JP7735792B2 - crane - Google Patents

Description

This disclosure relates to a crane.

Patent Document 1 discloses a crane that includes a lower running body, an upper rotating body rotatably supported on the lower running body, a boom supported on the upper rotating body so that it can be raised and lowered, a jib supported at the tip of the boom, a strut, and a strut guy line stretched between the strut and the boom. In conventional cranes such as the one disclosed in Patent Document 1, the connecting link at one end of the strut guy line, which is connected to the boom, is connected to a section located at the top of the boom when the boom and jib are positioned in a lowered position (hereinafter, this section will be referred to as the "upper section when lowered").

When transporting a crane, it is disassembled into multiple parts and then assembled at the destination. Crane assembly work includes strut guy line connection work, which is the work of connecting the strut guy lines to the boom. Crane disassembly work includes strut guy line removal work, which is the work of removing the strut guy lines from the boom. Both the strut guy line connection work and the strut guy line removal work are performed with the boom and jib in a lowered position.

Japanese Patent Application Laid-Open No. 2019-099352

When connecting or removing strut guy lines, workers must climb up to or descend from the upper part of the boom when it is lowered, while the boom and jib are in the lowered position. This takes time. Furthermore, because the connection link of the strut guy line is heavy, it takes a long time to use an auxiliary crane to move the connection link to a high position corresponding to the upper part of the boom when it is lowered.

This disclosure was made in consideration of the above-mentioned problems, and aims to provide a crane that can improve the workability of strut guy line connection and removal operations.

the boom is supported on the boom body so as to be able to be raised and lowered, the boom having a first boom member and a second boom member arranged side by side in the longitudinal direction of the boom, a plurality of connectors connecting the first boom member and the second boom member, and a plurality of connecting pins inserted into the pin holes of the plurality of connectors; a jib supported on the boom, the jib having a base end attached to the tip end of the boom; a strut supported on the tip end of the boom or the base end of the jib; and guy lines stretched between the struts and a lower-lower ...

With this crane, the boom-side connection of the strut guy line is attached to a special connecting pin that is located at the bottom of the boom when the boom and jib are in their lowered position, corresponding to the lower portion of the boom when lowered. Therefore, when connecting or removing strut guy lines, it is not necessary for the operator to climb up to or descend from the upper portion of the boom when lowered when the boom and jib are in their lowered position. In other words, the operator can connect or remove the strut guy line near the lower portion of the boom when lowered. This shortens the time required for connecting or removing strut guy lines compared to conventional methods. It also eliminates the need to use an auxiliary crane to move the boom-side connection to a higher position corresponding to the upper portion of the boom when lowered. This crane therefore improves the operability of connecting or removing strut guy lines.

The boom-side connection portion of the strut guy line is preferably positioned adjacent to the specific connector on the outer side of the boom in the width direction. In this configuration, the boom-side connection portion of the strut guy line is positioned on the outer side of the specific connector in the width direction of the boom, and the strut guy line can be extended from that position toward the strut, making it easier to avoid the strut guy line interfering with the boom.

The crane preferably further comprises a support member supported on the machine body and a boom guy line extending from the tip of the boom toward the support member, the strut guy line having a strut-side connection portion at the end opposite the boom-side connection portion and connected to the strut, the strut having a strut body including a support column extending from the tip of the boom or the base end of the jib, and a link member supported by the strut body, the link member enabling the strut-side connection portion to be positioned further outward in the boom width direction than the support column. This configuration makes it easier to avoid interference between the strut guy line and the boom guy line.

This disclosure provides a crane that can improve the workability of strut guy line connection and strut guy line removal operations.

FIG. 1 is a side view of a crane according to an embodiment of the present disclosure. FIG. 2 is a perspective view showing a boom, a jib, a strut, and a strut guy line of the crane. FIG. 2 is a top view of the boom, the jib, the struts, and the strut guy lines of the crane. FIG. 10 is a diagram showing a connection structure that connects the end of the strut guy line to the boom, the connection structure being viewed from above. FIG. 3 is a side view of the connection structure. 10A and 10B are plan views showing two types of connecting pins. FIG. 10 is a perspective view showing a connection structure for connecting an end of a strut guy line to a boom in a crane according to a modified example of the embodiment, the connection structure being viewed obliquely from above. FIG. 10 is a view of the connection structure in the crane according to the modified example, viewed obliquely from below. FIG. 6 is a cross-sectional view of the connection structure in the crane according to the modified example. FIG. 10 is a perspective view showing a connecting pin used in the connection structure of the crane according to the modified example.

The crane according to an embodiment of the present disclosure will be described below with reference to the drawings.

As shown in Figures 1 to 3, the crane 100 comprises a self-propelled lower running body 1, an upper rotating body 2 mounted on the lower running body 1 so as to be rotatable about a vertical axis relative to the lower running body 1, and a hoisting member supported on the upper rotating body 2 so as to be able to be raised and lowered relative to the upper rotating body 2. The hoisting member comprises a boom 3 and a jib 4. The lower running body 1 comprises a pair of crawler traveling devices and a lower frame supported by the traveling devices. The upper rotating body 2 comprises an upper frame rotatably supported on the lower frame, a cabin supported on the front of the upper frame, and a counterweight supported on the rear of the upper frame. The lower running body 1 and upper rotating body 2 are examples of a machine body. The crane 100 of this embodiment is a so-called fixed jib crane. In a fixed jib specification, the jib 4 is attached to the boom 3 with the angle of the jib 4 relative to the boom 3 fixed. Note that "front," "rear," "right," and "left" in the diagram are based on the orientation of the upper rotating body 2.

The boom 3 comprises a boom base end (boom foot), which is a base end supported by the upper rotating body 2 so as to be rotatable around a rotation center axis extending in the left-right direction, and a boom tip end, which is a tip end located on the opposite side of the boom 3 from the boom base end in the longitudinal direction. The boom 3 comprises multiple boom members. The boom 3 has a structure in which multiple boom members are arranged and connected in a line in the longitudinal direction of the boom 3.

Specifically, in this embodiment, the multiple boom members include a lower boom member 3A including the boom base end, multiple intermediate boom members 3B and 3C, and an upper boom member 3D including the boom tip. The lower boom member 3A, intermediate boom member 3B, intermediate boom member 3C, and upper boom member 3D are arranged in this order along the longitudinal direction of the boom 3. The intermediate boom member 3C has a tapered shape such that its width decreases toward the boom tip of the boom 3. Guide sheaves S1 and S2 and a boom point sheave S3 are rotatably attached to the upper boom member 3D. The multiple boom members do not necessarily have to include multiple intermediate boom members. Also, there may be only one intermediate boom member, or they may be omitted. The intermediate boom member 3B is an example of a first boom member, and the intermediate boom member 3C is an example of a second boom member.

The boom 3 is a so-called lattice boom, and at least one of the multiple boom members is a so-called lattice structure. Specifically, as shown in Figures 2 and 3, for example, each of the intermediate boom members 3B and 3C includes four main pipes 31, multiple inclined pipes 32, and multiple lateral pipes 33.

In each of the intermediate boom members 3B and 3C, the four main pipes 31 are arranged at positions corresponding to the four vertices of a rectangle in a cross section of the intermediate boom member taken along a plane perpendicular to the longitudinal direction of the member. Each of the four main pipes 31 is arranged so as to extend in the longitudinal direction of the intermediate boom member. Each of the four main pipes 31 has a main pipe base end 311, which is its base end in the longitudinal direction, and a main pipe tip end 312, which is its tip end in the longitudinal direction. In each intermediate boom member, the main pipe base end 311 is located closer to the boom base end than the main pipe tip end 312.

In each of the intermediate boom members 3B and 3C, each of the multiple inclined pipes 32 is arranged to connect two adjacent main pipes 31 out of the four main pipes 31. The multiple inclined pipes 32 are arranged in a zigzag pattern between the two main pipes 31. Each of the multiple inclined pipes 32 is arranged in an orientation that is inclined relative to the longitudinal direction of the intermediate boom member.

In the intermediate boom member 3B, each of the multiple horizontal pipes 33 is arranged to connect the main pipe tips 312 of two adjacent main pipes 31 out of the four main pipes 31. In the intermediate boom member 3B, each of the multiple horizontal pipes 33 is arranged in an orientation perpendicular to the longitudinal direction of the intermediate boom member 3B.

In the intermediate boom member 3C, each of the multiple horizontal pipes 33 is arranged to connect the main pipe base ends 311 of two adjacent main pipes 31 out of the four main pipes 31. In the intermediate boom member 3C, each of the multiple horizontal pipes 33 is arranged in an orientation perpendicular to the longitudinal direction of the intermediate boom member 3C.

The boom 3 further includes four connectors 80 for connecting the intermediate boom member 3B and the intermediate boom member 3C. The four connectors 80 connect the four main pipes 31 of the intermediate boom member 3B to the four main pipes 31 of the intermediate boom member 3C. As shown in Figures 4 and 5, each of the four connectors 80 includes a first connector portion 81 and a second connector portion 82. The first connector portion 81 is attached to the main pipe tip end portion 312 of the main pipe 31 of the intermediate boom member 3B, and the second connector portion 82 is attached to the main pipe base end portion 311 of the main pipe 31 of the intermediate boom member 3C.

One of the first connector portion 81 and the second connector portion 82 is a male connector portion having a male shape, and the other of the first connector portion 81 and the second connector portion 82 is a female connector portion having a female shape. In this embodiment, the first connector portion 81 is a female connector portion and the second connector portion 82 is a male connector portion, but these may have the opposite shapes.

The first connector portion 81 has an attachment portion 81A that is attached to the main pipe tip portion 312 of the main pipe 31 of the intermediate boom member 3B, and a pair of plate-shaped protrusions 81B that protrude from the attachment portion 81A in the longitudinal direction of the main pipe 31. The pair of protrusions 81B are spaced apart from each other in the left-right direction.

The second connector portion 82 has an attachment portion 82A that is attached to the main pipe base end portion 311 of the main pipe 31 of the intermediate boom member 3C, and a plate-shaped protruding portion 82B that protrudes from the attachment portion 82A in the longitudinal direction of the main pipe 31. The thickness of the protruding portion 82B is slightly smaller than the distance between the pair of protruding portions 81B. This allows the protruding portion 82B to be positioned between the pair of protruding portions 81B.

The boom 3 further includes four connecting pins 50 for use with the four connectors 80. Each of the pair of protrusions 81B of the first connector portion 81 has a pin hole 81H through which the connecting pin 50 is inserted, and the protrusion 82B of the second connector portion 82 has a pin hole 82H through which the connecting pin 50 is inserted. The pin hole 81H is a through-hole that penetrates the protrusion 81B in the left-right direction, and the pin hole 82H is a through-hole that penetrates the protrusion 82B in the left-right direction. When the protrusion 82B is positioned between the pair of protrusions 81B, the pin holes 81H of the pair of protrusions 81B and the pin holes 82H of the protrusions 82B are positioned in the same position in a side view. In this state, the connecting pins 50 are inserted into these pin holes 81H and 82H, thereby connecting the first connector portion 81 and the second connector portion 82 to each other. The four connectors 80 are connected to the four connecting pins 50, thereby connecting the intermediate boom member 3B and the intermediate boom member 3C to each other. The structure of the connecting pins 50 will be described later.

As shown in FIG. 1, the jib 4 has a jib base end (jib foot), which is a base end supported by the boom 3 so as to be rotatable around a rotation center axis extending in the left-right direction, and a jib tip end, which is a tip end located on the opposite side of the jib base end in the longitudinal direction of the jib 4. The jib 4 is a so-called lattice-type jib and includes multiple jib members. The jib 4 has a structure in which multiple jib members are arranged and connected in a line in the longitudinal direction of the jib 4. The multiple jib members include a lower jib member 4A including the jib base end, an intermediate jib member 4B, and an upper jib member 4C including the jib tip end. A jib point sheave S4 is rotatably attached to the jib tip end. The multiple jib members may include multiple intermediate jib members. Alternatively, the intermediate jib members may be omitted.

In this embodiment, the crane 100 further includes a mast 5, a strut 6, a pair of left and right strut guy lines 7, a pair of left and right boom guy lines 8, a pair of left and right jib guy lines 17, a main hoisting rope 9, an auxiliary hoisting rope 10, a boom hoisting rope 18, a main hoisting hook 11, an auxiliary hoisting hook 12, a main hoisting winch 13, an auxiliary hoisting winch 14, and a boom hoisting winch 15.

The mast 5 is supported on the upper rotating body 2 behind the boom 3. A sheave block 19A is connected to the tip of the mast 5, and a sheave block 19B is arranged below and spaced apart from the sheave block 19A. The sheave block has multiple sheaves arranged in the width direction (left-right direction). A pair of left and right boom guy lines 8 connect the tip of the mast 5 to the tip of the boom.

The strut 6 is supported at the rear of the jib 4 at the jib base end of the jib 4 or the boom tip end of the boom 3. The strut 6 has a hoisting member connection portion connected to the jib base end of the jib 4 or the boom tip end of the boom 3, and a guy line connection portion to which the strut guy line 7 is connected. The strut 6 may be supported at the jib base end or the boom tip end so as to be rotatable around a rotation center axis extending in the left-right direction. As shown in Figure 2, in this embodiment, the strut 6 has a strut body 6A and a link member 6B.

The strut body 6A has a pair of left and right struts 601, 601 spaced apart in the left-right direction, and at least one beam member extending in the left-right direction to connect these struts. Each of the pair of struts 601, 601 has a strut base end (an example of the hoisting member connection portion) that is connected to the jib base end of the jib 4 (the base end of the lower jib member 4A), and a strut tip end that is located opposite the strut base end. Specifically, the strut base end of the right strut 601 is connected to the right portion of the jib base end of the jib 4, and the strut base end of the left strut 601 is connected to the left portion of the jib base end of the jib 4. Each of the pair of struts 601, 601 extends away from the jib base end of the jib 4. Each of the pair of support columns 601, 601 is positioned so that it stands upright above the jib base end of the jib 4 when the boom 3 and jib 4 are positioned in a collapsed position.

The link member 6B has a pair of left and right arm portions 602, 602 and a connecting portion 603 extending in the left-right direction to connect these arm portions 602, 602. The link member 6B is an example of the guy line connection portion. Each of the pair of arm portions 602, 602 has an arm base end, which is a base end connected to the respective pillar tip portions of the pair of pillars 601, 601, and an arm tip end, which is a tip end located on the longitudinal opposite side of the arm portion 602 from the arm base end. As shown in Figure 3, the left-right distance between the arm tip end of the right arm portion 602 and the arm tip end of the left arm portion 602 is greater than the left-right width of the tip end of the strut body 6A (the distance between the pillar tip end of the right pillar 601 and the pillar tip end of the left pillar 601). The connecting portion 603 connects the arm tip end of the right arm portion 602 to the arm tip end of the left arm portion 602.

As shown in Figures 1 to 3, a pair of strut guy lines 7 are strung between the boom 3 and the strut 6. Specifically, each of the pair of strut guy lines 7 is strung between the middle portion of the boom 3 and the link member 6B of the strut 6. The middle portion of the boom 3 is any portion of the boom 3 located between the boom base end and the boom tip end. In this embodiment, the middle portion of the boom 3 is the portion where the middle boom member 3B and the middle boom member 3C are connected to each other, or a portion in the vicinity thereof.

Each of the pair of strut guy lines 7 has a boom-side connection part 70 (connection link) connected to the middle section of the boom 3, a strut-side connection part 74 connected to the link member 6B of the strut 6, and a guy line main body, which is the rope section between these connection parts 70, 74. The connection structure between the boom-side connection part 70 and the middle section of the boom 3 will be described later. Note that the link member 6B can be omitted, in which case the strut-side connection part 74 of the pair of strut guy lines 7 may be connected to the strut main body 6A of the strut 6.

A pair of jib guy lines 17 are strung between the strut 6 and the jib 4. Specifically, each of the pair of jib guy lines 17 is strung between the strut body 6A of the strut 6 and the jib tip of the jib 4.

The boom hoisting rope 18 shown in Figure 1 is pulled out from the boom hoisting winch 15 and is looped multiple times between sheave block 19A and sheave block 19B.

The boom hoisting winch 15 is located on the upper rotating body 2. The boom hoisting winch 15 changes the distance between sheave block 19A and sheave block 19B by winding in and letting out the boom hoisting rope 18. This causes the boom 3 to be raised and lowered relative to the upper rotating body 2.

The main hoisting winch 13 winds and unwinds the main hoisting rope 9, thereby hoisting and lowering the main hoisting hook 11. The main hoisting rope 9 unwound from the main hoisting winch 13 extends downward from the jib tip of the jib 4 via the guide sheave S1 and jib point sheave S4, supporting the main hoisting hook 11. In this embodiment, the main hoisting winch 13 is located on the upper rotating body 2, but it may also be located on the boom 3.

The auxiliary winch 14 winds and unwinds the auxiliary hoisting hook 12, thereby raising and lowering the auxiliary hoisting hook 12. The auxiliary hoisting rope 10 pulled out from the auxiliary hoisting winch 14 extends downward from the boom tip of the boom 3 via the guide sheave S2 and boom point sheave S3, supporting the auxiliary hoisting hook 12. In this embodiment, the auxiliary hoisting winch 14 is located on the upper rotating body 2, but it may also be located on the boom 3.

When transporting the crane 100, it is disassembled into multiple parts and assembled at the destination. The assembly work for the crane 100 includes a strut guy line connection work, which is the work of connecting each of the pair of strut guy lines 7 to the middle section of the boom 3. The disassembly work for the crane 100 includes a strut guy line removal work, which is the work of removing each of the pair of strut guy lines 7 from the middle section of the boom 3. Hereinafter, the strut guy line connection work and strut guy line removal work may be referred to as the connection work and removal work. Each of the connection work and removal work is performed with the boom 3 and jib 4 in a lowered position. That is, during each of the connection work and removal work, the boom 3 and jib 4 are positioned in a lowered position so that the longitudinal directions of the boom 3 and jib 4 are oriented along the ground. The lowered position of the boom 3 and jib 4 is a position in which they are lowered even closer to the ground than the position of the boom 3 and jib 4 shown in Figure 2, for example.

In conventional cranes, one end of a pair of strut guy lines is typically connected to the left and right sections located at the top of the boom when the boom and jib are in the collapsed position (the upper section when the boom is collapsed). Each end of the pair of strut guy lines is connected to the upper section when the boom is collapsed via a so-called banana link. The banana link has a bent shape rather than a straight shape to avoid interference with the main pipe of the intermediate boom member. Connecting and disconnecting conventional cranes requires workers to climb up to and descend from the upper section when the boom is collapsed when the boom and jib are in the collapsed position. This makes connection and disconnection operations time-consuming. Furthermore, because the boom-side connection section (connection link), which is one end of the strut guy line, is heavy, it takes a long time to use an auxiliary crane to move the connection link to a high position corresponding to the upper section when the boom is collapsed. Furthermore, ensuring safety during connection and disconnection operations at a high position corresponding to the upper section when the boom is collapsed requires cost and time.

On the other hand, in the crane 100 according to this embodiment, the boom-side connection parts 70, 70 (connection links), which are one end of the pair of left and right strut guy lines 7, are connected to the lower-lower-down position P1, P1 (see FIG. 2), which is the portion located at the bottom of the boom 3 when the boom 3 and jib 4 are in the lowered position. Therefore, when connecting or disconnecting the crane 100 according to this embodiment, the operator does not need to climb to the upper-lower-down position P2, which is the portion located at the top of the boom 3 when the boom 3 and jib 4 are in the lowered position. This shortens the time required for the connection and disconnection operations compared to conventional methods. Furthermore, there is no need to use an auxiliary crane to move the boom-side connection parts 70 (connection links) to a higher position corresponding to the upper-lower-down position P2 of the boom 3. Furthermore, because connection and disconnection operations at a higher position corresponding to the upper-lower-down position P2 of the boom 3 are no longer necessary, the cost and time required for safety measures can be reduced compared to conventional methods.

When the boom 3 and jib 4 are positioned in the lowered position, the four connectors 80 include a lower right connector 80 located at the lower right, a lower left connector 80 located at the lower left, an upper right connector 80 located at the upper right, and an upper left connector 80 located at the upper left. The lower right connector 80 and the lower left connector 80 are each an example of a specific connector. The lower right connector 80 and the lower left connector 80 may also be referred to as a specific connector 80A. The lower right connector 80 and the lower left connector 80 are positioned corresponding to the left and right lower portions P1, P1 of the boom 3 when lowered (see Figure 2), respectively, and the upper right connector 80 and the upper left connector 80 are positioned corresponding to the left and right upper portions P2, P2 of the boom 3 when lowered, respectively.

In this embodiment, the four connecting pins 50 include two first connecting pins 50A, 50A shown in the upper diagram of FIG. 6 and two second connecting pins 50B, 50B shown in the lower diagram of FIG. 6. The two first connecting pins 50A, 50A are positioned at positions corresponding to the lower portions P1, P1 of the boom 3 when lowered, and the two second connecting pins 50B, 50B are positioned at positions corresponding to the upper portions P2, P2 of the boom 3 when lowered. Each of the first connecting pins 50A, 50A is an example of a specific connecting pin.

The first connecting pins 50A, 50A are inserted into the pin holes 81H, 82H of the first connector part 81 and the second connector part 82, respectively, and position the boom-side connection part 70 of the strut guy line 7 on the first connecting pin 50A. This joins the first connector part 81 and the second connector part 82 to each other, secures the boom-side connection part 70 of the strut guy line 7 to the first connecting pin 50A, and stretches the strut guy line 7 between the boom 3 and the strut 6. Meanwhile, the second connecting pins 50B, 50B are inserted into the pin holes 81H, 82H of the first connector part 81 and the second connector part 82, respectively, but do not position the boom-side connection part 70 of the strut guy line 7.

As shown in the upper diagram of FIG. 6, each of the first connecting pins 50A includes a head portion 51, a pin hole arrangement portion 52, a guy line attachment portion 53, and a retaining member attachment portion 54. The head portion 51, pin hole arrangement portion 52, guy line attachment portion 53, and retaining member attachment portion 54 are aligned in this order along the axial direction of the first connecting pin 50A. In this embodiment, the head portion 51 is located at the base end of the first connecting pin 50A, and the retaining member attachment portion 54 is located at the tip end of the first connecting pin 50A. The first connecting pin 50A is inserted into the pin holes 81H, 82H of the first connector portion 81 and the second connector portion 82 from the inside of the boom 3 widthwise (left side in FIG. 4) toward the outside of the boom 3 widthwise (right side in FIG. 4). As a result, the first connecting pin 50A is supported by the specific connector 80A with the axial direction of the first connecting pin 50A facing left and right.

As shown in FIG. 4, the dimension (outer diameter) of the head portion 51 in a direction perpendicular to the axial direction of the first connecting pin 50A is larger than the pin holes 81H, 82H of the first connector portion 81 and the second connector portion 82. This allows the head portion 51 to prevent the first connecting pin 50A from slipping out of the pin holes 81H, 82H to one side of the axial direction of the first connecting pin 50A (to the right in FIG. 4). In this embodiment, the head portion 51 has a disk shape, but the shape of the head portion 51 is not limited to a disk shape.

The pin hole arrangement portion 52 includes a portion disposed within the pin holes 81H, 82H of the first connector portion 81 and the second connector portion 82. The pin hole arrangement portion 52 is a cylindrical portion extending from the head portion 51 in the axial direction of the first connecting pin 50A and has an outer diameter slightly smaller than the pin holes 81H, 82H of the first connector portion 81 and the second connector portion 82. The pin hole arrangement portion 52 has an axial length sufficient to position the tip of the pin hole arrangement portion 52 outside the pin holes 81H, 82H when the first connecting pin 50A is inserted into the pin holes 81H, 82H of the first connector portion 81 and the second connector portion 82. The outer diameter of the pin hole arrangement portion 52 is also larger than the inner diameter of the pin hole 73H of the pin connection portion 73 (described later) in the boom-side connection portion 70. This allows the boom-side connection portion 70 of the strut guy line 7 to be fixed to the first connecting pin 50A with a gap formed between the boom-side connection portion 70 and the outer surface of the connector 80, specifically the outer surface of the first connector portion 81 (the right side surface in Figure 4). Note that Figure 4 is a plan view of the portion of the boom 3 corresponding to the right-side lower portion P1 when lowered, of the left and right lower portions P1, P1 when lowered, and Figure 5 is a side view of the portion corresponding to the right-side lower portion P1 when lowered.

The guy line attachment portion 53 is the portion to which the boom-side connection portion 70 of the strut guy line 7 is detachably attached. The guy line attachment portion 53 protrudes from the pin hole arrangement portion 52 in the axial direction of the first connecting pin 50A on the side opposite the head portion 51. In this embodiment, the guy line attachment portion 53 has a cylindrical shape and a smaller outer diameter than the pin hole arrangement portion 52. Note that the shape of the guy line attachment portion 53 is not limited to a cylindrical shape, and may be any other shape (such as a rectangular column) to which the boom-side connection portion 70 can be attached.

As shown in Figures 4 and 5, the boom-side connection part 70 (connection link) of the strut guy line 7 has a fixing part 71 to which one end of the guy line main body is fixed, and a pin connection part 73 to which the guy line attachment part 53 of the first connecting pin 50A is connected. In this embodiment, the pin connection part 73 includes a pair of protruding pieces that protrude from the fixing part 71 in the longitudinal direction of the strut guy line 7. Each of these protruding pieces has a pin hole 73H into which the guy line attachment part 53 of the first connecting pin 50A is inserted. The pin hole 73H is a through-hole that passes through the protruding piece of the pin connection part 73 in the left-right direction. The pin hole 73H of the pin connection part 73 of the boom-side connection part 70 has an inner diameter slightly larger than the outer diameter of the guy line attachment part 53.

The boom 3 further includes at least one retaining member. The retaining member mounting portion 54 is a portion to which the at least one retaining member is attached. The retaining member mounting portion 54 protrudes from the guy line mounting portion 53 in the axial direction of the first connecting pin 50A on the side opposite the head portion 51. As shown in FIG. 4 , the retaining member mounting portion 54 protrudes outward in the width direction of the boom 3 (to the right in FIG. 4 ) beyond the pin connection portion 73 when the head portion 51 is in contact with or close to the inner surface of the connector 80, specifically the inner surface of the first connector portion 81 (the left side in FIG. 4 ), the pin hole arrangement portion 52 is positioned in the pin holes 81H, 82H of the first connector portion 81 and the second connector portion 82, and the guy line mounting portion 53 is positioned in the pin hole 73H of the pin connection portion 73.

In this embodiment, the at least one retaining member includes a washer 101 and a nut 102, and the retaining member mounting portion 54 has a shape similar to a bolt (male thread). That is, a thread is formed on the outer surface of the retaining member mounting portion 54. As shown in FIGS. 4 and 5 , with the first connecting pin 50A inserted into the pin holes 81H, 82H of the first connector portion 81 and the second connector portion 82 and the pin hole 73H of the pin connection portion 73, the washer 101 is attached to the retaining member mounting portion 54, and the nut 102 is screwed onto the retaining member mounting portion 54. This positions the boom-side connection portion 70 of the strut guy line 7 on the first connecting pin 50A and prevents the boom-side connection portion 70 from slipping off the first connecting pin 50A.

As shown in FIG. 4 , in this embodiment, the boom-side connection 70 of the right strut guy line 7 is positioned to the right of the lower right connector 80 (specific connector 80A), i.e., adjacent to the lower right connector 80 on the outer side of the width of the boom 3 relative to the lower right connector 80. Although not shown, the boom-side connection 70 of the left strut guy line 7 is positioned to the left of the lower left connector 80 (specific connector 80A), i.e., adjacent to the lower left connector 80 on the outer side of the width of the boom 3 relative to the lower left connector 80. This allows the left and right boom-side connections 70 to be fixed adjacent to the lower right connector 80 and the lower left connector 80, respectively, without interfering with the middle boom member 3C of the boom 3.

As mentioned above, the second connecting pins 50B, 50B are inserted into the pin holes 81H, 82H of the first connector portion 81 and the second connector portion 82, respectively, but there is no need to position the boom-side connection portion 70 of the strut guy line 7. Therefore, as shown in the lower diagram of Figure 6, each of the second connecting pins 50B, 50B has a head portion 51, a pin hole arrangement portion 52, and a retaining member attachment portion 54, similar to the first connecting pin 50A, but does not have the guy line attachment portion 53 of the first connecting pin 50A. Therefore, in each of the second connecting pins 50B, 50B, the retaining member attachment portion 54 protrudes from the pin hole arrangement portion 52 in the axial direction of the second connecting pin 50B, on the side opposite the head portion 51.

As described above, the crane 100 according to this embodiment can improve the workability of strut guy line connection and strut guy line removal operations.

In addition, in this embodiment, the boom-side connection part 70 of the strut guy line 7 is positioned adjacent to the specific connector 80A on the outer side of the boom 3 in the width direction relative to the specific connector 80A. Therefore, by positioning the boom-side connection part 70 of the strut guy line 7 on the outer side of the boom 3 in the width direction relative to the specific connector 80A, the guy line body of the strut guy line 7 can be extended from that position toward the strut 6, making it easier to avoid interference between the strut guy line 7 and the boom 3, as shown in Figure 3.

In addition, in this embodiment, the left-right width of the tip of the strut body 6A is smaller than the distance between the boom-side connection part 70 of the right strut guy line 7 and the boom-side connection part 70 of the left strut guy line 7. The strut 6 has a strut body 6A and a link member 6B supported by the strut body 6A. The strut-side connection part 74 of the link member 6B can be positioned further outward in the width direction of the boom 3 than the support column 601 of the strut body 6A. This makes it easier to avoid interference between the strut guy line 7 and the boom guy line 8.

In addition, in this embodiment, the first connecting pin 50A (specific connecting pin) connects the first connector portion 81 and the second connector portion 82 of the specific connector 80A and positions the boom-side connection portion 70 of the strut guy line 7, thereby minimizing the increase in the number of parts.

Figures 7 to 10 show modified examples of this embodiment. Figure 7 is a view from diagonally above of the connection structure connecting the boom-side connection part 70 of the strut guy line 7 to the boom 3 in a crane 100 according to this modified example. Figure 8 is a view from diagonally below of this connection structure, and Figure 9 is a cross-sectional view of this connection structure. Figure 10 is a perspective view of the first connecting pin 60 used in this connection structure. Note that the structure of the crane 100 according to this modified example, other than this connection structure, is the same as that of the crane 100 according to the embodiment shown in Figures 1 to 6. Therefore, the following will mainly describe the connection structure according to this modified example.

The first connecting pins 60 in the modified example shown in Figure 10 are positioned in the same positions as the first connecting pins 50A shown in Figure 6, i.e., positions corresponding to the lower portions P1, P1 of the boom 3 when the boom 3 and jib 4 are positioned in the lowered position.

As shown in FIG. 10 , the first connecting pin 60 includes a pin body and a fixing member 65. The pin body includes a head portion 61, a pin hole arrangement portion 62, and a retaining member attachment portion 64. The head portion 61, pin hole arrangement portion 62, and retaining member attachment portion 64 are aligned in this order along the axial direction of the first connecting pin 60. The head portion 61 is located at the base end of the first connecting pin 60, and the retaining member attachment portion 64 is located at the tip end of the first connecting pin 60. In this modification, the fixing member 65 is configured as a separate member from the pin body and is attached to the head portion 61. The first connecting pin 60 is inserted into the pin holes 81H, 82H of the first connector portion 81 and the second connector portion 82 from the outer side of the boom 3 in the width direction (the right side in FIG. 9 ) toward the inner side in the width direction (the left side in FIG. 9 ).

As shown in Figure 9, the dimension of the head portion 61 of the first connecting pin 60 in a direction perpendicular to the axial direction of the pin body is larger than the pin holes 81H, 82H of the first connector portion 81 and the second connector portion 82. This prevents the head portion 61 from slipping out of the pin holes 81H, 82H to one side in the axial direction of the first connecting pin 60 (the left side in Figure 9). The head portion 61 has a through hole 63 that passes through the head portion 61 in a direction perpendicular to the axial direction of the first connecting pin 60. A fixing member 65 is inserted into the through hole 63.

The pin hole arrangement portion 62 and the retaining member attachment portion 64 are aligned in the axial direction of the first connecting pin 60 and have a cylindrical shape. The pin hole arrangement portion 62 includes a portion that is positioned within the pin holes 81H, 82H of the first connector portion 81 and the second connector portion 82. The pin hole arrangement portion 62 and the retaining member attachment portion 64 have an outer diameter slightly smaller than the pin holes 81H, 82H of the first connector portion 81 and the second connector portion 82.

When the pin hole arrangement portion 62 is disposed within the pin holes 81H, 82H of the first connector portion 81 and the second connector portion 82, the anti-slip member attachment portion 64 is disposed outside these pin holes 81H, 82H (on the left side in FIG. 9 ). The anti-slip member attachment portion 64 is a portion that protrudes from the pin hole arrangement portion 62 in the axial direction of the first connecting pin 60 on the side opposite the head portion 61. As shown in FIG. 9 , when the head portion 61 is in contact with or close to the outer surface of the specific connector 80A, specifically the outer surface of the first connector portion 81 (the right side in FIG. 9 ), and the pin hole arrangement portion 62 is disposed within the pin holes 81H, 82H of the first connector portion 81 and the second connector portion 82, the anti-slip member attachment portion 64 protrudes inward in the width direction (on the left side in FIG. 9 ) beyond the inner surface of the specific connector 80A, specifically the inner surface of the first connector portion 81 (the left side in FIG. 9 ).

The boom 3 of the crane 100 according to the modified example further includes a retaining member 66. The retaining member mounting portion 64 is the portion to which the retaining member 66 is attached. The retaining member mounting portion 64 is formed with a through-hole 64A that passes through the retaining member mounting portion 64 in a direction perpendicular to the axial direction of the pin body of the first connecting pin 60.

In this modified example, the retaining member 66 has an insertion portion that is inserted into the through-hole 64A of the retaining member attachment portion 64, and an annular portion that is connected to one end of the insertion portion and has a shape that surrounds the outer periphery of the retaining member attachment portion 64. As shown in Figures 8 and 9, with the first connecting pin 60 inserted into the pin holes 81H, 82H of the first connector portion 81 and the second connector portion 82, the insertion portion of the retaining member 66 is inserted into the through-hole 64A of the retaining member attachment portion 64, and the annular portion of the retaining member 66 is positioned to surround the outer periphery of the retaining member attachment portion 64. This secures the first connecting pin 60 to the first connector portion 81 and the second connector portion 82.

The guy line attachment portion is the portion to which the boom-side connection portion 70 of the strut guy line 7 is detachably attached. In this modified example, the guy line attachment portion includes a head portion 61 of the pin body and a fixing member 65. The fixing member 65 is a cylindrical (pin-shaped) member that is inserted into the through-hole 63 of the head portion 61. In this embodiment, the fixing member 65 includes a pin (a pin with a flange) and a retaining member. The fixing member 65 has an intermediate portion 65A that is positioned within the through-hole 63 of the head portion 61 when inserted into the through-hole 63, an attachment end portion 65B that is one end extending from the intermediate portion 65A in one axial direction of the fixing member 65 and positioned outside the through-hole 63, and an attachment end portion 65C that is the other end extending from the intermediate portion 65A in the other axial direction of the fixing member 65 and positioned outside the through-hole 63.

7 and 8, the boom-side connection portion 70 (connection link) of the strut guy line 7 has a fixing portion 71 to which one end of the guy line main body is fixed, and a pin connection portion 73 to which the fixing member 65 of the first connecting pin 60 is connected. The pin connection portion 73 includes a pair of protruding pieces that protrude from the fixing portion 71 in the longitudinal direction of the strut guy line 7. These protruding pieces have through holes into which the mounting ends 65B and 65C of the fixing member 65 of the first connecting pin 60 are inserted, respectively. As shown in FIG. 10, the mounting end 65B has a larger outer diameter than the through hole of the protruding piece of the pin connection portion 73. The middle portion 65A and the mounting end 65C have slightly smaller outer diameters than the through hole of the protruding piece of the pin connection portion 73 and the through hole 63 of the head portion 61. The intermediate portion 65A and mounting end portion 65C of the fixing member 65 are inserted into the through holes of the pair of protruding pieces in the pin connection portion 73 and the through hole 63 in the head portion 61, and the retaining member 65E (see Figure 8) is inserted into the through hole 65D (see Figure 10) formed in the mounting end portion 65C located outside the through holes of the protruding pieces and the through hole 63 in the head portion 61. This positions the boom side connection portion 70 of the strut guy line 7 on the first connecting pin 60.

In this variant, the specific connecting pin includes the pin body and a pin-shaped fixing member 65. The pin body is supported by the specific connector so as to be rotatable about its axis, and the boom-side connection part 70 of the strut guy line 7 is supported so as to be rotatable about the fixing member 65. This makes it possible to adjust the extension direction of the strut guy line 7 not only vertically but also horizontally. Therefore, this variant further improves the ease of strut guy line connection and removal operations compared to the embodiment shown in Figure 4. Furthermore, if the strut guy line 7 does not interfere with the boom 3 (specifically, the intermediate boom member 3C) even when the link member 6B is omitted, the extension direction of the strut guy line 7 can be adjusted by rotating the boom-side connection part 70 horizontally about the fixing member 65, making it easy to connect the strut-side connection part 74 to the strut body 6A of the strut 6.

The present disclosure is not limited to the embodiments described above. The present disclosure also encompasses, for example, the following aspects:

(A) Position of the Boom-Side Connection of the Strut Guy Line In the above embodiment, the boom-side connection 70 of the strut guy line 7 is located adjacent to the specific connector 80A on the outer side of the boom 3 in the width direction. However, it may also be located adjacent to the specific connector 80A on the inner side of the boom 3 in the width direction. Specifically, the boom-side connection 70 of the right strut guy line 7 may be located to the left of the lower right connector 80 (specific male connector 80A), i.e., on the inner side of the lower right connector 80 in the width direction of the boom 3, adjacent to the lower right connector 80 in the left-right direction. Also, the boom-side connection 70 of the left strut guy line 7 may be located to the right of the lower left connector 80 (specific connector 80A), i.e., on the inner side of the lower left connector 80 in the width direction of the boom 3, adjacent to the lower left connector 80 in the left-right direction. In this case, the orientation of the first connecting pin 50 is opposite to that shown in FIG. 4 . Similarly, in the modified crane 100, the boom side connection portion 70 of the strut guy line 7 may be positioned adjacent to the specific connector 80A on the inside of the width direction of the boom 3 relative to the specific connector 80A.

(B) Regarding the Specific Connecting Pin In the above embodiment, the head portion 51, pin hole arrangement portion 52, guy line attachment portion 53, and anti-slip member attachment portion 54 are arranged in this order along the axial direction of the first connecting pin 50A, but the arrangement order of these portions is not limited to the above embodiment. For example, the head portion 51, guy line attachment portion 53, pin hole arrangement portion 52, and anti-slip member attachment portion 54 may be arranged in this order along the axial direction of the first connecting pin 50A (specific connecting pin 50A). In this case, the boom-side connection portion 70 of the strut guy line 7 is attached to the guy line attachment portion 53 between the head portion 51 and the specific connector 80A. In this case, the insertion direction of the specific connecting pin 50A may be a direction (from the inside to the outside) in which the head portion 51 is located inside the specific connector 80A in the width direction of the boom 3, or a direction (from the outside to the inside) in which the head portion 51 is located outside the specific connector 80A in the width direction of the boom 3. When the insertion direction is from inside to outside, the boom-side connection part 70 of the strut guy line 7 is disposed between the head part 51 and the specific connector 80A, on the inside in the width direction of the boom 3 relative to the specific connector 80A. When the insertion direction is from outside to inside, the boom-side connection part 70 of the strut guy line 7 is disposed between the head part 51 and the specific connector 80A, on the outside in the width direction of the boom 3 relative to the specific connector 80A. In this variation, the retaining member attached to the retaining member attachment part 54 may include a washer 101 and a nut 102 as shown in Figure 4, or may include a retaining member 66 as shown in Figure 8.

(C) Regarding the strut In the above embodiment, the width in the left-right direction at the tip of the strut body 6A is smaller than the distance between the boom-side connection part 70 of the right strut guy line 7 and the boom-side connection part 70 of the left strut guy line 7, but the width in the left-right direction at the tip of the strut body 6A may be approximately the same as the distance between the left and right boom-side connection parts 70. In this case, the link member 6B of the strut 6 can be omitted.

(D) Regarding the Specifications of the Crane In the above embodiment, the machine body is a self-propelled crane including a lower traveling body, but the machine body may be fixed to the ground and not self-propelled. Also, while the crane 100 according to this embodiment is a so-called fixed jib crane, it may be a crane in which the angle of the jib 4 relative to the boom 3 is changeable.

(E) Regarding the Support Member In the above embodiment, the support member is configured by the mast 5, but the support member may be, for example, a gantry. The gantry is supported on the upper rotating body 2 behind the boom 3 and is connected to the tip of the boom 3 via, for example, a boom guy line.

1: Lower traveling body 2: Upper rotating body 3: Boom 3B: Intermediate boom member (an example of a first boom member)
3C: Intermediate boom member (an example of a second boom member)
4: Jib 5: Mast (an example of a support member)
6: Strut 6A: Strut body 6B: Link member 7: Strut guy line 8: Boom guy line 50: Connecting pin 50A: First connecting pin (specific connecting pin)
53: Guy line attachment portion 60: First connecting pin (specific connecting pin)
65: Guy line attachment portion 70: Boom side connection portion 74: Strut side connection portion 80: Connector 80A: Special connector 81H: Pin hole 82H: Pin hole 100: Crane P1: Lower portion when lowered P2: Upper portion when lowered

Claims (3)

The aircraft and
a boom supported on the aircraft body so as to be able to be raised and lowered, the boom including a first boom member and a second boom member arranged side by side in the longitudinal direction of the boom, a plurality of connectors connecting the first boom member and the second boom member, and a plurality of connecting pins inserted into pin holes of the plurality of connectors,
a jib supported by the boom and having a base end attached to a tip end of the boom;
a strut supported on the tip end of the boom or the base end of the jib , the strut being arranged in a position such that it stands upright upward from the tip end of the boom or the base end of the jib when the boom and the jib are arranged in a laid-down position;
a strut guy line stretched between a lower portion of the boom when lowered , which is a portion located under the boom when the boom and the jib are arranged in the lowered posture, and the strut, the strut having a boom side connection portion which is an end portion connected to the lower portion of the boom when lowered,
the plurality of connectors include a specific connector that is a connector that is arranged at a position corresponding to the lower side portion when the vehicle is lying down,
the plurality of connecting pins include a specific connecting pin that is inserted into the pin hole of the specific connector and has a guy line attachment portion that is a portion to which the boom side connection portion of the strut guy line is detachably attached. The aircraft and
a boom supported on the aircraft body so as to be able to be raised and lowered, the boom including a first boom member and a second boom member arranged side by side in the longitudinal direction of the boom, a plurality of connectors connecting the first boom member and the second boom member, and a plurality of connecting pins inserted into pin holes of the plurality of connectors,
a jib supported by the boom and having a base end attached to a tip end of the boom;
a strut supported on the tip end of the boom or the base end of the jib;
a strut guy line stretched between a lower portion of the boom when lowered, which is a portion located under the boom when the boom and the jib are arranged in a lowered posture, and the strut, the strut having a boom side connection portion which is an end portion connected to the lower portion of the boom when lowered,
the plurality of connectors include a specific connector that is a connector that is arranged at a position corresponding to the lower side portion when the vehicle is lying down,
the plurality of connecting pins include a specific connecting pin that is inserted into the pin hole of the specific connector and has a guy line attachment portion to which the boom side connection portion of the strut guy line is detachably attached,
A crane, wherein the boom side connection portion of the strut guy line is arranged in a position adjacent to the specific connector on the outer side of the boom in the width direction. The aircraft and
a boom supported on the aircraft body so as to be able to be raised and lowered, the boom including a first boom member and a second boom member arranged side by side in the longitudinal direction of the boom, a plurality of connectors connecting the first boom member and the second boom member, and a plurality of connecting pins inserted into pin holes of the plurality of connectors,
a jib supported by the boom and having a base end attached to a tip end of the boom;
a strut supported on the tip end of the boom or the base end of the jib;
a strut guy line stretched between a lower portion of the boom when lowered, which is a portion located under the boom when the boom and the jib are arranged in a lowered posture, and the strut, the strut having a boom side connection portion which is an end portion connected to the lower portion of the boom when lowered;
a support member supported on the airframe;
a boom guy line extending from the tip of the boom toward the support member,
the plurality of connectors include a specific connector that is a connector that is arranged at a position corresponding to the lower side portion when the vehicle is lying down,
the plurality of connecting pins include a specific connecting pin that is inserted into the pin hole of the specific connector and has a guy line attachment portion to which the boom side connection portion of the strut guy line is detachably attached,
the strut guy line has a strut-side connection portion at an end opposite to the boom-side connection portion and connected to the strut,
The strut is
a strut body including a support column extending from the tip end of the boom or the base end of the jib;
a link member supported by the strut body, the link member being capable of positioning the strut side connection portion further outward in the width direction of the boom than the support column.