Mineral oils: processes and products – By treatment of solid mineral – e.g. – coal liquefaction – etc. – Specified procedure to improve separation of solids from...
Patent
1983-05-06
1985-04-02
Schultz, William H.
Mineral oils: processes and products
By treatment of solid mineral, e.g., coal liquefaction, etc.
Specified procedure to improve separation of solids from...
248455, 248479, 292306, A47F 512
Patent
active
045083053
ABSTRACT:
A locking device for infinitely varying the inclination of a drawing board mounted about a hinge axis along one edge of a base or table structure between a maximum tilt angle and a minimum angle such as horizontal in which a rod is pivotally connected at one end to a drawing board and extends downwardly alongside the base structure, a lock member is pivotally mounted on the base structure and has a plate portion having a hole therein to receive said rod, said hole having a configuration providing frictional contact with said rod surface in relative angular positions of the rod as determined by the inclination of the drawing board and by the pivotal movement of the lock member, the configuration of the hole maximizing such frictional contact, and a magnet on the base structure cooperable with said lock member to hold the lock member in release position with respect to the rod, the lock member being automatically disengaged from said magnet in one position of the drawing board.
REFERENCES:
patent: 2159474 (1939-05-01), Drucks
patent: 2702205 (1955-02-01), Germain
patent: 2833081 (1958-05-01), Pottern
patent: 3298646 (1967-01-01), van Buren
patent: 3441303 (1969-04-01), Tabor
patent: 4215885 (1980-08-01), McCray
patent: 4314407 (1982-02-01), Kawahara
Avella Frank S.
Johnson Sigurd A.
Jones Robert I.
Plan Hold Corporation
Ramirez Ramon O.
Schultz William H.
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