3760887

Information

• Patent Grant
• 3760887

• References
• Source

• Patent Number

  3,760,887

• Date Filed

  Not available

• Date Issued

  Tuesday, September 25, 1973
  51 years ago

• CPC

  • B25D9/26 - Control devices for adjusting the stroke of the piston or the force or frequency of impact thereof
  • E21B6/00 - Drives for combined percussion and rotary drilling
  • E21C3/04 - Hammer drilling machines in which the tool is hit by an impulse member
  • E21C3/24 - directly by air, steam, or gas pressure

• US Classifications

  • 173 - Tool driving or impacting
  • 091 - Motors: expansible chamber type
  • 092 - Expansible chamber devices