Boots – shoes – and leggings
Patent
1982-03-22
1985-10-01
Krass, Errol A.
Boots, shoes, and leggings
254276, 364565, G01P 368
Patent
active
045450170
ABSTRACT:
A well drilling apparatus includes a monitoring system for monitoring the exact elevation of the traveling block. The monitoring system detects the elevation of the traveling block by means of periodically transmitted signals which are reflected back to the monitoring system by the traveling block. The apparatus further includes a control system preferably including an industrial control digital computer which is responsive to the elevation of the traveling block and controls the drawworks of the apparatus to prevent the traveling block from crashing into the crown block or working floor. In one embodiment of the apparatus the velocity of travel of the traveling block and the load being supported by the traveling block are also monitored in order to further restrict raising and lowering of the traveling block to be maintained within predetermined safe limits of operation.
REFERENCES:
patent: 2634405 (1953-04-01), Stone et al.
patent: 3101828 (1963-08-01), Wilson
patent: 3164661 (1965-01-01), Dellon
patent: 4187546 (1980-02-01), Heffernan et al.
patent: 4295201 (1981-10-01), Wiklund
patent: 4334217 (1982-06-01), Nield et al.
patent: 4368824 (1983-01-01), Thomasson
patent: 4403857 (1983-09-01), Holscher
Continental EMSCO Company
Cosimano Edward R.
Krass Errol A.
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