3477120

Information

• Patent Grant
• 3477120

• References
• Source

• Patent Number

  3,477,120

• Date Filed

  Not available

• Date Issued

  Tuesday, November 11, 1969
  55 years ago

• CPC

  • E06C7/085 - achieved by deforming the rung or the stile
  • B21D39/044 - perpendicular
  • B21D39/063 - for assembling ladders
  • E06C7/087 - with a connecting piece installed around the rung
  • Y10T29/49915 - Overedge assembling of seated part
  • Y10T29/49934 - by axially applying force
  • Y10T29/4994 - Radially expanding internal tube

• US Classifications

  • 029 - Metal working
  • 182 - Fire escape, ladder, or scaffold