Geometrical instruments – Straight-line light ray type – Level
Patent
1994-07-05
1995-03-28
Fulton, Christopher
Geometrical instruments
Straight-line light ray type
Level
33299, 33705, G01C 100
Patent
active
054005159
ABSTRACT:
A measuring apparatus having a high water-proof property has water-proof rings rotatably disposed about outer peripheries of a horizontal shaft and a vertical shaft bearing. Gaps between the rings and the peripheries of corresponding openings in a housing are blocked by respective deformable elastic water-proof members which secure the rings to the housing.
REFERENCES:
patent: 2602229 (1952-07-01), Larsen et al.
patent: 3584889 (1971-06-01), Sheets
patent: 4281463 (1981-08-01), Kobayashi et al.
patent: 4805919 (1989-02-01), Wiblyi et al.
patent: 5056801 (1991-10-01), Beadle
patent: 5224762 (1993-07-01), Levenstein
Fulton Christopher
Nikon Corporation
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