Method for raising raisable and lowerable member, and crane

• US 10,640,341 B2
• Filed: 03/19/2018
• Issued: 05/05/2020
• Est. Priority Date: 03/30/2017
• Status: Active Grant

• Current Assignee: Kobelco Construction Machinery Company Limited (Kobe Steel Limited)
• Original Assignee: Kobelco Construction Machinery Company Limited (Kobe Steel Limited)
• Inventors: Maedo, Teppei
• Primary Examiner(s): Mansen, Michael R
• Assistant Examiner(s): Campos, Jr., Juan J
• Application Number:
  US15/924,678
• Publication Number:
  US 20180282136A1
• Time in Patent Office: Days
• Field of Search: 212270
• CPC Class Codes: B66C 23/68 foldable or otherwise adjustable in configuration
• CPC Class Codes: B66C 23/82 Luffing gear

Abstract

A rope routing step and a raising step are executed. In the rope routing step, in a state where a raisable and lowerable member and a boom are laid down, a raising rope is coupled to the raisable and lowerable member and routed to extend rearward of the raisable and lowerable member. In the raising step, the raising rope is wound up rearward to raise the raisable and lowerable member. In the rope routing step, the raising rope is routed to pass between a lower restriction section and an upper restriction section of a rope support member, and in the raising step, the raising rope is wound up rearward with a vertical movement of the raising rope restricted by the upper restriction section and the lower restriction section.

Claims

1. A method for raising a raisable and lowerable member of a crane equipped with a machine body, a boom mounted to the machine body in a raisable and lowerable manner, and the raisable and lowerable member being raisable and lowerable with respect to the boom,

the method comprising:

a rope routing step of coupling a raising rope to the raisable and lowerable member, in a state where the raisable and lowerable member and the boom are laid down along an installation surface on which the crane is placed, the boom extending forward of the machine body in a front-rear direction of the boom, and the raisable and lowerable member extending forward of the boom in the front-rear direction of the boom, and routing the raising rope to let the raising rope extend rearward of the raisable and lowerable member in the front-rear direction of the boom; and

a raising step of winding up the raising rope rearward in the front-rear direction of the boom to raise the raisable and lowerable member with respect to the boom, the raising step being executed after the rope routing step,

wherein

in the rope routing step, the raising rope is routed to pass between an upper restriction section and a lower restriction section of a rope support member attached to the boom, the lower restriction section being disposed at a position closer to the boom than the raising rope to support the raising rope at a position above an upper surface of the boom while allowing a movement of the raising rope in the front-rear direction of the boom, the upper restriction section being disposed at a position farther away from the boom than the raising rope to be contactable with the raising rope, and

in the raising step, the raising rope is wound up rearward in the front-rear direction of the boom, while the upper restriction section restricts an upward movement of the raising rope and the lower restriction section restricts a downward movement of the raising rope.

3. The method for raising a raisable and lowerable member according to claim 1, wherein

the lower restriction section includes a rotary body rotatable about an axis orthogonal to the front-rear direction of the boom and extending along the installation surface, and

in the raising step, the raising rope is wound up rearward in the front-rear direction of the boom, while the rotary body supports the raising rope on an outer peripheral surface of the rotary body and rotates with the rearward movement of the raising rope.

2. A method for raising a raisable and lowerable member of a crane equipped with a machine body, a boom mounted to the machine body in a raisable and lowerable manner, the raisable and lowerable member being raisable and lowerable with respect to the boom, a support member that supports the boom and is raisable and lowerable with respect to the machine body, and a connection member for connecting a distal end of the boom and a distal end of the support member,

the method comprising:

a support member raising step of raising the support member with respect to the machine body rearward of the boom in the front-rear direction of the boom, in a state where the raisable and lowerable member and the boom are laid down along an installation surface on which the crane is placed, the raisable and lowerable member extending forward of the boom in a front-rear direction of the boom, such that the connection member obliquely extends forward and downward from the distal end of the support member toward the distal end of the boom;

a rope routing step of coupling a raising rope to the raisable and lowerable member, and routing the raising rope to extend rearward of the raisable and lowerable member in the front-rear direction of the boom; and

a raising step of winding up the raising rope rearward in the front-rear direction of the boom to raise the raisable and lowerable member with respect to the boom, the raising step being executed after the support member raising step and the rope routing step,

wherein

in the rope routing step, the raising rope is routed to pass between an upper restriction section and a lower restriction section of a rope support member attached to the boom, the lower restriction section being disposed at a position closer to the boom than the raising rope to support the raising rope at a position above an upper surface of the boom while allowing a movement of the raising rope in the front-rear direction of the boom, the upper restriction section being disposed at a position farther away from the boom than the raising rope to be contactable with the raising rope, and

in the raising step, the raising rope is wound up rearward in the front-rear direction of the boom, an upward movement of the raising rope being restricted by the upper restriction section, a downward movement of the raising rope being restricted by the lower restriction section.

4. The method for raising a raisable and lowerable member according to claim 2, wherein

the lower restriction section includes a rotary body rotatable about an axis orthogonal to the front-rear direction of the boom and extending along the installation surface, and

in the raising step, the raising rope is wound up rearward in the front-rear direction of the boom, while the rotary body supports the raising rope on an outer peripheral surface of the rotary body and rotates with the rearward movement of the raising rope.