Heavy duty crane with self-retracting/erecting live mast

Details Heavy duty crane with self-retracting/erecting live mast Heavy duty crane with self-retracting/erecting live mast

1990-06-04

1993-08-31

Peters, Jr., Joseph F.

Traversing hoists

Having means facilitating assembly or disassembly

212177, 212186, 212188, 212233, B66C 2300

Patent

active

052401294

ABSTRACT:
A traveling crane incorporates a self-retracting/erecting live mast or the like, pivotally mounted on the base unit and capable of moving to and from a flipped, stowed position on the opposite side of vertical from the positions of the normal operating mode. A cable and winch is provided to raise and lower the mast during the normal operating mode and to move the mast toward the stowed position. A power cylinder operates to control the mast during retraction and to erect the mast from the stowed position. A control system operates the power cylinder to controllably move the mast during retraction/erection. Flexible pendants and telescopic guide links interconnect the cylinder with the mast and the base unit. Optimum operating angles are provided. The control system includes an electrical circuit and a hydraulic circuit, the hydraulic circuit having a restricted orifice to resist movement of the mast by gravity during retraction. The electrical circuit includes interlocks to disable the cable and winch at a selected angle and to place the cylinder in a free float mode during normal crane operation. The method includes the steps of pivotally moving the mast with the cable and winch, engaging the mast by the power cylinder during retraction/erection and counterbalance controlling the mast movement.

REFERENCES:
patent: 2740535 (1956-04-01), Bill
patent: 2786580 (1957-03-01), Balogh
patent: 2828064 (1958-06-01), Brown
patent: 2838182 (1958-06-01), Brown
patent: 2897979 (1959-08-01), Holan et al.
patent: 3071255 (1963-01-01), Bill
patent: 3146893 (1964-09-01), Eckels et al.
patent: 3664516 (1972-05-01), Goudy
patent: 3769375 (1973-01-01), Morrison et al.
patent: 3842983 (1974-10-01), Dolza
patent: 4053058 (1977-10-01), Jensen et al.
patent: 4081081 (1978-03-01), Morrow, Sr. et al.
patent: 4352434 (1982-10-01), Poock
patent: 4467928 (1984-08-01), White
patent: 4492312 (1985-01-01), Poock
patent: 4579234 (1986-04-01), Delago et al.

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