Invention Grant
- Patent Title: Tubular access ladder and method
- Patent Title (中): 管状梯子和方法
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Application No.: US13134656Application Date: 2011-06-14
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Publication No.: US08348015B2Publication 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

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.
Public/Granted literature
- US20110240405A1 Tubular access ladder and method Public/Granted day:2011-10-06
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