JP2517760Y2 - Snap ring mounting tool - Google Patents

Description

[Detailed Description of the Invention] [Outline] A retaining ring mounting tool for mounting a retaining ring on a shaft, with a U-shaped or E-shaped groove formed in the circumferential direction of the shaft for the purpose of sure and easy mounting work. A tool for mounting a retaining ring of a mold, wherein the chuck portion clamps the retaining ring, and the stopper that protrudes forward from the chuck portion and is clamped by the chuck portion when contacting the head of the shaft. A retaining ring mounting tool comprising a height setting portion for keeping a ring at the height of the groove of the shaft, wherein a slide plate protruding downward from the tip of the height setting portion and through which the shaft penetrates. Or a guide groove for accommodating the head of the shaft in the height setting part, and the shaft projecting downward from the tip of the height setting part. It is configured so that a rotation blocking portion that slides in the elongated hole of the penetrating slide plate is provided .

[Industrial applications]

The present invention relates to a snap ring mounting tool for mounting a snap ring on a shaft.

A rotary shaft or slide shaft of a cassette deck or the like has a U-shaped or E-shaped retaining ring attached to the shaft end to prevent the rotary plate or the slide plate from coming off. Since this type of snap ring has a small outer diameter of about several mm, it must be manually attached using a tool.

[Conventional technology]

FIG. 4 shows an example of a conventional snap ring mounting tool, in which 11 is a chuck portion and 12 is a grip portion to be gripped by hand. The chuck portion 11 has a slit 13 at the center and elastically clamps the retaining ring 20.

FIG. 5 shows, as an example of a shaft on which the retaining ring 20 is mounted, a shaft 30 which is planted in the chassis 41 and penetrates the elongated hole 43 of the slide plate 42. The slide plate 42 of this example is restricted by the two shafts 30A and 30B and slides only in the direction of the elongated hole 43.

[Problems to be solved by the device]

A circumferential groove 31 is formed at the end of the shaft 30 as shown in FIG. 6, and the retaining ring 20 is mounted therein. That is, when the retaining ring 20 is pressed against the groove 31 while being held by the chuck portion 11, the opening of the retaining ring 20 opens and fits around the groove 31, and when the chuck portion 11 is pulled in that state, only the retaining ring 20 is pulled. Is left and installed on the shaft 31 side.

However, when the chuck portion 11 is pressed while being tilted in a vertical plane as shown in FIG. 6 (a), the retaining ring 20 is also tilted and the tilting failure occurs. If the chuck portion 11 is displaced in the height direction as shown in (b) or laterally as shown in (c), the retaining ring 20 cannot be mounted on the shaft 30. Further, as in (d), the chuck part
When 11 rotates in the horizontal plane, the retaining ring 20 is also mounted in that direction. Therefore, when it is ideal to mount the retaining ring 20 like the retaining ring 20 of the shaft 30A in FIG. Ring 20
As described above, there is a drawback in that the detachment prevention function of the slide plate 42 is deteriorated when it is mounted by rotating 90 °.

It is an object of the present invention to remedy such drawbacks and to make the work of attaching a retaining ring reliable and easy.

[Means for solving the problem]

The retaining ring mounting tool of the present invention has the structure shown in FIGS. In FIG. 1, 10 is a snap ring mounting tool, 11 is its chuck portion, and 14 is a height setting portion projecting forward from the chuck portion 11. The height setting portion 14 horizontally projects from the upper surface of the retaining ring 20 held by the chuck portion 11 to a position slightly higher than the thickness t of the head 32 of the shaft 30.

In FIG. 2, reference numeral 15 is a guide groove, which is formed at the center of the lower surface of the height setting portion 14 of the snap ring mounting tool. Further, in FIG. 3, reference numeral 17 denotes a rotation blocking portion, which projects downward from the tip of the height setting portion 14.

[Action]

As shown in FIG. 1, the retaining ring mounting tool 10 of the present invention is used so that the height setting portion 14 is brought into contact with the head portion 32 of the shaft 30. In this state, the chuck portion 11 is slid horizontally.
The retaining ring 20 sandwiched between is fitted into the groove 31 of the shaft 30.

When the height setting portion 14 is brought into contact with the head 32, the retaining ring 20 is held at a height at which it can fit in the groove 31, so that the retaining ring 20 cannot be mounted due to a height failure as shown in FIG. 6 (b). I don't care. Further, although the defects shown in (a), (c), and (d) of FIG. 3 can be almost prevented by sliding the height setting portion 14 horizontally, the guide groove 15 of FIG. 2 and the rotation blocking portion 17 of FIG. By forming it, the effect can be made more remarkable.

〔Example〕

FIG. 2 is a block diagram of the first embodiment of the present invention, (a) is a front view and (b) is a plan view. Retaining ring installation tool 10 of this example
A guide groove 15 into which the head 32 of the shaft 30 is inserted is formed in the center of the lower surface of the height setting portion 14 so as to prevent the lateral deviation defect in FIG. 6 (c). The opening 16 of the guide groove 15 may be inclined so that the head 32 can be easily inserted even if there is some positional deviation. According to this example, FIG. 6 (b) (c)
It is possible to reliably prevent the defects.

FIG. 3 is a block diagram of a second embodiment of the present invention. In this example, a rotation blocking portion 17 protruding downward from the tip of the height setting portion 14 is provided, and the tip thereof is inserted into the elongated hole 43 of the slide plate 42 so that the horizontal plane as shown in FIG. It is designed to prevent rotation. That is, the tool 10 of this example makes the height setting part 14 contact the head part 32 of the shaft 30 while the rotation prevention part
Since the whole slides with the tip of 17 inserted in the long hole 43, the sliding direction is only the direction of the long hole 43,
The retaining ring 20 is mounted in an ideal rotational position similar to that for the shaft 30A in FIG. 5 (b). Incidentally, if the tip of the rotation blocking portion 17 is brought into contact with the chassis 41, the inclination shown in FIG. 6 (a) can be prevented, and if it is used together with the guide groove 15 shown in FIG. The attachment is most reliable.

[Effect of device]

As described above, according to the present invention, there is an advantage that the work of mounting the minute retaining ring on the shaft can be easily and surely performed.

[Brief description of drawings]

1 is a principle diagram of the present invention, FIG. 2 is a configuration diagram of a first embodiment of the present invention, FIG. 3 is a configuration diagram of a second embodiment of the present invention, and FIG. 4 is a conventional snap ring mounting tool. FIG. 5 is a configuration diagram of the slide plate support mechanism, and FIG. 6 is an explanatory diagram of problems of the conventional tool. In the figure, 10 is a snap ring mounting tool, 11 is a chuck part, 14 is a height setting part, 15 is a guide groove, 16 is a rotation blocking part, 20 is a snap ring,
Reference numeral 30 is a shaft, 31 is a groove, and 32 is a head.

Claims (2)

(57) [Scope of utility model registration request] 1. A tool for mounting a U-shaped or E-shaped retaining ring (20) in a groove (31) formed in the circumferential direction of a shaft (30), the chuck portion (11) holding the retaining ring. ) And a height setting part (6) that protrudes forward from the chuck part and holds the retaining ring held by the chuck part at the height of the groove of the shaft when it comes into contact with the head part (32) of the shaft. 14) is provided with a snap ring mounting tool, which slides in an elongated hole of a slide plate which projects downward from the tip of the height setting portion (14) and through which the shaft (30) penetrates. A snap ring mounting tool characterized in that a rotation blocking portion (17) is provided. 2. A tool for mounting a U-shaped or E-shaped retaining ring (20) in a groove (31) formed in the circumferential direction of a shaft (30), the chuck portion (11) holding the retaining ring. ) And a height setting part (6) that protrudes forward from the chuck part and holds the retaining ring held by the chuck part at the height of the groove of the shaft when it comes into contact with the head part (32) of the shaft. A retaining ring mounting tool comprising: a guide groove (15) for accommodating a shaft head (32) in the height setting part (14); and the height setting part (14). A retaining ring mounting tool, characterized in that it is provided with a rotation blocking portion (17) which projects downward from the tip of (14) and slides in an elongated hole of a slide plate through which the shaft (30) penetrates.