Implements or apparatus for applying pushing or pulling force – Multiple lifters
Patent
1978-10-10
1980-06-10
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Multiple lifters
254105, B66F 712
Patent
active
042069068
ABSTRACT:
This specification discloses a jack capable of raising an object from ground level height to a predetermined height characterized by a superstructure that includes a base and a strong member above the base and connected thereto, the strong member having the plurality of stations at predetermined heights therealong; a lift bar for lifting the superstructure and the attached object; top fastener for fastening the lifting bar so as to prevent movement upwardly past the predetermined station on the superstructure; connecting means for connecting the superstructure with the object; extensible leg having a plurality of stations therealong and being slidably disposed in an aperture through the base; bottom fastener for fastening the base along the leg at a predetermined station to prevent downward movement past the station; a jacking means for raising the object by forcing the extensible leg and the lift bar apart so that by one or more cycles the object can be raised at a predetermined height by the jack. Also disclosed are preferred structural details including the simple bolt-on type jack and preferred, simple embodiments that are easily operable by one person.
REFERENCES:
patent: 3028143 (1962-04-01), Cheskin
patent: 3275298 (1966-09-01), Hand
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