초록 ▼

A variable track wheel for example for agricultural tractors includes a wheel disc having peripherally spaced connections between it and helical rails secured to a wheel rim, each connection comprising two jaws, one secured to the disc and the other, being movable, is connected to the first jaw by a

A variable track wheel for example for agricultural tractors includes a wheel disc having peripherally spaced connections between it and helical rails secured to a wheel rim, each connection comprising two jaws, one secured to the disc and the other, being movable, is connected to the first jaw by a screwed connection. The jaws are arranged to be clamped to a portion of a helical rail and during clamping the movable jaw moves radially outwardly.

대표청구항 ▼

Adjustable tread wheel comprising a rim provided on its inner surface with a plurality of helical guide rails, each rail having a pair of flanks and an axially extending bearing surface, a wheel disc carrying a plurality of clamping devices each adapted to cooperate with a guide rail for connecting

Adjustable tread wheel comprising a rim provided on its inner surface with a plurality of helical guide rails, each rail having a pair of flanks and an axially extending bearing surface, a wheel disc carrying a plurality of clamping devices each adapted to cooperate with a guide rail for connecting the wheel disc to the rim in any given relative axial position, each clamping device comprising a fixed jaw secured to the disc, a movable jaw, each jaw having a bearing surface for engagement with the facing flank of the corresponding guide rail and a radial shoulder for engagement with the bearing surface of the guide rail, and a screw and nut assembly extending in a hole provided in each jaw, for urging the movable jaw towards the fixed jaw to clamp the guide rail therebetween, the axis of the screw being inclined with respect to the bearing surface of the guide rail so that the tightening of the screw and nut assembly results in a relative outward radial displacement of the movable jaw and the rail engaged thereby.