Speed control system employed on swing-away ramp to prevent collision with airplane is described; two pumps, with 3- and 12-gpm capacities supply hydraulic system which positions this boarding ramp; solenoid-operated, 4-way valve combines both deliveries for fast approach and removal; two pairs of hydraulic cylinders swing and lift ramp into position; ramp is raised and lowered by other pair; center guide stabilizes vertical movement.
Two-speed system positions airplane boarding ramp
Hydraulics Pneumatics
Hydraulics and Pneumatics ; 18 , n 3
1965
2 pages
Article (Journal)
English
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NTIS | 1969
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