US 4,053,060 AGranted

Crane

OwnerVirgil D. Wilsoninventor

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Abstract

A mobile rotary crane that can easily be moved on site while assembled, transported on the highway when disassembled, and lift large loads with a full range of movement. A vehicular support supports a crane base for rotary movement with respect thereto, the vehicular support having a pair of end sections with multiple axle wheel trains pivotally mounted with respect thereto. A center section of the vehicular support includes outrigger means for providing a wide base of support during lifting with the crane. A main boom section is pivotally mounted to the crane base, and lever arms disposed at right angles with respect to the main boom and mounted on a common center therewith provide for lifting of the main boom from a generally horizontal position, whereat any number of sections comprising the main boom may be attached together, to its generally vertical operating position. A jib boom is pivotally mounted on the load side of the main boom, and counterweight is disposed on the crane base on the opposite side of the main boom as the jib boom. A tower that is at least 1/3 the length of the jib boom, extends from the main boom, and provides support for the cable assembly for pivoting the jib boom with respect to the main boom. A reeving assembly extends on the load side of the tower, associated with cable extending between the tower and the jib boom, and a strongback assembly is provided on the counterweight side of the main boom.

Claims28

Dependent claims

A mobile rotary crane comprising

a. a mobile vehicular support,
b. a crane base,
c. means for rotating said crane base with respect to said vehicular support with said vehicular support in a stationary position,
d. a main boom pivotally mounted with respect to said crane base for pivotal movement in a vertical plane about a first horizontal axis from a generally horizontal position to a generally vertical position, said main boom having a free end,
e. means for mounting counterweight on said base on one side of said main boom, said main boom extending away from said counterweight when in said generally horizontal position thereof,
f. a jib boom pivotally mounted to said main boom at a portion thereof near the free end thereof for rotation about a second horizontal axis and located on the load side of said main boom, opposite the counterweight side thereof, said jib boom having a free end,
g. a tower extending from said main boom free end and providing a substantial continuation of said main boom,
h. a first cable connected to the free end of said jib boom, extending over said tower, and to a drive assembly on said crane base, said drive assembly for letting out and pulling in said cable to pivot said jib boom with respect to said tower and said main boom,
i. a lever arm pivotally mounted to said crane base for pivotal movement in a vertical plane about said first axis, said lever arm extending generally perpendicularly to said main boom toward the counterweight side, and operatively attached to said main boom, and having a free end with a pulley attached thereto, and
j. a second cable extending from a portion of said main boom adjacent the free end thereof around said pulley and to a drive assembly, said drive assembly for letting out and pulling in said second cable to pivot said main boom and said lever arm about said first axis to any position between said generally horizontal and generally vertical position of said main boom.

7 more elements

A mobile rotary crane comprising

a. a mobile vehicular support including a center section and a pair of end sections,
b. a crane base rotatably mounted on the center section of said mobile vehicular support,
c. a pair of multiple axle wheel trains, at least some of the wheels of each train being steerable,
d. means formounting one of said multiple axle wheel trains to each of said end sections for pivotal movement about a vertical axis so that said wheel train axles are movable from a position perpendicular to the direction of elongations of said vehicular support to a position parallel thereto,
e. power means for driving at least some of the axles of one of said multiple axle wheel trains,
f. a main boom pivotally mounted to said crane base for rotation about a mounted axis and a jib boom pivotally mounted to said main boom on the load side thereof,
g. means for supporting counterweight on said crane base on the side of said main boom opposite the load side thereof, and
h. means for rotating said said crane base with respect to said vehicular support, and
i. said crane base comprising a pair of parallel spaced beams extending from the load side of said main boom to the counterweight side of said main boom, and a cross-beam extending substantially perpendicular to and intersecting said beams, said cross-beam extending in the same vertical plane as said horizontal axis, and said main boom pivotally mounted to said beams at the areas of intersection of said beams with said cross-beam, each of said beams extending a shorter distance on the load side of said main boom from said main boom than on the counterweight side of said main boom from said main boom.

6 more elements

Dependencies are inferred from the claim text.