Implements or apparatus for applying pushing or pulling force – Single throw lever – Mechanically actuated
Patent
1993-08-19
1994-12-27
Watson, Robert C.
Implements or apparatus for applying pushing or pulling force
Single throw lever
Mechanically actuated
B66F 300
Patent
active
053758145
ABSTRACT:
A jack apparatus for lifting an object along a substantially vertical path includes a base structure including a guide structure and an axle, a first member having a first end and a second end and a midsection, and constrained at the first end to slide along the guide structure and adapted at the second end to engage the object, the first member having a certain length, a second member pivotally connected to the midsection of the first member and extending a distance substantially half the certain length to pivotally connect to the axle, a drive mechanism for propelling the first end of the first member along the guide mechanism toward the axle to swing the first member progressively toward a vertical position, thereby lifting the object engaged at the second end of the first member. The drive mechanism is preferably a hydraulic cylinder. A housing is preferably provided around the cylinder, the housing having guide slots functioning as the guide structure through which the first member connects to the cylinder. The first member preferably includes two elongate side members and a connecting cross-member. The second end of the first member preferably includes a cross-bar for engaging the object to be lifted. The second member preferably includes two elongate side members and a connecting member.
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patent: 2361690 (1944-10-01), Hunz
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patent: 4641813 (1987-02-01), Arzouman
patent: 4690378 (1987-09-01), Jarman et al.
patent: 5065983 (1991-11-01), Slay
Van Der Wall R. J.
Watson Robert C.
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