Level with top-reading magnification

Details Level with top-reading magnification Level with top-reading magnification

1991-06-14

1992-04-21

Haroian, Harry N.

Geometrical instruments

Indicator of direction of force traversing natural media

Level or plumb, terrestrial gravitation responsive

G01C 928

Patent

active

051055490

ABSTRACT:
A level is provided with a top-reading feature, allowing a vial to be viewed through the upper flange of the level. A magnifying element is disposed between the vial and an opening formed in the upper flange, to magnify the vial when it observed from the top of the level. The magnifying element is preferably formed integrally with a transparent lens, which is retained between a vial cover and a side of the web of the level frame. Complementary structure is provided on the lens on the opposite side of the web, for sealing the internal cavity defined by the vial covers, in combination with the lenses, to prevent entry of dirt or other foreign material into the cavity.

REFERENCES:
patent: 2750677 (1956-06-01), Wirth
patent: 3835549 (1974-09-01), De Jong
patent: 4011660 (1977-03-01), Johnson
patent: 4208803 (1980-06-01), Brown
patent: 4492038 (1985-01-01), Mayes
patent: 4765061 (1988-08-01), Rawlings et al.

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