Vibration-damping grinding scrapers for rigid metal pins and holders for such grinding scrapers

摘要

PCT No. PCT/SE93/00509 Sec. 371 Date Feb. 21, 1995 Sec. 102(e) Date Feb. 21, 1995 PCT Filed Jun. 9, 1993 PCT Pub. No. WO93/25346 PCT Pub. Date Dec. 23, 1993This invention relates to a vibration dampening grinding cup for handheld grinding machines for the grinding of hard metal buttons on button bits, comprising a grinding head and a shaft made with a common axial channel for cooling medium, which distinguishes in that the shaft is formed with a driver part at its free end and an annular groove between this part and the grinding head, and that a bushing of rubber is arranged on the shaft adjacent to the grinding head, and a holder for such a grinding cup, which distinguishes in that it comprises a substantially cylindrical socket with an axial through channel, whose one end is connected with the rotor of the handheld grinding machine and through the other end of which shaft of the grinding cup is intended to be entered for installing the driver part of the shaft in a correspondingly formed driving part of the channel of the socket and to be fastened through introduction of balls situated in holes in the wall of the socket at the other end of the socket into the annular groove of the shaft at the inner edge of the groove by means of a between two stops axially movable sleeve arranged about the socket and biassed towards the other end of the socket by a spring, whereby the bushing with fastened grinding cup rests elastically against the socket and against the grinding head.