JP4518663B2 - Sliding composite writing instrument including mechanical pencil - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a slide-type composite writing instrument including at least one mechanical pencil body in a shaft cylinder.
[0002]
[Prior art]
A conventional slide-type composite writing instrument provided with a mechanical pencil body will be described with reference to FIGS. 1 and 2. The second type of the writing instrument is provided in a sliding groove 13 of a sliding case 12 provided in the rear end of the shaft cylinder. The sliding protrusion 4b formed at the rear end portion of the sliding body 4 by sliding one sliding body 4 biased by the coil spring 9 in the direction of the rear end of the shaft cylinder in the direction of the shaft cylinder front end opening 2a serves as a sliding case. The writing tip portion 6a of the ball-point pen body 6 can be projected from the tip end opening portion 2a of the ballpoint pen body 6 by being locked to the stop portion 12a formed on the tip 12 and attached to the rear end direction of the tip tube by the other second coil spring 10. The other protrusion 5c releases the engaging protrusion 4b that has been locked to the stopper 12a by advancing the raised portion 5a of the other sliding body 5 in the direction toward the tip of the shaft cylinder. The other engagement protrusion by advancing 5 5b is locked to the stopper 12a to maintain the protruding state, and has a feeding mechanism capable of selecting and manipulating the writing tip, while maintaining the protruding state of the mechanical pencil body 7. A lead core feeding mechanism of the mechanical pencil body 7 by pressing a resin sliding case 12 urged toward the rear end of the shaft cylinder by a first coil spring 8 disposed in front of the moving case in the direction of the end of the shaft cylinder. (Not shown) is operated to lead out the lead core.
[0003]
In the slide type composite writing instrument including the above-described conventional mechanical pencil body, although not shown, the first coil spring for urging the sliding case toward the rear end side of the shaft cylinder has a tip end surface of the sliding case. The second coil spring that becomes the first coil spring receiving portion and urges the sliding body toward the rear end of the shaft tube is disposed in the sliding groove between the protrusions formed integrally with the inside of the sliding case. It was. That is, the sliding case itself is the first and second coil spring receiving portions.
[0004]
[Problems to be solved by the invention]
However, in a sliding case that is a resin molded product, the resin may shrink due to the passage of time or the environment, and the above-described sliding groove may become narrow. When the sliding groove is narrowed, the sliding body does not slide smoothly during the feeding operation. In particular, in the case of a mechanical pencil body, the second is made so that the lead core is not broken by an impact when the writing tip is immersed in the shaft tube. The set load of the coil spring is set lower than that of the ballpoint pen body. Therefore, the urging force of the mechanical pencil body in the direction of the rear end of the shaft cylinder is small, and the second coil spring comes into contact with the sliding groove. There was a problem that it was difficult to return from the protruding state to the immersive state. In addition, there is a problem that it is technically difficult to simultaneously form a plurality of sliding grooves and protrusions for holding the second coil spring in the sliding grooves.
[0005]
An object of the present invention is to provide a mechanical pencil body in which the width of a sliding groove is less likely to change due to aging and environment, the sliding body slides smoothly during feeding operation, and can stably hold a coil spring. Including a sliding composite writing instrument.
[0006]
[Means for Solving the Problems]
In the present invention, a plurality of writing bodies including a mechanical pencil body are arranged in a shaft cylinder, and a sliding groove that opens to the outside extending along the axial direction is radially divided in a rear end portion of the shaft cylinder. A sliding body that is slidably attached to the rear end of the cylinder by a first coil spring disposed in front of the sliding case, and connected to the rear part of each writing body, The raised portion formed on the sliding body is projected from the sliding groove to the outer peripheral surface of the sliding case, and is urged toward the rear end of the shaft cylinder by the second coil spring disposed in the sliding groove to form the sliding groove. The sliding protrusion is housed in a slidable manner, and by sliding the sliding body toward the tip of the shaft tube, the engaging protrusion formed on the rear end of the sliding body is locked to the stopper formed on the sliding case. While maintaining the protruding state of the body, when the mechanical pencil body protrudes, push the sliding case toward the tip of the shaft tube. By operating the lead lead feeding mechanism of the mechanical pencil body, the slide-type composite writing instrument including the mechanical pencil body capable of feeding the lead lead has a first on the tip side of the sliding case. A coil spring receiving member having a first coil spring receiving portion for receiving the coil spring and a second coil spring receiving portion for receiving the second coil spring on the rear end side is inserted into each sliding groove. The first coil spring is supported by the first coil spring receiving portion and the second coil spring is supported by the second coil spring receiving portion.
[0007]
Further, the set load of the first coil spring is higher than the sum of the set loads of the second coil spring that urges each writing body in the rear end direction of the shaft cylinder.
[0008]
Furthermore, the first and / or second coil spring receiving portion is formed with a protrusion, and the first coil spring and / or the second coil spring is disposed in the protrusion. To do.
[0009]
The set load of the coil spring is set from the wire diameter of the coil wire, the coil pitch, the number of turns, the free length, and the total length (attachment length) of the coil spring after the coil spring is disposed. For example, when the wire diameter, the coil pitch, the number of turns, and the free length are the same, the set load of the coil spring becomes higher as the length obtained by subtracting the mounting length from the free length is longer. When the set load of the coil spring increases, the elastic force by the coil spring, in the present invention, the urging force of the sliding case or the sliding body increases. The setting load of the first coil spring is higher than the sum of the setting loads of the second coil spring that urges each writing body in the rear end direction of the shaft cylinder. This means that the urging force is high, and the coil spring receiving member is always urged toward the rear end of the shaft tube.
[0010]
The lead core feeding mechanism in the present invention is a mechanism for feeding a lead core such as a chuck generally known in mechanical pencils.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In addition, the same number is attached | subjected about the same member and the same component in drawing.
Embodiment 1
The composite writing instrument 1 including a mechanical pencil body shown in FIGS. 1 to 7 has a structure in which a front shaft 2 and a rear shaft 3 are screwed together and a sliding case 12 is attached to the rear end of the rear shaft 3. The sliding case 12 is formed with a sliding groove 13 which is partitioned in the radial direction and opened to the outside. A first coil spring receiving portion 11a that receives the first coil spring on the front end side and a second coil spring receiving portion 11b that receives the second coil spring on the rear end side at the front end (writing front end opening 2a side) of the sliding case 12. The second coil spring receiving portion 11b is inserted into each sliding groove 13 and disposed. In each sliding groove 13, three ball pen bodies 6 of different ink colors and a mechanical pencil body 7, and second coil springs 9 and 10 attached to the outer periphery thereof are connected to the second coil spring receiving portion 11 b and the ball pen body 6 and By being provided between the sliding bodies 4 and 5 attached to the rear end of the mechanical pencil body 7, it is slidably disposed by being biased backward. The raised portions 4 a and 5 a of the sliding bodies 4 and 5 are protruded from the sliding groove 13. A first coil spring 8 is disposed between the front end of the coil spring receiving member 11 and a step 3a formed on the rear shaft 3 with the rear end abutting the first coil spring receiving portion. The sliding case 12 is slidably disposed by fitting the convex portion 14 formed in the sliding case 12 into the engaging hole 15 (concave portion) of the rear shaft 3.
[0012]
In order to make the writing tip 6a of the ball-point pen body 6 appear and disappear from the shaft tube tip opening 2a, one of the raised portions 4a of the slide body is advanced in the direction of the shaft tube tip opening 2a, so that the rear end of the slide body 4 is The engaging protrusion 4b is engaged with a stopper 12a formed in the shaft cylinder, and the tip end portion 6a of the ballpoint pen body 6 can be selected and protruded from the shaft tube tip opening 2a. By moving the other raised portion 5a (clip member) forward in the direction of the shaft tip 2a, the other release projection 5c releases the engagement projection 4b locked to the one stop portion 12a, and the ballpoint pen body 6 The writing tip 6 a can be immersed in the shaft cylinder 2. Further, by advancing the clip member 5a, the other engaging projection 5b is locked to the stopper 12a, and the protruding state of the writing tip portion 7a of the mechanical pencil body can be maintained. By pressing the sliding case 12 urged toward the rear end side of the shaft cylinder by the first coil spring 8 with the writing tip 7a of the mechanical pencil body protruding, the mechanical pencil body is pressed. The lead core feeding device (not shown) can be operated to feed out the lead core.
[0013]
By fitting the second coil spring receiving portion 11b formed on the rear end side of the coil spring receiving member 11 into the sliding groove 13, it is possible to prevent the sliding groove from shrinking over time or the environment. Therefore, a smooth feeding operation is possible.
[0014]
Moreover, the protrusion 11c is formed in the coil spring receiving member 11, and the 1st coil spring 8 is inserted in this protrusion 11c, and the 1st coil spring 8 moves to the radial inside (arrow direction) of a shaft cylinder. Can be prevented. Although not shown, the same applies to the second coil springs 9 and 10. The coil spring receiving member 11 is formed with a protrusion 11e for preventing rotation.
[0015]
In the present invention, the arrangement method of the coil spring receiving member 11 is not particularly limited as long as the second coil spring receiving portion 11b is arranged so as to be fitted in each sliding groove 13, but from the arrangement position. It is preferable to dispose by over-fitting or uneven fitting so as not to shift, but the set load of the first coil spring 8 is set to the set load of the second coil spring including the second coil springs 9 and 10. Even if the coil spring receiving member 11 is merely loosely fitted, the coil spring receiving member 11 is always pressed to the rear end side of the shaft tube by the first coil spring. Since it is difficult for position displacement to occur, it is possible to simplify the structure and eliminate the need for an over-fitting fitting part or a concave-convex fitting part. .
[0016]
Embodiment 2
The composite writing instrument 21 including the mechanical pencil body shown in FIGS. 8 and 9 shows another example of the coil spring receiving member, and covers the second coil spring receiving portion of the coil spring receiving member 31 so as to cover the inner surface of the sliding case 12. In addition, the second embodiment is the same as the first embodiment except that it is inserted into the sliding groove 13. The coil spring receiving member 11 is formed with a protrusion 31e for preventing rotation.
[0017]
The slide-type composite writing instrument of the present invention is not limited to the above-described one of the mechanical pencil body and the ball pen body of three composite writing instruments, and appropriately selects a plurality of writing bodies including at least one mechanical pencil body. Can be used. Moreover, the structure which connects a sliding body to a writing body is not specifically limited.
[0018]
【The invention's effect】
As described above, the slide including the mechanical pencil body that makes it difficult for the width of the sliding groove to change with time and the environment, and that the sliding body slides smoothly during the feeding operation and can stably hold the coil spring. We were able to provide a compound writing instrument of the formula.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.
FIG. 2 is a longitudinal sectional view showing a state where a writing tip portion of the mechanical pencil body in FIG. 1 is extended.
3 is an enlarged cross-sectional view of a main part in FIG.
FIG. 4 is a view showing a coil spring receiving member.
5 is a view showing a coil spring receiving member viewed from the direction F in FIG. 4. FIG.
6 is a view showing a coil spring receiving member as seen from the direction G in FIG. 4;
7 is an enlarged cross-sectional view of an AA main part partly omitted in FIG. 3;
FIG. 8 is a longitudinal sectional view showing a second embodiment of the present invention.
9 is an enlarged cross-sectional view of an essential part of BB in FIG. 8 partially omitted.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Composite writing instrument 2 Shaft cylinder 2a Shaft cylinder front-end opening part 3 Rear shafts 4, 5 Slider body 6 Ball-point pen body 7 Mechanical pencil body 8 First coil springs 9, 10 Second coil spring 11 Coil spring receiving member 11a First coil spring receiver Part 11b second coil spring receiving part 11c protrusion 12 sliding case 13 sliding groove 31 coil spring receiving member

Claims (3)

A sliding case in which a plurality of writing bodies including a mechanical pencil body are arranged in a shaft cylinder, and a sliding groove that is open to the outside extending along the axial direction is radially divided in the rear end portion of the shaft cylinder. Slidably attached to the rear end of the cylinder by a first coil spring disposed in front of the sliding case, and a sliding body connected to the rear part of each writing body is attached to the sliding body. The formed ridges are projected from the sliding grooves to the outer peripheral surface of the sliding case, and are urged toward the rear end of the shaft cylinder by the second coil springs arranged in the sliding grooves so that they can slide in the sliding grooves. When the sliding body is slid in the axial direction, the engaging protrusion formed on the rear end of the sliding body is locked to the stopper formed on the sliding case, and the writing body protrudes. When the mechanical pencil body protrudes, press the sliding case toward the tip of the shaft tube. Further, in the slide-type composite writing instrument including the mechanical pencil body in which the lead lead feeding mechanism of the mechanical pencil body is actuated so that the lead lead can be fed out, the first coil spring at the tip side of the sliding case A coil spring receiving member having a first coil spring receiving portion for receiving the second coil spring receiving portion for receiving the second coil spring on the rear end side so that the second coil spring receiving portion is fitted into each sliding groove. A sliding-type composite writing instrument including a mechanical pencil body, wherein the first coil spring is supported by the first coil spring receiving portion and the second coil spring is supported by the second coil spring receiving portion. . 2. The mechanical pencil according to claim 1, wherein the set load of the first coil spring is higher than the sum of the set loads of the second coil spring that urges each writing body toward the rear end of the shaft cylinder. A slide-type compound writing instrument that includes the body. A protrusion is formed in the first and / or second coil spring receiving part, and the first coil spring and / or the second coil spring is disposed in the protrusion. Item 3. A sliding composite writing instrument comprising the mechanical pencil body according to Item 1 or 2.

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