JP2010184358A - Shake-out type mechanical pencil assembly for composite writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shake-out mechanical pencil assembly for a composite writing utensil which is of such a structure that a weight member 12 can slide with no resistance between a slender barrel 11 and a lead tank 13, and the lead tank 13 can be installed at a low cost. <P>SOLUTION: In the composite writing utensil making writing by selecting a plurality of writing elements by a retraction means and allowing the writing element to jut out of the apex of the writing utensil body, the shake-out mechanical pencil assembly comprises a small-diameter barrel 11, a chuck 1 urged to the rear part in the longitudinal direction by a spring 5, a connector 2 linked to the rear part of the chuck 1, a pressing member 9 which is installed at the rear part of the barrel 11 and urged to the rear part in the longitudinal direction by a knock spring 10 installed at the rear part of the barrel, the lead tank 13 which is loosely fitted between the connector 2 and the pressing member 9, and the weight member 12 which is loosely fitted slidably in the longitudinal direction outside the lead tank 13. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a swing-out type mechanical pencil body for a composite writing instrument in which an arbitrary writing body is selected by an in / out means and is projected from a tip of a main body.

  A conventional lead-type mechanical pencil lead tank is fixed to a connector connected to a chuck. A weight body was provided outside the lead tank, and the weight body slid in the longitudinal direction when shaken, and the chuck was advanced by the inertial force of the weight body to feed the lead.

  However, when the connector and the lead tank are fixed, the lead tank is slightly bent and attached, and the lead tank may be in contact with the weight body because the full length of the lead tank is long. In order to eliminate this point, it is necessary to increase the gap between the core tank and the shaft cylinder, and the shaft cylinder becomes thick. Therefore, it was very difficult to put into practical use a swing-out mechanical pencil body for composite writing instruments. .

  As an improvement of the above-described drawbacks, a swing-out mechanical pencil in which a lead tank is connected to a connector so as to be swingable is known. (See Patent Document 1)

  However, in the case where the lead tank is connected to the connector so as to be swingable, the shape of the connector and the lead tank is complicated and the assembly is also complicated, resulting in a high cost.

JP 2007-44939 A

  The problem to be solved is that the weight cylinder is slidable in the longitudinal direction between the shaft cylinder and the core tank, so that the shaft cylinder becomes thick in order to slide the weight body without resistance. Also, when the shaft cylinder is narrowed and the gap between the shaft cylinder and the core tank is reduced, the core tank is connected to the connector so that the weight body can slide without resistance. Is complicated and the assembly is complicated and the cost is increased.

  The present invention provides a composite writing instrument in which a plurality of writing bodies including an oscillating mechanical pencil body are disposed in a main body, and an arbitrary writing body is selected by a retracting means and is projected from the front end of the main body. A chuck that is urged rearward in the longitudinal direction by a spring, a connector that is connected to the rear part of the chuck, and a pressing member that is provided at the rear part of the shaft cylinder and is urged rearward in the longitudinal direction by a knock spring, It consists of a core tank loosely fitted between the connector and the pressing member, and a weight body loosely slidably fitted in the longitudinal direction outside the core tank, and the weight body has no resistance between the shaft tube and the core tank. The first feature is that the swing-out mechanical pencil body is configured to be slidable.

  A second feature is that the core tank is made of a metal pipe.

  Furthermore, the third feature is that the outer surface and the inner surface of the weight body are lubricated.

  The swing-out mechanical pencil body for the composite writing instrument of the present invention loosely fits the core tank between the connector and the pressing member, so that the weight body can slide between the thin shaft cylinder and the core tank without resistance, and the cost is low. The lead tank can be attached. Further, since the lead tank is separated, only the chuck and the connector need be advanced, and there is an advantage that the inertial force of the weight body can be reduced.

FIG. 1 is a longitudinal sectional view showing a swing-out mechanical pencil body for the composite writing instrument of the present invention. (Example 1) FIG. 2 is a longitudinal sectional view showing a composite writing instrument having a built-in mechanical pencil according to the present invention. (Example 1) FIG. 3 is a longitudinal sectional view showing the composite writing instrument in a state in which the swing-out mechanical pencil body is projected. (Example 1) FIG. 4 is an enlarged longitudinal sectional view showing a main part of FIG. (Example 1)

  The purpose of allowing the weight body to slide without resistance even if the shaft tube is made thin is realized with a low-cost swing-out mechanical pencil body.

  Hereinafter, based on FIG. 1, the swing-out type mechanical pencil body for the composite writing instrument of Example 1 in this invention is demonstrated. Moreover, let the left side of FIG. 1 be the front, and let the right side be back. First, a synthetic resin connector 2 is press-fitted and fixed to the rear part of a metal chuck 1 made of brass or the like. A large-diameter portion 2A is formed at the rear of the connector 2, and a large-diameter rear hole 2B is formed inside the large-diameter portion 2A. A tightening ring 3 is fitted on the head 1A of the chuck 1, and a spring 5 having a relatively weak force is stretched between the inner stage 4A of the inner shaft 4 that receives the tightening ring 3 and the connector 2. Accordingly, the head 1 </ b> A of the chuck 1 that is normally biased rearward by the spring 5 holds the core 6 by being pressed against the fastening ring 3 and closed.

  A core 8 is disposed in the front part of the crown 7 whose rear part has a large diameter, and a pressing member 9 is press-fitted and fixed to the rear part of the core 8. A knock spring 10 is stretched between the rear end 7A of the crown 7 and the outer stage 9A of the pressing member 9, and the rear end of the core 8 is brought into contact with the front end of the crown 7.

  The head crown 7 is press-fitted and fixed to the rear portion of the shaft cylinder 11 formed of a stainless steel pipe having an outer diameter of 4 mm. A weight body 12 is inserted into the shaft cylinder 11, and a core tank 13 made of a metal pipe is inserted inside the weight body 12. In addition, the surface and the inner surface of the weight body 12 are lubricated. As the lubrication treatment, lubrication plating or application of a lubricant can be considered. As the lubricating plating, lubricating electroless nickel plating is preferable. As the application of the lubricant, it is conceivable to apply molybdenum disulfide, tungsten disulfide, graphite or silicon.

  Further, the rear part 4B of the inner shaft 4 is press-fitted and fixed to the front part of the shaft cylinder 11, the front part of the core tank 13 is inserted into the rear hole 2B of the connector 2, and the rear part of the core tank 13 is the front part of the core 8. The core tank 13 is loosely fitted between the rear hole 2 </ b> B of the connector 2 and the front hole 8 </ b> A of the core 8. The same lubricating treatment as that of the weight body 12 is also applied to the outer peripheral surface of the core tank 13. The weight body 12 provided outside the core tank 13 is loosely fitted between the rear end of the connector 2 and the front end of the core 8 so as to be slidable in the longitudinal direction. At this time, the lead tank 13 is loosely fitted and can be moved back and forth, and left and right, and since the lead tank 13 and the weight body 12 are lubricated, the weight body 12 can slide without resistance.

  An O-ring 14 is provided in the front concave groove 4 </ b> C of the inner shaft 4, and a base 16 containing a core holder 15 is detachably screwed onto the inner shaft 4. At this time, the O-ring 14 provided on the inner shaft 4 is pressed against the base 16 to prevent the base 16 from loosening.

  And the spare core 6 is inserted from the opening hole 9B of the said pressing member 9, and it accommodates in the core tank 13, and comprises a swing-out type mechanical pencil body.

  Next, a slide-type composite writing instrument equipped with the above-mentioned swing-out mechanical pencil body and ballpoint pen refill as a writing body will be described with reference to FIG. A slide-type composite writing instrument is conventionally known. Specifically, the front shaft 18 is screwed to the rear portion of the front member 17, and the rear shaft 19 is screwed to the rear portion of the front shaft 18. 17, the front shaft 18 and the rear shaft 19 constitute a main body. A sliding member 20 is slidably attached to the rear portion of the rear shaft 19 and a return spring 21 is stretched between an inner flange 19A of the rear shaft 19 and a front end 20A of the sliding member 20. An eraser 22 is attached to the rear end portion of the sliding member 20, and a knob 23 is detachably attached so as to cover the eraser 22. A rubber grip 24 is attached to the front shaft 18.

  The slide member 20 includes a slide member 26 for the ballpoint pen refill 25 and a slide member 27 for the swing-out mechanical pencil body so as to be slidable in the longitudinal direction, and the operation portions 26A and 27A of the slide members 26 and 27 are slid. The moving member 20 protrudes from the slide groove 20B to the outside. Furthermore, the slide member 26 for the ballpoint pen refill 25 and the slide member 27 for the swing-out mechanical pencil body are each urged rearward in the longitudinal direction by a coil spring 28. The rear end portion of the ballpoint pen refill 25 is detachably engaged with the protrusion 26B of the slide member 26 for the ballpoint refill 25. Further, the rear end portion of the pressing member 9 of the swinging mechanical pencil body is detachably engaged with the protrusion 27B of the sliding member 27 for the swinging mechanical pencil body.

  When the swing-out mechanical pencil body is used, the operation portion 27A of the slide member 27 protruding from the slide member 20 is advanced, and the locking portion 27C of the slide member 27 is provided in the slide groove 20B of the slide member 20. The base 16 of the swing-out mechanical pencil body protrudes from the tip member 17 and is in the state shown in FIGS. 3 and 4. When the composite writing instrument is shaken in this state, the weight body 12 moves forward, and the weight body 12 comes into contact with the connector 2. Then, the connector 2 and the chuck 1 are moved forward by the inertial force of the weight body 12 and the core 6 is fed out. At this time, since the lead tank 13 can move back and forth and right and left, the weight body 12 can move without resistance with the lead tank 13. Further, since the connector 2 and the lead tank 13 are separated, the only members to be advanced by the inertial force of the weight body 12 are the chuck 1, the connector 2 and the lead 6, and there is no need to move the lead tank 13 forward. The core can be extended with force. That is, since the weight body 12 can be reduced, the outer diameter of the swing-out mechanical pencil body can be reduced. Moreover, since the weight body 12 and the core tank 13 are lubricated, they can slide more smoothly.

  When the core 6 in use is shortened by writing and cannot be written, the sliding member 20 in the state of FIG. 3 in which the base 16 of the swing-out mechanical pencil body protrudes from the tip member 17. Is pressed, the step portion 16A of the base 16 comes into contact with the tip member 17. When the sliding member 20 is further pressed, the sliding member 27, the pressing member 9 and the core 8 move forward together with the sliding member 20. Then, the core 8 comes into contact with the lead tank 13, and the lead tank 13, the connector 2 and the chuck 1 move forward to cause the next lead 6 to follow. By repeating this operation several times, the shortened lead 6 is discharged, and the next lead 6 protrudes from the tip of the base 16 so that writing is possible.

  In order to finish writing and immerse the oscillating mechanical pencil body, when the slide member 26 other than the oscillating mechanical pencil body is moved forward, the engaging portion of the sliding member 27 coupled to the oscillating mechanical pencil body 27C is disengaged from the locking portion 20C provided in the slide groove 20B of the slide member 20. Then, the slide member 27 is urged rearward by the coil spring 28 and returns to the state shown in FIG.

  Next, when the ballpoint pen refill 25 is used, the slide member 26 to which the ballpoint pen refill 25 is connected is advanced, and the engagement portion 26 </ b> C of the slide member 26 is provided in the slide groove 20 </ b> B of the slide member 20. The tip of the ball-point pen refill 25 protrudes from the tip member 17 and can be written. The operation of immersing the ballpoint pen refill 25 can be performed in the same manner as the immersing of the swing-out mechanical pencil body that has moved forward.

  In addition, in Example 1 above, the desired writing body was protruded by selecting the slide member, but the means for protruding the desired writing body is not limited to the slide member type composite writing instrument, A variety of composite writing tools can be used as long as they are a composite writing tool in which a plurality of writing bodies are arranged and arbitrarily protruded, such as a composite writing tool that rotates the rear shaft to select and project the writing body.

  The weight body can slide between the thin shaft cylinder and the core tank without resistance, and the weight body can be reduced in size, and can be applied to a swing-out mechanical pencil body for a composite writing instrument to which the core tank is attached at low cost.

DESCRIPTION OF SYMBOLS 1 Chuck 2 Connector 9 Pressing member 10 Knock spring 11 Shaft cylinder 12 Weight body 13 Core tank

Claims (3)

  In a composite writing instrument in which a plurality of writing bodies including an oscillating mechanical pencil body are arranged in the main body, and an arbitrary writing body is selected by a retracting means to project from the tip of the main body, , A chuck urged rearward in the longitudinal direction by the spring, a connector connected to the rear part of the chuck, a pressing member urged rearward in the longitudinal direction by a knock spring provided at the rear part of the shaft cylinder, and the connector and the press It consists of a core tank loosely fitted between the members and a weight body loosely fitted to the outside of the core tank so as to be slidable in the longitudinal direction, and the weight body can slide between the shaft cylinder and the core tank without resistance. A swing-out mechanical pencil body for a composite writing instrument, characterized by being configured as described above.   2. The swing-out mechanical pencil body for a composite writing instrument according to claim 1, wherein the lead tank is made of a metal pipe.   The swing-out type mechanical pencil body for a composite writing instrument according to claim 1 or 2, wherein the outer surface and the inner surface of the weight body are lubricated.

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