JPH0312557Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a ballpoint pen in which the core of the ballpoint pen can be taken in and out by the impact of a weight body slidably fitted inside the ballpoint pen.

Prior Art Conventionally, as shown in FIG. 7, in a ballpoint pen whose lead is put in and taken out by a weight body, the tail end of the lead 3 pushed out from the ejection opening 2 by the weight body 1 is held in an upper locking part during use. 4, and when not in use, the ballpoint pen is turned upside down and the lead is dropped into an upper hollow part 5 for storage.
However, in the case of this conventionally known structure, when the ballpoint pen is placed horizontally, the lead is at the protruding opening 2.
The ballpoint pen has drawbacks such as being unable to write because it does not protrude from the tip, and the lead inadvertently protruding from the ejection opening 2 when the ballpoint pen is turned downward.

Problems that the invention attempts to solve This invention attempts to solve the problems mentioned above, and uses a weight body as a component so that even when the ballpoint pen is placed horizontally, the lead does not protrude from the ejection opening. To provide a ballpoint pen which eliminates drawbacks such as not being able to write on the pen or the lead inadvertently protruding from a protruding opening when the ballpoint pen is turned downward.

Means for solving the problems In order to solve the problems mentioned above, the present invention
A chuck with multiple slits radially from the center is fixedly formed on the tail part of the ballpoint pen body with a lead opening at the tip, and a fastening spring is applied to the outer circumference of the chuck to urge the chuck in the fastening direction. A chuck tightening ring is movably fitted into the ballpoint pen body, and a lead tube is housed in the ballpoint pen body, and the lead protruding from the tip of the lead tube is positioned so as to be able to protrude so as to face the ejection opening. A weight retaining ring is fixedly protruded from the outer periphery of the core cylinder on the protruding side, and a tail shaft provided on the chuck side is
A first locking portion is formed by providing a stepped portion, and a second locking portion is formed by providing a step portion with a small diameter at the tip of the first locking portion, and the first locking portion and the second locking portion are formed. is inserted into the chuck and tightened, and a weight body having a certain weight is slidably attached between the weight body retaining ring and the chuck tightening ring to prevent the impact of the weight body from colliding with the weight body retaining ring. As a result, the first locking part of the tail shaft of the core tube is released from the chuck, the core is made to protrude from the protrusion opening, and the chuck is activated by the impact of the weight body hitting the chuck tightening ring. The pen is released against the restoring force, the first locking part and the second locking part of the tail shaft are inserted into the chuck, and the lead is housed in the ballpoint pen body from the protruding opening.

Function Since the present invention is constructed as described above, in order to protrude the lead from the ballpoint pen body and perform writing work, the protrusion opening is positioned downward and the weight body is moved by shaking it strongly or by moving it up and down strongly. The weight body collides with the retaining ring, and the impact of this collision causes the first locking portion of the tail shaft of the core tube to disengage from the chuck, allowing the core to protrude from the ejection opening. In this state, the second locking portion is located within the chuck, so that the core tube does not move and the writing operation is not hindered. In addition, to store the lead inside the ballpoint pen body, place the protruding opening of the lead upward and shake it strongly or move it up and down strongly so that the weight collides with the chuck tightening ring, and the impact of this collision causes the weight to collide with the chuck ring. Then, move the chuck tightening ring in the direction of chuck release against the restoring force of the tightening spring, insert the first locking part and the second locking part of the tail shaft into the chuck, and insert the core from the protrusion opening. It can be stored in the ballpoint pen body. In this state, the first and second locking parts are fastened to the chuck, so even if the ballpoint pen is turned downward, there will be no accident such as the lead accidentally protruding from the ejection opening. be.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 10 denotes a ballpoint pen body, which has a protrusion 12 for a lead 11 at its tip and a closing lid 13 at its tail.
A chuck 15 having a plurality of slits 14 radially extending from the center is fixedly formed on the inner surface of this closing lid 13, and on the outer periphery of this chuck 15,
A chuck tightening ring 17, which is biased in the direction of tightening the chuck 15 by a tightening spring 16, is movably fitted and formed.

Furthermore, the cuts 14 of the chuck 15 can be formed in any number of two or more, as shown in FIGS. 4 and 5. In addition, the ballpoint pen body 10
A core tube 18 is housed therein, and the core 11 protruding from the tip of the core tube 18 is positioned so as to be able to protrude, facing the ejection opening 12. A weight body retaining ring 20 is fixedly protruded from the outer periphery of the core tube 18 on the protruding side of the lead 11, and a spring 19 is provided between the weight body retaining ring 20 and the protrusion opening 12 side of the ballpoint pen body 10. The core tube 18 is biased toward the chuck 15 by intervening therebetween.

Further, the tail shaft 21 provided on the chuck side of the core tube 18 is provided with a stepped portion to form a first locking portion 22, and a stepped portion with a smaller diameter is provided at the tip of the first locking portion 22 to form a second locking portion. A locking portion 23 is formed, and this first locking portion 22 and a second locking portion 23 are formed.
The locking part 23 is inserted and tightened into the chuck 15, and a cylindrical weight body 24 having a certain weight can be slid on the outer periphery of the core cylinder 18 between the weight body retaining ring 20 and the chuck tightening ring 17. It is attached to.

In the structure as described above, the core 11
To protrude from the ballpoint pen body 1 and perform writing work, position the protrusion 12 downward and shake it strongly or move it up and down strongly to release the weight retaining ring 20.
The impact of this collision causes the first locking portion 22 of the tail shaft 21 of the core tube 18 to disengage from the chuck 15, and the core 1
1 can be made to protrude from the protrusion opening 12. In this state, the second locking portion 23 is located within the chuck 15 and is fastened, so that the core tube 18 does not move or interfere with writing work.

In addition, in order to store the lead 11 in the ballpoint pen body 10, the protruding opening 12 of the lead 11 is positioned upward,
By shaking strongly or moving up and down strongly, the weight body 2
4 collides with the chuck tightening ring 17, and the impact of this collision causes the chuck tightening ring 17 to be tightened by the tightening spring 16.
The chuck 15 moves in the direction of release against the restoring force of the chuck 15. This movement causes the first locking portion 22 of the tail shaft 21 to
The second locking part 23 is inserted into the chuck 15, and the lead 11 is inserted into the ballpoint pen body 10 through the protrusion opening 12.
It can be stored inside. In this state, since the first and second locking parts 22 and 23 are fastened to the chuck 15, the protrusion opening of the ballpoint pen body 10
Even if 2 is turned downward, accidents such as the core 11 inadvertently protruding from the ejection opening will not occur.

Effects of the invention Since the invention is constructed as described above, when the ballpoint pen is placed horizontally, the lead does not protrude from the ejection opening and the ballpoint pen becomes unable to write, or when the ballpoint pen is turned downward. Eliminates drawbacks such as the core inadvertently protruding from the protrusion opening when
This enables stable use of a ballpoint pen.

[Brief explanation of drawings]

Drawings showing embodiments of the present invention.
The figure is a cross-sectional view of the lead protruding state, Figure 2 is a cross-sectional view of the lead housed in the ballpoint pen body, Figures 3 and 4 are plan views showing examples of chuck cutting, and Figure 5 is a conventional one. FIG. 2 is a cross-sectional view of a ballpoint pen using a weight body according to the technique. 10...ballpoint pen body, 11...core, 12...
...Protrusion opening, 14...Cut, 15...Chuck, 16...Tightening spring, 17...Chuck tightening ring, 18...Core tube, 20...Spindle retaining ring, 21...
... tail shaft, 22 ... first locking part, 23 ... second locking part, 24 ... weight body.

Claims (1)

[Scope of Claim for Utility Model Registration] A chuck with a plurality of slits radially extending from the center is fixedly formed on the tail part of the ballpoint pen body with a lead opening at the tip, and a fastening spring is attached to the outer periphery of this chuck. A chuck tightening ring that is biased in the chuck tightening direction is movably fitted, and a core tube is housed in the ballpoint pen body, and the core protruding from the tip of the core tube faces the ejection opening. A weight retaining ring is fixedly protruded from the outer periphery of the core tube on the side where the core protrudes, and a tail shaft provided on the chuck side is provided with a weight retaining ring.
A first locking portion is formed by providing a stepped portion, and a second locking portion is formed by providing a step portion with a small diameter at the tip of the first locking portion, and the first locking portion and the second locking portion are formed. is inserted into the chuck and tightened, and a weight body having a certain weight is slidably attached between the weight body retaining ring and the chuck tightening ring to prevent the impact of the weight body from colliding with the weight body retaining ring. As a result, the first locking part of the tail shaft of the core tube is released from the chuck, the core is made to protrude from the protrusion opening, and the chuck is activated by the impact of the weight body hitting the chuck tightening ring. The ballpoint pen is released against the restoring force, the first locking part and the second locking part of the tail shaft are inserted into the chuck, and the lead is stored in the ballpoint pen body through the protruding opening. Ballpoint pen.