A rear vehicle assembly includes a body structure, a moveable tailgate, and an opening and closing device. The opening and closing device includes connecting rods fixing the tailgate to the body structure. The connecting rods are hinged at a first end to the body structure and at a second end to a lateral edge of the tailgate. One of the connecting rods includes first and second rectilinear sections and a curved section. The first and second rectilinear sections are located on respective concave and convex sides of the curved section.

An opening and closing mechanism includes a dead-center spring element for a swivelable part, and a control curve is provided on a side wall of the swivelable part, and the dead-center spring element engages the control curve via a swivelable control lever to control an opening and closing force progression with the aid of the control curve.

The rear vehicle assembly comprises: a body structure delimiting an opening, a tailgate that is movable relative to the body structure between an open position, and a closed position, an opening and closing device comprising at least a first connecting rod and a second connecting rod fixing the tailgate to the body structure, wherein the first connecting rod and the second connecting rod are each hinged at a first end to the body structure, and at a second end to the first lateral edge of the tailgate.

The first connecting rod comprises a first rectilinear section, a curved section, and a second rectilinear section.

An opening and closing mechanism includes a dead-center spring element for, for example, a swivel compartment, and proposes that a control curve be provided on a side wall of the swivel compartment, at which the dead-center spring element engages via a swivelable control lever. The opening and closing force progression can be controlled with the aid of the control curve.

Disclosed is an open top hopper window with a hopper window and a frame. The frame includes top edge and bottom edges, and left and right sides. The inn part of the right and left sides of the frame has a guide groove located at the bottom of the side, with a hole in the frame located above such guide groove. The joining between the hopper window and the frame uses two bolts at the outer bottom sides of the hopper window sliding into the guide grooves and two arms linking the holes at the frame with two holes at the hopper window wherein the two holes are located at the 35%-40% range of the total length of the hopper window on the outer sides of the hopper window always achieving an equilibrium position which allows positioning the hopper window at different opening angles and positions without effort.