JPH08108687A - Device for feeding rotational type rod-like member - Google Patents

Abstract

PURPOSE: To make a rod-like member rise and set with a cap being slidably moved with respect to a leading shaft by making the rear end of the rod-like member set through the rear end of a top cap part when the rod-like member is locked at an advancing position by moving forward the cap from a retreating position suitably projected from the rear end of the top cap part. CONSTITUTION: A stopper ring 17 is fitted into a shaft part 14 of an inner cylinder 9, then inserted into an inner hole from the top of a cap 4 and fixed to a window 7 of the cap by being engaged elastically with an engaging projection 18. Further, the inner cylinder 9 has an engaging protrusion 20 to be locked with a groove 12 in such a condition that a step 13 of the inner cylinder 9 abuts against an inner step 21. A rod-like member 25 is stopped at and fixed to a holding part 24 of a holder 22, and the shaft part 14 of the inner cylinder is rotatively stopped at a rear end hole of a leading shaft 1 and further disengageably engaged with an engaging groove 16 provided in an inner hole of the forward part of the shaft part 14 in an engaging protrusion 3 of a lead case 2. The locking force is set suitably stronger than that between the stopper ring 17 and the inner cylinder 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a rotary bar-shaped body feeding device which is arranged at the rear end of a writing instrument and which is adapted to feed out a bar-shaped body such as an eraser or a solid correction agent.

[0002]

2. Description of the Related Art Conventionally, there has been known a mechanical pencil in which a cap is rotated with respect to a front shaft to feed a large-diameter eraser from a rear end, and a rear end is knocked with respect to the front shaft to feed a core. However, since this product knocks the rear end as the core is consumed, when writing or erasing frequently, there is the trouble of accommodating the protruding eraser in the cap when knocking. (If you knock in the protruding state, your fingers may become dirty, or the oil on your fingers may transfer to the end surface of the eraser, resulting in poor erasability.)

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems of the prior art, and a writing instrument having a mechanical pencil at the tip of a barrel, and a plurality of writing instruments such as a mechanical pencil and a ballpoint pen on the barrel. The object of the present invention is to improve a rotary rod-shaped body feeding device arranged at the rear end of a so-called compound writing instrument having a body.

[0004]

SUMMARY OF THE INVENTION A rotary rod-shaped body feeding device of the present invention devised to achieve the above object is a rod-shaped body provided with a writing portion on the front side and connected to the rear end of a barrel. A feeding device, in which an inner cylinder having a slit portion at the rear and a crown portion at the rear end and a shaft portion at the front is mounted in the inner hole of a cap having a spiral groove in the inner hole, The cap is rotatably and axially movable within an appropriate range.A holder having a rod-shaped body fixed to the inner cylinder is movable back and forth, and the protrusions provided on the side surfaces are fitted into the slit and the spiral groove, respectively. A front inner hole of the cap in which the rod-shaped body can be retracted from the rear end of the crown when the shaft part of the cylinder is integrally joined to the shaft cylinder side in the rotation direction and the cap is rotated with respect to the shaft cylinder. A stopper ring with a locking part is fixed to the front of the slit part of the inner cylinder Locking parts are provided at two locations on the outer circumference of the part, and the caps can be locked in the retracted position with respect to the inner cylinder by mutual locking, and the rod-shaped body is appropriately retracted from the rear end of the crown portion in the retracted position. When the cap is moved forward and locked at the forward position, the rear end of the rod-shaped body is configured to be recessed from the rear end of the crown portion.

[0005]

1 and 2 show an embodiment of the present invention. First, the rotary rod-shaped body feeding device is configured by combining the members of the cap 4, the inner cylinder 9, and the holder 22, and the cap 4 is formed on the one side with the inner hole fitted to the outer periphery of the rear end of the front shaft 1 in the forward direction. A perforated window portion 7 and a step portion 6 are formed, a clip 8 is provided on the outer peripheral portion, and a spiral groove 5 is formed on the rear inner hole surface. Further, the inner cylinder 9 has a crown portion 10 that abuts the rear end surface of the cap 4 at the rear end together with a hole portion through which the rod-shaped body 25 is inserted, and a long slit portion 11 is bored from approximately the center toward the crown portion. Has been done. Further, in the front, there is provided a shaft portion 14 which is integrally engaged with a rear end hole of the front shaft 1 in a rotational direction, and an inner hole of the shaft portion 14 is appropriately engaged with the lead case 2 of the mechanical pencil. A groove 16 is provided, and further, a partition portion 15 that comes into contact with the rear end of the core case 2 is provided. Further, a step portion 13 is formed on the rear outer periphery of the shaft portion 14, and a circumferential groove 12 is formed further rearward. Further, the holder 22 is provided with a holding portion 24 having a bottomed hole portion for fixing the rear end of the rod-shaped body 25 to the rear end and a protrusion 23 on the outer peripheral portion of the rear end.

The holder 22 is elastically fitted from the slit portion 11 of the inner cylinder 9 so that the projection 23 is fitted in the slit portion and the inner cylinder 9 is projected from the rear end of the cap 4 to the projection 2.
3 is inserted while being inserted into the spiral groove 5.

On the other hand, the stopper ring 17 has an engaging protrusion 18 on the front side of the outer peripheral surface thereof, and an elastic piece 19 which is displaceable in the expanding direction is provided on the rear side thereof by appropriately providing a slit or the like (not shown). An engaging protrusion 20 is formed inside the elastic piece. An inner step portion 21 is formed behind the elastic piece 19.

The stopper ring 17 is a shaft portion 14 of the inner cylinder 9.
Then, the cap 4 is fitted into the inner hole from the front side of the cap 4, and the engaging projection 18 is elastically locked and fixed to the window portion 7 of the cap. Further, the inner cylinder 9 has the step portion 13 with the inner step portion 2
The engaging projection 20 is locked in the groove 12 in the state of being in contact with 1. or,
The rod-shaped body 25 is fixed to the holding portion 24 of the holder 22, and the shaft portion 14 of the inner cylinder is prevented from rotating in the rear end hole of the front shaft 1.
Further, the engaging projection 3 of the lead case 2 engages with an engaging groove 16 provided in the inner hole of the shaft portion 14 in a disengageable state. The locking force is appropriately set to be stronger than the locking force between the stopper ring 17 and the inner cylinder 9.

By the way, in the embodiment, the engaging portion is provided between the shaft portion 14 and the lead case 2. However, if the engaging force is too strong, the cap is pulled out when the lead is inserted. There is a problem that the strong gripping force of the chuck hangs on the core and the core is broken. As a countermeasure against this, the shaft portion 14 and the core case 2 are engaged with each other within a range in which there is no problem (for example, normal frictional engagement without provision of protrusion engagement), and the shaft portion is retracted when the cap 4 is retracted. It is also possible to provide an engaging portion for preventing the stopper 14 from coming off and between the outer peripheral portion of the shaft portion 14 and the inner peripheral portion of the front shaft 1.

By the way, a writing element of a mechanical pencil is provided in front of the tip shaft 1 so as to extend the lead in conjunction with the forward and backward movement of the lead case 2. The structure is not the gist of the present invention, so the description thereof is omitted.
Further, the rotary rod feeding device of the present invention stores a plurality of mechanical pencils and ball pens in a ball-point pen or a barrel in which the writing tip is retracted from the tip by a knock at the rear end, and selectively writes each writing body. It is also applied to a so-called compound writing instrument in which the tip of the can be retracted from the shaft tip. Further, an eraser or a solid correction agent capable of erasing the ball-point pen ink is applied to the rod-shaped body.

[0011]

First, when the cap 4 is rotated left and right with respect to the front shaft 1 in the state shown in FIG. As shown in FIG. 1, when the cap 4 is slid forward with respect to the tip shaft 1 in a state where the rod 25 is appropriately projected, the engagement protrusion 20 of the stopper ring 17 and the groove 12 of the inner cylinder 9 are engaged. When the step portion 13 disengages and engages with the engaging projection 20, the rear end of the rod-shaped body 25 is recessed in the rear end hole of the crown portion 10, as shown in FIG. If the rear end of the crown 10 is knocked in this state, the core can be extended.

[0012]

The configuration and operation of the rotary rod-shaped body feeding device of the present invention are as described above, and an appropriate amount of rod-shaped bodies can be projected and retracted only by sliding the cap with respect to the tip shaft. When writing or erasing frequently, the troublesomeness of rotating the cap with respect to the tip shaft each time is eliminated.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part showing a rotary type rod feeding device according to an embodiment of the present invention, in which a cap is positioned rearward and a certain amount of rod is projected.

FIG. 2 is a vertical cross-sectional view of a main part showing a state in which a rod-shaped body is retracted with the cap positioned forward.

[Explanation of symbols]

 1 Tip Shaft 2 Core Case 3 Engagement Protrusion 4 Cap 5 Spiral Groove 6 Step 7 Window 8 Clip 9 Inner Cylinder 10 Crown Crown 11 Slit 12 Groove 13 Step 14 Shaft 15 Partition 16 Engagement Groove 17 Stopper Ring 18 Engagement protrusion 19 Elastic piece 20 Engagement protrusion 21 Inner step 22 Holder 23 Protrusion 24 Clamping portion 25 Rod-shaped body

Claims (3)

[Claims] 1. A rotary rod-shaped body feeding device having a writing portion on the front side and connected to a rear end of a barrel, the rod-shaped body feeding device being an inner hole of a cap having a spiral groove in the inner hole. An inner cylinder having a slit portion at the rear and a crown portion at the rear end, and a shaft portion at the front is attached to the inner cylinder, and the cap is rotatable with respect to the inner cylinder and movable in the axial direction within an appropriate range, A holder having a rod-shaped body fixed to the inner hole of the inner cylinder can be moved back and forth. A stopper ring having a locking portion in the front inner hole of the cap, wherein the rod-like body can be retracted from the rear end of the crown when the cap is rotated with respect to the shaft cylinder. Is fixed, and two engaging parts are provided on the outer circumference of the front shaft part of the slit part of the inner cylinder. It is provided so that the cap can be locked in the forward / backward position with respect to the inner cylinder by mutual locking, and the rod-like body moves the cap forward from the retracted position where it appropriately protrudes from the rear end of the crown, and the forward position. A rotating rod-shaped body feeding device, characterized in that the rear end of the rod-shaped body is retracted from the rear end of the crown portion when it is locked to the. 2. An elastic piece capable of expanding behind the stopper ring, an engaging projection provided inside the elastic piece, and a circumferential groove or step on the outer periphery of the front shaft of the inner cylinder. 2. The rotary type according to claim 1, wherein the two engaging portions formed by the above are provided, and the engaging protrusions can be engaged with and disengaged from the two engaging portions respectively. Rod-shaped body feeding device. 3. A writing instrument of a mechanical pencil is provided at the tip, and a locking portion for engaging and disengaging the shaft front portion of the inner cylinder and the core case is provided, and the locking force is the stopper ring and the inner cylinder. The rotary rod-shaped body feeding device according to claim 1, wherein the rotation-type rod-shaped body feeding device is provided with a strength stronger than the locking force with respect to.