Automatic self-leveling instrument mount

Geometrical instruments – Straight-line light ray type – Level

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Details

33366, 33402, 73483, 73505, G01C 502

Patent

active

042650275

ABSTRACT:
A self-leveling instrument mount comprises an instrument table pivotally mounted above a stationary frame on first, second and third vertical support arms. The first support arm is a fixed length member connected to the frame through a ball and socket joint. The second and third support arms are formed of screws extending between the table and frame having effective lengths that are controlled, respectively, by first and second servo motors in response to a pendulum switch to maintain the table parallel to a horizontal reference plane. The pendulum is magnetically damped during operation of the servo motors for stabilization. A mercury switch on the table disables the servo motors when the tilt of the table is too large to be leveled by the support screws.

REFERENCES:
patent: 2803887 (1957-08-01), Fry, Jr.
patent: 2947175 (1960-08-01), King et al.
patent: 3537307 (1970-11-01), Pliha
patent: 3962693 (1976-06-01), Schamblin
patent: 3983636 (1976-10-01), Fashbaugh et al.
patent: 3985033 (1976-10-01), Ford
patent: 4035084 (1977-07-01), Ramsay

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