Patent ID: 7178548

Claim:
A dry safety device for an inflammable gas, comprising: a case main body having a gas passage formed therein which has a primary side open port connectable to a supply source of inflammable gas during use of the dry safety device and a secondary side open port connectable to a burner torch; a spindle movable between a secondary side position where the gas passage is opened and a primary side position where the gas passage is closed; a spindle spring for urging the spindle toward the secondary side position and permitting the spindle to move toward the primary side position by a pressure of a counter flow of inflammable gas directed from the secondary side open port toward the primary side open port; a flame-extinguishing filter disposed near the secondary side open port for extinguishing a back fire that may occur together with the counter flow of inflammable gas; a shutoff valve disposed in the gas passage at a position nearer to the primary side open port than to the filter and movable to an extended position for closing the gas passage and being temporarily fixed in a retracted position by a low temperature-melting material so that when an ambient temperature becomes higher than a given value, the low temperature-melting material is melted to permit the shutoff valve to move to the extended position; and a shutoff valve spring for urging the shutoff valve toward the extended position.