Fire escape – ladder – or scaffold – Means maintaining platform level on angularly movable support – Swingable support
Patent
1977-10-06
1979-07-10
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Means maintaining platform level on angularly movable support
Swingable support
182148, B66F 1104
Patent
active
041604920
ABSTRACT:
A mobile self-propelled aerial lift machine comprises a chassis, a swingable boom support structure mounted on the chassis, an elevatable telescopic boom mounted on the support structure and an adjustable work platform supported at the outer end of the boom. A plurality of hydraulic motors operable at variable speeds are provided to effect movement of the chassis, support structure, boom and work platform. The control system for the hydraulic motors includes an engine-driven destrokable radial piston-type pump mounted on the support structure and having a pressure port and a control (destroke) port whereby a change in the rate of fluid flow to the control (destroke) port effects a change in the fluid pressure at the pressure port. A plurality of solenoid operated selector valves are located on the support structure and are operable to permit fluid flow from the pressure port to the hydraulic motors. A control panel is located on the work platform and includes joystick-operated selector switches for operating the solenoids of the selector valves. A destroke conduit is provided for supplying fluid from the pressure port to the control (destroke) port and extends along the boom to the work platform. A pedal operated modulatable flow control valve is located on the work platform and connected to the destroke conduit for controlling fluid flow to the control (destroke) port to thereby control the speed of a hydraulic motor when the selector valve therefor is operated.
REFERENCES:
patent: 3890783 (1975-06-01), Allen
Machado Reinaldo P.
Nilles James E.
Simon-Krause, Inc.
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