JPH0630253U - Cab of work machine - Google Patents

Abstract

(57) [Summary] [Purpose] To effectively cushion the vibrations transmitted from the frame to the cab body to improve ride comfort and driving operability. A cab side bracket 32 having a pin connecting hole 32A formed on a floor plate 31A of a cab main body 31 is attached by welding downward, and a pin connecting hole 33A is formed on an upper surface portion 34A of a revolving frame 34. The pair of frame side brackets 33, 33 are attached by welding upward so as to sandwich the cab side bracket 32 from both left and right sides. A cylindrical vibration-proof bushing 35 made of rubber or the like is inserted into the pin connecting hole 32A of the cab 32 on the cab side, and the vibration-proof bushing 3 is formed.
The connecting pin 36 is inserted through the connector 5 to connect the cab bracket 32 and the frame brackets 33, 33.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cab of a working machine provided in a working machine such as a hydraulic excavator, and particularly to a cab of a working machine capable of preventing vibration from a frame from being transmitted to the cab.

[0002]

[Prior art]

 8 to 10 show a hydraulic excavator as an example of a conventional working machine with a cab.

In the figure, 1 is an undercarriage, 2 is a revolving device, 3 is an upper revolving structure which is mounted on the lower traveling body 1 via the revolving device 2 so as to be revolvable, and which constitutes a working machine body, The upper revolving structure 3 is composed of a revolving frame 4 as a frame having a frame structure, a machine room 5, an operator's cab 6 and a counterweight 7 provided on the revolving frame 4, and A mounting bracket 4A, which is located on the right side of the operator's cab 6 and is used for a working device 8 to be described later, is integrally provided in the front part. The turning frame 4 is composed of a center frame, a side frame, a connecting frame and the like.

Reference numeral 8 denotes a working device provided in a front portion of the upper swing body 3, and the working device 8 includes a boom 9 provided on a mounting bracket 4 A of the swing frame 4 so as to be able to move up and down, and the boom 9. Of the boom 10, the arm 10 and the bucket 11 are rotatably provided on the tip side of the arm 10, and the boom 11 includes a boom cylinder 12, It is operated by the arm cylinder 13 and the bucket cylinder 14.

Reference numeral 15 denotes a driver's cab main body which constitutes a main body of the driver's cab 6, and the driver's cab main body 15 is, as shown in FIG. 5, a floor plate 15A, a front surface portion 15B provided on the floor plate 15A, and a rear surface portion. 15C, the left and right side surface portions 15D (only one is shown), and the upper surface portion 15E are formed as a box-shaped cab box. Further, the driver's cab body 15 is provided with a floor plate bracket 15F for fixing the floor plate 15A to the lower ends of the front face portion 15B, the rear face portion 15C and the side face portions 15D, and the right side face portion 15D is provided with the driver's cab body 15. A door 16 through which an operator can get in and out is provided so as to be opened and closed. The operator cab body 15 is mounted on the upper surface portion 4B of the revolving frame 4 via buffer supports 17 described later.

.. are buffer supports provided between the floor plate 15A of the cab main body 15 and the revolving frame 4 in order to cushion the vibration from the revolving frame 4 from being transmitted to the cab main body 15. Each of the buffer supports 17 is provided at four corners of the floor plate 15A at front, rear, left, and right intervals, for example, four, and as shown in FIG. 10, a pair of stoppers 18, 18 and a space between the stoppers 18 are provided. Mounted on the upper surface 4B of the revolving frame 4 and sandwiching the upper surface 4B of the revolving frame 4, and a mounting penetrating the upper surface 4B of the revolving frame 4 through the center of each of the antivibration rubbers 19. It is composed of a cylindrical spacer 20 inserted into the hole 4C, and a bolt 22 inserted into the spacer 20 from the turning frame 4 side and having a nut 21 fastened on the floor plate bracket 15F. There is.

Here, in each of the buffer supports 17, the nuts 21 are strongly screwed to the bolts 22 to compress and deform the anti-vibration rubbers 19 between the respective stoppers 18, so that the anti-vibration rubbers 19 are initialized. The upper surface portion 4B of the revolving frame 4 is strongly clamped in a state where a load is applied. The buffer supports 17 support the entire driver's cab 6 on the swivel frame 4 via the anti-vibration rubbers 19, and particularly buffer the vertical vibration of the driver's cab body 15. Further, a gap S1 having a predetermined size is formed between the upper surface portion 4B of the revolving frame 4 and each stopper 18, and the vibration width (stroke) of the operator cab body 15 is restricted within the range of this gap S1.

[0008]

[Problems to be solved by the device]

 By the way, in the above-mentioned conventional technology, each buffer support 17 is provided with stoppers 18 and 18, and each stopper 18 regulates the vibration width (stroke) of the cab body 15 within the range of the gap S1.

Therefore, when excessive vibration is transmitted to the swivel frame 4, the stoppers 18 collide with the upper surface portion 4B of the swivel frame 4, and the swivel frame 4 and the floor plate 15A of the operator cab body 15 are separated from each other. There is a problem that a big shock occurs between them.

In addition, each buffer support 17 sandwiches the upper surface portion 4 B of the revolving frame 4 from above and below with separate anti-vibration rubbers 19, 19 and connects each anti-vibration rubber 19 with a spacer 20 and a bolt 22. Therefore, when the revolving frame 4 and the cab body 15 vibrate in the lateral direction, the spacer 20 or the like may collide with the inside of the mounting hole 4C of the revolving frame 4 and cause a large shock. However, there is a problem that each anti-vibration rubber 19 cannot effectively absorb the vibration.

The present invention has been made in view of the above-mentioned problems of the prior art. The present invention can effectively dampen vibrations transmitted from the frame to the cab body, and improve ride comfort and driving operability. The purpose is to provide a working machine cab that can be operated.

[0012]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, in the present invention, a working machine cab is provided with a frame of the working machine, a box-shaped cab body disposed on the frame, and a frame side from the cab body. And a frame in which a pin connecting hole is formed, and a frame in which a pin connecting hole is formed A side bracket, and a vibration-proof bush formed in a tubular shape from a vibration-proof elastic material and inserted into at least one of the frame-side bracket pin connection hole and the cab-side bracket pin connection hole. , A connecting pin that is inserted into the vibration-proof bush and connects the frame-side bracket and the cab-side bracket.

Here, it is desirable to provide a plate-shaped vibration-proof plate between the frame-side bracket and the cab-side bracket, which is made of a vibration-proof elastic material.

[0014]

[Action]

 With the above configuration, the vertical vibration from the frame is transmitted to the driver's cab main body through the vibration damping bush, so that at this time, the vibration damping bush is elastically deformed in the radial direction and the vertical vibration can be damped. Further, the vibrations in the front-rear direction and the left-right direction from the frame are also transmitted to the operator's cab body through the vibration-proof bushing, and at this time, the vibration-proof bushing is elastically deformed and the vibrations in the front-rear direction and the left-right direction can be damped.

Further, by providing a vibration-proof plate between the frame-side bracket and the cab-side bracket, the vibration-proof plate is elastically deformed to damp vibrations and prevent the brackets from colliding due to vibrations. It is possible to prevent large vibrations from being transmitted to the cab body.

[0016]

【Example】

 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In the embodiment, the same components as those of the above-described conventional technique are designated by the same reference numerals, and the description thereof will be omitted.

1 and 2 show a first embodiment of the present invention.

In the figure, 31 indicates a driver's cab body according to the present embodiment which constitutes the driver's cab 6, and the driver's cab body 31 is substantially the same as the driver's cab body 15 described in the prior art. Although it is formed as a box-shaped cab box from the rear surface portion 31C, the side surface portion 31D (only one is shown), and the upper surface portion 31E, the operator's cab main body 31 extends from the floor plate 31A toward the later-described swivel frame 34 side. Four cab-side brackets 32, 32, ...

Here, each cab-side bracket 32 is made of a thick metal plate as shown in FIG. 2, and each cab-side bracket 32 is spaced apart in the four corners of the floor plate 31A in the front-rear and left-right directions. It is attached by welding to the lower surface. A pin connecting hole 32A is formed in each cab 32 on the cab side in the thickness direction.

Reference numerals 33 and 33 denote a pair of frame side brackets formed of a thick metal plate and projecting from the upper surface portion 34A of the revolving frame 34. The frame side brackets 33 are provided on the respective cab sides. The bracket 32 is provided on the upper surface portion 34A of the revolving frame 34 so as to be laterally spaced by means of welding or the like so as to sandwich the bracket 32 from both the left and right sides. Further, a total of four sets of the frame side brackets 33 are arranged on the revolving frame 34 corresponding to the respective cab side brackets 32, and pin connecting holes 33A, 33A, ... Are drilled in the thickness direction thereof. Has been done.

Reference numeral 35 denotes an anti-vibration bush (only one is shown) inserted and fixed in each pin connecting hole 32 A of each cab bracket 32. The anti-vibration bush 35 is made of rubber or the like. It is formed into a short tubular shape with a connecting pin insertion hole 35A at the center of the shaft, and the vibration-proof bushing 35 has a length corresponding to the thickness of the cab bracket 32. There is.

Reference numerals 36, 36, ... Show the connecting pins inserted into the connecting pin insertion holes 35A of the respective vibration-proof bushes 35. The connecting pins 36 are provided on the shaft portion 36A and on the base end side of the shaft portion 36A. It is composed of a disk-shaped head portion 36B formed. Here, the head portion 36B is formed to have a larger diameter than the pin connecting hole 33A of the frame side bracket 33, and abuts against the surface of one frame side bracket 33 so as to be prevented from coming off. In addition, a retaining pin insertion hole 36C is bored in the radial direction of the shaft portion 36A on the tip side of the shaft portion 36A. Then, the connecting pins 36 are inserted into the pin connecting holes 33A of the frame-side brackets 33 and the connecting pin insertion holes 35A of the anti-vibration bushes 35 to connect the cab-side brackets 32 and the frame-side brackets 33, respectively. The retaining pin 37 is inserted into the retaining pin insertion hole 36C of each coupling pin 36 to prevent the retaining pin 37 from retaining.

The operator's cab of the working machine according to the present embodiment has the above-mentioned configuration, and its basic operation is not significantly different from that of the prior art.

However, in the present embodiment, the floor plates 31A of the cab main body 31 are provided with the pin connection holes 32A so as to face the left and right ends of the floor plate 31A. 32 are attached to each other in the front-rear direction and the left-right direction by welding, and each frame-side bracket 33 having pin connection holes 33A formed in the upper surface portion 34A of the swivel frame 34 is paired in two to form each cab-side bracket 32 on the left-right side. A total of four sets are attached by welding so that they are sandwiched from both sides. A tubular vibration-proof bushing 35 made of a vibration-proof material such as rubber is provided in the pin connection hole 32A of each cab bracket 32 on each cab, and each frame-side bracket Pins 33 are connected to the driver's cab side brackets 32 and frame side brackets 33 by inserting the connecting pins 36 into the pin connecting holes 33A of 33 and the connecting pin insertion holes 35A of the vibration-proof bushing 35. Therefore, the following effects are achieved.

That is, when vibrations of the hydraulic excavator during traveling or during work are transmitted to the cab body 31 via the revolving frame 34, the frame-side bracket 33 provided on the revolving frame 34 is moved in the vertical direction, the horizontal direction, and the horizontal direction. The vibration transmitted in the front-back direction is transmitted to each connecting pin 36. The vibrations transmitted to the connecting pins 36 are transmitted to the cab bracket 32 only through the vibration isolation bushes 35, so that the vibration isolation bushes 35 are elastically deformed in the radial direction at this time. The vibration isolation bushes 35 can absorb and damp vibrations in the vertical direction, the horizontal direction, and the front-back direction.

Therefore, according to the present embodiment, even if a large vibration is transmitted from the lower traveling body 1 or the working device 8 to the revolving frame 34, it is transmitted from each frame side bracket 33 to each cab side bracket 32. Vibrations can be effectively dampened, vibrations from almost any direction transmitted to the floor plate 31A of the cab main body 31 can be attenuated, and the riding comfort and driving operability of the vehicle can be improved.

Next, FIG. 3 shows a second embodiment of the present invention, which is characterized in that a vibration-proof bush is provided in the pin connecting hole of the frame side bracket. In the present embodiment, the same components as those of the above-described conventional technique are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 41 denotes a cab-side bracket provided on the floor plate 31 A of the cab main body 31, and the cab-side bracket 41 is substantially the same as the cab-side bracket 32 of the first embodiment described above. Although mounted on the four corners of the floor plate 31A by being welded to the lower surface of the floor plate 31A so as to be separated from each other in the front-rear direction and the left-right direction, each cab-side bracket 41 has a pin size that engages with the connecting pin 36. A connecting hole 41A is formed.

Reference numerals 42 and 42 denote a pair of frame-side brackets. The frame-side brackets 42 are provided on the upper surface portion 34 A of the revolving frame 34 so as to project in the same manner as the frame-side bracket 33. Although the bracket 41 is provided so as to be sandwiched from both the left and right sides, the pin connecting hole 42A of each frame side bracket 42 is formed to have a larger diameter than the pin connecting hole 33A.

Reference numeral 43 denotes an anti-vibration bush fixed by being inserted into each pin connection hole 42A of each frame-side bracket 42, and each anti-vibration bush 43 is the anti-vibration bush according to the first embodiment described above. Similar to the swing bush 43, the swing bush 43 is formed in a short tubular shape having a connecting pin insertion hole 43A at the center of the shaft and has a length dimension corresponding to the thickness dimension of the frame side bracket 42.

Then, the connecting pins 36 are inserted into the pin connecting holes 41A of the cab-side brackets 41 and the connecting pin insertion holes 43A of the anti-vibration bushes 43, and the cab-side brackets 41 and the frames are inserted. The cab main body 31 is supported on the revolving frame 34 by connecting with the side bracket 42.

Thus, in this embodiment having such a configuration, it is possible to obtain substantially the same operational effects as those of the first embodiment.

Next, FIG. 4 shows a third embodiment of the present invention. The feature of this embodiment is that a plate-like member is formed between the frame side bracket and the cab side bracket by an elastic material for vibration isolation. This is due to the installation of the anti-vibration plate. In this embodiment, the same components as those in the first embodiment described above are designated by the same reference numerals and the description thereof will be omitted.

In the figure, reference numerals 51 and 51 denote disk-shaped vibration-proof plates formed of a vibration-proof elastic material such as rubber, and a connecting pin 36 is inserted in the center of each of the vibration-proof plates 51. A connecting pin insertion hole 51A is formed. As shown in FIG. 4, the vibration-proof plates 51 are arranged on both axial ends of the vibration-proof bush 35, and are located on both sides of the cab-side bracket 32. It is designed to be sandwiched between the side bracket 33 and the side bracket 33.

The present embodiment has the above-described configuration, and although the present embodiment has substantially the same operational effect as the above-mentioned embodiments, in particular, according to the present embodiment, the revolving frame 34 is moved in the left-right direction. The vibration transmitted to the vibration frame 34 is transmitted from the frame-side brackets 33 provided on the swivel frame 34 in the left-right direction of the cab-side bracket 32 in the thickness direction of the vibration-proof plates 51 to elastically deform the vibration-proof plates 51. Therefore, at this time, the vibration isolation plates 51 can absorb and damp vibrations in the left-right direction.

Next, FIG. 5 shows a fourth embodiment of the present invention, which is characterized in that a vibration-proof bush is provided in the pin connecting hole of the frame side bracket and the frame side bracket and the operation chamber side are provided. This is because a plate-shaped vibration-proof plate made of an elastic material for vibration-proofing was provided between the bracket and the bracket. In this embodiment, the same components as those in the second embodiment described above are designated by the same reference numerals and the description thereof will be omitted.

In the figure, reference numerals 61 and 61 denote anti-vibration plates. Each of the anti-vibration plates 61 is substantially the same as the anti-vibration plate 51 described in the third embodiment, and an elastic material for anti-vibration such as rubber. Is formed into a disc shape, and a connecting pin insertion hole 61A is formed at the center of each vibration isolation plate 61. Then, as shown in FIG. 5, the anti-vibration plates 61 are arranged on both left and right sides of the driver's cab-side bracket 41, and are sandwiched between the operator's cab-side bracket 41 and the frame-side brackets 42. It is like this.

Also according to the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as the third embodiment.

Next, FIG. 6 shows a fifth embodiment. The feature of this embodiment is that a pin connecting hole is formed in the floor plate of the operator's cab body so as to face both left and right ends of the floor plate. The cabs on the cab side are attached to each other by welding so that the brackets on the cab side are separated from each other in the front-rear and left-right directions, and two brackets on the frame side with pin connection holes are formed on the upper surface of the revolving frame. A total of 4 pairs of rackets are welded and mounted so that they are sandwiched from the left and right sides, and a length dimension equal to the width dimension between one pair of frame side brackets is placed in the pin connection hole of each cab side bracket and each frame side bracket. This is because a vibration damping bush formed in a cylindrical shape having a connecting pin insertion hole at the center of the shaft is inserted and fixed. In this embodiment, the same components as those in the first embodiment described above are designated by the same reference numerals and the description thereof will be omitted.

In the figure, reference numerals 71 and 71 denote a pair of frame side brackets, and each frame side bracket 71 is substantially the same as the frame side bracket 42 described in the second embodiment. It is projectingly provided on the upper surface portion 34A, and is provided so as to sandwich each of the driver's cab-side brackets 32 from both the left and right sides with a space therebetween. Each of the frame-side brackets 71 has a pin connecting hole of the operator-cabin bracket 32. A pin connection hole 71A having the same diameter as 32A is formed.

Reference numeral 72 denotes an anti-vibration bush (only one is shown) that is fixed by being inserted into each pin connecting hole 32A, 71A of each cab bracket 32 and each frame bracket 71. The bush 72 is formed of a vibration-proof elastic material such as rubber into a tubular shape having a connecting pin insertion hole 72A at the center of the shaft, and has a length dimension equal to the width dimension between the pair of frame side brackets 71, 71. Have

Reference numerals 73 and 73 denote vibration-proof plates formed in a disk shape from a vibration-proof elastic material such as rubber, and each of the vibration-proof plates 73 has a vibration-proof bush 72 inserted at its center. An insertion hole 73A is formed. Then, as shown in FIG. 6, the respective vibration-proof plates 73 are inserted into the outer peripheral side of the vibration-proof bush 72, are positioned on both sides of the cab bracket 32, and are arranged between the frame-side brackets 71. It is like this.

Although the present embodiment configured as described above has substantially the same effects as the above-described embodiments, particularly in the present embodiment, the pins of both the cab-side bracket 32 and the frame-side bracket 71 are provided. Since the vibration-proof bushing 72 is inserted into the connecting holes 32A and 71A and the vibration-proof plate 73 is arranged between the operation chamber side bracket 32 and the frame side bracket 71, the vibration-proofing part turning frame 34 is provided. The vibration transmitted from the side to the cab main body 31 side can be effectively damped by the vibration damping bush 72 and each vibration damping plate 73.

Next, FIG. 7 shows a sixth embodiment of the present invention. The feature of this embodiment is that a pin connecting hole is formed so as to face the upper surface of the revolving frame on the left and right ends of the upper surface. The brackets on the frame side, which are formed on the front and rear sides, are separated from each other on the left and right by welding, and the brackets for the cab on the cab body are provided with pin connection holes. There were a total of four welded brackets attached so that the brackets were sandwiched from the left and right sides. In this embodiment, the same components as those in the fifth embodiment described above are designated by the same reference numerals and the description thereof will be omitted.

In the figure, reference numeral 81 denotes a frame side bracket, and the frame side bracket 81 is made of a thick metal plate, and each of the driver's cab side brackets 81 is located at the four corners of the floor plate 31A from the upper surface 34A of the revolving frame 34. The frame-side brackets 81 are provided with pin connecting holes 81A in the thickness direction so as to project toward the corresponding positions.

Reference numerals 82 and 82 denote a pair of cab-side brackets formed of a thick metal plate and projecting downward from the four corners of the floor plate 31 A of the cab 31. The frame-side bracket 81 is provided on the lower surface of the floor plate 31A so as to be sandwiched from both the left and right sides with a space therebetween in the left-right direction by means such as welding. A total of four sets of the cab-side brackets 82 are arranged on the floor plate 31A corresponding to the frame-side brackets 81, and pin connecting holes 82A, 82A, ... Are bored in the thickness direction thereof. There is.

Thus, in this embodiment having such a configuration, it is possible to obtain substantially the same operational effects as those of the fifth embodiment described above.

In each of the above-mentioned embodiments, the frame-side brackets 33 (42, 71, 81) are separated from each other in the left-right direction of the cab main body 31, and the cab-side brackets 32 (41, 82) and the frames are separated from each other. The case where the side brackets 33 (42, 71, 81) are connected by the connecting pins 36 extending in the left-right direction has been described as an example, but the present invention is not limited to this, and for example, the frame side brackets 33 (42). , 71, 81) are separated from each other in the front-rear direction of the cab main body 31, and each cab-side bracket 32 (41, 82) and each frame-side bracket 33 (42, 71, 81) extend in the front-rear direction. You may make it connect with the connecting pin 36.

[0049]

[Effect of device]

 As described in detail above, according to the present invention, a cab-side bracket is provided so as to project from the floor plate of the cab body toward the frame side, and the frame is provided on the floor plate side of the cab corresponding to the cab bracket. The frame-side bracket is projected toward the frame-side bracket, and the vibration-proof bush is inserted into at least one of the pin-connecting hole of the frame-side bracket and the pin-connecting hole of the cab-side bracket. Since the frame side bracket and the driver's cab side bracket are connected by inserting the connecting pin into the, the vibrations of the working machine during running and working are transmitted to the driver's cab body through the frame in the vertical direction. At this time, the vibration-proof bushes are elastically deformed in the radial direction by the vibrations, and the vibration-proof bushes can absorb and damp the vibrations in the vertical direction and the like.

Further, if a vibration damping plate made of an elastic material for vibration damping is provided between the frame side bracket and the cab side bracket, the vibration transmitted from the left and right directions of the frame is Since the vibration-proof plate is transmitted in the thickness direction of the plate and elastically deforms, the vibration-proof plate at this time can absorb and damp vibrations in the left-right direction and the like.

Therefore, even if a large vibration is transmitted to the frame or a lateral vibration is transmitted to the frame, the vibration transmitted from the frame side bracket to the cab side bracket can be effectively damped. Moreover, vibrations from all directions transmitted to the floor plate of the cab body can be attenuated, and the riding comfort and driving operability of the vehicle can be improved.

[Brief description of drawings]

FIG. 1 is an overall view showing a hydraulic excavator according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line II-II in FIG.

FIG. 3 is an enlarged sectional view similar to FIG. 2, showing a second embodiment of the present invention.

FIG. 4 is an enlarged sectional view similar to FIG. 2, showing a third embodiment of the present invention.

FIG. 5 is an enlarged sectional view similar to FIG. 2, showing a fourth embodiment of the present invention.

FIG. 6 is an enlarged sectional view similar to FIG. 2, showing a fifth embodiment of the present invention.

FIG. 7 is an enlarged sectional view similar to FIG. 2, showing a sixth embodiment of the present invention.

FIG. 8 is an overall view showing a hydraulic excavator according to a conventional technique.

FIG. 9 is a partially cutaway front view showing a cab according to a conventional technique.

10 is an enlarged cross-sectional view taken along line X-X in FIG.

[Explanation of symbols]

 31 Driver's cab main body 31A Floor plate 32, 41, 82 Driver's cab side bracket 32A, 41A, 81A Pin connection hole 33, 42, 71, 81 Frame side bracket 33A, 71A, 42A pin connection hole 34 Revolving frame (frame) 35, 43 , 72 Anti-vibration bush 36 Connection pin 51, 61, 73 Anti-vibration plate

Claims (2)

[Scope of utility model registration request] 1. A frame of a working machine, a box-shaped driver's cab main body disposed on the frame, and a driver's cab projecting from the driver's cab main body toward the frame and having pin connection holes formed therein. Side brackets, frame side brackets protruding from the frame toward the cab side corresponding to the cab side brackets, and having pin connection holes formed therein, and formed in a tubular shape with an elastic material for vibration isolation. An anti-vibration bush inserted into at least one of the pin connection hole of the frame side bracket and the pin connection hole of the driver's cab side bracket; An operator's cab of a working machine that is composed of a connecting pin that connects the side bracket. 2. A vibration-proof plate formed in a plate shape from a vibration-proof elastic material is provided between the frame-side bracket and the cab-side bracket. The cab of the work machine.