Motion-sensitive alarm with line-cord-responsive automatic arming means

Claim 2

An alarm circuit for protecting an electrical device including a multi-electrode electronic switch having a first current flow path, a first power source connecTed to said first flow path, an alarm means in said first flow path of said multi-electrode switch, said electronic switch having a control electrode which normally prevents current flow from said first power source through said first flow path and said alarm means, a first motion-sensitive switch in series with said control electrode, with said first power source being connected to a second flow path including said motion-sensitive switch and said control electrode, a second switch in said first flow path between said first power source and said multi-electrode switch, a second power source removably coupled to said second switch, said second switch being open and said first current flow path being inoperative when said second power source is connected to said second switch, said second switch being closed and said first current flow path being closed when said second power source is disconnected from said second switch, flow of current from said first power source through said multielectrode switch and said alarm means being then controlled by the state of said motion-sensitive switch operating said control electrode and coupled with closure of said first switch permitting current flow through said first path and said alarm to operate said alarm.

Claim 3

An alarm circuit for protecting an electrical device including a multi-electrode electronic switch having a first current flow path through two of its electrodes, a first D.C. battery power source connected to said first flow path, an alarm means in said first flow path of said multi-electrode switch, said electronic switch having a control electrode which normally prevents current flow from said first power source through said first flow path and said alarm means, a first motion-sensitive switch in series with said control electrode, with said first battery power source being connected to a second flow path including said motion-sensitive switch and said control electrode, a second relay-controlled switch in said first flow path between said first battery power source and said multi-electrode switch, a second A.C. power source removably coupled to said second switch, said second switch being open and said first current flow path being inoperative when said second power source is connected to said second switch, said second switch being closed and said first current flow path being closed when said second power source is disconnected from said second switch, flow of current from said first power source through said multi-electrode switch and said alarm means being then controlled by the state of said motion-sensitive switch which operates said control electrode, closure of said first switch permitting current flow through said first path and operation of said alarm.

Claim 4

An alarm circuit for protecting an electrical device including a multi-electrode electronic switch having a first current flow path through two of its electrodes, a first D.C. battery power source connected to said first flow path, an alarm means in said first flow path of said multi-electrode switch, said electronic switch having a control electrode which normally prevents current flow from said first power source through said first flow path and said alarm means, a first motion-sensitive switch in series with said control electrode, with said first battery power source being connected to a second flow path including said motion-sensitive switch and said control electrode, a second relay-controlled switch in said first flow path between said first battery power source and said multi-electrode switch, a second A.C. power source removably coupled to said second switch, said second switch being open and said first current flow path being inoperative when said second power source is connected to said second switch, said second switch being closed and said first current flow path being closed when said second power source is disconnected from said second switch, flow of current from said first power source through said multi-electrode switch and said alarm means being then controlled by the state of said motion-sensitive switch which operates said control electrode, closure of said first switch permitting current flow through said first path and operation of said alarm.

Claim 5

The circuit defined in claim 2 wherein said first switch means closes when said electrical device is physically moved, and said electrical device includes a power cord for connection to said second power supply and said second switch closes when said power cord is disconnected from said power supply due to the operation of the relay, the operation of said first and second switches serving to directly connect said power source to said alarm to cause it to operate.

Claim 6

The circuit as defined in claim 2 wherein said electronic switch is a controlled rectifier having anode, cathode and control electrode, said anode and cathode being in said first current flow path.

Claim 7

The circuit defined in claim 1 and including an isolating power transformer connected between said second power source and said second switch, whereby said circuit is isolated from said second power source.

Claim 8

The apparatus defined in claim 1 wherein said motion-sensitive switch includes at least one curved, dish-shaped plate on which a conductive ball is seated.

Claim 9

The apparatus defined in claim 1 wherein said motion-sensitive switch includes upper and lower plates secured together but insulated from each other with one being concave and the other convex and with a conductive ball seated on the lower plate.