Hydraulic loading ramp

Claim 1

A retractable runway extendable between first and second load areas so that materials are moved therebetween, comprising: a. said first load area being the bed of a truck trailer; b. a first platform including a first pair of first spaced side ramps integrally connected by a transversely extending base portion, said base portion being pivotally connected to said truck trailer; c. a second platform pivotally connected with said first platform, said second platform including spaced, second side ramps pivotally connected with said first side ramps opposite said base portion and aligned with said first spaced side ramps; d. said fiRst and second spaced side ramps being movable between and extended position, to permit movement of materials between said first and second load areas, and a retracted position; e. support members extending downwardly from said second pair of spaced side ramps to support said first and second platforms in the extended position; f. said first side ramps being positioned approximately perpendicular to said truck trailer in said retracted position; g. said second ramps having forward openings formed therein permitting forward pivotal movement thereof with respect to said first ramps so that said trailer bed second ramps are folded to a substantially withdrawn downward position overlying the inside of said first side ramps in said retracted position; and h. hydraulic motor means for moving said first and second spaced side ramps between the extended position and the retracted position, said hydraulic motor means including: 1. a motor; 2. a hydraulic pump driven by said motor; 3. double acting hydraulic cylinders pivotally attached to the truck trailer and in fluid connection with said hydraulic pump; and 4. pistons, with piston rods connected thereto, sealably mounted in said hydraulic cylinders, said piston rods being pivotally attached to said first side ramps whereby hydraulic fluid entering said cylinders causes movement of said first side ramps.