Abstract: A passive explosion barrier is provided for use in mining operations in suppressing mine explosions. The barrier basically comprises a receptacle or tub which contains an explosion suppressing substance, such as water, and is mounted on a frame adjacent to the roof of the mine. The tub includes a pair of integral support lips at the front and rear edges thereof which are beveled at the sides and which constitute the sole support for the tub. In operation, wind from an explosion will cause the lip disposed toward the explosion to distort and curve inwards and disengage from the frame so that the tub falls, pivoting about the other lip. In an alternative embodiment, the sides of the tub are more flexible than the lips of the tub, and distortion of the sides in response to wind forces causes disengagement of the lip facing the explosion.

Abstract: A trigger device for an explosion barrier includes a pressure sensor and at least two flame sensors. The pressure sensor energizes the flame sensors in response to a predetermined pressure rise, and the explosion barrier is triggered when a flame is detected by both flame sensors. The flame sensors are oriented at different angles in order to prevent false firing by miner's lamps, etc.

Abstract: A passive explosion barrier for suppressing the effects of an explosion in a mine gallery, or the like, comprises a receptacle containing an explosion suppressing substance adapted to be supported by framework adjacent the mine roof. In one embodiment, a corrugated face plate is hinged to the base of the receptacle on one side thereof. First and second support flanges are formed respectively on the upper end of the face plate and on the rim of the receptacle on the side thereof opposite the plate. The receptacle is mounted to the framework with the support flanges resting on first and second beams and with the face plate viewing the explosion source and oblique to a horizontal plane. The weight of the receptacle, and friction between the face plate flange and first beam, prevent the receptacle from releasing due to accidental disturbances. However, the force of wind accompanying an explosion acts against the face plate, causing it to both lift from the first beam and pivot toward the receptacle.

Abstract: A pressure sensitive exposion barrier which is activated by a static pressure rise. A liquid tight housing with a latched door contains the explosive suppression agent, usually water, until activation takes place. Upper hinges on the door allow it to be pivoted outwardly and its agent released. Normally a latch keeps the door locked until the pressure rise from the explosion causes a connected bellows assembly to be depressed. Once depressed, the latch is released and the door is forced outwardly by a biasing member to release the agent before the explosion arrives.