| 摘要 |
<p>The pivot ploughshares are attached in pairs to one end of the crosspiece of a T-shaped plough beam (2). Pivot axles (153, 154) are positioned between the beam halves. A two-armed tensioner cam, or two one-armed tensioner cams (157) are hinged to the plough-beam (1) on a pivot pin (156). The frame (1) has two lugs (150, 151) each of which has a recess (152) containing a pin (153, 154) fixed to the plough beam (3). A rod (161) is hinged about a pin (160) on the tensioner cam (157). The rod (161) has a spring (162) on it and passes through an eyelet (163) against which the spring (162) rests, to allow the ploughshares to ride over obstacles.</p> |
