Material or article handling – Elevator or hoist and loading or unloading means therefor – Convertible attachment
Patent
1998-07-22
2000-02-08
Kramer, Dean J.
Material or article handling
Elevator or hoist and loading or unloading means therefor
Convertible attachment
414608, 414910, 414911, 187234, 187274, B66F 922
Patent
active
060221836
ABSTRACT:
A mobile machine for lifting massive objects which includes a primary hydraulic cylinder whose piston chamber is hydraulically connected on a high pressure end thereof to a high pressure end of one or more secondary hydraulic lifting cylinders for operation of the lifting cylinder(s) in unison to lift the object. The total maximum effective volume of the piston chamber(s) of the secondary cylinder(s) is at least equal to the maximum effective volume of the piston chamber of the primary cylinder. The sum total effective cross-sectional area of all of the secondary cylinder piston chambers is greater than the corresponding cross-sectional area of the primary cylinder chamber to provide an output lifting force of the secondary cylinder(s) which is greater than the input force applied to a piston rod of the primary cylinder necessary to transfer hydraulic fluid from the primary cylinder to the secondary cylinder(s) to produce the enhanced output lifting force. A second embodiment of the invention permits repetitive operation of the primary cylinder to produce lifting of the secondary cylinder(s) in stages to permit use of one or more secondary cylinders having substantially greater lifting stroke distance than is possible using the preferred embodiment and, thus, increase the height to which the object can be lifted.
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Brooks Kelley R.
Walters James C.
Kramer Dean J.
Miller Jr. Maurice L.
Steel Technologies, Inc.
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