Implements or apparatus for applying pushing or pulling force – Hoisting truck – Screw
Patent
1978-08-23
1980-02-19
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Hoisting truck
Screw
B66F 308
Patent
active
041891287
ABSTRACT:
The manual lifter and mover assembly or dolly includes a base and a vertically movable carriage mounted on the base. The base is provided with a pair of wheels and includes a pair of parallel channel members of equal length forming tracks which face the carriage. The carriage has a pair of outer vertical elements and an intermediate vertical element. A lift plate or fork-like element is carried by the lower end of the carriage for engaging and supporting the load. A pair of roller assemblies are carried by each of the outer vertical elements, with the roller assemblies extending into the opposite tracks of the channel members. A manually operated nut and screw jack assembly is interposed between the base and the carriage, with the jack assembly having a pair of telescopically arranged inner and outer tubes. The lower end of the inner tube is secured to the base while the outer tube is secured to the intermediate vertical element of the carriage. With such a construction, manual operation of the nut and screw jack assembly provides relative vertical movement between the inner and outer tubes and in turn relative vertical movement between the carriage and the base thereby raising or lowering the lift element.
REFERENCES:
patent: 2548806 (1951-04-01), Montour
Equipment Company of America
Watson Robert C.
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