Hand-held grinding tool with air motor - has two L=shaped pivoted throttle valve members with centrifugal weights closing against spring

摘要

The centrifugally operated throttle valve assembly is for an air supply to an air motor driving a hand-held pneumatic tool. Two L-shaped closure members (17,18) have sides (25,27) which between them define a throttle opening. The members are each swivelable via a bush (22) on a member pivoting on a pin (20) on a disc (16) rotating with the motor shaft. - The sides (27) carry centrifugal weights (28) connected by a spring (19) acting against the closing direction of the members, which have respective faces (31,32) in mutual sliding engagement. Each bush contains a central bearing ball in a recess in its closed end to engage the end of the corresponding pin