Lifting jack

Details Lifting jack Lifting jack

1996-09-09

1998-01-27

Eley, Timothy V.

Implements or apparatus for applying pushing or pulling force

Hoisting truck

Platform type

254 93R, 254 93L, 254129, 254130, 2541315, 254134, B60P 100

Patent

active

057115125

ABSTRACT:
A lifting jack for raising boats and other objects. It has an inner housing or tube which is supported from a flat base. An outer tube is slidably mounted over the inner tube. A hydraulic jack inside the inner tube raises and lowers the outer tube. Two parallel series of vertical catches are supported on the outside of the outer tube. A selected pair of these catches support a connecting rod which holds a pair of flat support arms in a fixed relationship. The arms support a lifting pad in a plurality of elevations for each pair of vertical catches. A safety latch permits the outer housing to be raised but must be manually released for lowering.

REFERENCES:
patent: 652836 (1900-07-01), Covert
patent: 833331 (1906-10-01), Michaelis
patent: 1554120 (1925-09-01), Mosher
patent: 2469670 (1949-05-01), Thompson
patent: 2684129 (1954-07-01), Jaseph
patent: 2786650 (1957-03-01), Bottorff
patent: 2867409 (1959-01-01), Southerwick
patent: 2937002 (1960-05-01), Schultz
patent: 2947513 (1960-08-01), Nolden et al.
patent: 3117764 (1964-01-01), Schultz et al.
patent: 3165295 (1965-01-01), Nolden
patent: 3647183 (1972-03-01), Rishovd
patent: 3768778 (1973-10-01), Ames
patent: 3869149 (1975-03-01), Dixon

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