| 摘要 |
<p>The carriage has three rollers (3) rotatably assembled on respective axes between two side faces of a cage (2) inserted in a hollow parallelepiped support (1). The support comprises two side ramps (110, 120) provided with two rectilinear slopes supported against parallelepiped shape bearings (20) with concave curves (23, 24) to define tangency points. The bearings carry corresponding side faces (21, 22) of the cage. The tangency points are situated respectively on two sides of a circumference of the median roller and between the axes of rotation of the rollers.</p> |
