Cable-controlled electrical safety switch device

Details Cable-controlled electrical safety switch device Cable-controlled electrical safety switch device

1989-03-20

1991-03-26

Scott, J. R.

Electricity: circuit makers and breakers

Special application

200543, H01H 302, H01H 1702, F16P 300, G05G 102

Patent

active

050031350

ABSTRACT:
A cable-controlled electrical safety switch device comprises a piston 15 tensioning a cable 2 under the action of a spring 23 via a rod 10 and a screw thread 12a for adjusting the tension of the spring and of the cable. A piston groove 25 actuates a push member 28 for the switch 40. The piston is angularly adjustable. The flank 32 of the groove remote from the spring is helicoidal. When the cable is long, a higher tension is selected so that the groove flank 31 moves away from the push member 28. This distancing is desirable in order that any length variations due to heat--which are greater with a long cable--may be prevented from triggering the switch. The clearance between the other flank 32 and the push member 28 is then corrected by rotation of the piston.

REFERENCES:
patent: 3169619 (1965-02-01), Alexander, Jr. et al.
patent: 4112265 (1978-09-01), Crepeau et al.
patent: 4458122 (1984-07-01), Knight

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