Pendant rope fixing device and crane

Abstract

To provide a pendant rope fixing device capable of easily fixing a pendant rope to a boom.SOLUTION: A pendant rope fixing device (60) is a fixing device for a pendant loop enabling fixing of a pendant rope (22) to a boom (4b), and comprises: a first engagement part (63) that engages with the first end (222) of the pendant rope (22), the first engagement part (63) being displaceable in the longitudinal direction of the boom (4b); and a reception part (622) against which a part closer to the center of the pendant rope than the first end abuts in a state where the first end is engaged with the first engagement part.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a fixing device for a pendant rope.

Background Art

[0002] Patent Document 1 describes fixing a pendant rope to a boom during transportation of a crane. In this technique, both ends of the pendant rope are fixed to pin holes of brackets provided at both ends of the boom via pins.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When fixing the pendant rope, the pendant rope may sag due to its own weight. In this case, it becomes difficult to align the pin hole of the bracket with the end of the pendant rope. And the work of moving the heavy pendant rope to align the ends requires a great deal of labor.

[0005] An object of the present invention is to provide a fixing device for a pendant rope that can more easily fix the pendant rope to a boom.

Means for Solving the Problems

[0006] The fixing device for a pendant rope according to the present invention is a fixing device for a pendant rope that enables the pendant rope to be fixed to a boom, comprising a first engaging portion that engages with a first end of the pendant rope, wherein the first engaging portion is displaceable in the longitudinal direction of the boom, In a state where the first end portion is engaged with the first engaging portion, a receiving portion is provided against which a portion closer to the center of the pendant rope than the first end portion abuts.

Advantages of the Invention

[0007] According to the present invention, the pendant rope can be more easily fixed to the boom.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Modes for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this specification, each direction of the boom 4 is referred to as the "longitudinal direction", "width direction", and "thickness direction". The longitudinal direction corresponds to the longitudinal direction of the boom 4, the width direction corresponds to the left - right direction when the boom is laid down at a horizontal angle and viewed in the longitudinal direction, and the thickness direction corresponds to the up - down direction when the boom is laid down at a horizontal angle.

[0010] Also, in this specification, one side and the other side of the longitudinal direction of the boom 4 are represented as "above and below in the longitudinal direction". Above and below in the longitudinal direction means above and below when the boom 4 is erected. Also, one side and the other side of the thickness direction of the boom 4 are represented as "above and below in the thickness direction". Above and below in the thickness direction means above and below when the boom 4 is laid down at a horizontal angle. Laying down the boom 4 at a horizontal angle means that the frame member on the upper side in the thickness direction of the boom 4 is horizontal. The upper side, when the boom is composed of frame members of a truss structure, corresponds to the upper end of the frame member. The upper side, when the boom is a box member, corresponds to the upper surface of the box. In this embodiment, the upper side is located above the skywalk 51.

[0011] Also, the state in which the crane 1 can be transported between the machine yard and the construction site is called the "transport state of the crane 1" or simply the "transport state", and the state in which the crane 1 can perform the load - carrying operation is called the "working state of the crane 1" or simply the "working state".

[0012] <Configuration of the Crane> FIG. 1 is a diagram showing the crane of this embodiment, where (a) shows the first step when fixing the pendant rope, and (b) shows the second step when fixing the pendant rope.

[0013] The crane 1 according to an embodiment of the present invention is a crawler crane capable of self-propelling, and includes a travelable lower traveling body 2, an upper slewing body 3 provided so as to be slewing relative to the lower traveling body 2, a boom 4 connected to the upper slewing body 3 so as to be able to undulate, a live mast 6 supporting the boom 4, a pendant rope 20 connecting the live mast 6 and the boom 4, a winch (not shown) for winding or unwinding a wire rope W1, and a counterweight 9 mounted on the rear part of the upper slewing body 3. A cab 8 for a driver to drive is mounted on the upper slewing body 3.

[0014] The boom 4 is configured by connecting a plurality of decomposable parts. That is, the boom 4 includes a lower boom 4a, an intermediate boom 4b, and an upper boom 4c, and is connected in this order from the side closer to the upper slewing body 3. In the example of FIG. 1, the boom 4 includes one intermediate boom 4b, but may be configured to include a plurality of intermediate booms 4b.

[0015] When transporting the crane 1 between the machine yard and the site, the boom 4 is removed from the upper slewing body 3 and transported in a state of being disassembled into each part (4a to 4c).

[0016] The pendant rope 20 includes two pendant ropes 20 arranged apart in the width direction of the boom 4 (see FIG. 2(b)). Note that the number of pendant ropes 20 connecting the live mast 6 and the boom 4 may be one, or may be three or more. Hereinafter, one of the plurality of pendant ropes 20 will be described, but the other pendant ropes 20 among the plurality of pendant ropes 20 have the same configuration.

[0017] As shown in Fig. 1(b), the pendant rope 20 is configured to be separable into a plurality of parts corresponding to each part (4a to 4c) of the boom 4. For example, the pendant rope 20 is separable into an intermediate pendant rope 22 corresponding to the intermediate boom 4b, a lower pendant rope 21 connected to the lower side of the boom 4 in the longitudinal direction, and an upper pendant rope 23 connected to the upper side of the boom 4 in the longitudinal direction. At the ends of the pendant ropes 21, 22, and 23 of each part, pin joints 222 and 223 that can be pin-connected to each other are provided, and the ends are configured to be pin-connected via the pin joints 222 and 223.

[0018] When disassembling and transporting the boom 4, the plurality of separated pendant ropes 21 to 23 are respectively fixed to each of the booms 4a to 4c separated by parts. Hereinafter, the fixing structure between the intermediate boom 4b and the intermediate pendant rope 22 will be described, but the same structure may be applied as the structure for fixing the pendant ropes 21 and 23 to the upper or lower booms 4a and 4c, respectively.

[0019] <Fixing Structure between Boom 4b and Pendant Rope 22> Fig. 2 is a view showing the boom 4b to which the fixing device 60 is attached, (a) is a side view thereof, (b) is a plan view in the transport state, and (c) is a plan view in the working state. Fig. 2(a) is a schematic view, and the line segment Lu indicates the upper side in the thickness direction of the boom 4b.

[0020] A fixing device 60 for the pendant rope 22 is attached to the boom 4b. The fixing device 60 includes a lower fixing device 61 attached to the lower side in the longitudinal direction of the boom 4b and an upper fixing device 65 attached to the upper side in the longitudinal direction of the boom 4b. The lower fixing device 61 and the upper fixing device 65 are respectively attached to a frame member 41 on the lower side in the longitudinal direction and the upper side in the thickness direction of the boom 4b and a frame member 42 on the upper side in the longitudinal direction and the lower side in the thickness direction of the boom 4b. The frame members 41 and 42 are frame members extending in the width direction of the boom 4 and are also called picture members.

[0021] <Lower Fixing Device> Figures 3 and 4 are diagrams showing the lower fixing device 61. Figure 3 represents the transport state, and Figure 4 represents the working state.

[0022] The lower fixing device 61 has a first engaging portion 63 that engages with one end portion (corresponding to the first end portion, pin joint 222) of the pendant rope 22, and a base portion 64 that supports the first engaging portion 63 so as to be displaceable. The base portion 64 is fastened to the frame member 41 of the boom 4b via a connecting member (such as a U-bolt) 621.

[0023] Specifically, the first engaging portion 63 has a pair of bifurcated pieces 631a and 631b that face both side surfaces of the pin joint 222 having one pin hole, and pin holes 632a and 632b provided in the respective pieces 631a and 631b. Then, by passing the connecting pin p1 through the pin hole 632a of one piece 631a, the pin hole of the pin joint 222, and the pin hole 632b of the other piece 631b, and assembling a retaining means for preventing the connecting pin p1 from coming off, the first engaging portion 63 and the pin joint 222 of the pendant rope 22 are engaged so as to be swingable about the connecting pin p1. By the engagement by the connecting pin p1, it is possible to suppress the one end portion (pin joint 222) of the pendant rope 22 from largely moving in the width direction of the boom 4b during the transport state.

[0024] The lower fixing device 61 has a structure that enables the first engaging portion 63 to be displaced in the longitudinal direction of the boom 4b. With this structure, when the pendant rope 22 is fixed to the fixing device 60, even if a part of the pendant rope 22 lies on the diagonal member 43 or the defrooler 44 of the boom 4b and the other part bends, causing the pin joint 222 to deviate from the specified position, the first engaging portion 63 can be displaced in the longitudinal direction of the boom 4b, so that the displaced pin joint 222 and the first engaging portion 63 can be easily connected. Therefore, the work of fixing the pendant rope 22 becomes easier. The defrooler 44 is a roller that guides a hoisting rope or the like in the working state.

[0025] The structure for displacing the first engagement portion 63 in the longitudinal direction of the boom 4b is realized in detail by a structure that swingably supports the first engagement portion 63 with respect to the base portion 64. This structure may be called a link mechanism. More specifically, the base sides of the bifurcated parts 631a and 631b are connected to the base portion 64 via a connection pin 636. Then, by swinging the parts 631a and 631b about the connection pin 636, the first engagement portion 63 is displaced in the longitudinal direction of the boom 4b.

[0026] The lower fixing device 61 also has a structure that enables the first engagement portion 63 to be displaced in the thickness direction of the boom 4b. Specifically, this structure is realized by the aforementioned link mechanism. That is, by swinging the parts 631a and 631b about the connection pin 636, the first engagement portion 63 is also displaced in the thickness direction of the boom 4b. The first engagement portion 63 can be displaced from a position exposed above the upper side in the thickness direction of the boom 4b to a position hidden below the upper side. The link mechanism can easily realize a structure that enables the first engagement portion 63 to be displaced in both the thickness direction and the longitudinal direction of the boom 4b. In the lower fixing device 61, the structure that enables the first engagement portion 63 to be displaced in both the thickness direction and the longitudinal direction of the boom 4b may be realized by two slide mechanisms, or by a composite structure of a link mechanism and a slide mechanism, or by various other mechanisms.

[0027] The first engagement portion 63 is supported by the base portion 64 so as to be restrained from displacement in the width direction of the boom 4b. According to this configuration, when fixing the pendant rope 22 and in the transport state, it is possible to suppress the first engagement portion 63 from being displaced more than necessary in the width direction of the boom 4b.

[0028] The lower fixing device 61 has a structure that locks the first engaging portion 63 to the base portion 64 in a state where the first engaging portion 63 is located below the boom 4b in the thickness direction. Specifically, this structure includes pin holes (corresponding to the fixing portions) 634a and 634b provided in the one-piece portions 631a and 631b, and a pin hole 644 provided in the base portion 64, and is realized by a configuration in which the pin holes 634a, 634b, and 644 are aligned in a straight line in the working state. Then, with the pin holes 634a, 634b, and 644 aligned in a straight line, the connecting pin p1 is passed therethrough, so that the displacement of the first engaging portion 63 in the working state can be suppressed. In a state where the pin holes 634a, 634b, and 644 are aligned in a straight line, the first engaging portion 63 comes to a position hidden below the upper side in the thickness direction of the boom 4b. The connecting pin p1 may be diverted from the one that connects the pendant rope 22 to the first engaging portion 63 in the transport state, or may be separate parts. By diverting, waste is saved and the loss of the connecting pin p1 can be suppressed. Note that the pin holes 634a and 634b do not necessarily have to be provided in the lower fixing device 61 itself.

[0029] Although not shown in the figure, the first engaging portion 63 may have a structure that sandwiches one end portion of the pendant rope 22 and fixes the one end portion by frictional force. In this structure, when a force greater than the above frictional force is applied to the pendant rope 22, the pendant rope 22 may be displaced relative to the first engaging portion 63. In this case, the pendant rope 22 may be damaged.

[0030] On the other hand, the structure fixed via the connecting pin p1 described above has the following advantages compared with the structure fixed by the above frictional force. That is, it is possible to reduce the damage to the pendant rope 22 even if the first engaging portion 63 is displaced, and one end portion of the pendant rope 22 can swing relative to the first engaging portion 63 to an extent that allows the displacement of the first engaging portion 63.

[0031] One end of the pendant rope 22 with which the first engaging portion 63 engages is a pin joint 222. The pin joint 222 is a portion where the pendant rope 22 is pin-connected to an adjacent pendant rope 21. According to this configuration, one end of the pendant rope 22 can be firmly and stably fixed to the lower fixing device 61. Also, the risk of damaging the pendant rope 22 is reduced, and one end of the pendant rope 22 can be appropriately swung around the connection pin p1.

[0032] A dedicated pin may be applied as the connection pin p1. When applying a dedicated pin, the diameter may be made smaller than that of the pin connecting the pendant ropes 21 and 22. The smaller diameter facilitates the operation of inserting the pin. Also, when applying a dedicated pin, the connection pin p1 should be configured to be held by the base portion 64 when the crane 1 is in the working state. In the present embodiment, a dedicated pin is applied as the connection pin p1. The connection pin p1 also functions as a connection pin p1 (see FIGS. 4(a) and 4(b)) that locks the first engaging portion 63 to the base portion 64 at a position where the first engaging portion 63 is hidden below the upper side in the thickness direction of the boom 4 when the crane 1 is in the working state.

[0033] More specifically, the connection pin p1 used for engagement at the first engagement portion 63 has a smaller diameter than the pins connecting the pendant ropes 21 and 22, and in the state during the operation of the crane 1 (when the first engagement portion 63 is stored), it may also be used as the pin for fixing the first engagement portion 63. Further, the connection pin p2 used for engagement at the second engagement portion 67 described later may be used in combination with the pins connecting the pendant ropes 21 and 22 (corresponding to the connection member capable of connecting the other pendant rope 22), and may be separate from the pin for fixing the second engagement portion 67 during the operation of the crane 1 (when the second engagement portion 67 is stored). In this way, by using only one connection pin for both the first engagement portion 63 and the second engagement portion 67 in combination with the pins connecting the pendant ropes 21 and 22, the pins for connecting the pendant ropes 21 and 22 can be diverted without excess or deficiency. For example, if the connection pins p1 and p2 are used in combination as described above for both the first engagement portion 63 and the second engagement portion 67, four connection pins are required for the two pendant ropes 22, so it is necessary to prepare extra connection pins.

[0034] The first engagement portion 63 is made swingable with respect to the base portion 64 around the connection pin 636 even in the transport state of the crane 1. With this configuration, even if the pendant rope 22 is stretched during transportation, it is possible to suppress an excessive force from being applied to the fixing device 60.

[0035] The lower fixing device 61 has a receiving portion 622 against which the pendant rope 22 engaged with the first engagement portion 63 abuts. The receiving portion 622 is a semi-cylindrical plate material that covers a part of the circumferential surface of the frame member 41 of the boom 4b to which the base portion 64 is fastened. The receiving portion 622 is sandwiched and fixed between the connecting member (U-bolt) 621 and the frame member 41 of the boom 4b. The receiving portion 622 covers the upper side of the frame member 41 in the thickness direction of the boom 4b.

[0036] The first engaging portion 63 is located below the frame member 41 to which the base portion 64 is fastened in the longitudinal direction of the boom 4b. Therefore, the pendant rope 22 having one end engaged with the first engaging portion 63 will crawl along the side of the frame member 41 (see FIGS. 3(a) and 3(b)). Thus, due to the presence of the receiving portion 622, the portion closer to the center of the pendant rope 22 fixed to the fixing device 60 abuts against the receiving portion 622. Therefore, compared with the configuration in which the pendant rope 22 directly abuts against the frame member 41, it is possible to reduce the damage to the frame member 41. Also, the receiving portion 622 stabilizes the position of the pendant rope 22 in the transport state. Further, since it is possible to arrange the pendant rope 22 without damaging the frame member 41, it becomes easy to arrange the one end portion of the pendant rope 22 at an appropriate position before fixing the one end portion to the first engaging portion 63. Furthermore, by placing the pendant rope 22 on the receiving portion 622, approximate alignment between the one end portion of the pendant rope 22 and the first engaging portion 63 is achieved. Therefore, the engagement between the one end portion of the pendant rope 22 and the first engaging portion 63 becomes easy. Further, since the position of the pendant rope 22 is stabilized by the receiving portion 622 in the transport state, an excessive force is less likely to be applied between the one end portion (pin joint 222) of the pendant rope 22 and the first engaging portion 63. Therefore, it also becomes easy to remove the one end portion of the pendant rope 22 from the first engaging portion 63.

[0037] <Upper fixing device> FIGS. 5 and 6 are views showing the upper fixing device 65. FIG. 5 represents the transport state, and FIG. 6 represents the working state.

[0038] The upper fixing device 65 has a second engaging portion 67 that engages with the other end portion of the pendant rope 22 (corresponding to the second end portion: bifurcated pin joint 223), and a base portion 68 that supports the second engaging portion 67 so as to be displaceable. The base portion 68 is fastened to the frame member 42 of the boom 4b via a connecting member (such as a U-bolt) 661. With this configuration, the fixing position of the upper fixing device 65 can be moved relatively freely in the longitudinal direction of the frame member 42. Further, since the lower fixing device 61 and the upper fixing device 65 are independently fixed to the frame members 41 and 42, respectively, the positions of the lower fixing device 61 and the upper fixing device 65 can be easily adjusted according to the arrangement of the pendant rope 22.

[0039] Specifically, the second engaging portion 67 has two pieces 671a and 671b that can enter between the bifurcated pin joints 223, and pin holes 673a and 673b provided in the respective pieces 671a and 671b. Then, by passing the connecting pin p2 through one pin hole of the bifurcated pin joint 223, the pin holes 673a and 673b of the two pieces 671a and 671b, and the other pin hole of the bifurcated pin joint 223 and assembling a retaining means, the second engaging portion 67 and the pin joint 223 of the pendant rope 22 are engaged so as to be swingable about the connecting pin p2. By the engagement by the connecting pin p2, it is possible to suppress the other end portion (pin joint 223) of the pendant rope 22 from moving greatly in the width direction of the boom 4b during the transportation state.

[0040] The upper fixing device 65 has a structure that enables the second engaging portion 67 to be displaced in the thickness direction of the boom 4b. With this structure, by displacing the second engaging portion 67 upward in the thickness direction in the transport state, the workability of fixing the pendant rope 22 and the second engaging portion 67 can be improved. Also, in the working state, by displacing the second engaging portion 67 downward in the thickness direction, it is possible to prevent the second engaging portion 67 from interfering with the operation of the crane 1. The second engaging portion 67 may be displaceable from a position above the upper side in the thickness direction of the boom 4b to a position below the upper side. With this configuration, the effect of improving the workability of the above fixing and the effect of suppressing interference with the operation of the crane 1 can be further enhanced. As factors that interfere with the operation of the crane 1, there are factors such as when an operator moves on the boom 4 in a horizontal state of the boom 4, an object protruding from the boom 4 may become an obstacle to movement, and a wire rope located near the boom 4 such as a hoisting rope may be caught by an object protruding from the boom 4.

[0041] The structure for displacing the second engaging portion 67 in the thickness direction of the boom 4b is specifically realized by a structure (slide mechanism) that supports the second engaging portion 67 so as to be translatable with respect to the base portion 68. More specifically, a part of the second engaging portion 67 is a rectangular parallelepiped-shaped body portion, and a frame portion 680 that surrounds the body portion 670 from four sides is provided. With this structure, the body portion 670 slides along the frame portion 680, whereby the second engaging portion 67 is displaced in the thickness direction. Note that the structure for displacing the second engaging portion 67 in the thickness direction of the boom 4b is not limited to the above structure, and various structures such as a link mechanism may be applied, or a structure in which displacement of other direction components is included in the displacement of the second engaging portion 67 may also be applied.

[0042] The upper fixing device 65 has a structure that suppresses displacement of the second engaging portion 67 other than in the thickness direction of the boom 4b. This structure is realized by the above detailed structural example. With this configuration, it is possible to prevent the pendant rope 22 fixed to the fixing device 60 from moving more than necessary.

[0043] Although illustration is omitted, the second engaging portion 67 may have a structure that sandwiches the other end portion of the pendant rope 22 and fixes the one end portion by frictional force. In this structure, when a force greater than the above frictional force is applied to the pendant rope 22, the pendant rope 22 may be displaced relative to the second engaging portion 67. In this case, the pendant rope 22 may be damaged.

[0044] On the other hand, the structure fixed via the connection pin p2 described above has the following advantages as compared with the structure fixed by the above frictional force. That is, even if the second engaging portion 67 is displaced, it is possible to reduce damage to the pendant rope 22, and the other end portion of the pendant rope 22 can swing relative to the second engaging portion 67 to the extent that the displacement of the second engaging portion 67 is allowed.

[0045] The other end portion of the pendant rope 22 with which the second engaging portion 67 engages is the pin joint 223. The pin joint 223 is a portion where the pendant rope 22 is pin-connected to the adjacent pendant rope 23. According to this configuration, the other end portion of the pendant rope 22 can be firmly and stably fixed to the upper fixing device 65. In addition, the risk of damaging the pendant rope 22 is also reduced, and the other end portion of the pendant rope 22 can be appropriately swung around the connection pin p2.

[0046] The connection pin p2 may be a pin diverted from the pins connecting the pendant ropes 22 and 23, or a dedicated pin may be applied. When applying a dedicated pin, the diameter may be made smaller than the pins connecting the pendant ropes 22 and 23. By having a smaller diameter, the operation of inserting the pin becomes easier. Also, when applying a dedicated pin, when the crane 1 is in operation, the connection pin p2 may be configured to be held by the base portion 68. In the present embodiment, the connection pin p2 is a diverted pin from the pins connecting the pendant ropes 22 and 23.

[0047] The second engaging portion 67 is fixed in a state of being displaced upward in the thickness direction of the boom 4b in the transport state of the crane 1. The second engaging portion 67 is fixed in a state of being displaced downward in the thickness direction of the boom 4b in the working state of the crane 1. Such fixation can be realized by the following configuration. That is, a body portion 670 integrated with the second engaging portion 67 and a frame portion 680 that slidably surrounds the body portion are provided with holes 678, 679, 688 that communicate with each other, and a connecting pin 691 is passed through the holes and a retaining means is incorporated into the connecting pin 691. Thereby, the second engaging portion 67 can be locked so as not to move in the sliding direction. A plurality of holes 678, 679 having different positions in the sliding direction are provided in the body portion 670 integrated with the second engaging portion 67, and the second engaging portion 67 can be fixed at different positions depending on which hole the connecting pin 691 is passed through.

[0048] The upper fixing device 65 has a receiving portion 662 against which the pendant rope 22 engaged with the second engaging portion 67 abuts. The receiving portion 662 is a semi-cylindrical plate material that covers a part of the circumferential surface of the frame member 42 of the boom 4b to which the base portion 68 is fastened. The receiving portion 662 is sandwiched and fixed between a connecting member (U-bolt) 661 and the frame member 42 of the boom 4b. The receiving portion 662 covers the upper side of the frame member 42 in the thickness direction of the boom 4b.

[0049] The second engaging portion 67 is located above the frame member 42 to which the base portion 68 is fastened in the longitudinal direction of the boom 4b. Therefore, the pendant rope 22 having one end engaged with the second engaging portion 67 will crawl along the side of the frame member 42. Therefore, due to the presence of the receiving portion 662, the middle portion of the pendant rope 22 fixed to the fixing device 60 abuts against the receiving portion 662. Therefore, it is possible to reduce the damage to the frame member 42 as compared with the case where the pendant rope 22 directly abuts against the frame member 42. Further, the receiving portion 662 stabilizes the position of the pendant rope 22 in the transport state.

[0050] <Lower fixing device 61 and upper fixing device 65> The total number of pins connecting the pendant ropes 21 to 23 and the total number of connection pins p1 and p2 for fixing the pendant ropes 21 to 23 to the fixing device 60 are such that the latter is twice the former. Therefore, when diverting the pins for connecting the pendant ropes 21 to 23 as the connection pins p1 and p2, it is advisable to divert either one of them and use the other as a dedicated pin. In the present embodiment, the connection pin p1 of the lower fixing device 61 where the first engaging portion 63 is displaced in the longitudinal direction of the boom 4b is used as a dedicated pin, and the connection pin p2 of the upper fixing device 65 where the displacement of the boom 4b in the longitudinal direction of the second engaging portion 67 is suppressed is diverted and used as the pin for connecting the pendant ropes 21 to 23. According to this configuration, the connection pin p1, which is a dedicated pin, can be used to suppress the displacement of the first engaging portion 63 during the working state, and can be used to fix the pendant rope 22 during the transportation state, thereby realizing a component configuration with less waste.

[0051] The fixing device 60 has a structure in which a lower fixing device 61 capable of being displaced in the longitudinal direction of the boom 4b and having a first engaging portion 63 is attached to the lower part of the boom 4b in the longitudinal direction, and an upper fixing device 65 in which the change in the longitudinal direction of the boom 4b of the second engaging portion 67 is restricted is attached to the upper part of the boom 4b in the longitudinal direction. With such a configuration, the following effects are achieved. That is, when fixing the pendant rope 22 to the fixing device 60, as shown in FIGS. 1(a) and 1(b), the pendant rope 22 approaches the boom 4b from the upper side in the longitudinal direction of the boom 4b. Therefore, when fixing the pendant rope 22, it is possible to obtain good workability by fixing one end to the upper fixing device 65 and then fixing the other end to the lower fixing device 61. In this case, the position of the end is likely to shift due to the deflection of the pendant rope 22 or the like on the side where it is fixed to the lower fixing device 61. Therefore, if the first engaging portion 63 of the lower fixing device 61 is displaceable in the longitudinal direction of the boom 4b, it is possible to appropriately cope with the displacement of the above-mentioned end. Further, if the second engaging portion 67 of the upper fixing device 65 to which the pendant rope 22 is fixed is displaced in the longitudinal direction of the boom 4b, the displacement of the end of the pendant rope 22 on the side of the lower fixing device 61 may also increase accordingly. Therefore, since the displacement of the second engaging portion 67 in the longitudinal direction of the boom 4b is suppressed in the upper fixing device 65, it becomes easy to fix the pendant rope 22 to the lower fixing device 61.

[0052] <Detailed Structure 1 of Fixing Device 60> The fixing device 60 has a structure that can be attached to the boom 4b by being fastened to the frame members 41 and 42 of the boom 4b. For example, if the fixing device 60 is structured to be attached to the skywalk 51 (FIG. 2(b)), it is necessary to provide the skywalk 51 on the boom 4b. On the other hand, the fixing device 60 of the present embodiment can be attached to the boom 4b without the skywalk 51. The skywalk 51 is a structure for workers to walk provided on the upper surface in the thickness direction of the boom 4b.

[0053] <Detailed Structure 2 of Fixing Device 60> When the fixing device 60 is viewed in plan with the boom 4b horizontal, the line segments L2 and L3 connecting the corresponding pair of lower fixing devices 61 and upper fixing devices 65 are arranged such that both ends do not overlap the skywalk 51 (see Fig. 2(c)). According to this configuration, when the pendant rope 22 is fixed to the fixing device 60, it is possible to reduce the situation where the pendant rope 22 overlaps the skywalk 51. Therefore, when an operator walks on the skywalk 51, the possibility that the pendant rope 22 becomes an obstacle to walking is reduced. It is better if the entire line segments L1 and L2 are arranged so as not to overlap the skywalk 51, and the above-mentioned obstacle to walking can be further reduced.

[0054] <Detail structure 3 of fixing device 60> The fixing device 60 is attached in such an arrangement that the lengths of the line segments L1 and L2 connecting the corresponding pair of lower fixing devices 61 and upper fixing devices 65 are shorter than the pendant rope 22 when viewed in plan with the boom 4b horizontal (see Fig. 2(c)). In the transport state, the pendant rope 22 is arranged to rest on the diagonal member 43 or the defroiler 44 of the boom 4b. Therefore, the pendant rope 22 sags while resting on the diagonal member 43 or the defroiler 44 in the transport state. Therefore, with the above arrangement, it conforms to the sagging pendant rope 22, and the pendant rope 22 can be fixed more easily.

[0055] <Detail structure 4 of fixing device 60> The receiving part 622 of the lower fixing device 61 also serves as a fastening part to the boom 4b. That is, by fastening the receiving part 622 to the frame member 41, the lower fixing device 61 is attached to the boom 4b. Similarly, the receiving part 662 of the upper fixing device 65 also serves as a fastening part to the boom 4b. That is, by fastening the receiving part 662 to the frame member 42, the upper fixing device 65 is attached to the boom 4b. According to this structure, the receiving parts 622 and 662 can firmly and stably receive the pendant rope 22. Also, the receiving parts 622 and 662 are separable parts when the fastening is removed. With this structure, it becomes easy to replace only the receiving parts 622 and 662.

[0056] <Details of the fixing device 60 5> Fig. 7(a) is a side view of the lower fixing device 61. As shown in Fig. 7(a), a notch f1 is provided in the frame member 641 of the base portion 64 that swingably supports the first engaging portion 63. The notch f1 is a region below the hole portion 643 through which the connection pin 636 passes, and corresponds to a region obtained by removing the portion where the frame member 641 actually exists from the region where the peripheral portion of the hole portion 643 in the frame member 641 is extended downward to the bottom. The notch f1 may have a shape in which the frame member 641 is cut obliquely, or may have a shape in which it is cut in a stepped manner. Here, the up and down mean the up and down when the boom 4b is in a horizontal state (a state in which the frame member located on the upper side in the thickness direction of the boom 4b and extending in the longitudinal direction is horizontal). By having the notch f1 and in a state where the single portions 631a and 631b are fixed as shown in Fig. 7(b), the single portions 631a and 631b are displaced to a position closer to the base portion 64 side, so that the base portion 64 can be made smaller, and thus the lower fixing device 61 can be miniaturized.

[0057] Furthermore, in order to restrict the swing of the first engaging portion 63 in the working state, the pin hole 644 of the frame member 641 through which the connection pin p1 passes is provided in a range closer to the fastening portion (the receiving portion 622 and the connecting member 621) than the hole portion 643 that serves as the swing center in the longitudinal direction of the boom 4b.

[0058] With the above arrangement of the notch f1 and the pin hole 644, the center of gravity of the lower fixing device 61 can be brought closer to the fastening portion in the working state. Therefore, the rotational moment generated in the lower fixing device 61 due to vibrations during work or the like can be reduced, and the loosening of the fastening due to the rotational moment can be suppressed.

[0059] The base portion 64 is rotatable about the swing center of the first engagement portion 63, and the first engagement portion 63 is displaceable in the longitudinal direction and the thickness direction of the boom 4b by swinging about the swing center. The pin holes (fixed portions) 634a and 634b are provided at positions deviated from a line A64 (see Fig. 7(a)) connecting the above swing center and the pin hole of the first engagement portion 63. By deviating from the above line, the member itself can be made smaller, and the rotational moment is also reduced. Further, in the present embodiment, since the deviated position is on the base portion 64 side, the base portion 64 can also be made smaller.

[0060] <Details of the fixing device 60 6> Fig. 7(a) is a side view of the lower fixing device 61 in the transport state. As shown in Fig. 7(a), when one end (pin joint 222) of the pendant rope 22 is connected to the first engagement portion 63 and the pendant rope 22 is made horizontal at the height of the receiving portion 622, in the longitudinal direction of the boom 4b, the connection pin p1 is located on the opposite side of the fastening portion (receiving portion 622 and connecting member 621) from the connection pin 636 which is the swing center of the first engagement portion 63. With such a structure, even when a tension is generated in the fixed pendant rope 22 and the first engagement portion 63 is pulled, the first engagement portion 63 is swingable in the pulled direction. Therefore, it is possible to suppress the application of a large moment to the lower fixing device 61 and suppress the loosening of the fastening of the lower fixing device 61.

[0061] <Details of the fixing device 60 7> FIG. 8 shows a front view (a) and side views (b) and (c) of the upper fixing device 65. The upper fixing device 65 includes stoppers (corresponding to regulating portions) 675 and 676 that regulate the slide movement of the second engaging portion 67 at one end and the other end. Specifically, the stoppers 675 and 676 are provided on the side surface of the body portion 670 integrated with the second engaging portion 67, and by abutting against the frame portion 680, further slide movement is regulated. One stopper 675 is provided at a location that regulates the second engaging portion 67 at the working position. Thereby, it becomes possible to easily pass the connection pin 691 with the second engaging portion 67 in the working position. Similarly, the other stopper 676 is provided at a location that regulates the second engaging portion 67 at the transport position. Thereby, it becomes possible to easily pass the connection pin 691 with the second engaging portion 67 in the transport position.

[0062] <Detailed Structure 8 of Fixing Device 60> As shown in FIG. 7(a), in one part 631a, 631b of the first engaging portion 63, there are provided pin holes 632a, 632b for connecting one end portion (222) of the pendant rope 22, pin holes 633a, 633b through which a connection pin 636 serving as a swing center passes, and pin holes 634a, 634b for fixing the first engaging portion 63 at the working position. And the pin holes 634a, 634b for fixing at the working position are provided at a position outside the region f2 between the pin holes 633a, 633b of the swing center and the pin holes 632a, 632b of one end portion on the side surface. With such a configuration, compared with the configuration in which the three pin holes 632a to 634a are arranged in a row in one part 631a, the strength of the part 631a when the pendant rope 22 is fixed can be kept high. The same applies to the other part 631b.

[0063] The above describes each embodiment of the present invention. However, the present invention is not limited to the above embodiments. For example, in the above embodiment, the first engaging portion 63 of the lower fixing device 61 is displaceable in the longitudinal direction of the boom 4b, and the second engaging portion 67 of the upper fixing device 65 is configured to restrict displacement in the longitudinal direction of the boom 4b. However, the displaceable one in the longitudinal direction of the boom 4b may be reversed, or both may be configured to be displaceable in the longitudinal direction of the boom 4b.

[0064] Further, in the above embodiment, as a specific example of the first engaging portion 63, a configuration having two partial portions 631a and 631b was shown. However, the portion through which the connection pin 636 serving as the swing center of the first engaging portion 63 passes, the portion through which the connection pin p1 passes in the working state position, or both of these portions may not be divided into two partial portions 631a and 631b, and may have a block-like form with a thickness in the width direction. Also, in the above embodiment, the crawler crane was described as an example of the crane 1. However, the crane according to the present invention is applicable not only to other mobile cranes such as wheel cranes, truck cranes, rough terrain cranes, and all terrain cranes, but also to all cranes equipped with a boom and a pendant rope, such as tower cranes, overhead cranes, jib cranes, retractable cranes, stacker cranes, gantry cranes, and unloaders. In addition, the details shown in the embodiments can be appropriately changed without departing from the gist of the invention.

Explanation of Reference Numerals

[0065] 1 Crane 4, 4a~4c Boom 20, 21~23 Pendant Rope 222, 223 Pin Joint 60 Fixing Device 61 Lower Fixing Device 621 Connecting Member 622 Receiving Portion 63 First Engaging Portion 64 Base Portion 65 Upper Fixing Device 661 Connecting Member 662 Receiving Portion 67 Second engaging part 68 Base part p1 Connection pin p2 Connection pin (connecting member connectable to other pendant ropes)

Claims

1. A fixing device for a pendant rope that enables the pendant rope to be fixed to a boom, comprising: a first engaging portion that engages with a first end of the pendant rope; the first engaging portion is displaceable in the longitudinal direction of the boom; a receiving portion that abuts a portion closer to the center of the pendant rope than the first end in a state where the first end is engaged with the first engaging portion; A fixing device for a pendant rope.

2. a second engaging portion that engages with a second end located on the side opposite to the first end of the pendant rope; the first end and the second end are connectable to another pendant rope by a connecting member; one of the first engaging portion and the second engaging portion is capable of engaging the end of the pendant rope by the connecting member; The fixing device for a pendant rope according to Claim 1.

3. The first engaging portion is displaceable in the longitudinal direction in a state where the first engaging portion is engaged with the first end; The fixing device for a pendant rope according to Claim 1.

4. a second engaging portion that engages with a second end located on the side opposite to the first end of the pendant rope; the first engaging portion and the second engaging portion are displaceable in the thickness direction of the boom; The fixing device for a pendant rope according to Claim 1.

5. The second engaging portion has a regulating portion that regulates displacement upward from a position higher than the upper side in the thickness direction of the boom; The fixing device for a pendant rope according to Claim 4.

6. The second engaging portion is capable of engaging with the second end in a state where the second engaging portion is regulated to a position higher than the upper side in the thickness direction of the boom by the regulating portion; The fixing device for a pendant rope according to Claim 5.

7. The first engaging portion has a fixing portion that is located above the middle in the thickness direction of the boom and lower than the upper side in the thickness direction of the boom in a state where the first engaging portion is not engaged with the first end and the longitudinal direction of the boom is horizontal, and can be fixed; The fixing device for a pendant rope according to Claim 1.

8. having a base portion that enables the first engaging portion to rotate around a swing center; the first engaging portion is displaceable in the longitudinal direction and the thickness direction of the boom by swinging around the swing center; The fixing device for a pendant rope according to Claim 7, wherein the fixing portion is provided at a position deviated from a line connecting the swing center and a pin hole of the first engaging portion.

9. The receiving part is fastened to the boom, and the first engaging part is attached to the boom via the receiving part. The pendant rope fixing device according to claim 1.

10. A crane comprising the pendant rope fixing device according to any one of claims 1 to 9.

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