CLUTCH OPERATING DEVICE FOR BOTTOM ENLARGED EARTH DRILL

• Main Authors: KIUE AKIO, KAWARAI TAKESHI
• Format: Patent
• Language: English
• Published: 06.02.2001
• Edition: 7
• 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

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.