SAFETY APPARATUS FOR DRILLING RIG

In an apparatus for preventing the traveling block of a drilling rig from being drawn into the top of the rig and having a toggle valve engaging the cable on a cable drum to control the rig brake and rig clutch, a manual safety override which allows longer lengths of drill pipe, drill collars or oth...

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Bibliographische Detailangaben
1. Verfasser:	PAUL C. KOOMEY
Format:	Patent
Sprache:	eng
Schlagworte:	CAPSTANS EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS HAULING HOISTING HOISTS LIFTING MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS PERFORMING OPERATIONS TACKLES, e.g. PULLEY BLOCKS TRANSPORTING WINCHES
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Beschreibung
Zusammenfassung:	In an apparatus for preventing the traveling block of a drilling rig from being drawn into the top of the rig and having a toggle valve engaging the cable on a cable drum to control the rig brake and rig clutch, a manual safety override which allows longer lengths of drill pipe, drill collars or other special tools to be handled. A relay air valve normally allowing the passage of air to the toggle valve inlet for automatic operation but when actuated closing the air supply to the toggle valve and venting the air from the toggle inlet, and a manually actuated second air valve for actuating the relay valve with spring means normally holding the second valve in the closed position whereby the operator must constantly hold the second valve in order to override the toggle valve automatic control.