| 摘要 |
A power tool comprises a housing, and a drive unit supported by the housing for pivoting movement about an axis D28, the drive unit being operable to drive a tool element to work on a work piece. A detent assembly B82 is provided, which is operable to position the drive unit relative to the housing in a selected angular position. A locking assembly B30 is operable to lock the drive unit in the selected angular position, and includes a brake surface B38 defined by one of the housing and drive unit, and a brake member B42 supported by the other of the housing and drive unit. The brake member is movable relative to the brake surface between a braking position, in which the brake member applies a friction force to the brake surface to lock the drive unit in the selected angular position relative to the housing, and a release position, in which the drive unit is movable relative to the housing. A biasing member (B66, fig 67C) is operable to bias the brake member to the braking position, and an actuator assembly (B46, fig 71A) is provided, which is operable to disengage the detent assembly and cause movement of the brake member against the bias of the biasing member at least from the braking position to the release position. |
