CLUTCH DEVICE FOR EARTH THRILL

PROBLEM TO BE SOLVED: To provide a clutch device for an earth drill which is never driven from a released state to an engaging side even if a reel table is carelessly rotated, and dispenses with a positioning work for releasing the clutch. SOLUTION: A clutch member 25 is insertedly provided between...

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Bibliographic Details
Main Author KIUE AKIO
Format Patent
LanguageEnglish
Published 21.09.1999
Edition6
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 device for an earth drill which is never driven from a released state to an engaging side even if a reel table is carelessly rotated, and dispenses with a positioning work for releasing the clutch. SOLUTION: A clutch member 25 is insertedly provided between a first and a second rotary members 8, 3b provided so as to rotate unitedly with a kelly-bar of an earth drill. The clutch member 25 is moved to transmit the rotation of the first rotary member 8 to the second rotary member or to release them. A clutch device has an energizing means such as a spring 27 to energize the clutch member 25 toward a transmission side and moreover a clutch driving means such as a hydraulic cylinder 34 and a rod 28 which drive the clutch member 25 to a clutch release position against the energizing means. The shape of the clutch member 25 in a contact part 30 with the clutch driving means is composed in an annular shape centering around the kelly-bar 1.
Bibliography:Application Number: JP19980062368