Theatrical stage

Details Theatrical stage Theatrical stage

1985-09-23

1987-01-27

Murtagh, John E.

Static structures (e.g., buildings)

Lazy tong extension unit

52 7, 254122, 254126, 108145, 108147, 248157, E04H 1218

Patent

active

046386106

ABSTRACT:
A theatrical stage, comprising a plurality of side-by-side, screw-operated shearlegs tables, each such table having its own operating mechanism connected to the operating vertical screw. The screw is pivotally connected to the shearlegs members by dual transmission members, by which movement of the table platform is made almost linear in relation to the rotation of the screw. The vertical movement of the platform of the shearlegs tables is synchronized by employing as operating mechanism, electro-hydraulic step motors for each table, with a brake mounted on each screw for arresting rotary motion of the step motor.

REFERENCES:
patent: 2747692 (1956-05-01), Holmes
patent: 2829928 (1958-04-01), Callaway
patent: 2993675 (1961-07-01), Tatter
patent: 3034765 (1962-05-01), Ludowici
patent: 3404494 (1968-10-01), Wolfe
patent: 3700070 (1972-10-01), King
patent: 3812631 (1974-05-01), Cruse
patent: 3982718 (1976-09-01), Folkenroth
patent: 4041799 (1977-08-01), Teti
patent: 4232901 (1980-11-01), Harrington

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