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Class Information
Number: 173/136
Name: Tool driving or impacting > Impacting devices (e.g., hammers) > Hammer head constitutes piston of drive motor > Motive fluid applied to striking face > Supplied through passage in striking face
Description: Apparatus in which the surface of the element which strikes the blow is provided with a port through which fluid motive material is supplied.










Patents under this class:

Patent Number Title Of Patent Date Issued
8181714 Pneumatic impact piercing tool May. 22, 2012
8151900 Percussion equipment driven by a pressurized incompressible fluid Apr. 10, 2012
8006776 Sliding pressure control valve for pneumatic hammer drill Aug. 30, 2011
7198120 Down-the-hole drill assembly Apr. 3, 2007
6994175 Hydraulic drill string Feb. 7, 2006
6896071 Drive systems and methods for sheet piles May. 24, 2005
6883618 Variable timing for front chamber of pneumatic hammer Apr. 26, 2005
6866104 Drop in dart activated downhole vibration tool Mar. 15, 2005
6736218 Diesel hammer systems and methods May. 18, 2004
6717055 Harness fixing device Apr. 6, 2004
6626247 Mechanism to fasten adaptors to a head portion of a post driver Sep. 30, 2003
6499544 Percussive down-the-hole hammer for rock drilling, and a one-way valve used therein Dec. 31, 2002
6371222 Hammer device Apr. 16, 2002
6209659 Hand-held drill with a compressed air-operated hammer mechanism Apr. 3, 2001
5992545 Down-the-hole drilling machine Nov. 30, 1999
5806608 Air-driven post driver Sep. 15, 1998
5778987 Guided drilling system with shock absorber Jul. 14, 1998
5685380 Reverse circulation down-the-hole drill Nov. 11, 1997
5350023 Pneumatic hammer Sep. 27, 1994
5234061 Percussion machine, for example self-propelled ram boring machine Aug. 10, 1993
5115875 Hammer drills for making boreholes May. 26, 1992
5056609 Valve assembly for a downhole to remove bore hole subsidence Oct. 15, 1991
4921056 Hammer drills for making boreholes May. 1, 1990
4917194 Improved downhole hammer Apr. 17, 1990
4911250 Pneumatic percussion hammer Mar. 27, 1990
4886128 Ram boring implement having a movable bit Dec. 12, 1989
4660658 Hydraulic down-the-hole rock drill Apr. 28, 1987
4651833 Pneumatic impact tool Mar. 24, 1987
4637476 Percussive action machine for making holes in the ground Jan. 20, 1987
4530408 Porting system for pneumatic impact hammer Jul. 23, 1985
4450920 Hydraulic reciprocating machines May. 29, 1984
4446929 Fluid operated rock drill hammer May. 8, 1984
4312412 Fluid operated rock drill hammer Jan. 26, 1982
4308925 Pneumatic impact motor Jan. 5, 1982
4305473 Power control device for pneumatic motors Dec. 15, 1981
4278135 Variable volume pneumatic drill Jul. 14, 1981
4159040 Pneumatic percussion tool Jun. 26, 1979
4100976 Pneumatic impact drilling tool Jul. 18, 1978
4070948 Pneumatic impact devices Jan. 31, 1978
4054180 Impact drilling tool having a shuttle valve Oct. 18, 1977
3970153 Pneumatic percussion machines Jul. 20, 1976
3964551 Pneumatic impact drilling tool Jun. 22, 1976











 
 
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