JP6555948B2 - Swing-out mechanical pencil - Google Patents

Description

  The present invention pushes the contact body provided in the core feeding mechanism with the weight body advanced by swinging the shaft cylinder back and forth, and the writing core is driven by the chuck that moves forward by the advancement of the contact body. The present invention relates to a swing-out mechanical pencil that protrudes from a tip opening of a cylinder.

Conventionally, the abutting body is pushed by a weight body advanced by shaking the shaft cylinder back and forth, and the writing core protrudes from the tip opening of the shaft cylinder by the chuck that moves forward by the advancement of the contact body. The swing-out mechanical pencil equipped with the lead feeding mechanism is convenient because it can feed out the writing lead without changing the shaft tube, and is actually highly evaluated in the market.
In this swing-out type mechanical pencil, when the shaft cylinder is shaken, the weight body comes into contact with the front contact body and the rear contact body in the shaft cylinder, and an impact sound is generated, and the weight body moves back and forth. At that time, a sliding contact sound that comes into sliding contact with other members is generated.

  By the way, in patent document 1, the elastic piece is provided in the front contact body and back contact body which a weight body contacts, and when a shaft cylinder is shaken, the impact which a weight body contacts the contact body is elastic. A swing-out mechanical pencil that is absorbed by a piece and enables reduction of impact sound is described. However, in the swing-out mechanical pencil disclosed in Patent Document 1, when the weight body moves back and forth, a sliding contact sound that comes into sliding contact with other members is generated.

JP 2012-240407 A

  The problem to be solved by the present invention is to obtain a swing-out type mechanical pencil capable of reducing impact sound and sliding contact sound when the shaft tube is shaken.

The present invention
“1. The weight core that has been moved forward and backward by shaking the shaft cylinder pushes the contact body provided in the core feeding mechanism, and the chuck moves forward as the contact body moves forward. A swing-out mechanical pencil that protrudes from the tip opening of
The chuck emits bullet backward by the chuck spring is sandwiched the writing lead in the chuck at the rear of the chuck, and lead tank for accommodating the writing lead, and a connector for connecting the chuck and the lead tank, a provided on the connector An elastic piece having an abutting body with which the weight body abuts is formed , the weight body is arranged in the gap between the core tank and the shaft cylinder, and the front receiving portion provided on the outer surface of the weight body and the inner surface of the shaft cylinder are provided. arranged resilient members including coil springs between the rear receiving portion, the weight body by the elastic member made of a coil spring is resiliently forward at all times,
While forming the elastic force of the elastic member made of a coil spring lower than the elastic force of the chuck spring,
A swing-out mechanical pencil characterized by adjusting a spring constant so that a resilient member made of a coil spring does not fully compress when a weight body moves back along the core tank by swinging a shaft cylinder back and forth .
2. 2. The swing-out mechanical pencil according to 1 above, wherein a weight body is fixed to the lead tank. It is.

As described above, the swing-out type mechanical pencil of the present invention is configured such that the weight body is bounced forward from the rear by the resilient member, so that the rearward movement of the weight body is limited and the impact sound when moving backward is limited. No sliding noise with other members when moving backward, for example, sliding noise with the core tank is small, and since the moving distance is short even when moving forward, the impact noise when moving forward is also reduced. it can. The back and forth movement of the weight body is restricted and reduced by the elastic member, but since the elastic force of the elastic member is added to the inertial force when the weight body is advanced, the chuck can be advanced.
In the swing-out mechanical pencil of the present invention, since the weight body is always bulleted forward by the bullet member, the resilient force of the bullet member that bullets the chuck forward via the weight body and the contact body is It is important to set the chucking force lower than the spring force of the chuck spring that springs the chuck backward, and to hold the writing core by the chuck.

As the elastic member, a coil spring formed by winding a steel wire, or a rubber or foamed resin formed into a rod shape with elasticity can be used.
In addition, when a coil spring is used for the elastic member, when the shaft cylinder is swung back and forth, the spring constant is set so that the coil spring is fully compressed by the rearward movement of the weight body and the contact noise between the steel wires is not generated. Etc. are preferably set.

  The weight body is preferably formed in a cylindrical shape by winding a steel wire because the cylindrical shape to be fitted around the outer periphery of the core tank that houses the writing core in the shaft cylinder can stably move back and forth. Alternatively, a metal cut into a cylindrical shape or a synthetic resin injection molded into a cylindrical shape can be used.

Further, when the weight body is fixed to the core tank, the sliding contact noise between the weight body and the core tank when the shaft cylinder is shaken is not generated.
When the weight body is fixed to the core tank, the weight body will not move backward, and the force for moving the weight body from the rear to the front cannot be obtained. In the mechanical pencil, the chucking member can be advanced because the resilient member projects the weight body forward.

  According to the present invention, it is possible to obtain a swing-out mechanical pencil that can reduce the impact sound and sliding contact sound when the shaft tube is shaken.

It is a longitudinal cross-sectional view of the swing-out type mechanical pencil of a present Example.

Hereinafter, the swing-out mechanical pencil in the embodiment of the present invention will be described with reference to the drawings. Moreover, in a present Example, the side with a writing front-end | tip part is expressed as the front, and the opposite side is expressed as back. Moreover, the side close to the axial center of the shaft cylinder is expressed as inward, and the opposite side is expressed as outward.
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 to the rear portion of the chuck 3 disposed in the shaft cylinder 2, and a pipe material is connected to the rear portion of the connector 4. The core tank 5 is connected and accommodated. A fastener 6 is fitted on the head 3 a of the chuck 3, and a chuck spring 8 is stretched between the connector 7 that receives the fastener 6 and the connector 4 with an attachment load of 200 g.

  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 a synthetic rubber that holds the writing core 10 with an appropriate force. A core holder 11 formed of an elastic body such as is incorporated.

  A weight body 12 obtained by cutting metal into a cylindrical shape is externally fitted to the core tank 5 so as to be slidable with respect to the core tank 5.

  The connector 4 is provided with elastic pieces 4b extending circumferentially in the circumferential direction from the base 4a at two opposing positions of the base 4a in the substantially middle part of the connector 4. In addition, a protrusion 4c is formed at the tip of each of the two elastic pieces 4b so as to protrude rearward in the axial direction. As a result, the connector 4 is formed with an abutting body 20 for the front end of the weight body 12 to abut to prevent forward movement. When the weight body 12 comes into contact with the contact body 20, the impact force at the time of contact is absorbed by the elastic piece 4 b being bent, and the chuck 3 and the lead tank 5 are moved forward so that the inside of the lead tank 5 The writing core 10 accommodated in can be fed out.

  At the rear end of the shaft cylinder 2, a head crown 14 formed by integrally forming a clip 13 is inserted so as to be seen in a conventional swing-out mechanical pencil. The head crown 14 includes an outer cylinder portion 14 a that protrudes rearward from the rear end of the shaft cylinder 2 and has a clip 13, and an inner cylinder portion 14 b that is inserted into the rear end portion of the shaft cylinder 2. In addition, the inner hole of the outer cylinder part 14a is formed to have a larger diameter than the inner hole of the inner cylinder part 14b. A guide hole 14c is formed. Further, the inner cylinder portion 14 b is provided with a convex portion 14 d that protrudes outward. The convex portion 14 d is fitted into a locking hole 2 a formed in the shaft cylinder 2, and the crown 14 is attached to the shaft cylinder 2. It doesn't rotate or come off.

Further, a coil spring 15 is stretched as a resilient member between the front receiving portion 12a provided at the rear portion of the weight body 12 and the rear receiving portion 14e provided in the front end inner hole of the inner cylindrical portion 14b of the crown 14. The weight body 12 is bulleted forward with respect to the shaft cylinder 2.
In this embodiment, the load when the coil spring 15 is attached is 150 g, and the chuck 3 is always ejected rearward so that the writing core 10 is held between the chuck 3 by making the load smaller than 200 g when the chuck spring is attached. I have to do it.

  Similarly to the conventional swing-out mechanical pencil, the bottom portion 16c has an eraser insertion portion 16a and a front hole 16b into which the rear end portion of the lead tank 5 is inserted, and the rear end of the lead tank 5 can come into contact therewith. The knock body 16 provided and inserted is inserted from the outer tube portion 14a side of the crown 14 with the front hole 16b facing the core tank 5 side, and the front hole 16b of the rear receiving portion 14e of the crown 14 is inserted. The locking projection 16d, which is arranged so as to be positioned rearward and is formed on the outer peripheral surface of the knock body 16, is locked in the guide hole 14c formed in the inner cylinder portion 14b of the crown 14, and the locking projection 16d is guided. The knock body 16 is formed so as not to come out of the head crown 14 by contacting the rear end portion of the hole 14d. A spring receiving portion 16e is formed on the outer peripheral surface of the knock body 16 so as to protrude circumferentially. A knock spring 17 is stretched between the spring receiving portion 16e and the rear hole step portion 14f of the crown 14. The knocking body 16 is bulleted rearward.

  An eraser 18 is inserted into the eraser insertion portion 16a, and a cap 19 whose front end is in contact with the spring receiving portion 16e is detachably covered.

In the swing-out mechanical pencil 1 of this embodiment, the weight body 12 moves backward along the core tank 5 while compressing the coil spring 15 by swinging the shaft cylinder 2 back and forth. At this time, by adjusting the spring constant so that the coil spring 15 is not fully compressed, the steel wires do not come into contact with each other, and the sliding noise when the weight body 12 moves backward is reduced. Further, the rearward movement of the weight body 12 is restricted by the coil spring 15 so that no impact sound is generated when moving backward, and sliding contact with other members during rearward movement, for example, sliding with the core tank 5 occurs. There is little touching sound. The retreated weight body 12 is moved forward by being bounced by the coil spring 15 in addition to shaking the shaft cylinder 2, and the front end of the weight body 12 abuts against the protrusion 4 c of the connector 4. The connector 4 moves forward while absorbing the impact force at the time of contact when the elastic piece 4b is bent, and the chuck 3 and the lead tank 5 follow and move forward, and the writing core 10 accommodated in the lead tank 5 is fixed in a certain amount. It is paid out. At this time, since the impact force when the weight body 12 abuts against the connector 4 is absorbed by the elastic piece 4b, the impact sound at that time is reduced.
Therefore, it was possible to obtain a swing-out type mechanical pencil that reduces the impact sound when the weight core 12 is moved back and forth by swinging the shaft cylinder 2 to feed out the writing core.

  Although not shown, when the weight body 12 is fixed to the core tank 5 in this embodiment, the weight body 12 does not move backward when the shaft cylinder 2 is shaken, and the weight body 12 moves forward from the rear. However, since the coil spring 15 always repels the weight body 12 forward, the chuck 4 can be advanced through the connector without increasing the weight body 12. Can do. Thereby, when the weight body 12 is fixed to the core tank 5, it is possible to reduce to a state where there is substantially no sliding contact sound or impact sound generated when the shaft cylinder 2 is shaken.

  The present invention relates to a swing-out mechanical pencil capable of moving the chuck forward and moving the weight body back and forth by swinging the shaft cylinder so that the writing core stored in the lead tank can be fed out. This can be applied when it is desired to reduce the impact sound generated by contacting the member.

1 ... swing-out mechanical pencil,
2 ... Shaft cylinder, 2a ... Locking hole,
3 ... chuck, 3a ... head,
4 ... Connector, 4a ... Base, 4b ... Elastic piece, 4c ... Projection,
5 ... Core tank,
6 ... Fasteners,
7 ... Connector,
8 ... Chuck spring,
9 ... base, 9a ... inner tier,
10 ... Writing core,
11 ... Core holder,
12 ... weight body, 12a ... front receiving part,
13 ... clip,
14 ... crown, 14a ... outer cylinder part, 14b ... inner cylinder part, 14c ... guide hole, 14d ... convex part,
14e ... rear receiving part, 14f ... rear hole step part,
15 ... Coil spring,
16 ... Knock body, 16a ... Eraser insertion part, 16b ... Front hole, 16c ... Bottom part,
16d: locking protrusion, 16e: spring receiving part,
17 ... Knock spring,
18 ... eraser,
19 ... Cap,
20: Contact body.

Claims (2)

Push the abutting body provided in the lead feeding mechanism with the weight body advanced by shaking the shaft cylinder back and forth, and the writing core is opened at the tip of the shaft cylinder by the chuck that moves forward by the advancement of the abutting body. It is a swing-out mechanical pencil that protrudes from the part,
The chuck emits bullet backward by the chuck spring is sandwiched the writing lead in the chuck at the rear of the chuck, and lead tank for accommodating the writing lead, and a connector for connecting the chuck and the lead tank, a provided on the connector An elastic piece having an abutting body with which the weight body abuts is formed , the weight body is arranged in the gap between the core tank and the shaft cylinder, and the front receiving portion provided on the outer surface of the weight body and the inner surface of the shaft cylinder are provided. arranged resilient members including coil springs between the rear receiving portion, the weight body by the elastic member made of a coil spring is resiliently forward at all times,
While forming the elastic force of the elastic member made of a coil spring lower than the elastic force of the chuck spring,
A swing-out mechanical pencil characterized by adjusting a spring constant so that a resilient member made of a coil spring does not fully compress when a weight body moves back along the core tank by swinging a shaft cylinder back and forth .
The swing-out mechanical pencil according to claim 1, wherein a weight body is fixed to the lead tank.

Images