| 摘要 |
The external sleeve of a slip brake in a torque wrench with a pair of clutches in series is provided with a spiral groove which houses lubricant. "O" rings at opposite ends of the external sleeve cooperate with an internal sleeve to seal in the lubricant. The slip brake of the present invention incorporates an internal split ring or drum which is adjustable to set the desired bias load of the slip brake. However, the split ring or drum is encased in a very thin steel sleeve which is attached, as by soldering, to the split ring. The outer surface of the thin steel sleeve abutts the inner surface of the outer ring and serves as the brake drum. Although the split ring is encased in a thin steel sleeve, the sleeve is thin enough (from about 0.025'' to 0.030'' thick) so that this sleeve will stretch when the split ring is expanded to increase the bias load on the slip brake. Thus, the thin metal sleeve cooperates with the grooved external sleeve and the "O" rings to provide a sealed in source of lubricant which assures a smooth rotary operation of the slip brake when the input force is delivered to relax the torquing load.
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