JP2008030183A - Snap ring mounting tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mounting tool having excellent practicability and workability capable of smoothly and speedily performing snap ring mounting work. <P>SOLUTION: An X-shaped mounting tool 10 is formed by pivotally mounting a pair of levers 11, 12 each other at a position slightly near a tip from a central part to freely rotate. An end 17 of the first lever 11 is magnetized and a cut groove 21 for holding a snap ring orthogonal to the end 17 is formed in an abutting inner face. A cut groove 22 is formed in the abutting inner face of an end 18 of the second lever 12 in a direction orthogonal to the cut groove 21 to hold down a shaft. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a snap ring installation tool.

JP 2004-130397 A Design registration No. 1086504 gazette

  The snap ring is a C-shaped or E-shaped retaining ring that is fitted with a groove around the shaft so that the shaft inserted into the bracket or the like and the bearing fitted to the shaft do not come off in the axial direction. Moreover, it is made of spring steel and fits into the groove using elasticity. As a tool for attaching and detaching the snap ring, for example, pliers as shown in Patent Document 1 and Patent Document 2 are used. In this device, the two claws at the tip are passed through the hole at the end of the snap ring, and the snap ring is expanded and contracted and attached to the shaft or hole. However, such a plier is difficult to use for attaching a small snap ring to a thin shaft or the like.

  On the other hand, as an attachment tool for handling a small snap ring, an attachment tool 100 for fixing the snap ring and pressing it against a shaft as shown in FIG. 6 is known. In this attachment tool 100, a leaf spring-like claw 102 is fixed to an end portion of a metal stay 101 with a pin 103 so that the tips thereof are aligned, and a snap ring is inserted into a gap between the tip portion of the stay 101 and the tip portion of the claw 102. 104 is fitted and held. In the attachment tool 100, the snap ring 104 is attached to the shaft or the like by pressing the held snap ring 104 against the shaft. Thereby, a small snap ring can be mounted.

  However, in the conventional example of FIG. 6, since the positional relationship between the snap ring 104 and the shaft is not fixed, it is not stable and difficult to handle. Therefore, there is a limit to performing the attaching operation of the snap ring 104 accurately and smoothly. In particular, the snap ring installation work is often performed as a flow work, and in the case of manufacturers of machine parts and the like where improvement in the mass productivity of products is important, it is difficult to perform the smooth work as described above. It takes time to install the ring, which is a problem. Further, when the snap ring 104 is fitted into the gap, the gap may be wide with respect to the thickness of the snap ring 104, and it may be difficult to hold the snap ring 104 with the attachment tool 100.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a snap ring mounting tool excellent in practicality and workability that can smoothly and speedily perform a small snap ring mounting operation.

  The snap ring mounting tool of the present invention is a bowl-shaped tool in which the inner surfaces of a pair of tip portions are in contact with each other, and the snap ring is held on the inner surface of the first tip portion among the inner surfaces of the pair of tip portions. A notch groove is formed, and the inner surface of the second tip is a surface that presses the shaft (claim 1).

  Furthermore, it is preferable that a cut groove for holding the shaft is formed on the inner surface of the second tip portion so as to be orthogonal to the cut groove for holding the snap ring (Claim 2).

  Furthermore, it is preferable that at least the first tip portion of the pair of tip portions is magnetized.

  Furthermore, it is preferable that the cut groove for holding the snap ring is orthogonal to the longitudinal direction of the first tip.

  Further, it is preferable that the second tip end portion is inclined so as to become gradually thinner toward the tip end (Claim 5).

  The snap ring mounting tool of the present invention (Claim 1) can be held in a stable state by holding the opposite side of the gap between both ends of the snap ring by a cut groove and sandwiching the shaft and the snap ring from both sides. And by pinching in this state, a shaft can be forced to pass through the gap of the snap ring. For this reason, the snap ring can be attached smoothly and speedily. In addition, this effect can be achieved regardless of the direction of the cut groove for holding the snap ring.

  In addition, in the case where a notch groove for holding the shaft is formed on the inner surface of the second tip portion so as to be orthogonal to the notch groove for holding the snap ring, the shaft is laterally moved by applying the shaft to the notch groove. It can be held so as not to slip.

  Further, when at least the first tip portion of the pair of tip portions is magnetized, the snap ring formed of the spring steel does not fall off, so that it is easier to handle (Claim 3). Further, when the second tip portion is also magnetized, the steel shaft can be held, so that it is easier to handle.

  Further, when both tip portions are magnetized, the tip portions are repelled and separated when they have the same polarity, so that it is easy to remove the attachment tool when the snap ring is completely attached. On the other hand, when the polarities are different from each other, the shaft and the snap ring are attracted to each other, which makes it easy to fit.

  In addition, when the cut groove for holding the snap ring is orthogonal to the longitudinal direction of the tip, the snap ring can be held so as to be orthogonal to the shaft or the like. (Claim 4).

  In addition, when the second tip is gradually thinner toward the tip, the tip of the attachment tool is used as the shaft even if the bracket attached to the shaft is near the snap ring attachment position. Easy to approach. Further, it can be used when the snap ring is removed (Claim 5).

  Next, an embodiment of a snap ring mounting tool (hereinafter simply referred to as “mounting tool”) of the present invention will be described with reference to the drawings. 1 is a perspective view showing an embodiment of the mounting tool of the present invention, FIG. 2a is a perspective view of a first tip of the mounting tool, FIG. 2b is a perspective view of a second tip of the mounting tool, FIG. FIG. 4 is a side view showing the second tip, and FIG. 5 is a perspective view showing another embodiment of the attachment tool of the present invention.

  The mounting tool 10 shown in FIG. 1 is formed in an X-shape by pivotally mounting a pair of levers, that is, a first lever 11 and a second lever 12 so as to be rotatable slightly closer to the tip than the center. Specifically, a bearing hole is formed in a portion slightly closer to the tip than the center portion of the second lever 12, and a shaft portion 19 is provided in a portion closer to the tip than the center portion of the other first lever 11. The first lever 11 and the second lever 12 are pivotally attached to each other by pivotally attaching the shaft portion 19 formed on the first lever 11 to the bearing hole of the second lever 12. The portions on the front end side from the shaft portions of the first lever 11 and the second lever 12 are working portions 13 and 14, and the rear end portions are grip portions 15 and 16. Thereby, by gripping the grips 15 and 16, the tip of the first lever 11 (hereinafter referred to as the first tip) 17 and the tip of the second lever (hereinafter referred to as the second tip). ) 18 and the object can be picked.

  As shown in FIG. 2 a, the first tip portion 17 is formed on the abutting inner surface so that a first cut groove 21 having a substantially U-shaped or V-shaped cross section is orthogonal to the first tip portion 17. Has been. The cut groove 21 is not particularly limited in cross-sectional shape, direction, depth, width, and length, and any shape may be used as long as the snap ring 30 can be held. However, since the periphery of the snap ring is generally curved, the first cut groove 21 is preferably a U groove. Further, the direction is orthogonal to the first tip 17 so that the force is evenly applied when the shaft (see reference numeral 32 in FIG. 3) is pressed against the gap of the snap ring (see reference numeral 31 in FIG. 2). The direction is preferred.

  In this embodiment, the first tip portion 17 is magnetized. Thereby, the snap ring can be stably held. However, the magnetized part is not particularly limited, and the entire first working unit 13 may be magnetized.

  As shown in FIG. 2 b, the second tip end portion 18 is formed with a U-groove second cut groove 22 along the second tip portion 18 on the abutting inner surface. Thereby, since the direction of the 1st notch groove and the 2nd notch groove 22 is orthogonal, it is easy to position an axis | shaft at right angle with respect to a snap ring. The cross-sectional shape, depth, width, and length of the second cut groove 22 are not particularly limited. However, in general, a U-shaped groove or a V-shaped groove is desirable in order to keep a shaft having a circular cross-sectional shape from slipping.

  Similarly to the first tip portion 17, the second tip portion 18 and the working portion 14 of the second lever 12 may be magnetized. In that case, the shaft to be fitted can be stably held. Further, the magnetic pole is not limited. Further, as shown in FIG. 4, the second tip end portion 18 becomes thinner as the outer surface gradually approaches the tip end. Thereby, the front-end | tip part 18 can be utilized in order to insert in the clearance gap of a snap ring, and to remove from a shaft.

  The gripping portions 15 and 16 are provided with rubber coatings 23 and 24, respectively. The rubber coatings 23 and 24 are optional, but can provide anti-slip and electrical insulation effects.

  Next, the usage method of the mounting tool 10 comprised as mentioned above is demonstrated. As shown in FIG. 3, first, the opposite side of the gap (disconnected portion) 31 of the snap ring 30 is fitted into the first cut groove 21 and held. Then, the mounting tool 10 is brought close to the second cut groove 22 so as to hold the shaft 32. Further, the gripping portions 17 and 18 are gripped, and the shaft 32 is applied to the gap 31 of the snap ring 30. The shaft 32 is formed with an annular groove 33 into which the snap ring 30 is fitted. In this state, when the snap ring 30 and the shaft 32 are sandwiched between the first tip portion 17 and the second tip portion 18, the shaft 32 is pushed into the snap ring 30 through the gap 31.

  At that time, the gap 31 of the snap ring 30 expands so as to receive the shaft 32, and after the shaft 32 enters the snap ring 30, it is elastically closed. Thereby, the snap ring 30 is mounted in the annular groove 33 around the shaft 32.

  In the above embodiment, the first lever 11 and the second lever 12 are pivotally attached. However, the rear ends of the first lever 11 and the second lever 12 such as the mounting tool 40 shown in FIG. It can also be set as the tool of a tweezers or a Japanese-style shape which makes the front-end | tip parts 17 and 18 contact | abut with the elasticity of 11 and 12.

It is a perspective view which shows embodiment of the attachment tool of this invention. 2a and 2b are perspective views of the first tip and the second tip of the attachment tool, respectively. It is a side view which shows the usage method of the attachment tool. It is a side view which shows the 2nd front-end | tip part of the attachment tool. It is a perspective view which shows other embodiment of the attachment tool of this invention. It is a perspective view which shows an example of the attachment tool of the conventional snap ring.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Installation tool 11 1st lever 12 2nd lever 13, 14 Working part 15, 16 Gripping part 17 1st front-end | tip part 18 2nd front-end | tip part 19 Shaft part 21 1st cut groove 22 2nd cut groove 23 , 24 Rubber coating 30 Snap ring 31 Clearance 32 Shaft 33 Annular groove 40 Mounting tool 100 Conventional mounting tool 101 Metal stay 102 Leaf spring-like claw 103 Pin 104 Snap ring

Claims (5)

A hook-shaped tool in which the inner surfaces of a pair of tip portions are in contact with each other,
A notch groove for holding a snap ring is formed on the inner surface of the first tip portion of the inner surfaces of the pair of tip portions,
A snap ring mounting tool in which the inner surface of the second tip is a surface that presses the shaft.   2. The snap ring attachment tool according to claim 1, wherein a cut groove for pressing a shaft is formed on an inner surface of the second tip portion so as to be orthogonal to the cut groove for holding the snap ring.   The snap ring attachment tool according to claim 1 or 2, wherein at least a first tip portion of the pair of tip portions is magnetized.   The snap ring attachment tool according to claim 1, 2, or 3, wherein the cut groove for holding the snap ring is orthogonal to the longitudinal direction of the first tip portion. The snap ring attachment tool according to claim 1, 2, 3, or 4, wherein the second tip portion is gradually thinner toward the tip.