Trunnion transportation system and crane using same

Details Trunnion transportation system and crane using same Trunnion transportation system and crane using same

2011-08-16

2011-08-16

Brahan, Thomas J. (Department: 3654)

Traversing hoists

Adjustable to transport or nonuse position

Vehicle stablizing means

C180S009480

Reexamination Certificate

active

07997432

ABSTRACT:
A mobile lift crane includes a carbody and at least four crawlers attached to the carbody, each crawler having a crawler frame attached to the carbody by a trunnion having an axis. The crawler frame is attached to the carbody so as to be able to pivot with respect to the carbody about the axis of the trunnion. The crane also includes a rotating bed rotatably connected to the carbody such that the rotating bed can swing with respect to the crawlers and a boom pivotally mounted on a front portion of the rotating bed. A linear actuator is connected between the crawler frame and the carbody and extends through the trunnion.The linear actuator is part of a self attachment mechanism. The trunnion includes a tubular member with a longitudinal axis, a first end configured for connection to the crane carbody and a second end configured for connection to the crawler frame. At least one of the ends is configured to allow rotational movement of the crawler frame relative to the carbody about the longitudinal axis. The linear actuator is mounted within the hollow central tubular member. The linear actuator is preferably a hydraulic cylinder. A carbody connector is attached to one end of the hydraulic cylinder, and a crawler frame connector is attached to the other end of the hydraulic cylinder.

REFERENCES:
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patent: 6848522 (2005-02-01), Moore et al.
patent: 6851494 (2005-02-01), Harthauser
Bucyrus-Erie 300-D brochure and pictures, including letter dated Jan. 23, 1978 and Preliminary Specification, 13 pgs total (1978).

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