JP5705653B2 - Swing-out mechanical pencil - Google Patents

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, a weight body externally fitted to a core tank is moved back and forth between a front abutment body and a back abutment body that abut on a weight body provided on the front side and the rear side of the weight body by shaking a shaft cylinder. Is known as a swing-out mechanical pencil capable of feeding a lead housed in a lead tank connected to the chuck by abutting the front abutting body material and advancing the chuck. When the tube is shaken, the front abutting body and the rear abutting body abut on each other, so that there is a problem that an impact sound is generated.

  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

  A problem to be solved by the present invention is that a front body and a rear body that are in contact with a weight body provided on the front side and the rear side of the weight body by shaking a shaft cylinder with a weight body externally fitted to the core tank. A swing-out mechanical pencil that can feed out the core stored in the core tank connected to the chuck by advancing the back and forth, abutting the weight body against the front contact body material, and moving the chuck forward, with a simple structure Easily assembled, and by adding a new member to the structure of the conventional swing-out mechanical pencil, when the shaft tube is shaken, the impact at the time of contact with the rear contact body material of the weight body is reduced. The object is to obtain a swing-out mechanical pencil that absorbs and reduces impact sound.

The present invention
“1. The weight body externally fitted to the core tank is moved back and forth between the front contact body and the rear contact body that are in contact with the weight body provided on the front side and the rear side of the weight body by shaking the shaft cylinder. In a swing-out mechanical pencil capable of feeding a lead housed in a lead tank connected to the chuck by abutting the body against the front abutment body, at least the rear abutment body is arranged on the outer periphery of the lead tank. An elastic piece protruding inward from the inner wall surface is provided on the inner wall surface of the shaft cylinder facing the surface or the member mounted in the shaft cylinder, and the elastic body is elastic when the weight body contacts the rear abutting body. A swing-out mechanical pencil characterized in that the shock can be absorbed by bending the piece backward.
2. 2. The swing-out mechanical pencil according to claim 1, wherein a protrusion projecting toward the front contact body is formed on a surface of the elastic piece on the front contact body side.
3. 3. The swing-out mechanical pencil according to item 1 or 2, wherein the front contact body is provided with an elastic body such as an O-ring on the outer peripheral surface of the member connected to the chuck, or the shaft diameter is provided on the outer peripheral surface of the member. A swing-out mechanical pencil formed by providing elastic pieces extending in the direction. "
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 to reduce the impact sound, but the material of the rear abutment body is not particularly limited, but it must be made of a material or shape that can be bent backward.

  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 the structure as described above, when the weight body contacts the rear contact body, the elastic piece of the rear contact body bends backward to absorb the impact of the weight body. The impact sound generated when the body and the rear abutting body come into contact can be reduced. Compared to the manufacturing cost of the conventional swing-out mechanical pencil, the structure is simple and easy to assemble because the member has a new shape and a rear abutting body compared to the conventional swing-out mechanical pencil. , There is an advantage of not so high.

  By making it the invention which concerns on Claim 2, the elastic piece of a back contact body becomes easy to bend back, and since it becomes easy to absorb the impact by a weight body, an impact sound can be reduced more.

  By setting it as the invention which concerns on Claim 3, 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 saved. FIG. 2 is an enlarged lateral end view in which a clip portion of a BB line portion in FIG. 1 is saved. It is an enlarged front view of the connector which provided the front contact body in the Example of FIG. It is an expansion horizontal end view of the CC line part in FIG.

  The weight body externally fitted to the core tank is moved back and forth between the front contact body and the rear contact body that abuts 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 the lead housed in the lead tank connected to the chuck by advancing the chuck while coming into contact with the contact body material, when the rear contact member comes into contact with the weight body The portion that contacts the weight body constituting the rear abutting body is provided so as to bend backward to absorb the impact at the time of the abutting.

  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. 3). The inner cylindrical portion 15b at the front end of the guide hole 16 is formed with a ring-shaped flange portion 17 protruding outward on the outer peripheral surface, and the flange portion 17 abuts against the inner wall surface of the shaft tube 2. Thus, rattling in the axial direction of the inner cylinder portion 15b is suppressed. Further, a protrusion 18 is provided on the outer peripheral surface of the flange portion 17 at a position facing the clip 14, and the protrusion 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.

  Further, as shown in FIG. 2, the inner wall surface of the inner cylinder portion 15 b facing the outer peripheral surface of the core tank 5 protrudes inward and is circumferentially spaced from the outer peripheral surface of the core tank 5. A rear abutting portion 21 composed of two opposing elastic pieces 20 which are extended in an integrated manner is provided integrally. At the tip of each elastic piece 20, a protrusion 22 protruding forward in the axial direction is formed. The weight body 12 has an outer diameter that can move in the inner cylinder portion 15b and can contact the protrusion 22 of the rear contact body 21. When the weight body 12 moves backward by shaking the shaft body 2, Is in contact with the protrusion 22 and the elastic piece 20 bends backward to absorb the impact at the time of contact.

  Similar to a conventional swing-out mechanical pencil, a main body portion provided with an eraser insertion portion 23 and a bottom portion 25 having an insertion hole 24 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 come into contact. 26 is inserted from the outer cylinder portion 15a side of the crown 15 with the main body portion 26 facing the core tank 5 side, and the main body portion 26 is positioned behind the rear abutment body 21. The locking projection 33 formed on the outer peripheral surface of the main body portion 26 is locked to the guide hole 16 formed in the inner cylinder portion 15 b of the crown 15, and the locking projection 28 constitutes the guide hole 16. The knock body 27 is provided so as not to come out of the head crown 15 by contacting the end 15ba of the inner cylinder portion 15b on the rear end side. The main body portion 26 is provided with a slit 29 so that the main body portion 26 can be inserted into the inner cylinder portion 15b so that the diameter can be reduced (see FIG. 3). A spring receiving portion 30 is formed on the outer peripheral surface of the eraser insertion portion 23 so as to protrude in a circumferential shape. Between the spring receiving portion 30 and a step portion 31 formed by a difference in inner diameter of the head crown 15. The knock body 27 is urged backward by stretching the spring 32.

  An eraser 33 is inserted into the eraser insertion portion 23 and a cap 34 whose front end is in contact with the spring receiving portion 30 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 abuts on the rear abutment body 21, as with the front abutment body 13, it is absorbed by the elastic piece 20, so that the impact sound at that time 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 20 Elastic piece 21 Back contact body 22 Protrusion 27 Knock body

Claims (3)

  The weight body externally fitted to the core tank is moved back and forth between the front contact body and the rear contact body that abuts the weight body provided on the front side and the rear side of the weight body by shaking the shaft cylinder. In a swing-out mechanical pencil capable of feeding out the lead stored in the lead tank connected to the chuck by abutting against the abutment body, at least the rear contact member is opposed to the outer peripheral surface of the lead tank. An elastic piece projecting inward from the inner wall surface is provided on the inner wall surface of the shaft cylinder or the member mounted in the shaft cylinder, and the elastic piece is rearward when the weight body comes into contact with the rear contact body. A swing-out mechanical pencil characterized in that it can absorb shocks by bending.   The swing-out type mechanical pencil according to claim 1, wherein a protrusion projecting toward the front contact body is formed on a surface of the elastic piece on the front contact body side.   3. The swing-out mechanical pencil according to claim 1 or 2, wherein the front abutting body is provided with an elastic body such as an O-ring on an outer peripheral surface of a member connected to the chuck, or an axial radial direction is provided on the outer peripheral surface of the member. A swing-out mechanical pencil that is formed by providing an elastic piece that stretches on the surface.

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