Construction machinery cab and construction machinery

Abstract

To improve the operability of gear shifting. [Solution] The cab 12 includes a first shift operation unit 30 and a second shift operation unit 50 provided separately from the first shift operation unit 30. The first shift operation unit 30 is configured to allow switching of the gear position between forward, neutral, and reverse. The second shift operation unit 50 is configured to allow changing the upper limit of the speed gear in forward.

Description

Technical Field

[0001] The present disclosure relates to a cab for a construction machine.

Background Art

[0002] Patent Document 1 discloses an operation device for a construction machine.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] An object of the present disclosure is to improve the operability of gear operations.

Means for Solving the Problem

[0005] The cab for a construction machine of the present disclosure includes: a first shift operation unit configured to be operable to switch a gear position between forward, neutral, and reverse; and a second shift operation unit configured to allow an operation of changing the upper limit of the speed stage in forward travel and a shift hold operation.

Effects of the Invention

[0006] According to the present disclosure, the operability of gear operations can be improved.

Brief Description of the Drawings

[0007] [Figure 1] This is a cross-sectional view of the inside of the cab as viewed from above. [Figure 2] This is an enlarged plan view showing the periphery of the first shift operation unit and the second shift operation unit. [Figure 3] This is an enlarged perspective view showing the first shift operation unit and the hoist operation unit. [Figure 4] This is a magnified perspective view of the second shift control unit. [Figure 5] This diagram shows the gear positions that can be changed by the first and second shift operation units. [Figure 6A] This is a perspective view showing the wiper control panel. [Figure 6B] This is a view of the wiper control unit from the direction of its protrusion. [Modes for carrying out the invention]

[0008] Preferred embodiments of this disclosure are described below.

[0009] Figure 1 shows a cab 12 according to this embodiment. The cab 12 is a cab of a construction machine, and more specifically, a cab of an articulated dump truck.

[0010] The cab 12 comprises a cab shell 40 that forms its outer casing, an operator's seat 21, a handle 23 located in front of the operator's seat 21, and a steering column 28 on which the handle 23 is mounted.

[0011] As shown in Figure 2, the cab 12 includes a first shift operation unit 30 provided on the other side in the width direction relative to the operator's seat 21, and a second shift operation unit 50 provided separately from the first shift operation unit 30.

[0012] (First shift operation unit 30) As shown in Figure 3, the first shift operation unit 30 is configured to allow switching between gear positions between forward, neutral, and reverse.

[0013] The first shift operation unit 30 is a lever-type operation unit. The first shift operation unit 30 can also be called a shift lever 30. The first shift operation unit 30 is configured to be movable in the forward and backward direction between the lever positions R, N, and D. R corresponds to the reverse gear position, N corresponds to the neutral gear position, and D corresponds to the forward gear position.

[0014] The first shift control unit 30 includes a grip section 31 for operation by pressing the palm of the operator against it, and a side button 32. The side button 32 is a button that, when pressed, allows the grip section 31 to move forward and backward from the N position. The side button 32 is provided so as to protrude from the grip section 31 to one side in the width direction. The side button 32 is operated by the operator's thumb.

[0015] The grip section 31 is equipped with a top surface 31A that has an area on which the operator's palm can be placed. The top surface 31A is substantially flat, but specifically it is slightly curved so as to be convex upwards. Within the area where the top surface 31A is formed, the curvature when viewed from the side is 0.013 (1 / mm) or less. Furthermore, the front-to-back dimension of the area where the top surface 31A is formed is 57 mm or more. This makes it easy to rest the palm and wrist on the top surface 31A.

[0016] The first shift control unit 30 is configured to allow switching between reverse gears. Specifically, the first shift control unit 30 has a switch button 33 that allows switching between reverse gears. There are a total of two reverse gears, and each time the switch button 33 is pressed, the reverse gear switches between reverse 1st gear and reverse 2nd gear. The starting speed gear for reverse (default speed gear) is reverse 2nd gear. It is possible to switch the starting speed gear for reverse to reverse 1st gear by operating the control unit inside the cab 12 (for example, the monitor).

[0017] The selector button 33 has the function of switching the starting speed gear when moving forward. Under normal conditions, when the gear position is changed to forward, the starting speed gear is set automatically. The automatic setting of the starting speed gear is determined by the construction machine's controller based on the slope of the road surface and the load. By pressing the selector button 33, the starting speed gear is switched to a specific gear (for example, 1st gear). By pressing the selector button 33 again, the starting speed gear is switched back to the automatic setting.

[0018] When an operation to change to the neutral gear position is performed via the first shift operation part 30, the brake device is controlled so that the stopped state is maintained.

[0019] (Second shift operation part 50) The second shift operation part 50 is configured to allow an operation to change the upper limit of the speed stage for forward travel. The total number of speed stages for forward travel is 8. In the construction machine, the speed stage is automatically changed by automatic control within a range not exceeding the set upper limit of the speed stage. Note that automatic gear shifting by automatic control is not performed for reverse travel. Changing the speed stage for reverse travel can be performed by operating the second shift operation part 50.

[0020] The second shift operation part 50 is a lever-type operation part, and is provided so as to protrude from the steering column 28. Thereby, the second shift operation part 50 is provided at a position that can be operated without releasing the hand from the steering wheel 23. The second shift operation part 50 may also be referred to as a selector lever 50. The selector lever 50 is a momentary lever, and has a characteristic of automatically returning to the original position after operation.

[0021] The direction in which the second shift operation part 50 protrudes from the steering column 28 is one side in the width direction. That is, the second shift operation part 50 is provided near the left side with respect to the center of the steering wheel 23. Thereby, the second shift operation part 50 is arranged at a position to be operated by a hand on the opposite side to the hand that operates the first shift operation part 30.

[0022] The second shift operation part 50 is configured to allow an operation to raise the upper limit of the speed stage by a predetermined number of stages from the current upper limit of the speed stage, and an operation to lower the upper limit of the speed stage by a predetermined number of stages from the current upper limit of the speed stage. The predetermined number of stages is 1 stage for both the raising operation and the lowering operation.

[0023] The operation to raise the upper limit of the speed gear and the operation to lower the upper limit of the speed gear are performed by rotating the selector lever 50, which is the second shift operation unit 50, to one side and the other side in the direction of steering wheel rotation (see arrows A and B in Figure 4). Furthermore, by continuously operating the mechanism to increase the upper limit of the speed gear (by continuously pushing the selector lever 50 to one side in the direction of handle rotation), the upper limit of the speed gear can be set to the highest speed gear. Furthermore, by continuing to lower the upper limit of the speed gear (by continuously pushing the selector lever 50 to the other side in the direction of handle rotation), the upper limit of the speed gear can be set to the current speed gear.

[0024] The second shift operation unit 50 is configured to enable shift hold operation. Shift hold operation refers to the operation of fixing the speed gear to a specific speed gear and the operation of releasing that fixation. Shift hold operation is performed by rotating the selector lever 50, which is the second shift operation unit 50, towards the operator (see arrow C in Figure 4).

[0025] (Hoist operation unit 60) The cab 12 is equipped with a hoist operating unit 60 for operating the dump body (the cargo bed of the dump truck).

[0026] The hoist control unit 60 is positioned in front of and near the first shift control unit 30. This configuration allows the hoist control unit 60 to be operated with the same fingers as the hand used to operate the first shift control unit 30.

[0027] The hoist control unit 60 is a lever-type control unit. The hoist control unit 60 can also be called the hoist lever 60. The hoist lever 60 is a lever that can be tilted in the forward and backward directions.

[0028] The hoist lever 60, which serves as the hoist control unit 60, has the following positions: lowered detent, lowered, float & hold, raised, and raised detent. The lowered detent (first position) is the position where the lever is tilted forward until it clicks into place. When operated to this position, the dump body automatically lowers to its maximum position. • The lowered position (second position) is the position where the lever is tilted forward, and while in this position, the dump body lowers slowly. • The float & hold (third position) is the neutral position of the lever. When the damper body is lowered to its maximum extent, it functions as a "float," and otherwise, it functions as a "hold." • The raised position (fourth position) is the position where the lever is tilted backward, and while in this position, the dump body rises slowly. The raised detent (5th position) is the position where the lever is tilted backward until it clicks into place. When operated to this position, the dump body automatically rises to its maximum height. For example, the hoist control unit 60 is configured to have a set range of tilt in the front-rear direction, and to click when it is tilted to its maximum extent forward and to its maximum extent backward. When it is tilted to its maximum extent forward and clicks, the dump body automatically lowers to its maximum position. Also, when it is tilted forward at an angle that does not click, the dump body lowers slowly. On the other hand, when it is tilted to its maximum extent backward and clicks, the dump body automatically rises to its maximum position. Also, when it is tilted backward at an angle that does not click, the dump body rises slowly.

[0029] The hoist lever 60, which serves as the hoist operating unit 60, is a momentary lever and has the characteristic of automatically returning to its original position ("float & hold") after operation.

[0030] The hoist control unit 60 is configured to automatically increase engine speed when the dump body is raised or lowered. This eliminates the need to operate the accelerator when raising or lowering the dump body.

[0031] The distance between the shift lever 30 and the hoist lever 60 is approximately 55 mm when the shift lever 30 is in the R position, approximately 73 mm when the shift lever is in the N position, and approximately 92 mm when the shift lever 30 is in the D position. Here, the distance between the shift lever 30 and the hoist lever 60 refers to the length of the space formed between the shift lever 30 and the hoist lever 60.

[0032] (Wiper control unit 70) As shown in Figure 2, the cab 12 is equipped with a wiper operating section 70.

[0033] The wiper operating section 70 is provided so as to protrude from the steering column 28 in a predetermined protruding direction. The direction in which the wiper operating section 70 protrudes from the steering column 28 is one side (left side) in the width direction.

[0034] As shown in Figure 6, the wiper operating unit 70 includes a first rotating operating unit 71 configured to rotate around a rotation axis along the protruding direction, and a second rotating operating unit 72 located on the tip side in the protruding direction relative to the first rotating operating unit 71, configured to rotate around the same rotation axis as the rotation axis of the first rotating operating unit 71.

[0035] The first rotary operating section 71 functions as a switch to operate the rear wiper. The shape of the first rotary operating section 71 in a cross-section perpendicular to the axis of rotation is egg-shaped. The first rotary operating section 71 is positioned so that the narrower end of the egg shape faces forward in the vehicle's front-to-back direction. The first rotary operating section 71 is operated by pressing down or lifting the narrower end of the egg shape.

[0036] The second rotary operating section 72 functions as a switch for operating the front wipers. The second rotary operating section 72 has two protrusions 72A that are spaced apart in the circumferential direction. The two protrusions 72A are spaced 90 to 120 degrees apart in the circumferential direction around the axis of rotation. When the switch is off, one of the two protrusions 72A protrudes forward in the vehicle's longitudinal direction, and the other protrusion 72A protrudes upward.

[0037] <Effects and Effects> Next, the effects and advantages of this embodiment will be described.

[0038] This embodiment relates to a cab 12 of a construction machine. However, in a cab 12 of a construction machine, if the operation of switching the gear position between forward, neutral, and reverse, and the operation of changing the upper limit of the speed in forward, are performed by the same operating part (for example, a shift lever), the operation of that operating part may become complicated, making it difficult to perform precise operations. Therefore, in this embodiment, as shown in Figure 2, the cab 12 includes a first shift operation unit 30 and a second shift operation unit 50 provided separately from the first shift operation unit 30. The first shift operation unit 30 is configured to allow switching of the gear position between forward, neutral, and reverse. The second shift operation unit 50 is configured to allow changing the upper limit of the speed step in forward. Therefore, the operation of switching gear positions between forward, neutral, and reverse, and the operation of changing the upper limit of the forward speed range, can be performed using separate control units. As a result, the operation of each control unit can be simplified, and as a result, precise operation can be made easier.

[0039] Furthermore, in this embodiment, the first shift operation unit 30 is positioned at a distance from the steering column 28. As a result, the first shift operation unit 30 is positioned in a location where it cannot be operated without taking one's hands off the steering wheel 23. Therefore, compared to the case where the first shift operation unit is located in a position that allows operation without removing one's hand from the handle 23, the degree of freedom in the structure of the first shift operation unit 30 can be increased.

[0040] Furthermore, in this embodiment, the second shift operation unit 50 is provided on the steering column 28. This allows the second shift operation unit 50 to be operated without taking one's hands off the steering wheel 23. Therefore, it is easier to maintain steering control even when operating the second shift control unit 50.

[0041] Furthermore, in this embodiment, the first shift operation unit 30 is located on one side in the width direction of the cab 12 with respect to the center of the handle 23, and the second shift operation unit 50 is located on the other side in the width direction of the cab 12 with respect to the center of the handle 23. Therefore, since the first shift control unit 30 and the second shift control unit 50 can be operated with opposite hands, it is easy to operate the second shift control unit 50 immediately after operating the first shift control unit 30.

[0042] Furthermore, in this embodiment, the second shift operation unit 50 is configured to enable shift hold operation (see arrow C in Figure 4). Therefore, it becomes easier to maintain steering control even when performing a shift hold operation. Note that a shift hold operation refers to the operation of fixing the gear to a specific gear and the operation of releasing that fixation.

[0043] Furthermore, in this embodiment, as shown in Figure 5, there are a total of two speed settings in reverse. As shown in Figure 3, the first shift operation unit 30 has a switch button 33 that allows switching between reverse speed settings. Each time the switch button 33 is pressed, the reverse speed setting switches between reverse 1st gear and reverse 2nd gear. Therefore, when switching speed gears in reverse, it is not necessary to operate any other operating parts (for example, the second shift operating part 50) other than the first shift operating part 30. For example, after switching to the reverse gear position by operating the first shift operating part 30, the speed gear in reverse can be switched without moving the position of the hand. Also, since there are a total of two speed gears in reverse, the switching operation can be achieved with a simple switch button 33. Furthermore, since the second shift control unit 50 can also be used to switch the reverse speed gear, if you want to switch speed gears while driving in reverse, you can do so without taking your hands off the steering wheel 23.

[0044] Incidentally, when performing soil removal, the operator's hands need to operate the handle 23 to move to the soil disposal site, the first shift control unit 30 to stop, and the hoist control unit 60 to move the dump body. Therefore, the operator's hands move in the order of handle 23, first shift control unit 30, and hoist control unit 60. This hand movement is thought to contribute to operator fatigue. Therefore, in this embodiment, as shown in Figure 3, the hoist operation unit 60 is positioned in front of the first shift operation unit 30. The first shift operation unit 30 is configured to be operable with the palm of the hand, and the hoist operation unit 60 is configured to be operable with the fingers of the same hand. Specifically, the hoist operation unit 60 is configured to be operable with the fingers of the hand while the hand is placed on the first shift operation unit 30. Therefore, the amount of hand movement required when transitioning from operating the first shift control unit 30 to operating the hoist control unit 60 can be reduced. Specifically, by operating the first shift control unit 30 with the palm of the hand and the hoist control unit 60 with the fingers of the same hand, the amount of hand movement can be reduced.

[0045] By the way, with conventional construction machinery, if you want to maintain a stationary state after stopping the machinery, such as during soil removal or loading, it may be necessary to perform operations such as applying the retarder brake to its maximum extent or applying the parking brake. Therefore, in this embodiment, when the first shift operation unit 30 is used to change to the neutral gear position, the brake device is controlled so that the stationary state is maintained. Therefore, for example, when you want to stop a construction machine before removing soil, it becomes unnecessary to operate any operating parts other than the first shift operating unit 30 in order to maintain the stopped state.

[0046] Furthermore, in this embodiment, as shown in Figure 2, the cab 12 is provided with a wiper operating section 70 that protrudes from the steering column 28 in a predetermined protruding direction. As shown in Figure 6, the wiper operating section 70 includes a first rotating operating section 71 configured to be able to rotate around a rotation axis along the protruding direction, and a second rotating operating section 72 located on the tip side in the protruding direction relative to the first rotating operating section 71, configured to be able to rotate around the same rotation axis as the rotation axis of the first rotating operating section 71. Therefore, for example, the first rotary operation unit 71 can be used as a switch to operate either the front wiper or the rear wiper, and the second rotary operation unit 72 can be used as a switch to operate the other of the front wiper or the rear wiper.

[0047] By the way, with a wiper operating unit 70 configured in this way, it may be difficult to operate the first rotation operating unit 71 located towards the back, especially if the operator has small hands. Therefore, in this embodiment, as shown in Figure 6(B), the shape of the first rotating operation unit 71 in a cross-section perpendicular to the rotation axis is oval. Therefore, it is possible to press down on or lift the slender, egg-shaped tip of the first rotating control unit 71, thereby improving the operability of the first rotating control unit 71.

[0048] Incidentally, in control devices that select the upper limit of the gear by changing the position of a lever-type control, it can sometimes be difficult to accurately select the desired upper limit of the gear. This problem becomes particularly pronounced when the transmission has multiple gears. Therefore, in this embodiment, the second shift operation unit 50 is configured to enable operations that raise the speed step limit by a predetermined number of steps from the current speed step limit, and operations that lower the speed step limit by a predetermined number of steps from the current speed step limit (see arrows A and B in Figure 4). Therefore, this solves the problem of difficulty in setting the speed step limit to the desired speed step limit.

[0049] While preferred embodiments of the present disclosure have been described above, the present disclosure is not limited to those described above.

[0050] In the above embodiment, the first shift operation unit is a lever-type operation unit, but the first shift operation unit of this disclosure is not limited to this. The first shift operation unit may be, for example, a button type or a touch panel type.

[0051] In the above embodiment, the second shift operation unit is positioned to be operated with the hand opposite to the hand operating the first shift operation unit, but the disclosure is not limited thereto.

[0052] In the above embodiment, a hoist operating unit for operating the dump body is provided, and the hoist operating unit is located near the first shift operating unit, but the disclosure is not limited thereto.

[0053] In the above embodiment, the first shift operation unit is positioned so that it cannot be operated without taking one's hands off the steering wheel, but the disclosure is not limited thereto.

[0054] Although not described above, the first shift control unit is also configured to allow switching of the speed gear in reverse. However, the first shift control unit of this disclosure is not limited to this.

[0055] <Note> The following additional information is disclosed as a concept encompassing the configuration according to the above embodiment. (Additional note 1) The first shift operation unit is configured to allow switching between forward, neutral, and reverse gear positions, A second shift operation unit is configured to allow operation to change the upper limit of the speed gear in forward motion and to perform a shift hold operation, A cab for construction machinery equipped with this feature. (Additional note 2) The first shift operation unit is provided at a position spaced apart from the steering column. The second shift operation unit is provided on the steering column, The cab described in Appendix 1. (Additional note 3) The first shift operation unit is located on one side in the width direction of the cab with respect to the center of the handle, The second shift operation unit is located on the other side in the width direction of the cab with respect to the center of the handle, The cab described in Appendix 2. (Additional note 4) The number of speed settings in reverse is a total of 2. The first shift operation unit has a selector button that allows switching between speed gears in reverse, Each time the aforementioned switch button is pressed, the reverse gear switches between reverse 1st gear and reverse 2nd gear. A cab as specified in any one of the appendices 1 to 3. (Additional note 5) The first shift operation unit is equipped with a switch button that allows switching between starting speed stages in forward motion. When the aforementioned switch button is pressed, the starting speed setting for forward movement switches between an automatic setting and a specific setting. A cab as specified in any one of the appendices 1 to 4. (Additional note 6) The second shift operation unit is a lever-type operation unit provided on the steering column, By continuously pushing the second shift operation unit in one direction in the steering wheel rotation direction, the upper limit of the speed gear can be set to the maximum speed gear. By continuously pushing the second shift operation unit in the other direction of steering wheel rotation, the upper limit of the speed gear can be set to the current speed gear. A cab as specified in any one of the appendices 1 to 5. (Additional note 7) The aforementioned carburetor is, A hoist control unit configured to allow operation of the dump body. Equipped with, The hoist operating unit is positioned in front of the first shift operating unit. The first shift operation unit is configured to be operable with the palm of the hand, The hoist operating unit is configured to be operable with the fingers of the hand while the hand is placed on the first shift operating unit. A cab as specified in any one of the appendices 1 to 6. (Additional note 8) The distance between the first shift operation unit and the first shift operation unit is 60 to 85 mm when each is in the neutral position. The cab described in Appendix 7. (Additional note 9) When the gear position is changed to neutral using the first shift operation unit, the brake system is controlled to maintain the stationary state. A cab as specified in any one of the appendices 1 to 8. (Additional note 10) The cab is equipped with a wiper operating section that is provided to protrude from the steering column in a predetermined direction, The wiper operating unit is, A first rotational operation unit is configured to be able to rotate around a rotation axis along the aforementioned protruding direction, A second rotation operating part is located on the tip side in the protruding direction relative to the first rotation operating part, and is configured to be able to rotate around the same rotation axis as the rotation axis of the first rotation operating part. Equipped with, The shape of the first rotating operating section in a cross-section perpendicular to the rotation axis is oval. A cab as specified in any one of the appendices 1 to 9. (Additional note 11) The first rotating operating part is positioned such that the narrower, egg-shaped tip faces forward in the vehicle's longitudinal direction. The cab described in Appendix 10. (Additional note 12) The second rotational operating section has two protrusions that are spaced apart in the circumferential direction, With the switch off, one of the two protrusions protrudes forward in the vehicle's longitudinal direction, and the other protrusion protrudes upward. The cab described in Appendix 10 or Appendix 11. (Additional note 13) The two protrusions are separated by an angle of 90 to 120 degrees in the circumferential direction around the axis of rotation. The cab described in Appendix 12. (Additional note 14) A construction machine equipped with a cab as described in any one of the appendices 1 to 13. [Explanation of Symbols]

[0056] 12...Cab, 21...Operator's seat, 23...Steering wheel, 28...Steering column, 30...Shift lever (first shift operation part), 31...Grip part, 31A...Mounting surface, 32...Side button, 33...Selection button, 40...Cab shell, 50...Selector lever (second shift operation part), 60...Hoist lever (hoist operation part), 70...Wiper operation part, 71...First rotation operation part, 72...Second rotation operation part, 72A...Protrusion

Claims

1. The first shift operation unit is configured to allow switching between forward, neutral, and reverse gear positions, A second shift operation unit is configured to allow operation to change the upper limit of the speed gear in forward motion and to perform a shift hold operation, A cab for construction machinery equipped with this feature.

2. The first shift operation unit is provided at a position spaced apart from the steering column. The second shift operation unit is provided on the steering column, The carburetor according to claim 1.

3. The first shift operation unit is located on one side in the width direction of the cab with respect to the center of the handle, The second shift operation unit is located on the other side in the width direction of the cab with respect to the center of the handle, The carburetor according to claim 2.

4. There are a total of two speed settings in reverse. The first shift operation unit has a selector button that allows switching between speed gears in reverse, Each time the aforementioned switch button is pressed, the reverse speed gear switches between reverse 1st gear and reverse 2nd gear. The carburetor according to claim 1.

5. The first shift operation unit is equipped with a switch button that allows switching between starting speed stages in forward motion. When the aforementioned switch button is pressed, the starting speed setting for forward movement switches between an automatic setting and a specific setting. The carburetor according to claim 1.

6. The second shift operation unit is a lever-type operation unit provided on the steering column. By continuously pushing the second shift operation unit in one direction in the steering wheel rotation direction, the upper limit of the speed gear can be set to the maximum speed gear. By continuously pushing the second shift operation unit in the other direction of steering wheel rotation, the upper limit of the speed gear can be set to the current speed gear. The carburetor according to claim 1.

7. The aforementioned carburetor is, A hoist control unit configured to allow operation of the dump body. Equipped with, The hoist operating unit is positioned in front of the first shift operating unit. The first shift operation unit is configured to be operable with the palm of the hand, The hoist operating unit is configured to be operable with the fingers of the hand while the hand is placed on the first shift operating unit. The carburetor according to claim 1.

8. The distance between the first shift operation unit and the first shift operation unit is 60 to 85 mm when each is in the neutral position. The carburetor according to claim 7.

9. When the gear position is changed to neutral using the first shift operation unit, the brake system is controlled to maintain the stationary state. The carburetor according to claim 1.

10. The cab is equipped with a wiper operating section that is provided to protrude from the steering column in a predetermined direction, The wiper operating unit is, A first rotational operation unit is configured to be able to rotate around a rotation axis along the aforementioned protruding direction, A second rotation operating part is located on the tip side in the protruding direction relative to the first rotation operating part, and is configured to be able to rotate around the same rotation axis as the rotation axis of the first rotation operating part. Equipped with, The shape of the first rotating operating section in a cross-section perpendicular to the rotation axis is oval. The carburetor according to claim 1.

11. The first rotating operating part is positioned such that the narrower, egg-shaped tip faces forward in the vehicle's longitudinal direction. The cab according to claim 10.

12. The second rotational operating section has two protrusions that are spaced apart in the circumferential direction, With the switch off, one of the two protrusions protrudes forward in the vehicle's longitudinal direction, and the other protrusion protrudes upward. The cab according to claim 10.

13. The two protrusions are separated by an angle of 90 to 120 degrees in the circumferential direction around the axis of rotation. The carburetor according to claim 12.

14. A construction machine comprising the cab described in claim 1.

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