Abstract: A method of employing an electric motor that is used to roll and unroll tarpaulin covers that is mounted to the front portion of a belly dump trailer in a fashion that allows it to move both fore and aft as the tarpaulin is rolled over the trailer box is provided. This mounting of the motor is primarily accomplished by the use of a pair of tubular slide rails that are horizontally positioned above a cross member of the trailer frame. The mounting of the electric motor to these slide rails is accomplished by the use of a pair of tubular motor runners that fit over the slide rails prior to the mount's final assembly. This design allows the electric motor assembly to move freely fore and aft within the confines of the horizontal slide rails. The motor assembly is then connected through a universal joint to the solid drive shaft which is connected through an additional universal joint to the tarpaulin roll tube.

Abstract: A method of providing secure attachment points for a rollable tarpaulin cover used in open top trailers is provided. This is accomplished by the use of cleats attached to the leading edge of a tarpaulin roll tube or shaft. These cleats engage a gear cog mounted to the side of the trailer when the tarpaulin is fully deployed. This arrangement provides additional points at which the tarpaulin can be secured to the trailer to provide a tight seal over the top of the trailer.

Abstract: A tonneau cover is provided that is attached at its most forward end to an adjustable tensioning rail which spans the front end of a pickup truck box. The tensioning rail is adjustably attached at its outside edges to two side rails which are attached to the inside of a pickup box. The adjustable attachment of the tensioning rail to the side rails is accomplished by the use of a tensioning screw and two attachment blocks. As the tensioning screw is moved forwards and backwards by the use of the adjustment knob, the tensioning rail is moved in a corresponding manner. This adjustment is preformed when the tonneau cover is in the open position, and thus, allows a user to obtain the desired amount if tightness when the tonneau cover is subsequently placed in the closed position.

Abstract: A crank handle (40) which is used in a roll-up flexible cover assembly (64) for an open container, such as a truck (68), includes a longitudinal tube (42) and a rotatable tube (44). The rotatable tube (44) has a longitudinal portion (46) being telescopically disposed in the longitudinal tube (42). The rotatable tube (44) is adjustable among a stored location, an adjusting position, and a working location. The crank handle (40) is extended at the working location, so that the operator can stand away from the side of the truck (68) and easily operate the crank handle (40). The crank handle (40) is retracted to the stored location, preferably on the side of the truck (68). The rotatable tube (44) of the crank handle (40) is turned to a desired direction at the adjusting position so that the crank handle (40) can be vertically stored in a desire location.