JP2555673Y2 - Rotating writing instrument - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a revolving type writing instrument in which a pen body is protruded and retracted from a front shaft tip opening when a rear shaft is rotated with respect to a front shaft.

[0002]

2. Description of the Related Art In the above-mentioned rotary feeding writing instrument, a driving member is disposed in a rear shaft. When the rear shaft is rotated with respect to the front shaft, the driving member fixed to the rear shaft rotates the refill holder. Let it. An actuator that projects radially from the refill holder is engaged with the spiral cam groove, and when the refill holder rotates, it moves back and forth simultaneously by the cam action, and the pen body at the tip of the refill held by the refill holder is moved. It protrudes and retracts from the opening at the tip of the front shaft.

As described above, since a large torque is applied to the driving member at the time of feeding, it is necessary to securely fix the driving member to the rear shaft to prevent idling. Conventionally, in order to fix the driving member to the rear shaft, the driving member is fixed by, for example, caulking or bonding.

[0004]

However, when fixed by swaging with a punch, the work is simple, but swaging marks are formed on the rear shaft. This swaging mark is formed at a position hidden by the clip, but the swaging mark is still visible depending on the viewing angle, which is not preferable in appearance. Further, in the method of bonding with an adhesive, handling of the adhesive is complicated, and the adhesive force may deteriorate due to aging and run idle.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotary dispensing writing instrument which can securely fix a driving member to a rear shaft with a simple structure and does not run idle even when a large torque is applied during dispensing.

[0006]

In order to achieve the above object, a rotary-extending writing instrument according to the present invention is arranged such that when a rear shaft is rotated with respect to a front shaft, a driving member disposed in the rear shaft is a refill holder. Is moved back and forth while rotating, and the pen body at the tip of the refill held by the refill holder protrudes and retracts from the front shaft tip opening. In cooperation with the fixing screw, the annular mounting portion also serves as a fixing nut for clamping and holding the rear shaft . The two concave portions and the concave portion, which are opposed to the tail end edge of the driving member and the mounting portion of the clip, are provided. the same
Two protruding portions are formed so as to face each other, and the concave portions and the protruding portions are engaged with each other.

[0007]

First, the clip does not idle with respect to the rear shaft because the mounting portion is inserted through the window hole of the rear shaft. Then, the driving member also serves as a fixing nut for fixing the clip, and at the tail edge of the driving member and the mounting portion of the clip ,
Two recesses arranged oppositely and also arranged oppositely
Since the two concave and convex portions are formed and engaged with each other, the driving member can be securely fixed to the rear shaft with a simple structure,
It does not run idle even when a large torque is applied.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the embodiments shown in the drawings. FIG. 1 shows a ball-point pen of a rotary feeding type, in which a rear shaft 1 and a front shaft 2 made of a thin metal pipe are connected to each other so as to be rotatable. A lid plug 11 is attached to the tail end of one. The cam 71 and the cam chassis 72 are non-rotatably connected by a projection 75 provided on the outer periphery of the cam 71, and the cam 71 and the cam chassis 72 form a spiral cam groove 73. And the cam chassis 72 is a threaded joint 77
With screw joint 77 fixed to front shaft 2
Screwed to 7. That is, the cam 71 and the cam chassis 72 forming the cam groove 73 are detachably fixed to the front shaft 2, and these components do not rotate even if the rear shaft 1 rotates with respect to the front shaft 2.

[0009] Tip hole of drive member 4 arranged in rear shaft 1
42 is press-fitted with a drive pin 8 having a polygonal cross section.
The distal end of the drive pin 8 is fitted into the tail end hole 63 of the refill holder 6, which also has a polygonal inner surface. That is, when the driving member 4 rotates, the refill holder 6 also rotates, but the refill holder 6 is connected so as to be movable in the axial direction. An operator 61 provided on the outer periphery of the refill holder 6 is engaged with the spiral cam groove 73, and when the refill holder 6 rotates, it moves back and forth simultaneously by the cam action. The refill 9 of a ball-point pen is fitted and held in the pipe portion 62 at the tip of the refill holder 6.
Haunt from 1

A cam joint 74 fixed to the driving member 4 is rotatably connected to the cam 71, and an O-ring 76 is interposed between the leading edge of the driving member 4 and the tail edge of the cam 71. I have. Accordingly, when the rear shaft 1 is rotated with respect to the front shaft 2, the connection between the cam joint 74 and the cam 71 and the cam 71
The contact between the tail edge of the O-ring 76 and the O-ring 76 slides, and this sliding resistance gives an appropriate rotation resistance.

An annular mounting portion 31 is formed at the tail end of the clip 3, and is disposed in the rear shaft 1 in a state of being fitted into a window hole of the rear shaft 1. Therefore, the clip 3 does not rotate with respect to the rear shaft 1. A fixing screw 5 having a tip portion inserted into the mounting portion 31 is screwed to the driving member 4,
The mounting portion 31 is pressed by the fixing screw 5 and the driving member 4, and the clip 3 is fixed to the rear shaft 1. That is, the driving member 4
Also serves as a fixing nut.

Here, as shown in FIGS. 2A and 2B, two mounting portions 32 are provided on the mounting portion 31 of the clip 3.
Are formed facing each other at an interval of 180 °.
As shown in FIGS. 3 (A) and 3 (B), two concave portions 41 are also formed at the tail edge of the rear end at an interval of 180 [deg .]. The projection 32 and the recess 41 are engaged. Note that a concave portion may be formed in the attachment portion 31 and a convex portion may be formed in the tail edge of the driving member 4.

When the rear shaft 1 is rotated with respect to the front shaft 2, the driving member 4 fixed to the rear shaft 1 rotates the refill holder 6, and as described above, the pen body 91 is moved to the front end.
Drive member 4 that appears and disappears from 21 but also serves as a fixing nut
Since the two concave portions 41 and the convex portions 32 formed opposite to the mounting portion 31 of the clip 3 are engaged with each other, the torque is reliably transmitted to the driving member 4 via the clip 3. The driving member 4 does not idle with respect to the rear shaft 1.

[0014]

[Effects of the Invention] As described above, according to the present invention,
With a simple structure, the driving member can be securely fixed to the rear shaft, and a rotary-feeding writing instrument that does not run idle even when a large torque is applied during feeding can be provided.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of an embodiment of the present invention.

FIG. 2A is a side view of a main part of a clip, and FIG. 2B is a bottom view.

FIG. 3A is a front view of a main part of a driving member, and FIG. 3B is a plan view.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 rear shaft 11 cap 2 front shaft 21 front opening 3 clip 31 mounting portion 32 convex portion 4 driving member 41 concave portion 5 fixing screw 6 refill holder 61 actuator 71 cam 72 cam chassis 73 cam groove 8 driving pin 9 refill 91 pen body

Claims (1)

(57) [Scope of request for utility model registration] When the rear shaft is rotated with respect to the front shaft, a driving member disposed in the rear shaft moves the refill holder forward and backward while rotating, and the pen body at the tip of the refill held by the refill holder is moved forward. In the rotating / extending type writing instrument which protrudes and retracts from the shaft tip opening, the driving member cooperates with a fixing screw to hold the annular mounting portion at the tail end of the clip inserted through the window hole of the rear shaft to the rear shaft. Two concave portions and two concave portions which are arranged opposite to each other are provided on the tail edge of the driving member and the mounting portion of the clip .
A rotary dispensing writing instrument, wherein two convex portions which are similarly arranged to face each other are formed, and the concave portions and the convex portions are engaged with each other.