Abstract: A removal and installation device for external and internal snap rings that can switch between shaft and hole modes by simple operation and produces better controllability, workability, serviceability and easiness in handling is provided. A rotary plate is rotated in a positive direction, a left side lever is turned as a shaft part is rotated integrally with the rotary plate, right and left side levers are crossed substantially in an X shape, the crossed parts supported by the shaft part, realizing the hole mode. The rotary plate is rotated in reverse direction, the left side lever is turned in a reverse direction as the shaft part is rotated in a reverse direction integrally with the rotary plate, both pivot parts of the right and left side levers arranged substantially in a V shape supported by the shaft part so that both projected working tools are parallel, realizing the shaft mode.

Abstract: An object of the present invention is to provide a collet chuck in which a chuck section of a collet is so formed as to provide a greater chucking force when the collet chuck is turned. To accomplish this object, a collet chuck is provided in which a collet mounted on the axis of rotation of a rotating element which rotates in one direction, and having a chuck section which is guided for closing by a guide section of a retainer which is interposed between the rotating element and the collet and moves on the axis of rotation, is adapted to hold a member to be chucked by inserting into an insertion hole of the collet, and the chuck section of the collet is formed in a spiral configuration having a plurality of slits cut from one end of the retainer side and in the opposite direction of rotation along the direction of the axis of rotation.

Abstract: A device for attaching/detaching a snap ring, which can be set up in either of types for shaft and hole applications only by one operation of turning right and left leading portions removably inserted in holes at both ends of a snap ring.