Crane

Patent metadata

Field	Value
Publication number	US-10519010-B2
Application number	US-201515325452-A
Country	US
Kind code	B2
Filing date	Jul 23, 2015
Priority date	Jul 29, 2014
Publication date	Dec 31, 2019
Grant date	Dec 31, 2019

Abstract

A crane includes a boom and a derricking mechanism, wherein: the derricking mechanism includes a linking device connecting one end of a guy line to a distal end of the boom; the linking device includes a joint connected to one end of the guy line, and a support device provided on the distal end to support the joint so as to locate the joint at a position away from the back surface and opposite to the ventral surface; and the support device includes a holding member which holds the joint, the holding member allowing the position of the joint to be selectively changed to a plurality of different positions in a first direction perpendicularly intersecting an axis of the boom and a rotary axis of the boom.

First claim

The invention claimed is:

1. A crane, comprising:
a machine body;
a boom rotatably mounted on the machine body and having a structure which allows the length of the boom to be changed; and
a derricking mechanism configured to rotate the boom to raise and lower the boom with respect to the machine body, wherein:
the derricking mechanism includes
a guy line,
a linking device provided on a distal end of the boom to connect one end of the guy line to the distal end of the boom, and
a guy line operating device configured to draw the guy line rearward to raise the boom and configured to advance the guy line to lower the boom;

the distal end of the boom has a back surface which faces rearward when the boom is in a vertical position, and a ventral surface which faces forward when the boom is in the vertical position;
the linking device includes
a joint connected to the one end of the guy line, and
a support device provided on the distal end to support the joint so as to locate the joint at a position away from the back surface and opposite to the ventral surface; and

the support device includes:
an attachment section fixedly provided on the distal end of the boom;
a holding member which holds the joint;
a supporting member which holds the holding member, and
the holding member and the supporting member are rotatably attached to the attachment section,
the holding member includes a plurality of holding parts respectively disposed at different positions in a first direction perpendicularly intersecting an axis of the boom and a rotary axis of the boom and the holding member, allowing the position of the joint to be selectively changed to the plurality of different positions in the first direction by the plurality of holding parts.

2. The crane according to claim 1 , wherein
each of the holding parts is configured to detachably hold the joint.

3. The crane according to claim 1 , wherein
the supporting member is disposed between the holding member and the back surface of the distal end, and
the supporting member is coupled with the joint held by the holding member to support the holding member at the position of the joint via the joint.

4. A crane, comprising:
a machine body;
a boom rotatably mounted on the machine body and having a structure which allows the length of the boom to be changed; and
a derricking mechanism configured to rotate the boom to raise and lower the boom with respect to the machine body, wherein:
the derricking mechanism includes
a guy line,
a linking device provided on a distal end of the boom to connect one end of the guy line to the distal end of the boom, and
a guy line operating device configured to draw the guy line rearward to raise the boom and configured to advance the guy line to lower the boom;

the distal end of the boom has a back surface which faces rearward when the boom is in a vertical position, and a ventral surface which faces forward when the boom is in the vertical position;
the linking device includes
a joint connected to the one end of the guy line, and
a support device provided on the distal end to support the joint so as to locate the joint at a position away from the back surface and opposite to the ventral surface; and

the support device includes a holding member which holds the joint, the holding member allowing the position of the joint to be selectively changed to a plurality of different positions in a first direction perpendicularly intersecting an axis of the boom and a rotary axis of the boom,
wherein
the guy line operating device includes
a first mast rotatably mounted on the machine body at a position behind the boom,
a second mast disposed between the boom and the first mast and rotatably mounted on the machine body, the second mast including a distal end connected to an opposite end of the guy line, the opposite end being an end opposite to the one end,
a connecting member connecting a distal end of the first mast and the distal end of the second mast, and
a mast rotating device configured to rotate the first mast to rotate the second mast via the connecting member to draw the guy line rearward or advance the guy line;

the distal end of the second mast lies at a higher level than the distal end of the first mast; and
the support device includes an attachment section which is disposed at the distal end of the boom and to which the holding member is attached, the attachment section allowing the position of the holding member to be selectively changed to a plurality of different positions in a second direction along the axis of the boom.

5. The crane according to claim 4 , wherein
the attachment section includes a plurality of attachment members respectively disposed at the different positions in the second direction in the distal end of the boom, each of the plurality of the attachment members being attachable to and detachable from the holding member.

Assignees

• Kobelco Constr Mach Co Ltd

Inventors

• Miyazaki Kazuyuki
• Kurihara Shingo

Classifications

• B66C23/82

  Luffing gear · CPC title

• B66C23/66 Primary

  Outer or upper end constructions · CPC title

• B66C23/62

  Constructional features or details (of dredgers E02F) · CPC title

• B66C23/72

  Counterweights or supports for balancing lifting couples · CPC title

• B66C23/60 Primary

  Derricks · CPC title