Hand hoist
Patent 4251060 Issued on February 17, 1981. Estimated Expiration Date: 
August 10, 1998. 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.
August 10, 1998. 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 1572001 3047114 3626499 3776514 InventorsAssigneeApplicationNo. 05/932824 filed on 08/10/1978US Classes:254/356, With means for preventing or retarding rotation of drum in at least one direction192/16, Clutch and brake same member254/345Shiftable into and out of intermeshing engagementExaminersPrimary: Taylor, Billy S.Attorney, Agent or FirmInternational ClassesB66D 3/00 (20060101)B66D 3/14 (20060101) Foreign Application Priority Data1977-12-20 JPAbstractA hand hoist comprises a brake support member (1) for supporting brake plates (24, 25) and firmly mounted on a driving shaft (20) detachably connected through gears to a load pulley (32). A brake biasing member (2) is threadedly engaged on the brake support member by means of a ball screw (43-45), and a retainer ring (3) is fixed to an outer surface of the brake biasing member. A friction transmission ring (5) having a frusto-conical friction outer surface (4) is non-rotatably fitted on the retainer ring, and a manually rotated member (6) for rotating the brake biasing member relative to the brake support member includes a frusto-conical inner surface (7) mating with the frictional outer surface of the transmission ring. Belleville springs (9) urge these frusto-conical surfaces against each other, and they are made of different metals, such as steel, bronze or brass. The retainer ring is provided at its end with a plurality of rotation preventing protrusions (47) circumferentially equally spaced apart, side edges of which abut against pins ( 12,13) planted in holes of the friction transmission ring. | |
