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Class Information
Number: 175/296
Name: Boring or penetrating the earth > Below-ground (1) hammer, or (2) impact members > Fluid-operated
Description: Apparatus in which (1) the hammer or impact device is acted upon and propelled by a body of fluid to deliver a blow (2) a body of fluid acts directly upon the hammer or impact device, or on holding means therefor to restrain said device against movement, and means to relieve the device or holding means from the influence of the restraining fluid to deliver a blow or (3) a means for holding the hammer or impact device against movement is released by a body of fluid to deliver a blow.










Sub-classes under this class:

Class Number Class Name Patents
175/297 Restricted orifice for initially delaying escape of restraining fluid 104


Patents under this class:
1 2 3 4 5 6

Patent Number Title Of Patent Date Issued
8662202 Electro-mechanical thruster Mar. 4, 2014
8657040 Percussion drilling assembly and locking system therefor Feb. 25, 2014
8651202 Percussion drilling assembly having a floating feed tube Feb. 18, 2014
8640794 Pressurized fluid flow system for a normal circulation hammer and hammer thereof Feb. 4, 2014
8631884 Pressure reversing valve assembly for a down-the-hole percussive drilling apparatus Jan. 21, 2014
8627903 Percussion assisted rotary earth bit and method of operating the same Jan. 14, 2014
8622152 Down-the-hole drill hammer having a sliding exhaust check valve Jan. 7, 2014
8550155 Jarring method and apparatus using fluid pressure to reset jar Oct. 8, 2013
8544566 Fluid actuated impact tool with solid piston-standard bit arrangement and water seal Oct. 1, 2013
8499836 Electrically activating a jarring tool Aug. 6, 2013
8418783 Boom arrangement for a rock drill and rock drill rig Apr. 16, 2013
8365818 Jarring method and apparatus using fluid pressure to reset jar Feb. 5, 2013
8353369 Percussion assisted rotary earth bit and method of operating the same Jan. 15, 2013
8322463 Down hole multiple piston tools operated by pulse generation tools and methods for drilling Dec. 4, 2012
8307919 Clutch for a jack element Nov. 13, 2012
8302707 Down-the-hole drill reverse exhaust system Nov. 6, 2012
8297378 Turbine driven hammer that oscillates at a constant frequency Oct. 30, 2012
8230912 Hydraulic bidirectional jar Jul. 31, 2012
8215419 Variable frequency control for down hole drill and method Jul. 10, 2012
8167051 Selective agitation May. 1, 2012
8151910 Drilling jar Apr. 10, 2012
8141663 Down hole hammer having elevated exhaust Mar. 27, 2012
8132631 Method of geothermal loop installation Mar. 13, 2012
8109348 Down-the-hole hammer drill Feb. 7, 2012
8061450 Percussion drilling assembly having erosion retarding casing Nov. 22, 2011
8056648 Method and device Nov. 15, 2011
8051926 Control device Nov. 8, 2011
8047304 Expandable reamer for subterranean boreholes and methods of use Nov. 1, 2011
8011455 Down hole hammer having elevated exhaust Sep. 6, 2011
8006784 Backhead and drill assembly with backhead Aug. 30, 2011
7992652 Fluid distributor cylinder for percussive drills Aug. 9, 2011
7987930 Drill bit assembly for fluid-operated percussion drill tools Aug. 2, 2011
7921941 Pressurized fluid flow system for a reverse circulation hammer Apr. 12, 2011
7918290 Systems and methods for protecting drill blades in high speed turbine drills Apr. 5, 2011
7905289 Double-acting jar compounder Mar. 15, 2011
7896100 Valve device for a percussion device and a percussion device for a rock drilling machine Mar. 1, 2011
7874364 Method for jarring with a downhole pulling tool Jan. 25, 2011
7874382 Pneumatically reversible ram boring device Jan. 25, 2011
7857076 Force balancing system for use with a well bore tool Dec. 28, 2010
7836976 Underground piercing tool Nov. 23, 2010
7832504 Exhaust valve and bit assembly for down-hole percussive drills Nov. 16, 2010
7814995 Hydraulic jar and an overpressure relief mechanism therefor Oct. 19, 2010
7748478 Percussion drilling assembly and hammer bit with an adjustable choke Jul. 6, 2010
7721823 Moveable blades and bearing pads May. 25, 2010
7712554 Percussive drill bit provided with an improved chuck assembly May. 11, 2010
7712552 Water hammer May. 11, 2010
7661487 Downhole percussive tool with alternating pressure differentials Feb. 16, 2010
7617889 Backhead and drill assembly with backhead Nov. 17, 2009
7581602 Downhole hammer drill Sep. 1, 2009
7581599 Percussive device for a rock drilling machine, method for achieving a reciprocating piston movement and rock drilling machine Sep. 1, 2009

1 2 3 4 5 6










 
 
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