JPH0141558Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention consists of a retaining ring that holds an endless abrasive belt on its outer circumferential surface by passing a shaft through a shaft hole through the center and holding it with a nut. The present invention relates to a retaining ring for an endless abrasive belt which can press and hold the endless abrasive belt on its outer circumferential surface when in use and can remove the endless abrasive belt from the outer circumferential surface when not in use.

(Prior art) Conventionally, as a retaining ring for this kind of endless abrasive belt,
A number of rubber elastic extensible bodies with a hollow trapezoidal cross section are attached to the outer circumferential surface of the inner ring, a rubber tube extensible body pressurized with air is attached to the outer circumferential surface of the inner ring, or a sponge elastic body is attached to the outer circumferential surface of the inner ring. It is known that the expandable body expands in the outer circumferential direction due to centrifugal force during rotation, thereby compressing and holding the endless abrasive belt. but,
The first is that during high-speed rotation, the outer circumferential surface of each expandable body curves individually, making it impossible to form a flat abrasive belt holding curved surface as a whole, and when rotating at low speed, the hypotenuse of the expandable body has a hollow trapezoidal cross section. The part acts as a relatively hard holding part and applies continuous impact to the object to be polished.
There is a drawback that uniform polishing cannot be obtained, and the second method has the drawback that when it hits the object to be polished during use, it bounces a lot, leaving an unpolished surface and sometimes causing punctures.Furthermore, the third method has the drawback that had the inconvenience of being limited to low-speed rotation because the sponge would peel off or break from the inner ring during high-speed rotation.

(Problems to be solved by the invention) This invention maintains a flat abrasive belt holding surface during both high-speed and low-speed rotation, guarantees even polishing, and is suitable for endless abrasive belts with almost no peeling or breakage. The purpose is to provide a retaining ring.

(Means for Solving the Problems and Their Effects) In order to achieve the above object, the present invention provides a retaining ring for an endless abrasive belt whose shaft is passed through a shaft hole penetrating through the center and tightened with a nut. If the ring is a disk body made of solid elastic rubber, and its outer peripheral surface is a cross section, it forms a concave curved surface when no compressive force is applied by tightening the nut, and when compressive force is applied by tightening the nut. teeth,
In response to the compressive force, the elastic rubber is deformed to form a flat outer circumferential surface.

Therefore, when an endless abrasive belt is placed on the outer circumferential surface of the retaining ring and then the nut is tightened, the elastic rubber disk is deformed by the compressive force and its outer circumferential surface becomes a flat surface, which securely holds the abrasive belt. It will be held at After use, when the nut is loosened, the retaining ring shrinks to its original diameter due to its elastic recovery force, allowing the abrasive belt to be removed.

(Example) In FIGS. 1 and 2, a retaining ring 1 is a solid disk made of elastic rubber such as natural rubber or synthetic rubber, and has a round shaft hole 2 in its center. The boss portion 3 around the disc and the rim portion 4 on the outer periphery are formed to be slightly thicker than the disc body, and the outer peripheral surface of the rim portion 4 is gently concavely curved 5 in cross section.

In use, two metal sleeves 6 are placed within the shaft hole 2, each having an outer diameter approximately equal to the diameter of the shaft hole 2 and a length slightly shorter than half the length of the shaft hole.
6, the shaft 7 having a flange portion 8 and a male threaded portion 9 at the front thereof passes through the sleeves 6, 6, and the flange portion 8 is brought into contact with one side of the boss portion 3 of the retaining ring 1. At the same time as tightening nut 10 on the other side
is in contact with the nut 10 through the washer 11.
into the male threaded portion 9. In that state, retaining ring 1
The endless abrasive belt B is hung on the outer peripheral surface of the ring, and then the nut 10 is strongly tightened and the boss portion 3 of the retaining ring is strongly pressed from left and right between the flange portion 8 and the washer 11. When the boss portion 3 is compressed in the pressing direction, the boss portion 3 is compressed. (longitudinal strain), and at the same time elongation (lateral strain) in a direction perpendicular to the pressing direction, and due to the generation of this lateral strain, the entire retaining ring 1 is evenly expanded and deformed in the outer circumferential direction, and the abrasive belt B is held under pressure. .

If you want to remove the abrasive belt B after use or replace it with a new one, loosen the nut 10, and the elastic recovery force of the rubber will eliminate the longitudinal and lateral distortion, and the entire retaining ring 1 will shrink to its original diameter. Belt B can be removed slightly.

Another embodiment shown in FIG. 3 is an example in which the boss portion 3a and the rim portion 4a are formed to have the same thickness as the disk body.
(Effect of the invention) The retaining ring for an endless abrasive belt of this invention is a solid disc made of elastic rubber, and when the outer peripheral surface is taken in cross section, it is concave when no compressive force is applied by tightening the nut. It has a curved surface, and when compressive force is applied by tightening the nut, the elastic rubber deforms to a flat outer peripheral surface in response to the compressive force. If the boss portion is compressed through the ring, the entire retaining ring expands and deforms uniformly in the outer circumferential direction, forming a flat abrasive belt retaining surface.Moreover, the retaining surface remains stable during both high-speed and low-speed rotation. This makes it possible to hold the abrasive belt with equal pressure on the entire circumference and achieve even polishing.On the other hand, because it has a structure made of solid elastic rubber, it is different from the conventional one. There is almost no peeling or damage, and when the nut is loosened, the elastic recovery force of the rubber causes the entire retaining ring to shrink to its original diameter, making the belt removable.The structure is simple.
It is easy to manufacture and economically advantageous.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; FIG. 1 is a longitudinal sectional view of the device attached to a shaft, FIG. 2 is a partially cutaway side view, and FIG. 3 is a longitudinal sectional view of another embodiment. 1, 1a...Retaining ring. 2, 2a... shaft hole, 5,
5a...Concave curve. 7...Shaft, 10...Tightening nut.

Claims (1)

[Scope of Claim for Utility Model Registration] A holding ring for an endless abrasive belt whose shaft is passed through a shaft hole penetrating through the center and tightened with a nut, the holding ring being a disk body made of solid elastic rubber, When the outer peripheral surface is viewed in cross section, it forms a concave curved surface when no compressive force is applied by tightening the nut, and when compressive force is applied by tightening the nut, the elastic rubber deforms in response to the compressive force. A retaining ring for an endless abrasive belt, characterized in that it is formed to have a flat outer peripheral surface.