Raise-lower device

Details Raise-lower device Raise-lower device

1976-12-28

1978-10-31

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Hoisting truck

Single throw lever

B66B 1104

Patent

active

041230396

ABSTRACT:
A vehicle and a platform and means for lifting said platform relative to said vehicle. Lifting mechanism comprising four pairs of linkages, each defining isosceles triangles placed longitudinally on top of said vehicle and defining the shape of said platform. Front, intermediate and rear balance linkages connecting the upper ends of the links of the four pairs of linkages by common lateral connecting rods. The pairs of isosceles triangles being clevace mounted to the top of a ball bearing actuator nut assembly driven by a 12 volt motor through a central bar that is fastened on each end to the right and left-hand linkages assemblies; and limit switches to control the upward and downward movement of the platform.

REFERENCES:
patent: 1545223 (1925-07-01), Westrate
patent: 2625443 (1953-01-01), Sensenbaugh
patent: 3486583 (1969-12-01), Wiklurd

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