Automatically speed adjusting ratchet wrench

A power rotary hand tool, said tool comprising:

• a drive shaft operatively connectable to a load;
• and
• a two-piece planet carrier operatively connected to the drive shaft of the tool, said planet carrier comprising:
• a drive portion having an axis of rotation and fixedly mounted to a motor rotor of the tool;
• and
• a pinned portion including a base and a crank pin extending eccentrically from the base, the crank pin having a center axis and operatively connected to the drive shaft to provide rotation and torque to the drive shaft upon orbital rotation of the crank pin about the drive portion axis of rotation, the pinned portion rotatably engaged with the drive portion such that rotation of the rotor will cause the drive portion and the pinned portion to rotate relative to each other as a function of a load applied to the drive shaft such that an offset between the crank pin center axis and the drive portion axis of rotation is variable as a function of the load applied to the drive shaft, wherein the variance of the offset will vary a rotational speed and an amount of torque delivered to the drive shaft as a function of the load at drive shaft.

A bidirectional hand held power ratchet drive tool, said tool comprising:

• a drive shaft fixedly connected to a drive gear;
• a pair of opposing pawls pivotally connected a drive link, each pawl operatively engageable with the drive gear to rotate the drive shaft in response to oscillatory lateral movement of the drive link;
• and
• a two-piece planet carrier comprising:
• a drive portion having an axis of rotation and fixedly mounted to a motor rotor of the tool;
• and
• a pinned portion including a base and a crank pin extending eccentrically from the base, the crank pin having a center axis and rotatably connected with the drive link to provide the oscillatory lateral travel of the drive link upon orbital rotation of the crank pin about the drive portion axis of rotation, the pinned portion rotatably engaged with the drive portion such that rotation of the rotor will cause the drive portion and the pinned portion to rotate relative to each other as a function of a load applied to the drive shaft such that an offset between the crank pin center axis and the drive portion axis of rotation is variable as a function of the load applied to the drive shaft, wherein the variance of the offset will vary a speed and a length of the oscillatory lateral travel of the drive link, thereby varying a rotational speed and an amount of torque delivered to the drive shaft as a function of the load at drive shaft.