Turntable mounted elevatable member

Details Turntable mounted elevatable member Turntable mounted elevatable member

E - Fixed Constructions

06

C

227/12

E06C 5/00 (2006.01) B66F 11/04 (2006.01) E06C 5/06 (2006.01) E06C 5/36 (2006.01) E06C 5/40 (2006.01)

Patent

CA 1209550

A B S T R A C T TURNTABLE MOUNTED ELEVATABLE MEMBER A turntable mounted elevatable member such as a ladder uses a dual concentric ram for elevation thereby providing two independent hydraulic circuits for safety and avoiding the need for mechanical locks. The single point mounting at each end of the ram permits the movement required for plumbing the ladder without the need for the complexity required to control two separate elevation rams during plumbing. The dual ram has a retraction chamber to enable the ladder to be held against lifting due to external influences. Lock valves for the separate volumes of the ram are built into the base. The invention can also be embodied in a turntable mounted elevatable man- carrying platform.

410910

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