| 摘要 |
The present invention is addressed to a joint which includes an upper frame member carried by the forward unit and having a recess on its lower side and a lower frame member carried by the forward unit, having a recess on its upper side, and being spaced-apart vertically below the upper frame member so that the recesses are in vertical registration. The joint further includes a shaft carried by the rearward unit and a bearing retainer assembly carried by the end of the shaft and disposed between the recesses. The bearing assembly includes an annulus surmounting a hub connected to the shaft. Thrust bearings between the annulus and hub permit the hub to co-rotate with the shaft with respect to the annulus, while nibs carried by the annulus are associated with tapered roller bearings so that the outer annulus co-twists with the shaft respect to the forward unit.
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