A shaft interlock system may have an a interlocking piston that translates a movable locking apparatus configured to interface with a turbine shaft having a fixed locking apparatus. The movable locking apparatus may engage and disengage the fixed locking apparatus. When the movable locking apparatus is engaged with the fixed locking apparatus, the turbine shaft is only able to turn in one direction. When the movable locking apparatus is disengaged from the fixed locking apparatus, the turbine shaft is able to turn in both directions. In this way, a turbine shaft can be prevented from reverse rotation.

Embodiments of clutches for electric tools, and related methods, are disclosed herein. An electric tool may include an electric motor, a drive shaft coupled between the electric motor and a cutting instrument, and a clutch coupled between the electric motor and the drive shaft. The clutch may include a motor portion having an exterior surface, a drive shaft portion having an exterior surface and forming a mated assembly when mated with the motor portion, and a spring around the motor and drive shaft portions. The spring may exert a holding force on the mated assembly, such that rotation of the motor portion in a first direction loosens the spring and reduces the friction holding force until a torque between the motor and drive shaft portions exceeds the holding force, causing rotation of the motor portion to be decoupled from rotation of the drive shaft portion.

Embodiments of clutches for electric tools, and related methods, are disclosed herein. An electric tool may include an electric motor, a drive shaft coupled between the electric motor and a cutting instrument, and a clutch coupled between the electric motor and the drive shaft. The clutch may include a motor portion having an exterior surface, a drive shaft portion having an exterior surface and forming a mated assembly when mated with the motor portion, and a spring around the motor and drive shaft portions. The spring may exert a holding force on the mated assembly, such that rotation of the motor portion in a first direction loosens the spring and reduces the friction holding force until a torque between the motor and drive shaft portions exceeds the holding force, causing rotation of the motor portion to be decoupled from rotation of the drive shaft portion.

A belt pulley decoupler is provided for transmitting a drive torque from the belt of an auxiliary unit belt drive to the shaft of one of the auxiliary units. The decoupler a belt pulley, a hub fixed on the shaft, and a one-way clutch and a coil torsion spring arranged in series in the drive torque flow between the belt pulley and the hub. The spring extends about the axis of rotation of the belt pulley decoupler and widens radially under transmission of a drive torque. The ends of the coil torsion spring contact respective axially ascending ramp-shaped spring support surface of a first spring plate and of a second spring plate. At least one of the spring plates is a sheet metal shaped part having a spring support surface integrally formed thereon.

A belt pulley decoupler is provided for transmitting a drive torque from the belt of an auxiliary unit belt drive to the shaft of one of the auxiliary units. The decoupler a belt pulley, a hub fixed on the shaft, and a one-way clutch and a coil torsion spring arranged in series in the drive torque flow between the belt pulley and the hub. The spring extends about the axis of rotation of the belt pulley decoupler and widens radially under transmission of a drive torque. The ends of the coil torsion spring contact respective axially ascending ramp-shaped spring support surface of a first spring plate and of a second spring plate. At least one of the spring plates is a sheet metal shaped part having a spring support surface integrally formed thereon.

A torque limiter (TL) is provided for torque transmission (TT) to downstream components. The TL includes an input shaft, an output shaft and a torsional spring which is preloadable by a preload torque whereupon the torsional spring is fittable about the output shaft with the output shaft fit about the input shaft. For input shaft rotation, first TT paths proceed from the input shaft to the output shaft through the torsional spring when downstream torque of the downstream components deceeds the preload torque and a second TT path proceeds from the input shaft to an external structure when the downstream torque exceeds the preload torque.

A torque limiter (TL) is provided for torque transmission (TT) to downstream components. The TL includes an input shaft, an output shaft and a torsional spring which is preloadable by a preload torque whereupon the torsional spring is fittable about the output shaft with the output shaft fit about the input shaft. For input shaft rotation, first TT paths proceed from the input shaft to the output shaft through the torsional spring when downstream torque of the downstream components deceeds the preload torque and a second TT path proceeds from the input shaft to an external structure when the downstream torque exceeds the preload torque.

An air turbine starter with a housing; a turbine member located within the housing; a drive shaft operably coupled to the turbine member, and having an interior portion. The air turbine starter output shaft extending between a first end and a second end, the output shaft movable between a first position, where the first end is coupled to the engine, and a second position, where the second end is retained within the interior portion and the first end is uncoupled from the engine. A decoupler assembly is included for decoupling the output shaft from the engine.

An air turbine starter with a housing; a turbine member located within the housing; a drive shaft operably coupled to the turbine member, and having an interior portion. The air turbine starter output shaft extending between a first end and a second end, the output shaft movable between a first position, where the first end is coupled to the engine, and a second position, where the second end is retained within the interior portion and the first end is uncoupled from the engine. A decoupler assembly is included for decoupling the output shaft from the engine.

In accordance with one embodiment, a leadless implantable medical device (LIMD), compromises a hermetic housing that has a distal portion and proximal portion. An electrode is proximate to the distal portion. An electronics package is disposed in the housing, in which the electronics package is configured to generate and deliver stimulation signals to the electrode. A fixation mechanism is disposed on the distal portion of the housing. A torque mechanism is disposed on the proximal portion of the housing. The torque mechanism has a tool engagement element movably coupled to the housing. The tool engagement element has a rotational force applied thereto during implant. The torque mechanism includes a torque limiter that maintains a fixed relation between the tool engagement element and the housing when in an engaged state. The torque limiter changes from the engaged state to a disengaged state when the rotational force exceeds a predetermined torque limit.