METHOD AND DEVICE FOR ATTACHING AND REMOVING AN ADDITIONAL DEVICE TO AND FROM THE MAIN JIB OF A MOBILE CRANE

• US 20100213152A1
• Filed: 02/25/2010
• Published: 08/26/2010
• Est. Priority Date: 02/26/2009
• Status: Active Grant

• Current Assignee: Tadano Demag GmbH (Tadano Limited)
• Original Assignee: Terex Demag GmbH (Tadano Limited)
• Inventors: Kuhn, Roland, Biwer, Udo, Martin, Michael
• Granted Patent: US 8,739,987 B2
• Time in Patent Office: Days
• US Class Current: 212/177
• CPC Class Codes: B66C 23/18 specially adapted for use in particular purposes
• CPC Class Codes: B66C 23/42 with jibs of adjustable configuration, e.g. foldable
• CPC Class Codes: B66C 23/66 Outer or upper end constructions
• CPC Class Codes: B66C 23/702 with a jib extension boom
• CPC Class Codes: Y10T 29/49963 Threaded fastener

Abstract

The invention relates to a method and to a device for attaching and removing an additional device comprising individual elements to and from the main jib of a mobile crane using no auxiliary crane. In the method according to the invention, a partial piece (2.1) of the additional device (2) composed of partial pieces is raised into an inclined position while being rotated about an upper pivot point (C), and the head (1.2) of the main jib (1.1) is bolted to the lower end of the inclined end of the partial piece (2.1) of the additional device (2) facing the mobile crane so as to be able to rotate. Using a hoist cable (7), all partial pieces (2.1 to 2.7) are raised in alignment with respect to each other and the main jib (1.1), and are bolted to each other in this position and to the main jib. The invention furthermore relates to a displacement device for carrying out the method according to the invention.

Claims

1. A method for attaching and removing an additional device to and from the main jib of a mobile crane using no auxiliary crane,

comprising:

placing the additional device (2) on the ground in alignment with the main jib (1.1) of the mobile crane (1);

raising a partial piece (2.1), at the end of the additional device (2) facing the mobile crane, into an inclined position while being rotated about an upper pivot point;

holding the raised partial piece in the inclined position;

bolting the head (1.2) of the main jib (1.1) to the lower end of the inclined end of the partial piece (2.1) of the additional device (2) facing the mobile crane so that the raised partial piece is rotatable relative to the additional device;

pulling the additional device (2) into a horizontal position using a hoist cable (6) fastened to an end of the partial piece (2.1) facing away from the mobile crane (1) and guided over a roller (2.8), such that the partial piece (2.1) of the additional device (2 and the main jib (1.1) of the mobile crane are aligned behind one another in orientation; and

connecting the preassembled additional device to the head (1.2) of the main jib (1.1).

2. The method according to claim 1, wherein

the additional device (2) has a multi-piece lattice/pipe design, of transportable dimensions.

3. The method according to claim 1,

further comprising;

raising the additional device (2), at the end facing away from the mobile crane (1) such that a second partial piece (2.7) of the additional device (2), that is rotatable about a lower pivot point (E), assumes an inclined position and the second partial piece (2.7) assumes an inclined position with an end of the partial piece (2.7) maintaining contact with the ground prior to raising the partial piece (2.1) of the additional device (2);

raising the partial piece (2.1) of the additional device (2) facing the mobile crane (1);

raising the inclined second partial piece (2.7) of the additional device (2), located at the end facing away from the mobile crane, by pulling a lifting cable that is fastened to a head point (H) of the second partial piece (2.7) of the additional device (2) such that the partial pieces (2.1, 2.7) of the additional device (2), the additional device, and the main jib (1.1) of the mobile crane (1) are aligned behind one another in orientation, and

connecting the components (2, 2.1 and 2.7) to each other and to the head (1.2) of the main jib (1.1).

4. A method according to claim 1, wherein

the temporary inclined position of the partial pieces (2.1) of the additional device (2) is secured by a spacer rod (5).

5. The method according to claim 1, further comprising

placing the end of the additional device (2) facing the mobile crane (1) onto a displacement device (4), configured to transversely displace the longitudinal axis of the additional device (2), into an aligned orientation of the additional device (2) with respect to the jib (1.1) of the mobile crane (1).

6. A method according to claim 3, wherein

the raising and inclining of the first and second partial pieces (2.1, 2.7) of the additional device (2) is carried out using a hoist cable of the mobile crane (1).

7. A method according to claim 3, wherein

the raising and inclining of the first and second partial pieces (2.1, 2.7) of the additional device (2) is carried out using a lifting cylinder.

8. An additional device for attachment to the main jib of a mobile crane, comprising:

a partial piece (2.1), disposed at an end of the additional device (2) facing the mobile crane (1), having a hinge (C) operable to angle the partial piece (2.1) relative to the additional device (2);

a roller (2.8) for guiding a hoist cable is fastened to the partial piece (2.1);

fastening elements (A, B2, C, D1, D2) located on the partial piece (2.1), for fastening of a spacer rod (5) to maintain the angled state of the partial piece (2.1) of the additional device (2), and for fastening the partial piece (2.1) to an adjoining part (2.2) of the additional device (2) and to a head (1.2) of the main jib (1.1) of the mobile crane (1).

9. The additional device according to claim 8,

further comprising:

a second partial piece (2.7) disposed at the end of the additional device (2) facing away from the mobile crane (1) having a hinge (C) disposed at a first end of the second partial piece and operable to angle the second partial piece (2.7) relative to the additional device (2);

a roller (2.10) for guiding a lifting cable fastened to the second partial piece (2.7) and having fastening elements (F1, F2) configured to fasten a spacer rod (6) to maintain the second partial piece (2.7) in an angled state relative to the additional device (2), and configured to fasten the second partial piece (2.7) to an adjoining part (2.6) of the additional device (2) such that an aligned state of the parts of the additional device (2) is facilitated; and

a wheel (2.9) disposed at a second, opposite end of the second partial piece (2.7) of the additional device.

10. A displacement device for displacing an additional device transversely to its longitudinal axis, comprising:

a principal beam (4.1) defining a sliding plane;

threaded feet supporting the principal beam (4.1) and configured to adjust the vertical height of the beam;

sliding pieces (4.2) carrying the additional device (2) disposed on the beam and configured to displace the additional device transversely;

a cylinder carrier (4.4) fastened to the principal beam (4.1) and having a lifting cylinder (4.3) including a lifting rod configured to displace the sliding pieces (4.2) on a sliding plane of the principal beam (4.1).