Ladder or boom extension system

Fire escape – ladder – or scaffold – Ladder – Extension

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

182 66, E06C 506

Patent

active

043960936

ABSTRACT:
A ladder or boom extension system includes a base section, at least one movable section in telescoping arrangement with the base section, and a piston rod fixedly connected longitudinally of the base section. A double acting hydraulic cylinder is movable relative to the piston rod in response to the application of hydraulic forces on either side of a fixed piston. A crosshead including cable carrying pulleys is affixed at each end of the hydraulic cylinder whereby the cylinder and the crossheads travel as a unit for extension and retraction while tensioning in response to hydraulic forces. Extension and retraction cables interconnect between the base section and the movable section and are trained about the crosshead pulleys to pull the movable section toward or away from the base section. The crosshead pulleys tension the cables upon longitudinal movement of the cylinder to either extend or retract the movable section or sections relative to the base section as the cylinder is longitudinally urged along the piston rod.

REFERENCES:
patent: 2684159 (1954-07-01), Oldenkamp
patent: 2732992 (1956-01-01), Arps
patent: 2833422 (1958-05-01), Ferwerda
patent: 3059781 (1962-10-01), Bender
patent: 3836011 (1974-09-01), Sakamoto
patent: 4094381 (1978-06-01), Wilkerson
Extension System, of Ladder Towers, Inc., 7/21/80.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Ladder or boom extension system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Ladder or boom extension system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ladder or boom extension system will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-479931

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.