JPH0556493U - Rotation-bar stop mechanism for the feeding unit - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a rotation stopping mechanism that can extremely easily attach / detach a rotary rod-shaped object feeding unit to / from a knock-type writing instrument, and can easily refill a core and replace a refill. .. [Structure] An outer surface of a base portion 5A of a rotary rod-shaped object feeding unit 1 is detachably fitted to an inner surface of a rear end portion 2 of a writing shaft constituting a knock-type writing instrument so that a head 3A projects from an outer cylinder 4. Then, the rotation rod-shaped object feeding unit 1 is fitted into the outer cylinder 4 so as not to rotate but axially movable.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a rotation stopping mechanism of a rotary rod-shaped object feeding unit for a knock-type writing instrument.

[0002]

[Prior Art]

 As a conventional knock-type writing instrument of this type, there is one described in Japanese Utility Model Publication No. 57-132598. This knock-type writing instrument has a mechanical pencil body in which a rotating upper part having a spiral groove inside and a lower part having a vertical groove are pivotally attached, a core tube having a notch and a convex part fitted in the vertical groove, and a notch of the core tube. And a rubber eraser receiver having a protrusion that engages with the spiral groove, and the rod-shaped rubber eraser can be retracted and retracted by rotating the rotating upper part.

[0003]

[Problems to be solved by the device]

 Since the rotation stop mechanism of the rotating rod-shaped object eraser feeding device (including the rotating upper part, the core tube and the eraser receiver) for the above-mentioned knock-type writing instrument is an engaging structure between the lower vertical groove and the convex part of the core tube, It is not easy to remove the rotating rod eraser feeding device from the writing instrument, and it is not easy to handle the feeding device as a unit, and the core cannot be replenished without removing the eraser receiver. There is a problem of being inferior.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the mechanism of the present invention rotates the head 3A so that the head 3A projects from the outer cylinder 4 on the inner surface of the rear end 2 of the writing shaft that constitutes the knocking writing tool, as shown in FIG. The outer surface of the base portion 5A of the rod-shaped material feeding unit 1 is detachably fitted and locked, and the rotary rod-shaped material feeding unit 1 is fitted to the outer cylinder 4 so as not to rotate but axially movable.

[0005]

When the head 3A of the rotary rod-shaped object feeding unit 1 is rotated with respect to the outer cylinder 4, the rod-shaped object 7 appears and disappears from the head 3A according to the rotation direction. When the head 3A of the unit for feeding the rotary rod-shaped object 1 is knocked, the tip of the writing shaft projects from the tip of the outer cylinder 4 and is in a projecting state, and is knocked again to be retracted.

[0006]

【Example】

 FIG. 1 is a sectional view of a first embodiment of the mechanism of the present invention. In FIG. 1, 2 is a rear end portion of a writing shaft constituting a knock-type mechanical pencil, a core tank, and 4 is an outer cylinder thereof. The writing shaft is, for example, as well known in the art, inserted into the outer cylinder 4, received by the tip tool, and screwed to the outer cylinder. By knocking the lead tank 2, the chuck fitted with the chuck ring is chucked. After opening the slider tip pipe from the tip of the outer cylinder against the elastic force of the tightening elastic body or by opening and closing with the elastic force, the writing core is extended by a specified length and retracted by pushing the core tip in the knocked state. It is configured to be able to.

The outer surface of the base portion 5A of the rotary rod-shaped object feeding unit 1 is detachably fitted to the inner surface of the large diameter portion of the core tank 2 so that the head portion 3A projects from the outer cylinder 4, and the base portion 5A is attached to the shoulder portion 2A. While being locked, between the outer surface of the base portion 5A of the rotary rod-shaped object feeding unit 1 and the inner surface of the large diameter portion of the core tank 2 of the writing shaft, and between the outer surface of the large diameter portion of the core tank 2 of the writing shaft and the outer cylinder 4. The inner surfaces are fitted together such that they cannot rotate but can move in the axial direction.

As a structure which is non-rotatable and is movable in the axial direction, for example, as shown in the figure, a fitting structure with polygonal outer surfaces 5a, 2a and polygonal inner surfaces 2b, 4b or a fitting with a key and a key groove is used. A structure etc. can be mentioned.

In the rotary rod-shaped object feeding unit 1, a spiral groove 8 is provided on the inner surface of a tubular body 3, and an inner shaft 5 provided with a guide groove 9 is inserted into the tubular body 3 to lock the tip stopper portion 5B and the rear portion. A rod-shaped object holder 11 is provided, which is locked by the piece 5C, and the protrusion 10 is engaged with the guide groove 9 and the spiral groove 8 in the inner shaft 5. As the rod-shaped object 7, an eraser, a color core, a correction rod, and other rod-shaped objects can be applied.

FIG. 2 is a sectional view of the second embodiment. This second embodiment is similar to the first embodiment of FIG. 1 except that the lead tank 2 has the same diameter and the rear end of the lead tank 2 has a tapered surface 2B so that the lead can be easily replenished and tapered. This is an example in which the base portion 5A of the rotary rod-shaped object feeding unit 1, that is, the rear portion locking piece 5C of the center shaft 5 is locked to the surface 2B.

FIG. 3 is a sectional view of the third embodiment. In the third embodiment, the rear end of the lead tank 2 is made to be a tapered surface 2B to facilitate the refilling of the lead, and the tapered surface 2B is provided with the outer step portion 5b of the base portion 5A of the rotary rod-like material feeding unit 1. This is a case where they are locked and fitted between the outer surface of the base portion 5A and the inner surface of the outer cylinder 4 such that they cannot rotate but can move in the axial direction.

FIG. 4 is a sectional view of the fourth embodiment. In the fourth embodiment, the outer surface of the base portion 5A of the rotary rod-shaped object feeding unit 1 and the inner surface of the outer cylinder 4 are fitted so as to be non-rotatable and axially movable, and the tapered surface 2B is fitted to the first outer step of the base portion 5A. When the portion 5b is locked and the head portion 3A is knocked, the second outer step portion 5c of the base portion 5A abuts on the inner surface of the outer cylinder 4 to limit the knocking margin A. It

FIG. 5 is a sectional view of the fifth embodiment. In the fifth embodiment, the small diameter portion of the receiving cylinder 6 is fitted on the outer surface of the core tank 2, and the inner surface of the large diameter portion of the receiving cylinder 6 and the outer surface of the base portion 5A of the rotary rod-shaped material feeding unit 1 and the receiving cylinder 6 are fitted. This is an example in which the outer surface of the large-diameter portion and the inner surface of the outer cylinder 4 are fitted so as not to be rotatable and axially movable. Reference numerals 6a and 6b denote a polygonal outer surface that fits with the polygonal inner surface 4b of the outer cylinder 4 and a polygonal inner surface that fits with the polygonal outer surface 5a of the base portion 5A.

FIG. 6 is a sectional view of the sixth embodiment. The sixth embodiment is an example in which the receiving cylinder 6 has the same diameter in the fifth embodiment of FIG.

The present invention can also be applied to a knock type ballpoint pen. In the case of a ball-point pen, the writing shaft is a refill, and as is well known, it is inserted in the outer cylinder 4 by being biased rearward by the elastic force of the elastic body, and is engaged with the cam bar by knocking the cylinder part of the cam bar. The mating rotor and the refill fitted to it are moved forward or backward by the elastic force of the elastic body or the elastic force of the elastic body causes the rotary cam to rotate by a predetermined angle to the cam of the main body provided in the outer cylinder. It is configured to be locked or unlocked so that the pen tip of the refill can be retracted from the tip of the outer cylinder.

The refill of such a knock type ball-point pen is replaced with the writing shaft of the knock type mechanical pencil according to the first to second embodiments of FIGS. 1 to 6, and the lead tank 2 is used as the cylinder portion of the cam bar. Can be applied in exactly the same way.

When the head portion 3A of the rotary rod-shaped object feeding unit 1 is rotated with respect to the outer cylinder 4, the rod-shaped object 7 is projected and retracted from the head portion 3 according to the rotation direction. Further, when the head 3A of the rotary rod-shaped product feeding unit 1 is knocked, the tip of the writing shaft projects from the tip of the outer cylinder 4 and is in a projecting state, and it is retracted by knocking again.

When replenishing the core, the rotary rod-shaped material feeding unit 1 can be withdrawn from the core tank 2 or the receiving cylinder 6, and the core can be replenished to the core tank 2 directly or via the receiving cylinder 6. When replacing the refill, the tip tool can be removed from the outer cylinder 4, and the refill can be taken out and replaced.

[0019]

As described above, according to the present invention, the rotary rod-shaped object feeding unit 1 is provided on the inner surface of the rear end portion 2 of the writing shaft constituting the knock-type writing instrument so that the head 3A projects from the outer cylinder 4. Since the outer surface of the base 5A is detachably fitted and locked, and the rotary rod-shaped product feeding unit 1 is fitted in the outer cylinder 4 so as to be non-rotatable and axially movable, the rotary rod-shaped product can be attached to the knock-type writing instrument. The delivery unit can be mounted or withdrawn very easily, the core can be refilled and the refills can be easily replaced, and it has an effect of excellent convenience.

[Brief description of drawings]

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

FIG. 2 is a sectional view of a second embodiment.

FIG. 3 is a sectional view of a third embodiment.

FIG. 4 is a sectional view of a fourth embodiment.

FIG. 5 is a sectional view of a fifth embodiment.

FIG. 6 is a sectional view of a sixth embodiment.

[Explanation of symbols]

 1 Rotary Rod Feeding Unit 2 Rear End (Core Tank) 2A Shoulder 2a (Polygon) Outer Surface 2b (Polygon) Inner Surface 3 Cylindrical Body 3A Head 4 Outer Tube 4A Projection 4b (Polygonal) Inner Surface 5 Center Axis 5A Base portion 5B Tip stopper portion 5C Rear locking piece 5a (Polygonal) outer surface 5b (First) outer step portion 5c (Second) outer step portion 6 Receiving tube 6a (Polygonal) outer surface 6b (Polygonal) inner surface 7 Rod shape Object 8 Spiral groove 9 Guide groove 10 Protrusion 11 Bar-shaped object holder

Claims (4)

[Scope of utility model registration request] 1. A base portion of a rotary rod-shaped object feeding unit (1) so that a head portion (3A) projects from an outer cylinder (4) on an inner surface of a rear end portion (2) of a writing shaft body constituting a knock-type writing instrument. (5
A) A rotating rod-shaped object feeding unit in which the outer surface is detachably fitted and locked, and the rotating rod-shaped object feeding unit (1) is fitted to the outer cylinder (4) so as to be non-rotatably and axially movable. Stop mechanism. 2. An outer cylinder between the outer surface of the base (5) of the rotary rod feeding unit (1) and the inner surface of the rear end (2) of the writing shaft, and the outer surface of the rear end (2) of the writing shaft and the outer cylinder. The rotation preventing mechanism for a rotary rod-shaped article feeding unit according to claim 1, wherein the inner surfaces of (4) are fitted in such a manner that they cannot rotate but are movable in the axial direction. 3. The rotating rod-shaped object according to claim 1, wherein the outer surface of the base portion (5A) of the rotating rod-shaped object feeding unit (1) and the inner surface of the outer cylinder (4) are fitted so as to be non-rotatable and axially movable. Detent mechanism for the feeding unit. 4. A receiving cylinder (6) is fixed to the outer surface of the rear end portion (2) of the writing shaft, and the inner surface of the receiving cylinder (6) and the base portion (5A) of the rotary rod-shaped material feeding unit (1) are fixed. 2. The rotation stopping mechanism for a rotary rod-shaped product feeding unit according to claim 1, wherein the rotation preventing mechanism is fitted between the outer surfaces and between the outer surface of the receiving cylinder (6) and the inner surface of the outer cylinder (4) so as to be non-rotatable and axially movable.