초록 ▼

The present invention relates to a motorized drive system for covering and uncovering the top of an open truck box or the like and comprises a laterally operated roll tube for winding and unwinding a flexible cover over the top of a truck box. One lateral edge of the cover is fixed to one side edge

The present invention relates to a motorized drive system for covering and uncovering the top of an open truck box or the like and comprises a laterally operated roll tube for winding and unwinding a flexible cover over the top of a truck box. One lateral edge of the cover is fixed to one side edge of the box opening, and the other lateral edge is attached to a roll tube. A reversible rotary motor rotates the roll tube, in conjunction with an extensible pivot arm and a cable return mechanism utilizing a tapered grooved sheave to provide constant tension and to facilitate smooth and consistent rectilinear movement of the roll tube for winding and unwinding of the cover.

대표청구항 ▼

A closure system for covering and uncovering a box structure having front and back end walls connected by side walls defining a top rectangular opening, the system comprising: a flexible cover means for overlying the top of the walls with one edge of the cover fastened to one of the side walls; a ro

A closure system for covering and uncovering a box structure having front and back end walls connected by side walls defining a top rectangular opening, the system comprising: a flexible cover means for overlying the top of the walls with one edge of the cover fastened to one of the side walls; a roll tube means for lying parallel to the side walls while supported at the front and back walls, with the opposite edge of the cover fastened to said roll tube; drive means directly connected to the roll tube to cause the roll tube to rotate and deploy the cover from the roll tube across the opening of the box; and at least one return mechanism comprising a return cable means for fixation between the box structure and a tapered sheave rotatable with the roll tube, wherein the return cable is deployed from the tapered sheave at a rate equal to the rate of deployment of the cover onto the roll tube.