Adaptive carrier insert bar assembly

1. An insert bar assembly for a hitch-rack load carrier comprising a leveraged, diagonally directed expander for securing the insert bar assembly in a rectangularly shaped hitch receiver, the insert bar assembly comprising:

an elongate hitch-attachment bar having a length, width and height, and comprising a hitch-receiver insert portion located proximate a lead-in end of the bar;

an expander that extends and retracts relative to an exterior surface of the hitch-receiver insert portion in response to relative motion of the expander on the bar; and

a leveraging rocker-arm inter-coupling the expander, the hitch-attachment bar and a manually operable actuator for moving the expander along the hitch-receiver insert portion in response to manipulation of the actuator.

2. The insert bar assembly as recited in claim 1 , wherein a body of the hitch-attachment bar is continuously solid along a substantial entirety of the length of the hitch-attachment bar.

3. The insert bar assembly as recited in claim 1 , wherein a body of the hitch-attachment bar is continuously solid along at least a majority of the length of the hitch-attachment bar.

4. The insert bar assembly as recited in claim 3 , wherein the expander has a wedge-shaped lower surface that abuttingly rests on a ramped exterior surface of the hitch-receiver insert portion.

5. The insert bar assembly as recited in claim 4 , wherein the hitch-attachment bar at the hitch-receiver insert portion is predominantly rectangularly shaped in cross-sections taken perpendicularly to the length of the bar, and the hitch attachment bar has a beveled corner constituting a diagonally outwardly facing exterior surface on which the ramped exterior surface of the hitch-receiver insert portion is located.

6. The insert bar assembly as recited in claim 5 , wherein the hitch-attachment bar at the hitch-receiver insert portion is substantially pentagon shaped in cross-sections taken perpendicularly to the length of the bar.

7. The insert bar assembly as recited in claim 5 , wherein the leveraging rocker-arm pivots in a plane perpendicular to the diagonally outwardly facing exterior surface.

8. The insert bar assembly as recited in claim 5 , wherein the leveraging rocker-arm pivots on a pivot axis oriented substantially parallel to the diagonally outwardly facing exterior surface.

9. The insert bar assembly as recited in claim 8 , wherein the leveraging rocker-arm pivots on a pivot axle extending across the hitch-attachment bar and intersecting diagonal corners of the hitch-attachment bar.

10. The insert bar assembly as recited in claim 8 , wherein the leveraging rocker-arm comprises a link arm located toward the expander from the pivot axle and a drive arm located on an opposite side of the pivot axle from the expander.

11. The insert bar assembly as recited in claim 10 , wherein the manually operable actuator further comprises:

a threaded bolt threadingly engaged in a threaded receiving aperture perpendicularly extending into the diagonally outwardly facing exterior surface of the hitch attachment bar;

a knob fixed upon the bolt and rotation of the knob in one direction causes advancement of the bolt into the threaded receiving aperture and rotation of the knob in the opposite direction causes advancement of the bolt out of the threaded receiving aperture; and

wherein the bolt extends through an aperture in the drive arm of the leveraging rocker-arm and the knob is located on an opposite side of the drive arm to the elongate hitch-attachment bar.

12. The insert bar assembly as recited in claim 10 , wherein the manually operable actuator further comprises:

a threaded shaft perpendicularly fixed to the diagonally outwardly facing exterior surface of the hitch attachment bar;

a knob threadingly engaged upon the shaft and rotation of the knob in one direction causes advancement down the shaft and rotation of the knob in the opposite direction causes advancement up the shaft; and

wherein the shaft extends through an aperture in the drive arm of the leveraging rocker-arm and the knob is located on an opposite side of the drive arm to the elongate hitch-attachment bar.

13. The insert bar assembly as recited in claim 12 , wherein the aperture in the drive arm of the leveraging rocker-arm is a slot that permits the drive arm to translate back and forth relative to the shaft.

14. The insert bar assembly as recited in claim 8 , wherein the link arm of the leveraging rocker-arm is pivotally coupled to one end of an elongate extension rod that is coupled at an opposite end to the expander.

15. The insert bar assembly as recited in claim 14 , the leveraging rocker-arm and the engagement between the wedge-shaped lower surface of the expander and the ramped exterior surface of the hitch-receiver insert portion are arranged so that a lengthwise axis of the elongate extension rod remains substantially parallel to a lengthwise axis of the elongate hitch-attachment bar during operation of the manually operable actuator.

16. An insert bar assembly for a hitch-rack load carrier comprising an expander for securing the insert bar assembly in a hitch receiver, the insert bar assembly comprising:

an elongate hitch-attachment bar comprising a hitch-receiver insert portion located proximate a lead-in end of the bar;

an expander that extends and retracts relative to an exterior surface of the hitch-receiver insert portion in response to relative lateral motion of the expander along an exterior surface of the bar; and

a leveraging rocker-arm inter-coupling the expander, the hitch-attachment bar and a manually operable actuator for moving the expander along the hitch-receiver insert portion in response to manipulation of the actuator.

17. The insert bar assembly as recited in claim 16 , wherein the elongate hitch-attachment bar is substantially square in cross-sectional shape and the expander extends and retracts diagonally relative to the bar.