Implements or apparatus for applying pushing or pulling force – Single throw lever – Special engaging feature
Patent
1985-03-29
1987-07-21
Schmidt, Frederick R.
Implements or apparatus for applying pushing or pulling force
Single throw lever
Special engaging feature
B66F 300
Patent
active
046813004
ABSTRACT:
A beam having intermediate the ends thereof at least one guide for a grab element provided to be detachably connected to the cover and at one end thereof has a support provided to act against a surface outside the cover and at the opposite end thereof a screw spindle, which is rotatably connected to a shoe, provided to act against a surface outside the cover and diametrically opposed to the first-mentioned surface.
The beam is further provided with guide means for receiving one end of a lever in such a manner that the lifted up cover can be pivoted about the rotational axis of the shoe to a place beside the manhole opening.
The lever is preferably shaped as a spanner and has a key to operate the screw spindle as well as cocks and the like.
REFERENCES:
patent: 2249603 (1941-07-01), Elkington
patent: 3353790 (1967-11-01), Drier
patent: 4076217 (1978-02-01), Haller et al.
patent: 4157809 (1979-06-01), Haller et al.
patent: 4157811 (1979-06-01), Haller et al.
patent: 4482182 (1984-11-01), Mortensen
Hartman Judy J.
Schmidt Frederick R.
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