Releasable bolt devices for securing doors
OwnerJames C. King, Michael A. Cooperinventors
Life of this patent
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Abstract
A releasable bolt device 1 for securing an emergency exit door 2 comprises a support structure 3 of box-like form, a bolt member 4 slidably mounted on the structure 3 for movement relative thereto, a compression spring 5 for urging the bolt member 4 away from the door-securing position, a frangible keep member 6, and a plate 7 for retaining the keep member 6 in place whereby its presence maintains the bolt member 4 in a door-securing position. The frangible keep member 6 is weakened locally so that it may be deliberately broken at that locality by manual force applied to it, whereby the bolt member 4 is moved out of its door-securing position by the spring 5.
Claims12
A releasable bolt device for use in combination with a bolt keeper to secure a door comprising a support structure, an elongate bolt member mounted on the support structure for slidable movement relative thereto along a path coextensive with the longitudinal axis of the bolt member, between a door-securing position in said bolt keeper and a door-releasing position withdrawn from said bolt keeper, biasing means for urging the bolt member away from said door-securing position, a frangible keep member and means for retaining the keep member in place whereby it obstructs movement of the bolt member by the biasing means in a direction away from the door-securing position, the frangible member being weakened locally so that it may be deliberately broken at that locality by manual force applied to it, releasing said bolt member and allowing the bolt member to move out of its door-securing.
Dependencies are inferred from the claim text.