Patent ID: 8985644
Filing Date: 2015-03-24
Classification: E05B,F15B,Y10T

Abstract:
1. A barrier release mechanism for a barrier construction which includes a barrier and a barrier frame, the barrier release mechanism comprising: at least one barrier latch having a latching position and an unlatching position and biasing means to bias the at least one barrier latch towards the unlatching position, the barrier release mechanism further including: a latch actuation device which is disposed adjacent to the barrier construction and movable between an engaged position in which the latch actuation device is in abutment with the at least one barrier latch to urge the at least one barrier latch against the bias of the biasing means into the latching position to cause the barrier to be constrained, and a disengaged position in which the latch actuation device enables the at least one barrier latch to be moved by the biasing means from the latching position to the unlatching position whereby the at least one barrier latch does not cause the barrier to be constrained; a source of fluid pressure in fluid communication with the latch actuation device; and a pressure control valve disposed fluidly intermediate the latch actuation device and the source of fluid pressure, the pressure control valve being configured for controlling pressure applied from the source of fluid pressure to the latch actuation device; wherein biasing of the at least one barrier latch with the biasing means is independent from the latch actuation device; and wherein the application of a predetermined fluid pressure from the source of fluid pressure to the latch actuation device causes the latch actuation device to move into the engaged position and a predetermined reduction of fluid pressure to the latch actuation device allows the latch actuation device to move to the disengaged position.