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Document Type and Number:
Japanese Patent JPH0477115
Kind Code:
B2
Abstract:
PURPOSE:To reduce the size of a well sinking machine by stretching a chain for moving a drill rod up and down across a guide frame and a drive unit therefor and a rotary unit for rod thereby enabling drilling and intermittent dropping through lever action. CONSTITUTION:Sprockets 31 are supported at the upper and lower ends of a guide frame 1 and a chain is entrained thereabout. The chain is driven through by a motor 27 the sprockets having teeth around the entire circumference and a percussion sprocket having teeth in approximately half of the outer circumference, and switching is made through a lever 33. The guide frame is coupled/ uncoupled with/from a drill rod through a slide plate 7. Furthermore, a rotary table 17 for the drill rod 14 is arranged. By such arrangement, percussion drill and rotary drill can be performed and no winch is required, resulting in reduction of the size of well sinking machine.

Inventors:
EGUCHI TAKUMI
UMEMOTO YASUHIRO
Application Number:
JP10545688A
Publication Date:
December 07, 1992
Filing Date:
April 30, 1988
Export Citation:
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Assignee:
KOKEN KOGYO KK
International Classes:
E03B3/10; E21B1/02; E21B3/02; E21B6/06



 
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