Tribrach device

Details Tribrach device Tribrach device

1994-07-22

1996-03-26

Will, Thomas B.

Geometrical instruments

Straight-line light ray type

Level

33277, 33227, 33299, 33DIG21, G01C 500, G01C 1500

Patent

active

055010180

ABSTRACT:
An improved tribrach device for attaching an optical sighting instrument to a support such as a tripod. The tribrach device includes a pivotable locking ring for securing the legs of the sighting instrument to the tribrach. The locking ring is biased towards its locked position and is easily unlocked when desired. A laser beam is projected upwardly and downwardly along a vertical axis.

REFERENCES:
patent: 2775423 (1956-12-01), Strass
patent: 2922225 (1960-01-01), Fatkin et al.
patent: 3471234 (1969-10-01), Studebaker
patent: 3931947 (1976-01-01), Tagnon
patent: 4309010 (1982-01-01), Posso
patent: 4832296 (1989-05-01), Schnepp
patent: 5159760 (1992-11-01), Spiegel

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