Patent ID: 8764516

Claim:
A hand held machine for grinding and like operations, comprising: a housing; a motor mounted in the housing and which rotates an axle connected to a tool carrying mechanism; a front bearing arrangement which is provided between the housing and the axle, and which includes a front bearing and a vibration insulator which is resilient to radial displacement of the axle, wherein the vibration insulator comprises at least one resilient element located between the housing and the front bearing; an end cap ring to secure the front bearing arrangement inside the housing; and an adjustment mechanism which is captive between the end cap ring and the housing and which interacts with the at least one resilient element to adjust a resilience thereof; wherein the adjustment mechanism comprises a rotatable actuator which actuates an annular compressing element provided in the housing; and wherein the rotatable actuator is movable to: (i) a first end position where the compressing element is retracted from the resilient element which allows full flexibility of the resilient element to obtain a vibration insulation state of the axle in relation to the housing, and (ii) a second end position where the compressing element is advanced towards and engaging the resilient element compressing the resilient element to such a degree that it is substantially non-resilient to obtain a rigid holding state of the axle in relation to the housing.