Collision detection device

Claim 1

A collision detection device comprising: a. a casing; b. a mass disposed within said casing in such a way that said mass is deflected under acceleration or deceleration within a predetermined angle including the direction of the movement of the vehicle; c. pressure means for pressing said mass; d. a first fixed contact and a second fixed contact both fixed within said casing so as to be electrically isolated from each other; e. a contact coil spring interposed between said first and second contacts in such a way that said contact spring can be deflected only in the direction of the movement of the vehicle when said mass is deflected, said contact spring having one end portion in contact with said second fixed contact; and f. a column-shaped member fixed to said mass and extended through said first fixed contact to press said contact spring in the direction opposite to the direction of the movement of the vehicle, by the force of said pressure means, said column-shaped member having a stepped portion for receiving one end smaller than the diameter of said contact spring, said stepped portion being normally brought into contact with a portion of another end of said contact spring so that the remaining portion of the same end of said contact spring, which is normally not in contact with said stepped portion can be brought into contact with said first fixed contact when said mass is deflected.