Proportional controller
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United States of America Patent
Stats
-
Mar 17, 1981
Grant Date -
N/A
app pub date -
Jun 15, 1978
filing date -
Jun 15, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a railroad spike driving machine, the spike driving mechanism is centered over a spike by a system which provides simultaneous proportional control over both the vertical and horizontal positions of the spike driver. The driver is mounted on a carriage whose position is adjustable according to signals derived from the deflection of a control arm. Strain gauges mounted on the control arm sense the push or pull of the operator to adjust the carriage position. The speed of the drive stroke of the hydraulic spike driver is governed by a proportional control valve which is in turn controlled by a signal generated from a trigger switch on the control arm.
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