Portable mechanical alarm for doors, windows and the like

Claim 1

A portable alarm for selective, temporary attachment adjacent a closure such as a door, window, or the like, and useful for indicating unauthorized entry into said closure, comprising in combination: a housing; a bell casing mounted in said housing; a clacker arm rotatably mounted within said casing and adapted to strike the inner periphery of said casing responsive to rotation thereof to create an audible signal; means for rotating said clacker arm; a trigger arm rotatably mounted with an end thereof adjacent a side of said housing and having the other end thereof extending into said casing and adjacent said clacker arm; first biasing means for biasing said other end of said trigger arm in a first direction against said clacker arm to prevent rotation thereof; an actuator having a lever arm and a pressure plate, said actuator pivotably mounted along an edge of said housing such that said lever arm extends outside said housing, and with said pressure plate dimensioned so as to cooperate with said lever arm to move said trigger arm in a second direction opposing said first direction responsive to movement of said lever arm; second biasing means for biasing said actuator plate contact with said trigger arm; and wherein a force caused by movement of the closure against said lever arm substantially in said first direction causes said lever arm to overcome said second and first biasing means, respectively, and forces said other end of said trigger arm out of engagement with said clacker arm, thereby effecting said audible signal.