Geometrical instruments – Distance measuring – Sounding type
Patent
1989-03-09
1990-03-27
Yasich, Daniel M.
Geometrical instruments
Distance measuring
Sounding type
33715, 33720, 73321, 318482, 364567, G01B 310, G01F 2304
Patent
active
049108786
ABSTRACT:
Apparatus for indicating level of material comprises a cable vertically suspended so as to contact and be surrounded by the material. The cable is suspended from a cam follower mechanism that engages a cam coupled to a motor for selectively introducing slack in the cable, such that the upper portion of the cable unsupported by the material engages and is suspended from a load cell. Circuitry is responsive to cable weight measured by the load cell for indicating level of the material. The motor comprises a rotary electric motor having a horizontal axis of rotation perpendicular to the vertical cable. The cam comprises a cam plate coupled to the motor to rotate about the motor axis and having an asymmetric periphery surrounding the axis of rotation. The cam follower mechanism comprises an arm pivotally mounted in fixed position adjacent to the cam plate and supporting a roller that engages the cam plate periphery. The cable is suspended from the pivot-remote end of the arm, so that weight of the cable and the roller arm hold the roller in contact with the cam plate periphery. The level-indicating circuitry is microprocessor-based and includes facility for indicating level over a 4-20 ma current range, with automatic output correction for changeds in circuit characters.
REFERENCES:
patent: 3500546 (1970-03-01), Pilcher
patent: 3792331 (1974-02-01), Wissmiller et al.
patent: 4188726 (1980-02-01), Wemyss
patent: 4219133 (1980-08-01), Sinsky
patent: 4276774 (1981-07-01), McGookin
patent: 4483047 (1984-11-01), Linville, Jr.
patent: 4676099 (1987-06-01), McGookin
Fleckenstein Phillip P.
Knepler John T.
Regentin Randall J.
Berwind Corporation
Yasich Daniel M.
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