JPH10574A - Retaining ring pliers - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the uniformity of fitting and removing work of a retaining ring by improving workability by shortening time to tightly grip retaining ring pliers. SOLUTION: Pliers 1 are constituted to fasten a pair of handles 3 having point end parts 2 to insert into holes 17 drilled in both end parts of a retaining ring 16 free to open and close by intersecting them on a shaft part 4 and to fit an engagement frame 7 having a rectangular frame hole 6 in the neighbourhood of the shaft part 4 in a state to straddle on both of the handles 3. In this case, engagement tooth parts 8, 8a are formed on outside surfaces of the handles 3 on which the engagement frame 7 is fit, engagement tooth parts 9, 9a to engage with these engagement tooth parts 8, 8a are formed on an inner surface on the short side of the frame hole 6 on the engagement frame 7, one end part of a lever 11 is fixed on either one of the handles 3 by intersecting it, and a stopper free to move in the longitudinal direction and to fix and to make contact with the other handle 3 is provided on this lever 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retaining ring pliers, and more particularly to an improved pliers for fitting or removing a retaining ring from a shaft or a hole.

[0002]

2. Description of the Related Art A retaining ring is an annular member having elasticity which is fitted to a shaft as a stopper for a bearing or the like, or is fitted to a hole for fixing the position of a bearing or the like to form a stopper. Pliers are used to open and close (increase and decrease the diameter) of the retaining ring.

[0003] The pliers are usually provided with a pair of grips provided with pointed ends to be inserted into holes formed at both ends of a retaining ring, and are pivotally mounted so as to intersect with each other. The squeezing is performed by bringing the both ends into close proximity to each other to reduce the diameter of the retaining ring, or to separate the leading ends from each other to expand the retaining ring so as to expand the diameter of the retaining ring. Therefore, after inserting the retaining ring, in order to maintain its reduced or expanded state,
The handle must be held until the fitting (attachment) or the fitting (removal) operation is completed.

However, maintaining a state in which the grip handle is continuously held for a certain period of time becomes a very exhausting factor when a large number of retaining rings are fitted or removed, and the fitting and disengaging of the retaining rings are performed. Not only does it adversely affect work efficiency, but also causes inconveniences such as the snap ring attached to the pointed end jumping out and losing sight if the grip handle swings up and down.

In order to solve such inconveniences, the applicant has provided three kinds of pliers of this type (Japanese Utility Model Publication No. 41-9117 and Japanese Utility Model Application Publication No. 41-41).
No. 16560 and JP-B-47-19319).

Particularly, in Japanese Utility Model Publication No. 41-16560, a locking frame having a long rectangular frame hole is inserted near the intersection of a handle (grip handle) in a state of straddling both handle portions. In addition, a locking device for a snap ring plier is provided in which a required number of graduation lines for knowing a stop position of the locking frame are drawn in an insertion portion of the locking frame in the handle portion.

[0007]

However, according to the retaining ring pliers described above, the retaining frame has a structure in which the retaining frame is simply fitted and inserted into a pair of handles, and the retaining ring is used with the scale line of the handle as a guide. In order to prevent over-reduction or over-expansion, the handle does not have any means of engagement with the locking frame.
Even if it is attempted to restrict the opening of the handle with the locking frame, the locking frame is likely to slide on the handle, and the reduced or enlarged state of the pointed end cannot be maintained.

[0008] Thus, if the diameter of the retaining ring for the shaft is excessively enlarged or the diameter of the retaining ring for the hole is excessively reduced due to excessive tightening of the retaining ring pliers, deformation of the retaining ring is caused, and the retaining ring is deformed. Will result in poor performance.

In view of the above, the present invention is to improve a snap ring plier using the above-mentioned locking frame.

[0010]

According to the present invention, a retaining ring plier according to the present invention includes a pair of grip handles each having a pointed end inserted into holes formed in both ends of the retaining ring. In a retaining ring plier, which is mounted so as to be openable and closable so as to be openable and closable and has a rectangular frame hole in the vicinity of the crossing portion while being straddled over both grip handles, A locking tooth portion is formed on an outer surface of the grip handle with which the fitting is fitted, and an engaging tooth portion engaging with the locking tooth portion is formed on an inner surface on a short side of a frame hole in the locking frame. It is characterized by the following.

[0011] As described in claim 2, a pair of grip handles having pointed ends to be inserted into holes formed in both ends of the retaining ring are crossed and pivotally mounted on the shaft so as to be openable and closable. In a retaining ring plier in which a locking frame having a rectangular frame hole in the vicinity is straddled over both grip handles, the locking frame pliers are locked to the outer surface of the grip handle to which the locking frame fits. A tooth portion is formed, and an engaging tooth portion that engages with the locking tooth portion is formed on the inner surface on the short side of a frame hole in the locking frame, and a lever handle is provided on one of the grip handles. One end is crossed and fixed, and the lever is provided with a stopper movable and fixable in the longitudinal direction thereof and in contact with the other handle.

Therefore, when the pointed end is inserted into each of the holes at both ends of the retaining ring, the grips are squeezed and the diameter of the retaining ring is reduced or enlarged, and the state is fixed by the retaining frame. Are not easily displaced due to engagement of the engaging teeth with the engaging teeth, so that the fitting or unscrewing operation can be performed without holding the grip handle. In addition, the diameter of the reduced or enlarged diameter of the retaining ring held by the locking frame is fixed and stored in the stopper of the lever, so that the diameter of the next retaining ring can be reduced or enlarged under the same conditions as the initial one. Since it is possible, the uniformity of the snap ring fitting or fitting operation can be ensured.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a retaining ring plier 1 is used for reducing the diameter of a retaining ring, and a pair of grip handles 3 each having a replaceable pointed end 2 provided at one end thereof is formed into a circular shaft portion 4.
4 are overlapped with each other to form an X-shaped intersection, and the intersection is attached to a shaft 5 such as a rivet and fastened so as to be openable and closable.
A locking frame 7 having a rectangular frame hole 6 in the vicinity of the intersection is inserted in a state of straddling both grip handles 3 and a spring 15 such as a coil spring for constantly opening the grip handle 3 is provided. The grip handles 3, 3 are elastically mounted between the other end portions.

On the outer surfaces of the grip handles 3, 3 near the intersection, locking teeth 8, 8 such as stepped grooves or saw-tooth portions are provided.
a are formed respectively, and on the inner surface of the short side of the frame hole 6 of the locking frame 7, as shown in FIG.
Engaging teeth 9 and 9a for engaging with 8a are formed. One of the locking teeth 8 and the engaging teeth 9 has a larger tooth shape (deeper valley) than the other locking teeth 8a and the engaging teeth 9a.

Therefore, one of the engaging teeth 8 and the engaging teeth 9 has a high degree of engagement and cannot be easily disengaged after the engagement, but the other engaging teeth 8a and the engaging teeth 9a have a fingertip. So that it can be easily removed by applying force. As shown in FIG. 3, the engaging tooth portion 9 is formed by forming the short side of the frame hole 6 of the locking frame 7 into a blade shape with a substantially triangular cross section, and leaving the engaging tooth portion 9a with a square cross section. However, both may be formed into a blade shape having a substantially triangular cross section, and the acute angle of the blade may be changed to an obtuse angle. In addition, a pin 10 is penetrated and implanted in one handle 3 so that the locking frame 7 moves to the intersection and does not fall off.

One end of a lever 11 is fixed to a substantially middle portion of one handle 3, and the other end has a length extending to the other handle 3 which is opened to the maximum extent. A guide groove 12 is formed along the center line of the lever 11,
A lock bolt 14 tightened by a lock nut 13 is fitted into the guide groove 12 as a stopper, and the lock nut 13 is loosened to lock the lock bolt 14 into the guide groove 12.
The position can be adjusted by moving along. The lock bolt 14 has serrations formed on the outer peripheral surface of its head and has a hexagonal hole into which a hexagonal wrench is fitted. Reference numeral 18 denotes a heat-shrinkable soft film that covers the handle 3 and acts to prevent slippage.

Therefore, when using the pliers 1 to be fitted with retaining rings, when the grip handles 3, 3 are squeezed against the force of the ramming machine 15, the pointed ends 2, 2 come closer to each other to reduce the interval. After that, the sharp ends 2, 2 are inserted into holes 17 formed in both ends of the retaining ring 16, respectively. The frame 7 is moved to the hand side along the handle 3 so that the frame hole 6
By engaging the engaging teeth 9, 9a with the engaging teeth 8, 8a, the opening of the handles 3, 3 is fixed, and the force of the elastic machine 15 is suppressed. Therefore, as shown by the imaginary line in FIG. 2, even when the gripping grips 3 and 3 are released, the grips 3 and 3 are not opened by the force of the bullet 15, so that the retaining ring 16 is moved to the pointed end 2. , 2.

Then, in a state where the handles 3 are opened with the locking frame 7, the lock nut 13 is loosened and the lock bolt 14 is moved toward the other handle 3, and at a position where the two touch each other. The position of the lock bolt 14 is fixed by tightening the lock nut 13. Thus, even if the locking frame 7 is removed and the grip handles 3 and 3 are reopened by the force of the bullet 15, the dimension for reducing the diameter of the retaining ring 16 in the next operation is stored.

That is, by inserting a new retaining ring into the sharp ends 2 and 2 and squeezing it until one grip handle 3 comes into contact with the lock bolt 14, the dimension for reducing the diameter of the new retaining ring is as follows. Since the size is the same as the size when the diameter of the ring is reduced, the uniformity of the operation of fitting a large number of retaining rings is ensured.

When the retaining ring that has already been fitted is to be disengaged, the grip handles 3, 3 are squeezed and the sharp ends 2, 2 are formed at both ends of the retaining ring that is already fitted. In the state of being inserted into the hole, the opening of the grip handles 3, 3 is stopped by the locking frame 7, and the lock nut 13 is loosened to release the lock bolt 1
4 is moved toward the other handle 3, and the lock nut 13 is tightened at the position where the
Of the lever 11 is fixed. Thus, even if the grip frame 7 is removed and the grip handles 3 and 3 are reopened by the force of the ram 15, it is not necessary to set the dimension between the pointed ends 2 and 2 again in the next operation.

That is, for the new retaining ring to be fitted next, the size between the pointed ends 2 is reduced by fitting the first retaining ring by squeezing until the other handle 3 comes into contact with the lock bolt 14. Since it is the same as the case described above, it is only necessary to insert the retaining rings into the holes at both ends of the retaining ring as it is, so that the efficiency of the work of fitting and removing a large number of retaining rings of the same kind is improved.

The retaining ring pliers 1a shown in FIG.
Is for increasing the diameter of a retaining ring, and a pair of grips 3a having exchangeable pointed portions 2a are overlapped with respective shaft portions 4a to form an intersection portion, and the intersection portion can be rotated about a shaft 5 respectively. When the grip handles 3a, 3a are squeezed and squeezed, the tips 2a, 2a are separated from each other. That is, the integral point 2 and the handle 3 of the pliers 1 cross in an X-shape about the axis 5, and the pliers 1 a are integrated with the integral point 2 a and the handle 3.
a is formed so as to extend in the same direction at a predetermined angle about the shaft portion 4a, and therefore a pair of grip handles 3a, 3
Even when the shaft portions 4a and 4a are overlapped and fastened with the shaft 5a, the integral pointed end 2a and the handle 3a do not cross each other, and become substantially H-shaped. The other configuration is the same as that of the pliers 1 for diameter reduction. Therefore, the same portions are denoted by the same reference numerals and overlapping description will be omitted.

Thus, according to the pliers 1, 1a, when a single retaining ring is fitted, the grip handles 3, 2a can be inserted into the holes 17 at both ends of the retaining ring 16, respectively. 3a is squeezed, and the grip handle 7 is used to hold the handle 3,3
With the opening of a stopped, the retaining ring does not come off even if the force to squeeze the grip handles 3 and 3a is released, so that the workability is much better than the conventional one and the work efficiency is improved. . If a large number of retaining rings of the same type must be fitted or removed, the size of the first one reduced or expanded is stored in a stopper, and one handle is applied to this stopper. The contact makes it possible to fit or remove a large number of retaining rings of the same type under the same conditions thereafter, so that the uniformity of the operation can be ensured.

[0024]

According to the present invention described above, the opening of the grip handle can be stopped by the locking frame when the retaining ring is fitted or removed, so that the time for keeping the grip can be omitted. It is a very easy and convenient snap ring pliers.

Further, by stopping the opening of the grip handle with the locking frame and storing it with the stopper of the lever, the next operation can be performed under the same conditions as at the beginning, so that the snap ring is excessively narrowed or expanded. No snapping occurs, and a uniform snap ring fitting or unscrewing operation that does not cause deformation of the snap ring can be ensured.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG. 1;

FIG. 3 is a partially enlarged view of FIG. 2;

FIG. 4 is an external perspective view showing another example of the embodiment of the present invention.

[Explanation of symbols]

 1, 1a: retaining ring pliers 2, 2a: pointed end 3, 3a: handle 6: frame hole 7: locking frame 8, 8a: locking tooth 9, 9a: engaging tooth 10: pin 11: lever 12: Guide groove 13: Lock nut (stopper) 14: Lock bolt (stopper) 16: Retaining ring 17: Hole

Claims (4)

[Claims] An engaging member having a pair of grip handles having sharp ends to be inserted into holes formed at both ends of a retaining ring, which is pivotally mounted on a cross so as to be openable and closable, and which has a rectangular frame hole near the intersection. In a retaining ring plier in which a retaining frame is inserted in a state of straddling both grip handles, a locking tooth portion is formed on an outer surface of the grip handle into which the locking frame is fitted, and the engagement tooth is formed. A retaining ring plier, wherein an engaging tooth portion engaging with the retaining tooth portion is formed on an inner surface on a short side of a frame hole in the locking frame. 2. A pair of grips each having a pointed end to be inserted into holes formed in both ends of a retaining ring, are pivotally mounted so as to cross and intersect with each other, and have a rectangular frame hole near the intersection. In a retaining ring plier in which a retaining frame is inserted in a state of straddling both grip handles, a locking tooth portion is formed on an outer surface of the grip handle into which the locking frame is fitted, and the engagement tooth is formed. An engaging tooth portion that engages with the pawl portion is formed on the inner surface on the short side of the frame hole in the locking frame, and one end of the lever is fixed to one of the grip handles so as to cross, A snap ring plier, wherein the lever is provided with a stopper movable and fixed in the longitudinal direction thereof and abutting on the other handle. 3. The retaining ring pliers according to claim 1, wherein the locking tooth portion formed on the grip handle has a tooth shape of one grip handle larger than a tooth shape of the other grip handle. 4. At least one of the engaging teeth formed on the inner surface on the shorter side of the locking frame is formed by a blade having a shorter side of the locking frame having a substantially triangular cross section. Claim 1,
The retaining ring pliers according to 2 or 3.