Electricity: circuit makers and breakers – Fluid pressure – Flow-responsive type
Patent
1991-10-21
1993-08-17
Scott, J. R.
Electricity: circuit makers and breakers
Fluid pressure
Flow-responsive type
200 6169, 200334, 175 2, 175 456, H01H 3538, E21B 43116, F42C 1500
Patent
active
052371360
ABSTRACT:
In accordance with illustrative embodiments of the present invention, a safety bypass switch for use with explosive well tools includes a hollow conductive body having a copper conductor rod extending axially therethrough, a spring-loaded contact element movable transversely in the body between a first position where a surface of the element engages the rod to provide a solid short between the rod and the body, and a second position where such surface is out of engagement with the rod, and a diaphragm or piston for operating the contact element in a manner such that a predetermined hydrostatic pressure in the well bore will shift the contact element to the second position. The springs which bias the element toward the first position are mounted internally and externally of the body. In another embodiment of the invention a manually operated grounding switch is used in combination with the hydrostatic pressure operated switch to provide redundant assurance against accidental firing.
REFERENCES:
patent: 3758731 (1973-09-01), Vann et al.
patent: 4266613 (1981-05-01), Boop
patent: 4306628 (1981-12-01), Adams, Jr. et al.
patent: 4967048 (1990-10-01), Langston
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