Limit switch having means to evaluate its actuating stroke

Details Limit switch having means to evaluate its actuating stroke Limit switch having means to evaluate its actuating stroke

1989-03-20

1990-07-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

200 47, G01D 534

Patent

active

049437151

ABSTRACT:
A limit switch having a fixed casing, an actuating part moveably support by the casing, and a pair of contact sets which are adapted to be activated by the movement of the actuating part, one for producing a normal switch output and the other for producing a stroke signal which serves as data for evaluating the appropriateness of the stroke of the actuating part. The other contact set may produce a signal when the actuating part has moved a certain distance more than the minimum stroke for activating the first contact set. Thus, the output from the second contact set ensures a certain stroke margin of the actuating part. Further, the second contact set may produce another stroke signal when the actuating part has been displaced close to the maximum permissible stroke of the actuating part so that an excessive stroke of the actuating part may be detected. The contact set may be purely mechanical or may also be a combination of a mechanical switch and a photoelectric switch.

REFERENCES:
patent: 4556768 (1985-12-01), Atsumi et al.
patent: 4864124 (1989-09-01), Mirabella et al.

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