Implements or apparatus for applying pushing or pulling force – Rack and pinion
Patent
1990-07-23
1991-06-04
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Rack and pinion
74 89, 74422, B66F 302
Patent
active
050207776
ABSTRACT:
An inexpensive, self-locking, high-lift jack constructed of high strength materials. The jack comprises a rail having spaced apart parallel rows of offset notches and a base support stand in which the rail is vertically mounted. A rider member reciprocates on the rail. The rider includes a crankshaft having two diametrically offset pinions projecting out from opposite faces of a central support surface thereof. Each pinion is positioned to engage the notches of one of the pair of parallel rows of notches on the rail. The crankshaft is fixed to and projects from the rider housing which encloses both the pinions and the section of rail engaged thereby. The rider has an L-shaped lifting members extending therefrom which functions as a load platform. A handle is attached to the crankshaft and turning of the handle rotates the crankshaft to sequentially move the pinions into and out of the notches in the rail which has the effect of raising or lowering the rider and any load applied to the L-shaped lifting members. The crankshaft turns in a central guide of the housing which travels in a space between parallel rails during movement of the rider with respect to the rail.
REFERENCES:
patent: 189468 (1877-04-01), Johnson
patent: 444427 (1891-01-01), Edwards
patent: 1228015 (1917-05-01), Gates et al.
patent: 1410968 (1922-03-01), Urquhart
patent: 1584087 (1926-05-01), Gelder
patent: 2383204 (1945-08-01), LeVeque
patent: 3765651 (1973-10-01), Litterth
patent: 3850042 (1974-11-01), Litterth
LandOfFree
High lift jack does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with High lift jack, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High lift jack will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1021627