Mooring structure for construction machinery cab

Abstract

To provide a mooring structure of a cab for construction machine, capable of ensuring workability of mooring work.SOLUTION: A mooring hole 32 for mooring a cab 5 is provided on a vehicle body 2 side below the cab 5, as well as, a mooring body 30 to be mounted on a vehicle body 2 is provided so as to vertically penetrate through the mooring hole 32. The mooring body 30 includes: a main body part 30a extending along the vertical direction; and a flange part 30f extending outward along the direction orthogonal to the axial direction above the mooring hole 32 in a state of mooring to the vehicle body 2. An anti-falling-out part 30b for preventing the mooring body 30 from falling out from the mooring hole 32 is provided. The main body part 30a is constituted to be mounted on the vehicle body 2 side below the mooring hole 32 after the main body part is caused to pass through the mooring hole 32 downward from above. .SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a structure for fixing a cab to a vehicle body in a construction machine such as a shovel. [Background technology]

[0002] Figure 10 shows an excavator as an example of construction machinery. The excavator 1 has a body 2 that is rotatably mounted on crawlers 3, which serve as a traveling device, via a swivel 4, and a cab 5 is installed on top of the body 2. A boom 6 is attached to the front of the body 2 so that it can be raised and lowered.

[0003] In such a construction machine 1, a structure such as that shown in FIG. 11 is provided to tether the cab 5 to the vehicle body 2. In the example shown here, a mooring shaft 10 protrudes vertically upward from the vehicle body 2, while a mooring flange 11 is provided on the lower part of the cab 5 so as to form a horizontal surface. A mooring hole 12 is provided for passing the mooring shaft 10 through the mooring hole 12. The cab 5 is moored to the vehicle body 2 by passing the mooring shaft 10 through the mooring hole 12. The mooring shaft 10 has a hollow cylindrical shape, and a hole (not shown) provided along the central axis has a threaded inner surface. After passing the mooring shaft 10 through the mooring hole 12, a washer 7 is placed on the top surface of the mooring shaft 10, and a bolt 8 is tightened into the hole (not shown) of the mooring shaft 10. The washer 7 prevents the mooring shaft 10 from coming out of the mooring hole 12, and the cab 5 is moored to the vehicle body 2.

[0004] 12 shows another example of a mooring structure for a cab 5 in a construction machine 1. In the example shown here, a mooring shaft 20 protrudes horizontally from the vehicle body 2 toward the front of the vehicle, while a mooring flange 21 is provided on the lower part of the cab 5 so as to form a surface along a direction perpendicular to the fore-and-aft direction of the vehicle, and a mooring hole 22 is provided in the mooring flange 21. The mooring shaft 20 passes through the mooring hole 22 in the fore-and-aft direction, thereby mooring the cab 5 to the vehicle body 2. A hole (not shown) provided along the central axis of the cylindrical mooring shaft 20 has a threaded inner surface. After the mooring shaft 20 is passed through the mooring hole 22, a washer 7 is placed on the tip end surface of the mooring shaft 20 and a bolt 8 is tightened into the hole. This prevents the mooring shaft 20 from coming out of the mooring hole 22 by the washer 7, and the cab 5 is moored to the vehicle body 2.

[0005] Incidentally, prior art documents disclosing techniques relating to this type of cab mooring structure for construction machinery include, for example, Patent Documents 1 to 3 listed below. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-196712 [Patent Document 2] Japanese Patent Application Laid-Open No. 2005-344394 [Patent Document 3] Japanese Patent Application Laid-Open No. 2013-241751 Summary of the Invention [Problem to be solved by the invention]

[0007] 11 and 12, there is a drawback to the mooring work of the cab 5, in that the workability of either placing the cab on the vehicle body or attaching the washer to the mooring shaft is poor. In the example shown in FIG. 11, when placing the cab 5 on the vehicle body 2, it is necessary to lower the cab 5, which is suspended above the vehicle body 2, onto the vehicle body 2 while aligning the mooring holes 12 on the cab 5 with the mooring shafts 10 on the vehicle body 2. If the mooring holes 12 and the mooring shafts 10 are not aligned when the cab 5 is lowered, it is necessary to lift the cab 5 again and lower the cab 5 onto the vehicle body 2 while aligning the mooring holes 12 and the mooring shafts 10 again. On the other hand, in the example shown in FIG. 12 , when placing the cab 5 on the vehicle body 2, the cab 5 is first lowered onto the vehicle body 2 while roughly aligning it, and then the position of the cab 5 is adjusted and the mooring shaft 20 is passed through the mooring hole 22, so the work required for placing the cab 5 is relatively small. However, in this example, when attaching the washer 7 to the mooring shaft 20 that protrudes forward from the vehicle body 2 toward the cab 5 with the bolt 8, the mooring shaft 20 located below the cab 5 must be accessed from below the vehicle body 2, which is a cumbersome task (in the example shown in FIG. 11 , the mooring shaft 10 protrudes upward from the vehicle body 2, making it easy to access and install the washer 7). As such, with the conventional cab mooring structure, it is difficult to achieve both ease of cab placement and ease of washer installation during the mooring work, and there is a problem in ensuring ease of work throughout the mooring work.

[0008] SUMMARY OF THE INVENTION In view of the above circumstances, the present invention aims to provide a structure for mooring a cab of a construction machine that can ensure workability when mooring the cab to the vehicle body. [Means for solving the problem]

[0009] The present invention relates to a mooring structure for a cab of a construction machine, characterized in that the lower part of the cab is provided with a tethering hole for tethering the cab to the vehicle body, and a tethering body is attached to the vehicle body so as to pass vertically through the tethering hole, the tethering body having a main body portion extending in the vertical direction and a flange portion that extends outward in a direction perpendicular to the axial direction at a position above the tethering hole when tethered to the vehicle body, and a stop portion that prevents the tethering body from slipping out of the tethering hole, and the main body portion is configured to be passed through the tethering hole from above to below and then attached to the vehicle body below the tethering hole.

[0010] The tethering structure for the cab of a construction machine of the present invention can be configured to provide a hook portion on the tethering body and an engagement portion on the vehicle body side, and to resist the force acting from the cab to the tip side of the tethering body by engaging the hook portion with the engagement portion.

[0011] The tethering structure of the cab of the construction machinery of the present invention can be configured so that the tethering body is attached to the vehicle body side by inserting fasteners into the main body portion and the vehicle body side in a direction perpendicular to the insertion direction of the tethering body into the tethering hole. [Effects of the Invention]

[0012] The construction machine cab mooring structure of the present invention can provide the excellent effect of ensuring workability when mooring the cab to the vehicle body. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a perspective view showing a first embodiment of a mooring structure for a cab of a construction machine according to the present invention; [Figure 2] FIG. 2 is a perspective view showing the shape of a tether in the first embodiment. [Figure 3] FIG. 2 is an exploded perspective view of the vicinity of the cab mooring structure in the first embodiment. [Figure 4]1 is a side cross-sectional view showing a state in which the cab is placed on the vehicle body during the work of mooring the cab to the vehicle body. [Figure 5] 10 is a side cross-sectional view showing a process of passing a tether through a tether hole on the cab side from a state in which the cab is placed on the vehicle body. FIG. [Figure 6] FIG. 6 is a side cross-sectional view showing a state in which the tether body is attached to the vehicle body side, following the state shown in FIG. 5. [Figure 7] FIG. 4 is a side cross-sectional view showing a second embodiment of the present invention. [Figure 8] FIG. 10 is a side cross-sectional view showing a third embodiment of the present invention. [Figure 9] FIG. 10 is a side cross-sectional view showing a fourth embodiment of the present invention. [Figure 10] FIG. 1 is a side view showing a simplified example of a configuration of a shovel as a construction machine. [Figure 11] FIG. 1 is a perspective view showing an example of a conventional cab mooring structure for a construction machine. [Figure 12] FIG. 10 is a perspective view showing another example of a conventional cab mooring structure for a construction machine. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0015] 1 to 3 show an example (first embodiment) of a mooring structure for a cab of a construction machine according to the present invention. In this first embodiment, reference will also be made to the construction machine (shovel) shown in FIG. 10 and the reference numerals of the various parts.

[0016] As shown in Fig. 1, the mooring structure of the first embodiment includes a mooring body 30 that is attached to the vehicle body 2 and is configured to be able to moor the cab 5. Functionally, this mooring body 30 is a component that is the same as the mooring shafts 10, 20 shown in Figs. 11 and 12, but unlike the mooring shafts 10, 20 that are provided integrally with the frame that constitutes the vehicle body 2, the mooring body 30 is detachable from the vehicle body 2. Furthermore, the mooring body 30 includes a retaining portion 30b that functionally corresponds to the washer 7.

[0017] The configuration of this tether 30 alone is shown in Figure 2. Tether 30 is configured with a plate-like main body 30a that extends vertically and has a retaining portion 30b attached to the top. (Note that, in this specification, unless otherwise specified, directions such as front-to-back, left-to-right, and up-to-down are described with respect to vehicle body 2 as the reference, and as the orientation of tether 30 relative to vehicle body 2 when in use. Furthermore, in this specification, expressions such as "along the horizontal direction" or "along the vertical direction" appear in relation to the orientation of a component, but in such cases, this does not necessarily mean that the component is exactly aligned with the horizontal or vertical direction. It merely means that the angle is close to the horizontal or vertical direction to the extent that it does not interfere with the functionality required of the component, or that the orientation of the component in three-dimensional space includes a component of that orientation.) The plate-shaped main body 30a extends vertically along a surface perpendicular to the longitudinal direction of the vehicle body 2, and two mounting holes 30c are provided at the vertical middle of the main body 30a, one above the other, penetrating the main body 30a from front to back, for mounting to the vehicle body 2. A hook 30d that engages with the vehicle body 2 is provided at the lower end of the main body 30a.

[0018] Hook portion 30d is a plate-shaped member attached to the lower end of main body portion 30a so as to be perpendicular to the plane of main body portion 30a, and protrudes forward, downward, and rearward from the lower end of main body portion 30a. The forward-protruding portion is adapted to engage with an engaging portion 37 provided on the vehicle body 2, as will be described later. In addition, the front lower corner of hook portion 30d is notched at an angle, so that during the mooring operation, which will be described later, the front lower corner of hook portion 30d does not interfere with the vehicle body 2, and hook portion 30d can smoothly engage with the vehicle body 2.

[0019] The retaining portion 30b includes a cylindrical shaft portion 30e extending in the vertical direction and a disk-shaped flange portion 30f that extends outward in a direction perpendicular to the axial direction from a vertical middle portion of the shaft portion 30e. The diameter of the flange portion 30f is set larger than the diameter of the tether hole 32 provided in the tethering flange 31 on the cab 5 side, so that the flange portion 30f does not pass through the tether hole 32 when the tethering body 30 is inserted through the tether hole 32. When the cab 5 is tethered to the vehicle body 2 by the tethering body 30, the tethering body 30 passes through the tether hole 32 with the shaft portion 30e located within the tether hole 32, and in this state, the flange portion 30f is positioned above the tether hole 32, thereby preventing the tethering body 30 from slipping out of the tether hole 32.

[0020] As shown in Fig. 3, a mooring flange 31 and a mooring hole 32 are provided at the lower rear of the cab 5 as a structure for passing a mooring body 30 and mooring the cab 5 to the vehicle body 2. The mooring flange 31 is a plate-like member that protrudes rearward from the lower rear of the cab 5, forming a horizontal surface, and has a circular mooring hole 32 provided in the center, penetrating vertically through the mooring flange 31. As shown in Fig. 1, when the cab 5 is in a moored state, the mooring body 30 is attached to the vehicle body 2 so as to pass vertically through the mooring hole 32.

[0021] The diameter of tether hole 32 is set to be smaller than the diameter of flange 30f of tether 30 and larger than the maximum dimension of main body 30a and hook 30d in a plan view. In other words, the dimensions are such that during the tethering operation described below, hook 30d and main body 30a can pass through tether hole 32, but flange 30f cannot pass through tether hole 32, thereby preventing tether 30 from slipping out of tether hole 32.

[0022] As shown in FIG. 3, the vehicle body 2 is provided with a mounting portion 33 in an area below the tether flange 31 and the tether hole 32 when the cab 5 is tethered (see FIG. 1). In the first embodiment, the mounting portion 33 is provided on the upper surface of the frame 34 constituting the vehicle body 2 and is a plate-like member extending laterally and forming a plane perpendicular to the front-rear direction. A base portion 35 for mounting the tethering body 30 is provided in the mounting portion 33 at a position directly below the tethering hole 32 in the left-right direction. The base portion 35 is an octagonal area that protrudes slightly rearward from the plane of the mounting portion 33 and faces the main body portion 30a of the tethering body 30 when the cab 5 is tethered as shown in FIG. 1. Two mounting holes 36 are provided, one above the other, in the center of the base portion 35, at positions corresponding to the positions of the mounting holes 30c provided in the main body portion 30a of the tethering body 30. When the cab 5 is in a tethered state, the position of the mounting hole 30c of the tether 30 is aligned with the position of the mounting hole 36 on the vehicle body 2, and a bolt 40 serving as a fastener is fastened so as to pass through both holes, thereby fixing the tether 30 to the vehicle body 2. The bolt 40 is inserted into the mounting holes 30c, 36 in a direction perpendicular to the axial direction of the tether 30 (i.e., the direction in which the tether 30 is inserted into the tether hole 32).

[0023] The lower end of the base portion 35 protrudes rearward from the surface defined by the mounting portion 33, and this portion constitutes an engagement portion 37 with the tether 30. In other words, when the cab 5 is in the tethered state, the front portion of the hook portion 30d of the tether 30 is positioned below the lower end (engagement portion 37) of the tether 35 and protrudes forward from the end surface defined by the tether 35, thereby engaging the hook portion 30d with the engagement portion 37 and preventing the tether 30 from moving away from the tether 35. The arrangement and function of the hook portion 30d and the engagement portion 37 will be described in detail later.

[0024] Next, a procedure for mooring the cab 5 to the vehicle body 2 using the cab mooring structure for a construction machine of the first embodiment will be described.

[0025] 4, the cab 5 is placed on the vehicle body 2. Then, the position of the cab 5 relative to the vehicle body 2 is adjusted so that the anchoring hole 32 of the anchoring flange 31 is positioned above the base portion 35.

[0026] In this state, the tether 30 is passed downward through the tethering hole 32 with the hook portion 30d facing downward. At this time, as shown in FIG. 5, the tether 30 is inserted at an angle with the bottom end facing slightly rearward so that the hook portion 30d wraps around the base portion 35. After the tether 30 is inserted all the way to the bottom, the tether 30 is stood approximately vertically, with the main body portion 30a facing the end face of the base portion 35, and the hook portion 30d is engaged with the engagement portion 37 at the bottom end of the base portion 35. At this time, because the front lower portion of the hook portion 30d is cut out, this portion does not interfere with the frame 34 that constitutes the vehicle body 2, and the hook portion 30d can be smoothly engaged with the engagement portion 37.

[0027] As shown in Figure 6, bolts 40 are fastened into mounting holes 30c, 36 provided in the main body 30a of the tether 30 and the base 35 on the vehicle body 2 side, and the tether 30 is fixed to the mounting portion 33 of the vehicle body 2. In this way, the cab 5 is tethered to the vehicle body 2 as shown in Figures 1 and 10. In this series of tethering operations, when the cab 5 is lowered onto the vehicle body 2, it is not necessary to pass the tethering shaft protruding vertically through the tethering hole on the cab 5 side, so positioning work can be performed easily. Furthermore, when the tethering body 30 is subsequently attached to the vehicle body 2, work can be performed on the tethering body 30 protruding upward from the vehicle body 2, so there is no need to access the tethering shaft extending horizontally from below the vehicle body 2, and both operations can be performed easily.

[0028] In the conventional example shown in Figures 11 and 12, the insertion direction of the mooring shafts 10, 20 on the vehicle body 2 into the mooring holes 12, 22 on the cab 5 is the same as the insertion direction when fixing the washer 7 to the mooring shafts 10, 20 with the bolt 8, and the structure was such that the bolt 8 was inserted into the tip of the mooring shafts 10, 20 to fix the washer 7. For this reason, if the mooring shaft 10 was oriented upward as in Figure 11 to make it easier to insert the bolt 8, it was difficult to align the cab 5 with the vehicle body 2, while if the mooring shaft 20 was oriented forward as in Figure 12 to make it easier to align the cab 5, it was difficult to access the tip of the mooring shaft 20 when attaching the washer 7.

[0029] In this first embodiment, first, the mooring body 30 itself, which corresponds to the mooring shaft, is detachable at its lower end relative to the vehicle body 2, that is, at a position below the mooring hole 32 when moored, and the retaining portion, which corresponds to a washer provided at its upper end, does not need to be detached during mooring work. As a result, the insertion direction of the mooring body 30 into the mooring hole 32 of the cab 5 is vertical, and the fastening work using the fasteners (bolts) 40 can be performed below the mooring flange 31 on the cab 5 side (on the vehicle body 2 side) after the cab 5 has been placed on the vehicle body 2. This makes it easy to align the cab 5 with the vehicle body 2 and to attach the mooring body 30 to the vehicle body 2 by fastening the bolts 40, as described above, and significantly reduces the effort required for mooring the cab 5.

[0030] Here, as shown in FIG. 7 as a second embodiment, the tether 30 can be attached to and detached from the vehicle body 2 at its lower end (below the tethering hole 32), but the insertion direction (axial direction) of the tether 30 into the cab 5 can also be configured to coincide with the insertion direction of the tether 30 into the vehicle body 2. That is, for example, instead of attaching a washer to the tether 30 with a bolt, the tether 30 itself can be screwed into the vehicle body 2 at its base end, thereby tethering the cab 5. In this case, too, in the process of tethering the cab 5, it is easy to align the cab 5 with the vehicle body 2 and to attach the tether 30 to the vehicle body 2 by fastening the bolt 40, as in the first embodiment (see FIGS. 1 to 5). However, with this structure, it becomes somewhat difficult to ensure durability against shear forces acting on the tether 30.

[0031] When the construction machine 1 is in operation, vibrations are frequently generated due to various types of work, and forces are applied to the parts that tether the cab 5 (the tethering shafts 10, 20 in the conventional example, and the tethering body 30 in the first and second embodiments) as the cab 5 tries to move relative to the vehicle body 2. When the cab 5 is tethered by the tethering shaft 10 or tethering body 30 that extend vertically, as in the conventional example of FIG. 11 and the first and second embodiments of FIGS. 1 and 7, this force is applied in a shear direction (a direction perpendicular to the axial direction) to the tip end portions of the tethering shaft 10 or tethering body 30. In a structure in which the base end is joined to the vehicle body 2, as in the tethering body 30 of the first and second embodiments, a large force is generated at the joint.

[0032] In a mooring structure such as the first embodiment shown in FIGS. 1 to 3, a hook portion 30d is provided at the lower end of the mooring body 30, and an engagement portion 37 is provided on the vehicle body 2. Engagement of the hook portion 30d and the engagement portion 37 makes it difficult for the mooring body 30 to come off the vehicle body 2 against the shear force. In a structure in which the cab 5 is moored by the vertically extending mooring body 30 as shown in FIGS. 1 and 6, a force that tends to move the cab 5 rearward (leftward in FIG. 6) relative to the vehicle body 2 acts on the tip of the mooring body 30, loosening the connection between the mooring body 30 and the vehicle body 2 or disengaging the mooring body 30 from the vehicle body 2. When such a force occurs, in the first embodiment shown in FIGS. 1 and 6, the engagement of the hook portion 30d with the engagement portion 37 prevents the mooring body 30 from rotating vertically relative to the vehicle body 2, making it difficult for the bolt 40 to become loose due to the force applied from the cab 5.

[0033] The provision of such hook portion 30d is made possible by setting the insertion direction of the bolt 40 for attaching the tether 30 to the vehicle body 2 to a direction perpendicular to the insertion direction (vertical direction) of the tether 30 into the tether hole 32 on the cab 5. When the insertion direction of the tether 30 for tethering the cab 5 and the direction for attaching the tether 30 to the vehicle body 2 are the same, as in the tether 30 of the second embodiment, it is not possible to provide a hook portion at the tip of the main body as in the first embodiment, because the hook portion would interfere with the insertion of the tether 30 into the vehicle body 2 (however, it is possible to attach a structure such as the protrusion 30d in the third embodiment described below after the tether 30 has been attached to the vehicle body 2).

[0034] The setting of the engagement direction of the hook portion will be further explained. When the lower rear portion of the cab 5 is tethered by a tether 30 extending upward from the vehicle body 2 as in the first embodiment shown in FIGS. 1 and 6, a particular problem for the joint between the tether 30 and the vehicle body 2 is the force applied when the cab 5 attempts to move rearward. This force acts rearward on the tip end of the tether 30. For the tether 30, this force acts in a direction that rotates the tether 30 backward (counterclockwise as viewed from the right side) around the base end, which is the joint with the vehicle body 2. To maintain the joint between the tether 30 and the vehicle body 2 against this force, the tether 30 and the vehicle body 2 must be engaged in a positional relationship in which the component on the vehicle body 2 is located forward of the component on the tether 30, and in the first embodiment shown in FIG. 6, the hook portion 30d and the engagement portion 37 of the base portion 35 are provided as components that match this force. Another possible structure that satisfies this condition is, for example, as shown in Fig. 8 as a third embodiment, a hook portion 30d is provided as a hook portion that protrudes downward in front of the main body 30a at the top of the tether 30 (forward with respect to the vehicle), and a recess 37 is provided on the vehicle body 2 at the top of the mounting portion 33 as an engagement portion into which the protrusion 30d can be inserted, so that the protrusion 30d is inserted into the recess 37 when the tether 30 is passed through the tethering hole 32 on the cab 5. Alternatively, as shown in Fig. 9 as a fourth embodiment, a hook portion 30d that protrudes forward may be provided in the vertical middle of the main body 30a, and a recess 37 as an engagement portion into which the hook portion 30d can be inserted may be provided at a corresponding position on the vehicle body 2 (note that when the hook portion 30d is provided at a position away from the bottom end in this way, it is more effective to have the hook portion 30d protrude slightly diagonally upward toward the front as shown in Fig. 9 in order to prevent rotation). As such, various structures can be considered for the hook portion and engagement portion for engaging the tether 30 to the vehicle body 2, but among them, the first embodiment shown in Figures 1 and 6, in which the hook portion 30d is provided at the lower end of the tether 30, is particularly preferred because it can effectively suppress rotation with a simple and easy-to-manufacture component configuration.

[0035] As described above, each of the above embodiments has a tethering hole 32 at the bottom of the cab 5 for tethering the cab 5 to the vehicle body 2, and a tethering body 30 that is attached to the vehicle body 2 so as to pass vertically through the tethering hole 32, and the tethering body 30 has a main body portion 30a that extends in the vertical direction, and a flange portion 30f that extends outward in a direction perpendicular to the axial direction at a position above the tethering hole 32 when tethered to the vehicle body 2, and a stop portion 30b that prevents the tethering body 30 from slipping out of the tethering hole 32, and the main body portion 30a is configured to be passed through the tethering hole 32 from top to bottom and then attached to the vehicle body 2 below the tethering hole 32. In this way, the insertion direction of the anchoring body 30 into the anchoring hole 32 of the cab 5 is vertical, and the fastening work using the bolt 40 can be performed below the anchoring flange 31 on the cab 5 side (on the vehicle body 2 side).This makes it easy to align the cab 5 with the vehicle body 2 and to attach the anchoring body 30 to the vehicle body 2 by fastening the bolt 40, thereby reducing the effort required for anchoring the cab 5.

[0036] In some embodiments, the tether 30 is provided with a hook portion 30d and an engagement portion 37 on the vehicle body 2, and the engagement between the hook portion 30d and the engagement portion 37 is configured to resist a force acting from the cab 5 on the tip side of the tether 30. In this way, the tether 30 can withstand a force acting on the tether 30 in the shear direction, making it difficult for the tether 30 to come off the vehicle body 2.

[0037] In some embodiments, the tether 30 is attached to the vehicle body 2 by inserting a fastener (bolt) 40 into the main body 30a and the vehicle body 2 in a direction perpendicular to the insertion direction of the tether 30 into the tether hole 32. This facilitates the installation of the hook portion 30d for engaging the tether 30 with the vehicle body 2.

[0038] Therefore, according to each of the above-described embodiments, the workability in the work of mooring the cab to the vehicle body can be ensured.

[0039] The construction machine cab mooring structure of the present invention is not limited to the above-described embodiment. For example, the construction machine to which the present invention is applied is not limited to excavators, and the present invention can be applied to various vehicles as long as the construction machine has a cab mounted on the vehicle body. In addition, various modifications can be made to the present invention without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0040] 2. Body 5 Cab 30 Tethered Body 30a Main body 30b Retaining part 30d Hook part (protruding part) 30f Tsubabe 32 Mooring hole 37 Engagement portion (recess) 40 Fasteners (Bolts)

Claims

1. A mooring hole is provided at the bottom of the cab for mooring the cab to the vehicle body side, a tether attached to the vehicle body so as to pass through the tether hole in the vertical direction; The tether includes a main body extending in the vertical direction; a flange portion extending outward along a direction perpendicular to the axial direction at a position above the tether hole when the tether is attached to the vehicle body, and a retaining portion that prevents the tether from slipping out of the tether hole; The main body is configured to be passed through the tether hole from above to below, and then attached to the vehicle body below the tether hole, A hook portion is provided on the tether and an engagement portion is provided on the vehicle body side, The engagement between the hook portion and the engaging portion is configured to resist a force acting from the cab to the tip side of the tether. A mooring structure for a cab of a construction machine, characterized by:

2. The tether is configured to be attached to the vehicle body by inserting a fastener into the main body and the vehicle body in a direction perpendicular to the insertion direction of the tether into the tether hole.

2. The cab tethering structure for a construction machine according to claim 1,

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