| 摘要 |
A power tong (10) rotates a tubular during makeup or breakout of the threaded connection. A tong frame (12), a rotatable ring (20), and a cage plate assembly may each have an open throat for receiving the tubular. A plurality of dies (32) are preferentially manufactured from aluminum, and each have a knurled surface for engaging the tubular. A fluid powered cylinder (54) increases tension between the brake band (50) and the cage plate assembly. Neutral cam portions of the cam surface one positioned radially outward substantially from the makeup and breakout cam portions. |
