Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1993-03-01
1995-06-06
Will, Thomas B.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
33371, 33384, 33388, 33390, G01C 928
Patent
active
054210941
ABSTRACT:
An adjustable level having an angled base with legs extending normal to one another from a common edge and with magnets spaced along and extending fully through each leg; an L-shaped bracket having at least one bubble housing fixed to a leg thereof; a post extending from the base and through a hole in the bracket; a spring on the post and between a head on the post and the bracket to bias the bracket towards the base and to thereby engage ribs on the bracket into grooves on the base; and a retainer for retaining the level to objects, including a flexible cord connected to a return spring and a loop and hook to secure the cord in a pulled out condition surrounding an object.
REFERENCES:
patent: D317725 (1991-06-01), McCord
patent: 2277071 (1942-03-01), Cassell
patent: 2306373 (1942-12-01), Belden
patent: 2397550 (1946-04-01), Kroll
patent: 2452930 (1948-11-01), Ivey
patent: 2659975 (1953-11-01), Van Gundy
patent: 2757458 (1956-08-01), Zipser
patent: 3820249 (1974-06-01), Stone
patent: 4343093 (1982-08-01), Eadens
patent: 4970796 (1990-11-01), Masters et al.
patent: 4976040 (1990-12-01), Mish et al.
McCord David W.
Turner Steven A.
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