JP2012240406A - Shaking-out type mechanical pencil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce impact sound generated by abutting of a weight body on a rear abutting body when shaking a barrel, in a shaking-out type mechanical pencil capable of feeding a core stored in a core tank connected continuously to a chuck by longitudinally moving a weight body externally fitted to a core tank between a front abutting body and a rear abutting body arranged on the front side and the rear side of the weight body and abutting on the weight body by shaking a barrel, and making the weight body abut on the front abutting body to advance the chuck.SOLUTION: A rear abutting body 25 is formed to be externally fittable to a core tank 5. In a barrel 2, the rear abutting body 25 is externally fitted to the rear end of the core tank 5 to be incapable of advancing and capable of retracting with respect to the core tank 5 and the barrel 2. A spring 36 is extendedly installed between the rear abutting body 25 and a knock body 32. When the weight body 12 abuts on the rear abutting body 25, the rear abutting body 25 retracts and thereby absorbs impact force received from the weight body 12 to reduce impact sound.

Description

  The present invention relates to a swing-out type mechanical pencil that swings a shaft cylinder and moves a weight body externally fitted to a lead tank back and forth so that a chuck connected to the lead tank moves forward and feeds the lead stored in the lead tank. .

  Conventionally, by advancing the chuck by knocking the knock body, the front body abuts the weight body fitted on the core tank with the weight body provided on the front side and the rear side of the weight body by shaking the shaft cylinder. A swing-out mechanical pencil that can feed out the core housed in the core tank connected to the chuck by moving the body back and forth between the body and the back contact body and advancing the chuck by contacting the weight body with the front contact body material However, since the weight body abuts on the front abutting body and the rear abutting body when the shaft tube is shaken, there is a problem that an impact sound is generated at that time.

  By the way, the front abutting body is fixed to a connector, a core tank, etc. connected to the chuck so that the chuck constituting the feeding mechanism for feeding the core advances when the weight body abuts. And a lead tank can be moved forward. For this reason, the front abutting body absorbs a little impact when the weight body abuts, whereas the rear abutting body is a knock-type feeding mechanism for feeding the core in the core tank. For example, when the front end portion of the knock body is used as the rear contact body, the knock body is provided so as not to move backward even if the weight body contacts. The impact at the time of contact is not absorbed, and the knock body is made of a hard synthetic resin, so that a large impact sound is generated.

  As a structure for reducing the impact sound at the time of contact between the rear contact body and the weight body, weight receiving members are arranged before and after the core feeding mechanism, and elastic bodies are provided on the weight receiving members, respectively. Japanese Patent Application Laid-Open No. 2010-52214 proposes a technique for reducing impact sound by placing a weight (weight body) between provided bullet bodies and absorbing an impact by the weight (weight body) with an elastic body. As a specific structure, a concave portion 12a is formed at the lower end of the inner surface of the knock member 12 on the rear side of the weight body (weight body), and the seat portion 20C of the weight body 20 abuts on the concave portion 12a. A structure for fixing an elastic body 22 such as an O-ring to be detached is disclosed.

  However, in the structure described above, the impact force of the weight body increases and decreases depending on the weight of the weight body and the speed at which the shaft tube is swung, and the amount of deformation of the elastic body when the weight body abuts on an elastic body such as an O-ring also changes. To do. Particularly, in the structure in which the recess 12a is formed at the lower end of the inner surface of the knock member 12 and the elastic body 22 is fixed to the recess 12a, the shape of the elastic body cannot be made large, and depending on the magnitude of the impact force There is a problem that the elastic body 22 is deformed too much and the weight body comes into contact with the lower end of the inner surface of the knock member 12 and the impact sound cannot be made very small. Moreover, in order to solve the problem, it is necessary to consider the weight of the weight body, the shape of the elastic body, the material, and the like, which is troublesome in design.

In addition, as a structure for reducing the impact sound at the time of contact between the other rear contact body and the weight body, Japanese Utility Model Laid-Open No. 55-2611 discloses a ring 20 around the rear end of the core case (core tank) 18. The spring S ₂ is fixed to the outer periphery of the core case 18 in front of the ring 20, the rear end of the spring S ₂ is attached to the ring 20, and when the weight 19 is retracted, the spring S ₂ comes into contact with the spring S _2. A technique for preventing impact noise caused by the weight 19 is disclosed. In this structure, it is necessary to provide a ring 20 for fixing the spring S ₂ and said spring S ₂ for newly soften the impact noise to other springs constituting the core feeding mechanism, to provide a new two members It will be. In addition, when the impact due to the weight 19 is repeatedly applied to the ring 20, the ring 20 may move. If an adhesive is used so that the ring 20 does not move, problems of bothering and certainty of the bonding process occur. Even if other means are used, troublesome manufacturing will occur.

JP 2010-52214 A Japanese Utility Model Publication No. 55-2611 Japanese Patent No. 4293803

  The problem to be solved by the present invention is that the knock body is knocked to advance the chuck, and the weight body externally fitted to the core tank is provided on the front side and the rear side of the weight body by shaking the shaft cylinder. The core accommodated in the core tank connected to the chuck is moved forward and backward between the front contact body and the rear contact body that contact the weight body, and the weight body is contacted to the front contact body material to advance the chuck. The swing-out mechanical pencil can be easily assembled with a simple structure, and by adding a new member to the structure of the conventional swing-out mechanical pencil, The object of the present invention is to obtain a swing-out type mechanical pencil capable of absorbing an impact at the time of contact with the rear contact body material and reducing an impact sound.

The present invention
“1. By knocking the knock body and moving the chuck forward, the weight body that is externally fitted to the core tank is shaken by the shaft cylinder, and the front contact that abuts the weight body provided on the front and rear sides of the weight body. A swing-out mechanical pencil that can feed out the core housed in the core tank connected to the chuck by moving the contact body and the back contact body back and forth, abutting the weight body against the front contact body and moving the chuck forward The rear abutting body is formed to be externally fitted to the lead tank, and is arranged to be fitted to the rear end of the lead tank so as not to be able to move forward with respect to the lead tank and the shaft tube, A spring is stretched between the rear abutting body and the knocking body is urged forward, and the rear abutting body can be retracted when the weight body abuts on the rear abutting body. A swing-out mechanical pencil.
2. In the swing-out mechanical pencil according to the item 1, the front abutting body is provided by providing an elastic body such as an O-ring on the outer peripheral surface of the member connected to the chuck, or the outer peripheral surface of the member extends in the axial radial direction. A swing-out mechanical pencil formed by providing an elastic piece. "
It is.

  The swing-out type mechanical pencil of the present invention is provided so that the rear abutting body is retracted when the weight body abuts on the rear abutting body by shaking the shaft tube. The impact sound at the time of contact is absorbed and the impact sound is reduced. However, the shape of the rear abutting body is not particularly limited, and can be externally fitted to the rear end portion of the core tank so that the weight body is applied. Any shape may be used as long as the spring can be stretched between and in contact with the knock body. Also, the material is not particularly limited, and the rear abutting body may be formed of natural rubber or synthetic rubber in terms of further reducing impact sound.

  Further, in the present invention, it is preferable to reduce the impact sound at the time of contact even when the weight body contacts the front contact body. The receiving member is fixed to the outer peripheral portion of the member connected to the chuck as disclosed in the aforementioned Japanese Patent Application Laid-Open No. 2010-52214, and the outer receiving member comes into contact with / disengages from the front end portion of the weight body. An elastic body such as a ring may be fixed, or as disclosed in Japanese Patent No. 4293803, an elastic piece extending in the circumferential direction from the base is formed on a synthetic resin member connected to the chuck. And it is good also as a structure which formed and provided the protrusion which protruded in the longitudinal direction back at the front-end | tip part of an elastic piece.

  Since the swing-out mechanical pencil of the present invention has a structure as described above, when the weight body comes into contact with the rear contact body, the rear contact body moves backward via the spring and absorbs the impact by the weight body. The impact sound generated when the weight body and the rear contact body come into contact with each other can be reduced. In addition, since the rear abutting body is urged forward by using a spring that urges the knock body backward in the conventional swing-out mechanical pencil, there is no need to provide a new spring, and a rear member is provided as a new member. Since only the abutting body is provided and the structure is simple and easy to assemble, there is an advantage that the cost is not so high as compared with the manufacturing cost of the conventional swing-out mechanical pencil.

  By setting it as the invention which concerns on Claim 2, since the impact sound generated at the time of contact | abutting of a weight body and a front contact body is also reduced, an impact sound can be reduced further.

It is a longitudinal cross-sectional view of the swing-out type mechanical pencil which cut the principal part which shows the Example of the swing-out type mechanical pencil of this invention. FIG. 2 is an enlarged lateral end view in which a clip portion of an AA line portion in FIG. 1 is omitted. FIG. 2 is an enlarged lateral end view in which a clip portion of a BB line portion in FIG. 1 is omitted. FIG. 2 is an enlarged lateral end view in which a clip portion of a CC line portion in FIG. 1 is omitted. The rear contact body in the Example of FIG. 1 is shown, (a) is the enlarged plan view which looked at the rear contact body from the top, (b) is the enlarged front view of a back contact body. 1 shows a rear abutting body in the embodiment of FIG. 1, wherein (a) is an enlarged left side view of the rear abutting body viewed from the front side (left side in the figure), and (b) is a rear abutting body on the rear side. It is the expansion right view seen from (right side in a figure). It is an enlarged front view of the connector which provided the front contact body in the Example of FIG. It is an enlarged horizontal end view of the DD line part in FIG.

  A front abutting body that knocks the knock body and advances the chuck, and abuts the weight body fitted on the core tank with the weight body provided on the front side and the rear side of the weight body by shaking the shaft cylinder; In the swing-out mechanical pencil capable of feeding out the core accommodated in the core tank connected to the chuck by moving the back and forth between the back and front bodies, abutting the weight body against the front contact body material and moving the chuck forward, The rear abutting body is provided so as to retreat upon contact with the weight body so as to absorb an impact at the time of contact.

  An embodiment of the swing-out mechanical pencil of the present invention will be described with reference to the drawings. In the drawing, the left side is the front and the right side is the rear. As an example of the swing-out mechanical pencil of the present invention, in the case of a structure in which a crown that is integrally formed with a clip as seen in a conventional swing-out mechanical pencil is inserted at the rear end of the shaft cylinder. Although described, it is not limited to this structure. The swing-out mechanical pencil 1 of the present embodiment, like the conventional swing-out mechanical pencil, has a connector 4 press-fitted and fixed in the rear portion of the chuck 3 in the shaft cylinder 2, and a core made of a pipe material at the rear portion of the connector 4. The tank 5 is connected and accommodated. A tightening ring 6 is fitted on the head 3 a of the chuck 3, and a spring 8 is stretched between a connector 7 that receives the tightening ring 6 and the connector 4.

  The connector 7 is sandwiched between the front end of the shaft tube 2 and the inner stage 9a of the base 9 screwed to the front end of the shaft tube 2, and the base 9 is made of synthetic rubber or the like that holds the core 10 with an appropriate force. A core holder 11 formed of an elastic body is incorporated.

  A weight body 12 formed in a cylindrical shape by winding a thin metal wire in a coil shape is externally fitted to the core tank 5 so as to be slidable with respect to the core tank 5. The weight body 12 is not limited to this, and the impact force at the time of abutting with the front abutting body 13 formed on the connector 4 for preventing the weight body 12 from abutting and moving forward. In order to soften, although not shown in the figure, the weight body 12 may have a structure having a spring portion formed by separating adjacent metal thin wires at the front end portion and the rear end portion of the weight body 12. May be a structure having a metal cylinder.

  As shown in FIGS. 7 and 8, the connector 4 includes elastic pieces 4 b that are provided at two opposite positions of the base 4 a that is substantially in the middle of the connector 4, and that extend circumferentially from the base 4 a in the circumferential direction. A front abutment configured to prevent the forward movement of the weight body 12 by the projection 4c formed by projecting toward the rear in the axial direction at the tip of each elastic piece 4b. A body 13 is provided. When the weight body 12 comes into contact with the front contact body 13, the impact force at the time of contact is absorbed by the flexure of the elastic piece 4b, and the chuck 3 and the lead tank 5 are advanced to advance the lead tank 5. A certain amount of the core 10 accommodated therein can be fed out. In addition, two outer casings 4d having a front surface perpendicular to the rear surface and an inclined rear surface are provided at the rear portion of the connector 4 so that they can be press-fitted and fixed to the front portion of the core tank 5.

  In this embodiment, the front abutting body 13 is formed as described above. However, although not shown, a structure in which an elastic body such as an O-ring is attached to the outer peripheral surface of the connector 4 may be used. However, when the weight body 12 comes into contact with the front contact body 13, it is necessary to adhere to the outer peripheral surface of the connector 4 so that the chuck 3 and the core tank 5 are advanced.

  At the rear end of the shaft cylinder 2, a head crown 15 formed by integrally forming a clip 14 is inserted so as to be seen in a conventional swing-out mechanical pencil. The head crown 15 includes an outer cylinder portion 15 a that protrudes outward from the rear end of the shaft tube 2 and has a clip 14, and an inner tube portion 15 b that is inserted into the rear end portion of the shaft tube 2. The inner diameter of the outer cylinder part 15a is formed larger than the inner diameter of the inner cylinder part 15b. Guide holes 16 extending in the front-rear direction communicating with the inside and outside of the inner cylinder portion 15b are formed at two opposing positions of the inner cylinder portion 15b (see FIG. 2). A ring-shaped flange portion 17 protruding outward is formed on the outer peripheral surface of the inner cylinder portion 15 b at the front end of the guide hole 16, and the flange portion 17 abuts on the inner wall surface of the shaft tube 2. Further, rattling in the axial diameter direction of the inner cylinder portion 15b is suppressed. Further, a protruding portion 18 is provided on the outer peripheral surface of the flange portion 18 at a position facing the clip 14, and the protruding portion 18 is formed on the inner wall surface of the shaft tube 2 and is engaged with a guide groove 19 having an open rear end. Although not shown in the drawing, the projection formed on the outer peripheral surface of the inner cylinder portion 15b can be easily locked in the locking hole formed in the rear end portion of the shaft cylinder 2, and the shaft cylinder 2 so that the crown 15 does not rotate or disengage.

  As shown in FIGS. 5 and 6, a front flange portion 21 having an insertion hole 20 through which the core tank 5 can be inserted, and an insertion hole 22 having a diameter larger than the insertion hole 20 and an outer diameter from the front flange portion 21. A rear abutment body 25 formed by connecting two opposing portions with a rod-shaped coupling body 24 and a rear flange portion 23 having a large diameter, and the front flange portion 21 side facing the chuck 3 side. Inserted from the outer cylinder part 15a side, the connecting body 24 is loosely fitted into the guide hole 16, and the rear flange part 23 is inserted in contact with the step part 26 formed by the inner diameter difference in the outer cylinder part 15a of the crown 15. It is. A through groove 27 that communicates the inside of the guide hole 16 and the outer cylinder part 15a is formed in the inner cylinder part 15b and the outer cylinder part 15a behind the guide hole 16 formed in the inner cylinder part 15b. Can be arranged in the crown 16 without bending (see FIG. 3).

  Similar to a conventional swing-out mechanical pencil, a main body provided with an eraser insertion portion 28 and a bottom portion 30 having an insertion hole 29 into which the rear end portion of the lead tank 5 is inserted and with which the rear end of the lead tank 5 can contact. 31 is inserted from the outer cylinder 15a side of the crown 15 with the main body 31 facing the core tank 5 side, and the main body 31 is connected to the connecting body 24 of the rear abutment body 25. The locking projections 33 arranged on the inner side and formed on the outer peripheral surface of the main body 31 are locked in the guide holes 16 formed in the inner cylinder portion 15b of the crown 15, so that the locking projections 33 are guided. The knock body 32 is provided so as not to come out of the head crown 15 by abutting against the end portion 15ba of the inner cylinder portion 15b on the rear end side constituting the hole 16 (see FIG. 3). The main body 31 is provided with a slit 34 so that the main body 31 can be inserted into the rear abutting body 25 (see FIG. 3). A spring receiving portion 35 is formed on the outer peripheral surface of the eraser insertion portion 28 so as to protrude in a circumferential shape. A spring 36 is stretched between the rear flange portion 24 and the spring receiving portion 35 of the rear abutment body 26. Thus, the rear abutting body 25 is urged forward and the knock body 32 is urged rearward.

  An eraser 37 is inserted into the eraser insertion portion 28, and a cap 38 whose front end is in contact with the spring receiving portion 35 is detachably covered.

  The swing-out mechanical pencil 1 of the present embodiment has an elastic piece as a front contact body 13 formed on the connector 4 by moving the weight body 12 back and forth along the core tank 5 by shaking the shaft cylinder 2. The connector 4 advances while the elastic piece 4b absorbs the impact force when the weight body 12 comes into contact with the protrusion 4c formed on the protrusion 4c, and the chuck 3 and the core tank 5 also move forward. Then, a certain amount of the core 10 accommodated in the core tank 5 is fed out. Since the impact force when the weight body 12 abuts on the front abutment body 13 is absorbed by the elastic piece 4b of the front abutment body 13, the impact sound at that time is reduced. Further, when the weight body 12 comes into contact with the rear contact body 25, the rear contact body 25 moves backward in a state of being urged forward by the spring 36. Is absorbed by the rear abutting body 26, so that the impact noise at the time of abutting is reduced.

  The present invention relates to a swing-out mechanical pencil capable of moving a shaft forward and back to move a weight body forward and backward so that a lead housed in a lead tank can be fed out. This can be applied to the case where it is desired to reduce the impact sound generated by abutting on the.

DESCRIPTION OF SYMBOLS 1 Swing-out type ball-point pen 2 Shaft cylinder 3 Chuck 4 Connector 5 Core tank 10 Core 12 Weight body 13 Front contact body 25 Back contact body 32 Knock body 36 Spring

Claims (2)

  A front abutting body that knocks the knock body and advances the chuck, and abuts the weight body fitted on the core tank with the weight body provided on the front side and the rear side of the weight body by shaking the shaft cylinder; In the swing-out type mechanical pencil capable of feeding out the core accommodated in the core tank connected to the chuck by moving the back and forth between the back and front bodies and advancing the chuck by contacting the weight body with the front contact body, The rear abutting body is formed so as to be able to fit into the lead tank, and is arranged to be fitted to the rear end of the lead tank so as not to be able to move forward with respect to the lead tank and the shaft cylinder so as to be retractable. A swing that stretches a spring and biases the rear abutment body forward and the knocking body rearward, so that the rear abutment body can be retracted when the weight body abuts on the rear abutment body. Mechanical pencil.   2. The swing-out mechanical pencil according to claim 1, wherein the front abutting body is provided by providing an elastic body such as an O-ring on an outer peripheral surface of a member connected to the chuck, or extends in an axial radial direction on the outer peripheral surface of the member. A swing-out mechanical pencil formed by providing an elastic piece.

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