Apparatus for measuring a traction force by means of a traction dynamometer
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United States of America Patent
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Jul 10, 1990
Grant Date -
N/A
app pub date -
Nov 8, 1988
filing date -
Mar 18, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus for measuring a traction force which is measured during cable laying by means of a traction dynamometer (5) disposed between the cable (10) and a wire rope (11), the dynamometer including a strain gauge and a measuring circuit which amplifies the signals received from the strain gauge and converts them into frequency-modulated signals proportional to the traction force. These signals are fed to a measurement receiver (22) set up in the area of a winch (20), the wire rope (11) incorporating a first conductor to the measurement receiver (22) and the ground (24) incorporating another conductor. The output of the measuring circuit, which is connected to the conductor carried through the ground (24) has a measurement signal carrier frequency of 3 . . . 100 kHz and, with a capacitive coupling (C.sub.1, C.sub.2, C.sub.3) galvanically separated from the ground, transfers the signals through the ground to the measurement receiver (22). The capacitive coupling includes especially the cable pull (23) and a plate electrode (26).
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