Auxiliary Device for Installing the Lower and Upper Jib Support of an Adjustable Auxiliary Boom on a Mobile Crane
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Abstract
A device for installing the lower and upper jib support of an adjustable auxiliary boom.
The device includes
- a setup frame which is connected to the lower jib support
- a tie rod section one end of which can be connected to the hoist cable of the main hoisting gear whereas the other end is hinged to the top of the lower jib support
and
- a tensile member section between the lower jib support and the upper jib support.
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Citations
25 Claims
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1-10. -10. (canceled)
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11. An auxiliary device for installing an upper jib support and a lower jib support of an adjustable auxiliary boom that is mounted on a head of a main boom of a mobile crane, the auxiliary device comprising:
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a setup frame coupled to the lower jib support; a tie rod section, the tie rod section having a first end coupled a hoist cable of a main hoisting gear of the main boom and a second end coupled to the lower jib support the setup frame interacting with the tie rod section during winding of the hoist cable on the main hoisting gear to facilitate lifting of the lower jib support from the auxiliary boom during setup of the auxiliary boom; and a tensile member section coupled between the lower jib support and the upper jib support. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 21, 22, 23, 24, 25)
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20. A method for setting up an auxiliary boom, which is mounted on the head of the main boom of a mobile crane, the method comprising:
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unwinding a hoist cable from a main hoisting gear of the mobile crane; coupling the hoist cable to an end of a tie rod section that is opposite an end of the tie rod section coupled to the lower jib support; winding the hoist cable on the main hoisting gear of the mobile crane; straightening of a setup frame in response to the winding of the hoist cable; raising the lower jib support by tightening the tie rod section, first on a hoist side of a setup frame, then on an opposite side of the setup frame; tightening a tensile member section coupled between an upper and the lower jib supports in response to the continued winding of the hoist cable, wherein the tie rod section arrives in its end position in front of the main hoisting gear and the upper and lower jib supports are in their respective raised end positions.
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Specification