Implements or apparatus for applying pushing or pulling force – Step-by-step traveling bar – Pawl actuated
Patent
1981-01-19
1983-04-12
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Step-by-step traveling bar
Pawl actuated
B66F 104
Patent
active
043795463
ABSTRACT:
A lifting jack for lifting loads and exerting a pulling force between two locations includes an I-beam standard having a series of uniformly shaped and evenly spaced apertures, an upper runner disposed about the standard and carrying a first climbing pin which is adapted to fit within a corresponding one of the various apertures, a lower runner disposed about the standard and carrying a second climbing pin also adapted to fit within a corresponding one of the various apertures. The upper and lower runners are connected together by a pitman and these three components are further assembled to a lever which is pivotally attached so as to provide a jacking action to the upper and lower runners. The lever has a pair of fulcrum points only one of which is used with any one jacking cycle, depending upon which runner is advancing and which climbing pin is to be inserted into a corresponding aperture. The pitman is arranged into a single-piece, U-shaped lateral cross-section configuration providing greater strength and durability at a very critical point in the construction. A reversing switch and reversing latch combination are arranged relative to the upper and lower runners so that the direction of movement of these runners may be reversed.
REFERENCES:
patent: D248460 (1978-07-01), Dunn et al.
patent: 1307968 (1919-06-01), Harrah
patent: 1374653 (1921-04-01), Harrah
patent: 1482846 (1924-02-01), Harrah
patent: 1822969 (1931-09-01), Johnson
patent: 2786650 (1957-03-01), Bottorff
patent: 3588046 (1977-06-01), Weaver
patent: 4055329 (1977-10-01), Hammond
Bloomfield Manufacturing Co., Inc.
Watson Robert C.
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