Invention Grant
US08348015B2 Tubular access ladder and method 有权
管状梯子和方法

  • Patent Title: Tubular access ladder and method
  • Patent Title (中): 管状梯子和方法
  • Application No.: US13134656
    Application Date: 2011-06-14
  • Publication No.: US08348015B2
    Publication Date: 2013-01-08
  • Inventor: Thomas W. Parker
  • Applicant: Thomas W. Parker
  • Applicant Address: US PA Greenville
  • Assignee: Werner Co.
  • Current Assignee: Werner Co.
  • Current Assignee Address: US PA Greenville
  • Agent Ansel M. Schwartz
  • Main IPC: E06C9/02
  • IPC: E06C9/02
Tubular access ladder and method
Abstract:
An access ladder includes a plurality of sections connected together to telescope between an extended position and a retracted position that has an increasing reactive force to counterbalance the weight of the sections as they extend. A method for accessing a room with a ladder connected to a ceiling including the steps of moving the ladder to a fully extended position subject to an increasingly active force to counterbalance the weight of the ladder as it extends. There is the step of retracting the ladder into a retracted position in the ceiling.
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