JPH0546953Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a knock-type mechanical pencil.

[Prior art and its problems]

A bottomed cylindrical button is usually fitted to the rear end of the lead case of a lock-type mechanical pencil, and the button is removed when replenishing the lead case with pencil lead. However, for example, if the button is difficult to remove due to design or structural reasons, a lead insertion hole is provided on the bottom of the button through which only one pencil lead can pass. Replenishment is carried out one by one. At this time, in order to prevent the supplied lead from accidentally coming out from inside the lead case, for example, as shown in FIG. 13 to bottom 11
It protrudes inward from the When the knock button is on the lower side and the fallen pencil lead 15 hits the end face of the lead insertion tube 13, if the pencil lead 15 and the inner hole 12 are even slightly eccentric, the bag around the lead insertion tube 13 will be removed. Since it sinks into the portion 14, it does not come out through the inner hole 12.

However, due to space constraints, the core case 16
If the diameter of the bag becomes very small, the bag portion 14 becomes extremely small. For this reason, the pencil lead 15 is difficult to fall into the bag portion 14, and the probability that the pencil lead 15 that hits the end face of the lead insertion tube 13 and the inner hole 12 coincide is increased, resulting in a problem that it often comes out.

[Purpose of invention]

Therefore, the present invention has been developed in which a lead insertion hole is provided in the lid plug fitted into the rear end opening of the barrel, so that even if the diameter of the lead case is small, the pencil lead that is refilled from the lead insertion hole can be accidentally refilled. The purpose of this invention is to provide a lock-type mechanical pencil that does not come out.

[Structure of the idea and its effects]

The structure of the present invention is such that the proximal end of the clip is connected to a cylindrical knob joint fixed to the rear end of the lead case, and by pressing the clip, the lead case moves forward and the chuck holds the pencil lead. It is a lock-type sharp pencil that opens, and has a lid plug fitted into the rear end opening of the barrel, which has an inner hole through which only one pencil lead can pass, and a lead insertion tube cut out from the tip. is provided to protrude inwardly, and when the pencil is not knapped, the lead insertion tube enters into the knock joint and the inner hole is narrowed, making it impossible for the pencil lead to pass through.

In other words, since a lead insertion tube having an inner hole through which only one pencil lead can pass is protruded inward from the lid plug fitted into the rear end opening of the barrel, when replenishing the pencil lead. This is done from the inner hole of this lead insertion tube in the knotted state, but when it is not in the knotted state, this lead insertion tube goes into the knot joint, and since the lead insertion tube is cut from the tip, the inner hole is opened. It is squeezed, and the pencil lead cannot pass through it, so it cannot come out unexpectedly.

〔Example〕

The present invention will be specifically described below based on embodiments shown in the drawings.

In FIG. 1, a chuck 22 for gripping a pencil lead 15 is connected to the tip of a lead case 16 housed in a barrel 1. A connecting cylinder 24 serving as a receiver for a chuck ring 26 has a fixed tip 25, and the tip 25 is screwed onto an internal thread of the shaft tube 1. A spring 28 is interposed between the connecting tube 24 and the lead case 16, and the chuck 22 is pushed backward by the spring 28, and the chuck ring 26 tightens the chuck 22 and grips the pencil lead 15. do. A cylindrical knot joint 27 is fixed to the rear end of the core case 16. The clip 30 has a side shape of 1 as shown in FIG.
It is formed by bending a real wire rod, and a pair of base end portions 31 enter through a vertical hole 1a formed in the shaft tube 1 and are fixed to a knock joint 27. Therefore, when this clip 30 is pressed and a knock operation is performed, the chuck 22 moves forward and the chuck ring 2
6 is disengaged, the pencil lead 15 is released,
The tip of a pencil lead 15, which is a cursive handwriting, is fed out from the tip 25. When the knob operation is released, the chuck 22 is retracted and the chuck ring 26 is engaged, allowing writing.

A lid plug 10 is fitted into the rear end opening of the shaft cylinder 1. In the center of this cap 10 is a pencil lead 15.
A core insertion tube 13 having an inner hole 12 through which only a core can pass.
is protruding from the inside. This core insertion tube 13 is cut out from the tip so that the inner hole 12 can be easily deformed. In the non-knocking state, the knot joint 27 is retracted by the elastic force of the spring 28, so that the core insertion tube 13 is inserted into the knock joint 27, as shown in FIG.

In this way, in the non-knocking state, the knock joint 27
The lead insertion tube 13 enters inside and the inner hole 12 is constricted and deformed, making it impossible for the pencil lead 15 to pass through and preventing the pencil lead 15 inside the lead case 16 from coming out unexpectedly. When replenishing the pencil lead 15, the clip 30 is pressed to move the knob joint 27 forward. As a result, as shown in FIG. 2, the lead insertion tube 13 comes out of the knob joint 27 and returns to its natural state, allowing the pencil lead 15 to pass through and be replenished.

[Effect of idea]

As explained above, in the knock-type sharp pencil of the present invention, a lead insertion tube having an inner hole through which only one pencil lead can pass is inserted into the lid plug fitted into the rear end opening of the barrel. The lead insertion tube is provided in a protruding manner so that when it is not knapped, the lead insertion tube enters into the knot joint, constricting the inner hole and making it impossible for pencil lead to pass through.This prevents pencil lead from being accidentally refilled from the lead insertion hole. It can be made into a nozzle-type mechanical pencil that never goes out.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the embodiment of the present invention, FIG. 2 is an explanatory view of a locked state, FIG. 3 is a side view, and FIG. 4 is an explanatory view of a conventional example. 1...Shaft cylinder, 10...Lid plug, 12...Inner hole, 1
3...Lead insertion tube, 15...Pencil lead, 16...Lead case, 22...Chuck, 27...Knot joint,
30... Clip.

Claims (1)

[Claims for Utility Model Registration] The proximal end of the clip is connected to a cylindrical knob joint fixed to the rear end of the lead case, and by pressing the clip, the lead case moves forward and the chuck is pushed into the pencil. It is a lock-type sharp pencil that opens the lead, and the lid plug fitted into the rear end opening of the barrel has an inner hole through which only one pencil lead can pass, and the lead is cut out from the tip. A lock-type sharp pencil characterized in that an insertion tube is provided to protrude inward, and when the lead insertion tube is not pressed, the lead insertion tube enters the lock joint and the inner hole is narrowed, making it impossible for the pencil lead to pass through.