A pavement planing machine for roadways and the like, said machine comprising:
- a frame having a forward end and a rearward end,
- a pair of forward drive assemblies disposed in side by side spaced apart relation at the frame forward end upon which said frame forward end rests,
- said drive assemblies being connected to said frame for independent vertical adjustment of said frame relative to the respective forward drive assemblies,
- a rearward drive assembly adjacent the rearward end of said frame on which said frame rearward end rests,
- means for pivotally connecting said rearward end drive assembly to said frame for pivotal movement of said frame about a horizontal axis extending forwardly and rearwardly of said frame and centered adjacent the midportion of said frame,
- said drive assemblies being at a level that is below said horizontal axis,
- said frame having fixed to same on either side of same a depending side sheet,
- with said side sheets extending downwardly to said level,
- a planing cylinder journaled at said level between said side sheets to extend transversely of said frame and be disposed at said level, for planing engagement with the pavement,
- said cylinder being disposed intermediate said frame ends,
- whereby vertical adjustment of said frame relative to the respective forward drive assemblies effects truing of said planing cylinder relative to the pavement for planing excisement of same free of vertical adjustment requirement of said frame relative to said frame rear drive assembly,
- means for driving said cylinder to rotate relative to said frame in the direction whereby the cylinder underside moves forwardly of said frame, and comprising a separate drive device mounted on said frame at each end of said cylinder and received within the respective cylinder ends and coupled to said cylinder within same,
- said cylinder having external surfacing including means for fragmenting the pavement in planing same when rotated in said direction against the pavement surface when said machine is moved forwardly for upcutting excisement of the pavement,
- said cylinder surfacing extending lengthwise of said cylinder into close proximity to said side sheets,
- said drive assemblies including drive means for moving said machine forwardly along the pavement for moving said planing cylinder, when said cylinder is driven by said cylinder drive means in said direction, relative to the pavement, in the forward direction for planing excisement of the pavement,
- with the mass of said machine that is supported by said drive assemblies being oriented to dispose the center of gravity thereof above and in substantial vertical alignment with the forwardly disposed side portion of said planing cylinder external surfacing for countering upward forces acting on said cylinder on forward movement of said machine with said cylinder rotating in said direction thereof for said planing excisement of the pavement,
- said machine further including separate power jack means interposed between the respective forward drive assemblies and said frame for selectively shifting said frame forward end vertically of the respective forward drive assemblies and about said axis for effecting setting of said planing cylinder relative to the pavement at the desired planing levels and slope, whereby said machine mass as centered at said center of gravity is available to bear on the pavement being excised, on forward movement of said machine with said cylinder rotating in said direction thereof for said planing excisement of the pavement, through said cylinder, to resist shifting of said cylinder from said setting thereof,
- a mold board extending crosswise of said frame adjacent said planing cylinder and disposed rearwardly of and substantially paralleling said planing cylinder,
- said mold board being carried by said frame at said drive assembly level forwardly of said rearward drive assembly and said pivotal connecting means thereof,
- said mold board being positioned to receive and move forwardly, on forward movement of said machine along the pavement, pavement rubble formed by said rotation of said cylinder and moved over the top of said cylinder by said rotation of said cylinder,
- said mold board being formed to define a pavement rubble passing port opening rearwardly of said frame,
- an upright pavement rubble retainer fixed to said frame at said drive assembly level adjacent to but forwardly of said cylinder for holding adjacent said cylinder surfacing pavement rubble displaced by said planing excisement of said cylinder for movement over the top of said cylinder under said rotation of said cylinder,
- said planing cylinder surfacing including auger means for feeding the pavement rubble adjacent same laterally of said cylinder to said mold board port for passage therethrough rearwardly of said frame,
- and conveyor means carried by said frame and having a pavement rubble receiving end disposed at said drive assembly level in pavement rubble receiving relation with said mold board port forwardly of said rearward end drive assembly connecting means and below said horizontal axis level and a pavement rubble discharge end projecting rearwardly of said frame for conveying the pavement rubble for discharge from the rearward end of said frame.