B - Operations – Transporting – 66 – F
Patent
B - Operations, Transporting
66
F
254/125, 254/128
B66F 1/02 (2006.01) E02B 17/08 (2006.01) E04B 1/35 (2006.01) E04G 11/24 (2006.01)
Patent
CA 1049490
ABSTRACT OF THE DISCLOSURE A jacking assembly for moving a load, in steps, axially of a pipe comprises two pawl boxes having lateral platens and which are mounted at axially spaced positions on the pipe. The pawls of the boxes slope towards the pipe and exert a grip on it which allows relative movement between the boxes and the pipe to occur in one direction only. In- flatable hoses connected to a low pressure water supply are sandwiched between the platens and exert a thrust, when dilated, which increases non-linearly with water pressure, to move whichever of the pawl boxes is carrying the load. This movement, which provides the working stroke, is followed by a recovery stroke during which the pawl box not carrying the load is moved up to the other pawl box under the action of springs or a second inflatable hose. The assembly is able to lift a heavy load with a low pressure water supply and has no moving seals. Its operation in parallel with other such assemblies is also described for house building and slip forming purposes.
251714
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