(under subclass 381) Device provided with means for urging or retaining the closure to an open or a close position by a biasing action thereon, e.g., spring weight.
SEE OR SEARCH THIS CLASS, SUBCLASS:
21+, for closure biased to a desired position, and having means responsive to the presence of a fluid to move the closure against the action of the biasing means.
60, for a closure having a biasing means, such as a spring, in which energy is stored by the operation of an animal scarer while the closure is being opened, and which means urges the closure to a closed position.
89, for a biasing means for interconnected lower type closures.
197+, for a means to bias a closure from a vertical to a withdrawn horizontal overhead position. 236+, for a swinging closure having multidirectional opening and closing movement in which one direction is against the force of gravity to bias the closure to move oppositely; e.g., rising hinge type.
273+, for a load maintained; self-returning pedal or treadle actuated closure.
379, for a latch release, self-returning closure.
SEE OR SEARCH CLASS
16, Miscellaneous Hardware,
277+, for resiliently biased hinges; and subclass 71 for closer hardware.
248, Supports,
417, for a biased or self-returning rotating stand.
