Mobile crane comprising a telescopic boom

Details Mobile crane comprising a telescopic boom Mobile crane comprising a telescopic boom

1989-03-23

1990-12-11

Peters, Jr., Joseph F.

Traversing hoists

Having horizontally swinging boom or bridge

Extensible by movement of boom or boom segment along...

212182, 212244, B66C 2304, B66C 2326

Patent

active

049763610

ABSTRACT:
A mobile crane is disclosed which comprises a telescopic boom, which is pivoted to the rotating superstructure or rotating deck of the crane and is adapted to be luffed by a luffing cylinder, which is pivoted to the boom and the rotating deck. A guying yoke is pivoted on the rear of the telescopic boom near the middle of its base box. Two axially aligned spaced apart rope pulleys are rotatably mounted at the outer end of the guying yoke. A reversing rope pulley is provided adjacent to the top end of the telescopic boom. Also, a winch is provided with a rope, which serves to guy the telescopic boom and extends around one rope pulley of the guying yoke to the upper reversing rope pulley and back around the other rope pulley of the guying yoke to a fixed point. The winch and the point to which the rope is fixed are disposed on mutually opposite sides of the telescopic boom adjacent to the pivotal axis of the boom. The guying yoke is restrained by a hydraulic piston-cylinder unit, which is pivoted at one end to the guying yoke above the pivotal axis of the latter and is pivoted at the other end to the base box near the middle thereof between the pivotal axes of the guying yoke and the telescopic boom.

REFERENCES:
patent: 2895623 (1959-07-01), Urbanowicz
patent: 3792781 (1974-02-01), Blase et al.
patent: 4049238 (1977-09-01), Brown
patent: 4460098 (1984-07-01), Scherman
patent: 4492312 (1985-01-01), Poock

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