Piston overtravel indicator

Details Piston overtravel indicator Piston overtravel indicator

1978-06-12

1980-06-10

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

92 5R, 33DIG15, 116272, 116280, 200 82D, 340 52C, 137806, G08B 2100, B60Q 126, H01H 3538

Patent

active

042075653

ABSTRACT:
An overtravel indicator for a piston received in a cylinder having an end wall toward which the piston moves includes an elongated indicator rod slidably mounted through a dielectric bushing in the end wall. A conductive garter spring is compressed between the indicator rod and a groove in the cylinder end wall. An electric circuit including an electrically operated indicator is connected for completion through the indicator rod, end wall and garter spring. In an inward armed position of the indicator rod, dielectric material carried by the rod is interposed between the rod and garter spring for opening the electric circuit. In an outward operated position of the rod, a conductive surface on the rod engages the garter spring to complete the circuit and operate the indicator.

REFERENCES:
patent: 3087038 (1963-04-01), Bethke
patent: 3947648 (1976-03-01), Muterel
patent: 3997887 (1976-12-01), Poynter

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