JPH09142081A - Writing implement with rod-shaped body delivery device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect positively the rear shaft with a rod-shaped body delivery device provided thereto to the front shaft, and avoid the rear shaft from disconnecting during use by permitting the other contact surface to slide along one slanted contact surface as the rear shaft turns around, and also permitting the front shaft to disconnect from the rear shaft through the withdrawal of the rear shaft. SOLUTION: In the case of disconnecting a front shaft 1 from the rear shaft 17 for housing cores 2 within a core case 12, by turning the rear shaft 17, the cut part 17B of the rear shaft 17 is withdrawn alone the slanted projection 1F of the front shaft 1, so that the inward projection 17A of the rear shaft 17 disconnects from the recess 1D of the front shaft 1. Accordingly, in comparison with the mere rearward extraction of the rear shaft 17, the rear shaft 17 can be disconnected with ease. After disconnecting the rearshaft 17, by retaining the rear part 14B of a plug 14 projected in a plate-shaped manner, the plug 14 is disconnected from the front shaft 1. Thus, the rear part of the core case 12 comes out in a manner projecting from the rear end of the front shaft 1. Then, cores 2 are inserted therein from the rear end of the core case 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing instrument with a rod-shaped body feeding device in which a rear shaft is detachably connected to a front shaft of a writing instrument such as a mechanical pencil or a ballpoint pen, and a rod-shaped body feeding device is formed on the rear shaft.

[0002]

2. Description of the Related Art Conventionally, a stick-shaped body feeding device provided at the rear of a writing instrument connects a front shaft and a rear shaft by engaging a recess and a projection, or a front shaft and a rear shaft by frictionally fitting them. Or, the front shaft was screwed and connected to the rear shaft.

[0003]

Therefore, when the front shaft and the rear shaft are firmly engaged with each other or frictionally fitted, the rear shaft has to be pulled rearward with a strong force when being disengaged. Further, in the case where the rear shaft can be easily removed, there is a risk that the rear shaft may come off when the rod-shaped body is extended. Further, when the front shaft and the rear shaft are screwed together, it is very difficult to align the front shaft and the rear shaft in the circumferential direction, and the operation of disconnecting and connecting them is troublesome. An object of the present invention is to provide a writing instrument with a rod-shaped body feeding device that solves the above problems.

[0004]

In order to achieve the above object, the present invention provides an operation button which is slidable in a longitudinal direction along a sliding groove of a rear shaft, and operates the operation button to form a rod-shaped body. In the writing instrument with a rod-shaped body feeding device that feeds, at least one of the contact surfaces of the front shaft and the rear shaft that are engaged and coupled to each other is configured to be inclined in the longitudinal direction, and when the rear shaft is rotated, The other contact surface slides along one inclined contact surface, and the rear shaft is retracted as the contact surface slides so that the front shaft and the rear shaft are disengaged. .

[0005]

EXAMPLE A writing instrument according to the present invention will be described with reference to FIGS. 1, 2, 3 and 4 in which a writing instrument of the present invention is constituted by a side knock type mechanical pencil and an eraser is used for a rod-shaped body. A base 4 having a built-in core holder 3 for lightly holding the core 2 is screwed onto the front portion of the front shaft 1. Front axis 1
The connecting tool 5 is held by the front end 1A of the and the inner step 4A of the base 4. A tightening ring 6 is loosely fitted between the connector 5 and the locking step 4B of the base 4, and the tightening ring 6 is a head 7A of the chuck 7.
Is fitted to the outside. A chuck holder 8 is fixed to the rear portion of the chuck 7, and the connecting tool 5 and the outer stage 8 of the chuck holder 8 are attached.
The chuck 7 is urged rearward in the longitudinal direction by the spring 9 stretched between A and A. The chuck 7 biased rearward by the spring 9 is closed by being pressed by the tightening ring 6, and strongly holds the core 2. An elastic body 10 such as a rubber such as an elastomer is externally fitted to the grip portion of the front shaft 1. There are various conceivable means for attaching the elastic body 10. For example, a so-called double molding method in which the front shaft 1 is first injection-molded and then the elastic body 10 is injection-molded is conceivable. As shown in FIG. 2, an opening window 1B is formed in the middle portion of the front shaft 1, and the opening portion 1A of the side button 11 having a U-shaped cross section is inserted into the opening window 1B while being bent. The side button 11 is attached to the opening window 1B. The side button 11 is made of synthetic resin such as polyacetal. A core tank 12 made of a pipe material is fixed to the chuck holder 8, and the core tank 12 has a foot portion 11A of a side button 11.
Through the front end of the front shaft 1 to project from the rear end. Wick tank 12
A cam member 13 is externally fitted on the outside of the cam member 1.
The foot portion 11A of the side button 11 is in contact with the inclined rear end surface 13A of the side button 3. Therefore, by pressing the side button 11, the foot portion 11A of the side button 11 presses the inclined rear end surface 13A of the cam member 13 and advances the cam member 13. When the cam member 13 advances, the cam member 13 contacts the outer collar 8B of the chuck holder 8, and the chuck 7 advances together with the chuck holder 8 and the lead tank 12, and the lead 2 is fed. Cam member 13 is nylon 6
It is made of polyamide resin such as 6. At the rear end of the front shaft 1,
A plug 14 having a front portion 14A slit is detachably attached, and a rear portion 14B of the plug 14 has a plate-like shape that is easily held by a finger. Without this plug 14, the core 2 stored in the core tank 12 abuts on a rod-shaped holder 15 described later, and the rod-shaped holder 15 is slid in the longitudinal direction in order to use the eraser 16 which is a rod-shaped body. The core 2 is pressed when it moves
May be broken. A small diameter portion 1C is formed in the rear portion of the front shaft 1, and a circumferentially extending recess 1D is formed in the small diameter portion 1C. Further, the small diameter portion 1C of the front shaft 1 is formed with a protrusion 1F projecting rearward from the rear outer step 1E on the extension line of the opening window 1B. The protrusion 1F is formed by two protrusions 1F inclined at 45 degrees. Therefore, the rear outer stage 1E and the protrusion 1F form a contact surface with the rear shaft 17. Rear axle 17
An inner protrusion 17A is formed on the inner surface of the front part of the above, and silicone oil is applied to the inner protrusion 17A. The inward projection 17A of the rear shaft 17 is fitted into the recess 1D of the front shaft 1, and the rear shaft 17 is detachably connected to the small diameter portion 1C of the front shaft 1. Moreover, as shown in FIG. 5, at the front end of the rear shaft 17, the protrusion 1 of the front shaft 1
A notch 17B having the same shape as F is formed, and the front end and the notch 17B are formed.
To form a contact surface with the front shaft 1. Front shaft 1 protrusion 1F
By aligning the notch 17B of the rear shaft 17 with the contact surface of the front shaft 1 and the contact surface of the rear shaft 17, the front shaft 1 and the rear shaft 17 are positioned in the circumferential direction. A sliding groove 17C extending in the longitudinal direction is formed on the rear shaft 17, and the sliding groove 17C is further formed.
A plurality of locking grooves 17D intersecting with are formed at equal intervals in the longitudinal direction. As shown in FIG. 6, an elastic piece 15B is formed on the rod-shaped body holding tool 15 by two cut grooves 15A extending in the longitudinal direction, and a locking portion 15C protruding rearwardly from the elastic piece 15B. Then, a fixing hole 15E that communicates with the guide groove 15D that widens rearward is formed. The rod-shaped holder 15 has a rear shaft 1
7 is installed so as to be slidable in the longitudinal direction. In this rod-shaped body holder 15, the foot portion 18A of the operation button 18 inserted from the sliding groove 17C of the rear shaft 17 is guided by the guide groove 15D and fitted into the fixing hole 15E. An eraser 16 is attached to the rear hole 15F of the rod-shaped body holder 15. The eraser 16 retreats together with the rod-shaped body holder 15 by moving the operation button 18 rearward and protrudes from the rear end of the rear shaft 17, and the locking portion 15C of the rod-shaped body holder 15 locks the rear shaft 17. It is fixed by being locked in the groove 17D. In order to immerse the eraser 16 in the rear shaft 17, the operation button 18 is pushed inward so that the locking groove 17 of the rear shaft 17 is pressed.
With the locking portion 15C of the rod-shaped body holder 15 removed from D, the operation button 18 is moved forward to move the rod-shaped body holder 1
5 and the eraser 16 are advanced.

When the front shaft 1 and the rear shaft 17 are disconnected from each other in order to store the core 2 in the core tank 12, the rear shaft 17 is turned so that the cutout portion 17B of the rear shaft 17 becomes the front shaft 1. Retreating along the inclined projection 1F, the inward projection 17A of the rear shaft 17 comes off from the recess 1D of the front shaft 1. Therefore, simply rear axle 1
The rear shaft 17 can be easily removed as compared with the case where the rear shaft 7 is pulled out backward. After removing the rear shaft 17, the stopper 1 protruding in a plate shape
The rear portion 14B of No. 4 is held and the plug 14 is removed from the front shaft 1. Then, the rear portion of the lead tank 12 protruding from the rear end of the front shaft 1 appears. The lead 2 is inserted from the rear end of the lead tank 12.

In the first embodiment, the inner projection 17A of the rear shaft 17 is coated with silicone oil, but this does not cause wear of the inner projection 17A even when the front shaft 1 and the rear shaft 17 are repeatedly attached and detached. This is to prevent it. In the first embodiment,
Actually taking out 10 pieces each and performing a detachment test of the front shaft 1 and the rear shaft 17, when the silicone oil was not applied, the inner protrusion 17A was worn out more than half after 3000 times of attachment and detachment. There was rattling in the engagement between the shaft 1 and the rear shaft 17, which made it impractical. However, the one coated with silicone oil has an inward protrusion 17 even if it is repeatedly attached and detached 30,000 times.
A was hardly worn, and rattling did not occur even when the front shaft 1 and the rear shaft 17 were engaged.

A rod-shaped body feeding device is shown in FIGS. 7 and 8.
As in the second embodiment shown in FIG. 5, the operation button 118 is integrally formed on the elastic piece 115B of the rod-shaped body holding tool 115, and the operation button 118 is projected from the inside through the sliding groove 17C of the rear shaft 17. You may let me.

Further, the means for feeding out the rod-shaped body is not limited to the above-mentioned embodiment, but the operation button is operated along the sliding groove of the rear shaft, and the engaging portion of the rod-shaped body holder is mounted on the rear shaft. Various means can be used as long as they can be locked in the locking groove.

Next, another embodiment of the engaging means for the front shaft and the rear shaft in the present invention will be described.

9 and 10 show a third embodiment of the present invention, in which a notch 101G is formed on the contact surface formed on the rear outer step 101E of the front shaft 101. The edge of the notch portion 101G is inclined at 45 degrees and is notched so as to widen rearward. Therefore, the rear outer stage 10
A contact surface with the rear shaft 117 is formed by 1E and the cutout portion 101G. At the front end of the rear shaft 117, the notch 1 of the front shaft 101 is formed.
A protrusion 117E having the same shape as 01G is formed. The front shaft 10
The notch 101G of No. 1 and the protrusion 117E of the rear shaft 117 are brought into contact with each other to bring the contact surface of the front shaft 101 and the contact surface of the rear shaft 117 into contact with each other, and the rear shaft 117 into the recess 101D of the front shaft 101.
117A of the inward projection of
The rear shaft 117 is detachably connected to 01C. When disconnecting the front shaft 101 and the rear shaft 117, the rear shaft 117
By rotating, the projection 117E of the rear shaft 117 is moved to the front shaft 1
01 is recessed along the notched portion 101G, and the inward projection 117 of the rear shaft 117 extends from the recess 101D of the front shaft 101.
A can come off easily.

FIG. 11 shows a fourth embodiment of the present invention, in which a projection 1F protruding rearward from a rear outer step 1E of the front shaft 1 is shown.
Is formed, and the protrusion 1F is formed by two protrusions 1F inclined at 45 degrees. Therefore, the rear outer step 1E and the protrusion 1F form a contact surface with the rear shaft 217. Rear shaft 2
A notch 217B, which is larger than the protrusion 1F of the front shaft 1 and is notched in a square shape, is formed at the front end of the front shaft 1, and a contact surface with the front shaft 1 is formed by the front end and the notch 217B. The protrusion 1F of the front shaft 1 and the notch 217B of the rear shaft 217 are brought into contact with each other to bring the contact surface of the front shaft 1 and the contact surface of the rear shaft 217 into contact with each other, and the recessed portion of the front shaft 1 is provided with the rear shaft 217. The inward projection is fitted and the rear shaft 217 is detachably connected to the small diameter portion of the front shaft 1. When disconnecting the front shaft 1 and the rear shaft 217,
By turning the rear shaft 217, the notch 21 of the rear shaft 217
7B retracts along the inclined projection 1F of the front shaft 1, and the inward projection of the rear shaft 217 is easily disengaged from the recess of the front shaft 1.

In each of the above-mentioned embodiments, the front shaft and the rear shaft are formed by forming the recess in the front shaft and the inward projection in the rear shaft, and by fitting the inward projection in the rear shaft into the recess in the front shaft. Although removably connected, the present invention is not limited to the above embodiment.

As in the fifth embodiment shown in FIG. 12, the inner shaft 201H is formed on the front shaft 201 and the rear shaft 31 is formed.
7, a recess 317F is formed, and the inward projection 20 of the front shaft 201 is formed.
The front shaft 201 and the rear shaft 317 may be detachably connected by fitting 1H into the recess 317F of the rear shaft 317. Also in this case, the inward projection 201 of the front shaft 201
Apply silicone oil to H. The same effect can be obtained by applying silicon oil to the recess 317F.

Alternatively, as in the sixth embodiment shown in FIG. 13, the small diameter portion 301C of the front shaft 301 and the inner surface of the rear shaft 417 may be frictionally fitted and removably connected.

Further, in the above-mentioned embodiments, the writing instrument has been described by taking the side knock type mechanical pencil for pushing out the lead by pressing the side button as an example. However, the writing instrument of the present invention may be a mechanical pencil for pushing out the lead by other means. There is no problem.

Further, the writing instrument used in the present invention is not limited to the mechanical pencil, and various types can be used.

The seventh shown in FIGS. 14, 15 and 16
In the embodiment, a ballpoint pen is used as a writing tool. More specifically, a tail plug 20 made of a magnetic material such as iron is fitted to the rear portion of the ballpoint pen refill 19, and the ballpoint pen refill 19 is slidable in the longitudinal direction.
1 is built in. In the portable state of FIG. 14, the ballpoint pen refill 19 is moved rearward in the longitudinal direction by carrying the writing tip portion, that is, the tip of the front shaft 401 upward, and the outer collar 20A of the tail plug 20 is moved to the front end of the rear shaft 517. It is in contact with the magnet 21 fixed to the. Moreover, the guide member 2 made of a non-magnetic material such as brass is provided in the front shaft 401.
2 is loosely fitted, and the outer flange 20A of the tail plug 20 is guided by the inner hole 22A of the guide member 22. Therefore, the tail plug 20 is located at the center of the front shaft 401. When writing with the ball-point pen refill 19, as shown in FIG. 15, by directing the writing tip end downward, the ball-point pen refill 19 moves forward and the tip of the ball-point pen refill 19 is opened at the tip opening hole of the front shaft 401. It protrudes from 401I. Further, since the guide member 22 also moves forward due to its own weight and contacts the locking step 401J of the front shaft 401,
The guide of the tail plug 20 by the guide member 22 is released.
Therefore, the ball-point pen refill 19 tilts in the front shaft 401, the tail plug 20 is attracted by the magnet 21, and the rear end of the tail plug 20 is attracted to the front end of the magnet 21. Therefore,
Even if a writing pressure is applied to the ballpoint pen refill 19, the ballpoint pen refill 19 does not move backward. To immerse the ballpoint pen refill 19, the guide member 22 is moved backward with the writing tip end facing upward, and when the guide member 22 guides the tail plug 20 to the center, the tail plug 20 separates from the magnet 21. Then, the ball-point pen refill 19 retracts by its own weight, the rear portion 20B of the tail plug 20 is inserted into the inner hole 21A of the magnet 21, and the state of FIG. 14 is restored.

When replacing the ball-point pen refill 19, by rotating the rear shaft 517, the protrusion 517 of the rear shaft 517 is formed along the inclined notch 401G of the front shaft 401.
E moves backward, and the rear shaft 517
The outer protrusion 517G of the Therefore, the rear shaft 517 can be easily removed. When the rear portion of the front shaft 401 is directed downward, the ballpoint pen refill 19 is discharged from the rear end of the front shaft 401 as shown in FIG. The tail plug 20 is removed from the ballpoint pen refill 19, the tail plug 20 is fitted to a new ballpoint pen refill 19, and the ballpoint pen refill 19 is inserted into the front shaft 401. Further, the rear shaft 5 is inserted into the recess 401D of the front shaft 401.
A new ballpoint pen refill 19 is accommodated by fitting the outer protrusion 517G of the numeral 17.

In each of the above examples, an eraser is used as the rod-shaped body, but the rod-shaped body of the present invention is not limited to the eraser, and in addition to the eraser, a pencil lead, a colored pencil lead, a crayon, a solid Various sticks such as a correction tool and a solid cosmetic tool can be used.

[0021]

According to the present invention described above, the rear shaft provided with the rod-shaped body feeding device can be reliably connected to the front shaft constituting the writing instrument, and there is no fear that the rear shaft will come off during use of the writing instrument or the rod-shaped body. In addition, since the rear shaft can be removed extremely easily, the effect of easily inserting the lead or replacing the refill of the writing instrument can be achieved.

[Brief description of the drawings]

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

FIG. 2 is an enlarged cross-sectional view showing line AA in FIG.

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

FIG. 4 is a plan view of FIG. 1;

FIG. 5 is a main part plan view showing a state before connecting the rear shaft to the front shaft in the first embodiment.

FIG. 6 is a plan view showing an eraser holder of the first embodiment.

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

FIG. 8 is a sectional view taken along line AA of FIG. 7;

FIG. 9 is a cross-sectional view of main parts showing a third embodiment of the present invention.

FIG. 10 is a plan view of FIG. 9;

FIG. 11 is a main part plan view showing a fourth embodiment of the present invention.

FIG. 12 is a sectional view of a main portion showing a fifth embodiment of the present invention.

FIG. 13 is a cross-sectional view of main parts showing a sixth embodiment of the present invention.

FIG. 14 is a sectional view showing a portable state of a seventh embodiment of the present invention.

FIG. 15 is a sectional view showing a writing state of a seventh embodiment.

FIG. 16 is a partial cross-sectional view of a main portion showing a state in which a rear shaft is removed and a ballpoint pen refill is taken out in a seventh embodiment.

[Explanation of symbols]

 1 front shaft 1D recessed part of front shaft 1 17 rear shaft 17A inward projection of rear shaft 17C sliding groove of rear shaft 17 operation button 101 front shaft 101D recessed part of front shaft 101 117 rear shaft 118 operation button 201 front shaft 201H Inner protrusion 217 of front shaft 201 Rear shaft 301 Front shaft 317 Rear shaft 317F Recess of rear shaft 317 401 Front shaft 401D Recess of front shaft 401 417 Rear shaft 517 Rear shaft 517G Outer protrusion of rear shaft 517

Claims (4)

[Claims] 1. A writing instrument with a rod-shaped body feeding device, which is provided with an operation button slidably in a longitudinal direction in a sliding groove of a rear shaft, and is engaged with each other in a writing instrument with a rod-shaped body feeding device for feeding a rod-shaped body. At least one of the contact surfaces of the front shaft and the rear shaft is configured to be inclined in the longitudinal direction, and when the rear shaft is rotated, the other contact surface is contacted along the inclined one contact surface. A writing instrument with a rod-shaped body feeding device, wherein the front surface and the rear shaft are disengaged by the surface sliding and the rear shaft retracting as the contact surface slides. 2. The front shaft and the rear shaft are formed with a projection on one side and a recess is formed on the other side, and the projection and the recess are engaged with each other to connect the front shaft and the rear shaft. Writing instrument with a rod-shaped body feeding device. 3. The writing instrument with a rod-shaped body feeding device according to claim 2, wherein the protrusion is coated with a lubricant such as silicon oil. 4. The writing instrument with a rod-shaped body feeding device according to claim 2 or 3, wherein a lubricant such as silicon oil is applied to the concave portion.