Position indicator

Solid material comminution or disintegration – Apparatus – With automatic control

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Details

241207, 324 61R, B02C 2500

Patent

active

042510350

ABSTRACT:
A position indicator for monitoring movement of one part of an assembly relative to another--e.g., for monitoring the relative positions of the movable and fixed jaws of a gyratory crusher. The position indicator has a body which is fixed to a probe suitable support and a variable capacitor which responds to movement of the member to be monitored to adopt a capacitance value which is characteristic of each position of that member relative to the support. The capacitor is connected into an electrical circuit operative to generate a signal which varies according to the capacitance value and therefore provides an indication of the position of the member being monitored. The probe body includes at least two telescopic tubes arranged so that the body extends and contracts in accordance with movement of the member being monitored and conductive parts of the variable capacitor are connected to the tubes, so that their relative positions change with extension and contraction of the probe body. Hydraulic fluid is provided between the conductive parts to act as a dielectric. Thus, the capacitance value varies according to the relative positions of the two tubes.

REFERENCES:
patent: 3133706 (1964-05-01), Mertz
patent: 3566222 (1971-02-01), Wolfendale
patent: 3928796 (1975-12-01), Kaiser

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