Implements or apparatus for applying pushing or pulling force – Single throw lever – Special engaging feature
Patent
1988-05-24
1989-06-13
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Single throw lever
Special engaging feature
4146843, B66F 1100
Patent
active
048385212
ABSTRACT:
A lifting tool for heavy, flat, round covers, such as manhole covers, is disclosed. The covers include two pairs of diametrically opposed edge notches. The lifting tool comprises an upright column, the lower end of which terminates in a first pair of prongs or teeth that are adapted to cooperate with one of the notch pairs. A swing arm is pivotally connected to an intermediate portion of the tool's upright column. The swing arm includes one or more sets of teeth to facilitate lifting of covers having different diameters. The swing arm teeth are adapted to cooperate with the second pair of cover notches, to thereby facilitate lifting of the cover out of its casing by manual rotation of the upright column about the first pair of teeth. The upright column includes wheels that are located above the first set of teeth. These wheels are located so that they will not engage the ground until the cover has been lifted out of its casing, thus facilitating movement of a lifted cover. The tool can include a pin adapted to cooperate with a lifting hole that is provided in some, but not all, covers.
REFERENCES:
patent: 3985338 (1976-10-01), Heumann
patent: 4076217 (1978-02-01), Haller et al.
patent: 4126297 (1978-11-01), Barnes
patent: 4482182 (1984-11-01), Mortensen
patent: 4662607 (1987-05-01), Mochizuki et al.
Hancock Earl C.
Sirr Francis A.
Watson Robert C.
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