Level indication device and method for providing a level indicat

Details Level indication device and method for providing a level indicat Level indication device and method for providing a level indicat

1987-05-22

1988-05-24

Martin, Jr., William D.

Geometrical instruments

Indicator of direction of force traversing natural media

With viewing aid

33370, 33377, 33390, G01C 936

Patent

active

047456876

ABSTRACT:
A level indicating device used to indicate proper orientation of a recreation vehicle (RV) such as a motor home, trailer, or camper. The device comprises of a generally transparent dome fixedly mounted on a base which can be removeably attached to a generally flat, horizontal surface which is preferably the ceiling of the RV. The dome is approximately half-filled with a liquid which is resistant to freezing, and carries a plurality of parallel lines graduated to indicate when the orientation of the base with respect to horizontal is within a three degree tolerance. In operation, the surface of the liquid lies generally between the plurality of parallel lines when the flat surface to which the base is attached is within three degrees of tolerance with respect to horizontal. The dome is illuminated by a conventional pen light removeably inserted into apertures in the base, the light being activated by pressing on one end of the light.

REFERENCES:
patent: 1260565 (1918-03-01), Marshall
patent: 1267049 (1918-05-01), Boos
patent: 1274333 (1918-07-01), Roland
patent: 1291230 (1919-01-01), Stitzel
patent: 1820791 (1931-08-01), Forrest
patent: 1948612 (1934-02-01), Bouchard
patent: 2205733 (1940-06-01), Sauter et al.
patent: 2605553 (1952-08-01), Kunkel
patent: 3146529 (1964-09-01), Chamberlin
patent: 3422544 (1969-01-01), Wyse
patent: 3766657 (1973-10-01), Hopkins
patent: 3916531 (1975-11-01), Morton
patent: 4085515 (1978-04-01), Darden

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