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High-low speed rotary drive mechanism for rotatably driving driven elements of a tool, for example a hydraulic chuck, while permitting axial movement of the driven elements relative thereto, said mechanism including a housing, a tubular spindle rotatably mounted by the housing top and bottom walls,

High-low speed rotary drive mechanism for rotatably driving driven elements of a tool, for example a hydraulic chuck, while permitting axial movement of the driven elements relative thereto, said mechanism including a housing, a tubular spindle rotatably mounted by the housing top and bottom walls, drive lugs joined to the spindle inner peripheral wall for driving the driven elements, an axially lower main drive gear fixed to the spindle to drive the spindle, a reversible hydraulic motor mounted on the housing for driving the main drive gear at high speed, low torque, an upper gear mounted on the spindle between the lower gear and the top wall for rotation relative the spindle, an elongated rack having teeth intermeshing with the upper gear for driving the upper gear at high torque, low speed, and a poppet type ratchet assembly mounted by the upper gear to rotate therewith. The ratchet assembly includes a ratchet member that in one angular position relative the upper gear is axially movable into a lower gear aperture to transmit a driving force from the upper gear when the upper gear is driven in one angular direction and permit the upper gear rotating relative the lower gear in the opposite angular direction, and a second angular position axially movable into a lower gear aperture to transmit a driving force to the lower gear when the upper gear is driven in the opposite angular direction.

대표청구항 ▼

Apparatus for use in drivingly rotating a driven member, comprising a frame, first annular means rotatably mounted on the frame for surrounding at least a part of the driven member, said first annular means having a first annular ring gear portion, a motor mounted on the frame and having a driven ro

Apparatus for use in drivingly rotating a driven member, comprising a frame, first annular means rotatably mounted on the frame for surrounding at least a part of the driven member, said first annular means having a first annular ring gear portion, a motor mounted on the frame and having a driven rotary motor shaft, means mounted on the motor shaft to drivingly rotate the ring gear portion, a ring gear mounted on the first annular means for rotation relative thereto, an elongated rack reciprocally mounted on the frame in driving engagement with the ring gear, piston cylinder means mounted on the frame for reciprocating the rack, and means mounted by the ring gear for rotation therewith for transmitting a rotary driving force in one angular direction from the ring gear to the gear portion when the ring gear is drivingly rotated in said one angular direction and permit said ring gear portion to be drivenly rotated relative the ring gear in said one angular direction and means on the annular means for drivingly rotating said driven member when the ring gear portion is drivenly rotated in said one angular direction.