Safety stress shutdown switch

Details Safety stress shutdown switch Safety stress shutdown switch

1979-10-01

1982-10-19

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

7380264, 200249, 340665, G08B 2100

Patent

active

043553079

ABSTRACT:
A method and apparatus for measuring a predetermined limit of deflection or stress of a load bearing means or beam such as a walking beam of an oil well pumping unit uses a spaced fixed arm mounted on said beam at one end and having a first sensor means attached near the other end with a second sensor mounted on said beam so that said beam deflects to produce a signal which can be used to sound an alarm or operate control means to relieve stress of said beam.

REFERENCES:
patent: 1624476 (1927-04-01), Cummings
patent: 3411348 (1968-11-01), Schultheis, Jr.
patent: 3952879 (1976-04-01), Grove
patent: 3992933 (1976-11-01), Randolph, Jr.

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