| 摘要 |
This invention relates to a door mechanism for a rotary power tong, such as used in well drilling operation. The door is pivoted to one of the bifurcated portions of the tong and a door locking mechanism is used to attach the swinging end of the door to the other bifurcated portion of the tong. At least one contact surface is attached to the door to transmit forces to the door and engage a hook-like member attached to the tong frame. At least one contact member is attached to the frame to transmit forces to the frame and engage a hook-like member attached to the door. Such contact engagements provide for door support in both radial and tangential directions.
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