Boots – shoes – and leggings
Patent
1981-04-21
1984-05-15
Wise, Edward J.
Boots, shoes, and leggings
364565, 33 1PT, 250231SE, G06F 1520, G01B 730
Patent
active
044491913
ABSTRACT:
The angle which two members enclose with respect to an axis of rotation about which they are rotatable with respect to each other is measured by placing a rotating mark carrier on one of two members. The carrier has marks disposed thereon at a certain distance apart in the direction of rotation. A first sensor is attached to the same member as the mark carrier and a second sensor is attached to the other member. The sensors emit a signal corresponding to each of the passing marks, which signal is fed to a measuring and evaluating circuit. The circuit has an identification circuit which identifies the marks belonging to the signals emitted by the sensors, a time measuring unit which measures the time distances of the signals emitted by the sensors and a calculation and storage circuit which, after receiving a corresponding command signal, calculates and stores the angular distances, with respect to a zero point of the angular measurements. The measurement is taken between the marks from the time distance values for signals assigned to identified marks and coming from the various sensors; from stored calibrating values for the absolute angular distances of identified marks; and from the instantaneous angular velocity of the mark carrier; said calculation and storage circuit, upon subsequent rotations of the mark carrier, calculates the instantaneous angle between the two members from the time distance values for signals assigned to identified marks and coming from the various sensors, and from the stored angular distances of these marks, the angular distances being with respect to the zero point of the angular measurement, and from the instantaneous angular velocity of the mark carrier.
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