Implements or apparatus for applying pushing or pulling force – Fluid pressure – Vehicle attached
Patent
1983-09-16
1989-06-27
Schmidt, Frederick R.
Implements or apparatus for applying pushing or pulling force
Fluid pressure
Vehicle attached
72392, B66F 324
Patent
active
048422495
ABSTRACT:
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.
REFERENCES:
patent: 1412610 (1922-04-01), Foley
patent: 3819153 (1974-06-01), Hurst et al.
patent: 3967399 (1976-07-01), Heinold et al.
patent: 4333330 (1982-06-01), Porter
patent: 4462638 (1984-07-01), Den Besten
"Rescue Gator", 99850 Deluxe System, Catalog RG-8100, Walker Manufacturing, Jan. 1981.
"Hurst Hydraulic Tools", Hurst Performance Inc., Jan. 1983.
Hartman Judy J.
Schmidt Frederick R.
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