Roll-up truck cover assembly

A roll-up truck cover assembly for dump trucks and the like having upstanding side and end walls defining an upwardly open body for receiving particulate material which may project upwardly beyond the sides of body;

• said cover assembly comprising a flexible top cover substantially co-existensive with the body cross section viewed from above, said cover extending across the top of a front end portion of said body and being attached thereto whereby completely to close said end portion of the body and to prevent air flow beneath the cover and billowing and particulate leakage, a take-up roll for said flexible cover having an opposite end portion of the cover attached thereto substantially across its width and having associated biasing means tending to rotate the roll in a take-up operation of the cover, a pair of similar arms pivotally mounted at lower end portions externally on opposite side walls of the truck body and having upper end portions connected with and rotatably supporting opposite end portions of said take-up roll, and operating means for swinging said arms rearwardly for an arcuate roll traverse of the truck body, the said rearward movement being a cover roll-out movement and being opposite to the direction which said biasing means tends to swing said arms while urging said cover in a take-up direction about said roll, said cover during both roll-out and take-up thus having substantially no horizontal component of movement with respect to said particulate material.