Upper spreader mounting device and method for mounting an upper spreader

Abstract

To reduce labor and time required for work to mount an upper spreader to an undulating member.SOLUTION: A mounting pin 90 connects an upper spreader 30 to a mounting portion 50 by being inserted into an upper spreader side mounting hole 35 and a mounting portion side mounting hole 75. The mounting portion 50 is provided on a boom 13, is capable of mounting the upper spreader 30, and is configured to be able to change a pin mounting position P1 in a position adjustment direction D2. The pin mounting position P1 is the position where the mounting pin is attached to the mounting hole 75 on the side of the mounting portion. The position adjustment direction D2 is a direction including at least one of a boom height direction Zb (height direction of the boom 13) and a boom longitudinal direction Xb (longitudinal direction of the boom 13).SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an upper spreader mounting device for mounting an upper spreader on a undulating member, and a method for mounting the upper spreader.

Background Art

[0002] For example, Patent Document 1 etc. describe a conventional upper spreader mounting device. In the technique described in this document, the upper spreader is attached to an attachment portion provided on the undulating member by an attachment pin (see FIGS. 1 to 5 of this document). In this technique, it is intended to easily align the attachment hole of the attachment pin on the upper spreader side and the attachment hole of the attachment pin on the attachment portion side.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when the upper spreader is lowered toward a predetermined position of the attachment portion, the posture of the upper spreader changes depending on the center of gravity position of the upper spreader, and the tension of the guide line and the undulating rope connected to the upper spreader. As a result, when the upper spreader is lowered, the positions of the attachment hole of the attachment pin on the upper spreader side and the attachment hole of the attachment pin on the attachment portion side may not match. Therefore, it may be necessary to manually align the positions of the attachment holes. As a result, the work of attaching the upper spreader to the undulating member takes time and effort.

[0005] Therefore, an object of the present invention is to provide an upper spreader mounting device and a method for mounting an upper spreader that can suppress the time and effort required for the work of attaching the upper spreader to the undulating member.

Means for Solving the Problem

[0006] The upper spreader mounting device is provided on the hoisting member of the crane and includes an upper spreader, a mounting portion, and a mounting pin. The upper spreader has an upper spreader side mounting hole. The mounting portion is provided on the hoisting member and is capable of mounting the upper spreader, and has a mounting portion side mounting hole. The mounting pin connects the upper spreader to the mounting portion by being inserted into the upper spreader side mounting hole and the mounting portion side mounting hole. The mounting portion is configured to be variable in a position adjustment direction, which is a direction including at least one of the height direction and the longitudinal direction of the hoisting member, at a pin mounting position, which is a mounting position of the mounting pin to the mounting portion side mounting hole.

Effect of the Invention

[0007] With the above configuration, it is possible to suppress the labor and time required for the work of mounting the upper spreader to the hoisting member.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Mode for Carrying Out the Invention

[0009] (First Embodiment) With reference to FIGS. 1 to 6, a crane 1 provided with an upper spreader mounting device 20 shown in FIG. 1 will be described.

[0010] The crane 1 is a working machine that performs operations using a boom 13 (lifting member), and is, for example, a construction machine that performs construction work. The crane 1 includes a lower main body 11, an upper slewing body 12, a boom 13, a gantry 14 (lifting member), a lower spreader 15, a guy line 16, a hoisting winch 17, a hoisting rope 18, and an upper spreader mounting device 20.

[0011] The lower main body 11 supports the upper slewing body 12 from the lower side Z2. The lower main body 11 may be capable of traveling or may not be capable of traveling. The crane 1 may be a mobile crane or a stationary crane.

[0012] The upper slewing body 12 (crane main body) is rotatable with respect to the lower main body 11. A boom 13 is rotatably attached to the upper slewing body 12. A gantry 14 is attached to the upper slewing body 12. The direction in which the rotation axis of the upper slewing body 12 with respect to the lower main body 11 extends is defined as the vertical direction Z. In the vertical direction Z, the side from the lower main body 11 toward the upper slewing body 12 is defined as the upper side Z1, and the opposite side is defined as the lower side Z2. The direction in which the rotation axis of the boom 13 with respect to the upper slewing body 12 extends is defined as the lateral direction Y. The direction orthogonal to each of the lateral direction Y and the vertical direction Z is defined as the longitudinal direction X. In the longitudinal direction X, the side from the attachment position of the gantry 14 to the upper slewing body 12 toward the attachment position of the boom 13 to the upper slewing body 12 is defined as the front side X1, and the opposite side is defined as the rear side X2.

[0013] The boom 13 (undulating member) is attached to the upper slewing body 12 so as to be undulatable (rotatable). The boom 13 is attached to the front side X1 portion of the upper slewing body 12. For example, the boom 13 is a lattice boom having a lattice structure combined with pipes. The central axis of the boom 13, which extends in the longitudinal direction of the boom 13, is defined as the boom central axis 13a. When the boom 13 is in a state where it is laid down so that the direction in which the boom central axis 13a extends is horizontal or substantially horizontal, the surface that becomes the upper surface of the boom 13 is defined as the boom rear surface 13b, and the surface that becomes the lower surface of the boom 13 is defined as the boom ventral surface 13c. The boom 13 includes a lower boom 13e, an intermediate boom 13f, and an upper boom 13g.

[0014] (Directions related to the boom 13) The direction in which the boom central axis 13a extends is defined as the boom longitudinal direction Xb. In the boom longitudinal direction Xb, the side from the base end portion (the portion on the side attached to the upper slewing body 12) of the boom 13 to the tip end portion (the portion on the side opposite to the side attached to the upper slewing body 12) is defined as the boom tip side Xb1, and the opposite side is defined as the boom base end side Xb2. The direction (lateral direction Y) in which the rotation axis of the boom 13 with respect to the upper slewing body 12 extends is also referred to as the boom lateral direction Yb. The direction orthogonal to each of the boom longitudinal direction Xb and the boom lateral direction Yb is defined as the boom height direction Zb. In the boom height direction Zb, the side from the boom ventral surface 13c to the boom rear surface 13b is defined as the boom upper side Zb1 (upper side of the undulating member), and the opposite side is defined as the boom lower side Zb2 (lower side of the undulating member).

[0015] The lower boom 13e includes the base end portion of the boom 13. The upper boom 13g includes the tip end portion of the boom 13. The intermediate boom 13f is provided between the lower boom 13e and the upper boom 13g. The lower boom 13e, the intermediate boom 13f, and the upper boom 13g are connected by a connecting tool such as a pin. By changing the number of intermediate booms 13f (two in the example shown in FIG. 1), the overall length of the boom 13 can be changed.

[0016] The gantry 14 (lifting member), the lower spreader 15, the guy line 16, the lifting winch 17, the lifting rope 18, and the upper spreader 30 (described later) constitute a boom lifting device that lifts the boom 13 with respect to the upper swing body 12.

[0017] The gantry 14 is attached to the upper swing body 12. The gantry 14 is disposed on the rear side X2 with respect to the boom 13. The gantry 14 includes a compression member 14c and a tension member 14d.

[0018] The compression member 14c is rotatably (liftably) attached to the upper swing body 12. The compression member 14c is detachably attached to the upper swing body 12 via a pin. When the crane 1 is in use (when crane operations are performed, such as when lifting a suspended load), the compression member 14c is arranged to extend rearward X2 and upward Z1 from the base end portion toward the tip end portion. Of the longitudinal ends of the compression member 14c, the end attached to the upper swing body 12 is the "base end portion", and the end opposite to the side attached to the upper swing body 12 is the "tip end portion". When disassembling and assembling the crane 1, etc., the compression member 14c may be in a collapsed position. The compression member 14c in the collapsed position is arranged such that the longitudinal direction of the compression member 14c extends in the front-rear direction X or substantially the front-rear direction X so as to extend rearward X2 from the base end portion toward the tip end portion. The upper surface of the compression member 14c when the compression member 14c is in the collapsed position is defined as the gantry back surface 14b. For example, the compression member 14c includes two (a pair of left and right) structures arranged at intervals in the lateral direction Y (not shown).

[0019] The tension member 14d is connected to the tip end portion of the compression member 14c and the upper swing body 12. The tension member 14d includes two (a pair of left and right) members arranged at intervals in the lateral direction Y (not shown). For example, each of the two members included in the tension member 14d is a structure in which link members are connected.

[0020] The lower spreader 15 is provided at the tip of the compression member 14c (the tip of the gantry 14). The lower spreader 15 includes a plurality of sheaves (pulleys) around which the luffing rope 18 is wound.

[0021] The guy line 16 is connected to the upper spreader 30 and the tip of the boom 13 (the upper boom 13g) when the crane 1 is in use. The guy line 16 may not be connected to the upper spreader 30 when the crane 1 is disassembled. For example, the guy line 16 may include a rope (guy rope, pendant rope), may include a link (guy link), or may include a rope and a link.

[0022] The luffing winch 17 (boom luffing winch) winds up and pays out the luffing rope 18. The luffing winch 17 may be attached to the upper slewing body 12 or may be attached to the compression member 14c (see the luffing winch 17 shown by the dashed-dotted line in FIG. 1).

[0023] The luffing rope 18 is wound around the luffing winch 17. The luffing rope 18 is drawn out from the luffing winch 17, wound around the sheaves of the lower spreader 15, and wound around the sheaves of the lower spreader 15 and the upper spreader 30. The tip of the luffing rope 18 is fixed to a predetermined location (such as the gantry 14, the lower spreader 15, or the upper spreader 30). When the luffing winch 17 winds up and pays out the luffing rope 18, the distance between the lower spreader 15 and the upper spreader 30 changes. When the crane 1 is in use, since the upper spreader 30 and the tip of the boom 13 are connected by the guy line 16, when the distance between the lower spreader 15 and the upper spreader 30 changes, the boom 13 luffs with respect to the upper slewing body 12.

[0024] The upper spreader attachment device 20 is provided on a hoisting member (e.g., the boom 13). The upper spreader attachment device 20 is a device for attaching the upper spreader 30 to the hoisting member. The upper spreader attachment device 20 makes it easy to attach the upper spreader 30 to the hoisting member. The upper spreader attachment device 20 includes the upper spreader 30, an attachment portion 50, and an attachment pin 90 (see FIG. 5).

[0025] The upper spreader 30 constitutes a boom hoisting device. The upper spreader 30 includes an upper spreader frame 31 shown in Fig. 2, an upper spreader sheave 33, an upper spreader side mounting hole 35, a guided portion support portion 37 (see Fig. 6), and a guided portion 40.

[0026] (Direction relative to upper spreader 30) Directions related to the upper spreader 30 include a spreader front-rear direction Xs, a spreader lateral direction Ys, and a spreader up-down direction Zs. As shown by the two-dot chain lines in Fig. 1, the derricking ropes 18 and the guy lines 16 may be connected to the upper spreader 30 and arranged in a substantially straight line (hereinafter, this state is referred to as the "used state" of the upper spreader 30). As shown in Fig. 3, the spreader front-rear direction Xs is the direction in which the derricking ropes 18 and the guy lines 16 extend when the upper spreader 30 is in the used state. As shown in Fig. 2, the spreader lateral direction Ys is a direction that coincides or substantially coincides with the lateral direction Y when the upper spreader 30 is in the used state. In the spreader lateral direction Ys, the side toward the center of the upper spreader 30 (the center in the spreader lateral direction Ys) is the inside of the spreader lateral direction Ys, and the side away from the center of the upper spreader 30 is the outside of the spreader lateral direction Ys. The spreader up-down direction Zs is a direction perpendicular or substantially perpendicular to each of the spreader front-rear direction Xs and the spreader lateral direction Ys.

[0027] The upper spreader frame 31 is a frame (structure) that supports the upper spreader sheave 33 and the guided portion 40. For example, the upper spreader frame 31 includes an upper and lower member 31a, side members 31b, and a guy line connection portion 31d.

[0028] The upper and lower member 31a constitutes both the upper and lower (vertical) portions of the upper spreader frame 31 in the spreader vertical direction Zs. For example, the upper and lower member 31a includes two plates arranged at intervals in the spreader vertical direction Zs.

[0029] The side members 31b constitute both the left and right (outer) portions of the upper spreader frame 31 outside the spreader lateral direction Ys. Each of the left and right side members 31b, 31b includes an inner side member 31bi and an outer side member 31bo, as shown in FIG. 6. The inner side member 31bi is a plate-like member extending in the spreader front-rear direction Xs and the spreader vertical direction Zs (similarly for the outer side member 31bo). An upper spreader side mounting hole 35 is formed in the inner side member 31bi (similarly for the outer side member 31bo). The outer side member 31bo is arranged outside the inner side member 31bi in the spreader lateral direction Ys. The outer side member 31bo constitutes the outer surface (side surface) of the upper spreader frame 31 in the spreader lateral direction Ys.

[0030] The guy line connection portion 31d is the portion to which the guy line 16 (see FIG. 3) is attached, as shown in FIG. 2. The guy line connection portion 31d includes, for example, a pin hole, and for example, a pin hole into which a pin for connecting the guy line 16 to the upper spreader 30 can be inserted. The guy line connection portion 31d may be provided on the upper and lower member 31a or on the side member 31b.

[0031] As shown in FIG. 3, the upper spreader sheave 33 is a sheave (pulley) around which the undulating rope 18 is looped. The upper spreader sheave 33 is rotatably attached to the upper spreader frame 31. The upper spreader sheave 33 may include a horizontal sheave or a vertical sheave. The direction of the rotation axis of the upper spreader sheave 33 of the horizontal sheave is the spreader vertical direction Zs. The direction of the rotation axis of the upper spreader sheave 33 of the vertical sheave is the spreader lateral direction Ys. The upper spreader sheave 33 may be attached to the vertical member 31a or the side member 31b.

[0032] As shown in FIG. 6, the upper spreader side attachment hole 35 is a hole (more specifically, the inner surface of the hole) into which the attachment pin 90 can be inserted. The upper spreader side attachment hole 35 is a portion for connecting the upper spreader 30 to the attachment portion 50 with the attachment pin 90. The upper spreader side attachment hole 35 is provided (formed) in the upper spreader frame 31. The upper spreader side attachment hole 35 is formed, for example, in the side member 31b, and is provided in each of the inner side member 31bi and the outer side member 31bo, for example.

[0033] The guided part support 37 rotatably supports the guided part 40 with respect to the upper spreader frame 31. The guided part support 37 is fixed to the upper spreader frame 31. The guided part support 37 protrudes from the upper spreader frame 31 in the spreader lateral direction Ys. The guided part support 37 is provided on both sides (left and right) of the upper spreader frame 31 in the spreader lateral direction Ys. For example, the guided part support 37 is cylindrical (hollow cylindrical, cylindrical pin). The inner surface of the guided part support 37 constitutes the upper spreader side attachment hole 35. For example, the portion radially inside (more specifically, radially inside of the inner surface of the guided part support 37) of the guided part support 37 is hollow (see the hollow portion 40c into which the attachment pin 90 is inserted). The direction of the central axis (central axis of the cylinder) of the guided part support 37 is the spreader lateral direction Ys.

[0034] As shown in Fig. 2, the guided part 40 is movable along a guide part 71 (described later) and is guided by the guide part 71. The guided part 40 is provided on the upper spreader frame 31. As shown in Fig. 6, the guided part 40 is arranged on the radially outer side of the guided part support part 37 (radially outer side of the guided part support part 37). As shown in Fig. 2, the guided part 40 is provided on both sides (left and right) in the spreader lateral direction Ys of the upper spreader frame 31. For example, the guided part 40 may be arranged on the outer side in the spreader lateral direction Ys with respect to the outer surface (outer side member 31bo) on the outer side in the spreader lateral direction Ys of the upper spreader frame 31, or may be arranged on the inner side in the spreader lateral direction Ys (not shown). As shown in Fig. 6, the guided part 40 has a cylindrical shape (hollow cylindrical shape) centered on a guided part central axis 40a described later. Note that the guided part 40 may have a columnar shape or the like centered on the guided part central axis 40a. The guided part 40 has a guided part central axis 40a and a hollow part 40c. Further, the guided part 40 includes a bearing 40b.

[0035] The guided part central axis 40a is the central axis of the guided part 40 and is a central axis extending in the spreader lateral direction Ys. The guided part central axis 40a is arranged so as to extend in a direction that coincides or substantially coincides with the spreader lateral direction Ys. For example, the guided part central axis 40a is arranged at a position overlapping the upper spreader side mounting hole 35 when viewed from the spreader lateral direction Ys. In the example shown in Fig. 5, the position of the guided part central axis 40a coincides or substantially coincides with the central axis of the upper spreader side mounting hole 35.

[0036] As shown in Fig. 6, the bearing 40b rotatably supports the guided part 40 with respect to the upper spreader frame 31. The guided part 40 is a roller attached to the upper spreader frame 31 around the guided part central axis 40a (rotation axis in the spreader lateral direction Ys). Note that the bearing 40b may not be provided, and the guided part 40 may not be a roller. The guided part 40 shown in Fig. 2 may be fixed to the upper spreader frame 31.

[0037] As shown in Fig. 6, the hollow portion 40c is a space (portion) radially inside the guided portion 40. The hollow portion 40c is provided so as to be continuous with the upper spreader side mounting hole 35, and more specifically, is provided so as to be continuous with the upper spreader side mounting hole 35 in the spreader lateral direction Ys. The hollow portion 40c is configured such that a mounting pin 90 can be inserted therethrough so as to penetrate the hollow portion 40c and the upper spreader side mounting hole 35. Note that the guided portion 40 may not have the hollow portion 40c (may not be hollow). Also, the upper spreader side mounting hole 35 may not be arranged at a position overlapping the hollow portion 40c when viewed from the spreader lateral direction Ys. The upper spreader side mounting hole 35 may be arranged radially outside the guided portion 40 when viewed from the spreader lateral direction Ys.

[0038] As shown in Fig. 1, the mounting portion 50 is a portion to which the upper spreader 30 is mounted. The mounting portion 50 is provided on the undulating member. More specifically, the mounting portion 50 includes, for example, a boom side mounting portion 50B provided on the boom 13 and a gantry side mounting portion 50G provided on the gantry 14. For example, the boom side mounting portion 50B is mounted on the boom rear surface 13b. For example, the gantry side mounting portion 50G is mounted on the gantry rear surface 14b. The boom side mounting portion 50B and the gantry side mounting portion 50G are configured in the same or substantially the same manner. Only one of the boom side mounting portion 50B and the gantry side mounting portion 50G provided on the gantry 14 may be provided. Hereinafter, the boom side mounting portion 50B will be mainly described.

[0039] This mounting portion 50 (boom side mounting portion 50B) may be provided on the lower boom 13e or the intermediate boom 13f. For example, the mounting portion 50 may be provided at the boom tip side Xb1 portion of the lower boom 13e.

[0040] As shown in Fig. 2, this mounting portion 50 is provided on both sides (left and right portions) in the boom lateral direction Yb of the boom 13. The mounting portion 50 includes a left mounting portion 50L which is the mounting portion 50 on the left side (left side when viewed toward the boom tip side Xb1), and a right mounting portion 50R which is the mounting portion 50 on the right side. The right mounting portion 50R and the left mounting portion 50L are configured to be symmetric or substantially symmetric with respect to each other in the boom lateral direction Yb. For example, the mounting portion 50 may be fixed to the outer portion in the boom lateral direction Yb of the boom 13 as in the example shown in Fig. 2, or may be fixed to the inner portion in the boom lateral direction Yb (e.g., outer end portion) of the boom 13 (not shown). Hereinafter, as the mounting portion 50, mainly the right mounting portion 50R of the boom side mounting portion 50B will be described. The mounting portion 50 includes a mounting portion frame 60. Focusing on the function of the mounting portion 50, the mounting portion 50 includes a guide portion 71, a regulating portion 73, a mounting portion side mounting hole 75, and a position adjusting mechanism 80.

[0041] The mounting portion frame 60 is a structure that constitutes the mounting portion 50. The mounting portion frame 60 includes a fixed frame 61, a movable frame 63, and a guide frame 65.

[0042] The fixed frame 61 is fixed to the boom 13. The fixing of the fixed frame 61 to the boom 13 may be, for example, by welding, or may be by fastening members (e.g., bolts and nuts, e.g., pins, etc.). The fixed frame 61 protrudes from the boom back surface 13b to the boom upper side Zb1. The fixed frame 61 is, for example, plate-shaped, and is provided so as to extend in the boom height direction Zb and the boom longitudinal direction Xb (the same applies to the movable frame 63 and the guide frame 65). The fixed frame 61 may also be block-shaped (the same applies to the movable frame 63 and the guide frame 65).

[0043] The movable frame 63 is movably attached to the fixed frame 61 (details will be described later).

[0044] The guide frame 65 is a frame (a guiding member, such as a guide plate, etc.) that includes a guiding portion 71. The guide frame 65 is attached to the movable frame 63 and is attached to the fixed frame 61 via the movable frame 63. The guide frame 65 may be directly attached to the fixed frame 61 (see FIG. 7, details will be described later). For example, the guide frame 65 may be detachably attached to the movable frame 63, may be rotatably attached to the movable frame 63, or may be fixed (constantly fixed, such as fixed firmly, etc.) to the movable frame 63. The guide frame 65 may be detachably attached to the fixed frame 61, may be rotatably attached to the fixed frame 61, or may be fixed (constantly fixed, such as fixed firmly, etc.) to the fixed frame 61. The attachment portion frame 60 may not be divided into the fixed frame 61 and the guide frame 65. For example, when it is not necessary to store (described later) the guide frame 65, the fixed frame 61 and the guide frame 65 may be integrally configured.

[0045] As shown in FIG. 5, this guide frame 65 is rotatable with respect to the fixed frame 61 about a rotation axis extending in the boom lateral direction Yb. Specifically, the guide frame 65 is rotatable with respect to the movable frame 63 about the guide fulcrum member 66. The guide frame 65 shown in FIG. 2 may be arranged outside the boom lateral direction Yb with respect to the movable frame 63, or may be arranged inside the boom lateral direction Yb (the relationship between the guide frame 65 and the fixed frame 61 is the same). As shown in FIG. 3, the guide frame 65 may be, for example, substantially polygonal, may be, for example, substantially triangular, or may not be, for example, substantially polygonal when viewed from the boom lateral direction Yb.

[0046] Hereinafter, the case where the guide frame 65 is rotatably attached to the movable frame 63 as shown in FIG. 5 will be described. For example, the guide frame 65 is attached to the movable frame 63 by a guide fulcrum member 66 and a guide fixing member 67. The guide fulcrum member 66 is a member that serves as a fulcrum for the rotation of the guide frame 65 with respect to the movable frame 63. The guide fulcrum member 66 may be a member including, for example, bolts and nuts, or a member (pin) having a columnar or cylindrical portion (the same applies to the guide fixing member 67). The guide fixing member 67 is a member that restricts the rotation of the guide frame 65 with respect to the movable frame 63. When the guide fulcrum member 66 and the guide fixing member 67 are attached (for example, inserted or fastened) to the movable frame 63 and the guide frame 65, the guide frame 65 is fixed to the movable frame 63.

[0047] When the attachment portion 50 is in use (when the upper spreader 30 is attached to the attachment portion 50), this guide frame 65 is arranged so as to protrude (stand up) upward on the boom Zb1 with respect to the fixed frame 61. As shown by the dashed two-dot line in FIG. 5, when the attachment portion 50 is not in use (for example, during crane operation), the guide frame 65 is arranged (stored) such that the amount of protrusion of the guide frame 65 upward on the boom Zb1 with respect to the fixed frame 61 is smaller than when the guide frame 65 is in use.

[0048] As shown in FIG. 3, the guide portion 71 can contact the guided portion 40 and guides the guided portion 40 along the inclination direction D1. More specifically, the guide portion 71 moves the guided portion 40 along the inclination direction D1 while bringing the guided portion 40 into contact with the guide portion 71. The guide portion 71 is fixed to the boom 13. The guide portion 71 is provided on the attachment portion frame 60, and more specifically, is provided on the guide frame 65. The direction (inclination direction D1) in which the guide portion 71 (inclination portion, inclined surface) extends is inclined with respect to the boom longitudinal direction Xb when viewed from the boom lateral direction Yb. The direction (inclination direction D1) in which the guide portion 71 extends coincides or substantially coincides with the boom longitudinal direction Xb when viewed from the boom height direction Zb. The guide portion 71 is inclined with respect to the boom longitudinal direction Xb so as to be disposed closer to the boom tip side Xb1 and lower on the boom side Zb2 (downward forward). Note that the guide portion 71 may be inclined with respect to the boom longitudinal direction Xb so as to be disposed closer to the boom base end side Xb2 and lower on the boom side Zb2 (downward backward). Hereinafter, the case where the guide portion 71 is inclined downward forward will be described. In the case where the guide portion 71 is inclined downward backward, for example, the boom tip side Xb1 and the boom base end side Xb2 in the following description may be reversed.

[0049] The inclination direction D1 of the guide portion 71 is a direction along the inclination of the guide portion 71. When viewed from the boom lateral direction Yb, the inclination direction D1 of the guide portion 71 may be a direction along a straight line (including a single straight line and a broken line), a direction along a curve, or a direction along a line including a straight line and a curve. The inclination of the guide portion 71 (the inclination of the inclination direction D1 with respect to the boom longitudinal direction Xb) may change stepwise, continuously, or not at all along the guide portion 71. As shown in FIG. 2, the guide portion 71 (for example, the guide frame 65) may restrict the movement of the upper spreader 30 in the boom lateral direction Yb. For example, when the side surface (for example, the side member 31b) of the upper spreader frame 31 contacts the guide portion 71, the guide portion 71 may restrict the movement of the upper spreader 30 in the boom lateral direction Yb. The left and right guide portions 71, 71 of the left attachment portion 50L and the right attachment portion 50R may be arranged so as to sandwich the upper spreader frame 31 from the spreader lateral direction Ys. The left and right guide portions 71, 71 do not have to be symmetrically configured with respect to the boom lateral direction Yb (the same applies to the restricting portion 73). The left and right guide portions 71, 71 may be configured according to the posture (described later) of the lower spreader 15 when it descends. For example, the inclination directions D1 (see FIG. 3) of the left and right guide portions 71, 71 may be different, or the lengths may be different.

[0050] As shown in FIG. 5, the restricting portion 73 can contact the guided portion 40 and restricts the movement of the guided portion 40 with respect to the mounting portion 50. The restricting portion 73 restricts the movement of the guided portion 40 in the inclined direction D1 (see FIG. 3). As shown in FIG. 3, the restricting portion 73 may be discontinuous (may be separated) from the guide portion 71 or may be continuous with the guide portion 71 (see the restricting portion 273 shown in FIG. 7). The restricting portion 73 may be fixed to the movable frame 63 or may be fixed to the guide frame 65 (see the restricting portion 273 shown in FIG. 7). For example, the restricting portion 73 may be fixed to the movable frame 63 (or the guide frame 65) by welding or may be fixed by a fastening member or the like. As shown in FIG. 2, the restricting portion 73 projects outward in the boom lateral direction Yb from the outer surface (side surface) of the fixed frame 61 on the outer side of the boom lateral direction Yb. The restricting portion 73 may be plate-shaped or may be block-shaped or the like. The restricting portion 73 is arranged so as to suppress interference between the restricting portion 73 and the guided portion 40 when the upper spreader 30 is removed from the mounting portion 50 shown in FIG. 5. For example, the restricting portion 73 is substantially J-shaped or the like when viewed from the boom lateral direction Yb.

[0051] As shown in FIG. 6, the mounting portion side mounting hole 75 is a hole (more specifically, the inner surface of the hole) into which the mounting pin 90 can be inserted. The mounting portion side mounting hole 75 is arranged at a position where the mounting pin 90 can be inserted into the upper spreader side mounting hole 35 and the mounting portion side mounting hole 75 when the guided portion 40 contacts the restricting portion 73 (see FIG. 5). For example, the mounting portion side mounting hole 75 is arranged at a position where the mounting pin 90 can be inserted into the mounting portion side mounting hole 75 from the outer side in the boom lateral direction Yb of the upper spreader 30 and the mounting portion 50. For example, as shown in FIG. 2, the mounting portion side mounting hole 75 is provided (formed) in the movable frame 63. The mounting position of the mounting pin 90 in the mounting portion side mounting hole 75 is defined as the pin mounting position P1. The pin mounting position P1 is the space inside the mounting portion side mounting hole 75 and the space around it, and is the position where the mounting pin 90 should be arranged when the upper spreader 30 is mounted on the mounting portion 50 as shown in FIG. 4.

[0052] As shown in FIG. 3, the position adjustment mechanism 80 is a mechanism that makes the pin attachment position P1 variable in the position adjustment direction D2. The position adjustment direction D2 is a direction including at least one of the boom height direction Zb (the height direction of the undulating member) and the boom longitudinal direction Xb (the longitudinal direction of the undulating member). The position adjustment direction D2 may be a direction inclined with respect to the vertical direction Z or a direction inclined with respect to the boom longitudinal direction Xb. The position adjustment direction D2 is the direction guided by the position adjustment guide portion 81 described later. Note that the position adjustment mechanism 80 does not need to make the pin attachment position P1 variable in the boom lateral direction Yb. The position adjustment mechanism 80 is configured to make the pin attachment position P1 variable by making the position of at least one of the regulation portion 73 and the attachment portion side attachment hole 75 with respect to the boom 13 variable in the position adjustment direction D2. Specifically, for example, the position adjustment mechanism 80 makes the pin attachment position P1 variable in the position adjustment direction D2 by making the movable frame 63, to which the regulation portion 73 is fixed and the attachment portion side attachment hole 75 is provided, variable in the position adjustment direction D2. The position adjustment mechanism 80 may make the guide portion 71 variable in the position adjustment direction D2. Specifically, for example, as a result of making the movable frame 63 variable in the position adjustment direction D2, the position adjustment mechanism 80 makes the guide portion 71 variable in the position adjustment direction D2. The position adjustment mechanism 80 includes a position adjustment guide portion 81, a positioning member attachment hole 83, and a positioning member 85.

[0053] The position adjustment guide portion 81 guides the movement of a part of the attachment portion frame 60 so that the pin attachment position P1 becomes variable in the position adjustment direction D2. For example, the position adjustment guide portion 81 guides the movement of the movable frame 63 with respect to the fixed frame 61. For example, the position adjustment guide portion 81 may be configured by unevenness, or may be configured by a long hole and a member inserted into the long hole (see the position adjustment mechanism 280 shown in FIG. 7 and the position adjustment mechanism 380 shown in FIG. 9). For example, the position adjustment guide portion 81 includes a convex portion 81a and a concave portion 81b.

[0054] The convex portion 81a is provided on one of the fixed frame 61 and the movable frame 63. The concave portion 81b is provided on the side different from the side on which the concave portion 81b is provided among the fixed frame 61 and the movable frame 63. In the example shown in FIG. 3, the convex portion 81a is provided on the fixed frame 61, and the concave portion 81b is provided on the movable frame 63. The convex portion 81a may be provided on the movable frame 63, and the concave portion 81b may be provided on the fixed frame 61. Specifically, for example, the convex portion 81a is a plate-like member provided so as to extend in the position adjustment direction D2. The concave portion 81b is provided in the boom lower side Zb2 portion of the movable frame 63. The concave portion 81b is attached (inserted) to the convex portion 81a so as to be relatively movable in the position adjustment direction D2. The concave portion 81b is a groove (guide groove) provided so as to extend in the position adjustment direction D2. Specifically, for example, as shown in FIG. 6, the concave portion 81b is a groove between two plate-like members provided so as to sandwich the plate-like convex portion 81a.

[0055] As shown in FIG. 3, the positioning member mounting hole 83 is a hole (for example, a pin hole) to which the positioning member 85 is mounted. The positioning member mounting holes 83 are provided (formed) in each of the fixed frame 61 and the movable frame 63. The positioning member mounting holes 83 are provided in each of the convex portion 81a and the concave portion 81b. A plurality of positioning member mounting holes 83 are provided. The plurality of positioning member mounting holes 83 are arranged at intervals in the position adjustment direction D2. The plurality of positioning member mounting holes 83 may be arranged side by side in the boom longitudinal direction Xb, or may be arranged side by side in the boom height direction Zb. The positioning member mounting holes 83 may be provided in plurality in at least one of the movable frame 63 and the fixed frame 61, and only one may be provided in the other (the side different from the frame in which the plurality are provided). The positioning member mounting holes 83 may be provided in plurality in each of the movable frame 63 and the fixed frame 61. In the example shown in FIG. 3, a plurality (three) of positioning member mounting holes 83 are provided in the fixed frame 61, and only one is provided in the movable frame 63.

[0056] The positioning member 85 fixes (positions) the position of the movable frame 63 with respect to the fixed frame 61. The positioning member 85 fixes the position of the movable frame 63 with respect to the fixed frame 61 by being inserted into the fixed frame 61 and the movable frame 63. The positioning member 85 is inserted into the respective positioning member mounting holes 83 of the fixed frame 61 and the movable frame 63. For example, the positioning member 85 is a member (pin) having a columnar or cylindrical portion. Only one positioning member 85 may be provided, or a plurality of positioning members 85 may be provided. When a plurality of positioning members 85 are provided, the attachment (positioning, fixing) of the movable frame 63 with respect to the fixed frame 61 is more stable than when only one positioning member 85 is provided.

[0057] As shown in FIG. 5, the mounting pin 90 is a member for connecting (attaching, coupling) the upper spreader 30 to the attachment portion 50. As shown in FIG. 6, the mounting pin 90 connects the upper spreader 30 to the attachment portion 50 by being inserted into the upper spreader side mounting hole 35 and the attachment portion side mounting hole 75. For example, the mounting pin 90 is inserted into the hollow portion 40c (inside the upper spreader side mounting hole 35). The mounting pin 90 is a member (pin) having a columnar or cylindrical portion.

[0058] (Transportation of the crane) The crane 1 shown in FIG. 1 (particularly the upper spreader mounting device 20) is configured to operate as follows. During transportation of the crane 1, the crane 1 is in a disassembled state. This is for mounting the parts of the crane 1 on a transport vehicle (such as a trailer), and also for keeping the mass and dimensions during transportation within the regulated values. For example, during transportation of the crane 1, the lower boom 13e and the boom 13 (intermediate boom 13f and upper boom 13g) on the tip side of the lower boom 13e are separated. For example, during transportation, the lower boom 13e may be in a state of being attached to the upper slewing body 12, or may be in a state of being separated from the upper slewing body 12.

[0059] (Disassembly of the crane 1) Crane 1 is disassembled as follows. When Crane 1 is in an operable state, boom 13 is raised upward in the Z1 direction with respect to the upper slewing body 12 (not shown). In this state, the hoisting rope 18 is paid out (slackened) by the hoisting winch 17. Then, the tip of boom 13 (upper boom 13g) touches the ground. And the hoisting rope 18 is further paid out by the hoisting winch 17. Then, the upper spreader 30 moves downward in the Z2 direction toward the mounting portion 50 (here, the boom-side mounting portion 50B).

[0060] (Posture and position of the upper spreader) At this time, the upper spreader 30 is affected by the tension of the hoisting rope 18, the tension of the guy line 16, and the center of gravity positions of the upper spreader 30, the hoisting rope 18, and the guy line 16 respectively. Therefore, the upper spreader 30 shown in FIG. 2 descends toward the mounting portion 50 while tilting in various directions (while tilting about the front-rear direction X, the vertical direction Z, and the lateral direction Y). Therefore, when the left mounting portion 50L and the right mounting portion 50R are arranged symmetrically (left-right symmetrically) with respect to the boom lateral direction Yb, the contact positions of the guided portion 40 with the guide portion 71 of the left mounting portion 50L and the right mounting portion 50R may shift in the front-rear direction X and the vertical direction Z. Also, depending on the relative position between the upper spreader 30 and the mounting portion 50, there may be cases where the guided portion 40 cannot move smoothly along the guide portion 71, or where it stops in the middle of the guide portion 71 without contacting the restricting portion 73. When the guided portion 40 stops in the middle of the guide portion 71, the position where the guided portion 40 stops may shift in the vertical direction Z and the front-rear direction X between the left mounting portion 50L and the right mounting portion 50R. Also, depending on the relative position between the upper spreader 30 and the mounting portion 50, the guided portion 40 may separate (float) from the guide portion 71. As such, just lowering the upper spreader 30 may result in the positions of the upper spreader-side mounting hole 35 and the mounting-portion-side mounting hole 75 not matching or being difficult to match. Then, it may be impossible or difficult to insert the mounting pin 90 (see FIG. 4) into the upper spreader-side mounting hole 35 and the mounting-portion-side mounting hole 75.

[0061] (Position adjustment) Therefore, the pin mounting position P1 is adjusted to an appropriate position by the position adjustment mechanism 80. Specifically, when the upper spreader 30 is brought closer to the mounting portion 50 from above Z1 relative to the mounting portion 50, as shown in FIG. 4, the position of the pin mounting position P1 is adjusted in the position adjustment direction D2 so that the guided portion 40 contacts the guide portion 71. Then, with the pin mounting position P1 appropriately adjusted, the pin mounting position P1 is positioned (fixed) with respect to the boom 13. It is preferable that the pin mounting positions P1 of the left mounting portion 50L and the right mounting portion 50R (on both sides of the boom width direction Yb of the boom 13) are adjusted individually.

[0062] A specific example of the position adjustment of the pin mounting position P1 in the position adjustment direction D2 by the position adjustment mechanism 80 is as follows. The undulating rope 18 shown in FIG. 3 is loosened, and the upper spreader 30 is lowered. For example, even when the undulating rope 18 is loosened, the upper spreader 30 is in a state where it does not further descend. In this state, the positioning member 85 is in a state of being removed from the fixed frame 61 and the movable frame 63. Next, the movable frame 63 is moved in the position adjustment direction D2 (for example, substantially the boom longitudinal direction Xb) with respect to the fixed frame 61. At this time, as shown in FIG. 5, the position of the regulating portion 73 is adjusted so that the guided portion 40 contacts the guide portion 71 and the regulating portion 73. With this position adjustment performed, the positioning member 85 is attached to the fixed frame 61 and the movable frame 63. Thereby, the movable frame 63 is positioned with respect to the fixed frame 61.

[0063] As described above, the upper spreader 30 shown in FIG. 1 descends while inclining. At this time, if conditions such as the length of the guy line 16 (the length of the boom 13) and the wiring of the hoist rope 18 are constant, the inclination (posture) of the upper spreader 30 when descending has a certain tendency. On the other hand, when the length of the guy line 16 (the length of the boom 13) or the wiring of the hoist rope 18 is changed, the inclination (posture) of the upper spreader 30 when descending may change significantly compared to before the change. Therefore, it is preferable that the position adjustment by the position adjustment mechanism 80 (see FIG. 2) is performed when the length of the guy line 16 is changed (that is, when the length of the boom 13 is changed). Also, the position adjustment by the position adjustment mechanism 80 may be performed during the manufacture of the crane 1 or the like.

[0064] (Guide by the guide portion 71) A case where the upper spreader 30 is lowered in a state where the position of the pin attachment position P1 is adjusted by the position adjustment mechanism 80 shown in FIG. 3 will be described. When the upper spreader 30 descends toward the attachment portion 50, the guided portion 40 comes into contact with the guide portion 71 and moves downward along the guide portion 71 to the Z2 side. At this time, since the position of the pin attachment position P1 is adjusted by the position adjustment mechanism 80, the guided portion 40 can move smoothly along the guide portion 71. At this time, at each of the left attachment portion 50L and the right attachment portion 50R shown in FIG. 2 (both left and right), the guided portion 40 moves smoothly along the guide portion 71. As a result, the upper spreader 30 can move in a stable state.

[0065] When the guided part 40 further moves downward to Z2, as shown in FIG. 5, the guided part 40 comes into contact with the regulating part 73 while being in contact with the guiding part 71. Thus, the regulating part 73 restricts the movement of the guided part 40 in the inclined direction D1. At this time, since the position adjustment of the pin mounting position P1 by the position adjustment mechanism 80 has been performed, the guided part 40 can be reliably brought into contact with (seated on, moved to the final position) the regulating part 73. At this time, with each of the left mounting part 50L and the right mounting part 50R shown in FIG. 4 (both on the left and right), the guided part 40 can be reliably brought into contact with the regulating part 73.

[0066] As shown in FIG. 5, when the guided part 40 comes into contact with the guiding part 71 and the regulating part 73, the positions of the upper spreader side mounting hole 35 and the mounting part side mounting hole 75 match. As shown in FIG. 6, when the mounting pin 90 is inserted into the upper spreader side mounting hole 35 and the mounting part side mounting hole 75, the upper spreader 30 is connected to the mounting part 50.

[0067] As described above, by simply lowering (moving downward to Z2) the upper spreader 30 shown in FIG. 5, the guided part 40 smoothly moves along the guiding part 71 and appropriately contacts the regulating part 73. As a result, the positions of the upper spreader side mounting hole 35 and the mounting part side mounting hole 75 match. Therefore, the upper spreader mounting device 20 can eliminate or reduce the manual work of an operator for aligning the mounting holes, and can reduce the burden on the operator. Specifically, for example, the work of an operator on the boom rear surface 13b shown in FIG. 1 to move (for example, swing) the upper spreader 30 by hand or a bar can be eliminated or reduced. For example, since the work on the boom rear surface 13b is high-altitude work and is time-consuming, the upper spreader mounting device 20 can eliminate or reduce the high-altitude work. Also, the upper spreader mounting device 20 can eliminate or reduce the work of an operator to move the upper spreader 30 from the ground by a rope or the like. Therefore, the efficiency of the work of mounting the upper spreader 30 to the boom 13 can be improved, and the working time can be shortened.

[0068] (Effect of the First Invention) The effects of the upper spreader mounting device 20 provided on the boom 13 (lifting member) of the crane 1 shown in FIG. 1 are as follows. As shown in FIG. 5, the upper spreader mounting device 20 includes an upper spreader 30, a mounting portion 50, and a mounting pin 90. The upper spreader 30 has an upper spreader side mounting hole 35. The mounting portion 50 is provided on the boom 13 and can mount the upper spreader 30, and has a mounting portion side mounting hole 75. The mounting pin 90 connects the upper spreader 30 to the mounting portion 50 by being inserted into the upper spreader side mounting hole 35 and the mounting portion side mounting hole 75.

[0069] [Configuration 1] As shown in FIG. 3, the mounting portion 50 is configured such that the pin mounting position P1 is variable in the position adjustment direction D2. The pin mounting position P1 is the mounting position of the mounting pin 90 (see FIG. 5) to the mounting portion side mounting hole 75. The position adjustment direction D2 is a direction including at least one of the boom height direction Zb (the height direction of the boom 13) and the boom longitudinal direction Xb (the longitudinal direction of the boom 13).

[0070] With the above [Configuration 1], the following effects can be obtained. When the upper spreader 30 is lowered from above Z1 of the mounting portion 50 to a predetermined position of the mounting portion 50, it may be difficult to insert the mounting pin 90 (see FIG. 5) into the upper spreader side mounting hole 35 and the mounting portion side mounting hole 75 (details are as above). Therefore, an operation of changing the position of the upper spreader 30 is required to align the positions of the upper spreader side mounting hole 35 and the mounting portion side mounting hole 75, which is time-consuming and laborious. Thus, the mounting portion 50 of the above [Configuration 1] is configured to be variable in the position adjustment direction D2 at the pin mounting position P1 which is the mounting position of the mounting pin 90 (see FIG. 5). Therefore, when the upper spreader 30 is lowered with the pin mounting position P1 adjusted to an appropriate position, the positions of the upper spreader side mounting hole 35 and the mounting portion side mounting hole 75 are likely to match. Therefore, the operation of changing the position of the upper spreader 30 to align the positions of the upper spreader side mounting hole 35 and the mounting portion side mounting hole 75 can be made unnecessary or reduced. Once the pin mounting position P1 is adjusted to an appropriate position, if conditions such as the length of the boom 13 (see FIG. 1) are constant, adjustment of the position of the pin mounting position P1 is unnecessary. Therefore, the labor and time required for the operation of attaching the upper spreader 30 to the boom 13 can be suppressed.

[0071] (Effect of the Second Invention) The upper spreader 30 includes a guided portion 40. The mounting portion 50 includes a guide portion 71 and a restricting portion 73. The guide portion 71 can contact the guided portion 40. The guide portion 71 guides the guided portion 40 along an inclined direction D1 which is a direction inclined with respect to the boom longitudinal direction Xb when viewed from the boom lateral direction Yb (the lateral direction of the boom 13). The restricting portion 73 can contact the guided portion 40 and restricts the movement of the guided portion 40 in the inclined direction D1. As shown in FIG. 5, the mounting portion side mounting hole 75 is arranged at a position where the mounting pin 90 can be inserted into the upper spreader side mounting hole 35 and the mounting portion side mounting hole 75 when the guided portion 40 contacts the guide portion 71 and the restricting portion 73.

[0072] [Configuration 2] As shown in FIG. 3, the attachment portion 50 is configured to make the position of at least one of the restricting portion 73 and the attachment hole 75 on the attachment portion side with respect to the boom 13 variable in the position adjustment direction D2, so that the pin attachment position P1 is variable in the position adjustment direction D2.

[0073] In the above [Configuration 2], in the configuration in which the attachment portion 50 includes the guide portion 71 and the restricting portion 73, a configuration for reliably adjusting the pin attachment position P1 in the position adjustment direction D2 can be specifically realized.

[0074] (Effect of the Third Invention) [Configuration 3] The attachment portion 50 includes a fixed frame 61, a movable frame 63, a convex portion 81a, a concave portion 81b, and a positioning member 85. The fixed frame 61 is fixed to the boom 13. The movable frame 63 is movable with respect to the fixed frame 61, and the attachment hole 75 on the attachment portion side is formed. The convex portion 81a is provided on one of the fixed frame 61 and the movable frame 63. The concave portion 81b is provided on the side different from the side on which the concave portion 81b is provided among the fixed frame 61 and the movable frame 63. The concave portion 81b is attached to the convex portion 81a so as to be relatively movable in the position adjustment direction D2. The positioning member 85 is inserted into the fixed frame 61 and the movable frame 63 to fix the position of the movable frame 63 with respect to the fixed frame 61.

[0075] In the above [Configuration 3], the fixed frame 61 is fixed to the boom 13, and a mounting portion side mounting hole 75 is formed in the movable frame 63. Then, the position of the movable frame 63 can be adjusted with respect to the fixed frame 61. Therefore, the position of the mounting portion side mounting hole 75 with respect to the boom 13 can be adjusted. Therefore, the pin mounting position P1 can be adjusted in the position adjustment direction D2. Further, in the above [Configuration 3], convex portions 81a and concave portions 81b are provided on the fixed frame 61 and the movable frame 63. The concave portion 81b is attached to the convex portion 81a so as to be relatively movable in the position adjustment direction D2. Therefore, with the simple configuration of the convex portion 81a and the concave portion 81b, the position of the mounting portion side mounting hole 75 with respect to the boom 13 can be adjusted in the position adjustment direction D2. Therefore, the pin mounting position P1 can be adjusted in the position adjustment direction D2 with a simple configuration.

[0076] (Effect of the Sixth Invention) [Configuration 6] As shown in FIG. 2, the mounting portions 50 (specifically, the right mounting portion 50R and the left mounting portion 50L) are provided on both side portions in the boom lateral direction Yb.

[0077] According to the above [Configuration 6], the following effect can be obtained. When the upper spreader 30 is lowered and stopped, the position of the upper spreader side mounting hole 35 with respect to the right mounting portion 50R and the position of the upper spreader side mounting hole 35 with respect to the left mounting portion 50L may be asymmetric (shifted) in the boom lateral direction Yb. Therefore, in the above [Configuration 6], the pin mounting position P1 can be adjusted in the position adjustment direction D2 for each of the right mounting portion 50R and the left mounting portion 50L (see the above [Configuration 1]). Therefore, for each of the right mounting portion 50R and the left mounting portion 50L, the positions of the upper spreader side mounting hole 35 and the mounting portion side mounting hole 75 can be aligned, and a mounting pin 90 (see FIG. 4) can be inserted into these mounting holes.

[0078] (Effect of the Seventh Invention) The effects of the mounting method of the upper spreader 30 of the present embodiment are as follows. The mounting portions 50 (specifically, the right mounting portion 50R and the left mounting portion 50L) are provided on both side portions in the boom lateral direction Yb.

[0079] [Configuration 7] When the upper spreader 30 approaches the mounting portion 50 from above Z1, which is above the mounting portion 50, the pin mounting positions P1 of the respective mounting portions 50 provided on both side portions in the boom lateral direction Yb are individually adjusted so that the guided portion 40 contacts the guide portion 71.

[0080] According to the above [Configuration 7], in each of the right mounting portion 50R and the left mounting portion 50L, the positions of the upper spreader side mounting hole 35 and the mounting portion side mounting hole 75 can be aligned, and a mounting pin 90 (see FIG. 4) can be inserted into these mounting holes.

[0081] (Second Embodiment) Referring to FIGS. 7 to 8, the differences between the upper spreader mounting device 220 of the second embodiment and the first embodiment will be described. For the common points between the upper spreader mounting device 220 and the first embodiment, the description will be omitted. The description of the common points to be omitted also applies to the description of the third embodiment to be described later. The outline of the differences is as follows. In the example shown in FIG. 3, the movable frame 63 was variable in the position adjustment direction D2 with respect to the fixed frame 61. And since the positions of the mounting portion side mounting hole 75 and the restricting portion 73 were variable in the position adjustment direction D2, the pin mounting position P1 was variable in the position adjustment direction D2. On the other hand, as shown in FIG. 7, in the present embodiment, the mounting portion side mounting hole 275 is an elongated hole. And since the position of the restricting portion 273 with respect to the boom 13 is variable in the longitudinal direction of the mounting portion side mounting hole 275 (that is, the position adjustment direction D2), the pin mounting position P1 is variable in the position adjustment direction D2. The details of the differences are as follows.

[0082] The mounting portion 250 is configured such that the position of the restricting portion 273 with respect to the boom 13 is variable in the longitudinal direction of the mounting portion side mounting hole 275, so that the pin mounting position P1 is variable in the position adjustment direction D2. Specifically, the mounting portion 250 includes a fixed frame 261, a guide frame 265, a restricting portion 273, a mounting portion side mounting hole 275, and a position adjustment mechanism 280.

[0083] In the example shown in FIG. 3, the guide fulcrum member 66 and the guide fixing member 67 are attached to the movable frame 63 and the guide frame 65. On the other hand, as shown in FIG. 7, in the present embodiment, the guide fulcrum member 66 and the guide fixing member 67 are attached to the fixed frame 261 and the guide frame 265.

[0084] The restricting portion 273 is configured as follows. In the example shown in FIG. 3, the restricting portion 73 is fixed to the movable frame 63. On the other hand, as shown in FIG. 7, in the present embodiment, the restricting portion 273 is fixed to the guide frame 265. For example, the restricting portion 273 is provided so as to project from the guide portion 71 toward the boom tip side Xb1 and the boom upper side Zb1. For example, the restricting portion 273 may be block-shaped or substantially plate-shaped. In the example shown in FIG. 7, the restricting portion 273 is substantially triangular when viewed from the boom lateral direction Yb.

[0085] The mounting portion side mounting hole 275 is configured as follows. In the example shown in FIG. 3, the mounting portion side mounting hole 75 is provided in the movable frame 63 and is not a long hole (for example, a circular hole when viewed from the boom lateral direction Yb). On the other hand, as shown in FIG. 7, in the present embodiment, the mounting portion side mounting hole 275 is provided in the fixed frame 261. The mounting portion side mounting hole 275 is a long hole that is long in the position adjustment direction D2. In the example shown in FIG. 7, the longitudinal direction (that is, the position adjustment direction D2) of the mounting portion side mounting hole 275 is the boom longitudinal direction Xb or substantially the boom longitudinal direction Xb.

[0086] The position adjustment mechanism 280 is configured to make the position of the restricting portion 273 with respect to the boom 13 variable in the longitudinal direction of the mounting portion side mounting hole 275 (that is, the position adjustment direction D2), so that the pin mounting position P1 is variable in the position adjustment direction D2. The position adjustment mechanism 280 may make the position of the guide portion 71 variable in the position adjustment direction D2. For example, the position adjustment mechanism 280 includes a guide fulcrum member mounting hole 286 and a fixing member mounting hole 287. The guide fulcrum member 66 and the guide fixing member 67 may be used as components of the position adjustment mechanism 280.

[0087] The guide fulcrum member mounting hole 286 is an elongated hole that is long in the longitudinal direction of the mounting portion side mounting hole 275 (i.e., the position adjustment direction D2) (the same applies to the fixed member mounting hole 287). The longitudinal direction of the guide fulcrum member mounting hole 286 is parallel or substantially parallel to the longitudinal direction of the mounting portion side mounting hole 275 (the same applies to the fixed member mounting hole 287). In the example shown in FIG. 7, the longitudinal direction of the guide fulcrum member mounting hole 286 is the boom longitudinal direction Xb or substantially the boom longitudinal direction Xb (the same applies to the fixed member mounting hole 287). The guide fulcrum member mounting hole 286 is provided (formed) in at least one of the fixed frame 261 and the guide frame 265 (the same applies to the fixed member mounting hole 287). In the example shown in FIG. 7, the guide fulcrum member mounting hole 286 is provided in the fixed frame 261 (the same applies to the fixed member mounting hole 287). The guide fulcrum member 66 and the guide fixing member 67 fix the guide frame 265 to the fixed frame 281. Incidentally, when the mounting portion side mounting hole 275 is an elongated hole, the guide frame 65 may be movable in the position adjustment direction D2 shown in FIG. 7 with respect to the fixed frame 61 by a structure such as the concave portion 81b and the convex portion 81a shown in FIG. 3, for example.

[0088] (Position adjustment) The position adjustment of the pin mounting position P1 in the position adjustment direction D2 by the position adjustment mechanism 280 is performed as follows, for example. The undulating rope 18 is loosened and the upper spreader 30 is lowered. For example, even if the undulating rope 18 is loosened, the upper spreader 30 is not further lowered. In this state, the regulating part 273 (the guide frame 265) is moved in the position adjustment direction D2. At this time, as shown in FIG. 8, the position of the regulating part 273 is adjusted so that the guided part 40 comes into contact with the regulating part 273. More specifically, the position of the guide frame 265 is adjusted so that the guided part 40 comes into contact with the guide part 71 and the regulating part 273. At this time, the guide fulcrum member 66 moves along the guide fulcrum member mounting hole 286. The guide fixing member 67 moves along the fixing member mounting hole 287. In the state where this position adjustment has been performed, the regulating part 273 (the guide frame 265) is positioned with respect to the fixed frame 261. Specifically, for example, by tightening the bolts and nuts constituting the guide fulcrum member 66, the movement of the guide frame 265 in the position adjustment direction D2 is restricted. Further, when the guide fixing member 67 is inserted into the fixing member mounting hole 287, the rotation of the guide frame 65 about the guide fulcrum member 66 is restricted.

[0089] (Guide by the guide part 71) The case where the upper spreader 30 is lowered in the state where the position adjustment of the pin mounting position P1 in the position adjustment direction D2 by the position adjustment mechanism 280 has been performed will be described. When the guided part 40 moves downward along the guide part 71 and comes into contact with the regulating part 273, the movement of the guided part 40 in the inclination direction D1 (see FIG. 7) is restricted. At this time, the positions of the upper spreader side mounting hole 35 and a part of the mounting part side mounting hole 275 which is an elongated hole are aligned. Therefore, it becomes possible to insert the mounting pin 90 into the upper spreader side mounting hole 35 and the mounting part side mounting hole 275. When the mounting pin 90 is inserted into the upper spreader side mounting hole 35 and the mounting part side mounting hole 275, the upper spreader 30 is connected to the mounting part 250.

[0090] (Lifting of the boom 13) When the upper spreader 30 is attached to the attachment portion 250 and the undulating rope 18 shown in FIG. 1 is wound up by the undulating winch 17, the boom 13 may be raised. The operation of the upper spreader attachment device 220 shown in FIG. 8 in this case is as follows, for example. When the undulating rope 18 is wound up while the guide frame 265 remains fixed to the fixed frame 261, the guided portion 40 may be pressed against the guide portion 71, and the guided portion 40 and its peripheral portions may be damaged. Therefore, before the undulating rope 18 is wound up, the fixing of the guide frame 265 to the fixed frame 261 is released. Specifically, for example, when the guide fulcrum member 66 includes nuts and bolts, the guide fulcrum member 66 is loosened. Then, with the fixing of the guide frame 65 to the fixed frame 61 released, the undulating winch 17 winds up the undulating rope 18. Then, the upper spreader 30 moves in the longitudinal direction (position adjustment direction D2) of the attachment portion side attachment hole 275 and moves toward the boom base end side Xb2. Then, the attachment pin 90 contacts the end portion in the longitudinal direction of the attachment portion side attachment hole 275 (more specifically, the end portion on the boom base end side Xb2). In this state, the boom 13 is pulled up (see FIG. 1). Therefore, it is possible to prevent the guided portion 40 from being pressed against the guide portion 71. When the strength of the guided portion 40 and its peripheral portions can be ensured, the boom 13 may be pulled up with the guided portion 40 pressed against the guide portion 71.

[0091] (Effect of the Fourth Invention) [Configuration 4] As shown in FIG. 7, the attachment portion side attachment hole 275 is an elongated hole that is long in the position adjustment direction D2. The attachment portion 250 is configured such that the position of the restricting portion 273 with respect to the boom 13 is variable in the longitudinal direction (position adjustment direction D2) of the attachment portion side attachment hole 275, so that the pin attachment position P1 is variable in the position adjustment direction D2.

[0092] In the above [Configuration 4], the position of the pin attachment position P1 is adjusted by adjusting the position of the regulating part 273 in the position adjustment direction D2. As a result, as shown in FIG. 8, the position of the upper spreader side attachment hole 35 when the guided part 40 contacts the regulating part 273 is adjusted in the position adjustment direction D2. Therefore, the position where the upper spreader side attachment hole 35 can be arranged when the guided part 40 contacts the regulating part 273 is not a specific single position, but has a long range in the position adjustment direction D2. And in the above [Configuration 4], the attachment part side attachment hole 275 is an elongated hole that is long in the position adjustment direction D2. Therefore, in a state where the position of the regulating part 273 is adjusted in the position adjustment direction D2, the positions of a part of the attachment part side attachment hole 275 and the upper spreader side attachment hole 35 can be easily aligned. Therefore, the attachment pin 90 can be easily attached to the attachment part side attachment hole 275 and the upper spreader side attachment hole 35.

[0093] (Third Embodiment) Referring to FIGS. 9 to 10, the differences between the upper spreader attachment device 320 (mainly the attachment part 350) of the third embodiment and the second embodiment will be described.

[0094] In the example shown in FIG. 7, the position adjustment direction D2 of the pin attachment position P1 by the position adjustment mechanism 280 was substantially the boom longitudinal direction Xb. As shown in FIG. 9, in the present embodiment, the position adjustment direction D2 of the pin attachment position P1 by the position adjustment mechanism 380 is parallel or substantially parallel to the inclination direction D1. More specifically, the position adjustment mechanism 380 is configured such that the position of the regulating part 273 with respect to the boom 13 is variable in the inclination direction D1 of the guide part 71, so that the pin attachment position P1 is variable in the position adjustment direction D2. The position adjustment mechanism 380 may make the position of the guide part 71 variable in the position adjustment direction D2. For example, the position adjustment mechanism 380 includes a guide fulcrum member attachment hole 386 and a fixing member attachment hole 387.

[0095] In the example shown in FIG. 7, the direction of each elongated hole of the mounting portion side mounting hole 275, the guide fulcrum member mounting hole 286, and the fixing member mounting hole 287 was, for example, substantially the boom longitudinal direction Xb. As shown in FIG. 9, in the present embodiment, the direction of each elongated hole of the mounting portion side mounting hole 375, the guide fulcrum member mounting hole 386, and the fixing member mounting hole 387 is parallel or substantially parallel to the inclination direction D1.

[0096] (Guide by guide portion 71) The case where the upper spreader 30 is lowered in a state where the position adjustment mechanism 380 adjusts the position of the pin mounting position P1 in the position adjustment direction D2 will be described. It is assumed that the guided portion 40 has moved (been guided) along the guide portion 71 and has stopped without contacting the restricting portion 273. Here, the mounting portion side mounting hole 375 is an elongated hole that is long in the inclination direction D1 of the guide portion 71. Therefore, even when the guided portion 40 stops without contacting the restricting portion 273, the mounting pin 90 can be inserted into the mounting portion side mounting hole 375 and the upper spreader side mounting hole 35.

[0097] (Lifting of boom 13) The case where the boom 13 is raised with the upper spreader 30 attached to the mounting portion 350 will be described. In the second embodiment, the undulation rope 18 was wound up and the boom 13 was raised with the fixing of the guide frame 265 to the fixed frame 261 shown in FIG. 8 released. On the other hand, in the present embodiment, the undulation rope 18 may be wound up with the guide frame 265 fixed to the fixed frame 261 shown in FIG. 10. More specifically, even when the guide frame 265 is fixed to the fixed frame 261, when the undulation rope 18 is wound up, the mounting pin 90 moves along the mounting portion side mounting hole 375 to the upper side Zb1 of the boom. At this time, the guided portion 40 can smoothly move in the inclination direction D1 along the guide portion 71 without being strongly pressed against the guide portion 71. Then, the boom 13 is pulled up in a state where the mounting pin 90 contacts the longitudinal end of the mounting portion side mounting hole 375 (more specifically, the end on the upper side Zb1 of the boom).

[0098] (Effect of the Fifth Invention) [Configuration 5] As shown in FIG. 9, the mounting portion side mounting hole 375 is an elongated hole that is long in the inclination direction D1 of the guide portion 71.

[0099] According to the above [Configuration 5], the following effect can be obtained. When the upper spreader 30 is lowered and the guided portion 40 moves along the guide portion 71 in the inclination direction D1, the guided portion 40 may stop without contacting the restricting portion 273. Even in such a case, in the above [Configuration 5], since the mounting portion side mounting hole 375 is an elongated hole that is long in the inclination direction D1 of the guide portion 71, the mounting pin 90 (see FIG. 10) can be easily inserted into the mounting portion side mounting hole 375 and the upper spreader side mounting hole 35.

[0100] Also, according to the above [Configuration 5], the following effect can be obtained. As shown in FIG. 10, when the boom 13 is pulled up with the upper spreader 30 attached to the mounting portion 350. In this case, when trying to pull up the boom 13, the mounting pin 90 moves in the longitudinal direction of the mounting portion side mounting hole 375, that is, in the inclination direction D1 of the guide portion 71. Therefore, as a result of the upper spreader 30 moving in the inclination direction D1, the guided portion 40 moves in the inclination direction D1. Thus, it is possible to suppress the guided portion 40 from being strongly pressed against the guide portion 71. And the boom 13 can be pulled up with the mounting pin 90 in contact with the end portion in the longitudinal direction of the mounting portion side mounting hole 375. Therefore, even without making the guide portion 71 movable with respect to the boom 13, the boom 13 can be pulled up with the mounting pin 90 in contact with the end portion in the longitudinal direction of the mounting portion side mounting hole 375.

[0101] (Modification) The above embodiments may be variously modified. For example, components of different embodiments may be combined with each other. For example, the arrangement and shape of each component may be changed. For example, the number of components may be changed, and some of the components may not be provided. For example, the fixing and connection of components may be direct or indirect. For example, what has been described as a plurality of different members or parts may be made into one member or part. For example, what has been described as one member or part may be divided and provided as a plurality of different members or parts.

Explanation of Reference Numerals

[0102] 1 Crane 13 Boom (lifting member) 14 Gantry (lifting member) 20, 220, 320 Upper spreader mounting device 30 Upper spreader 40 Guided part 50, 250, 350 Mounting part 61 Fixed frame 63 Movable frame 71 Guide part 73, 273 Regulation part 75, 275, 375 Mounting part side mounting hole 81a Protrusion 81b Recess 85 Positioning member 90 Mounting pin D1 Tilt direction D2 Position adjustment direction P1 Pin mounting position Xb Boom longitudinal direction (longitudinal direction of lifting member) Yb Boom transverse direction (transverse direction of lifting member) Zb Boom height direction (height direction of lifting member)

Claims

1. An upper spreader mounting device provided on a hoisting member of a crane, comprising: an upper spreader having an upper spreader side mounting hole; a mounting portion provided on the hoisting member, capable of mounting the upper spreader, and having a mounting portion side mounting hole; a mounting pin inserted into the upper spreader side mounting hole and the mounting portion side mounting hole to connect the upper spreader to the mounting portion; and the mounting portion is configured to be variable in a position adjustment direction which is a direction including at least one of the height direction and the longitudinal direction of the hoisting member, the position adjustment direction being the position where the mounting pin is mounted to the mounting portion side mounting hole; the upper spreader includes a guided portion; the mounting portion is capable of contacting the guided portion, and has a guide portion for guiding the guided portion along an inclination direction which is a direction inclined with respect to the longitudinal direction of the hoisting member when viewed from the lateral direction of the hoisting member; is capable of contacting the guided portion, and has a restricting portion for restricting the movement of the guided portion in the inclination direction; and the mounting portion side mounting hole is arranged at a position where the mounting pin can be inserted into the upper spreader side mounting hole and the mounting portion side mounting hole when the guided portion contacts the guide portion and the restricting portion; the mounting portion is configured to make the pin mounting position variable in the position adjustment direction by making at least one of the restricting portion and the position of the mounting portion side mounting hole with respect to the hoisting member variable in the position adjustment direction; an upper spreader mounting device.

2. The upper spreader mounting device according to Claim 1, wherein the mounting portion includes a fixed frame fixed to the hoisting member; a movable frame movable with respect to the fixed frame and having the mounting portion side mounting hole formed therein; a convex portion provided on one of the fixed frame and the movable frame; a concave portion provided on the side different from the side on which the convex portion is provided among the fixed frame and the movable frame, and attached to the convex portion so as to be relatively movable in the position adjustment direction; and a positioning member inserted into the fixed frame and the movable frame to fix the position of the movable frame with respect to the fixed frame; and an upper spreader mounting device.

3. The upper spreader mounting device according to Claim 1, wherein the mounting portion side mounting hole is an elongated hole long in the position adjustment direction. The mounting portion is configured such that the position of the restricting portion with respect to the undulating member is variable in the longitudinal direction of the mounting portion side mounting hole, so that the pin mounting position is variable in the position adjustment direction. Upper spreader mounting device.

4. The upper spreader mounting device according to claim 3, wherein The mounting portion side mounting hole is an elongated hole that is long in the inclined direction of the guide portion. Upper spreader mounting device.

5. The upper spreader mounting device according to any one of claims 1 to 4, wherein The mounting portion is provided on both lateral portions of the undulating member. Upper spreader mounting device.

6. A method for mounting an upper spreader, which comprises mounting the upper spreader mounting device according to any one of claims 1 to 4 on the undulating member, wherein The mounting portion is provided on both lateral portions of the undulating member, When the upper spreader is brought closer to the mounting portion from above the mounting portion, the pin mounting positions of the respective mounting portions provided on both lateral portions of the undulating member are individually adjusted so that the guided portion contacts the guide portion. Method for mounting an upper spreader.

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