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Class Information
Number: 173/207
Name: Tool driving or impacting > Impacting devices (e.g., hammers) > Hammer head constitutes piston of drive motor > Having valve not directly associated with motive fluid for piston
Description: Apparatus having a means to control fluid flow not immediately involved with the force transmitting fluid for the hammer head.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7484570 |
Percussion device |
Feb. 3, 2009 |
| 7413027 |
Impact power tool with a precision controlled drive system |
Aug. 19, 2008 |
| 6691798 |
Variable hand pressure activated power tool |
Feb. 17, 2004 |
| 6672403 |
Method and apparatus for protecting a fluid-operated percussion device against no-load strokes |
Jan. 6, 2004 |
| 6641634 |
Hand-held tool with dust extraction |
Nov. 4, 2003 |
| 6619407 |
Air-operated hammer |
Sep. 16, 2003 |
| 6530435 |
Apparatus for a hand-held pneumatic impact tool |
Mar. 11, 2003 |
| 6491114 |
Slow start control for a hydraulic hammer |
Dec. 10, 2002 |
| 6488102 |
Hand-held pneumatic impact power tool |
Dec. 3, 2002 |
| 6334495 |
Fluid operated percussion device |
Jan. 1, 2002 |
| 6209659 |
Hand-held drill with a compressed air-operated hammer mechanism |
Apr. 3, 2001 |
| 6073706 |
Hydraulically operated impact device |
Jun. 13, 2000 |
| 6029753 |
Increased efficiency percussion piston and method for operating same |
Feb. 29, 2000 |
| 5884713 |
Vibration generating apparatus |
Mar. 23, 1999 |
| 5860481 |
Fluid-operated striker assembly with automatic stroke length variation |
Jan. 19, 1999 |
| 5718297 |
Hydraulic impact hammer |
Feb. 17, 1998 |
| 5653295 |
Hydraulic precussion hammer |
Aug. 5, 1997 |
| 5556649 |
Device for removing runners from molded products |
Sep. 17, 1996 |
| 5526885 |
Hydraulic device for driving piles |
Jun. 18, 1996 |
| 5520254 |
Fluid-actuated impact hammer |
May. 28, 1996 |
| 5392865 |
Hydraulic percussion apparatus |
Feb. 28, 1995 |
| 4947941 |
Single-stroke pneumatic apparatus |
Aug. 14, 1990 |
| 4945998 |
Hydraulic impact tool |
Aug. 7, 1990 |
| 4936393 |
Pneumatic tool |
Jun. 26, 1990 |
| 4899836 |
Hydraulic percussion instrument and method of operating same |
Feb. 13, 1990 |
| 4878550 |
Pilot-valve-controlled percussion drilling tool |
Nov. 7, 1989 |
| 4825960 |
Synchronized hydraulic hammer arrangement |
May. 2, 1989 |
| 4817737 |
Hydraulic striking device with impact frequency control |
Apr. 4, 1989 |
| 4750568 |
Pneumatic rescue tool |
Jun. 14, 1988 |
| 4745981 |
Hydraulic impact tool |
May. 24, 1988 |
| 4741404 |
Percussion tool utilizing negative pressure |
May. 3, 1988 |
| 4669553 |
Percussion tool |
Jun. 2, 1987 |
| 4646854 |
Hydraulic striking device |
Mar. 3, 1987 |
| 4557338 |
Tool, particularly a boring tool |
Dec. 10, 1985 |
| 4523647 |
Power hammer |
Jun. 18, 1985 |
| 4496007 |
Compressed-air pile-driver |
Jan. 29, 1985 |
| 4487274 |
Rock drills |
Dec. 11, 1984 |
| 4483402 |
Paving breaker |
Nov. 20, 1984 |
| 4444274 |
Liquid pressure striking device |
Apr. 24, 1984 |
| 4429752 |
Pneumatic motor for rock drills and the like |
Feb. 7, 1984 |
| 4413687 |
Hydraulically operated impact device |
Nov. 8, 1983 |
| 4327807 |
Percussion tool casing |
May. 4, 1982 |
| 4303133 |
Compressed-gas-operated reciprocating-piston devices |
Dec. 1, 1981 |
| 4303131 |
Compressed-gas-operated reciprocating piston devices |
Dec. 1, 1981 |
| 4149602 |
Hydraulically-operated percussive device |
Apr. 17, 1979 |
| 4111269 |
Hydraulically-powered impact tool |
Sep. 5, 1978 |
| 4100977 |
Drop hammers |
Jul. 18, 1978 |
| 4082471 |
Universal hydraulic impact tool |
Apr. 4, 1978 |
| 4062411 |
Hydraulic percussion tool with impact blow and frequency control |
Dec. 13, 1977 |
| 4052107 |
Hydraulic hammers hydraulically driven impactor |
Oct. 4, 1977 |
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