Importance

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Abstract

An improved heat sensitive cut-off for blocking the flow through a gas conduit or the like of the type comprising first and second cut-off members disposed in the conduit which co-operate to block flow through the conduit when they are brought together. The first cut-off member has a socket therein. A spring biases the cut-off members together, and a spacer between the cut-off members for separates them to permit flow through the conduit. The spacer has a portion penetrating partway into the socket in the first cut-off member. A plug of a relatively low melting point material is located in the bottom of the socket for temporarily preventing the spacer from penetrating further into the socket. The socket and the spacer are configured so that when the plug melts the spacer can penetrate further into the socket sufficiently that the spring can move the cut-off members together to block the flow through the conduit. The first cut-off member and the spacer are secured together mechanically or with an adhesive to prevent them from separating and interfering with the proper operation of the cut-off.

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First Claim