Patent ID: 8695432

Claim:
A screw with a stress sensing device, the screw comprising: a screw main body having: a screw head disposed at one end of the screw main body; a screw body connecting with the screw head; and a hollow threaded hole along an axle center of the screw main body; a coaxial member engaged with and screwed in the hollow threaded hole, wherein the coaxial member is coaxial with the screw main body, the coaxial member comprising: an elongated body; and two threaded parts disposed on both ends of the elongated body engaged with and screwed in the hollow threaded hole for withstanding a stress applied on the screw main body, wherein one of the two threaded parts has a groove, each of the two threaded parts has an inner edge disposed at one end thereof, each of the two threaded parts has an outer edge disposed at the other end thereof, both of the inner edges are connected with the elongated body, the inner edge of the threaded part with the groove is aligned with a bottom end of the screw head, and the outer edge of the threaded part with no groove is aligned with a bottom end of the screw body; and a stress sensing member disposed on the elongated body, transmitting a stress signal by a wire passing through the groove.