CLUTCH OPERATING DEVICE FOR BOTTOM ENLARGED EARTH DRILL

PROBLEM TO BE SOLVED: To provide a clutch operating device for a bottom enlarged earth drill capable of preventing damage, abnormal wear, or the like consequent to the operation of a clutch. SOLUTION: This clutch operating device for a bottom enlarged earth drill is provided with operating state det...

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Bibliographic Details
Main Authors KIUE AKIO, KAWARAI TAKESHI
Format Patent
LanguageEnglish
Published 06.02.2001
Edition7
Subjects
EARTH DRILLING
EARTH DRILLING, e.g. DEEP DRILLING
FIXED CONSTRUCTIONS
MINING
OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
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Summary:PROBLEM TO BE SOLVED: To provide a clutch operating device for a bottom enlarged earth drill capable of preventing damage, abnormal wear, or the like consequent to the operation of a clutch. SOLUTION: This clutch operating device for a bottom enlarged earth drill is provided with operating state detecting means such as sensors 29, 30 for detecting the most contracted and most extended positions of a clutch driving means such as a clutch cylinder 16, and driving control means such as solenoid selector valves 25, 26 permitting the actuation of a hydraulic motor 2a of a kelly driving device 2 only in the case of detecting the clutch driving means 16 being in a complete clutch 'on' position or a complete clutch 'off' position by the operating state detecting means 29, 30 of the clutch driving means 16.
Bibliography:Application Number: JP19990204201