Internally dampened percussion rock drill

Details Internally dampened percussion rock drill Internally dampened percussion rock drill

2010-01-19

2011-10-04

Gay, Jennifer H (Department: 3676)

Boring or penetrating the earth

Bit or bit element

Core forming type

C173S010000, C173S135000, C173S206000

Reexamination Certificate

active

08028772

ABSTRACT:
A percussion drill, and methods of using the same, including a shank in mechanical alignment with a piston-hammer and a valve in fluid communication with the piston-hammer. The percussion drill further includes an internal hydraulic dampening system for reducing the velocity of the piston-hammer when the shank is forward of a power position relative to the velocity of the piston-hammer when the shank is in a power position. Preferably, the internal hydraulic dampening system includes mechanical alignment of a portion of the piston-hammer with a port in fluid communication with the valve, operable to reduce fluid flow into an area surrounding the valve when the piston-hammer is forward of its position relative to its normal operation.

REFERENCES:
patent: 2365749 (1944-12-01), Curtis
patent: 2394194 (1946-02-01), McCarthy
patent: 2814462 (1957-11-01), De Jarnett
patent: 3107738 (1963-10-01), Osborn
patent: 3205951 (1965-09-01), Pyles
patent: 3500941 (1970-03-01), Rudman
patent: 3508619 (1970-04-01), Huffman
patent: 3692124 (1972-09-01), Kimber et al.
patent: 3768576 (1973-10-01), Martini
patent: 3896889 (1975-07-01), Bouyoucos
patent: 3903972 (1975-09-01), Bouyoucos et al.
patent: 3917005 (1975-11-01), Cannon et al.
patent: 4006783 (1977-02-01), Granholm et al.
patent: 4022108 (1977-05-01), Juvonen et al.
patent: 4044844 (1977-08-01), Harris et al.
patent: 4069877 (1978-01-01), Durand
patent: 4084486 (1978-04-01), Juvonen et al.
patent: 4150603 (1979-04-01), Etherington et al.
patent: 4207805 (1980-06-01), Jonsson et al.
patent: 4474248 (1984-10-01), Musso et al.
patent: 4478291 (1984-10-01), Futros et al.
patent: 4563938 (1986-01-01), Henriksson
patent: 4646854 (1987-03-01), Arndt et al.
patent: 4660658 (1987-04-01), Gustafsson et al.
patent: 4784228 (1988-11-01), Ito
patent: 4828048 (1989-05-01), Mayer et al.
patent: 5014796 (1991-05-01), Gustafsson et al.
patent: 5050688 (1991-09-01), Patterson
patent: 5107944 (1992-04-01), Gustafsson et al.
patent: 5134989 (1992-08-01), Akahane
patent: 5396965 (1995-03-01), Hall et al.
patent: 5445232 (1995-08-01), Brannstrom
patent: 5680904 (1997-10-01), Patterson
patent: 5715897 (1998-02-01), Gustafsson et al.
patent: 5944117 (1999-08-01), Burkholder et al.
patent: 6047778 (2000-04-01), Coffman et al.
patent: 6516902 (2003-02-01), Klemm
patent: 7681664 (2010-03-01), Patterson et al.
patent: 2001/0013428 (2001-08-01), Brady
patent: 2004/0094028 (2004-05-01), Sheard
patent: 2005/0023014 (2005-02-01), Bermingham
patent: 2006/0175091 (2006-08-01), Koskimaki et al.
patent: 2007/0246236 (2007-10-01), Keskiniva et al.
patent: 2007/0267223 (2007-11-01), Andersson et al.
patent: 2008/0000692 (2008-01-01), Roussy
patent: 2006512217 (2006-04-01), None
patent: WO-92/01138 (1992-01-01), None
Written Opinion mailed Sep. 25, 2009 in corresponding Application No. PCT/US2009/036312.
International Search Report mailed Sep. 25, 2009 in corresponding Application No. PCT/US2009/036312.
Patent Cooperation Treaty, Notification Concerning Transmittal of International Preliminary Report on Patentability for International Application No. PCT/US2009/036312, dated Sep. 16, 2010, 1 p.
Patent Cooperation Treaty, International Preliminary Report on Patentability for International Application No. PCT/US2009/036312, dated Sep. 7, 2010, 5 pp.

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