JPH0222310Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a device for emitting and retracting a writing body in a double-ended writing instrument configured such that separate writing bodies emerge and retract from openings at both ends of a single barrel.

However, in conventional double-ended writing instruments of this kind, there are many that have separate and independent mechanisms for each writing body, and in this case, it is inevitable that the number of parts will increase, and as a result, the assembly work will be complicated. It became complicated and led to high costs.

Also, Utility Model Application No. 51-51038 and Utility Model Application No. 57-11081
As seen in the issue, by a single appearance mechanism,
Some devices have appeared that have separate cursive characters, but all of these devices are complicated to assemble or operate, are not easy to use, and lack rationality. .

The present invention is an attempt to eliminate such drawbacks seen in the prior art, and by moving one sliding member either forward or backward in the axial direction, both end surfaces of this sliding member are moved. The writing body is exposed from the barrel opening by moving one of the two writing body holding members that are in pressure contact with the writing body.Maintaining this writing state and releasing it is done by moving the elastic piece attached to the writing body holding member. The purpose is to provide a double-ended writing instrument that is highly convenient and convenient, which is not seen in the prior art, by engaging and disengaging the protrusion and two locking holes provided in the barrel.

Hereinafter, embodiments of the present invention will be described based on the drawings.

The sliding member 1 is movably accommodated in the barrel B with its grip portion H protruding from a long hole 2 bored in the barrel B, and also includes a writing body holding member that holds the writing bodies 3a and 3b, respectively. 4a and 4b are this sliding member 1
are pressed against both end surfaces 1a and 1b of the coil springs 5a and 5b, respectively, by the elastic forces of coil springs 5a and 5b.

Reference numerals 6a and 6b are elastic pieces that spring in the radial direction of the barrels attached to the writing holding members 4a and 4b, respectively, and projections 7a and 7b are provided at the tips of the elastic pieces. 7b engages with inner locking holes 8a, 8b formed in the barrel B, respectively, to house and maintain the writing holding members 4a, 4b at predetermined positions in the barrel B. Note that the protrusions 7a and 7b of the elastic pieces 6a and 6b are the cursive holding members 4a and 7b in the barrel B, respectively.
In order to realize smoother movement of the locking hole 4b and a more reliable locking state, the portions of the inner locking holes 8a, 8b that contact the outer wall are formed with a gentle slope, and the portions that contact the inner wall are formed with a gentle slope. It is best to form it on a steep slope.

Reference numerals 9a and 9b are external locking holes drilled in the barrel B, through which the writing holding members 4a and 4b resist the elastic force of the coil springs 5a and 5b due to the movement of the sliding member 1. , when moving outward of the barrel B, engages with the protrusions 7a, 7b of the elastic pieces 6a, 6b, and the brush ends 3a', 3b' of the writing bodies 3a, 3b close to the barrel openings 10a, 3b. 10b is maintained in an exposed state (writing state).

Separate cursive writing bodies 3a and 3b housed in barrel B
are removably held by the respective holding members 4a, 4b, and the holding structure is such that the ends of the writing bodies 3a, 3b are held in hollow holes 11a, 11b provided in the holding members 4a, 4b. It may be an appropriate method such as press-fitting.

In this proposal, these cursive holding members 4a, 4b
The holes 11a, 11b are respectively provided at predetermined eccentric positions (see FIGS. 2 and 3), and in this way, the holes 11a, 11b are provided at eccentric positions of both the writing holding members 4a, 4b. By providing 11b, the fitted writing bodies 3a and 3b can be accommodated in parallel without colliding at their ends, which has the advantage of facilitating dimensional control in the axial direction of the barrel B. 12a, 12b are shaft cylinder openings 10a, 10b
These are the front and rear mouth parts that form the base, and are removably screwed onto the shaft cylinder B, and receive the elastic force of the coil springs 5a and 5b at their ends.

Now, in order to expose any desired writing body from the barrel opening, it is sufficient to move the sliding member 1 either forward or backward in the axial direction of the gripping portion H of the sliding member 1, for example, When exposing one of the writing bodies 3a, the sliding member 1 is moved so that the projection 7a of the resilient piece 6a of the writing body holding member 4a separates from the inner locking hole 8a and engages with the outer locking hole 9a. It is sufficient to move the coil spring 5a forward in the axial direction, that is, in the direction of the front mouthpiece 12a, against the elastic force of the coil spring 5a, until they are aligned. Moreover, in order to release the writing state obtained in this way, the elastic piece 6a that engages with the outer locking hole 9a is
The protrusion 7a may be released from the outer locking hole 9a by pressing it with an appropriate means such as the tip of a finger.As a result, the writing holding member 4a is released by the elastic force of the coil spring 5a. Then, the protrusion 7a of the resilient piece is again engaged with the inner locking hole 8a to restore the original state.

As described above, the present invention moves one sliding member forward or backward in the axial direction of the sliding member, thereby moving the writing holding member that is in pressure contact with the end face of the sliding member on the moving side. The writing state obtained by this is maintained and released by the engagement and disengagement action between the protrusion of the elastic piece attached to the writing body holding member and the locking hole provided in the barrel. Compared to conventional writing instruments of this type, it is easy to operate, has mechanical durability, and requires fewer component parts, making it easier to assemble. It has become possible to provide a double-ended writing instrument that is easy to assemble and use.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view illustrating the entire writing implement according to the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, Fig. 3 is a sectional view taken along line B-B in Fig. 1, and Fig. 4 is a sectional view taken along line A-A in Fig. 1. FIG. 2 is a partially omitted side sectional view illustrating the operating state of the writing instrument according to the present invention. 1...Sliding member, 1a, 1b...Sliding body end surface,
3a, 3b... cursive, 4a, 4b... cursive holding member, 6a, 6b... bullet piece, 7a, 7b...
Projection, 8a, 8b...Inner locking hole, 9a, 9b
...Outer locking hole, B...Shaft cylinder.

Claims (1)

[Scope of utility model registration request] In a double-ended writing instrument in which a writing body is held by a separate writing body holding member that is movable back and forth in the axial direction from openings at both ends of the barrel,
The writing holding members 4a and 4b are pressed against both end surfaces 1a and 1b of the sliding member 1 that moves within the long hole 2 of the shaft tube B, and the side wall of the shaft tube B is located at a different location from where the long hole 2 is bored. Inner locking holes 8a, 8b drilled in and protrusions 7a, 7b that engage and disengage from outer locking holes 9a, 9b
The resilient pieces 6a, 6b having the following properties are attached to the respective writing body holding members 4a, 4b, and by moving the sliding member 1 either forward or backward in the axial direction, either of the writing body holding members 4a, 4b is attached. This is a writing device for a double-ended writing instrument in which a writing state is obtained by moving the elastic pieces 6a, 6b and engaging the protrusions 7a, 7b of the resilient pieces 6a, 6b with the outer locking holes 9a, 9b to obtain a writing state.