| 摘要 |
Interfering bosses are provided on the jaw and jaw link forming a pivoting jaw assembly for a power tong or back-up. The bosses are arranged to interfere and prevent over-center rotation of the jaw with respect to the jaw link. The jaw is pivotally mounted on the jaw link with a pin journaled in an aperture which is elongated in the direction of the axis of the bosses so that the jaw can be rotated over-center when desired.
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