Releasable retaining means
AssigneeDorgard Limited
InventorAnthony Harold Ernest Welch
Life of this patent
Estimating the term…
Abstract
Means are provided for retaining fire doors in the open position against the action of the spring or other automatic door closers, with remote control release which can be actuated if a fire is detected. In use, one part thereof is mounted on the wall and has gripper means for engagement with another part which is mounted on the door. The wall-mounted part also includes release means spring-biased into a first position in which operation of the gripper means is inhibited and pneumatically operated means for holding the release means in a second position in which operation of the gripper means is not inhibited.
Claims9
Retaining means for controlling displacement of an object from a predetermined position relative to another object, comprising a first part for mounting on one of the objects and a second part for mounting on the other object and having gripper means for engagement with the first part, release means spring-biased into a first position in which operation of the gripper means is inhibited and pneumatically operated means for holding the release means in a second position in which operation of the gripper means is not inhibited.
Dependencies are inferred from the claim text.