Angular displacement measuring apparatus

Details Angular displacement measuring apparatus Angular displacement measuring apparatus

1989-02-23

1990-07-10

Green, Randall L.

Surgery

Truss

Pad

33512, 33534, A61B 510

Patent

active

049400630

ABSTRACT:
Angular displacement measuring apparatus includes a tightly-wound coil spring conduit which, when bent, elongates on the outside of the bend without substantially shortening on the inside of the bend. A wire is disposed within the conduit to extend from one end, where the wire is fixed so that it cannot slide longitudinally relative to the conduit, to the other end, where the wire is free to slide longitudinally relative to the conduit. A movement measuring device is mounted on the other end of the conduit and coupled to the wire for measuring movement of the wire. As the conduit is bent, the wire is caused to move an amount proportional to the degree of the bend and so measurement of the movement of the wire serves as a measure of the degree of the bend, i.e., angle of displacement of the conduit. Bending in an object is determined by attaching the conduit to the object to be measured.

REFERENCES:
patent: 3608541 (1971-09-01), Hall
patent: 3991745 (1976-11-01), Yoslow et al.
patent: 4643194 (1987-02-01), Fogarty

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