Strain detection apparatus and method for radiological equipment

Communications: electrical – Systems – Call station

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250446, 340272, G08B 2100

Patent

active

040645002

ABSTRACT:
Apparatus and method are disclosed for detecting excess strain or failure in a main cable interconnecting a movable tower and counterweight assembly in a tiltable X-ray table. A secondary cable, substantially parallel to the main cable, is provided for supplementing the force exerted by the main cable structure between the tower and counterweight to a degree which is a function of the amount of strain occurring in the main cable. Changes in the amount of supplemental force provided by the secondary cable are sensed and used to produce an indication of the main cable strain. A supplemental force indication is accomplished by structure for holding a portion of the secondary cable in a transversely deflected position and by a spring actuated limit switch coupled to the deflected portion. The limit switch produces an indication in response to forces transverse to the length of the secondary cable exerted in the deflected portion, which forces result from increased tension on the secondary cable. The strain indication constitutes an audible signal produced by an audible signal generator in response to actuation of the limit switch.
The X-ray table has a top pivotable through the horizontal, and circuitry and apparatus for preventing further pivoting of the table top when the top has been moved to its horizontal position following the production of a strain indication.

REFERENCES:
patent: 2845503 (1958-07-01), Durand
patent: 3265220 (1966-08-01), Knight
patent: 3802379 (1974-04-01), Sandberg
patent: 3916203 (1975-10-01), Norgren
patent: 3918301 (1975-11-01), Baer

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