A unit according to claim 7 wherein said supporting platform is disc-shaped and has a flange adjacent its periphery, and said braking means being mounted on said first member and being adapted to engage said flange.ġ1. A unit according to claim 7 wherein said flat circular friction surface is secured to the underside of said skirt member.ġ0. A unit according to claim 7 wherein said skirt member is a split construction, a fastening means securing together said skirt member and securing said skirt member to another part of said other member.ĩ.
A turntable unit comprising a stationary non-rotatable first member, a second member, mounting means rotatably mounting said second member on said first member, said second member including a supporting platform adapted to support a construction assembly drive means for rotating said second member on said first member, a flat circular friction surface at a periphery of one of said members, braking means separate and apart from said drive means mounted on the other of said members for engaging said flat circular friction surface for holding said second member stationary relative to said first member, said drive means including a ring gear fixedly carried by one of said members, a drive unit carried by the other of said members, a pinion gear carried by said drive unit drivingly engaging said ring gear, said ring gear being an internal gear said mounting means including said ring gear having an external surface configurated to define a pair of spaced first raceways, said other member including an annular skirt generally surrounding said ring gear and having second raceways opposing said first raceways, and compliments of rolling elements disposed between said raceways.Ĩ. A unit according to claim 1, mounted on a vehicle.ħ. A unit according to claim 1 wherein said braking means comprises a plurality of spring loaded hydraulically operated disc brakes located at spaced intervals around said second member.Ħ. A unit according to claim 1 wherein said supporting platform is disc-shaped and has a flange adjacent its periphery, and said braking means being mounted on said first member and being adapted to engage said flange.ĥ. A unit according to claim 2 wherein said construction assembly is a rock drill assembly.Ĥ. A unit according to claim 1 having a construction assembly and an operator control cabin mounted on said second member.ģ. A turntable unit comprising a stationary nonrotatably first member, a second member, mounting means rotatably mounting said second member on said first member, said second member including a supporting platform adapted to support a construction assembly drive means for rotating said second member on said first member, a flat circular friction surface at a periphery of one of said members, braking means separate and apart from said drive means mounted on the other of said members for engaging said flat circular friction surface for holding said second member stationary relative to said first member, said first member defines the inner race of a double ballbearing arrangement and the second member is disc-shaped with a downwardly extending annular skirt defining the outer race of said double ballbearing arrangement said first member having an inwardly facing gear ring engaging a pinion gear on a shaft mounted for rotation with said second member and driven by a motor mounted on said second member a flange extending radially outwardly from said annular skirt and a plurality of spring loaded disc brakes mounted on said first member at spaced intervals around said second member adapted to engage said flange.Ģ.
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