JP2009285867A - Propelling pencil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a propelling pencil wherein when a core tank 2 is pressed, the projection 2B of the core tank 2 is advanced while rotating along the inclined opening groove 8B of a shaft cylinder 8, thereby rotating a core 11. <P>SOLUTION: The projection 2B is formed in the core tank 2, and an inclined opening groove 8B is formed in a shaft cylinder 8. The projection 2B of the core tank 2 is engaged with the opening groove 8B of the shaft cylinder 8, and the core tank 2 is pressed for advancing the projection 2B while rotating along the opening groove 8B of the shaft cylinder 8, and a chuck 1 is rotated together with the core tank 2, for delivering the core 11 while appropriately rotating. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a mechanical pencil in which a lead is appropriately rotated by advancing while a chuck rotates together with a lead tank.

  In general, writing instruments are written with a slight tilt, but writing with a mechanical pencil tilted reduces the lead, so the end of the lead becomes elliptical and the writing width gradually increases. It was. Therefore, it was necessary to rotate the mechanical pencil in order to maintain a narrow writing width.

In order to solve this problem, the rotor is attached to the lead tank so as not to rotate, the slider is attached to the shaft cylinder so as not to rotate, and the lead tank and the slider are moved by the pressing operation of the knock member. A mechanical pencil is known that rotates a rotor by moving a rotor and rotates a core by rotating a chuck body fixed to the core tank together with the rotor. (See Patent Document 1)
Japanese Patent No. 3852172

  However, in the case of rotating the core using a conventionally known rotor and slider, the structure becomes complicated and the cost is high, and the amount of rotation of the rotor is large due to the structure. It was very difficult to write because it rotated a lot.

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

  The present invention comprises a chuck, a lead tank coupled to the chuck, a fastener fitted to the head of the chuck, and a chuck spring that urges the chuck rearward in the longitudinal direction. A mechanical pencil that feeds a lead, forming a protrusion on the lead tank and forming an inclined opening groove in the shaft cylinder, engaging the protrusion on the lead tank with the opening groove of the shaft cylinder, and pressing the lead tank Accordingly, the first aspect is that the protrusion advances while rotating along the opening groove of the shaft cylinder, and the core is fed out while appropriately rotating as the chuck rotates together with the core tank.

  The chuck includes a chuck, a core tank connected to the chuck, a fastener fitted to the head of the chuck, and a chuck spring that urges the chuck rearward in the longitudinal direction. A mechanical pencil that is fed out and has a plurality of engaging protrusions formed at equal intervals in the circumferential direction on the core tank, and an opening groove is formed in the shaft cylinder, and the opening groove is formed by tilting the front edge and the rear edge. In addition, a front protrusion and a rear protrusion are formed on the pressing member, the rear protrusion of the pressing member is engaged with the opening groove of the shaft tube, and the pressing member is further urged rearward in the longitudinal direction by a return spring. By pressing the member, the front protrusion of the pressing member engages with the engaging protrusion of the core tank, and the rear protrusion rotates in contact with the front edge of the opening groove, and the core tank and chuck rotate together with the pressing member. By There is a second aspect to be unwound while rotating properly.

  With the mechanical pencil of the present invention, when the lead tank is pressed, the lead of the lead tank advances while rotating along the inclined opening groove of the shaft cylinder, and the lead is rotated, so that the structure is simplified and the lead is rotated. There is an effect that the amount can be appropriately set between a very small amount and not more than one rotation.

  When the lead tank is moved forward, the protrusion of the lead tank rotates along the opening groove of the shaft cylinder, so that a mechanical pencil with a simple structure and an arbitrary rotation amount can be realized.

  Hereinafter, the mechanical pencil according to the first embodiment of the present invention will be described with reference to FIGS. 1, 2, and 3. Moreover, let the left side of FIG. 1 be the front, and let the right side be back. First, a front part of a metal chuck 1 made of brass or the like is divided into three parts, and a lead tank 2 is fixed to the rear part of the chuck 1. As shown in FIG. 3, the core tank 2 is formed with an elastic piece 2A cut out in a U-shape at an intermediate portion, and a protrusion 2B is formed at the tip of the elastic piece 2A. A fastener 3 is externally fitted to the head 1 A of the chuck 1, and a chuck spring 5 is stretched between the inner stage 4 A of the connector 4 that receives the fastener 3 and the front end of the core tank 2. Is urged backward in the longitudinal direction. Further, an eraser 6 is attached to the rear part of the core tank 2 and a knob 7 covering the eraser 6 is fitted to constitute a mechanism part.

  Further, the shaft cylinder 8 forms an opening groove 8B inclined to the gripping portion 8A while the gripping portion 8A is formed in a small diameter. Further, a clip 9 is formed at the rear portion of the shaft tube 8.

  The mechanism portion is inserted from the rear side of the shaft tube 8, the connecting tool 4 projects from the front end of the shaft tube 8, and the protrusion 2 </ b> B of the core tank 2 is engaged with the opening groove 8 </ b> B of the shaft tube 8. Further, a grip 10 made of a soft material such as rubber is put on the gripping portion 8A of the shaft cylinder 8, and the opening groove 8B of the shaft cylinder 8 is covered by the grip 10. Further, the mechanical pencil of the first embodiment is configured by removably screwing the tip member 13 containing the lead holder 12 holding the lead 11 with an appropriate force to the connector 4 protruding from the front end of the shaft tube 8. The

  Next, when the lead 11 is appropriately worn by writing, pressing the knob 7 advances the lead tank 2 and the chuck 1 while compressing the chuck spring 5. At this time, the protrusion 2B of the core tank 2 advances while rotating along the inclined opening groove 8B of the shaft cylinder 8. Therefore, the core 11 held by the chuck 1 is also fed out while rotating. Then, the fastener 3 fitted on the chuck 1 is brought into contact with the locking step 13A of the tip member 13, and the fastener 3 is detached from the head 1A of the chuck 1. Then, the chuck 1 is expanded and the lead 11 is released.

  When the pressing of the knob 7 is released in this state, the lead tank 2 urged rearward by the chuck spring 5 moves backward while the protrusion 2B rotates in the reverse direction along the opening groove 8B of the shaft tube 8. Further, since the lead 11 is released from the chuck 1, even if the chuck 1 moves backward while rotating in the reverse direction, the lead 11 is not rotated or retracted. And the chuck | zipper 1 is again pressed by the fastener 3, and it returns to the writing state of FIG. Therefore, the lead 11 is fed out by a certain amount and rotated by a certain amount.

  Hereinafter, the mechanical pencil according to the second embodiment of the present invention will be described with reference to FIG. Moreover, let the left side of FIG. 4 be the front, and let the right side be back. First, a front part of a metal chuck 101 made of brass or the like is divided into three parts, and a synthetic resin connector 14 is press-fitted and fixed to the rear part of the chuck 101. Further, a core tank 102 made of synthetic resin is press-fitted and fixed to the rear part of the connector 14. Further, a raised portion 102C is formed at the rear portion of the core tank 102, and a plurality of engaging projections 102D are formed at equal intervals in the circumferential direction on the raised portion 102C.

  A fastener 103 is externally fitted to the head 101A of the chuck 101, and a chuck spring 105 is stretched between the connecting member 104 that receives the fastener 103 and the front end of the connector 14 with a load of about 150 g. 101 is urged rearward in the longitudinal direction.

  A weight body 15 is loosely fitted on the outside of the core tank 102, and the weight body 15 is configured to be slidable in the longitudinal direction between the outer casing 14A of the connector 14 and the raised portion 102C of the core tank 102.

  The connecting device 104 is held by the front end of the front shaft 16 and the inner stage 113B of the tip member 113, and the mechanism portion is built in the front shaft 16. The tip member 113 contains a lead holder 12 that holds the lead 11 with an appropriate force. Further, a grip 110 made of a soft material such as rubber is attached to the front shaft 16, and the grip 110 is held between the rear end of the front member 113 and the outer flange 16 </ b> A of the front shaft 16.

  The rear shaft 17 is formed with an inclined opening groove 17A, and the opening groove 17A is configured such that the front end edge 17B is steeper than the rear end edge 17C. A front protrusion 18A and a rear protrusion 18B extending in the longitudinal direction are formed on the outer surface of the pressing member 18, and the rear protrusion 18B is engaged with the opening groove 17A of the rear shaft 17. Further, an inner shaft 19 is fixed to the rear portion of the pressing member 18, and a return spring 20 is stretched between the inner flange 17D of the rear shaft 17 and the outer stage 19A of the inner shaft 19 with a load at the time of about 300 g. The rear end of the pressing member 18 is brought into contact with the inner flange 17D of the rear shaft 17. Further, an eraser 106 is attached to the rear portion of the inner shaft 19 and a knob 107 covering the eraser 106 is fitted.

  Further, an outer sheath 21 is fitted on the rear shaft 17, and the outer sheath 21 covers the opening groove 17 </ b> A of the rear shaft 17. Further, a clip 109 is formed at the rear portion of the outer sheath 21.

  A rear shaft 17 is detachably screwed to the front shaft 16, and an outer sheath 21 is held by an outer rod 16 </ b> A of the front shaft 16 and an outer rod 17 </ b> E of the rear shaft 17. The front shaft 16 and the rear shaft 17 constitute a shaft cylinder, and the mechanical pencil of the second embodiment is configured.

  Next, when the core 11 is appropriately worn by writing, when the shaft cylinder is shaken, the core tank 102 and the chuck 101 move forward while compressing the chuck spring 105 by the inertial force of the weight body 15. However, in this case, the core 11 does not rotate. When the core 11 is rotated, when the knob 107 protruding from the rear end of the rear shaft 17 is pressed, the rear protrusion 18B comes into contact with the front end edge 17B of the opening groove 17A inclined on the rear shaft 17 (see FIG. When the rear projection 18B moves forward along the front end edge 17B, the pressing member 18 moves forward while rotating. Then, the front protrusion 18A of the pressing member 18 engages with the engagement protrusion 102D of the lead tank 102 to enter the state shown in FIG. 5B, and the lead tank 102 and the chuck 101 are rotated. When the inner flange 18C of the pressing member 18 contacts the rear end of the lead tank 102, the lead tank 102 and the chuck 101 rotate while moving forward together with the pushing member 18, and the lead 11 held by the chuck 101 also rotates. It is paid out. Then, the fastener 103 fitted on the chuck 101 is brought into contact with the locking step 113A of the tip member 113, and the fastener 103 is detached from the head portion 101A of the chuck 101. Then, the chuck 101 is expanded to release the core 11. Further, the rear protrusion 18B reaches the most advanced position of the opening groove 17A, and is in the state shown in FIG.

  When the pressing of the knob 107 is released in this state, the rear protrusion 18B of the pressing member 18 is in the opening groove 17A of the rear shaft 17 while the front protrusion 18A of the pressing member 18 is engaged with the engaging protrusion 102D of the core tank 102. Retreat without rotating. Then, the head 101 </ b> A of the chuck 101 is pressed by the fastener 103 and the chuck 101 is closed to hold the core 11.

  Then, the retraction of the chuck 101 and the lead tank 102 is stopped, but the pressing member 18 is further retracted, and the engagement protrusion 102D of the lead tank 102 and the front protrusion 18A of the pressing member 18 are disengaged. Thereafter, the rear protrusion 18B of the pressing member 18 is brought into contact with the inclined rear end edge 17C of the opening groove 17A of the rear shaft 17, and the rear protrusion 18B moves back along the rear end edge 17C so that the pressing member 18 rotates. While retreating. At this time, since the engaging protrusion 102D of the lead tank 102 and the front protrusion 18A of the pressing member 18 are not engaged, the lead tank 102 and the chuck 101 do not rotate. Then, when the rear protrusion 18B of the pressing member 18 reaches the last retracted position of the rear end edge 17C of the rear shaft 17, the backward movement of the pressing member 18 is stopped and the state returns to the state of FIG. 4 and FIG.

  In the case of the second embodiment, there is an advantage that the lead 11 can be rotated even in the swing-out mechanical pencil.

  Hereinafter, the mechanical pencil according to the third embodiment of the present invention will be described with reference to FIG. The same members as those in FIG. 4 are denoted by the same reference numerals, and the description thereof is omitted. The lead tank 202 is made of a synthetic resin pipe material, and the cam member 22 is fixed to the rear portion of the lead tank 202. A plurality of engaging protrusions 22A are formed on the cam member 22 at equal intervals in the circumferential direction.

  In the case of the third embodiment, there is an advantage that the core tank 202 can be manufactured easily and without variation.

  In addition, this invention is not limited to the said Example, Members, such as a core tank, a shaft cylinder, a front axis | shaft, and a rear axis | shaft, can also be integrated by adhering or fitting a some member.

  When the lead tank is pressed, the lead can be fed out by a certain amount, the lead can be rotated, and the lead can be applied to a mechanical pencil that can arbitrarily set the rotation amount of the lead.

It is sectional drawing which shows the mechanical pencil of Example 1 of this invention. Example 1 It is a fragmentary sectional view which shows the mechanical pencil of Example 1 of this invention. Example 1 It is a top view which shows the core tank in the mechanical pencil of Example 1 of this invention. Example 1 It is sectional drawing which shows the mechanical pencil of Example 2 of this invention. (Example 2) The state of the protrusion of the lead tank and the front protrusion of the pressing member and the opening groove of the rear shaft and the rear protrusion of the pressing member in the mechanical pencil according to the second embodiment of the present invention is shown in FIG. FIG. 5B is a development view showing a state in which the chuck and the lead tank are rotated, and FIG. 5C is a development view showing a state in which the rear protrusion has reached the most advanced position. (Example 2) It is sectional drawing which shows the mechanical pencil of Example 3 of this invention. (Example 3)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chuck 1A Head of chuck 1 2 core tank 2B Protrusion of core tank 2 3 Fastener 5 Chuck spring 8 Shaft cylinder 8B Opening groove of shaft cylinder 8 11 Core 18 Push member 18A Front projection 18B Push member 18 Rear projection 20 Return spring 101 Chuck 101A Chuck 101 head 102 Core tank 102D Engagement projection of core tank 102 103 Fastener 105 Chuck spring 202 Core tank

Claims (2)

  Sharp, which consists of a chuck, a lead tank connected to the chuck, a fastener fitted to the head of the chuck, and a chuck spring that urges the chuck rearward in the longitudinal direction. A pencil is formed with a protrusion formed in the core tank and an inclined groove formed in the shaft cylinder, the protrusion of the core tank is engaged with the opening groove of the shaft cylinder, and the protrusion is pivoted by pressing the core tank. A mechanical pencil, which advances while rotating along the opening groove of the cylinder, and is fed out while appropriately rotating the core by rotating the chuck together with the core tank.   Sharp, which consists of a chuck, a lead tank connected to the chuck, a fastener fitted to the head of the chuck, and a chuck spring that urges the chuck rearward in the longitudinal direction. A pencil, and a plurality of engaging projections formed in the core tank at equal intervals in the circumferential direction, and an opening groove is formed in the shaft cylinder, the opening groove is formed by tilting a front end edge and a rear end edge; In addition, a front protrusion and a rear protrusion are formed on the pressing member, the rear protrusion of the pressing member is engaged with the opening groove of the shaft tube, and the pressing member is further urged rearward in the longitudinal direction by a return spring. By pressing, the front protrusion of the pressing member engages with the engaging protrusion of the lead tank, and the rear protrusion comes into contact with the front edge of the opening groove and rotates, and the lead tank and the chuck rotate together with the pressing member. Due to the core Pencil characterized in that it is fed with Yichun rotated.

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