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Class Information
Number: 173/137
Name: Tool driving or impacting > Impacting devices (e.g., hammers) > Hammer head constitutes piston of drive motor > Motive fluid applied to striking face > Reduced area striking face
Description: Apparatus in which the total area of the surface of the element to which fluid motive material is applied is greater than the area of the surface that strikes the blow.










Patents under this class:

Patent Number Title Of Patent Date Issued
7926690 Combustion powered driver Apr. 19, 2011
7757779 Compressed air percussive mechanism for a down hole hammer and down hole hammer Jul. 20, 2010
6988564 Diesel hammer systems and methods Jan. 24, 2006
6736218 Diesel hammer systems and methods May. 18, 2004
6675908 Drilling hammer or impact hammer Jan. 13, 2004
6202757 Impact machine Mar. 20, 2001
5960893 Fluid-powered percussion tool Oct. 5, 1999
5803182 Bidirectional hydraulic jar Sep. 8, 1998
5687803 Method for reversing a ground piercing tool Nov. 18, 1997
5603383 Reversible pneumatic ground piercing tool Feb. 18, 1997
5392865 Hydraulic percussion apparatus Feb. 28, 1995
5311950 Differential pneumopercussive reversible self-propelled soil penetrating machine May. 17, 1994
4821812 Down hole drill improvement Apr. 18, 1989
4651833 Pneumatic impact tool Mar. 24, 1987
4637476 Percussive action machine for making holes in the ground Jan. 20, 1987
4530407 Fluid operated hammer Jul. 23, 1985
4298074 Surgical device using impulse motor Nov. 3, 1981
4232752 Method and apparatus for driving pipe Nov. 11, 1980
4129002 Cylinder piece for a pile driving ram Dec. 12, 1978
4120367 Pneumatic impact gun Oct. 17, 1978
4114700 Pneumatic apparatus of the percussive type Sep. 19, 1978
4102534 Pneumatic hammer Jul. 25, 1978
4096916 Diesel pile driver Jun. 27, 1978
4084646 Fluid actuated impact tool Apr. 18, 1978
4076081 Pile driving device Feb. 28, 1978
4074776 Diesel pile-driving ram Feb. 21, 1978
4072198 Hydraulic rock drill Feb. 7, 1978
4067402 Rammer Jan. 10, 1978
4060139 Underwater gas discharge hammer with gas reservoir Nov. 29, 1977
4056150 Ram device Nov. 1, 1977
4039034 Pneumatic impact gun Aug. 2, 1977
3986567 Hydraulic percussive-rotary machine Oct. 19, 1976
3974885 Pneumatic percussive power tool Aug. 17, 1976
3967688 Fuel injection device for an impact atomization-type diesel pile hammer Jul. 6, 1976
3948058 Device for soil sampling under water Apr. 6, 1976











 
 
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