| 摘要 |
A colter arm having a colter on its rear end is connected to a rockshaft on a mounting bracket and is normally held in a working position by either a spring or a hydraulic cylinder acting between the mounting bracket and a lever arm on the rockshaft so that if the colter encounters an obstruction the spring or hydraulic cylinder will yield to permit the colter to move over the obstruction. The colter arm and one end of the rockshaft have complementary serrated faces which are clamped together to normally hold the colter arm and rockshaft in fixed relative positions. By loosening the bolt clamping the faces together the relative position of the colter arm with respect to the rockshaft can be varied, and, if the colter encounters an extra large obstruction, the bolt will stretch and permit the teeth of the serrated faces to slip and thereby prevent damage to the colter.
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