Anti-theft device for bicycles and the like

Claim 1

An alarm for bicycles and the like, comprising a. a housing mountable to said bicycle, said housing having a movable wall for access to said housing, b. an electric operated sound generator mounted to said housing, c. a first battery of relatively low voltage and a second battery of relatively high voltage connected in series to said generator, d. a key-operated lock switch connected in series to said batteries for selectively opening and closing a circuit to said batteries, e. at least a pair of independently adjustable mercury switches connected in parallel between said lock switch and said generator, f. at least one normally closed switch connected in parallel to said mercury switches and mounted in position within said housing adjacent said movable wall whereby said normally closed switch will be kept open as long as said wall is in the normal position, g. a relay connected between said sound generator and said mercury switches and said normally closed switch, h. said relay including a coil connected on one side to said first battery and on the other side to all of said mercury and normally closed switches and responsive to actuation of any one thereof, i. said relay also including first and second normally open switches, said first switch connected between said generator and said mercury and normally closed switches, said second switch being connected between said coil and said lock switch.