Grade checking tool

Details Grade checking tool Grade checking tool

1976-06-03

1978-01-10

Phillips, Charles E.

Geometrical instruments

Indicator of direction of force traversing natural media

Level or plumb, terrestrial gravitation responsive

G01C 900

Patent

active

040671178

ABSTRACT:
A spirit level having a measuring stick slidably mounted on one end of the level with means attached to the level for clamping and releasing the free transverse movement of said measuring stick from a position near the center of the level. A separate bracket is provided for attachment to the level for the clamping means which bracket also may include guide means for the measuring stick. The clamping means comprises a spring urged frictional brake which engages the measuring stick and is releasable by a thumb operated handle slidably mounted adjacent the vial which indicates when the level is level. This guiding bracket may be longitudinally extended with respect to the level to increase the length thereof.

REFERENCES:
patent: 1329196 (1920-01-01), Matoba
patent: 2520700 (1950-08-01), Throndike
patent: 2746164 (1956-05-01), Eitzen
patent: 3286356 (1966-11-01), Johnson
patent: 3328887 (1967-07-01), Wright

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