Low ground clearance trailer

Claim 1

In a trailer suitable for towing behind a vehicle such as an automobile or light truck, a suspension height adjusting mechanism comprising: (a) a horizontal trailer frame having a generally flat floor surface and having first and second opposite sides; (b) at each of said first and second opposite sides of said trailer frame, an upright pylon affixed to said trailer frame extending above the plane of said flat floor surface and having thereon first and second pivot bearings in spaced vertical relationship; (c) at each pylon, a wheel hub having first and second pivot bearings in spaced vertical relationship; (d) between each pylon and each wheel hub, a first floating link connecting the first pivot bearing of said upright pylon to the first pivot bearing of said wheel hub; (e) between each pylon and each wheel hub, a second floating link in spaced parallel relationship with said first floating link and connecting the second pivot bearing of said pylon to the second pivot bearing of said wheel hub; (f) on each said opposite side of said trailer and in spaced parallel relationship therewith, a torsion bar having first and second ends; (g) means for adjustably fixing said first end of said torsion bar to said trailer frame so that axial rotation is prevented or allowed according to such adjustment wherein, with respect to each of said opposite sides of said trailer frame, the means for adjustably fixing said first end of said torsion bar to said trailer frame comprises: (i) a drilled collar block extending from said side of said trailer frame for receiving said first end of said torsion bar; (ii) screw threads at said first end of said torsion bar; (iii) a raised annular shoulder on said torsion bar; (iv) a nut and washer combination for turning onto said screw threads when said screw threads are inserted through said drilled collar block so that said drilled collar block is tightly held between the said annular shoulder and the said nut and washer combination; and (v) adjacent knurled surfaces on said annular shoulder and said drilled collar block for binding said torsion bar against axial rotation when said nut and washer combination is turned tightly against said collar block; and (h) means for fixing said second end of said torsion bar to said second floating link so that the pivot axis at said second pivot bearing of said pylon is coaxial relative to the torsion axis of said torsion bar.