Implements or apparatus for applying pushing or pulling force – Step-by-step traveling bar – Pawl actuated
Patent
1981-09-28
1984-12-18
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Step-by-step traveling bar
Pawl actuated
B66F 100
Patent
active
044887051
ABSTRACT:
The present invention relates to a jacking apparatus for effecting relative vertical movement between an upright leg and a platform. The jacking apparatus includes a frame having at least two generally vertical parallel side rails. A carrier arranged adjacent the upright leg is movably carried along the frame by fluid cylinders for vertical movement relative to the rails. First and second elongated jack tracks are fixedly secured in a generally vertical orientation to the upright leg. Each of the jack tracks is received within a correspondingly shaped recess in the carrier. Each of the jack tracks further includes a plurality of regularly spaced openings extending completely through the jack track in a direction generally along the circumference of the leg. First and second pins supported by the carrier are selectively engaged in an aligned one of the openings in the first and second jack tracks to prevent vertical movement of the carrier relative to the leg. Each of the pins has a width which exceeds the width of the opening of the jack track in a circumferential direction of the leg. According to a further aspect of the present invention, three fluid cylinders are operably connected between the platform and the carrier for effecting movement of the carrier. The three fluid cylinders are arranged to partially surround the leg such that imaginary lines joining centers of the cylinders form an isosceles triangle. The base of the triangle is bisected by an imaginary line passing through the apex of the triangle and a central axis of the leg.
REFERENCES:
patent: 2932486 (1960-04-01), Suderow
patent: 3372907 (1968-03-01), Smulders et al.
patent: 3722863 (1973-03-01), Itoh et al.
patent: 3967457 (1976-07-01), Lovie
patent: 4277051 (1981-07-01), Lucas
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