JPS5852955Y2 - Knotsuku style pencil - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a coupling device for attaching the coupling device from the outside of the barrel of a knock-type mechanical pencil and fixing a mechanical part to the barrel.

Some conventional knock-type mechanical pencils have a structure in which the fastener is inserted into the chuck, and then inserted through the opening at the rear end of the barrel, the chuck and fastener are exposed through the opening at the tip of the barrel, and the coupling tool is assembled. In this case, the connector is a small C-shaped ring or a semi-cylindrical component divided into two parts, making it extremely difficult and inefficient to assemble in a small space.

The purpose of this invention is to eliminate the above-mentioned drawbacks and to further facilitate assembly by attaching the connector from the outside of the shaft cylinder.

To explain this invention based on the drawings, as shown in Fig. 1, the shaft cylinder 1 has a large diameter part that engages with the rear end of the mouthpiece 2, a threaded part 1A on the outside following the large diameter part, and a fastener on the inside. A chuck spring 5 is inserted between the inner thigh 1D and the front end 6A of the core tank 6 to constantly spring the chuck 4 backward. has been done.

The inner diameter of this inner thigh 1D is larger than the outer diameter of the fastener 3 and smaller than the inner diameter of the chuck spring 5.

A cap 2 is screwed into the threaded portion IA, and a locking stepped portion 2A is provided in front of the threaded portion of the cap 2 to prevent the fastener 3 from moving forward after the fastener 3 moves a little during knocking. It is provided.

In addition, a through hole 1E into which a locking piece 7A of a coupling member 7 can be inserted is open at an arbitrary appropriate position in the small diameter stepped portion 1C of the shaft cylinder 1, and the locking piece 7A fitted into this through hole 1E is opened. The fastener 3 is prevented from retracting by the locking piece 7A that protrudes inside the portion 1B.

On the other hand, there is a large-diameter fixing hole 2B at the mouth of the threaded part of the cap 2, and when the cap 2 is screwed onto the shaft cylinder 1, the holding arm 7i3 is held in the fixing hole 2B so that it is fixed to the inner diameter. ing.

The knock-type mechanical pencil constructed in this way can be assembled into a chuck by assembling the fastener 3 to the chuck 4, inserting the chuck spring 5 from the head side of the chuck 4, and inserting this from the rear end of the barrel 1. 4 and the fastener 3 are seen through the opening 1B, and are assembled by inserting and fixing the locking piece 7A of the connecting tool 7 into the through hole JLIE formed in the small diameter stepped portion 1C.

Next, to explain another embodiment, FIG. 3 shows one in which the holding arm 17B of the connector 17 is configured to be more than a semicircle, so that it can hold the small diameter stepped portion 1C of the shaft cylinder 1 in more than a semicircle after installation. It is securely attached and cannot be removed.

FIG. 4 shows a convex portion 2 that is press-fitted into a through hole 1E formed in a small diameter stepped portion 1C of a shaft tube 1 on a locking piece 27A of a coupling member 27.
7C, so it can be reliably attached without coming off even when the cap is removed.

Further, FIG. 5 shows that the fixing hole 2B of the base 2 is fixed by providing a saw-toothed convex portion 37D on the upper surface of the holding arm 37B of the connecting tool 37.
It also serves to prevent the cap 2 from loosening by friction-fitting it to the inner surface of the cap.

As mentioned above, compared to conventional connectors, the connector of this invention eliminates the hassle of small parts during assembly, is easy to assemble, and at the same time provides a connector of stable quality. This has a great effect in that it can also prevent the cap from loosening.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of this invention, FIG. 2 is a perspective view of a connector of this invention, and FIGS. 3 to 5 are perspective views of other embodiments of this invention. 1...Shaft tube, 1A...Threaded portion of shaft tube 1, 1B...Opening of shaft tube 1, IC...
Small-diameter stepped portion of shaft cylinder 1, 1D... Internal installation of shaft cylinder 1, 1
E... Through hole of shaft tube 1, 2... Cap,
2A...Locking stepped portion of base 2, 2B...
Fixing hole of base 2, 3... Fastener, 4...
Chuck, 5...Chuck spring, 6...
... Core tank, 6A... Front end of core tank 6, 7, 17, 27, 37... Connector, 7A, 2
7A...Locking piece of connector 7, 27, 7B, 1
7 B, 37 B...Holding arm of connector 17, 37, 27C...Protrusion of connector 27, 37D.
. . . Sawtooth convex portion of the connector 37.

Claims (1)

[Scope of Claim for Utility Model Registration] A knock in which a cylindrical fastener is loosely fitted into a shaft cylinder into which a 10-piece cap is screwed, and a chuck with the fastener fitted onto the head is forced backward to clamp the core. In the type mechanical pencil, a through hole is formed at an arbitrary location in the small-diameter stepped portion at the front end of the barrel, and the connector includes a holding arm and a locking piece integrated with the holding arm,
Insert and fix the locking piece of the coupling tool into the through hole of the small diameter stepped part of the shaft cylinder so that it protrudes inward from the opening, the locking piece locks the fastener from retreating, and then A knock-type mechanical pencil characterized by a holding arm of the connector that is wrapped around the holding arm. 2. A knock-type mechanical pencil according to claim 1, wherein the holding arm of the connector is semicircular or more than semicircular. 36. A knock-type mechanical pencil according to claim 1, wherein a press-fit convex portion is formed on the side of the locking piece of the 36 connector. 4. Utility model registration claim 2, in which a serrated convex portion on the upper surface of the holding arm of the connector is configured to connect with the fitting portion of the cap.
Knock type mechanical pencil described in section.