3521021

Information

• Patent Grant
• 3521021

• References
• Source

• Patent Number

  3,521,021

• Date Filed

  Not available

• Date Issued

  Tuesday, July 21, 1970
  54 years ago

• CPC

  • B23H7/18 - for maintaining or controlling the desired spacing between electrode and workpiece
  • F15B11/08 - with only one servomotor
  • F15B2211/20576 - with multiple pumps
  • F15B2211/30525 - Directional control valves
  • F15B2211/327 - electrically or electronically
  • F15B2211/35 - Directional control combined with flow control
  • F15B2211/61 - Secondary circuits
  • F15B2211/625 - Accumulators
  • F15B2211/7053 - Double-acting output members
  • F15B2211/765 - Control of position or angle of the output member
  • F15B2211/7733 - providing vibrating movement

• US Classifications

  • 219 - Electric heating
  • 091 - Motors: expansible chamber type
  • 384 - Bearings