DRILLING DEVICE

PROBLEM TO BE SOLVED: To provide a drilling device capable of drilling with low torque and improving replacement operability for a drill bit.SOLUTION: A reverse gear device 9 can rotate a second drill bit 8 reversely to a rotating direction of a first bit drill 6, so the second drill bit 8 can cance...

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Hauptverfasser:	KAWAMURA YOHEI, MIYAJI TOSHIYUKI, MURAKAMI KAZUTOSHI
Format:	Patent
Sprache:	eng
Schlagworte:	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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creator	KAWAMURA YOHEI MIYAJI TOSHIYUKI MURAKAMI KAZUTOSHI
description	PROBLEM TO BE SOLVED: To provide a drilling device capable of drilling with low torque and improving replacement operability for a drill bit.SOLUTION: A reverse gear device 9 can rotate a second drill bit 8 reversely to a rotating direction of a first bit drill 6, so the second drill bit 8 can cancel rotational reaction force generated by the first drill bit 6 to suppress the rotational reaction force. The reverse gear device 9 is installed in a cylindrical body 2, so the first drill bit 6 and second drill bit 8 can have sizes, shapes, etc., set without being restricted by the size of the reverse gear device 9. Consequently, the first drill bit 6 and second drill bit 8 are reducible in drilling resistance to drill with low torque. Further, the first drill bit 6 and second drill bit 8 having worn due to drilling can be replaced with new ones irrelevantly to the reverse gear device 9, so the first drill bit 6 and second drill bit 8 are improved in replacement operability.
format	Patent
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The reverse gear device 9 is installed in a cylindrical body 2, so the first drill bit 6 and second drill bit 8 can have sizes, shapes, etc., set without being restricted by the size of the reverse gear device 9. Consequently, the first drill bit 6 and second drill bit 8 are reducible in drilling resistance to drill with low torque. 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The reverse gear device 9 is installed in a cylindrical body 2, so the first drill bit 6 and second drill bit 8 can have sizes, shapes, etc., set without being restricted by the size of the reverse gear device 9. Consequently, the first drill bit 6 and second drill bit 8 are reducible in drilling resistance to drill with low torque. 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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
title	DRILLING DEVICE
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