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Class Information
Number: 173/138
Name: Tool driving or impacting > Impacting devices (e.g., hammers) > Hammer head constitutes piston of drive motor > With means to conduct motive fluid to or from striking face
Description: Apparatus in which a passage or port is provided to conduct fluid motive material to or from the surface of the element that strikes the blow, generally for the purpose of cooling, lubrication or the removal of leakage motive fluid.










Patents under this class:

Patent Number Title Of Patent Date Issued
8613327 Fluid powered percussion tool Dec. 24, 2013
8167055 Percussion device actuated by a pressurized non-compressible fluid May. 1, 2012
8151901 Impact device and method for generating stress pulse therein Apr. 10, 2012
8069928 Percussion device, drilling machine including such a percussion device and method for controlling such a percussion device Dec. 6, 2011
7926690 Combustion powered driver Apr. 19, 2011
7878263 Pressure-fluid-operated percussion device Feb. 1, 2011
7306047 Impact hammer drill Dec. 11, 2007
7252155 Percussive power tool with flushing head Aug. 7, 2007
7156190 Impact tool Jan. 2, 2007
7051568 Multi-purpose hydraulic tool May. 30, 2006
7040417 Drilling systems May. 9, 2006
6834731 Staple gun apparatus for attaching tab Dec. 28, 2004
6679340 Hydraulic tool Jan. 20, 2004
6510902 Method and device for determining the operating time and the operating condition of a hydraulic percussion unit Jan. 28, 2003
6415876 Hand-held tool with a linear oscillating drive Jul. 9, 2002
6371222 Hammer device Apr. 16, 2002
6209659 Hand-held drill with a compressed air-operated hammer mechanism Apr. 3, 2001
6202757 Impact machine Mar. 20, 2001
6119795 Hydraulic hammer having improved seal ring Sep. 19, 2000
6073706 Hydraulically operated impact device Jun. 13, 2000
5960893 Fluid-powered percussion tool Oct. 5, 1999
5944120 Hydraulic hammer assembly having low vibration characteristics Aug. 31, 1999
5890548 Hydraulic percussion hammer Apr. 6, 1999
5586606 System for lubricating and reciprocating a piston in a fluid-activated, percussive paving breaker Dec. 24, 1996
5582257 System for lubricating and reciprocating a piston in a fluid-activated, percussive paving breaker Dec. 10, 1996
5392865 Hydraulic percussion apparatus Feb. 28, 1995
5379849 Hydraulic ram assemblies Jan. 10, 1995
5259463 Throttle lever system for a percussive, fluid-activated apparatus Nov. 9, 1993
5129466 Hydraulically operated striking mechanism Jul. 14, 1992
5115875 Hammer drills for making boreholes May. 26, 1992
5056606 Damped hammer drill Oct. 15, 1991
5027490 Apparatus for inserting fasteners Jul. 2, 1991
4974685 Freeze plug installation tool Dec. 4, 1990
4921056 Hammer drills for making boreholes May. 1, 1990
4582145 Pressure-medium driven percussion device Apr. 15, 1986
4553610 Hydraulic striking machine Nov. 19, 1985
4534422 Fluid operated hammer Aug. 13, 1985
4506742 Vibrationless percussion tool Mar. 26, 1985
4497376 Interchangeable ram diesel pile Feb. 5, 1985
4261249 Hammer Apr. 14, 1981
4094366 Pneumatic percussion machines Jun. 13, 1978
4074777 Pneumatic impact tool Feb. 21, 1978
4056150 Ram device Nov. 1, 1977











 
 
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