Implement spring cushion |
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| 申请号 | US3620310D | 申请日 | 1969-07-22 | 公开(公告)号 | US3620310A | 公开(公告)日 | 1971-11-16 |
| 申请人 | MASSEY FERGUSON INC; | 发明人 | RICHEY CLARENCE B; | ||||
| 摘要 | A disc harrow comprises a peripheral frame and pairs of front and rear gangs mounted on gang frames. A foldable wing is provided at the end of each gang to enable folding to a narrower dimension for transport. The inner end of each gang frame mounts a plate having a threaded aperture that receives a bolt pivotally mounted on the implement pull tube. This permits pivotal movement of the gang frame about its longitudinal axis. Each gang frame projects outwardly through a rectangular aperture in the corner of the peripheral frame. A lever centrally pivoted to the peripheral frame corner engages the gang frame at one end. A compression spring unit pivoted to the frame corner is pivoted to the other end of the lever. As the discs encounter an obstruction, the gang frame pivots to lift the discs over the obstruction. This pivots the lever which compresses and pivots the spring unit such that increasing spring compression decreases the lever arm at which the spring acts on the lever. This provides a constant spring force resisting the pivotal movement of the gang frame. | ||||||
| 权利要求 | 1. An earthworking implement having a mounting frame adapted for pulling by a tractor, a tool frame extending laterally of the mounting frame, an earthworking tool mounted beneath the tool frame, pivot means mounting the tool frame on the mounting frame for pivotal movement about an axis extending along the tool frame to permit movement of the tool over obstructions, the pivot means mounting the tool frame on the mounting frame include a pin carried by the mounting frame and an apertured plate carried by the one end of the tool frame and engaging the pin for relative pivotal movement about the aforesaid axis, wherein the pin and apertured plate are cooperably threaded for engagement to restrain movement of the tool frame along the axis, and spring cushion means interconnecting the mounting and tool frames opposing pivotal movement of the tool frame relative to the mounting frame with a substantially constant force. 2. An earthworking implement having a mounting frame adapted for pulling by a tractor, a tool frame extending laterally of the mounting frame, an earthworking tool mounted beneath the tool frame, pivot means mounting the tool frame on the mounting frame for pivotal movement about an axis extending along the tool frame to permit movement of the tool over obstructions, and spring cusHion means interconnecting the mounting and tool frames opposing pivotal movement of the tool frame relative to the mounting frame, the spring cushion means include a spring unit pivotally mounted on the mounting frame, a lever pivotally connected to the mounting frame, and means pivotally connecting the lever to the spring unit at a spaced point for stressing the spring unit at a lever arm length, the lever engaging an intermediate portion of the tool frame at a spaced point for pivotal movement in response to pivotal movement of the tool frame, such pivotal movement of the lever effecting increasing stressing of the spring unit at a decreasing lever arm length to provide a substantially constant force opposing tool frame pivotal movement. 3. An earthworking implement having a mounting frame adapted for pulling by a tractor, a tool frame extending laterally of the mounting frame, an earthworking tool mounted beneath the tool frame, pivot means mounting the tool frame on the mounting frame for pivotal movement about an axis extending along the tool frame to permit movement of the tool over obstructions, and spring cushion means interconnecting the mounting and tool frames opposing pivotal movement of the tool frame relative to the mounting frame, the spring cushion means include a lever centrally pivoted to the mounting frame, means engaging one end of the lever with the tool frame for pivotal movement thereby upon pivotal movement of the tool frame, a spring unit pivoted to the mounting frame, and means pivoting the other end of the lever to the spring unit for increasingly stressing the spring unit at a decreasing lever arm length upon pivotal movement of the tool frame to provide the substantially constant force opposing pivotal movement of the tool frame relative to the mounting frame. |
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