JP4766963B2 - mechanical pencil - Google Patents

Description

  According to the present invention, by pushing the knock member, the lead tank is advanced through a push member that slides in conjunction with the knock member, and the chuck provided in front of the lead tank is advanced by the advance of the lead tank. It relates to mechanical pencils that extend the lead.

  Conventionally, by pressing the knock member protruding from the rear end portion of the shaft cylinder, the lead tank is moved forward by the knock member and directly or in conjunction with the knock member, and the lead tank advances, A knock-type mechanical pencil that advances a chuck provided at the front portion of the tank and feeds the lead is well known, and is disclosed in Japanese Patent Application Laid-Open No. 8-156483, “Knock-type mechanical pencil”.

  In such a conventional knock type mechanical pencil, the knock member is slidably disposed by being urged toward the rear end side of the shaft tube by a coil spring disposed at the rear end portion of the shaft tube. A protrusion formed on the outer wall of the knock member is slidably engaged from an opening window formed in the crown so as not to come out from the side.

By the way, a mechanical pencil for notebooks and a mechanical pencil for composite writing tools in which a plurality of writing bodies are combined have a restriction that the shaft tube must be formed in a small diameter and cannot be formed in a long length.
Japanese Patent Application Laid-Open No. 08-156483

  However, the mechanical pencil disclosed in Patent Document 1 requires a coil spring and an opening window for engaging the knock member in the crown attached to the rear end portion of the shaft cylinder, so that the total length becomes long. There was a problem, and it was unsuitable for mechanical pencils for notebooks and for mechanical writing instruments with multiple writing instruments combined.

  In addition, the protrusion formed on the knock member not only serves as a step receiving the coil spring, but also serves as a protrusion that engages with the opening window, so it is necessary to increase the distance protruding in the radial direction. There has been a problem that the outer diameter becomes large.

  An object of this invention is to provide the mechanical pencil which eliminates the said subject.

According to the present invention, by pressing the knock member, the lead tank disposed in the shaft cylinder is advanced through the press member sliding in conjunction with the knock member and the core interlocking with the press member, and the lead As the tank advances, the chuck provided in front of the lead tank is advanced to feed out the lead, and the chuck is advanced by the inertial force of the weight body slidably fitted in the longitudinal direction outside the lead tank. A swing- out type mechanical pencil for feeding out a lead, wherein a tip end portion of a crown is mounted in a rear end portion of the shaft cylinder, a pressing member is provided in the crown, a rear end step portion of the crown, and the head A coil spring is disposed between the step portion of the pressing member positioned behind the crown, the pressing member is urged toward the rear end side of the shaft tube, and is slidably disposed. From the diameter of the tip opening of the crown, protruding in the radial direction at the tip And the projection of Kina outer diameter to form a slit extending in the axial direction, and restrict the movement of the barrel rear end side of the pressing member by the tip step portion of the Atamakanmuri, in the distal end portion of the pressing member, Mounted so that the rear end convex portion of the core that forms a concave portion for preventing horizontal blurring of the core tank that is larger than the outer diameter of the core tank is located, and the concave portion for preventing horizontal deflection of the core tank covers the core tank. The weight body is restricted from moving backward by the dent portion for preventing the horizontal shaking of the core tank .

  The mechanical pencil of the present invention can provide a mechanical pencil having a small diameter and a simple structure such as a mechanical pencil for a notebook or a mechanical pencil for a composite writing instrument.

  Next, examples of the mechanical pencil of the present invention will be described with reference to the drawings, but the present invention is not limited to the following examples.

  In the following, the mechanical pencil A in the present invention shown in FIG. 1 to FIG. 3 presses and fixes a connector 2 made of synthetic resin to the rear end portion of a metal chuck 1 made of brass or the like. A tightening ring 3 is externally fitted to the head 1 a of the chuck 1, and a spring 5 having a relatively weak force is disposed between the inner stage 4 a of the inner shaft 4 that receives the tightening ring 3 and the connector 2. Therefore, at the normal time, the tip end portion of the chuck 1 urged rearward by the spring 5 is pressed by the fastening ring 3 and closed to hold the core 6.

Further, the leading end portion of the lead tank 7 is engaged with the connector 2, and the lead tank 7 is swingably connected to the connector 2, and the rear end portion of the lead tank 7 is appropriately swung to the recessed portion 10 a of the core 10. Inserted movably. A weight body 8 is fitted on the outside of the core tank 7 so as to be slidable in the longitudinal direction.

Further, the core 10 is disposed at the tip of the crown 9 that is press-fitted and fixed to the rear end of the shaft tube 13 made of stainless steel pipe, and the pressing member 11 is positioned so as to be positioned at the rear end of the core 10. It is slidably arranged. In addition, since the coil spring 12 is disposed between the inner step portion 9 a of the head crown 9 and the outer step portion 11 a of the pressing member 11, the rear end of the core 10 contacts the front end of the head crown 9. Further, a knock member 17 is detachably attached to the rear end portion of the pressing member 11.

  Further, an O-ring 14 is provided in the front concave groove 4b of the inner shaft 4, and a base 16 incorporating a core holder 15 is detachably screwed onto the inner shaft 4, but is provided on the inner shaft 4. The O-ring 14 is brought into pressure contact with the base 16 to prevent the base 16 from being loosened, thereby forming an oscillating mechanical pencil.

  At the distal end portion of the pressing member 11, a protruding portion 11b that protrudes in the radial direction and has an outer diameter larger than the minimum inner diameter of the distal end surface 9b of the crown 9, and a slit 11c that extends in the axial direction are formed. For this reason, when the pressing member 11 is inserted into the crown 9 from the rear end side of the shaft tube 13, the tip protrusion 11b of the pressing member 11 is bent inward by the slit 11c, so that it can be easily inserted. When the protrusion 11b exceeds the tip end surface 9b of the head crown 9, it returns to the original state, and therefore does not come off to the rear end side of the shaft tube 13.

  By adopting such a structure, the pressing member 11 can be slidably disposed without increasing the length of the head crown 9, so that the entire mechanical pencil A can be shortened.

  Further, since the step portion 11a for receiving the coil spring 12 and the protrusion 11b for preventing the separation are provided separately, the outer diameter of the step portion 11a for receiving the coil spring 12 can be shortened as much as possible. The diameter can be reduced.

Further, the rear end convex portion 10b of the core 10 in which the concave portion 10a for preventing the horizontal deflection of the core tank larger than the outer diameter of the core tank 7 is formed at the front end portion of the pressing member 11, the concave portion 10a for preventing the horizontal deflection of the core tank. By mounting so as to cover the core tank 7, not only is the horizontal blur of the core tank 7 prevented, but also after the pressing member 11 is mounted, the tip of the pressing member 11 is brought inward by the convex portion 10 b of the core 10. Since it prevents that it bends, since the press member 11 does not remove | deviate, it is preferable.

  Hereinafter, the slide-type multi-core writing instrument 101 shown in FIGS. 4 to 5 has one swing-out writing instrument 1 obtained in Example 1, two ballpoint pens B, and a rear shaft 104 by coil springs 107 and 108. This is a conventionally known slide type multi-core writing instrument that is urged and stored behind the rear end.

Specifically, the slide type multi-core writing instrument 101 has a front shaft 103 screwed to a rear end portion of a base 102 and a rear shaft 104 screwed to a rear end portion of the front shaft 103 via a connecting screw 130. It is. Further, a shaft cylinder main body formed by engaging the sliding member 110 with the rear end portion of the rear shaft 104 is constituted. In addition, a head crown 131 is detachably attached to the rear end portion of the sliding member 110 so as to cover the eraser 132, and a grip member 133 is attached to the front shaft 103.

  The ballpoint pen B has a ballpoint pen tip 128 that press-fits a black oil-based ink (not shown) at the front end opening of the ink containing cylinder 127 and that holds the ball rotatably. Although not shown, the other ballpoint pen is a ballpoint pen comprising a tip member that rotatably holds a ball in the tip opening of an ink containing cylinder containing red oil-based ink (not shown). The chip is press-fitted.

Further, the rear end opening of the ink reservoir tube 27 of the ballpoint pen B, sliding member and the distal end portion of the slide member 106 as the operating body press-fitted and attached to the rear shaft 104 ridges 106a of the slide member 106 It is held in a state protruding from 110 . Although not shown, the other ballpoint pen is also arranged so that a slide member (not shown) attached to the rear end of the ink containing cylinder 29 protrudes from the slide member 110 to the outside. It is set up.

When using the mechanical pencil A, the locking portion 105b of the slide member 105 slides by advancing the raised portion 105a of the slide member 105 press-fitted to the pressing member 11 in the direction of the distal end opening portion 102a of the base 102. The sliding member coil spring 109 urges the rear shaft 104 toward the rear end of the rear shaft 104 with the front end of the mechanical pencil A protruding from the locked portion 110b formed on the member 110. By pressing the arranged sliding member 110 in the direction of the distal end opening 102 a of the base 102, the sliding member 110 moves forward in the direction of the distal end opening 102 a of the base 102. 105, the lead tank 7 connected to the slide member 105 moves forward in the direction of the tip opening 102a of the base 102. As a result, the lead tank 7 comes into contact with the rear end of the connector 2, the connector 2 moves forward, the chuck 1 can be moved forward, and the lead 6 can be fed out.

  Further, when the lead core 6 is drawn out when the mechanical pencil A is swung out, the weight body 8 moves forward in the longitudinal direction due to the inertial force of the weight body 8 generated by shaking the multi-core writing instrument 1, and the weight body 8 is connected to the connector 2. The connector 2 moves forward to move the chuck 1 forward, and the lead 6 can be fed out.

When the ballpoint pen B is used, the raised portion 106a of the slide member 106 is advanced in the direction of the distal end opening 102a of the base 102 , whereby the engaging portion 106b of the slide member 106 is formed on the slide member 110. The ballpoint pen tip 128 of the ballpoint pen B is used while being kept protruding from the front end opening 102a of the base 102 by being locked to a stop (not shown).

  When the mechanical pencil A is used from this state, the protrusion 105c of the slide member 105 is moved to the locked portion 110a by advancing the raised portion 105a of the slide member 105 toward the tip opening 102a of the base 102. It abuts on the slide member 106 that is locked, pushes out the locking portion 106b, releases the lock of the slide member 106, and returns to its original state by the elastic force of the coil spring 108. Further, by causing the raised portion 105a to advance in the direction of the tip opening 102a of the base 102, the locking portion 5b of the slide member 105 is locked to the corresponding locked portion 110b, and the tip of the mechanical pencil A protrudes. Can be maintained.

  The mechanical pencil of the present invention is a knock type mechanical pencil for notebooks that has a small diameter cylinder and cannot be configured with a long overall length, and a multi-core writing instrument that is a combination of multiple writing bodies whose diameter is large in advance. Applicable as a pencil.

It is a longitudinal cross-sectional view which shows the mechanical pencil of Example 1 of this invention. It is a principal part expanded sectional view in which a part was omitted in FIG. It is an expanded sectional view of the pressing member in FIG. It is a longitudinal cross-sectional view which shows the state which mounted the mechanical pencil of this invention in the slide-type multi-core writing instrument. It is a longitudinal cross-sectional view which shows the state which extended | stretched the mechanical pencil body in FIG.

Explanation of symbols

A Mechanical pencil 1 Chuck 2 Collector 3 Fastening ring 4 Inner shaft 5 Spring 6 Core 7 Core tank 8 Weight body 9 Head crown 10 Core 11 Press member 12 Coil spring 13 Shaft cylinder 14 O-ring 15 Core holder 16 Base 101 Slide type Multi-core writing instrument 102 Base 103 Intermediate shaft 104 Rear shaft 105, 106 Slide member 105a, 106a Raised portion 105b, 106b Locked portion 105c, 106c Release projection 107, 108 Coil spring 109 Coil spring for slide body 110 Slide member 127, 129 Ink receiving tube 128 Ball-point pen tip 130 Connection screw 131 Head crown 132 Eraser 133 Grip member

Claims (1)

By pressing the knock member, the core member disposed in the shaft cylinder is advanced via the pressing member that slides in conjunction with the knock member and the core that operates in conjunction with the pressing member. The chuck provided in front of the lead tank is advanced to feed out the lead, and the chuck is advanced by the inertial force of a weight body slidably fitted in the longitudinal direction outside the lead tank so as to feed out the writing lead. a mechanical pencil of the formula, wherein fitted to the barrel rear end portion of the distal end portion of Atamakanmuri, the pressing member within the head crown, and the rear end stepped portion of the Atamakanmuri, the rear of the head crown A coil spring is disposed between the stepped portion of the pressing member, and the pressing member is urged toward the rear end side of the shaft tube so as to be slidable, and a diameter is provided at the distal end portion of the pressing member. The outer diameter is larger than the diameter of the tip opening of the crown And the projection, a slit extending in the axial direction, and restrict the movement of the barrel rear end side of the pressing member by the tip step portion of the Atamakanmuri, in the distal end portion of the pressing member, outside the lead tank A rear end convex portion of the core that forms a concave portion for preventing lateral blurring of the core tank larger than the diameter is located, and the concave portion for preventing lateral blurring of the core tank is mounted so as to cover the core tank; The mechanical pencil is characterized in that the backward movement is restricted by the dent portion for preventing the horizontal shaking of the core tank .

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