| 摘要 |
A hand-held grinding tool comprises a housing 12, a motor 24 and an angular gear 37 located in the housing, and a grinding plate 30 on one side of the housing. The angular gear comprises a pin 36 eccentrically mounted on a drive shaft 32 of the motor and the outer ring 40 of a roller bearing 42 arranged with its axis of rotation parallel to the plane of the grinding plate. The eccentric pin is located in a slot 38 on the outer ring which is reciprocated about its axis of rotation as the eccentric pin rotates. A cam 46 is mounted on the outer ring, is offset by 90 degrees from the slot and engages with an opening 48 in the plate. Rotation of the drive shaft is transformed via pivoting motion of the outer ring into linear reciprocation of the opening in the plate. Use of an eccentric coupling 49 between the plate and housing enables the plate to perform an orbital motion. |
