| 摘要 |
A light weight portable spreader type rescue tool for applying high push/pull forces comprising a pair of power-driven, light weight aluminum alloy force arms pivotally mounted on a body for swinging movement toward and away from one another. A hardened steel jaw tip member extends forwardly from each arm. The forward end of the arm has an I-cross-section with a central web and a pair of transverse flanges defining a pair of substantiallly rectangular cross-section sockets. The tip member has a main body portion and a shank comprising a pair of transversely spaced rearwardly extending tongues formed to fit snugly within the sockets in the arm. An annular cross-section hardened steel sleeve and a circular cross-section hardened steel pin are spaced apart along the shank and forcibly press-fitted through transverse, aligned, bored holes in the arm web and the jaw tip member shank tongues respectively. In addition, an auxiliary hardened steel strengthening pin is press-fitted into the sleeve. A plurality of concentric, cylindrical slip planes result from this pin and sleeve arrangement enabling controlled elastic deflection of the contacting aluminum and steel surfaces, within their respective yield points. Slippage along these planes may be enhanced by use of a lubricant such as powdered molybdenum disulfide during the press-fitting operation. An improved clevis with a permanently attached clevis pin is provided for use with the rescue tool.
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