JPH10157383A - Expansion and contraction type ball point pen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make more slender an expansion and contraction type ball point pen wherein a rear shaft main body is made slender, and the rear shaft main body is slid inside a front shaft main body to expand and contract the ball point pen. SOLUTION: An expansion and contraction type ball point pen is composed of a head shaft part 1 and a rear shaft part 2 which is freely expansion and contraction adjustable by being, in a freely slidable manner, fitted inside the head shaft part 1. The head shaft part is composed of a head shaft main body 5 which fits a head shaft core 3 and threadingly fixes a mouthpiece; a ball point pen refill 8 which is shrinkingly, in a freely inserting in and drawing out manner, inserted in a core cylinder 7 internalized in the head shaft main body via a shaft core 6 to make a core tip freely protrusible from the mouthpiece 4; a slide tip metal 10 wherein the core tip of the ball point pen refill 8 is made freely extrusible via a spring 9 between the ball point pen refill 8 and the mouthpiece 4; a push rod 11 which is enabled to be freely pushed against the spring 9 by bringing a tip of the shaft core 6 in contact with the slid tip metal and communicating a base end to the tip of the rear shaft part 2; a stationarily attached body 12 provided at the rear end of the core cylinder 7; and a slide mechanism 23 provided midway. The rear shaft part 2 is composed of a rear shaft main body 16 and a stationarily attached plate 17 which is freely stationarily attachable to the stationarily attached body 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telescopic ball-point pen.

[0002]

2. Description of the Related Art A conventional telescopic ballpoint pen is disclosed in
As in the invention of No. 57040, the rear shaft body slides outside the front shaft main body, and the longitudinal movement of the rear shaft main body is transmitted to the pressing rod penetrating the inside of the front shaft main body and the rear shaft main body. The sliding bracket is pushed out by the pressing of the pressing rod, and
It is intended to hide the core of the lupen-refill.

[0003]

However, when the rear shaft body is made thinner and the rear shaft body is slid inside the front shaft body to expand and contract, the joint portion with the rear shaft body or the front shaft body is extremely narrow. As a result, there is no space for penetrating components such as the pressing rod, or only a very narrow space is left, so that it is impossible to penetrate the pressing rod, and it becomes extremely difficult to process parts.
Conversely, if the entire body is made thicker, processing becomes easier, but it becomes too heavy and cannot be used.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a rear shaft main body is made thinner, and a telescopic ball pen which attempts to expand and contract by sliding the rear shaft body inside the front shaft main body can be made thinner. In addition, it is intended to facilitate processing.

[0005]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail with reference to an embodiment shown in the drawings. A front shaft portion 1 and a rear shaft portion 2 which is slidably fitted inside the front shaft portion 1 and is adjustable in expansion and contraction. The front shaft portion 1 is fitted with the front shaft core 3 (actually, a shaft core 6 described later).
Is performed after fitting. ), A tip shaft body 5 screwed with a base 4,
A ballpoint pen refill 8 which is removably fitted into a core cylinder 7 provided in the front shaft body 5 via a shaft core 6 so that the core tip can freely protrude from the base 4, and the ballpoint pen refill 8 and the base 4 A sliding tip 10 that can freely protrude to a position where the tip of the ballpoint pen refill is concealed through a spike 9 between the shaft tip 6 and a shaft core 6 that penetrates back and forth freely and whose tip is in contact with the sliding tip 10 A pressing rod 11 whose end is linked to the front end of the rear shaft portion 2 so as to be able to be pressed against the ridge 9, and a fixing body 12 such as a permanent magnet provided at the rear end of the core cylinder 7 and a slide provided in the middle The slide mechanism 23 includes a wing spring 13 and a stopper 14, and a steady rest ring 15 provided inside a rear end portion of the front shaft main body 5.

The base end of the pressing rod 11 is formed as a ring 11 ′ and is inserted into the core tube 7. A washer-shaped adapter 19 is interposed after the ring 11 ′ to push the pressing rod 11 by the rear shaft body 16. Make it easy to transmit pressure.

The wing spring 13 of the slide mechanism 23,
The stopper 14 (also used as the steady ring 15), the steady ring 15 and the like may be general-purpose means as shown in FIG. 2, but the wing spring 13 of the slide mechanism 23 and the stopper 14 are provided in the middle of the core tube 7, By providing the steady rest ring 15 inside the rear end portion of the front shaft main body 5, the inner surface of the front shaft main body 5 is not subjected to friction due to sliding, and therefore, the material of the front shaft main body 5 is expensive such as brass or brass. Even if an inexpensive material such as aluminum, resin, or rubber is not required, there is an advantage that a material that is easy to process and light and easy to write can be provided at a low cost.

The fastening body 12 is attached to the core tube 7 via a holder 20.
When a permanent magnet is used for the fastening body 12, the permanent magnet is set so as not to protrude from the holder 20, and a gap 22 is provided between the rear shaft body 16 and the holder 20.
Is provided to minimize the leakage of the magnetic force of the permanent magnet to the outside. The movement of the ball pen heel 8 is stopped by the constricted portion 21 narrowing the center of the core tube 7.

The rear shaft portion 2 includes a rear shaft main body 16 and the fastening body 12.
The pressing rod 11 is slid by the pushing operation of the rear shaft body 16 into the front shaft body 5 to slide the rear shaft body 16.
Is pressed against the adapter 19 so that the sliding tip 1
0 is pressed, and the fastening plate 17 of the rear shaft portion 2 can be fastened to the fastening body 12 of the core cylinder 7 at the pushed-in position.

In FIG. 1, the stopper 18 is provided on the rear shaft body 16.
Is squeezed inward to form a convex shape, but as a processing means of the stopper portion 18, two slits are inserted in advance, and this portion is pushed inward at the time of intermediate assembly so that it abuts against the stopper 14 and stops. Or may be processed by other general-purpose means.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is embodied as described above.
Push the rear axle body 16 forward against the ridge 9 and press the adapter
19, the pushing rod 11, and the sliding tip 10 are pushed out to conceal the core 8 'of the ball pen heel 8, and at the same time, the fastening body 12 and the fastening plate 16 are fastened to maintain the reduced state.

To change from the contracted state to the extended state, the rear shaft body 16 is pulled backward to release the fastening body 12 and the fastening plate 16, and then pulled further backward to stop the stopper 18 and the stopper.
14 and at the same time pressed by the firing line 9 and the adapter
19, the pressing rod 11, and the sliding tip 10 move rearward, exposing the core 8 'of the ball pen heel 8 to a writing state.

[0013]

As described above, the present invention comprises a front shaft portion 1 and a rear shaft portion 2 which is slidably fitted inside the front shaft portion 1 and is adjustable in expansion and contraction. A base body 5 in which a front core 3 is fitted and a base 4 is screwed, and a base which is removably fitted into a core cylinder 7 provided in the front main body 5 via a shaft core 6 so as to be detachable. A ball-point pen refill 8 whose tip is freely protrudable from the base 4; A pressing rod 11 which penetrates through the shaft core 6 so as to be able to move back and forth, has a distal end in contact with a sliding tip 10, a base end linked to the distal end of the rear shaft portion 2, and which can be pressed against the ridge 9; 7 and a slide mechanism 23 provided in the middle of the fastening body 12 provided at the rear end.
The rear shaft portion 2 includes a rear shaft main body 16 and the fastening body 12.
The pressing rod 11 is pushed into the front shaft body 5 by the rear shaft body 16 so that the sliding rod 10 can be fixed.
And the fastening plate 17 of the rear shaft portion 2 can be freely fastened to the fastening body 12 of the core cylinder 7 at the pushed-in position.
The pressing rod 11 does not penetrate the rear shaft portion 2 and can be made extremely thin. In theory, a small diameter type slightly thicker than the core cylinder becomes possible.

Further, since the slide mechanism 23 comprises the wing spring 13 and the stopper 14 provided in the middle of the core tube 7, and the steady rest ring 15 provided inside the rear end of the front shaft body 5, No friction is applied to the inner surface of the front shaft body 5 by sliding. Therefore, even if expensive materials such as brass and brass are used as the material of the front shaft body 5, even cheap materials such as aluminum, resin, and rubber can be used. There is an advantage that a good, easy to process, light and easy to write product can be provided at a low cost.

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view of the ballpoint pen of the present invention when it is extended.

FIG. 2 is an explanatory sectional view of a ball pen according to another embodiment of the present invention.

FIG. 3 is an enlarged perspective view of a pressing rod.

[Explanation of symbols]

 1 is a front shaft portion 2 is a rear shaft portion 3 is a front shaft core 4 is a base 5 is a front shaft main body 6 is a shaft core 7 is a core tube 8 is a ball-pen rifle 9 is a spring 10 is a sliding tip 11 Is a pressing rod 12 is a fastening body 13 is a wing spring 14 is a stopper 15 is a steady ring 16 is a rear shaft body 17 is a fastening plate 18 is a stopping portion 19 is an adapter 20 is a holder 21 is a constricted portion 22 is a gap. 23 is a slide mechanism

Claims (2)

[Claims] 1. A front shaft part 1 and a rear shaft part 2 which is slidably fitted inside the front shaft part 1 and is adjustable in expansion and contraction. Tip shaft body 5 fitted and screwed with base 4
A ballpoint pen refill 8 which is inserted into and detached from a core cylinder 7 provided inside the tip shaft body 5 via a shaft core 6 so that the core tip can freely protrude from the base 4; A sliding tip 10 that can freely protrude to a position where the tip of the ballpoint pen refill is concealed via a spline 9 between the bases 4;
A pressing rod 11 which penetrates through the shaft core 6 so as to be able to move back and forth, has a distal end in contact with a sliding tip 10, a base end linked to the distal end of the rear shaft portion 2, and which can be pressed against the ridge 9; 7 comprises a fastening body 12 provided at the rear end and a slide mechanism 23 provided in the middle, and the rear shaft portion 2 comprises a rear shaft body 16 and a fastening plate 17 which can be fastened to the fastening body 12. The pressing rod 11 allows the sliding tip 10 to be freely pressed by a pushing operation of the rear shaft main body 16 into the front shaft main body 5, and the fastening plate 17 of the rear shaft portion 2 has the fastening body of the core cylinder 7 in the pushed-in position. A telescopic ballpoint pen that can be fastened to 12 and freely. 2. The slide mechanism 23 comprises: a wing spring 13 and a stopper 14 provided in the middle of a core cylinder;
2. A telescopic ball pen according to claim 1, further comprising a steady rest ring 15 provided inside the rear end of the ball pen.