JP5078135B2 - Swing-out mechanical pencil - Google Patents

Description

  The present invention relates to a swing-out type mechanical pencil that advances a chuck by an inertial force of a weight body and feeds a lead, and urges a pressing member backward in a longitudinal direction by a return spring.

Conventionally, the swing-out type mechanical pencil that advances the chuck by advancing the chuck by the inertial force of the heavy body caused by shaking inserts the core tank and the connector from the front of the shaft tube because it is easy to assemble. In addition, the connecting tool for receiving the fastener is held and fixed by the shaft tube and the base.
In addition, there is known a method in which a crown is attached to the rear portion of the shaft cylinder and the pressing member is urged rearward in the longitudinal direction by a return spring stretched between the crown and the pressing member. (See Patent Document 1)
In addition, there is known a structure in which a sheath is detachably attached to the rear portion of the shaft tube, and the pressing member is urged rearward in the longitudinal direction by a return spring stretched between the inner collar of the sheath and the pressing member. (See Patent Document 2)
JP 2004-255756 A JP 2005-125539 A

  In the case where the above-mentioned coupling tool is held and fixed by the shaft cylinder and the base, when the base is removed, the mechanism portion including the coupling tool, chuck, core tank, etc. is also detached from the shaft cylinder, and the core tank is inserted into the shaft cylinder. There was a risk that the lead would fall. In addition, when the pressing member is assembled in this state, the lead is broken between the lead tank and the shaft tube, which may cause malfunction.

In addition, when the sheath is removable from the shaft tube, the user may accidentally insert the mechanism portion from the rear of the shaft tube after removing the mechanism portion. If the sheath is attached to the shaft tube in this state, the mechanism portion may be damaged.
An object of the present invention is to provide an oscillating mechanical pencil that solves the above problems.

The present invention includes a chuck, a fastener that opens and closes the chuck, a spring that biases the chuck rearward, and a connecting tool that receives the fastener, and the chuck is advanced by the inertial force of a heavy body to feed out the lead. In the mechanical pencil, a connector is attached to the rear part of the chuck, a core tank is connected to this connector, and an inner collar is formed at the front part of the shaft tube, and the core tank and connector can be inserted into the inner casing. A crown is attached to the shaft cylinder, a push member is built in the crown so as to be slidable in the longitudinal direction, and the push member is mounted by a return spring stretched between the crown and the push member. Energizing backward in the longitudinal direction , forming an outer casing on the connector, and forming a protrusion at a substantially middle portion of the cylinder extending rearward from the outer casing, and connecting the inner casing of the shaft cylinder to the outer casing of the connector interpolation within the inner flange of the barrel and Was engaged by projections of the connector has, further, than the distance from the distance S1 of Atamakanmuri and pressing member minus the distance S2 of the pressing member and the lead tank, longer towards the connector and connector of the distance S3 The setting is the first gist.

In addition, it consists of a chuck, a fastener that opens and closes the chuck, a spring that biases the chuck backward, and a coupling that receives the fastener, and a swing-out type sharp that advances the chuck by the inertial force of the heavy body and feeds the lead In the pencil, a connector is attached to the rear part of the chuck, a core tank is connected to the connector, an inner collar is formed at the front part of the shaft tube, and the core tank and the connector can be inserted into the inner casing. An inner collar is formed on the inner surface of the sheath removably connected to the shaft tube, the core inserted from the front of the sheath and the pressing member inserted from the rear of the sheath are connected, and the sheath and the pressing member The pressing member is urged rearward in the longitudinal direction by a return spring stretched between them, and a projection is formed at a substantially middle portion of the cylindrical portion extending rearward from the outer casing while forming an outer casing in the coupling tool. , Inside the barrel Engaged by the coupling of the outer collar and barrel projection of coupling the inner flange in the insertion of further distances from the distance S4 in the sheath and pressing member minus the distance S2 of the pressing member and the lead tank The second gist is that the separation distance S3 between the connector and the connector is set longer.

  The present invention locks the inner collar formed on the front part of the shaft cylinder with the outer collar and the protrusion of the coupling tool, so that the mechanism part does not come off the shaft cylinder even when the base is removed from the shaft cylinder. There is an effect that the lead stored in the lead tank does not fall or be discharged from the lead tank.

  Even if the base is removed to remove the broken core in the base, the mechanical part does not come off from the shaft tube, and a swing-out mechanical pencil that does not cause the core in the core tank to drop or be discharged is realized.

  Hereinafter, based on FIG.1, FIG.2, FIG.3, FIG.4, FIG.5, FIG.6 and FIG. 7, the swing-out type mechanical pencil of Example 1 in this invention is demonstrated. In addition, let the left side of FIG. 1 be the front, and let the right side be back. First, a polyacetal connector 2 is press-fitted and fixed to the rear part of a metal chuck 1 made of brass or the like. As shown in FIGS. 2 and 3, the connector 2 protrudes on both sides at a substantially intermediate portion and cuts up and down to form a base portion 2A. Two elastic pieces 2B are formed by extending approximately 45 degrees in the circumferential direction from the base portion 2A, and a protruding portion 2C protruding rearward in the longitudinal direction is formed at the tip of each elastic piece 2B. Further, two outer casings 2D having a front surface vertical and a rear surface inclined are formed at the rear portion of the connector 2. The rear part of the connector 2 is press-fitted and fixed to the front part of the core tank 3 made of polypropylene pipe material.

  Further, a fastener 4 is fitted on the head 1 </ b> A of the chuck 1, and a spring 6 is stretched between the connector 5 that receives the fastener 4 and the connector 2. As shown in FIGS. 1 and 4, the connector 5 has an outer flange 5A and an inner flange 5B formed at the front, and a protrusion 5D above and below a substantially intermediate portion of the cylindrical portion 5C extending rearward from the outer flange 5A. Form. Moreover, the opening part 5E is formed in the both sides of the cylinder part 5C, and the cylinder part 5C which provided the protrusion 5D is comprised so that bending is possible.

  An inner flange 7A is formed at the front portion of the shaft cylinder 7, and the core tank 3 and the connector 2 can be inserted into the inner flange 7A. Further, a non-slip rubber grip 8 is externally fitted to the front narrow diameter portion 7B of the shaft cylinder 7. The core tank 3 is inserted from the front side of the shaft cylinder 7, and the protrusion 5D is inserted into the inner flange 5B while bending the cylinder portion 5C of the connector 5, and the outer flange 5A and the protrusion 5D of the connector 5 The inner collar 7A of the shaft cylinder 7 is locked. Further, the distance from the rear end of the connector 5 to the elastic piece 2B of the connector 2 is separated by the dimension of S3. Further, a non-slip rubber grip 8 is externally fitted to the front narrow diameter portion 7B of the shaft cylinder 7. A base 9 is detachably screwed into the shaft cylinder 7, and an outer rod 5 </ b> A of the connector 5 is held by an inner stage 9 </ b> A of the base 9 screwed into the front end of the shaft cylinder 7 and the front portion of the shaft cylinder 7. Further, the rubber grip 8 is held between the rear end of the base 9 and the outer stage 7 </ b> C of the shaft cylinder 7. The base 9 contains a core holder 11 made of an elastic body such as rubber that holds the core 10 with an appropriate force.

  The weight body 12 is composed of a metal cylinder, and the weight body 12 is slidably incorporated in an inner hole opened from the rear end of the shaft cylinder 7. The core tank 3 is inserted into the through hole of the weight body 12.

  The head crown 13 is integrally formed with the clip 14 on the upper side, and a small-diameter portion 13A is formed at the front portion. Protrusions 13B are formed on the outer peripheral surface of the small-diameter portion 13A so as to be located immediately below the clip 14, and open windows 13C extending in the longitudinal direction are formed on both sides of the small-diameter portion 13A so as to face each other. The small-diameter portion 13A where 13B is located is configured to be appropriately elastically deformable. The head crown 13 is formed with an inner collar 13D for preventing the horizontal swing of the core tank 3 inside the front part, and a step part 13E for abutting the return spring 15 inside the rear part. . Further, a key groove 13F is formed above and below the rear hole of the head crown 13 at a position shifted by 90 degrees with respect to the opening window 13C and the axial center.

  Further, projections 16B are formed on both sides of the outer peripheral surface of the front cylinder 16A of the pressing member 16, and front windows 16C are formed on the top and bottom of the front cylinder 16A so as to face each other, and the projections 16B are located. 16A 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 protruding outward from the projection 16B at positions shifted 90 degrees in the circumferential direction are respectively provided above and below the outer flange portion 16D. It is formed. Further, an inner flange 16G having a core insertion hole 16F is formed on the inner surface of the pressing member 16, and the front surface of the inner flange 16G is a pressing surface that presses the rear end of the core tank 3. After the return spring 15 is fitted on the front portion of the pressing member 16, the key 16E of the pressing member 16 is inserted into the key groove 13F of the crown 13 from the rear of the crown 13, and the protrusion 16B of the pressing member 16 is inserted. Is loosely fitted in the opening window 13C of the head crown 13 so as to be slidable in the longitudinal direction. Further, the return spring 15 is stretched between the step portion 13E of the head crown 13 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. In this state, the distance from the keyway 13F front edge 13G of the head crown 13 to the key 16E of the pressing member 16 is separated by the dimension of S1.

  Further, an eraser 17 is fitted and attached to the rear inner hole 16H of the pressing member 16, and a knob 18 covering the eraser 17 is fitted to the rear outer surface 16I of the pressing member 16.

  The thus-assembled head crown 13 is inserted from the rear end of the shaft tube 7, and the raised portion 13H of the head crown 13 is aligned with the concave groove 7D extending forward in the longitudinal direction from the rear end of the shaft tube 7, and is advanced. Then, the protrusion 13 </ b> B of the crown 13 is fitted into a locking window 7 </ b> E formed on the upper surface of the rear portion of the shaft cylinder 7, and the crown 13 is attached to the shaft cylinder 7. Moreover, the locking window 7E of the shaft cylinder 7 and the projection 13B of the head crown 13 are hidden by the clip 14, so that the appearance is not impaired. The rear portion of the core tank 3 is inserted into the inner collar 13D of the crown 13 and the weight body 12 is restricted from sliding in the longitudinal direction by the protrusion 2C of the connector 2 and the inner collar 13D of the crown 13. Is done. Moreover, the rear portion of the lead tank 3 is inserted into the front inner hole 16J of the pressing member 16, and the distance from the rear end of the lead tank 3 to the pressing surface of the pressing member 16 is separated by the dimension of S2.

  The connecting tool is obtained by subtracting the distance S2 from the rear end of the core tank 3 to the pressing surface of the pressing member 16 from the distance S1 from the key groove 13F front edge 13G of the crown 13 to the key 16E of the pressing member 16. A distance S3 from the rear end of the connector 5 to the elastic piece 2B of the connector 2 is set long.

  The swing-out mechanical pencil described above exerts an inertial force on the weight body 12 by shaking the shaft cylinder 7, and the weight body 12 comes into contact with the protrusion 2 </ b> C formed on the elastic piece 2 </ b> B of the connector 2. Then, the connector 2 moves forward while absorbing the impact force when the weight body 12 comes into contact with the elastic body by bending. Further, the chuck 1 and the lead tank 3 are moved forward together with the connector 2, and the fixed amount lead 10 is fed out.

  When a broken core is generated in the base 9, the base 9 is removed and the broken core is removed. At this time, since the mechanism portion is locked to the inner flange 7A of the shaft tube 7 by the outer flange 5A and the projection 5D of the connector 5, the mechanism portion is not likely to be detached from the shaft tube 7.

  Moreover, even if the knob 18 is accidentally pressed with the base 9 removed, the rear end of the core tank 3 is determined from the distance S1 from the key groove 13F front edge 13G of the crown 13 to the key 16E of the pressing member 16. Since the distance S3 from the rear end of the connector 5 to the elastic piece 2B of the connector 2 is set longer than the distance obtained by subtracting the distance S2 from the pressing member 16 to the pressing surface of the pressing member 16, as shown in FIG. Since the key 16E of the pressing member 16 contacts the front edge 13G of the keyway 13F of the head crown 13, there is no fear that the elastic piece 2B of the connector 2 contacts the rear end of the connector 5. That is, there is no possibility that the connector 5 is pushed by the connector 2 and comes off the shaft cylinder 7.

Hereinafter, based on FIG. 9, FIG. 10 and FIG. 11, the swing-out type mechanical pencil of Example 2 in this invention is demonstrated. In addition, the same member as FIG. 1 attaches | subjects the same code | symbol, and abbreviate | omits the description. An inner collar 107A is formed at the front portion of the shaft cylinder 107, and the core tank 3 and the connector 102 are configured to be inserted through the inner collar 107A. Further, a non-slip rubber grip 108 is externally fitted to the front narrow diameter portion 107B of the shaft tube 107.

  The outer sheath 19 made of transparent resin is integrally formed with a clip 114, and an inner collar 19 </ b> A is formed at the rear portion of the outer sheath 19. In addition, an outer collar 20A is formed at the rear part of the sheath 20, and an engaging protrusion 20B is formed in front of the outer casing 20A in the longitudinal direction. Further, an inner collar 20C is formed on the inner surface of the sheath 20 slightly rearward from the intermediate portion, and two front keys 20D extending rearward in the longitudinal direction from the front end are inclined at 45 degrees in the circumferential direction from the upper and lower sides. In addition, two rear key grooves 20E that are formed opposite to each other and extend forward in the longitudinal direction from the rear end are formed opposite to each other.

  The core 21 has an inner collar 21A formed at the front part, and an opening window 21B is formed at a position opposite to the intermediate part. Furthermore, two key grooves 21C are formed on the outer surface of the core 21 at a position inclined 45 degrees in the circumferential direction from the opening window 21B.

  Two locking protrusions 116K are formed at relative positions above and below the front outer surface of the pressing member 116, and the front ends of the locking protrusions 116K are inclined. Moreover, the opening window 116C is formed in the both sides of the pressing member 116, and the front part of the pressing member 116 is formed so that bending is possible. An outer flange portion 116D is formed at the rear portion of the pressing member 116, and two keys 116E protruding outward are formed on the outer flange portion 116D so as to face each other. Further, the eraser 17 is fitted and attached to the rear inner hole 116H of the push member 116, and the knob 18 covering the eraser 17 is fitted to the rear outer surface 116I of the push member 116.

  In the core 21, the key groove 21 </ b> C of the core 21 is inserted from the front of the sheath 20 in accordance with the front key 20 </ b> D of the sheath 20. The front part of the front key 20D is formed with a narrower width as it goes forward, and has a shape that can easily enter the key groove 21C. Further, the pushing member 116 is inserted from the rear side of the sheath 20 with the key 116E of the pushing member 116 fitted into the rear key groove 20E of the sheath 20, and between the inner collar 20C of the sheath 20 and the outer collar portion 116D of the pushing member 116. The return spring 15 is stretched. When the pressing member 116 is appropriately inserted, the locking projection 116K of the pressing member 116 is engaged with and attached to the opening window 21B of the core 21. At this time, the key groove 21C of the core 21 is aligned with the front key 20D of the sheath 20, and the key 116E of the pressing member 116 is aligned with the rear key groove 20E of the sheath 20, so that the locking projection 116K of the pressing member 116 is The core 21 is securely fitted into the opening window 21 </ b> B. Therefore, the locking protrusion 116K of the pressing member 116 is normally locked to the opening window 21B of the core 21. In this state, the distance from the rear keyway 20E front edge 20F of the sheath 20 to the key 116E of the pressing member 116 is separated by the dimension of S4.

  The sheath 20 is inserted into the outer sheath 19 from the rear, and the engagement protrusion 20B of the sheath 20 is engaged with the inner collar 19A of the outer sheath 19.

  The core tank 3 is inserted from the front side of the shaft tube 107, and the protrusion 5D is inserted into the inner flange 107A while bending the cylinder portion 5C of the connector 5, and the outer flange 5A and the protrusion 5D of the connector 5 are inserted. The inner collar 107A of the shaft tube 107 is locked. Further, the distance from the rear end of the connector 5 to the outer casing 102D of the connector 102 is separated by the dimension of S3. A base 109 is detachably screwed onto the shaft tube 107, and the outer collar 5 </ b> A of the connector 5 is held by the inner stage 109 </ b> A of the base 109 screwed to the front end of the shaft tube 107 and the front portion of the shaft tube 107. Further, the rubber grip 108 is held by the rear end of the base 109 and the outer stage 107 </ b> C of the shaft tube 107. The base 109 contains a core holder 11 made of an elastic body such as rubber that holds the core 10 with an appropriate force.

  The weight body 12 is slidably incorporated in the shaft tube 107 from the rear end of the shaft tube 107. The core tank 3 is inserted into the through hole of the weight body 12.

  Next, the sheath 20 is detachably screwed onto the shaft tube 107, and the outer sheath 19 is held by the outer rod 107F of the shaft tube 107 and the outer rod 20A of the sheath 20. The weight body 12 built in the shaft cylinder 107 is configured to be slidable in the longitudinal direction between the outer collar 102D of the connector 102 and the inner collar 21A of the core 21. Moreover, the rear portion of the lead tank 3 is inserted into the front inner hole 116J of the pressing member 116, and the distance from the rear end of the lead tank 3 to the pressing surface of the pressing member 116 is separated by the dimension S2.

  The connecting tool is obtained by subtracting the distance S2 from the rear end of the core tank 3 to the pressing surface of the pressing member 116 from the distance S4 from the front edge 20F of the rear keyway 20E of the sheath 20 to the key 116E of the pressing member 116. 5, a distance S3 from the rear end of the connector 102 to the outer casing 102D of the connector 102 is set long.

  In the above-described swing-out type mechanical pencil, when a broken core is generated in the base 109, the base 109 is removed to eliminate the broken core. At this time, since the mechanism portion is locked to the inner flange 107A of the shaft tube 107 by the outer flange 5A and the projection 5D of the connector 5, the mechanism portion is not likely to be detached from the shaft tube 107. Moreover, even if the knob 18 is accidentally pressed with the base 109 removed, the rear end of the core tank 3 is determined from the distance S4 from the rear keyway 20E front edge 20F of the sheath 20 to the key 116E of the pressing member 116. Since the distance S3 from the rear end of the connector 5 to the outer rod 102D of the connector 102 is set longer than the distance obtained by subtracting the distance S2 from the pressing member 116 to the pressing surface of the pressing member 116, as shown in FIG. There is no possibility that the key 116E of the pressing member 116 contacts the front edge 20F of the rear keyway 20E of the sheath 20 and the outer flange 102D of the connector 102 contacts the rear end of the connector 5. That is, there is no possibility that the connector 5 is pushed by the connector 102 and comes off the shaft tube 107.

  In addition, since there is no fear that the mechanism portion is detached from the shaft tube 107, there is no need to worry about erroneous operation such as inserting the detached mechanism portion from the rear of the shaft tube 107 with the sheath 20 removed. It is.

  In each of the above embodiments, an opening window is formed in the tube portion of the connector so that the tube portion can be bent. However, the present invention is not limited to the above embodiment and is not illustrated. However, you may comprise so that it can bend by forming a notch groove from the rear end in the both sides of the cylinder part of a connector. Further, if the cylindrical portion of the connector can be bent, the object and effects of the present invention can be achieved without forming an opening window or a notch groove.

  In the swing-out mechanical pencil that is attached by inserting the core tank and the connector from the front of the shaft tube, it can be applied to the swing-out mechanical pencil in which the connector is not detached from the shaft tube even when the base is removed.

It is sectional drawing which shows the swing-out type mechanical pencil of Example 1 of this invention. Example 1 It is an enlarged front view which shows the connector of FIG. Example 1 It is an expanded sectional view which shows the AA line of FIG. (Example 1) It is sectional drawing which shows the coupling tool of FIG. Example 1 It is an expanded sectional view which shows the AA line of FIG. Example 1 It is an expanded sectional view which shows the BB line of FIG. Example 1 It is an expanded sectional view which shows the CC line of FIG. Example 1 It is sectional drawing which shows the state which removed the nozzle | cap | die and knocked in the swing-out type mechanical pencil of Example 1. FIG. Example 1 It is sectional drawing which shows the swing-out type mechanical pencil of Example 2 of this invention. (Example 2) It is an expanded sectional view which shows the AA line of FIG. (Example 2) It is an expanded sectional view which shows the BB line of FIG. (Example 2) In the swing-out type mechanical pencil of Example 2, it is sectional drawing which shows the state which removed the nozzle | cap | die and knocked. (Example 2)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chuck 2 Connector 3 Core tank 4 Fastening tool 5 Connecting tool 5A Outer side of connecting tool 5C Cylinder part of connecting tool 5 5D Projection part of connecting tool 5 Spring 7 Shaft cylinder 7A Inner side of shaft cylinder 10 Core 12 Weight Body 13 Crown 15 Return spring 16 Pushing member 20 Sheath 20C Inner collar 21 of the sheath 20 Core 107 Shaft cylinder 107A Inner collar 116 of the axle cylinder 107 Pushing member

Claims (2)

In a swing-out mechanical pencil that consists of a chuck, a fastener that opens and closes the chuck, a spring that biases the chuck rearward, and a coupling that receives the fastener, and that advances the chuck by the inertial force of the heavy body and feeds the lead In addition, a connector is attached to the rear part of the chuck, a core tank is connected to the connector, and an inner flange is formed at the front part of the shaft cylinder, and the core tank and the connector are inserted into the inner casing. A head crown is attached to the shaft cylinder, and a push member is incorporated in the crown so as to be slidable in the longitudinal direction, and the push member is moved rearward in the longitudinal direction by a return spring stretched between the crown and the push member. Further , an outer casing is formed on the coupling tool and a protrusion is formed at a substantially middle portion of the cylindrical section extending rearward from the outer casing. The inner casing of the shaft cylinder is connected to the outer casing of the coupling tool and the shaft cylinder. Connecting through the inner cage Engaged by the projections, further that from the distance obtained by subtracting the distance S2 of the pressing member and the lead tank from distance S1 of Atamakanmuri and pressing member, towards the connector and connector of the distance S3 is set to be longer A swing-out mechanical pencil characterized by In a swing-out mechanical pencil that consists of a chuck, a fastener that opens and closes the chuck, a spring that biases the chuck rearward, and a coupling that receives the fastener, and that advances the chuck by the inertial force of the heavy body and feeds the lead In addition, a connector is attached to the rear part of the chuck, a core tank is connected to the connector, and an inner flange is formed at the front part of the shaft cylinder, and the core tank and the connector are inserted into the inner casing. An inner collar is formed on the inner surface of the sheath that is detachably connected to the shaft cylinder, and the core inserted from the front of the sheath and the pressing member inserted from the rear of the sheath are connected, and the sheath and the pressing member are connected. The pushing member is urged rearward in the longitudinal direction by a stretched return spring, and a projection is formed at a substantially intermediate portion of the cylindrical portion that extends rearward from the outer casing while forming an outer casing on the connector. Connect the inner collar of the tube Engaged by projections of the connector inserted through the inner flange in the outer flange and the barrel of the tool, further than the distance from the distance S4 in the sheath and pressing member minus the distance S2 of the pressing member and the lead tank, A swing-out mechanical pencil characterized in that the distance S3 between the connector and the connector is set longer.

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