Geometrical instruments – Area integrators – Electrical
Patent
1980-09-18
1982-05-25
Haroian, Harry N.
Geometrical instruments
Area integrators
Electrical
G01B 312, G01B 504
Patent
active
043309410
ABSTRACT:
A measuring system and method is disclosed for accurately measuring the linear displacement of a longitudinal object having a straight longitudinal side, such as the displacement of a steel beam moving on a conveyor. The linear displacement of the object is measured by a metering device. The metering device includes a support frame, a plurality of spaced pulleys mounted on the frame, a continuous loop trained for travel around the pulleys with a portion of the path of travel of the loop extending parallel to the straight side of the object, and magnets or the like around the periphery of the loop to releasably attach the loop to the object. The measurement of the linear displacement of the object is provided by converting the movement of the loop to indicate the linear movement of the object. Preferably, two metering devices are positioned on either side of a limit switch. Each metering device is reciprocally movable so that as the object approaches the limit switch, the metering device on that side is moved to engage the object. When the object contacts the limit switch, the measurement of the linear displacement of the object is initiated using the metering device in contact with the object. When the object is opposite the other metering device, the other metering device is moved into contact with the object. By using two metering devices, the linear displacement of the object is continued after the object is no longer in contact with the first metering device.
REFERENCES:
patent: 1579260 (1926-04-01), Tiller
patent: 2077146 (1937-04-01), Hart
patent: 3050857 (1962-08-01), Pierce et al.
patent: 3688410 (1972-09-01), Zeidler et al.
patent: 3758954 (1973-09-01), Teplitz
patent: 4068384 (1978-01-01), Holy et al.
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