JP2014213548A - Lead holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lead holder capable of inhibiting unnecessary sending operation of a writing lead by having a lock mechanism inhibiting the movement of a slider.SOLUTION: The present lead holder comprises: a chuck unit 11 for allowing the forward movement of a writing lead L and inhibiting the backward movement; a slider 7 disposed on a front position of the chuck unit and moving relatively to the chuck unit in the axial direction; a spring 19 urging to press forward the slider; and a holding chuck 10 attached to the slider and coming into slide contact with the writing lead to temporarily hold the writing lead. By the forward movement of the slider caused by the spring 19 following the backward movement of the slider 7, the writing lead is sent out toward a tip guide member from the chuck unit 11. The lead holder further comprises a lock mechanism 8 for inhibiting the relative movement of the slider 7 to the chuck unit 11 in the axial direction.

Description

  The present invention relates to a mechanical pencil provided with a lock mechanism that can easily perform a drawing-out operation of a writing core and prevent an unnecessary drawing-out operation of the writing core.

  As is well known, mechanical pencils, for example, operate a knock portion protruding from the rear end portion of the shaft cylinder so that a fixed amount of writing core is fed out from the tip guide member disposed at the front end portion of the shaft cylinder. To do. That is, since the lead wears with the writing operation, it is necessary to knock the knocking portion every certain writing operation.

According to the knock type mechanical pencil described above, it is necessary to repeat the knocking operation relatively frequently each time the writing core is worn to some extent during the writing, and the knocking operation is performed by changing the shaft tube from the writing posture and changing the thumb. For example, it is forced to perform a knocking operation.
Therefore, the knocking operation for the feeding operation of the lead is not only troublesome, but also reduces the writing efficiency.

Therefore, in Patent Document 1, a ball chuck mechanism is used as a writing lead feeding means, and a tip guide pipe of the writing lead is attached to a slider movable in the axial direction, and the writing lead is temporarily attached to the slider by friction. There has been proposed a mechanical pencil called an auto sharp equipped with a holding chuck that can hold the chuck.
This mechanical pencil is configured so that the tip guide pipe is retracted according to the wear of the writing core, and the tip guide pipe is restored to its original state when one stroke of writing is completed. It works to slightly extend the writing core.

JP-A-62-158099

  By the way, according to the mechanical pencil disclosed in Patent Document 1, when the tip guide pipe moves backward due to vibrations when being carried or the like, there is a problem that the writing core is unnecessarily drawn out together with the return. Therefore, it not only causes problems such as breakage of the writing core, but also causes problems such as contamination of clothes by the drawn writing core.

  The present invention has been made paying attention to the problems of the mechanical pencil described above, and is equipped with a lock mechanism that prevents the movement of the slider even when it is subjected to vibrations when being carried, etc. An object of the present invention is to provide a mechanical pencil capable of preventing the operation.

  The basic form of the mechanical pencil according to the present invention, which has been made to solve the above-mentioned problems, is a chuck unit that allows the writing core to advance and prevents it from moving backward, and is positioned in front of the chuck unit, and A slider that relatively moves in the axial direction; a spring that urges the slider to push forward; and a holding chuck that is attached to the slider and that slidably contacts the writing core to temporarily hold the writing core. The writing core is fed out from the chuck unit toward the tip guide member by the forward movement of the slider following the backward movement of the slider, and the slider is axially moved with respect to the chuck unit. A lock mechanism that prevents relative movement is provided.

  In this case, the locking mechanism is preferably formed between the slider and a tip member that covers the slider, and the slider is provided with a locking portion that partially protrudes toward the outside. Is formed with a guide groove into which the engaging portion of the slider is inserted. In addition, the guide groove formed in the tip member includes a first guide groove portion where the locking portion is positioned at the forward position of the slider and a second guide where the locking portion is positioned at the retracted position of the slider. The groove portion is configured to communicate with the peripheral side surface of the tip member.

  More preferably, the first guide groove portion and the second guide groove portion formed in the guide groove of the tip member are formed so as to be orthogonal to the axial direction on the peripheral side surface of the tip member, and with the first guide groove portion The 2nd guide groove part employ | adopts the structure connected through the inclination groove | channel which inclines with respect to an axial direction along the surrounding side surface of the said tip member.

  In a preferred embodiment, the tactile member is connected to the engaging portion of the slider and is arranged outside the tip member, and the slider can be moved backward by operation of the tactile member. The

  In another preferable embodiment, the tip guide member is attached to the slider, and the slider is moved backward based on the backward movement of the tip guide member due to wear of the writing core.

  In any of the above-described forms, the chuck unit includes a chuck body portion in which a writing core insertion hole is formed in the shaft core, and a front end portion is radially divided by a plurality of slits formed in the axial direction. A ball chuck comprising a cylindrically formed holder having a tapered surface that expands the inner diameter toward the front, and a plurality of balls interposed between the chuck body and the tapered surface of the holder. It can be suitably employed.

  According to the mechanical pencil having the above-described configuration, a chuck unit that allows the writing core to advance and prevents retraction is used. A slider that moves relative to the chuck unit in the axial direction and is biased forward by a spring is used. A holding chuck is provided that slidably contacts the writing core and temporarily holds the writing core. Therefore, by moving the slider backward, the writing core can be fed out from the tip guide member by the forward movement of the slider by the spring.

Since the slider is provided with a lock mechanism that can be held in the retracted state, the slider moves relative to the chuck unit even when subjected to vibration, for example, when carrying a mechanical pencil. Is blocked.
Accordingly, it is possible to provide a mechanical pencil that can effectively prevent an unnecessary feeding operation of the writing core.

It is sectional drawing which showed the whole structure about the 1st form of the mechanical pencil concerning this invention. It is sectional drawing which expanded and showed the first half part of the mechanical pencil shown in FIG. It is sectional drawing of the state which similarly locked the movement of the slider. It is the perspective view which showed the external appearance structure of the tip member. It is the perspective view which showed the external appearance structure of the slider. It is a center sectional view in the state where the tip guide member and the screwing member were attached to the slider. It is a side view of a slider. It is the front view which looked at the slider from the rear-end part side. It is sectional drawing which expanded and showed the first half part about the 2nd form of the mechanical pencil concerning this invention. It is sectional drawing of the state which similarly locked the movement of the slider.

  A mechanical pencil according to the present invention will be described based on an embodiment shown in the drawings. In the drawings shown below, the same part or a part that performs the same function is indicated by the same reference numeral. However, in some drawings, a representative part is indicated by a reference numeral for the sake of space, and the details thereof are described. The configuration may be described with reference to reference numerals attached to other drawings.

First, FIG. 1 to FIG. 7 show a first embodiment of a mechanical pencil according to the present invention, and FIG. 1 shows a whole structure in a sectional view.
As shown in FIG. 1, the shaft cylinder constituting the outline of the mechanical pencil is constituted by a front shaft 1 and a rear shaft 2, and the front shaft 1 and the rear shaft 2 have a central connecting pipe 3. Via a straight line.

  That is, the connecting pipe 3 is formed in a cylindrical shape, and the rear half portion in the axial direction is fitted and attached to the front end portion of the rear shaft 2. Further, a male thread is formed in the front half of the connecting pipe 3, and the leading shaft 1 and the rear shaft 2 are connected to the connecting pipe 3 by screwing a female screw formed at the rear end of the leading shaft 1. Connected in the center.

As shown in FIG. 2, a short shaft-like connection member 4 is screwed onto the front end portion of the front shaft 1, and a front end portion 5 is fitted to the front end portion of the connection member 4. It is attached.
That is, the mouth end portion 5 is detachably attached to the front end portion of the tip shaft 1 through the connection member 4.
As shown in FIG. 4, the lip portion 5 is formed in a cylindrical shape and is configured to be thinned stepwise toward the front. In this embodiment, the circle of the lip portion 5 is formed. A tip pipe 6 that functions as a tip guide member of the writing core L is attached to the columnar tip 5a.

  In FIG. 6, the tip pipe 6 is attached to the front end portion of the lip portion 5 with the lip portion 5 as the center, and the short shaft-like connecting member 4 is attached to the rear end portion of the lip portion 5 by fitting. The resulting configuration is shown in cross section. In addition, the code | symbol 4a shown in FIG. 6 has shown the external thread formed in the connection member 4 screwed with respect to the above-mentioned front axis | shaft 1. FIG.

Further, as shown in FIGS. 4 and 6, a pair of guide grooves 5 b formed in the axial direction at the axially symmetrical positions at the rear end of the mouth portion 5 are formed on the peripheral side surface of the mouth portion 5. Is formed.
The guide groove 5b functions as a lock mechanism 8 that prevents the slider 7 described later from moving in the axial direction. The guide groove 5b includes a first guide groove portion 5c and a second guide groove portion 5d. It is configured to communicate with each other via an inclined groove 5e that is inclined with respect to the axial direction.
The operation of the locking mechanism 8 of the slider 7 by the guide groove 5b will be described in detail later.

  On the other hand, as shown in FIG. 2, a slider 7 is accommodated in the above-mentioned mouth portion 5 so as to be slidable in the axial direction. The slider 7 is also formed in a cylindrical shape so as to become thinner stepwise toward the front, similar to the tip 5, and the unit configuration is shown in FIGS. 5, 7, and 8. Yes.

As shown in FIGS. 5, 7, and 8, a connecting portion 7 a is formed on the rear end portion of the slider 7 in an axially symmetric position, that is, a position facing 180 degrees toward the outside. An annular member 7b is formed integrally with the slider 7 via 7a.
The pair of connecting portions 7 a formed on the slider 7 is a pair of the connecting portions 7 a formed at axially symmetrical positions at the rear end of the mouth portion 5 in a state where the slider 7 is accommodated in the mouth portion 5. It is configured to be inserted into the guide groove 5b.

As a result, the annular member 7b of the slider 7 is disposed so as to surround the outer periphery of the lip portion 5 at the rear end portion of the lip portion 5 as shown in FIG.
That is, after the pair of connecting portions 7a of the slider 7 is inserted into the guide groove 5b of the lip portion 5, the connecting member 4 is fitted to the rear end portion of the lip portion 4 as shown in FIG. Will be attached.

A ring-shaped finger member 9 is attached to the outside of the annular member 7 b of the slider 7. That is, in this embodiment, the ring-shaped tactile member 9 is disposed immediately before the front end portion of the front shaft 1.
On the other hand, a rubber holding chuck 10 having a through hole formed in the center is accommodated in the front end opening 7c of the slider 7, and the central through hole of the holding chuck 10 slides on the peripheral surface of the writing core L. It acts so as to contact and temporarily hold the writing core L by friction.

A ball chuck 11 serving as a chuck unit that holds the writing core L is disposed in the internal space of the slider 7. The ball chuck 11 includes a holder 12 formed in a cylindrical shape and having a tapered surface whose inner peripheral surface expands forward, and is accommodated in the holder 12 and passes through the writing core L along the axis. A chuck body portion 13 having a hole formed therein and a front end portion thereof radially divided by a plurality of slits formed in the axial direction, an outer peripheral surface of the chuck body portion 13, and an inner peripheral surface of the holder 12 And a plurality of balls 14 disposed between them.
An annular stopper member 15 that prevents the ball 14 from dropping off is fitted into the inner peripheral surface of the front end portion of the holder 12.

  Accordingly, when the writing pressure is applied to the writing core L, the ball chuck 11 is in contact with the tapered surface of the cylindrical holder 12 together with the ball 14 so that the writing core L is the chuck body. It is gripped strongly by the part 13. Thereby, the retraction of the writing core L in the ball chuck 11 is prevented.

  On the other hand, when the force that pulls the writing core L forward is applied, the chuck body 13 is not affected by the holder 12, and therefore the writing core L can be pulled forward with relatively little resistance. That is, the ball chuck 11 acts to allow the writing core L to move forward and prevent it from moving backward.

A coiled spring 17 is disposed so as to surround the central portion of the chuck main body 13 in the length direction. A front end portion of the spring 17 is locked to the holder 12, and a rear end portion of the spring 16 is a chuck. The main body 13 is locked.
Accordingly, the spring 17 acts to urge the chuck body 13 toward the rear in the axial direction, whereby the ball chuck 11 is in a state of gripping the writing core L. For convenience, the spring 17 is referred to as a chuck spring.

The slider 7 is configured to be slidable in the axial direction with respect to the outer peripheral surface of the holder 12 constituting the ball chuck 11, and the holder 12 is arranged on the inner peripheral surface of the holder support pipe 18 on the rear end side. It is fitted and attached.
A spring 19 is accommodated between the slider 7 and the connecting member 4. The spring 19 acts to push the slider 7 forward, and the spring 19 is referred to as a slider pushing spring for convenience.

A spring 21 is accommodated between the rear end portion of the connecting member 4 and the large diameter portion 18 a formed on the holder support pipe 18, and the large diameter portion 18 a of the holder support pipe 18 is accommodated by the spring 21. Is brought into contact with a stepped portion 1 a formed in the front shaft 1.
Thus, the chuck unit 11 including the holder 12 is positioned, and the spring 21 is called a chuck unit positioning spring for convenience.

  On the other hand, a short shaft-shaped shaft member 22 having a through hole for the writing core L is disposed immediately after the chuck body 13 in the holder support pipe 18 so as to be movable in the axial direction. A core case 23 is fitted and attached to the rear end portion of the short shaft-shaped shaft member 22, and the front end portion of the shaft member 22 is accompanied by a forward movement of the core case 23 by a knocking operation described later. Abuts against the rear end of the chuck body 13 and acts to push the chuck body 13 forward.

  A clip 25 is attached to the outside of the rear end portion of the rear shaft 2 as shown in FIG. 1, and a knock operation body 26 is movable in the axial direction in the rear end portion of the rear shaft 2. Contained. A return spring 27 of the knock operation body 26 is disposed between the front end portion of the knock operation body 26 and the connection pipe 3.

Further, a refill hole 26a for the writing core L is formed at the rear end portion of the knock operation body 26, and a rear end portion of the lead case 23 is in contact with the partition wall portion where the refill hole 26a is formed. The rear end portion of the short relay member 28 attached to is fitted.
Further, an eraser 29 is detachably attached to the knock operating body 26 so as to close the replenishment hole 26a of the writing core L, and a knock cover 30 functioning as a knock member covering the eraser 29 has a knock operation. The body 26 is detachably attached to the peripheral surface of the rear end portion.

Accordingly, by knocking the knock cover 30 that functions as a knock member, the lead case 23 moves forward via the knock operation body 26. By the forward movement of the lead case 23, the short shaft-shaped shaft member 22 shown in FIG. 2 moves forward and pushes the chuck body 13 forward.
As a result, the chuck body 13 moves forward relative to the holder 12 while holding the writing core L. When the knocking operation is released, the knocking operation body 26 is retracted by the action of the return spring 27 and returns to the state shown in FIG.

At this time, the chuck body 13 is retracted by the action of the chuck spring 17, but the writing core L is held by the friction of the holding chuck 9 accommodated in the slider 7, so that the chuck body 13 is retracted. With the operation, the writing core L is relatively pulled out from the chuck body 13, and the leading end portion of the writing core L is maintained in a state where it is drawn out from the leading end pipe 6.
Therefore, each time the knocking operation described above is repeated, the writing core L can be fed out from the tip pipe 6 by a predetermined amount.

  Further, by maintaining the knock cover 29 in the knocked state, the chuck body 13 is brought into a state in which the gripping of the lead L is released. Can be pushed back.

In this embodiment, a ring-shaped tactile member 9 is disposed immediately before the front end portion of the tip shaft 1 described above, and the tactile member 9 is moved toward the rear in the axial direction with a fingertip or the like. By pushing up, the slider 7 can be slid backward as shown in FIG.
After the push-up operation of the finger member 9, the slider 7 moves forward by the action of the spring 19, so that the writing core L held by the friction of the holding chuck 10 is pulled out from the ball chuck 11, and the writing core L The feeding operation is realized.

Therefore, according to this embodiment, writing is performed by the action of the spring 19 described above by knocking the knock cover 30 or pushing the finger member 9 rearward in the axial direction. The core L can be paid out from the tip pipe 6.
Therefore, particularly when the tactile member 9 is used, the lead L can be unwound from the end pipe by, for example, slightly pushing up the tactile member 9 with the index finger in a writing posture while holding the shaft cylinder. You can continue writing without losing efficiency.

By the way, according to the above-described embodiment, the writing core L is unnecessarily drawn out by repeating the retreat operation due to vibration or the like when the tactile member 9 is subjected to vibration or the like, for example, during conveyance other than when the mechanical pencil is used. Problems occur.
Therefore, in this embodiment, the lock mechanism 8 is formed between the tip portion 5 and the slider 7 as described above.

That is, as shown in FIGS. 4 and 6, a pair of guide grooves 5 b is formed in the mouth portion 5, and a connecting portion 7 a of the slider 7 is accommodated in the guide groove 5 b.
Then, in the unlocked state of the lock mechanism 8 in which the mechanical pencil is to be used, that is, in the state shown in FIG. 2 in which the slider 7 has advanced, the connecting portion 7a of the slider 7 (this connecting portion 7a is also referred to as a locking portion). Is located in the front end portion in the axial direction of the guide groove 5b, that is, in the first guide groove portion 5c orthogonal to the axial direction.

In this state, it is possible to push up the ring-shaped touching finger member 9 with the fingertip or the like toward the rear in the axial direction, whereby the slider 7 moves the guide groove 5b in the axial direction together with the locking portion 7a. Retreat along.
Then, the writing core L can be fed out from the tip pipe 6 by the forward movement of the slider 7 by the action of the spring 19 following the backward movement of the finger member 9.

  On the other hand, when the finger member 9 is rotated counterclockwise in the unlocked state of the lock mechanism 8 shown in FIG. 2, the locking portion 7 a of the slider 7 moves up the inclined groove 5 e formed in the lip portion 5 while moving the slider 7, the locking portion 7a of the slider 7 is locked in the second guide groove portion 5d orthogonal to the axial direction. That is, the slider 7 moves backward as shown in FIG. 3, and the lock mechanism 8 is locked.

In this locked state, the slider 7 is maintained in the retracted state, and the slider 7 is prevented from moving relative to the chuck unit 11 in the axial direction. Thereby, the problem that the writing core L is unnecessarily drawn out is solved.
And in order to cancel | release the locked state of the above-mentioned locking mechanism 8, it can return to the non-locking state shown in FIG. 2 by rotating the said tactile member 9 clockwise.

FIGS. 9 and 10 show a second embodiment of the mechanical pencil according to the present invention. FIGS. 9 and 10 are the same as FIGS. 2 and 3 shown in the first embodiment. Correspondingly, the unlocked state and the locked state of the lock mechanism 8 are respectively shown.
In the second embodiment, a tip pipe 6 that functions as a tip guide member is attached to the tip of the slider 7. That is, the tip pipe 6 is configured to be movable in the axial direction together with the slider 7, and the other configurations are the same as those of the first embodiment already described.

The mechanical pencil having this configuration is also called auto-sharpening. When the writing core L is worn as writing progresses, the tip pipe 6 comes into contact with the writing surface, and the tip pipe 6 gradually moves back together with the slider 7.
At the moment when the writing pressure is released, the slider 7 and the tip pipe 6 are moved forward by the action of the spring 19, so that the holding chuck 10 disposed on the slider 7 is also moved forward, whereby the writing core L is moved from the ball chuck 11. Pulled out. Therefore, the writing core L corresponding to the amount worn by writing is automatically paid out.

  According to the second embodiment, the writing core L is removed from the distal end pipe 6 by knocking the knock cover 30 and pushing the finger member 9 rearward in the axial direction. It can be fed out and also has the function as the auto-sharp described above.

  In the second embodiment as well, although there is a problem in that the tip pipe 6 moves backward due to vibration during conveyance of the mechanical pencil and the writing core L is unnecessarily drawn out, the lock mechanism 8 described above is used. By providing this, this can be solved.

  In the embodiment described above, the slider 7 is retracted by rotating the finger member 9 counterclockwise so that the lock mechanism 8 is in the locked state. By configuring the arrangement position of the first guide groove portion 5c and the second guide groove portion 5d and the inclination direction of the inclined groove 5e in an axially symmetric relationship with respect to the embodiment, the finger member 9 can be locked by rotating it to the right. The mechanism 8 can be locked.

  In the above-described embodiment, the slider 7 is locked at the position where the slider 7 is retracted, that is, the slider 7 is prevented from moving in the axial direction. Even if it comprises, it can obtain the same effect.

For this purpose, as the guide groove formed in the above-mentioned mouth part 5, an L-shape is formed by connecting a groove along the axial direction on the peripheral side surface of the mouth part and a groove perpendicular to the axial direction at the front end part of this groove. This can be realized by forming a groove.
By forming this L-shaped groove, the above-described locking portion 7a of the slider 7 can advance along the axial groove, and can enter the groove orthogonal thereto, whereby the slider 7 moves forward. In this state, a locked state in which movement in the axial direction is prevented can be achieved.

1 Lead shaft (shaft tube)
2 Rear shaft (shaft tube)
4 connecting member 4a male screw 5 tip 5a cylindrical tip 5b guide groove 5c first guide groove 5d second guide groove 5e inclined groove 6 tip pipe (tip guide member)
7 Slider 7a Connecting part (locking part)
7b annular member 7c front end opening 8 lock mechanism 9 feeler member 10 holding chuck 11 ball chuck (chuck unit)
12 Holder 13 Chuck Main Body 14 Ball 17 Chuck Spring 19 Slider Extrusion Spring 22 Shaft Member 23 Core Case 25 Clip 26 Knock Operating Body 27 Return Spring 30 Knock Cover L Writing Core

Claims (6)

A chuck unit that allows the writing core to advance and prevents retraction, a slider that is positioned in front of the chuck unit and that moves relative to the chuck unit in the axial direction, and a spring that urges the slider to push it forward And a holding chuck that is attached to the slider and that slidably contacts the writing core and temporarily holds the writing core,
The writing core is fed out from the chuck unit toward the tip guide member by the forward movement of the slider following the backward movement of the slider, and the slider is axially relative to the chuck unit. Mechanical pencil with a locking mechanism that prevents it from moving. The locking mechanism is formed between the slider and a tip member that covers the slider, and the slider is provided with a locking portion that partially protrudes outward, and the tip portion is associated with the slider. A guide groove into which the stop is inserted is formed,
The guide groove formed in the front end portion includes a first guide groove portion where the locking portion is positioned at the advance position of the slider and a second guide groove portion where the locking portion is positioned at the retracted position of the slider. The mechanical pencil according to claim 1, wherein the mechanical pencil is formed in communication with a peripheral side surface of the tip member.   The first guide groove portion and the second guide groove portion formed in the guide groove of the tip member are formed so as to be orthogonal to the axial direction on the peripheral side surface of the tip member, and the first guide groove portion and the second guide groove portion The mechanical pencil according to claim 2, wherein the mechanical pencil communicates with an inclined groove inclined with respect to an axial direction along a peripheral side surface of the tip member.   The tactile member is connected to the engaging portion of the slider and is arranged on the outside of the tip member, and the slider can be moved backward by operation of the tactile member. The mechanical pencil according to any one of claims 1 to 3.   4. The structure according to claim 1, wherein the tip guide member is attached to the slider, and the slider is moved backward based on a backward movement of the tip guide member due to wear of the writing core. The mechanical pencil described in any one of the items.   The chuck unit has a writing core insertion hole formed in the shaft core, a front end portion radially divided by a plurality of slits formed in the axial direction, and a cylindrically formed front portion. 2. A ball chuck comprising: a holder having a tapered surface whose inner diameter increases toward the surface; and a plurality of balls interposed between the chuck body and the tapered surface of the holder. The mechanical pencil according to any one of claims 1 to 5.

Images