Window alarm particularly useful with metal windows

Claim 2

An alarm system comprising a source of electric power, an electrically responsive alarm means, and switching means, mounted within a housing and electrically connected in a series circuit; said housing being encloseD with an opening on one side only, said switching means including one actuating element biased to project beyond said opening and being operative to open said series circuit when depressed, and mounting means aligned with said actuating element within the periphery of said opening for securing said one side to a surface.

Claim 3

An alarm system comprising a source of electric power, an electrically responsive alarm means, and switching means, mounted within a housing and electrically connected in a series circuit; said housing being enclosed with an opening on one side only; said switching means including one actuating element biased to project beyond said opening and operative to open said series circuit when depressed, and a second actuating element biased to project beyond said opening, said actuating elements each controlling separate normally closed electric contacts which are electrically connected in parallel with each other, said actuating elements being disposed different distances from a side of said housing that is contiguous to said one side.

Claim 4

An alarm system comprising a source of electric power, an electrically responsive alarm means, and switching means, mounted within a housing and electrically connected in a series circuit; said housing being enclosed with an opening on one side only; said switching means including one actuating element biased to project beyond said opening and operative to open said series circuit when depressed, and a second actuating element biased to project beyond said opening, said actuating elements each controlling separate normally closed electric contacts which are electrically connected in parallel with each other, said actuating elements being disposed different distances from a side of said housing that is contiguous to said one side.

Claim 5

An alarm system as defined in claim 2, including further switching means serially connected with said source of electric power and said alarm means and selectively operative to interconnect either of said normally closed electric contacts in said series circuit.

Claim 6

An alarm system as defined in claim 3, wherein said further switching means is disposed the same distance from said contiguous side of the housing as one of said actuating elements, and within said opening.

Claim 7

An alarm system as defined in claim 1, wherein said housing has walls extending from said one side, said switching means includes a second actuating element biased to project beyond said opening, said actuating elements disposed different predetermined distances from one of said walls, separate normally closed electric contacts each controlled by one of said actuating elements, and means selectively connecting either of said normally closed contacts in said series circuit.

Claim 8

An alarm system as defined in claim 5, wherein said housing is metallic.

Claim 9

An alarm system as defined in claim 1, in combination with a metallic window having at least one sash movable within a plane and a sill disposed transverse to said plane, said alarm device being secured to the remote side of said sill from said sash, by means extending through said sill, and said actuating element projecting through said sill for actuation by said sash when positioned in proximity to said sill.

Claim 10

An alarm system as defined in claim 2 in combination with a metallic window having at least two sashes movable within adjacent parallel planes and a sill disposed transverse to said planes; said alarm device being secured to the remote side of said sill from said sash, by means extending through said sill; each of said actuating elements projecting through said sill within one of said adjacent parallel planes for actuating by the corresponding sash when it is in proximity to said sill.

Claim 11

An alarm system as defined in claim 8, including further switching means within said housing serially connected with said source of electric power and said alarm means, and selectively operative through said sill to interconnect either of said normally closed electric contacts in said series circuit.