ANGLE ADJUSTMENT OF A JIB SYSTEM

• US 20100294738A1
• Filed: 05/24/2010
• Published: 11/25/2010
• Est. Priority Date: 05/22/2009
• Status: Active Grant

• Current Assignee: Tadano Demag GmbH (Tadano Limited)
• Original Assignee: Terex Demag GmbH (Tadano Limited)
• Inventors: MARTIN, Michael
• Granted Patent: US 8,640,896 B2
• Time in Patent Office: Days
• US Class Current: 212/347
• CPC Class Codes: B66C 23/344 adapted for transport purposes
• CPC Class Codes: B66C 23/68 foldable or otherwise adjustable in configuration

Abstract

Method for adjusting the angle of a jib system of a crane, comprising the steps of providing two jib units of the jib system, which can be variably arranged with respect to their longitudinal axes in an angle position in relation to one another, arranging connecting links attached to the jib units in such a way that the longitudinal axes of the jib units are parallel in a starting angle position, starting openings and target openings of the connecting links are aligned with one another pairwise to insert a connecting element connecting the jib units, the aligned starting openings being connected with the connecting element, relieving the connecting element connecting the aligned starting openings, removing the first connecting element, connecting a pair of the aligned target openings with the connecting element, and arranging the jib units in a target angle position which is different from the starting angle position.

Claims

1. A method for adjusting the angle of a jib system (1) of a crane, comprising the steps

providing two jib units (3, 4) of the jib system (1), which can be variably arranged with respect to their longitudinal axes (13, 13a) in an angle position in relation to one another,

arranging connecting links (8, 8a;

29, 29a) attached to the jib units (3, 4) in such a way that the longitudinal axes (13, 13a) of the jib units (3, 4) are parallel in a starting angle position, starting openings (10) and target openings (11, 12) of the connecting links (8, 8a;

29, 29a) are aligned with one another pairwise to insert a connecting element (20;

30) connecting the jib units (3, 4), the aligned starting openings (10) being connected with the connecting element (20;

30),

relieving the connecting element (20;

30) connecting the aligned starting openings (10),

removing the first connecting element (20;

30),

connecting a pair of the aligned target openings (11;

12) with the connecting element (20;

30), and

arranging the jib units (3, 4) in a target angle position which is different from the starting angle position.

2. A method according to claim 1, wherein the jib units (3, 4) are arranged in one of two possible target angle positions, by connecting a pair of the aligned target openings (11;

12).

3. A method according to claim 1, wherein the jib units (3, 4) are arranged in one of a group of a 20°

position and a 40°

position, by connecting a pair of the aligned target openings (11;

12).

4. A method according to claim 1, comprising adjusting the angle of the jib units (3, 4) by pivoting about a common pivoting unit (2).

5. A method according to claim 1, wherein it is possible to change the connecting element (20;

30) by hand.

6. A method according to claim 1, wherein the relieving of the connecting element (20;

30) takes place by lifting or supporting the jib unit (3) to be angled.

7. An angle-adjustable jib system (1) of a crane, wherein

the jib system (1) has two jib units (3, 4) connected to one another each with a longitudinal axis (13;

13a),

connecting links (8;

8a;

29, 29a) are provided for the angle-adjustable connection of the jib units (3, 4),

each connecting link (8, 8a;

29, 29a) has two legs (17, 18), which are arranged at an angle to one another,

the first leg (17) has a starting opening (10) to connect the connecting links (8, 8a;

29, 29a) in a starting angle position and

the second leg (18) has a plurality of target openings (11, 12) to connect the connecting links (8, 8a;

29, 29a) in various target angle positions,

wherein in the starting angle position, the longitudinal axes (13, 13a) of the jib units (3, 4) are parallel, the openings (10, 11, 12) of the two legs (17, 18) are aligned with one another pairwise to insert a connecting element (20;

30) connecting the jib units (3, 4) and the starting openings (10) are connected with the connecting element (20;

30).

8. A jib system according to claim 7, wherein the second leg (18) has two target openings (11, 12).

9. A jib system according to claim 7, wherein a spacing (A1) of the starting opening (10) from the vertex opening (9) is smaller than spacings (A2, A3) of the target openings (11, 12) from the vertex opening (9).

10. A jib system according to claim 7, wherein the angle arrangement of the legs (17, 18) in relation to one another is variable.

11. A jib system according to claim 7, wherein the connecting links (8, 8a;

29, 29a) have a plurality of plates (21), which are arranged parallel to one another and spaced apart in the direction of the connecting element (20;

30).

12. A jib system according to claim 7, wherein at least one jib unit (3, 4) is a lattice boom.

13. A jib system according to claim 7, wherein one jib unit (3, 4) is a telescopic jib head.

14. A jib system according to claim 7, wherein an extension (A4) parallel to the longitudinal axes (13, 13a) in the starting angle position is smaller than a permissible maximum value.

15. A jib system according to claim 7, wherein at least one connecting link (8;

8a;

29, 29a) has a stop (22;

33) for resting in the starting angle position on a fork head (28) of the respective jib unit (3, 4) arranged opposing.

16. A crane with a jib system according to claim 7.