Pulley system including emergency locking means for nuclear reac

Details Pulley system including emergency locking means for nuclear reac Pulley system including emergency locking means for nuclear reac

1977-03-25

1979-08-21

Engle, Samuel W.

G21C 1700

Patent

active

041652541

ABSTRACT:
A pulley system for use in driving the manipulating arm of a nuclear reactor vessel inspection device is disclosed. Two drive pulleys and pulley take-up spools are disposed in driving engagement with a motor. The pulley cable is looped about a first set of idler pulleys fixed to the manipulator arm which is to be driven along the main or central column of the inspection device. Two additional idler pulleys, a second set, are used to define another portion of the pulley cable loop, which portion serves to equalize unbalanced forces in the cable.
When the drive motor is actuated, only that portion of the pulley cable between the drive set and the first set of idler pulleys moves. Depending on the direction of movement, the manipulator arm is raised or lowered with equal force on each side thereof minimizing wear and potential hazards. In addition, to guard against the possible dangers resulting from a snapped pulley cable, a restraining clip is secured to the cable between the second set of idler pulleys and is appropriately sized to jam between one of the idler pulleys and its support bracket.

REFERENCES:
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patent: 1437685 (1922-12-01), Scharpenberg et al.
patent: 1507712 (1924-09-01), Proudfoot
patent: 1765347 (1930-06-01), Shepard
patent: 2866621 (1958-12-01), McIntyre
patent: 3584504 (1971-06-01), Proctor et al.
patent: 3672471 (1972-06-01), Badding
patent: 3809607 (1974-05-01), Murray et al.
patent: 3936034 (1976-02-01), Larrade
"Materials Evaluation," Jul. 1970, vol. 28, (No. 7), pp. 162-166.

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