Implements or apparatus for applying pushing or pulling force – Step-by-step traveling bar – Pawl actuated
Patent
1975-06-17
1977-02-15
Smith, Al Lawrence
Implements or apparatus for applying pushing or pulling force
Step-by-step traveling bar
Pawl actuated
61 98, B66F 100, E02D 2100
Patent
active
040079147
ABSTRACT:
Jacking apparatus is disclosed for effecting relative vertical movement between an upright leg and a platform. The jacking apparatus comprises a frame which includes a cross member mounted on the platform. Vertically spaced first and second fluid cylinders are carried by the platform, with the first cylinder being mounted on the cross member. Each fluid cylinder carries a beam and a holding device for selectively coupling the beam to the leg. The power cylinders and the holding devices are operated 180.degree. out of phase to effect step-by-step movement of the platform relative to the leg. Power transfer chains operably connect the first and second fluid cylinders to the cross member of the support frame to transfer forces from the first and second fluid cylinders directly to the cross member. As a result, a relatively balanced distribution of vertical forces is applied to the cross member thereby reducing its size requirements. A support frame includes an integral frame assembly arranged to be secured as a unit to the platform. A shock absorber mounting is provided for connecting the frame assembly to the platform and for absorbing forces transmitted between the platform and the leg. The shock absorber mounting includes a resilient pad formed of alternate layers of metal and resilient material. Cylinders may be arranged without power transfer means such that the application of pressure fluid against the head ends of the cylinder piston rods serves to raise the platform, thereby providing maximum lifting power during a platform raising operation.
REFERENCES:
patent: 2992812 (1961-07-01), Rasmussen et al.
patent: 3056585 (1962-10-01), Smulders
patent: 3804369 (1974-04-01), Sutton
Smith Al Lawrence
Watson Robert C.
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