Alarm system for bicycles and the like

Claim 1

An alarm system for bicycles and the like having a chassis and handlebars mounted on a rotatable post, comprising: a collar having an undulating exterior surface and including means for being mounted on the handlebar post to rotate therewith, a pin member carrying a first electrical contact means, means for mounting said pin member on said chassis with said pin member longitudinally directed toward said collar, spring means urging said pin member toward an inward position seated against the undulating collar surface, whereby said pin is moved to an outward position by the undulating collar surface in response to rotation of the handlebar post, an electrically operated alarm, an energizing circuit for said alarm, said circuit comprising means for receiving a source of electrical power, a second electrical contact means positioned to be contacted by the first electrical contact means in response to outward movement of the pin member when the handlebar post is rotated, and circuit means connected to complete an energization circuit for the alarm in response to contact being made between the first and second electrical contact means, and a third electrical contact means held opposed to and electrically connected to the second electrical contact means on the collar side of the first electrical contact means, said third contact means positioned to be contacted by the first contact means moving inwardly under the influence of the spring means in response to removal of the collar, and thereby complete the alarm energizing circuit when the collar is removed.