Torque responsive, dual speed rotary power driver
Patent 4300641 Issued on November 17, 1981. Estimated Expiration Date: 
February 21, 1999. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 21, 1999. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3438451 3897834 InventorAssigneeApplicationNo. 06/013073 filed on 02/21/1979US Classes:173/177, Fluid pressure change controls drive81/57.22, Multiple drive or driven means91/59, TORQUE RESPONSIVE MOTIVE FLUID CONTROL92/136, WITH TOOTHED GEAR, SPLINE OR THREAD RIGID WITH WORKING MEMBER92/33Element extends through working member portionExaminersPrimary: Mackey, Robert R.Attorney, Agent or FirmInternational ClassesB25B 21/00 (20060101)B25B 23/14 (20060101) B25B 23/145 (20060101) Foreign Application Priority Data1978-02-23 DEAbstractA rotary power driver is provided which drives with a two-stage torque and speed control, wherein the initial driving is done at higher speed and lower torque, and a subsequent higher torque is automatically imposed with lower speed. The second stage is a selected pre-set stage, with provision for the selected torque built into the driver. The second stage is imposed on the drive shaft by a one-way clutch or ratchet drive. | |
