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An articulated coupler permits vertical displacement of a towed vehicle relative to a towing vehicle while preventing lateral or horizontal displacement of the towed vehicle relative to the towing vehicle. Multiple linkage arms provide coupling for special configuration towed vehicles such as short

An articulated coupler permits vertical displacement of a towed vehicle relative to a towing vehicle while preventing lateral or horizontal displacement of the towed vehicle relative to the towing vehicle. Multiple linkage arms provide coupling for special configuration towed vehicles such as short wheel-mounted lifts that experience torsional forces due to the presence and absence of loads on the lift.

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1. An articulated hitch coupler comprising: a vehicle channel secured to a towing vehicle hitching structure, the vehicle channel comprising an upper vehicle channel bushing and a lower vehicle channel bushing mounted in the vehicle channel;a trailer channel configured to be secured to a towed vehic

1. An articulated hitch coupler comprising: a vehicle channel secured to a towing vehicle hitching structure, the vehicle channel comprising an upper vehicle channel bushing and a lower vehicle channel bushing mounted in the vehicle channel;a trailer channel configured to be secured to a towed vehicle, the trailer channel comprising an upper trailer channel bushing and a lower trailer channel bushing mounted in the trailer channel;coupling means for coupling the towing vehicle unit to the towed vehicle unit, the coupling means comprising a plurality of linkage arms pivotably coupling the upper and lower vehicle channel bushings to the upper and lower trailer channel bushings, the plurality of linkage arms comprising: a first upper linkage arm having a first end pivotably coupled to the upper vehicle channel bushing and having a second end pivotably coupled to the upper trailer channel bushing;a first lower linkage arm having a first end pivotably coupled to the lower vehicle channel bushing and having a second end pivotably coupled to the lower trailer channel bushing;a second upper linkage arm having a first end pivotably coupled to the upper vehicle channel bushing and having a second end pivotably coupled to the upper trailer channel bushing; anda second lower linkage arm having a first end pivotably coupled to the lower vehicle channel bushing and having a second end pivotably coupled to the lower trailer channel bushing;wherein the first and second upper linkage arms are mounted on opposing external sides of the trailer channel and opposing external sides of the vehicle channel;further wherein the first and second lower linkage arms are mounted on opposing external sides of the trailer channel and opposing external sides of the vehicle channel;further wherein the first and second upper arms are parallel to one another; further wherein the first and second lower arms are parallel to one another; andfurther wherein the first upper arm is parallel to the first lower arm;further wherein the coupling means is configured to permit vertical displacement of the trailer channel relative to the vehicle channel and further wherein the coupling means is configured to prevent lateral angular displacement of the trailer channel relative to the vehicle channel; anda biasing element mounted to the coupler and configured to resist vertical displacement of the trailer channel relative to the vehicle channel. 2. The articulated hitch coupler of claim 1 wherein each linkage arm is pivotably bolted inside the trailer channel and inside the vehicle channel. 3. The articulated hitch coupler of claim 1 further comprising a hitching weldment comprising a draw bar welded to the vehicle channel, wherein the hitching structure comprises the draw bar, and further wherein the hitching weldment is vertically reversible. 4. The articulated hitch coupler of claim 1 wherein each linkage arm comprises a mechanical stop configured to limit linkage arm rotation. 5. An articulated hitch coupler comprising: a towing vehicle unit comprising a vehicle channel welded to a draw bar, the vehicle channel comprising an upper vehicle channel bushing mounted in the vehicle channel and a lower vehicle channel bushing mounted in the vehicle channel;a towed vehicle unit comprising a trailer channel configured to be secured to a towed vehicle, the trailer channel comprising an upper trailer channel bushing mounted in the trailer channel and a lower trailer channel bushing mounted in the trailer channel;coupling means for coupling the towing vehicle unit to the towed vehicle unit, the coupling means comprising four linkage arms comprising: a first upper arm having a first end pivotably coupled to the upper vehicle channel bushing and having a second end pivotably coupled to the upper trailer channel bushing;a second upper arm having a first end pivotably coupled to the upper vehicle channel bushing and having a second end pivotably coupled to the upper trailer channel bushing;a first lower arm having a first end pivotably coupled to the lower vehicle channel bushing and having a second end pivotably coupled to the lower trailer channel bushing; anda second lower arm having a first end pivotably coupled to the lower vehicle channel bushing and having a second end pivotably coupled to the lower trailer channel bushing; andbiasing means mounted to the coupling means and configured to resist vertical displacement of the trailer channel relative to the vehicle channel;wherein the coupling means is configured to permit vertical displacement of the trailer channel relative to the vehicle channel and prevent lateral angular displacement of the trailer channel relative to the vehicle channel. 6. The articulated hitch coupler of claim 5 wherein the first and second upper arms comprise steel bars mounted on opposing external sides of the trailer channel and opposing external sides of the vehicle channel; further wherein the first and second lower arms comprise steel bars mounted on opposing external sides of the trailer channel and opposing external sides of the vehicle channel. 7. The articulated hitch coupler of claim 6 wherein each linkage arm coupling to a bushing comprises a bolt permitting rotation of the linkage arm relative to the bushing to which it is pivotably coupled. 8. The articulated hitch coupler of claim 7 wherein the first and second upper arms are parallel to one another; further wherein the first and second lower arms are parallel to one another; and further wherein the first upper arm is parallel to the first lower arm. 9. The articulated hitch coupler of claim 5 wherein the biasing means comprises one or more springs mounted to the coupling means to resist vertical displacement of the trailer channel relative to the vehicle channel. 10. The articulated hitch coupler of claim 5 wherein the vehicle unit is configured to be rotated 180° to provide multiple height and mounting positions of the vehicle channel relative to the trailer channel. 11. The articulated hitch coupler of claim 10 wherein the vehicle channel further comprises third and fourth bushings mounted in the vehicle channel to provide alternative coupling options for the linkage arms. 12. The articulated hitch coupler of claim 5 wherein the towed vehicle unit comprises pivoting ground-engaging wheels or casters below a cargo platform. 13. The articulated hitch coupler of claim 5 wherein each linkage arm comprises a mechanical stop configured to limit linkage arm rotation. 14. An articulated hitch coupler comprising: a vehicle channel secured to a towing vehicle hitching structure, wherein the hitching structure comprises a draw bar welded to the vehicle channel, the vehicle channel comprising an upper vehicle channel bushing mounted in the vehicle channel and a lower vehicle channel bushing mounted in the vehicle channel;a trailer channel configured to be secured to a towed vehicle, the trailer channel comprising an upper trailer channel bushing mounted in the trailer channel and a lower trailer channel bushing mounted in the trailer channel;coupling means for coupling the vehicle channel to the trailer channel, the coupling means comprising four linkage arms comprising: a first upper arm having a first end pivotably coupled to the upper vehicle channel bushing and having a second end pivotably coupled to the upper trailer channel bushing;a second upper arm having a first end pivotably coupled to the upper vehicle channel bushing and having a second end pivotably coupled to the upper trailer channel bushing;a first lower arm having a first end pivotably coupled to the lower vehicle channel bushing and having a second end pivotably coupled to the lower trailer channel bushing; anda second lower arm having a first end pivotably coupled to the lower vehicle channel bushing and having a second end pivotably coupled to the lower trailer channel bushing;wherein each linkage arm coupling to a bushing comprises a bolt permitting rotation of the linkage arm relative to the bushing to which it is coupled; andbiasing means mounted to the coupling means and configured to resist vertical displacement of the trailer channel relative to the vehicle channel;wherein the first and second upper arms comprise steel bars mounted on opposing external sides of the trailer channel and opposing external sides of the vehicle channel;further wherein the first and second lower arms comprise steel bars mounted on opposing external sides of the trailer channel and opposing external sides of the vehicle channel; andfurther wherein the coupling means is configured to permit vertical displacement of the trailer channel relative to the vehicle channel and prevent lateral angular displacement of the trailer channel relative to the vehicle channel.