Process for self-disassembling a crawler crane

• US 5,484,069 A
• Filed: 12/20/1993
• Issued: 01/16/1996
• Est. Priority Date: 09/20/1991
• Status: Expired due to Term

• Current Assignee: Manitowoc Cranes LLC (The Manitowoc Company, Inc.)
• Original Assignee: The Manitowoc Company, Inc.
• Inventors: Lanning, John M.
• Primary Examiner(s): Huppert, Michael S.
• Assistant Examiner(s): JOHNSON, RAYMOND B
• Application Number:
  US08/170,682
• Time in Patent Office: 757 Days
• Field of Search: 212/175-182, 212/186-188, 212/192-193, 212/211, 212/222, 212/227, 212/230-239, 212/255, 212/260, 212/262, 212/266, 414/607, 52/116
• US Class Current: 212/270
• CPC Class Codes: B66C 23/36 mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes with pneumatic or hydraulic motors B66C23/54; vehicle or ship aspects B60 - B63
• CPC Class Codes: B66C 23/62 Constructional features or details of dredgers E02F

Abstract

A method and apparatus for self-assembling and self-disassembling a large capacity crawler crane. The method uses the load hoist line of a crane to remove the equalizer from the boom. The method also uses a hydraulic cylinder to support, raise and lower the boom after the equalizer has been removed from the boom. Finally, the boom butt can be disassembled into several parts.

Claims

1. A process of disassembling a crane comprising a load hoist line, a boom, an equalizer, boom hoist rigging, and a hydraulic cylinder, said boom being supported by said equalizer and boom hoist rigging comprising the steps of:

a) disconnecting the equalizer from the boom;

b) connecting the load hoist line to the boom and the equalizer;

c) using the boom hoist rigging to move the equalizer to a storage position; and

d) using the hydraulic cylinder to support the boom at least some time during the step of moving the equalizer to the storage position.

2. The process of claim 1 wherein the equalizer remains connected to the boom hoist rigging after the crane has been disassembled for transport.

3. The process of claim 1 wherein said load hoist line is used to suspend said equalizer at some time during the step of moving said equalizer to said storage position.

4. The process of claim 1 wherein the boom comprises a boom butt and the step of disconnecting the equalizer in step a) comprises disconnecting the equalizer from the boom butt.

5. The process of claim 1 wherein the boom comprises a boom top and a boom butt and the step of disconnecting the equalizer in step a) comprises disconnecting the equalizer from the boom top, and the process further includes the intermediate step of connecting the equalizer to the boom butt.

6. The process of claim 1 wherein the crane further comprises a gantry and in step c) the equalizer in said storage position is stored on the gantry.

7. A process of disassembling a crane comprising pendants, an equalizer, boom hoist rigging, a gantry, a load hoist line, a boom, and a boom support means, said boom supported by said pendants which are connected between the boom and the equalizer which is connected to boom hoist rigging, wherein the process comprises the steps of:

a) connecting the load hoist line to the boom and the equalizer;

b) disconnecting the equalizer from the pendants;

c) using said boom hoist rigging to move the equalizer to a storage position on the gantry;

d) using said load hoist line to suspend the equalizer during the step of moving the equalizer to said storage position; and

e) supporting the boom by said boom support means during the step of moving the equalizer to said storage position.

8. The process of claim 7 wherein the boom comprises a boom butt, and the crane comprises other detachable components and after steps a) and b) the process comprises the steps of:

i) connecting the equalizer to the boom butt;

ii) disconnecting the load hoist line from the equalizer;

iii) using the boom hoist rigging and the equalizer to pivot the boom butt during removal of the other detachable crane components;

iv) reconnecting the load hoist line to the equalizer; and

v) disconnecting the equalizer from the boom butt.

9. The process of claim 7 wherein the boom support means is a hydraulic cylinder.

10. The process of claim 7 wherein the equalizer remains connected to the boom hoist rigging after the crane has been disassembled for transport.

11. A process of disassembling a crane comprising pendants, an equalizer, boom hoist rigging, a gantry, a load hoist line, a boom, and a boom positioning means, the boom being supported by said pendants, the pendants being connected between the boom and said equalizer, the equalizer being connected to said boom hoist rigging, wherein the process comprises the steps of:

a) connecting the load hoist line to the boom and the equalizer;

b) disconnecting the equalizer from the pendants;

c) using said boom positioning means to position the boom and the load hoist line such that the equalizer is suspended by the load hoist line; and

d) using said boom hoist rigging to move the equalizer to a storage position on the gantry.

12. The process of claim 11 wherein the boom positioning means is a hydraulic cylinder.

13. The process of claim 11 wherein the equalizer remains connected to the boom hoist rigging after the crane has been disassembled for transport.

14. The process of claim 11 wherein the boom comprises a boom butt and after step b) the process further includes the intermediate step of connecting the equalizer to the boom butt.

15. The process of claim 11 wherein the boom comprises a boom butt, and the crane comprises other detachable components and after steps a) and b) the process comprises the steps of:

i) connecting the equalizer to the boom butt;

ii) disconnecting the load hoist line from the equalizer;

iii) using the boom hoist rigging and the equalizer to pivot the boom butt during removal of the other detachable crane components;

iv) reconnecting the load hoist line to the equalizer; and

v) disconnecting the equalizer from the boom butt.