JP7098484B2 - Construction machinery cab - Google Patents

Description

The present invention relates to the cab of a construction machine.

Patent Document 1 discloses an cab attached to a swivel in a crane which is a construction machine. In this crane, the exterior frame of the driver's cab including the bottom plate is installed on the sliding frame, and the sliding frame engages with the tilting frame. Then, the tilting frame is connected to the swivel base via the tilting cylinder. By extending or contracting the tilting cylinder, the driver's cab is tilted and driven with respect to the swivel table. At this time, the sliding frame and the tilting frame tilt together with the driver's cab. Further, the driver's cab tilts from a horizontal or substantially horizontal state with respect to the swivel table so as to be located vertically above the front side.

Japanese Unexamined Patent Publication No. 10-87275

In Patent Document 1, a tilting frame or the like is provided separately from the exterior frame of the driver's cab. Then, a tilting cylinder that tilts and drives the driver's cab is attached between the separate frame and the swivel base. By providing a frame separate from the exterior frame of the cab, the cost in manufacturing increases and the weight of the cab and its vicinity increases.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a driver's cab that is tilt-driven without providing a frame separate from the exterior frame.

In order to achieve the above object, one aspect of the present invention is a driver's cab that is attached to a swivel in a construction machine and can be tilted with respect to the swivel so as to be located vertically above the front side, and is a top plate. An exterior frame including a bottom plate, a front plate, a rear plate, and a pair of side plates, and a portion provided on the outer surface of the rear plate, the vertically lower portion is located on the front side with respect to the vertically upper portion. A stepped surface that forms a step in the state, and a first bracket that is installed on the stepped surface and is connected to the swivel, and passes through a portion of the first bracket that is connected to the swivel. A first bracket that defines the tilting central axis of the cab along the width direction of the cab, a portion of the outer surface of the rear plate that is vertically below the stepped surface, and a bottom plate. A second bracket installed on at least one of the outer surfaces of the cab and extending along the width direction of the cab, to which a tilting cylinder for tilting the cab is connected. And a third bracket that is installed on the outer surface of the bottom plate on the front side of the second bracket and extends along the width direction of the cab. The cab is not tilted, and is provided with an engaging portion that engages with the pedestal-side engaging portion of the swivel. When the cab is tilted, the pedestal-side engaging portion of the engaging portion is engaged. A third bracket, which is disengaged from the joint, is provided.

According to the present invention, it is possible to provide a driver's cab that is tilted and driven without providing a frame separate from the exterior frame.

FIG. 1 is a schematic view showing a crane according to the first embodiment. FIG. 2 is a perspective view schematically showing a configuration in the vicinity of the driver's cab in the swivel according to the first embodiment, omitting the driver's cab. FIG. 3 is a perspective view schematically showing the configuration of the driver's cab according to the first embodiment and the vicinity of the driver's cab in the swivel table. FIG. 4 is a perspective view schematically showing the configuration of the driver's cab according to the first embodiment and the vicinity of the driver's cab on the swivel table in a state viewed from a direction different from that of FIG. FIG. 5 is a schematic view showing the configuration of the driver's cab according to the first embodiment and the vicinity of the driver's cab in the swivel table as viewed from the right side in the width direction of the driver's cab. FIG. 6 is a perspective view schematically showing the configuration of the driver's cab according to the first embodiment. FIG. 7 is a schematic diagram illustrating a connection structure of a bracket (first bracket) in the driver's cab to the relay portion of the swivel table according to the first embodiment. FIG. 8 is a schematic view illustrating the connection structure of the tilting cylinder to the cylinder connection portion of the driver's cab according to the first embodiment. FIG. 9 is a schematic view illustrating the connection structure of the tilting cylinder to the table side connection portion of the swivel table according to the first embodiment. FIG. 10 is a schematic view showing a state in which each of the engaging portions of the driver's cab according to the first embodiment is engaged with the corresponding one of the pedestal side engaging portions. FIG. 11 is a schematic view showing an example of a system for controlling traveling in the crane according to the first embodiment. FIG. 12 is a flowchart showing control regarding the traveling of the crane, which is performed by the controller of the example of FIG. FIG. 13 is a schematic view showing an example of a system for controlling the slide deck in the crane according to the first embodiment. FIG. 14 is a flowchart showing the control regarding the slide deck performed by the controller of the example of FIG.

Embodiments of the present invention will be described with reference to FIGS. 1 to 14.

FIG. 1 shows a crane 1 which is a construction machine according to the first embodiment. As shown in FIG. 1, the crane 1 includes a traveling vehicle body 2 and a swivel body 3 installed on the traveling vehicle body 2. The turning body 3 can turn with respect to the traveling vehicle body 2 about a turning axis R parallel to or substantially parallel to the vertical direction (directions indicated by arrows Z1 and Z2). The swivel body 3 includes a swivel table 5, an cab 6 attached to the swivel table 5, and a boom 7 connected to the swivel table 5. In the swivel body 3, it intersects in the vertical direction (vertical or substantially vertical) in the front-rear direction (direction indicated by the arrows X1 and X2) and in both the vertical direction and the front-rear direction (vertical or substantially vertical). ) The width direction is specified. FIG. 1 shows the swivel body 3 in a state of being viewed from the left side in the width direction. Further, FIG. 1 shows a state in which the front side of the turning body 3 coincides with or substantially coincides with the front side of the traveling vehicle body 2.

The swivel base 5, the driver's cab 6, and the boom 7 swivel together about the swivel shaft R. The boom 7 can be undulated with respect to the swivel base 5. In the present embodiment, the boom 7 is a multi-stage boom and can be expanded and contracted in the longitudinal direction. Further, the boom 7 is arranged at the center of the swivel body 3 in the width direction. In FIG. 1, the boom 7 is shown in a prone state with respect to the swivel table 5, and is shown in a horizontal or substantially horizontal state with respect to the swivel table 5. The driver's cab 6 can be tilted from a state of being horizontal or substantially horizontal to the swivel table 5. The driver's cab 6 is tilted from a horizontal or substantially horizontal state to a state where it is located vertically above (arrow Z1 side) toward the front side (arrow X1 side). Further, in the present embodiment, the driver's cab 6 is arranged on the left side of the boom 7 in the width direction. In FIG. 1, the driver's cab 6 is shown in a horizontal or substantially horizontal state with respect to the swivel table 5 and is shown in a non-tilted state.

FIG. 2 shows the configuration of the swivel table 5 in the vicinity of the driver's cab 6 by omitting the driver's cab 6. 3 to 5 show the configuration of the driver's cab 6 and the swivel table 5 in the vicinity of the driver's cab 6. 3 and 4 are perspective views viewed from different directions with respect to each other, and show a state in which the driver's cab 6 is tilted from a horizontal or substantially horizontal state. Further, FIG. 6 shows the configuration of the driver's cab 6. Similarly to the swivel body 3, the driver's cab 6 also defines the front-rear direction (direction indicated by the arrow X1 and the arrow X2) and the width direction (direction indicated by the arrow W1 and the arrow W2). The front-rear direction of the driver's cab 6 coincides with or substantially coincides with the front-rear direction of the swivel body 3. The width direction of the driver's cab 6 coincides with or substantially coincides with the width direction of the swivel body 3. In FIG. 5, the driver's cab 6 is shown in a state viewed from the right side (arrow W2 side) in the width direction, and is shown in a horizontal or substantially horizontal state with respect to the swivel table 5.

As shown in FIGS. 3 to 6, the driver's cab 6 includes an exterior frame 10. In the driver's cab 6, an internal space is formed inside the exterior frame 10. In the internal space, various operations such as raising and lowering the boom 7 are performed by an operator or the like. The exterior frame 10 includes a top plate 11, a bottom plate 12, a front plate 13, a rear plate 15, and a pair of side plates 16 and 17 (left side plate 16 and right side plate 17). The top plate 11 and the bottom plate 12 are arranged apart from each other in the vertical direction (directions indicated by arrows Z1 and Z2) with the internal space interposed therebetween, and face each other. The front plate 13 and the rear plate 15 are arranged apart from each other in the front-rear direction with the internal space interposed therebetween, and face each other. The pair of side plates 16 and 17 are arranged apart from each other in the width direction with the internal space interposed therebetween, and face each other.

The outer surface of the top plate 11 faces vertically upward (arrow Z1 side), and the outer surface of the bottom plate 12 faces vertically lower side (arrow Z2 side). Further, the outer surface of the front plate 13 faces the front side (arrow X1 side), and the outer surface of the rear plate 15 faces the rear side (arrow X2 side). The outer surface of the side plate 16 faces the left side (arrow W1 side), and the outer surface of the side plate 17 faces the right side (arrow W2 side). Therefore, the outer surfaces of the side plates 16 and 17 face the outside of the cab 6 in the width direction. A door 18 is attached to the side plate (left side plate) 16. Workers and the like get on the internal space of the driver's cab 6 or get off from the internal space of the driver's cab 6 through the door 18.

A stepped surface 21 is formed on the outer surface of the rear plate 15. The step surface 21 forms a step in a state where the vertically lower portion is located on the front side with respect to the vertically upper portion. That is, on the outer surface of the rear plate 15, the portion vertically below the step surface 21 is recessed forward as compared with the portion vertically above the step surface 21. By forming the stepped surface 21 as described above, the stepped surface 21 is formed so as to face vertically downward. The step surface 21 is formed at the center of the rear plate 15 in the vertical direction. Further, the stepped surface 21 is formed along the width direction of the driver's cab 6 and is formed over most of the entire dimensions between the side plates 16 and 17 in the width direction. However, the stepped surface 21 is arranged between the side plates 16 and 17, and is arranged inside the side plates 16 and 17 in the width direction.

On the outer surface of the rear plate 15, brackets (first brackets) 22A and 22B are installed on the stepped surface 21. The bracket 22A is installed at one end of the step surface 21 in the width direction of the driver's cab 6 and is installed in the vicinity of the side plate 16. Further, the bracket 22B is installed at an end portion of the step surface 21 opposite to the side on which the bracket 22A is located in the width direction, and is installed in the vicinity of the side plate 17. However, the brackets 22A and 22B are arranged between the side plates 16 and 17, and are arranged inside the side plates 16 and 17 in the width direction of the cab 6. Further, the bracket 22A is formed with a pin hole 23A along the width direction of the driver's cab 6, and the bracket 22B is formed with a pin hole 23B along the width direction of the driver's cab 6.

As shown in FIG. 2 and the like, the swivel table 5 is provided with a base portion 25 and relay portions 26A and 26B. The bracket 22A is connected to the relay unit 26A, and the bracket 22B is connected to the relay unit 26B. By connecting each of the brackets 22A and 22B to the corresponding one of the relay portions 26A and 26B, the tilting center axis (tilted fulcrum axis) Y of the cab 6 is defined. The driver's cab 6 tilts (rotates) with respect to the swivel base 5 about the tilt center axis Y. The tilting center axis Y is along the width direction of the driver's cab 6. Further, the tilting center axis Y passes through the connection portion of the bracket 22A to the relay portion 26A and the connection portion of the bracket 22B to the relay portion 26B.

FIG. 7 is a diagram illustrating a connection structure of the brackets (first brackets) 22A and 22B of the driver's cab 6 to the relay portions 26A and 26B of the swivel base 5. As shown in FIGS. 2 and 7, the relay unit 26A has a pin hole 27A along the width direction of the cab 6, and the relay unit 26B has a pin hole 27B along the width direction of the cab 6. It is formed. By inserting the pin 28A into the pin holes 23A and 27A, the bracket 22A is connected to the relay portion 26A of the swivel base 5. Then, by inserting the pin 28B into the pin holes 23B and 27B, the bracket 22B is connected to the relay portion 26B of the swivel base 5. In the present embodiment, the pin 28A is inserted into the pin holes 23A and 27A from the inside in the width direction of the cab 6, and the pin 28B is inserted into the pin holes 23B and 27B from the inside in the width direction of the cab 6. To. Further, in the present embodiment, the central axes of the pin holes 23A, 23B, 27A, 27B and the pins 28A, 28B are coaxial or substantially coaxial with the tilting central axis Y.

In the swivel base 5, the relay portion 26B is fixed to the base portion 25. The relay portion 26A is attached to the base portion 25 via the bolts 38A and 38B. When the bolts 38A and 38B are loosened, the relay portion 26A can move in the front-rear direction of the driver's cab 6 with respect to the base portion 25. By making the relay unit 26A movable in the front-rear direction of the driver's cab 6, when connecting the brackets 22A and 22B of the driver's cab 6 to the swivel table 5, manufacturing errors of the driver's cab 6 and the swivel table 5 and the like are eliminated. , Can be absorbed. As a result, labor and the like can be reduced in the work of connecting the brackets 22A and 22B to the swivel base 5.

As shown in FIG. 6 and the like, a bracket (second bracket) 30 is installed at the rear end of the outer surface of the bottom plate 12, and a bracket (second bracket) is installed at the lower end of the outer surface of the rear plate 15. ) 31 is installed. The brackets 30 and 31 are installed at the boundary between the outer surface of the bottom plate 12 and the outer surface of the rear plate 15. Each of the brackets 30 and 31 extends along the width direction of the cab 6 and is formed over most of the entire dimensions between the side plates 16 and 17 in the width direction. However, the brackets 30 and 31 are arranged between the side plates 16 and 17, and are arranged inside the side plates 16 and 17 in the width direction. In some embodiments, the brackets 30 and 31 do not need to be provided at the boundary between the outer surface of the bottom plate 12 and the outer surface of the rear plate 15. A bracket (second bracket) similar to the brackets 30, 31 and the like is provided on the outer surface of the rear plate 15 at least one of the portion vertically below the step surface 21 and the outer surface of the bottom plate 12. Just do it.

The brackets 30 and 31 are provided with cylinder connecting portions (cab side cylinder connecting portions) 33A and 33B to which the tilting cylinder 32 is connected. The tilting cylinder 32 is an actuator that tilts and drives the driver's cab 6, and for example, a hydraulic cylinder is used. The cylinder connecting portions 33A and 33B are formed at the central portions of the brackets 30 and 31 in the width direction of the cab 6. The cylinder connecting portions 33A and 33B are arranged between the side plates 16 and 17, and are arranged inside the side plates 16 and 17 in the width direction of the cab 6. In the tilting cylinder 32, one of the rod side and the tube side is connected to the cylinder connecting portions 33A and 33B, and in one embodiment, the rod side is connected to the cylinder connecting portions 33A and 33B.

FIG. 8 is a diagram illustrating a connection structure of the tilting cylinder 32 to the cylinder connecting portions 33A and 33B of the driver's cab 6. As shown in FIGS. 6 and 8, the cylinder connecting portions 33A and 33B are arranged apart from each other in the width direction of the cab 6. The tilting cylinder 32 is arranged between the cylinder connecting portions 33A and 33B in the width direction of the cab 6. In this embodiment, the tilting cylinder 32 is connected to the cab 6 via a pin 35. The pin 35 has a central axis P1 along the width direction of the driver's cab 6 and extends along the central axis P1. Then, the pin 35 is attached to the tilting cylinder 32 in a state of penetrating the tilting cylinder 32 in the width direction of the driver's cab 6. Further, a pin hole 36A along the width direction of the cab 6 is formed in the cylinder connection portion 33A, and a pin hole 36B along the width direction of the cab 6 is formed in the cylinder connection portion 33B. By inserting the pin 35 into the pin holes 36A and 36B, the tilting cylinder 32 is connected to the cylinder connecting portions 33A and 33B. In a state where the tilting cylinder 32 is connected to the cylinder connecting portions 33A and 33B via the pin 35 as described above, the tilting cylinder 32 can rotate about the central axis P1 of the pin 35 with respect to the cab 6. ..

As shown in FIG. 4 and the like, the tilting cylinder 32 extends rearward from the cylinder connecting portions 33A and 33B. Then, the tilting cylinder 32 is connected to the pedestal side connecting portion (pedestal side cylinder connecting portion) 37A and 37B of the swivel table 5 on the rear side with respect to the driver's cab 6. The tilting cylinder 32 is connected to the pedestal side connecting portions 37A and 37B on the rod side and the side of the tube side opposite to the side connected to the cab 6, and in one embodiment, the tube side is the pedestal side connecting portion 37A, It is connected to 37B.

FIG. 9 is a diagram illustrating a connection structure of the tilting cylinder 32 to the table side connection portions 37A and 37B of the swivel table 5. As shown in FIG. 9 and the like, the pedestal-side connecting portions 37A and 37B are arranged apart from each other in the width direction of the cab 6. Then, the tilting cylinder 32 is arranged between the table side connecting portions 37A and 37B in the width direction of the driver's cab 6. In the present embodiment, the tilting cylinder 32 is connected to the swivel base 5 via the pin 41 and the plates 42A and 42B. The pin 41 has a central axis P2 along the width direction of the driver's cab 6 and extends along the central axis P2. Then, the pin 41 is attached to the tilting cylinder 32 in a state of penetrating the tilting cylinder 32 in the width direction of the driver's cab 6. Further, a pin hole 43A along the width direction of the cab 6 is formed in the pedestal side connection portion 37A, and a pin hole 43B along the width direction of the cab 6 is formed in the pedestal side connection portion 37B. The pin 41 is inserted into the pin holes 43A and 43B.

In the pin 41, the plate 42A is attached to one end in the direction along the central axis P2, and the plate 42B is attached to the end opposite to the side on which the plate 42A is attached in the direction along the central axis P2. Then, the plate 42A is attached to the pedestal side connecting portion 37A via the screw 45A, and the plate 42B is attached to the pedestal side connecting portion 37B via the screw 45B, so that the tilting cylinder 32 is attached to the pedestal side connecting portion 37A, It is connected to 37B. The plate 42A abuts on the pedestal side connection portion 37A from the outside in the width direction of the cab 6, and the plate 42B abuts on the pedestal side connection portion 37B from the outside in the width direction of the cab 6. Further, the plate 42A has a central axis Q1 along the width direction of the cab 6, and the plate 42B has a central axis Q2 along the width direction of the cab 6. In a state where the tilting cylinder 32 is connected to the base side connecting portions 37A and 37B via the pin 41 and the plates 42A and 42B as described above, the tilting cylinder 32 connects the central axis P2 of the pin 41 to the swivel base 5. It can rotate as a center.

The central axis Q1 of the plate 42A is eccentric with respect to the central axis P2 of the pin 41. Further, the central axis Q2 of the plate 42B is eccentric with respect to the central axis P2 of the pin 41. Therefore, when the plates 42A and 42B are not attached to the swivel base 5, the pin 41 rotates around the axis of the central axis P2, so that the central axis Q1 of the plate 42A and the central axis Q2 of the plate 42B become the pin 41. Rotates around the central axis P2 of. When the central axis (Q1; Q2) of each of the plates 42A and 42B is eccentric with respect to the central axis P2 of the pin 41, the cab 6 is connected to the swivel base 5 via the tilting cylinder 32. It is possible to absorb manufacturing errors of the chamber 6 and the tilting cylinder 32 and the like. As a result, the driver's cab 6 can be properly assembled. Further, in the work of connecting the driver's cab 6 to the swivel table 5 via the tilting cylinder 32, labor and the like are reduced.

Further, in the present embodiment, the anti-vibration rubber 46A is arranged between the tilting cylinder 32 and the pedestal side connecting portion 37A, and the anti-vibration rubber 46B is arranged between the tilting cylinder 32 and the pedestal side connecting portion 37B. Therefore, especially when the vibration-proof rubbers 58A and 58B, which will be described later, are crushed (acted) due to vibration during traveling or the like, damage to the cab 6 and the tilting cylinder 32 is effectively prevented.

In the present embodiment, the tilting cylinder 32 is connected to the cab 6 and the swivel base 5 as described above. In such a configuration, the cab 6 is tilted and driven with respect to the swivel base 5 by expanding or contracting the tilting cylinder 32. That is, when the tilting cylinder 32 is operated, the driver's cab 6 tilts with respect to the swivel base 5 about the tilting center axis Y. For example, by extending the tilting cylinder 32 from a state in which the driver's cab 6 is horizontal or substantially horizontal to the swivel table 5, the driver's cab 6 is tilted to a state in which it is located vertically upward toward the front side. That is, the cab 6 is tilted so that the outer surface of the front plate 13 faces vertically upward.

As shown in FIG. 6 and the like, a bracket (third bracket) 51 is installed on the outer surface of the bottom plate 12. The bracket 51 is installed in the bottom plate 12 on the front side with respect to the bracket 30, and in the present embodiment, it is installed in the central portion of the bottom plate 12 in the front-rear direction. In an example such as FIG. 6, the bracket 51 is located slightly forward of the center position of the bottom plate 12 in the front-rear direction. The bracket 51 extends along the width direction of the cab 6 and is formed over most of all dimensions between the side plates 16 and 17 in the width direction. However, the bracket 51 is arranged between the side plates 16 and 17, and is arranged inside the side plates 16 and 17 in the width direction.

The bracket 51 is provided with engaging portions (cab-side engaging portions) 52A and 52B. The engaging portions 52A and 52B may be formed integrally with the bracket 51, or may be a separate member from the bracket 51. The engaging portions 52A and 52B are arranged apart from each other in the width direction of the cab 6. The engaging portion 52A is arranged on one side of the center position of the bottom plate 12 in the width direction of the driver's cab 6, and in the present embodiment, is arranged on the left side of the center position of the bottom plate 12. The engaging portion 52B is arranged on the side opposite to the side where the engaging portion 52A is located with respect to the central position of the bottom plate 12 in the width direction of the driver's cab 6. In the present embodiment, the engaging portion 52B is arranged at the central position of the bottom plate 12. It is placed on the right side of the. However, the engaging portions 52A and 52B are arranged between the side plates 16 and 17, and are arranged inside the side plates 16 and 17 in the width direction of the cab 6.

Further, the swivel table 5 is provided with a table side bracket 53. The table side bracket 53 is arranged vertically below the bottom plate 12 of the driver's cab 6. The pedestal side bracket 53 is provided with pedestal side engaging portions 55A and 55B. The pedestal-side engaging portions 55A and 55B may be formed integrally with the pedestal-side bracket 53, or may be a separate member from the pedestal-side bracket 53. The pedestal-side engaging portions 55A and 55B are arranged apart from each other in the width direction of the driver's cab 6. The pedestal side engaging portion 55A is arranged on the side where the engaging portion 52A is located with respect to the center position of the bottom plate 12 in the width direction of the driver's cab 6, and in the present embodiment, it is left with respect to the center position of the bottom plate 12. It is placed on the side. The pedestal-side engaging portion 55B is arranged on the side where the engaging portion 52B is located with respect to the center position of the bottom plate 12 in the width direction of the driver's cab 6, and in the present embodiment, with respect to the center position of the bottom plate 12. Is placed on the right side.

When the cab 6 is not tilted, that is, when the cab 6 is horizontal or substantially horizontal to the swivel table 5, the engaging portion 52A engages with the pedestal side engaging portion 55A and the engaging portion 52B. Engages with the pedestal side engaging portion 55B. Therefore, in the non-tilted state in which the cab 6 is not tilted, the cab 6 is supported by the pedestal-side engaging portions 55A and 55B. Then, when the driver's cab 6 is tilted from a state where the driver's cab 6 is horizontal or substantially horizontal to the swivel table 5, the engagement of the engaging portion 52A with the pedestal-side engaging portion 55A is released, and the engaging portion is released. The engagement of the 52B with the pedestal side engaging portion 55B is released.

FIG. 10 shows a state in which each of the engaging portions 52A and 52B is engaged with the corresponding one of the pedestal side engaging portions 55A and 55B. As shown in FIGS. 6 and 10, each of the engaging portions 52A and 52B is formed in a cylindrical shape along the front-rear direction of the cab 6. Further, a groove 57A is formed in the pedestal side engaging portion 55A, and a groove 57B is formed in the pedestal side engaging portion 55B. Each of the grooves 57A and 57B has a U-shape or a substantially U-shape when viewed from the front side and the rear side of the driver's cab 6. Each of the grooves 57A and 57B is formed in a shape into which one of the engaging portions 52A and 52B can be fitted. When the cab 6 is not tilted, the engaging portion 52A fits into the groove 57A, so that the engaging portion 52A engages with the pedestal side engaging portion 55A. Then, when the driver's cab 6 is not tilted, the engaging portion 52B fits into the groove 57B, so that the engaging portion 52B engages with the pedestal side engaging portion 55B.

In the present embodiment, as described above, in a state where the cab 6 is not tilted, the bottom plate of the cab 6 is formed by the pedestal side engaging portions 55A and 55B at the portion on the front side with respect to the cylinder connecting portions 33A and 33B. 12 is supported. Therefore, in a state where the cab 6 is not tilted, rolling and skidding of the cab 6 are effectively prevented when the swivel body 3 including the swivel base 5 and the cab 6 is swiveled. Further, in the present embodiment, the engaging portions 52A and 52B are provided on both sides with respect to the center position of the bottom plate 12 in the width direction of the driver's cab 6. Then, in a state where the driver's cab 6 is horizontal or substantially horizontal to the swivel table 5, each of the engaging portions 52A and 52B is supported by the corresponding one of the table side engaging portions 55A and 55B. Therefore, in a state where the cab 6 is not tilted, skidding of the cab 6 when turning the swivel body 3 is more effectively prevented.

Further, in the present embodiment, the pedestal side engaging portion 55A is installed on the pedestal side bracket 53 via the anti-vibration rubber 58A, and the pedestal side engaging portion 55B is attached to the pedestal side bracket 53 via the anti-vibration rubber 58B. Will be installed. Since the anti-vibration rubbers 58A and 58B, which are cushioning materials, are provided, the vibration of the cab 6 is absorbed when the crane 1 travels in a state where the cab 6 is not tilted.

As described above, in the present embodiment, the brackets (first brackets) 22A and 22B are installed on the stepped surface 21 of the rear plate 15 of the driver's cab 6, and the brackets 22A and 22B are connected to the swivel base 5. , The tilting center axis Y of the driver's cab 6 is defined along the width direction of the driver's cab 6 through the brackets 22A and 22B. Further, brackets (second brackets) 30 and 31 are installed on the outer surface of the rear plate 15 on the portion vertically below the stepped surface 21 and on the outer surface of the bottom plate 12, and the driver's cab 6 is tilted and driven. The tilting cylinder 32 to be tilted is connected to the cylinder connecting portions 33A and 33B formed on the brackets 30 and 31. A bracket (third bracket) 51 is provided on the outer surface of the bottom plate 12 on the front side with respect to the bracket 30, and when the driver's cab 6 is not tilted, the engaging portions 52A and 52B of the bracket 51 are provided. Each engages with the corresponding one of the platform-side engaging portions 55A, 55B of the swivel platform 5. Due to such a configuration, the driver's cab 6 is tilted and driven without providing a frame separate from the exterior frame 10 (top plate 11, bottom plate 12, front plate 13, rear plate 15, and side plates 16, 17). Will be done. That is, it is not necessary to provide a separate frame between the exterior frame 10 of the driver's cab 6 and the swivel base 5. By not providing a frame separate from the exterior frame 10, the cost in manufacturing the crane 1 is reduced. In addition, the weight of the driver's cab 6 and its vicinity can be reduced.

Further, in a construction machine such as a crane 1, the vehicle height when traveling on a road is restricted by laws and regulations. In the present embodiment, as described above, a frame separate from the exterior frame 10 is not provided on the vertically lower side of the bottom plate (floor plate) 12. Therefore, even with the crane 1 in which the vehicle height during traveling is limited, it is possible to increase the space between the top plate 11 and the bottom plate 12 in the driver's cab 6. That is, a large dimension in the vertical direction of the internal space of the driver's cab 6 is secured.

In the driver's cab 6, the stepped surface 21 on which the brackets (first brackets) 22A and 22B are installed has a certain degree of strength. Further, the portions where the cylinder connecting portions 33A and 33B are provided are also the corner portions between the bottom plate 12 and the rear plate 15 and their vicinity thereof, and the strength is high to some extent. Further, at the boundary between the bottom plate 12 and the rear plate 15 where the cylinder connecting portions 33A and 33B are provided, the strength is improved by the brackets (second brackets) 30 and 31 along the width direction of the cab 6. The engaging portions 52A and 52B also have high strength to some extent due to the bracket (third bracket) 51 along the width direction of the driver's cab 6. Therefore, the strength of the cab 6 is sufficiently secured with respect to the configuration in which the cab 6 is tilted.

Further, in the present embodiment, only the brackets 22A and 22B, the brackets 30 and 31 including the cylinder connecting portions 33A and 33B, and the bracket 51 including the engaging portions 52A and 52B are formed in the cab 6, and the cab 6 is formed. The structure that can be tilted is realized, and the strength of the cab 6 is secured. Therefore, a configuration in which the driver's cab 6 can be tilted is realized without complicating the structure, and the strength of the driver's cab 6 is ensured.

Further, in a construction machine such as a crane 1, the width of a vehicle when traveling on a road is restricted by laws and regulations. In the present embodiment, as described above, the stepped surface 21, the brackets 22A and 22B, the brackets 30 and 31 including the cylinder connecting portions 33A and 33B, and the bracket 51 including the engaging portions 52A and 52B are each in the width direction. Is arranged inside with respect to the side plates 16 and 17. Therefore, even in the crane 1 in which the vehicle width during traveling is limited, it is possible to increase the space between the side plates 16 and 17 in the driver's cab 6. That is, a large dimension in the width direction of the internal space of the driver's cab 6 is secured.

In the present embodiment, as shown in FIGS. 2 and 3, a switch 61 is provided as a sensor on the table side bracket 53 of the swivel table 5. The switch 61 is a proximity switch and is provided in the vicinity of the pedestal side engaging portions 55A and 55B. The switch 61, which is a sensor, detects whether or not the driver's cab 6 is tilted from a horizontal or substantially horizontal state. When the driver's cab 6 is horizontal or substantially horizontal to the swivel table 5, that is, in a non-tilted state where the driver's cab 6 is not tilted, the switch 61 is turned on. On the other hand, when the driver's cab 6 is tilted from a horizontal or substantially horizontal state, the switch 61 is turned off. The sensor is not limited to the switch 61 as long as it can detect whether or not the driver's cab 6 is tilted from a horizontal or substantially horizontal state.

Further, the crane 1 of the present embodiment includes a slide deck 62. The slide deck 62 is slidable between the retracted state and the overhanging state. In the stored state, the slide deck 62 is stored vertically below the bottom plate 12 of the exterior frame 10 of the driver's cab 6. Further, in the overhanging state, the slide deck 62 is extended outward in the width direction of the driver's cab 6 from the lower end of one of the side plates 16 and 17 to which the door 18 is attached. In the present embodiment, the slide deck 62 is extended to the left from the lower end of the side plate 16 in the overhanging state. By projecting the slide deck 62, even in a large construction machine such as a large crane 1, it becomes easier for the worker to get into the internal space of the driver's cab 6 and to get off from the internal space of the driver's cab 6. ..

In the crane 1, control regarding the traveling of the crane 1 is performed based on whether or not the cab 6 is tilted and whether or not the slide deck 62 is stored. FIG. 11 shows an example of a system that controls traveling in the crane 1. In one example of FIG. 11, the crane 1 is provided with a switch 63 as a sensor in addition to the above-mentioned switch 61. The switch 63 is, for example, a proximity switch and is provided on the vertically lower side of the bottom plate 12 of the cab 6. The switch 63, which is a sensor, detects whether or not the slide deck 62 is stored. In the stored state in which the slide deck 62 is stored, the switch 63 is turned on. On the other hand, when the driver's cab 6 is tilted from a horizontal or substantially horizontal state, the switch 61 is turned off. The sensor is not limited to the switch 61 as long as it can detect whether or not the driver's cab 6 is tilted from a horizontal or substantially horizontal state.

Further, in the example of FIG. 11, the crane 1 is provided with the power supply 65 and the controller 66. The power supply 65 is a power supply different from the power supply used during work at the work site. Therefore, power can be supplied from the power supply 65 even when the work is not performed, that is, the power supply for work is turned off. The power supply 65 is installed in, for example, the traveling vehicle body 2.

The controller 66 includes a processor such as an integrated circuit or circuit configuration (circuitry) including a CPU (Central Processing Unit), an ASIC (Application specific integrated circuit), an FPGA (Field Programmable Gate Array), and the like, and a storage medium. In the controller 66, only one processor may be provided, or a plurality of processors may be provided. The processing in the processor is performed according to the program stored in the processor or the storage medium. Further, the storage medium stores a processing program used by the processor, parameters, functions, tables and the like used in the calculation by the processor. In one example of FIG. 11, the controller 66 controls the traveling. The controller 66 is mounted on, for example, the traveling vehicle body 2.

Further, in an example of FIG. 11, a relay circuit 70 is provided on the crane 1. The relay circuit 70 is installed in, for example, the swivel body 3. The relay circuit 70 includes a diode 71, an electromagnetic coil 72, and a switch 73. The diode 71 and the electromagnetic coil 72 are electrically connected in parallel with each other. Further, the switch 73 has contacts A1 to A3. In a state where no current flows through the electromagnetic coil 72 and the electromagnetic coil 72 is not excited, the contact A1 is electrically connected to the contact A3 in the switch 73. On the other hand, in a state where a current flows through the electromagnetic coil 72 and the electromagnetic coil 72 is excited, the contact A1 is electrically connected to the contact A2 in the switch 73.

In an example of FIG. 11, a current flows through the electromagnetic coil 72 in the ON state of the switch 63. Then, in the OFF state of the switch 63, no current flows through the electromagnetic coil 72. Further, in an example of FIG. 11, power is supplied to the switch 73 in the ON state of the switch 61. Then, in the OFF state of the switch 61, power is not supplied to the switch 73. Therefore, in one example of FIG. 11, the electric signal M1 is transmitted to the controller 66 and the electric signal M1 is input to the controller 66 only when both the switches 61 and 63 are in the ON state. That is, the electric signal M1 is input to the controller 66 only when the driver's cab 6 is not tilted from the horizontal state and the slide deck 62 is housed. When at least one of the switches 61 and 63 is in the OFF state, the electric signal M1 is not transmitted to the controller 66, and the electric signal M1 is not input to the controller 66. That is, in each of the cases where the driver's cab 6 is tilted from the horizontal state and the slide deck 62 is extended, the electric signal M1 is not input to the controller 66.

Further, in one example of FIG. 11, the traveling drive system 67 and the warning member 68 are provided on the crane 1. The controller 66 controls the traveling drive system 67 and the warning member 68 based on whether or not the electric signal M1 is input. By controlling the traveling drive system 67, the traveling speed of the crane 1 during traveling is adjusted. Further, the warning member 68 gives a warning by, for example, transmitting a sound, turning on a light, displaying a screen, or the like.
In one example, the switch 61 may be connected to the ground and the controller 66 may be connected to a power source such as the power source 65. In this example, the electric signal (M1) is output from the controller 66 through the switch 61 only when both the switches 61 and 63 are in the ON state. That is, the electric signal (M1) is output from the controller 66 only when the driver's cab 6 is not tilted from the horizontal state and the slide deck 62 is housed. When at least one of the switches 61 and 63 is in the OFF state, the electric signal (M1) is not output from the controller 66. That is, the electric signal (M1) is not output from the controller 66 in each of the cases where the driver's cab 6 is tilted from the horizontal state and the slide deck 62 is extended.

FIG. 12 is a flowchart showing control regarding the traveling of the crane 1 performed by the controller 66 of the example of FIG. As shown in FIG. 12, in the control related to traveling, the controller 66 determines whether or not the electric signal M1 is input (S101). When the electric signal M1 is input (S101-Yes), the controller 66 controls the traveling drive system 67 to cause the crane 1 to travel normally (S102). Therefore, the crane 1 is traveled at a normal traveling speed, and no speed limit is applied to the traveling speed of the crane 1. Further, when the electric signal M1 is input, the warning member 68 does not give a warning. On the other hand, when the electric signal M1 is not input (S101-No), the controller 66 activates the warning member 68 to give a warning (S103). Further, instead of or in addition to the warning, the controller 66 may control the traveling drive system 67 to limit the traveling speed of the crane 1 (S103). Due to the speed limit, the traveling speed of the crane 1 is maintained below a predetermined speed and is maintained at a low speed.

By performing the control as described above, only when the cab 6 is not tilted from the horizontal state and the slide deck 62 is housed, the crane 1 can normally run without warning. Will be done. Then, in each of the case where the driver's cab 6 is tilted from the horizontal state and the case where the slide deck 62 is extended, at least one of the warning and the speed limit of the traveling speed is performed.

Here, when traveling on a road such as a public road at a normal traveling speed, it is desired that the driver's cab 6 is not tilted from a horizontal or substantially horizontal state from the viewpoint of safety and legal compliance. There is. Therefore, in the crane 1 having the structure in which the cab 6 is tilted, it is necessary to prevent the crane 1 from traveling at a normal traveling speed while the cab 6 is tilted. In the present embodiment, as described above, when the driver's cab 6 is tilted from the horizontal state, at least one of the warning and the speed limit of the traveling speed is performed. The warning alerts the driver who is traveling at normal speed. In addition, the speed limit automatically prevents the vehicle from traveling at a normal traveling speed. Therefore, in the present embodiment, there is provided a crane (construction machine) 1 that effectively prevents the cab 6 from traveling at a normal traveling speed while being tilted.

Further, when traveling on a road at a normal traveling speed, it is desired that the slide deck 62 is not extended, that is, the slide deck 62 is stored, from the viewpoint of safety and legal compliance. It is rare. Therefore, in the crane 1 provided with the slide deck 62, it is necessary to prevent the crane 1 from traveling at a normal traveling speed with the slide deck 62 extended. In the present embodiment, as described above, when the slide deck 62 is extended, at least one of the warning and the speed limit of the traveling speed is performed. The warning alerts the driver who is traveling at normal speed. In addition, the speed limit automatically prevents the vehicle from traveling at a normal traveling speed. Therefore, in the present embodiment, there is provided a crane (construction machine) 1 that is effectively prevented from traveling at a normal traveling speed with the slide deck 62 extended.

In some embodiments, the slide deck 62 may not be provided. In this case, the controller 66 controls the traveling of the crane 1 based on whether or not the cab 6 is tilted from the horizontal state. Then, the controller 66 performs at least one of the warning and the speed limit of the traveling speed when the driver's cab 6 is tilted from the horizontal state.

Further, in the above-mentioned control regarding the traveling of the crane 1 based on whether or not the cab 6 is tilted from the horizontal state, a frame separate from the exterior frame 10 of the cab 6 is provided, and the separate frame is provided. It is also applicable to a configuration connected to a swivel table (eg 5) via a tilting cylinder (eg 32). In this configuration, the separate frame tilts with respect to the swivel 5 together with the driver's cab 6. Further, the above-mentioned control regarding the traveling of the crane 1 based on whether or not the cab 6 is tilted from the horizontal state is performed by the crane 1 as shown in FIG. 1 in which the cab 6 during work is provided separately from the cab during traveling. Not only, it can be applied to a crane in which the cab during work (for example, 6) is also used as the cab during running.

In the present embodiment, as shown in FIG. 3 and the like, the auxiliary switch 83 is provided on the outer surface of the exterior frame 10 of the driver's cab 6. In an example such as FIG. 3, the auxiliary switch 83 is arranged at the lower end of the outer surface of the front plate 13. The auxiliary switch 83 can be operated outside the driver's cab 6. The auxiliary switch 83 can input an operation for storing the slide deck 62. However, the auxiliary switch 83 cannot be used to extend the slide deck 62. The auxiliary switch 83 is turned on when the operation for storing the slide deck 62 is input. Then, the auxiliary switch 83 is turned off when no operation is input.

In the crane 1 provided with the slide deck 62, control regarding the slide deck 62 is performed. FIG. 13 shows an example of a system that controls the slide deck 62 in the crane 1. In one example of FIG. 13, the crane 1 is provided with a power supply 75, an operation switch 76, and a diode 77 in addition to the auxiliary switch 83 described above. The power supply 75 is a power supply used during work at the work site, and is installed in, for example, the swivel body 3. The power supply 75 is in the ON state at the time of work, but is in the OFF state when the work is not performed. Therefore, power is not supplied from the power source 75 when the work is not performed.

The operation switch 76 can be operated in the internal space of the driver's cab 6. With the operation switch 76, it is possible to input an operation of extending the slide deck 62 and an operation of storing the slide deck 62. The operation switch 76 has contacts A4 to A6. In the state where the operation of extending the slide deck 62 is input, the contact A4 is electrically connected to the contact A5 in the operation switch 76. Further, in the state where the operation for storing the slide deck 62 is input, the contact A4 is electrically connected to the contact A6 in the operation switch 76. Then, in the state where no operation is input, the contact A4 is not electrically connected to any of the contacts A5 and A6 in the operation switch 76.

Further, in an example of FIG. 13, the crane 1 is provided with a controller 80, a motor 81, and a power supply 82. The power supply 82 is a power source different from the power supply 75 used during work at the work site. Therefore, power can be supplied from the power supply 82 even when the work is not performed, that is, the power supply 75 is OFF. The power supply 82 is installed in, for example, the traveling vehicle body 2, and is the same power supply as the power supply 65 of the example of FIG.

Similar to the controller 66 in the example of FIG. 11, the controller 80 includes a processor such as an integrated circuit or circuit configuration including a CPU, ASIC, FPGA, and the like, and a storage medium. In the controller 80, only one processor may be provided, or a plurality of processors may be provided. In one example of FIG. 13, the controller 80 controls the slide deck 62. The controller 80 is mounted on the traveling vehicle body 2, for example. Further, the motor 81 is an actuator that drives the slide deck 62. The controller 80 controls the slide deck 62 by controlling the drive of the motor 81. Further, the controller 80 has terminals E1 and E2.

Further, in an example of FIG. 13, relay circuits 85 and 90 are provided on the crane 1. The relay circuit 85 includes a diode 86, an electromagnetic coil 87 and a switch 88, and the diode 86 and the electromagnetic coil 87 are electrically connected in parallel with each other. Further, the switch 88 has contacts A7 to A9. In a state where no current flows through the electromagnetic coil 87 and the electromagnetic coil 87 is not excited, the contact A7 is electrically connected to the contact A9 in the switch 88. On the other hand, in a state where a current flows through the electromagnetic coil 87 and the electromagnetic coil 87 is excited, the contact A7 is electrically connected to the contact A8 at the switch 88.

Further, the relay circuit 90 includes a diode 91, an electromagnetic coil 92 and a switch 93, and the diode 91 and the electromagnetic coil 92 are electrically connected in parallel with each other. Further, the switch 93 has contacts A10 to A12. In a state where no current flows through the electromagnetic coil 92 and the electromagnetic coil 92 is not excited, the contact A10 is electrically connected to the contact A12 in the switch 93. On the other hand, in a state where a current flows through the electromagnetic coil 92 and the electromagnetic coil 92 is excited, the contact A10 is electrically connected to the contact A11 in the switch 93.

Further, in an example of FIG. 13, a switch 95 is provided as a sensor on the crane 1. The switch 95 detects whether the door 18 of the driver's cab 6 is open or closed. When the door 18 is open, the switch 95 is turned on. On the other hand, when the door 18 is closed, the switch 95 is turned off.

In the state where the operation for extending or retracting the slide deck 62 is input in the operation switch 76, the operation is not input in the auxiliary switch 83, and the auxiliary switch 83 is in the OFF state. Then, when the operation of extending the slide deck 62 is input to the operation switch 76, the electric signal N1 is transmitted to the controller 80 through the operation switch 76, and the electric signal N1 is input to the terminal E1 of the controller 80. On the other hand, when the operation for storing the slide deck 62 is input by the operation switch 76, the current from the power supply 75 flows through the diode 77 to the electromagnetic coil 87 of the relay circuit 85. As a result, the electric signal N2 is transmitted to the controller 80 through the switch 88, and the electric signal N2 is input to the terminal E2 of the controller 80.

Further, in the state where the operation for retracting the slide deck 62 is input in the auxiliary switch 83, the power supply 75 is in the OFF state, and power is not supplied from the power supply 75. When the door 18 is closed, the switch 95 is in the OFF state. Therefore, when the door 18 is closed and the operation is input in the auxiliary switch 83, the current from the power supply 82 does not flow to the electromagnetic coil 92 of the relay circuit 90, and the current from the power supply 82 passes through the switch 93. It flows through the electromagnetic coil 87 of the relay circuit 85. As a result, the electric signal N2 is transmitted to the controller 80 through the switch 88, and the electric signal N2 is input to the terminal E2 of the controller 80. On the other hand, when the door 18 is open, the switch 95 is in the ON state. Therefore, when the door 18 is opened and the operation is input in the auxiliary switch 83, the current from the power supply 82 flows to the electromagnetic coil 92 of the relay circuit 90, and the current from the power supply 82 is relayed through the switch 93. It does not flow to the electromagnetic coil 87 of the circuit 85. Therefore, the electric signal N2 is not input to the terminal E2 of the controller 80.

FIG. 14 is a flowchart showing the control regarding the slide deck 62 performed by the controller 80 of the example of FIG. As shown in FIG. 14, in the control related to the slide deck 62, the controller 80 determines whether or not the electric signal N1 is input to the terminal E1 (S111). When the electric signal N1 is input (S111-Yes), the controller 80 drives the motor 81 and overhangs the slide deck 62 (S112). That is, the slide deck 62 is extended and driven. When the electric signal N1 is not input (S111-No), the controller 80 determines whether or not the electric signal N2 is input to the terminal E2 (S113). When the electric signal N2 is input (S113-Yes), the controller 80 drives the motor 81 and stores the slide deck 62 (S114). That is, the slide deck 62 is retracted and driven. When the electric signal N2 is not input (S113-No), the controller 80 stops the driving of the motor 81 and stops the driving of the slide deck 62 (S115).

By performing the control as described above, the slide deck 62 is extended and driven by the input of the operation of extending the slide deck 62 by the operation switch 76. Then, the slide deck 62 is retracted and driven by the input of the operation for retracting the slide deck 62 by the operation switch 76. Further, even when the power supply 75 for work is turned off, the slide deck 62 is retracted and driven by inputting an operation by the auxiliary switch 83 while the door 18 is closed. However, even if an operation is input by the auxiliary switch 83 while the door 18 is open, the slide deck 62 is not driven.

As described above, in the present embodiment, the slide deck 62 is stored by the operation of the auxiliary switch 83. Therefore, even when the slide deck 62 is disembarked from the internal space of the driver's cab 6 with the slide deck 62 overhanging, the operator can store the slide deck 62 without getting on the internal space of the driver's cab 6 again.

Further, the auxiliary switch 83 can only be operated to store the slide deck 62, and cannot be operated to extend the slide deck 62. Therefore, it is possible to effectively prevent the slide deck 62 from being unintentionally extended. Further, in the present embodiment, the slide deck 62 is not driven even if an operation is input by the auxiliary switch 83 while the door 18 is open. This improves safety.

In a certain embodiment, the slide deck 62 may be retracted and driven by inputting an operation with the auxiliary switch 83 regardless of the opening and closing of the door 18. When this control is performed, the relay circuit 90 and the switch 95 of the example of FIG. 13 are not provided. Then, when the operation is input by the auxiliary switch 83 and the auxiliary switch 83 is in the ON state, a current flows through the electromagnetic coil 87 of the relay circuit 85 regardless of whether the door 18 is opened or closed. Therefore, when the auxiliary switch 83 is in the ON state, the electric signal N2 is input to the terminal E2 of the controller 80 regardless of whether the door 18 is opened or closed.

Further, the above-mentioned configuration and control can be applied to construction machines (working vehicles) other than the crane 1 such as excavators.

The present invention is not limited to the above embodiment, and can be variously modified at the implementation stage without departing from the gist thereof. In addition, each embodiment may be carried out in combination as appropriate, in which case the combined effect can be obtained. Further, the above-described embodiment includes various inventions, and various inventions can be extracted by a combination selected from a plurality of disclosed constituent requirements. For example, even if some constituent elements are deleted from all the constituent elements shown in the embodiment, if the problem can be solved and the effect is obtained, the configuration in which the constituent elements are deleted can be extracted as an invention.

The characteristic matters of the above-described embodiment are described below.
(Appendix 1)
With a swivel
A driver's cab that is attached to the swivel and can be tilted with respect to the swivel so that it is located vertically above the front side.
A sensor that detects whether or not the driver's cab is tilted with respect to the swivel table, and
A controller that controls driving based on the detection result of the sensor, and if the driver's cab is tilted with respect to the swivel table, a warning is given and the traveling speed is set to a predetermined speed or less. With a controller that does at least one of the restrictions,
Construction machinery equipped with.

1 ... Crane, 3 ... Swing body, 5 ... Swing table, 6 ... Driver's cab, 10 ... Exterior frame, 11 ... Top plate, 12 ... Bottom plate, 13 ... Front plate, 15 ... Rear plate, 16, 17 ... Side plate, 21 ... Step surface, 22A, 22B ... Bracket (first bracket), 30, 31 ... Bracket (second bracket), 32 ... Tilt cylinder, 33A, 33B ... Cylinder connection, 51 ... Bracket (third bracket) , 52A, 52B ... engaging part, 55A, 55B ... base side engaging part, 61 ... switch (sensor), 66 ... controller.

Claims (3)

A driver's cab that is attached to a swivel in a construction machine and can be tilted with respect to the swivel so that it is located vertically above the front side.
An exterior frame having a top plate, a bottom plate, a front plate, a rear plate, and a pair of side plates,
A stepped surface provided on the outer surface of the rear plate and forming a step in a state where the vertically lower portion is located on the front side with respect to the vertically upper portion.
A first bracket installed on the stepped surface and connected to the swivel, and the first bracket passing through the connection portion of the first bracket to the swivel and along the width direction of the cab. The first bracket that defines the tilting center axis of the cab,
On the outer surface of the rear plate, it is installed on at least one of the portion vertically below the stepped surface and the outer surface of the bottom plate, and is extended along the width direction of the cab. A second bracket having a cylinder connection portion to which a tilting cylinder for tilting the driver's cab is connected.
A third bracket installed on the outer surface of the bottom plate on the front side with respect to the second bracket and extending along the width direction of the cab, wherein the cab is a third bracket. It is provided with an engaging portion that engages with the pedestal-side engaging portion of the swivel in a non-tilted state, and when the cab is tilted, the engagement of the engaging portion with the pedestal-side engaging portion is released. With the third bracket to be
Driver's cab equipped with. The driver's cab according to claim 1, wherein the engaging portion of the third bracket fits into the pedestal-side engaging portion in a state where the driver's cab is not tilted. The stepped surface, the first bracket, the second bracket including the cylinder connecting portion, and the third bracket including the engaging portion are attached to the pair of side plates in the width direction of the cab. The driver's cab according to claim 1 or 2, which is arranged inside.

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