Patent ID: 7490856

Claim:
A head hauler comprising a chassis mounted on wheels, the chassis comprising: (a) a front transverse rail; (b) a rear transverse rail; (c) a fixed longitudinal rail on a first side that is fixed in vertical elevation and transverse horizontal position; (d) a movable longitudinal rail on a second side that is movable without tools in vertical elevation and transverse horizontal position, the movable longitudinal rail being supported by two support assemblies, one on the front transverse rail and one on the rear transverse rail, each support assembly comprising: (i) a transverse inclined bracket having an upper sloped surface that slopes downwardly in a direction toward the fixed longitudinal rail, the upper sloped surface having a slot; (ii) a screw extending parallel to and below the slot, the screw having a proximate end extending out of the bracket in a direction opposite the fixed longitudinal rail, the proximate end of the screw having a handle; (iii) a coupling attached to the transverse bracket and through which the screw passes near its proximate end; (iv) a threaded coupling through which the screw passes; (v) an underlying plate that underlies the slot, the underlying plate being attached to the threaded coupling; (vi) a means for attaching the plate to the movable longitudinal rail; such that rotation of the screw causes the threaded coupling to move along the screw which, in turn, causes the underlying plate to move along and below the upper sloped surface of the transverse bracket which, in turn, causes the movable longitudinal rail to move along and above the upper sloped surface to change its vertical elevation and transverse horizontal position.