Jackable prop

Details Jackable prop Jackable prop

1983-08-26

1984-10-30

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Special engaging elements

Sharing props

2483545, B66F 300

Patent

active

044796340

ABSTRACT:
A novel jackable prop or stand is provided herein. It includes a base including a transverse plate and a pair of widely-spaced-apart, forwardly-projecting feet. A pair of spaced apart, upstanding polygonal cross-section e.g. square, posts are secured to the jackable or stand prop, e.g. either to the transverse plate at the region of the forwardly projecting feet, or directly to an associated foot. A freely-vertically-movable lifting frame is slidably but not relatively rotatably mounted on the posts. The lifting frame includes: (i) a pair of bushing, each bushing having a cross-section similar to that of its associated post, each bushing having a length-to-width ratio of about 4-to-1, and being freely but not relatively rotatably slidably mounted on a respective post, each such bearing thus being precluded from slewing with respect to its associated post and also being inhibited from twisting and jamming when sliding with respect to its associated post; (ii) a transverse bar interconnecting the bushings; (iii) a forwardly projecting load bearing lifting arm, e.g. projecting forwardly from each of the bushings, or from the transverse bar; and (iv) engagement means or associated with the transverse bar, the engagement means being adapted to be engaged by disengageable operable elevating means, whereby operation of the disengageable elevating means causes the transverse bar, and hence the load bearing lifting arms to be raised and lowered against a load applied directly thereon. The prop also includes manually operated means independent of the elevating means and cooperating between each such bushing and its associated upstanding post, e.g. pins adapted to be inserted through aligned holes in the posts and bushings for holding the lifting frame at a predetermined raised vertical position on each associated post after the lifting frame has been so raised and upon disengagement and removal of the elevating means out of engagement with the engagement means. The jackable prop is adapted to be used with a mechanical or hydraulic jack which is adapted to be removable disposable between the base and the engagement means for raising the lifting frame relative to the base. A safe, reliable, rugged and versatile jackable prop or stand is thus provided.

REFERENCES:
patent: 1292823 (1919-01-01), Livesay
patent: 2852229 (1958-09-01), Gross
patent: 2867409 (1959-01-01), Southerwick
patent: 3028145 (1962-04-01), Brand
patent: 3035812 (1962-05-01), Wineteer
patent: 3073570 (1963-01-01), Harvey
patent: 3271006 (1966-09-01), Brown et al.
patent: 3834669 (1974-09-01), Reid

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