| 摘要 |
In a disc harrow implement, each of a plurality of disc blades is provided with a conical hub having a center aperture through which an arbor bolt is inserted along the length of the implement. First and second sections of a spool, or hub, positioned on the arbor bolt include respective facing, complementary, conical end portions positioned immediately adjacent opposite faces of the conical hub of the disc. The end portion of the first spool section is provided with a plurality of spool spacer pins around the periphery thereof. Similarly, the hub portion of the disc is provided with a plurality of peripheral apertures around the center aperture through which the spacer pins are inserted so as to abut the end portion of the second spool section when the disc is positioned between the respective spool sections. First and second resilient spacer members are respectively positioned between the respective conical portions of the disc and the first and second spool sections. The interconnecting spool assembly substantially increases the axial strength of the disc harrow and permits the disc blade to flex laterally and vertically relative to its axial support members. Each of the first and second resilient spacer members may be provided with a shoulder extension such that the disc blade is entirely encompassed by the resilient spacer members and is isolated from the interconnecting spool assembly in eliminating metal-to-metal contact therein for increased disc protection. One embodiment provides for selectively controlling the degree of flexibility in the axially aligned disc support members to accommodate various types of terrain and a range of disc blade gauges.
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