Double-ended Spring Patents (Class 70/DIG54)
  • Patent number: 4682484
    Abstract: A tumbler plate cylinder lock having a hollow housing, a cylinder rotatably mounted into the housing, and a plurality of sheet-like locking members, or tumbler plates, snugly fitted in the cylinder. Each two locking members is interlocked by an arciform-shaped spring in such a manner that one extension of each locking member will be urged to extend out of a corresponding passage formed on the peripheral wall of a center bore of the cylinder and into a respective longitudinal slot formed on the inner peripheral surface of the housing, thus the cylinder is prevented from turning relative to the housing, whereby the cylinder lock is held in a locked position. Each locking member has a central opening for receiving a key having a shank provided with a plurality of depressions, and the central opening has a side wall provided with a projection to match a corresponding depression of the key shank.
    Type: Grant
    Filed: April 15, 1986
    Date of Patent: July 28, 1987
    Inventor: Ching-Hsuan Yeh
  • Patent number: 4287732
    Abstract: A key-actuated padlock comprises a shackle, a case to receive the shackle d a flat, substantially U-shaped spring within the case. One leg of the spring serves as a bolt to restrain the movement of the shackle and the other leg serves as an ejector, urging the shackle out of engagement with the bolt leg. The bolt leg is formed to receive a key to unlock the padlock.
    Type: Grant
    Filed: August 27, 1979
    Date of Patent: September 8, 1981
    Assignee: Presto Lock Company, Division of Walter Kidde & Company, Inc.
    Inventor: Richard C. Remington