Portable burglar alarm

Claim 2

A portable burglar alarm for detecting the unauthorized movement of a moveable surface, said burglar alarm comprising: a housing having substantial weight; a bell located within said housing; a spring driven motor located within said housing; a clapper connected to said spring driven motor for striking said bell when driven by said spring driven motor; a supporting leg connected to said housing; a moveable arm located within said supporting leg, one end of said moveable arm engaging said spring driven motor for preventing operation thereof when said moveable arm supports a substantial portion of the weight of said housing; and a spring means located between said one end of said moveable arm and said supporting leg and in contact with said moveable arm for disengaging said moveable arm from said spring driven motor for allowing operation thereof when said moveable arm is not supporting a substantial portion of the weight of said housing; said burglar alarm being positioned such that said housing contacts said moveable surface and the other end of said moveable arm rests upon a fixed surface, said bell being sounded when movement of said moveable surface relative to said fixed surface causes dislocation of said other end of said moveable arm such that said moveable arm no longer supports a substantial portion of the weight of said housing.

Claim 3

The burglar alarm according to claim 1 wherein said housing has an opening in proximity to the location of said bell.

Claim 4

The burglar alarm according to claim 2 further comprising a foot member connected to said other end of said moveable arm such that said foot member lies flat of said fixed surface when said housing is in contact with said moveable surface.

Claim 5

A portable burglar alarm for detecting the unauthorized movement of a moveable surface, said burglar alarm comprising: a substantially weighted enclosed housing, said housing having an upper and a lower portion; at least one bell located within said housing; a key wound spring driven motor located within said housing; a clapper connected to said spring driven motor for striking said at least one bell when driven by said spring driven motor; an elongated supporting leg connected to said lower portion of said housing; a moveable arm located within said supporting leg, one end of said moveable arm engaging said spring driven motor for preventing operation thereof when said moveable arm supports a substantial portion of the weight of said housing; a helical spring located between said one end of said moveable arm and said supporting leg for disengaging said moveable arm from said spring driven motor for allowing operation thereof when said moveable arm is not supporting a substantial portion of the weight of said housing; and means located within said supporting leg for restricting the travel distance of said moveable arm within said supporting leg; said burglar alarm being positioned such that said housing contacts said moveable surface and the other end of said moveable arm rests upon a fixed surface, said at least one bell being sounded when movement of said moveable surface relative to said fixed surface causes dislocation of said other end of said moveable arm such that said moveable arm no longer supports a substantial portion of the weight of said housing.

Claim 6

A portable burglar alarm for detecting the unauthorized movement of a moveable surface, said burglar alarm comprising: a substantially weighted enclosed housing, said housing having an upper and a lower portion; at least one bell located within said housing; a key wound spring driven motor located within said housing; a clapper connected to said spring driven motor for striking said at least one bell when driven by said spring driven motor; an elongated supporting leg connected to said lower portion of said housing; a moveable arm located within said supporting leg, one end of said moveable arm engaging said spring driven motor for preventing operation thereof when said moveable arm supports a substantial portion of the weight of said housing; a helical spring located between said one end of said moveable arm and said supporting leg for disengaging said moveable arm from said spring driven motor for allowing operation thereof when said moveable arm is not supporting a substantial portion of the weight of said housing; and means located within said supporting leg for restricting the travel distance of said moveable arm within said supporting leg; said burglar alarm being positioned such that said housing contacts said moveable surface and the other end of said moveable arm rests upon a fixed surface, said at least one bell being sounded when movement of said moveable surface relative to said fixed surface causes dislocation of said other end of said moveable arm such that said moveable arm no longer supports a substantial portion of the weight of said housing.

Claim 7

The burglar alarm according to claim 4 wherein first and second bells are located within said housing in proximity to said clapper.

Claim 8

The burGlar alarm according to claim 5 wherein said housing has first and second openings in proximity to said first and second bells respectively.

Claim 9

The burglar alarm according to claim 6 wherein the upper portion of said housing has a greater cross-sectional area in a horizontal plane than the lower portion of said housing in a corresponding parallel horizontal plane.

Claim 10

The burglar alarm according to claim 7 further comprising a foot member connected to said other end of said moveable arm such that said foot member lies flat on said fixed surface when said housing is in contact with said moveable surface.

Claim 11

The burglar alarm according to claim 8 wherein said moveable arm comprises an upper and a lower portion, the upper portion of said moveable arm having a smaller cross-sectional area than the lower portion of said moveable arm.