Plumb device to determine verticals and horizontals

Details Plumb device to determine verticals and horizontals Plumb device to determine verticals and horizontals

1991-10-15

1993-05-25

Haroian, Harry N.

Geometrical instruments

Straight-line light ray type

Alignment device

33291, 33227, G01C 1502

Patent

active

052128890

ABSTRACT:
A plumb device includes a direction determination unit suspended on an upper, movable, convexed portion of a universal joint. A lower, fixed, concaved portion of the movable joint is rigidly connected to a stand by means of a housing. The lower joint part has a lubricant supply line through which a lubricant can be introduced to a groove located on the upper joint part and positioned so as to be between the upper and lower joint parts.

REFERENCES:
patent: 2521731 (1950-09-01), Kennedy
patent: 2554133 (1951-05-01), Von Arx
patent: 3141242 (1964-07-01), Heath
patent: 3525448 (1970-08-01), Bauer
patent: 3711171 (1973-01-01), Orkin et al.
patent: 3911588 (1975-10-01), Ohneda
patent: 4993161 (1991-02-01), Borkovitz
patent: 5012585 (1991-05-01), Di Maggio
patent: 5054940 (1991-10-01), Momose et al.

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