JPS6042100A - Method of combining internal mechanism and outer cylinder inknock type pencil, etc. and cap cylinder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for coupling an internal mechanism of a knock-type pencil or the like to an outer barrel in one operation, and a base barrel.

Conventionally, in a knock-type pencil, in order to assemble the lead feeding mechanism, which is an internal mechanism, to the outer cylinder, as shown in Fig. The hexagonal collar cl protruding outward is fitted to the rear end of the chuck holder C of the mechanism, and the cap d is attached to the male thread C2 threaded on the front half of the holder C protruding from the tip of the outer cylinder a.
Insert the internal thread dl threaded into the rear inner surface, bring the rear end surface of the cap d into contact with the end surface of the tip a1, and tighten the tip a1 of the outer cylinder a with the hexagonal collar C. This was done by holding it in place.

However, with such a conventional method of screwing in the cap, it is not only time consuming to protrude the chuck holder of the core feeding mechanism from the tip of the outer cylinder and then turn the cap many times to screw into the holder. In order to prevent the holder from rotating together due to screwing, it is necessary to form a rotation prevention structure such as a hexagonal step or a hexagonal collar on both the holder and the outer cylinder and fit them together.

In addition, since it is a screw-in type, there is a problem in that the cap loosens during use, causing the core to break, and in some cases, the cap may fall off and be lost.

This invention was made by focusing on the problems mentioned above.
The core feeding mechanism protruding from the tip of the outer cylinder is crimped onto the outer cylinder using a retaining ring and an elastic body, which simplifies the assembly structure and its labor and solves these problems. It is intended to.

An embodiment of the present invention will be described below with reference to FIG. 2 and subsequent figures.

1. First, I will explain the configuration.

1, an outer cylinder having a cylindrical insertion opening 1a with a radially inner diameter at the tip, and a streamlined hollow cylinder both inside and outside; 2, a lead feeding mechanism fixed to the tip of the chuck holder 3; The lead guide tube 4 is slidably inserted into the cap tube 5 and is equipped with a chuck and a chuck holder (not shown) at the tip, and a lead gripping spring 8 is fitted, and the cap tube 5 and the chuck holder 3 are fitted together. and are biased in opposite directions. Base tube 5
The rear cylinder 1 is integrally fitted into the front cylinder 6 and has an outer diameter of 05 mm and a dimension (D- to D) close to the inner diameter of the insertion opening 1a. A ring groove 10 for a retaining ring 9 is cut in a cylindrical portion 6b near a conical portion 6a formed at the front end of the front tube 6. As shown in FIG. 3, the longitudinal section of the groove 10 has a depth such that the front portion 108 has a depth such that approximately half of the retaining ring 9 is exposed on the outer peripheral surface of the cylindrical portion 6b.
That is, the slope has a depth approximately equal to the cross-sectional radius of the retaining ring 9, and the rear portion 10b has a depth approximately equal to the cross-sectional diameter of the retaining ring 9, which is the dimension at which the retaining ring 9 disappears from the outer peripheral surface. It is formed on the plane of

Further, the rear tube 7 has a protruding collar 1a at its rear end, and its front portion is fitted into the inner surface of the front tube 6 and fixed through a plurality of caulking holes 6C. The coupling spring 11 of the lead feeding mechanism 2, which has a stronger tension than the lead gripping spring 8, is fitted into the mouthpiece tube 5 with the entire rear end in contact with the flange 7a, and the front end of the spring 11 is fitted into the caulking hole 6CK. This is to prevent the core feeding mechanism 2 from slipping off before it is inserted into the outer cylinder 1.

Note that the retaining ring 9 may be a ring that can be contracted in the circumferential direction, such as a C-shaped ring or a spiral ring, so the cross-sectional shape does not have to be a specific shape such as a circle.

Next, the coupling method will be described based on FIG.

In advance, the core feeding mechanism 2 with the retaining ring 9 fitted into the ring groove 10 of the base tube 5 is inserted from the rear end of the outer tube 1, and the insertion opening 1 is inserted.
When trying to make the conical part 6a of the cap tube 5 protrude from a,
The retaining ring 9 comes into contact with the narrowed inner slope 1b at the front end of the outer cylinder 1, and the tip of the force-coupling spring II also contacts the inner slope 1b behind it, preventing it from moving forward. C
(See Figure 1) As the lead feeding mechanism 2 continues to move forward, the retaining ring 9
moves to the rear part 10b of the ring groove 10 under the control of the inner slope lb, and the lead gripping spring 8 with weak elasticity moves to the chuck holder 3 as the lead guide cylinder 4 enters the mouth cylinder 5. Since it is compressed and reaches the compression limit, the force of the chuck holder 30 is now directly applied to the front mouthpiece 5, and the mouthpiece tube 5 begins to move forward while the coupling spring 11 is compressed by the collar 7a. (See Figure I) Therefore, the stop spring 9 is compressed by the conical inner slope 1b following the inner end of the insertion port 1a, sinks into the ring groove 10, and enters the outer peripheral surface of the cylindrical part 6b (Figure I ]) Passes through the insertion port 1a and exits from the tip of the outer cylinder 1. Immediately, the retaining ring 9 expands due to its own elasticity and returns to its original outer diameter. (See Figure ■) Then, when the advance of the lead feeding mechanism 2 is stopped and it is made free, the coupling spring II also rebounds in an attempt to return to its original state, so the collar 7a is pushed back and the mouthpiece tube 5 is retreated, but the IE
The collar 9 comes into contact with the front end of the outer cylinder C, controls the front wall of the ring groove 10, and prevents the base cylinder 5 from retreating. Subsequently, the lead gripping ring 8 also rebounds and pushes the chuck holder 3 back to a predetermined position, returning it to its original state. (See Figure V)
That is, the lead feeding mechanism 2 is coupled to the outer tube I by the cooperation of the stop ring 9 fitted into the ring groove 10 of the cap tube 5 and the coupling spring 11 that abuts the inner slope 1b of the outer tube I. .

As mentioned above, it would be a long explanation to explain the functions of each member in detail, but this coupling operation involves one action of fully inserting the core feeding mechanism 2 from the rear end of the outer cylinder 1 and releasing it, thereby freeing it. This completes the connection.

In addition, as another embodiment, as shown in FIG.
For the retaining ring holder, a groove IC is carved on the inner periphery of the insertion opening la, or a recess 1 is formed at the tip of the insertion opening la, as shown in Figure H.
If d is carved, the lead feeding mechanism 2 can be connected in the same manner as in the previous embodiment, and the retaining ring 9 is hidden inside the outer cylinder l, which gives a good appearance. - The present invention can be applied to a ballpoint pen in exactly the same way, both in terms of the joining method and its structure.

As explained above, this invention allows the internal mechanism to be inserted from the rear end of the outer cylinder by forming the ring groove of the base cylinder to the required depth and width, and then automatically removes it with a simple push. Since we have provided a method and a cap tube that can be connected to a tube, it is a simple structure that does not require any separate parts, not to mention the screws for coupling inside the cap or the chuck holder.
Since it can be connected in one operation, it has a great effect on reducing man-hours and costs. In particular, when used in combination with the invention of the patent application No. 57-186098 previously filed by the inventor of the present invention in the various companies of Ohira Co., Ltd. (Representative: Chuji Matsunaga), it is possible to automate the assembly, and it is possible to This has the remarkable effect of establishing a production system.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view showing the coupling structure between the internal mechanism and the outer cylinder of a conventional knock-type vent seal, and FIG. 2 is a longitudinal cross-sectional view showing the coupling structure between the internal mechanism and the outer cylinder of the present invention. , Figure 3 is
Similarly, FIG. 44, which is an enlarged half-sectional view of the main part of the base tube, is an explanatory partial cross-sectional view showing the coupling method of the present invention. FIG. Figure in which the lead gripping spring has reached its compression limit and the retaining ring has moved to the rear of the ring groove; Attached diagram shows that the retaining ring has entered the insertion opening of the outer cylinder. Figures and Figure ■ are views where the retaining ring has come out of the outer cylinder tip and expanded and returned to its original outer diameter, Figure V is a view where the connection between the lead feeding mechanism and the outer cylinder is completed, and Figure 5 is A half-sectional view of the main part of the embodiment,
FIG. 1 shows a retaining ring receiver with a groove provided inside the outer cylinder insertion port, and FIG. N shows a recess carved in the front end of the insertion port. 1......Outer tube 1a...Insertion port 1b...Inner slope 2... ... Core feeding mechanism 5 ...
......Base tube 6b...Cylindrical portion 9...Retaining ring IO...
...Ring groove 108...Front part 10b...Rear part 11...Coupling spring Fig. 4 Fig. 5

Claims (2)

[Claims] (1) A coupling spring is inserted between the rear end of the cap tube of the internal mechanism and the inner slope of the outer tube and biased in opposite directions. A retaining ring is fitted in advance into a ring groove formed at a depth that is smaller than the cross-sectional length of the ring and whose rear part is sloped to a greater extent than the cross-sectional length, and the internal mechanism is inserted from the rear end of the outer cylinder. With one action, the retaining ring is passed through the insertion opening of the outer cylinder, which has an inner diameter slightly larger than the outer diameter of the cylindrical part of the base tube, and then the outer cylinder is pressed and clamped between the retaining ring and the coupling spring. A method for connecting the internal mechanism and the outer cylinder of a knock-type pencil, etc. (2)・The front part is smaller than the cross-sectional length of the retaining ring,
A ring groove formed at the rear part with a depth greater than the length of the cross section is fitted with a telescopic and movable retaining ring, and a coupling spring is inserted through the ring groove. Base tube.