Device for raising and lowering loads
Patent 4934660 Issued on June 19, 1990. Estimated Expiration Date: 
October 2, 2007. 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.
October 2, 2007. 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 723231 811440 848905 903433 1636273 1764512 1971511 3759346 Overhead door cable safety device Patent #: 4213019 InventorApplicationNo. 104639 filed on 10/02/1987US Classes:254/394, At least two of the elements having noncollinear axes of rotation182/239, Movable, friction brake element applied by centrifugal force254/267, Having rotational speed governor for generating control impulse to rotation retarding means or drive254/399, Repositionable element supported by cable (e.g., traveling block)254/408With block for element having stationary portion adapted to coact with element to grip cableExaminersPrimary: Matecki, KatherineAttorney, Agent or FirmForeign Patent References
International ClassB66D 003/08AbstractA device for raising and lowering a load has a braking device, brake indicator, and a one-way pulley. The braking device uses a wedge-shaped braking element to stop the advancement of a cord. The brake indicator indicates when the braking device is enabled. The one-way pulley allows the load to be lowered at a steady rate and uses a braking element positioned between a stop pin and a braking surface.Other References
Field of SearchHaving mechanism, actuated by changes in position of drum relative to another component of device, for generating control impulse to rotation retarding means or driveHaving rotational speed governor for generating control impulse to rotation retarding means or drive With mechanism for retarding or preventing cable movement or element rotation At least two of the elements having noncollinear axes of rotation With block for element having stationary portion adapted to coact with element to grip cable Repositionable element supported by cable (e.g., traveling block) With means for retarding unwinding of strand type escape Movable, friction brake element applied by centrifugal force | |
