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Class Information
Number: 175/299
Name: Boring or penetrating the earth > Below-ground (1) hammer, or (2) impact members > Resiliently biased
Description: Apparatus in which an elastic member acts upon the hammer or impact device to urge said hammer or impact device toward or away from a jarring position.










Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8651202 Percussion drilling assembly having a floating feed tube Feb. 18, 2014
8511403 Steerable ground piercing tools Aug. 20, 2013
8256539 Steerable ground piercing tools Sep. 4, 2012
8205690 Dual acting locking jar Jun. 26, 2012
7404458 Rotary percussive drilling device Jul. 29, 2008
7281575 Field adjustable impact jar Oct. 16, 2007
7163058 Hydraulic jar device Jan. 16, 2007
7111678 Field adjustable impact jar Sep. 26, 2006
7093677 Percussion drill head Aug. 22, 2006
7044240 Torque absorber for downhole drill motor May. 16, 2006
6951439 Dust collection unit Oct. 4, 2005
6896060 Downhole jarring tool adjuster May. 24, 2005
6745836 Down hole motor assembly and associated method for providing radial energy Jun. 8, 2004
6736223 Thrust control apparatus May. 18, 2004
6571870 Method and apparatus to vibrate a downhole component Jun. 3, 2003
6338387 Downward energized motion jars Jan. 15, 2002
6328101 Impact enhancing tool Dec. 11, 2001
6283229 Impact device for directional boring Sep. 4, 2001
6062324 Fluid operated vibratory oil well drilling tool May. 16, 2000
6035954 Fluid operated vibratory oil well drilling tool with anti-chatter switch Mar. 14, 2000
5875842 Multi-impact jarring apparatus and method for using same Mar. 2, 1999
5850884 Moling apparatus Dec. 22, 1998
5833541 Elastomeric joints having interlocking threaded portions Nov. 10, 1998
5669458 Rotary jar Sep. 23, 1997
5624001 Mechanical-hydraulic double-acting drilling jar Apr. 29, 1997
5503228 Jar apparatus and method of jarring Apr. 2, 1996
5425430 Jar enhancer Jun. 20, 1995
5330018 Auto set bi-directional jar Jul. 19, 1994
5318139 Reduced waiting time hydraulic drilling jar Jun. 7, 1994
5267613 Upstroke jar Dec. 7, 1993
5217070 Drill string jarring and bumping tool Jun. 8, 1993
5139086 Double acting accelerator jar Aug. 18, 1992
5052485 Jar mechanism Oct. 1, 1991
5022474 Multiple blow percussion drill assembly with rapid field maintenance and adjustment capability Jun. 11, 1991
5022473 Adjustable fishing jar Jun. 11, 1991
4919219 Remotely adjustable fishing jar Apr. 24, 1990
4865125 Hydraulic jar mechanism Sep. 12, 1989
4848454 Downhole tool for use with a ball and seat traveling valve for a fluid pump Jul. 18, 1989
4846273 Jar mechanism accelerator Jul. 11, 1989
4844183 Accelerator for fishing jar with hydrostatic assist Jul. 4, 1989
4844157 Jar accelerator Jul. 4, 1989
4727944 Percussion drill string assembly Mar. 1, 1988
4715454 Mechanical directional drilling jar with swivel means Dec. 29, 1987
4694917 Mechanical jarring devices for use in drilling Sep. 22, 1987
4688649 Mechanical drill string jar Aug. 25, 1987
4665998 Mechanical well jar May. 19, 1987
4658917 Enclosed jar tool Apr. 21, 1987
4646830 Mechanical jar Mar. 3, 1987
4629009 Method and apparatus for firing borehole perforating apparatus Dec. 16, 1986
4607692 Wireline jar Aug. 26, 1986

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