Bit retention assembly for rotary hammer
AssigneeMilwaukee Electric Tool Corporation
InventorsTroy C. Thorson, Jeremy R. Ebner
Life of this patent
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Abstract
A rotary hammer includes a motor, a spindle coupled to the motor for receiving torque from the motor, a piston at least partially received within the spindle for reciprocation therein, and an anvil received within the spindle for reciprocation in response to reciprocation of the piston. The anvil imparts axial impacts to a tool bit in response to reciprocation of the piston. The rotary hammer also includes a bit retention assembly for securing the tool bit to the spindle. The bit retention assembly includes a collar with an indicator thereon. The indicator is at least partially visible to a user of the rotary hammer when the tool bit is improperly inserted within the spindle.
Claims20
A rotary hammer adapted to impart axial impacts to a tool bit, the rotary hammer comprising:
- a motor;
- a spindle coupled to the motor for receiving torque from the motor;
- a piston at least partially received within the spindle for reciprocation therein;
- an anvil received within the spindle for reciprocation in response to reciprocation of the piston, the anvil imparting axial impacts to the tool bit in response to reciprocation of the piston;
- and
- a bit retention assembly for securing the tool bit to the spindle, the bit retention assembly including
- a front collar held stationary in both forward and rearward axial directions relative to the spindle and having a circumferential lip, and
- a rear collar with an indicator thereon that is movable with the rear collar, the indicator being unshrouded by the circumferential lip and at least partially visible to a user of the rotary hammer when the tool bit is improperly inserted within the spindle.
Dependencies are inferred from the claim text.