TRACTIVE DEVICE Russian patent published in 2009 - IPC B60D1/00 A01B59/04 

FIELD: transport.

SUBSTANCE: tractive device comprises coupler (1) linked with pull-rods and strength member (2), rigidly attached to semitrailer hitchbar. Pull-rods are jointed to trailer-hauling tractor via universal joint (4). Note here that, universal joint vertical axes of rotation are arranged on trailer-hauling tractor, while horizontal ones are fitted on said pull-rods. Aforesaid universal joints have their vertical axes of rotation located on one axial line. The lower universal joint is rigidly attached to bracket (10), while the upper one slides on sliding bar (9). The latter and bracket are jointed so as to allow the sliding bar to move in the plane perpendicular to tractor motion direction.

EFFECT: stable up and down run along slopes.

3 dwg