| 摘要 |
Device for pushing or pulling elongate axisymmetric objects along their axis, comprising at least two caterpillar tracks 1, 1C or two groups of two gears in the form of a bogie, which are symmetrical with respect to this axis, driven by a motor. It includes two successive independent systems of connecting rods in lozenge configuration, an upstream system with connecting rods 46, 57 which can pivot about bearings 12, 16, 28, 32 movable longitudinally parallel to the axis, and a downstream system with connecting rods which can pivot about two upstream bearings 18, 34 which can move longitudinally, and two downstream bearings 26, 38 which are fixed, the pins 1A, 1B for joining the connecting rods of the two systems being joined by longitudinal pins 24, 25 with two screw threads of opposite pitch, and the upstream and downstream bearings of each of the systems being provided with springs for returning the caterpillar tracks or groups of bogies towards one another 42, 44, 46, 48; 41, 43, 45, 47. <IMAGE>
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