JPH07237394A - Rotary letting-out type writing utensile - Google Patents

Abstract

PURPOSE:To prevent constitutional parts from breaking due to over-torque applied at the rotary operation of a cap cylinder. CONSTITUTION:In a rotary letting-out type writing utensile, which is formed by rotatably assembling a rotary cam tube 16 having oblique cam surfaces at its end in the inside of a fixed guide tube 9 having axial keyways, assembling a sliding presser 20 having keys engaging with the keyways and the tips of keys slidingly contacting with the cam surfaces in the rotary cam tube and combining a driving coupling tube 23 coveringly fitted on the fixed guide tube with the rear end of the rotary cam tube, a fixed stopper 14 is formed on the outer peripheral surface of the fixed guide tube, while a rotary stopper 28 is protrusively provided on the inner peripheral surface at the opening end of the driving coupling tube so as to abut the rotary stopper against one of the stopping surfaces of the fixed stopper at the maximum advanced state of the refill, while the rotary stopper abuts against the other stopping surface of the fixed stopper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary feeding type writing instrument, and more particularly to a rotary feeding type in which a sliding pusher is advanced in the axial direction to push a refill into a writable state as the rotary cam barrel rotates. About writing instruments.

[0002]

2. Description of the Related Art In general, a rotary feeding type writing instrument is known as a writing instrument for feeding a refill such as a ballpoint pen out of a barrel by rotating a cap barrel. In this, the rotary cam cylinder is rotated integrally with the cap barrel, the sliding pusher is advanced using the end face cam, and the tip of the refill is projected from the mouthpiece of the shaft barrel for writing. See Kaihei 3rd Edition No. 36488).

[0003]

However, in the above-described conventional rotary feeding type writing instrument, there is a possibility that a large rotational force acts on the cap barrel during the refill feeding operation to damage the components such as the rotary cam barrel. Therefore, an object of the present invention is to solve the problems of the above-mentioned conventional techniques, and to provide a rotary feeding type writing instrument in which a large rotational force does not act upon the rotational movement of the cap barrel to damage the components.

[0004]

In order to achieve the above object, a rotary feeding type writing instrument of the present invention comprises a fixed guide tube having an axial key groove and an end surface rotatably incorporated inside the fixed guide tube. A rotating cam barrel having an oblique cam surface,
A key that is incorporated in the rotary cam barrel and that engages with the key groove is provided on the outer peripheral surface, and the tip of the key is slidably in contact with the cam face and is connected to the rear end portion of the rotary cam barrel. In the rotary feeding type writing instrument comprising a drive coupler cylinder fitted in the fixed guide cylinder, a fixed stopper is formed on the outer peripheral surface of the fixed guide cylinder, while the inner peripheral surface of the opening end of the drive coupler cylinder is formed. A rotation stopper is provided on the upper side so that the rotation stopper contacts one stop surface of the fixed stopper when the refill is in the maximum forward state, and the rotation stopper contacts the other stop surface of the fixed stopper when the refill is in the maximum retracted state. It is characterized by having done.

[0005]

According to the present invention, when the rotary push-out type writing instrument is not used, the cap cylinder is rotated from the state where the sliding pusher is at the most retracted position by the spring force of the return spring,
The drive coupler cylinder rotates, and the rotary cam cylinder integrated with the drive coupler cylinder rotates. The cam surface of the rotary cam cylinder moves the sliding pusher axially forward, overcomes the spring force of the return spring to advance the refill, and causes the tip of the ball to project from the mouthpiece to enable writing. In this state, the rotation stopper of the drive coupler cylinder abuts on the stop surface of the fixed stopper of the fixed guide cylinder, and an excessive rotational force is prevented from acting on the rotation cam cylinder and the sliding presser.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a rotary feeding type writing instrument according to the present invention will be described below with reference to the drawings. FIG. 1 shows an example in which the present invention is applied to a rotary feeding type ball pen. In the drawings, reference numeral 1 indicates a barrel, and a base 3 is screwed to a tip of the barrel 1 via a connecting pipe 2. A refill 4 of a ballpoint pen is incorporated inside the barrel 1 with a ball tip 5 first, and a return spring 6 is mounted near the tip of the refill 4.

An adapter ring 8 is screwed to the rear end of the body tube 1 via a connecting tube 7, and a fixed guide tube 9 is screwed to the opposite side thereof. This fixed guide tube 9
As is clear from FIGS. 3 to 5, the two guide holes 10 and 11 having different diameters are provided on the inner side, and a keyway 12 in the axial direction is formed in a part of the cylindrical wall, and An opening 13 is formed in the hole. A fixed stopper 14 is formed on the outer peripheral surface of the fixed guide tube 9, and the fixed stopper 14 sandwiches the key groove 12 so as to sandwich the pair of stop surfaces 1.
5a and 15b.

Returning to FIG. 1, reference numeral 16 denotes a rotary cam barrel, the main part of which is rotatably fitted in the guide hole 11 of the fixed guide barrel 9, and the rear shaft 17 is provided.
Protrudes rearward from the opening 13. As shown in FIG. 6, an oblique cam surface 18 is formed on the front end surface of the rotary cam barrel 16, and a bearing hole 19 is formed inside. A sliding pusher 20 is incorporated in the bearing hole 19, and the sliding pusher 20 has an axial key 21 on the outer peripheral surface. The key 21 is engaged with the key groove 12 of the fixed guide tube 9 described above, and as a result, the sliding pusher 20 is allowed to move in the axial direction within the rotary cam cylinder 16, but is not rotated. Movement in the direction is restricted.

Further, on the rear shaft 17 of the rotary cam barrel 16,
The drive coupler cylinder 23 is connected via a pin 27.
Between the rear end surface of the fixed guide tube 9 and the drive coupler tube 23,
Washer 24, washer 25 and coil spring 2
6 are sequentially incorporated, and the rotary cam barrel 16 is pulled rearward by the spring force of the coil spring 26. The drive coupler cylinder 23 is fitted on the outer side of the fixed guide cylinder 9, and its end ends slightly ahead of the rotary cam cylinder 16, and a rotation stopper 28 is projected on a part of the inner peripheral surface thereof. Has been done. On the other hand, a male screw portion 29 is formed at the rear end of the drive coupler cylinder 23, and a tail plug 31 is attached so as to sandwich the cap body 30.

Since the rotary feeding type ball-point pen according to the present invention is constructed as described above, when the refill 4 is stored,
As shown by the solid line in FIG. 1, when the cap barrel 30 is rotated counterclockwise, the drive coupler cylinder 23 and the rotary cam cylinder 16 are integrally rotated counterclockwise accordingly. The refill 4 spring-loaded by the return spring 6 pushes the sliding pusher 20 inward by the action of the spring force, and the tip of the key 21 falls to the lowest position along the cam surface 18 of the rotary cam barrel 16, Stop at this position.
At this time, the rotation stopper 28A of the drive coupler cylinder 23 is in contact with the stop surface 15a of the fixed stopper 14 of the fixed guide cylinder 9 as shown by the phantom line in FIG.

On the other hand, when the refill 4 of this ballpoint pen is projected and is written, the cap barrel 30 is rotated clockwise and, as shown by the phantom line in FIG.
The rotation stopper 28B of No. 3 is rotated until it comes into contact with the stop surface 15b of the fixed stopper 14 of the fixed guide tube 9. Then, the key 21 of the sliding pusher 20 advances along the cam surface 18, and accordingly, the refill 4 advances while compressing the return spring 6, and the ball tip 5 projects from the mouthpiece 3 for writing. It becomes a state. Even if an excessive rotational force acts on the cap cap barrel 30 from this state, the fixed stopper 14 receives the force from the rotation stopper 28, so that the other portions are prevented from being rotated and damage is prevented. Although the present invention is applied to the rotary feeding type ball-point pen in the above-mentioned embodiment, the present invention is not limited to this and can be applied to a ball-type water-based pen and other writing instruments.

[0012]

As is apparent from the above description, according to the present invention, the rotation stopper is provided on the inner peripheral surface of the drive coupler cylinder that rotates integrally with the cap barrel, and the outer peripheral surface of the fixed guide cylinder is provided. Since it engages with the stop surface of the upper fixed stopper at each position, the components such as the rotating cam barrel and sliding pusher are damaged even when a large rotational force acts on the cap barrel during operation. Can be reliably prevented from being damaged or damaged.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a rotary feeding type ballpoint pen according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing an enlarged main part of the embodiment.

FIG. 3 is a vertical sectional view showing a fixed guide tube.

FIG. 4 is a plan view showing the fixed guide tube.

5 is a cross-sectional view taken along the line EE of FIG.

FIG. 6 is a layout view in which a refill, a sliding pressing member, a rotating cam cylinder, and a fixed guide cylinder are arranged in a straight line.

FIG. 7 is a vertical cross-sectional view showing a drive coupler cylinder.

FIG. 8 is an end view seen from the front of the drive coupler cylinder.

[Explanation of symbols]

 4 Refill 9 Fixed Guide Tube 14 Fixed Stopper 16 Rotating Cam Tube 18 Cam Surface 20 Sliding Pusher 23 Drive Coupler Tube 28 Rotation Stopper

Claims (2)

[Claims] 1. A fixed guide cylinder having an axial key groove, a rotary cam cylinder rotatably mounted inside the fixed guide cylinder and having an inclined cam surface on an end face, and a rotary cam cylinder incorporated in the rotary cam cylinder. A sliding presser having a key engaging with the key groove on an outer peripheral surface, the tip of the key slidingly contacting the cam surface;
In a rotary feeding type writing instrument comprising a drive coupler tube fitted to the fixed guide tube and connected to a rear end portion of the rotary cam tube, a fixed stopper is formed on an outer peripheral surface of the fixed guide tube while the fixed stopper is formed. A rotation stopper is provided on the inner peripheral surface of the open end of the drive coupler cylinder, and the rotation stopper contacts one stop surface of the fixed stopper when the refill is in the maximum forward state, and the rotation stopper stops when the refill is in the maximum retracted state. A rotary feeding type writing instrument characterized in that it comes into contact with the other stop surface of the. 2. The rotary feeding type writing instrument according to claim 1, wherein the fixed stoppers are provided on both sides of the fixed guide tube with a key groove interposed therebetween.