JP2012228781A - Shaking mechanical pencil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shaking mechanical pencil with improved appearance in which major portions of a weight body 11 and a lead tank 3 are covered with an insertion part of a top cap 12 and decoration such as pattern and indication or coloring and the like are applied to the insertion part of the top cap 12.SOLUTION: In this shaking mechanical pencil delivering a lead 9 by advancing a chuck 1 by inertia force of a weight body 11, the shaking mechanical pencil includes: a barrel cylinder 7 having transparency; a top cap 12 attached to the barrel cylinder; a pressing member 16 slidably built in the top cap 12; a return spring 14 attached between the top cap 12 and the pressing member 16 and biasing the pressing member 16 backward in a longitudinal direction; and a lead tank 3 connected to the chuck 1 and capable of abutting against a pressing surface of the pressing member 16. The weight body 11 positioned between an outer surface of the lead tank 3 and the inner surface of the top cap 12 is slidably provided in the longitudinal direction. The inner stage of the top cap 12 and the weight body 11 are configured so as to be abuttable, and the length of the insertion part of the top cap 12 inserted into the barrel cylinder 7 is configured so as to be not less than half the entire length of the barrel cylinder 7.

Description

  The present invention relates to a swing-out mechanical pencil that advances a chuck by an inertial force of a weight body and feeds a lead.

  Conventional low-cost swing-out mechanical pencils have a crown attached to the rear of the barrel, a slidable pressing member built into the crown, and a return spring attached between the crown and the pressing member. 2. Description of the Related Art A swing-out type mechanical pencil is known in which a pressing member is urged rearward in the longitudinal direction, and a lead tank connected to a chuck and a pressing surface of the pressing member can be contacted. (See Patent Document 1)

  However, in the above-mentioned swing-out type mechanical pencil, the length of the insertion part of the crown that is inserted into the shaft cylinder is about 30% or less of the total length of the shaft cylinder. Therefore, if the shaft tube is made transparent, the weight body will be seen through, so even if a pattern or display is printed on the shaft tube, it cannot be clearly confirmed, and the pattern or display is printed on the insertion part of the crown. It was impossible to decorate by sticking or sticking a seal.

Japanese Patent No. 3831071

  The problems to be solved are that the insertion part of the crown cannot be decorated, and the weight body and core tank can be seen through the transparent shaft tube, and a pattern and display are provided on the transparent shaft tube. However, it cannot be confirmed clearly.

  The present invention relates to a swing-out mechanical pencil that advances a chuck by an inertial force of a weight body generated by shaking a shaft cylinder to feed out a core, a transparent shaft cylinder, and a crown attached to the rear part of the shaft cylinder, A pressing member slidably incorporated in the crown, a return spring attached between the crown and the pressing member and biasing the pressing member rearward in the longitudinal direction; and a pressing surface of the pressing member connected to the chuck A core tank that can contact the inner surface of the head crown and is located between the outer surface of the core tank and the inner surface of the crown, and is slidable in the longitudinal direction. The main feature is that the length of the insertion part of the crown inserted into the shaft cylinder is more than half of the total length of the shaft cylinder.

  In the present invention, since the insertion portion of the crown attached to the shaft cylinder is inserted more than half of the total length of the shaft cylinder, the main portion of the weight body and the core tank is covered, and the pattern, display or coloring is applied to the insertion portion of the crown. An advantage that the appearance of the swing-out mechanical pencil can be improved by performing decoration such as the above is obtained.

FIG. 1 is a front view showing a swing-out mechanical pencil according to a first embodiment of the present invention. Example 1 FIG. 2 is a cross-sectional view illustrating the swing-out mechanical pencil according to the first embodiment of the present invention. Example 1 3 is an enlarged cross-sectional view taken along line AA of FIG. Example 1 FIG. 4 is an enlarged cross-sectional view showing the BB line of FIG. Example 1 FIG. 5 is an enlarged sectional view taken along line CC of FIG. Example 1 FIG. 6 is an enlarged front view showing the crown of FIG. Example 1 FIG. 7 is an enlarged front view showing the pressing member of FIG. Example 1 FIG. 8 is an enlarged plan view showing the pressing member of FIG. Example 1 FIG. 9 is an enlarged front view showing a configuration in which a pressing member, a return spring, an eraser, and a knob are incorporated into the crown of the swing-out mechanical pencil according to the first embodiment of the present invention. Example 1 FIG. 10 is an enlarged sectional view taken along line AA of FIG. Example 1 FIG. 11 is a front view showing the swing-out mechanical pencil according to the second embodiment of the present invention. (Example 2)

  According to the present invention, the main part of the weight body and the core tank is covered with a head crown, thereby realizing a swing-out type mechanical pencil in which a pattern or display provided on the head crown or a transparent shaft tube can be easily visually observed.

  Hereinafter, based on FIGS. 1, 2, 3, 4, 4, 5, 6, 7, 8, 9, and 10, the swing-out mechanical pencil according to the first embodiment of the present invention will be described. Moreover, let the left side of FIG. 1 be the front, and let the right side be back. First, a chuck 1, a core tank 3 connected to the chuck 1 via a connector 2, a fastener 4 fitted on the head 1A of the chuck 1, a connector 5 for receiving the fastener 4, and a connector 5 and a spring 6 attached between the connector 2 constitute a mechanical part of a swing-out mechanical pencil. The shaft tube 7 is made of transparent or colored synthetic resin having transparency, and the front hole 7A of the shaft tube 7 is configured to allow the core tank 3 and the connector 2 of the mechanism part to be inserted therethrough. The mechanism portion is inserted through the front hole 7A of the shaft cylinder 7, and the connecting tool 5 is held by the inner stage 8A of the tip member 8 screwed to the front end of the shaft cylinder 7 and the front portion of the shaft cylinder 7. The tip member 8 incorporates a core holder 10 made of an elastic body such as rubber that holds the core 9 with an appropriate force. The shaft tube 7 is formed with an inner hole 7B that is opened from the rear end and has a diameter larger than that of the front hole 7A, and a locking window 7C is formed at the rear portion of the shaft tube 7. Further, a concave groove 7D extending forward in the longitudinal direction from the rear end is formed at a position facing the locking window 7C of the shaft cylinder 7. A weight body 11 formed in a cylindrical shape by winding a metal wire rod is slidably incorporated in the inner hole 7B of the shaft cylinder 7, and the core tank 3 is inserted into the through hole of the weight body 11. . The head crown 12 shown in FIG. 6 is made of a colored opaque synthetic resin, and is integrally formed with a clip 13 on the upper side of the rear part, and extends forward from the rear part of the large diameter and is inserted into the shaft cylinder 7. The longitudinal dimension of the insertion portion is configured to be not less than half of the total length of the shaft tube 7, preferably about 80%, and is configured to cover the weight body 11. This insertion portion is constituted by a small diameter portion 12A, and a projection 12B is formed on the outer peripheral surface of the rear portion of the small diameter portion 12A so as to be located directly below the clip 13. Furthermore, an opening window 12C extending in the longitudinal direction is formed on both sides of the rear narrow diameter portion so as to face each other, and the narrow diameter portion 12A where the projection 12B is located is configured to be appropriately elastically deformable. Further, a raised portion 12D that is located on the opposite side of the projection 12B and extends in the longitudinal direction is formed in the rear narrow diameter portion of the head crown 12. The crown 12 is formed with an inner collar 12E for preventing the core tank 3 from swinging, and a step 12F for abutting the return spring 14 is formed inside the rear part. Further, a key groove 12H is formed above and below the rear hole 12G of the crown 12 so as to face the opening window 12C at a position shifted by 90 degrees with respect to the axial center. A recess 12I slightly recessed in the circumference of the small diameter portion 12A of the crown 12 is formed by extending in the longitudinal direction, and a display 15 is provided in the recess 12I by printing. Although not shown, a display may be provided by sticking a seal to the concave portion of the crown.

  As shown in FIGS. 7 and 8, protrusions 16B are formed on both sides of the outer surface of the front cylinder 16A of the pressing member 16, and opening windows 16C are opposed to the upper and lower sides of the front cylinder 16A. The front cylinder 16A that is formed and on which the protrusion 16B is located is configured to be elastically deformable. An outer flange portion 16D is formed at the rear portion of the pressing member 16, and keys 16E that protrude outwardly are formed above and below the outer flange portion 16D at positions shifted by 90 degrees with respect to the projection 16B. Is done. Further, an inner flange 16F having a core insertion opening is formed on the inner surface of the pressing member 16, and the front surface of the inner flange 16F serves as a pressing surface for pressing the rear end of the core tank 3. After the return spring 14 is externally fitted to the front portion of the pressing member 16, the key 16E of the pressing member 16 is inserted into the key groove 12H of the crown 12 from the rear of the crown 12, and the protrusion 16B of the pressing member 16 is inserted. Is loosely fitted in the opening window 12C of the crown 12 so as to be slidable in the longitudinal direction. In addition, the return spring 14 is attached between the step portion 12F of the crown 12 and the outer flange portion 16D of the pressing member 16, so that the normal pressing member 16 is normally urged rearward in the longitudinal direction. Moreover, the rear portion of the lead tank 3 is inserted into the front inner hole 16G of the pressing member 16, and the rear end of the lead tank 3 and the pressing surface of the pressing member 16 are appropriately separated. Further, the eraser 17 is fitted and attached to the rear inner hole of the pressing member 16, and the knob 18 covering the eraser 17 is fitted to the rear outer surface of the pressing member 16 as shown in FIGS. It becomes.

  The thus-assembled crown 12 is inserted from the rear end of the barrel 7, and the raised portion 12 </ b> D of the crown 12 advances the crown 12 in accordance with the concave groove 7 </ b> D of the barrel 7. The protrusion 12 </ b> B is fitted into a locking window 7 </ b> C formed on the upper surface of the rear portion of the shaft cylinder 7, and the head crown 12 is attached to the shaft cylinder 7. The locking window 7C of the shaft cylinder 7 and the projection 12B of the crown 12 are hidden by the clip 13, so that the appearance is not impaired. In addition, the rear portion of the core tank 3 is inserted into the inner collar 12E of the head crown 12, and the weight body 11 is connected to the outer stage 2A of the connector 2 and the inner stage formed by the inner collar 12E of the head crown 12. The space is configured to be slidable in the longitudinal direction. Further, the weight body 11 and the core tank 3 are mostly covered by the narrow diameter portion 12A of the crown 12 and hidden from the transparent shaft cylinder 7, and only the display 15 provided on the narrow diameter portion 12A of the crown 12 is provided. It becomes clearly visible through the transparent barrel 7.

  The swing-out type mechanical pencil described above is used to advance the chuck 1 by the inertial force of the weight body 11 generated by shaking the shaft cylinder 7 to feed the lead 9 and to make the next lead 9 in the lead tank 3 follow. When the knob 18 is pressed, the pressing surface of the pressing member 16 presses the rear end of the lead tank 3, and the lead tank 3 and the chuck 1 move forward to discharge the shortened remaining lead in the tip member 8. The next core 9 is projected from the tip of the tip member 8.

  Further, in the first embodiment, the transparent shaft cylinder 7 is formed by covering the members incorporated in the shaft cylinder 7 such as the weight body 11 and the core tank 3 with the small diameter portion 12A of the colored opaque crown 12. Since only the small diameter part 12A of the head crown 12 is visually observed, the display 15 provided on the small diameter part 12A can be clearly confirmed.

  Hereinafter, the swing-out mechanical pencil according to the second embodiment of the present invention will be described with reference to FIG. In addition, the same member as FIG. 1 attaches | subjects the same code | symbol, and abbreviate | omits the description. First, the crown 12 is formed of a colored opaque synthetic resin. Further, a pattern is provided on the peripheral surface of the transparent shaft cylinder 7 by printing or transferring to constitute an oscillating mechanical pencil.

  The swing-out mechanical pencil of Example 2 can be clearly confirmed on the small diameter portion 12A of the crown 12 colored with the pattern 19 provided on the peripheral surface of the shaft cylinder 7, and an advantage that the appearance can be improved is obtained. Is.

  Note that the present invention is not limited to the above-described embodiment, and the gripping portion of the shaft tube is formed with recesses for preventing slippage at equal intervals in the circumferential direction or by attaching opaque rubber grips. It may be configured. In addition, even if it is not necessary to cover all of the weight body with the narrow diameter portion of the head crown, the effect of the present invention can be sufficiently expected if it is approximately half covered. Furthermore, the effect of improving the appearance can be obtained even if the head crown is made transparent and printing or sealing is provided on the small diameter portion to cover the weight body or core tank. Moreover, you may comprise a clip and a crown with separate parts. Furthermore, the members such as the shaft cylinder, the crown, the pressing member, the weight body, and the core tank are illustrated as one member for simplification of description, but two or more members are screwed and press-fitted respectively. What is necessary is just to integrate by such. Further, the connector and the core tank may be configured integrally.

  By covering the weight body and core tank built in the transparent shaft cylinder with the insertion part of the crown that extends in the longitudinal direction, the pattern and display provided on the small diameter part of the crown and the peripheral surface of the shaft cylinder Applicable to swing-out mechanical pencils that can be clearly identified.

1 Chuck 3 Core Tank 7 Shaft Cylinder 9 Core 11 Weight Body 12 Head Crown 14 Return Spring 16 Pressing Member

Claims (1)

  In a swing-out mechanical pencil that moves the chuck forward by the inertial force of the weight body generated by shaking the shaft cylinder and feeds the core, a transparent shaft cylinder, a head crown attached to the rear part of the shaft cylinder, and in the crown A slidable built-in pressing member, a return spring attached between the crown and the pressing member and urging the pressing member rearward in the longitudinal direction, and connected to the chuck and capable of contacting the pressing surface of the pressing member And a weight body is provided between the outer surface of the core tank and the inner surface of the crown and is slidable in the longitudinal direction, and the weight body and the inner stage of the crown can be brought into contact with each other. In addition, a swing-out mechanical pencil characterized in that the insertion portion of the crown inserted into the shaft cylinder is configured to be more than half of the total length of the shaft cylinder.

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