Power tools with reversible, self-shifting transmission
AssigneeIngersoll-Rand Company
InventorsWarren Andrew Seith, Aaron Michael Crescenti
Life of this patent
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Abstract
Illustrative embodiments of power tools with reversible, self-shifting transmissions are disclosed. In at least one illustrative embodiment, a power tool may comprise a motor having a motor shaft, an output shaft configured to be coupled to a tool element to rotate a fastener, and a transmission coupled between the motor shaft and the output shaft to transmit rotation from the motor shaft to the output shaft in a low-speed, high-torque mode and in a high-speed, low-torque mode. The transmission may be configured to self-shift between the low-speed, high-torque mode and the high-speed, low-torque mode in response to a change in a torque required to rotate the output shaft in both a clockwise direction and a counterclockwise direction.
Claims20
A power tool comprising:
- a motor having a motor shaft;
- an output shaft configured to be coupled to a fastener to rotate the fastener;
- and
- a transmission coupled between the motor shaft and the output shaft to transmit rotation from the motor shaft to the output shaft in a low-speed, high-torque mode and in a high-speed, low-torque mode, wherein the transmission is configured to self-shift between the low-speed, high-torque mode and the high-speed, low-torque mode in response to a change in a torque required to rotate the output shaft in both a clockwise direction and a counterclockwise direction.
A power tool transmission comprising:
- an output shaft;
- a centrifugal clutch;
- a speed-reduction gear set;
- and
- a bi-directional overrunning clutch coupled between the centrifugal clutch and the output shaft and coupled between the speed-reduction gear set and the output shaft.
Dependencies are inferred from the claim text.