 9 so as to be freely movable in the longitudinal direction.
The other end is slidable in the long axis direction through the intermediate barrel 2.
At the rear end of the chuck 17
Do not face the connected joint 8 in a disconnected state.
When the writing shaft is extended due to transitions of the grip shaft portion 1 or the intermediate shaft tube 2 and the upper shaft tube 3 in mutually opposing longitudinal directions, the upper shaft tube 3 rotates clockwise around the shaft by a certain angle. engage and the knock sleeve 10 and the wick holder 9 by, changes in both cross the axial direction is prevented, while constant the transition prevents upper shaft tube 3 around an axis in a direction opposite to the said When the writing shaft is reduced due to the opposing transition of the knock cylinder 10 and the core holder 9 after being released by the angular rotation,
The tip of the knock cylinder 10 is configured to abut against a spring receiver 13 fitted and fixed to the core holder 9 , and in any case, the knocking operation of the knock cylinder 10 causes the core holder 9 to move .
Facing the joint part 8 of the chuck mechanism
A retractable knock mechanical pencil characterized in that the lead mechanism is operated by moving the chuck mechanism forward and the lead core is fed out. Wherein the transition to the long axis direction of the knock sleeve 10 and the wick holder 9 prevents the tip lumen protrusion 10 of the knock sleeve 10
4 is engaged with a partial annular groove 91 which is formed by bending in the circumferential direction continuously with the longitudinal guide groove 94 formed on the peripheral surface of the core holder 9. The telescopic knock mechanical pencil according to claim 1, characterized in that: