Electro-mechanical displacement measuring device

Geometrical instruments – Area integrators – Electrical

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Details

33143L, 172430, 214 1MD, G01B 702

Patent

active

042863864

ABSTRACT:
A displacement measuring device is disclosed that is particularly useful for measuring and remotely indicating the displacement of a piston rod relative to the cylinder of a power actuator of an earth working implement. The device includes a variable resistor controlled by a gearless actuator connected with the piston rod so that the effective resistance of the resistor is varied depending upon the axial displacement of the piston rod relative to the cylinder. An indicator is connected by electrical circuitry with the variable resistor to display the amount of piston rod displacement relative to the cylinder. A plurality of embodiments of the device are disclosed with one disclosed embodiment including a cable wound about a pulley mounted on the rotatable control shaft of the variable resistor with the cable having one end fastened to the piston rod and a retraction spring to maintain the cable taut regardless of piston displacement in either axial direction. The other disclosed embodiments include a linear resistant element mounted on either the cylinder or the piston rod with a wiper arm engaging the resistance element so that the effective resistance is varied depending upon the amount of piston rod displacement relative to the cylinder and a cylinder mounted pivotable first rod pivoted by a second rod mounted on the piston rod so that pivoting of the first rod in one direction causes a finger to be pivoted to rotate the control shaft of a variable resistor to thus vary the effective resistance of the resistor.

REFERENCES:
patent: 2589896 (1952-03-01), Toland
patent: 2772411 (1956-11-01), Cooper
patent: 2851014 (1958-09-01), Healy
patent: 2934938 (1960-05-01), Rhoades
patent: 3160836 (1964-12-01), Farley
patent: 3271564 (1966-09-01), Rosenfeld et al.
patent: 3500547 (1970-03-01), Van Haagen
patent: 3553842 (1971-01-01), Gerber et al.
patent: 4071957 (1978-02-01), Sumption et al.
patent: 4205453 (1980-06-01), Steele

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