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Class Information
Number: 173/101
Name: Tool driving or impacting > Impacting devices (e.g., hammers) > Plural relatively moved hammer heads
Description: Apparatus in which the hammer includes plural relatively movable impacting heads which are adapted to alternately impart cyclic impacts to a tool.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7137458 |
Impact mechanism for a hammer drill |
Nov. 21, 2006 |
| 6460628 |
Rapper assembly |
Oct. 8, 2002 |
| 6431655 |
Breaker device for removing the tops of columns |
Aug. 13, 2002 |
| 5695254 |
Method and apparatus for breaking concrete or the like |
Dec. 9, 1997 |
| 4867251 |
Impact device |
Sep. 19, 1989 |
| 4723610 |
Percussion device |
Feb. 9, 1988 |
| 4594759 |
Surface-chiseling machine |
Jun. 17, 1986 |
| 4507014 |
Consolidating plank for a highway finishing machine |
Mar. 26, 1985 |
| 4458415 |
Hammer driven chopper |
Jul. 10, 1984 |
| 4356008 |
Knocking arrangement for electric precipitation |
Oct. 26, 1982 |
| 4339961 |
Pressure-responsive apparatus for assembling track links or the like |
Jul. 20, 1982 |
| 4258956 |
Method and apparatus for driving a single transversely elongated tool with a plurality of force transmitting beams |
Mar. 31, 1981 |
| 4247149 |
Mechanically actuated impact mechanism |
Jan. 27, 1981 |
| 4153121 |
Fluid operated undercutter |
May. 8, 1979 |
| 4143719 |
Multi-vibro pile hammer |
Mar. 13, 1979 |
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