Self balancing electric hoist

Details Self balancing electric hoist Self balancing electric hoist

1983-12-20

1987-04-21

Spar, Robert J.

Traversing hoists

With haul-in line

318628, B66C 1312

Patent

active

046589716

ABSTRACT:
A self-balancing screw jack that is responsive to small manually applied "upset" loads to move the load in the desired direction. A strain gauge measure the total load and is used to establish a null signal representative of the load at rest. This nulled signal is then continuously compared with the actual load signal. When the actual load signal varies from the preset nulled signal by a predetermined value, the drive motor is actuated to drive the load in the direction of the variance. A non-reversible screw jack is used to support the load in the at rest position.

REFERENCES:
patent: 3254289 (1966-05-01), Hartman
patent: 3866048 (1975-02-01), Gieschen et al.
patent: 3916279 (1975-10-01), Kawano et al.
patent: 4107590 (1978-08-01), Pury et al.
patent: 4283764 (1981-08-01), Crum et al.
patent: 4313165 (1982-01-01), Clelford et al.
patent: 4541029 (1985-09-01), Ohyama

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