Crane with overload sensor

A crane overload sensor for use in a crane having a support member for maintaining said crane in a position relative to the earth and a deformable plate affixed about the upper portion of said support member, said crane of the type that applies a torque to said plate during the lifting of objects, said overload sensor comprising:

• a non-working-load-bearing bar fastened to said support member said support member extending through the generally central aperture of said deformable plate, said bar being affixed to the top portion of said support member;
• a switch fastened to said bar at a location distal from said support member;
• a movement sensor connected to said switch and responsive to the relative displacement of said deformable plate with respect to said support member during the lifting of objects by said crane, said switch being responsive to movements of said movement sensor said movement sensor being an actuator for said switch:
• and
• control means electrically connected to said switching means and to said crane such that said movement sensor delivers a stop/go signal to said crane.