(under subclass 404) Device provided with means acting against the force of gravity for balancing the reciprocating closure during movement or in a selected stop position.
SEE OR SEARCH THIS CLASS, SUBCLASS:
5+, for a counterweighted closure wherein a thermally responsive device disturbs or offsets the balance of the closure and counterweight.
98+, for counterbalancing interconnected closures with additional means to permit independent movement.
119+, for counterbalancing interconnected closures.
150+, for a closure with optional sliding and swinging movements with a counterbalance for both movements.
200, for a counterbalanced closure which has a means to move it from a vertical to a withdrawn overhead horizontal position.
206, for a counterbalanced closure which is mounted on a pivotal link arm to move from a vertical to a withdrawn horizontal overhead position.
386, for a swinging closure with biasing means.
414+, for a biased bearing surface which holds the closure against the force of gravity.
429+, for a sliding closure with a diverse or spring bearing surface which cooperates with counterbalance hardware.
SEE OR SEARCH CLASS
16, Miscellaneous Hardware,
193+, for counterbalance hardware, or a counterbalance cooperating between a frame and a single sash in which there is no recitation of means for mounting the sash for movement.
