JPH08156663A - Driver's seat rotating device for working machine - Google Patents

Abstract

PURPOSE: To provide a driver's seat rotating device for a working machine that can rotate a driver's seat only when an operator really intends to rotate the driver's seat. CONSTITUTION: A rotary shaft 3a is vertically provided on the floor face 1 of a driver's cab, and a driver's seat 5 is fitted to this rotary shaft 3a. The rotary shaft 3a is provided with a drive unit (hydraulic motor) 3 and a braking device 6, and the braking device 6 is provided with a braking release device 7. The braking release device 7 is provided with a first switch 14 to be a first release operating element, a second switch 15 to be a second release operating element, and a third switch 16 to be a third release operating element. The braking release device 7 is so constituted that the release of the braking device and the start of the drive unit cannot be performed unless all of the first to third switches are operated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driver's seat rotating device for a working machine, and more particularly to the structure of a driver's seat rotating shaft braking device and its releasing device.

[0002]

2. Description of the Related Art For example, in a working machine such as a bulldozer, a hydraulic excavator, and a freight carrier, a driver's seat is fixed on a vehicle body or a revolving structure rotatably attached to the vehicle body. there were. In such a conventional work machine, when the direction of the vehicle body or the revolving structure and the direction of the part where the work is actually performed are different, the operator has his or her neck or body in order to secure a view in the working direction. I have no choice but to operate the work machine while twisting. For this reason, the work requires skill, not only the operator is extremely tired, but in some cases, the visibility of the work department cannot be ensured, so that the work may not be performed safely and efficiently. .

In order to improve such inconvenience, conventionally, for example, Japanese Utility Model Publication No. 56-87332 and Japanese Utility Model Publication No.
-87333, Japanese Utility Model Laid-Open No. 56-87334,
Japanese Utility Model Publication No. 56-87938, Japanese Utility Model Publication No. 57-1333.
No. 1, Japanese Utility Model Publication No. 63-26455, Japanese Unexamined Patent Publication No. 5-
As described in Japanese Patent No. 13205, etc., a work machine in which a driver's seat is rotatably attached to a vehicle body or a swing structure has been proposed. According to this work machine, the operator can always maintain a sufficient working field while maintaining a good working posture, so that the above-mentioned various inconveniences can be improved.

[0004]

However, in the work machine with a driver's seat rotating device known in the related art, while the driver's seat rotating device can be easily operated, another problem is that the driver's seat rotating device is erroneously operated. The problem arises. If the operator mistakenly operates while seated, the driver's seat will rotate carelessly, for example, parts of the body will come into contact with various devices and the like provided in the driver's cab, and work will be temporarily interrupted. It can happen.

The present invention has been made to solve the deficiencies of the prior art, and an object thereof is to provide a driver's seat rotating device for a working machine capable of rotating the driver's seat only when necessary. To do.

[0006]

In order to achieve the above-mentioned object, the present invention provides a rotary shaft arranged vertically to a floor surface of a driver's cab, and a driver's seat attached to the rotary shaft. In a driver's seat rotating device for a work machine including the drive device for the rotating shaft, a braking device is provided on the rotating shaft, and a braking release device for prohibiting activation of the driving device unless braking by the braking device is released. It is configured to include.

In order to further enhance safety, the braking releasing device is provided with at least two releasing operating devices, and the braking device is released only when the releasing operating devices are simultaneously operated, More preferably, the driver can rotate the driver's seat. In this case, it is preferable that each release operation device of the brake release device is set to a position where it cannot be operated simultaneously with one hand or one foot of the operator seated in the driver's seat. Even when the driver's seat rotates while being operated at the same time, it is more preferable that the device arranged in the driver's cab is arranged at a position where the operator seated in the driver's seat does not collide.

[0008]

If the drive device can be started even if the brake device is not released by the brake release device, the driver's seat is rotated by the drive device that has been started in advance as soon as the brake device is released. Can occur. With a structure that prohibits activation of the drive device unless the braking of the braking device is released by the release device, the driver's seat does not rotate as soon as the braking device is released, and the operator really intends to rotate the driver's seat. The drive device can be rotated only when the drive device is activated. Further, since the operator can sufficiently prepare the posture corresponding to the rotation of the driver's seat before starting the drive device, the driver's seat rotating device can be used more safely.

At least two braking release devices are provided.
When using a release device having only one release operation device, a device that releases the braking device only when the two or more release operation devices are operated at the same time and the driver can rotate the driver's seat is used. Compared with the above, the probability of erroneously operating the release operation device can be reduced, and the operator himself / herself can have a clear awareness of rotating the driver's seat, so that inconvenience due to careless rotation of the driver's seat can be prevented.

If the two or more release operating devices are set to positions that can be simultaneously operated with one hand or one leg of the operator sitting in the driver's seat, an erroneous operation is likely to occur, and the two or more release operating devices are likely to be operated. The prepared effect is weakened.
If two or more release operation devices are set in a position where they cannot be operated simultaneously with one hand or one foot of the operator sitting in the driver's seat, incorrect operation is unlikely to occur, and the effect of having two or more release operation devices is sufficient. Can be demonstrated.

Further, when the two or more releasing operation devices are set in positions where they cannot be operated unless the limbs are extended or the body is bent, the control device is released and the drive device is activated. In addition, the operator's body may come into contact with peripheral equipment. Even if the driver's seat rotates while the release operators are operated, the release operators should not be placed in a position where the operator, etc. in the driver's seat does not come into contact with the equipment etc. In this case, such inconvenience is unlikely to occur, and safety is further enhanced.

[0012]

【Example】

<First Embodiment> FIGS. 1 to 3 show a first example of a driver's seat rotating apparatus for a working machine according to the present invention. 1 is a configuration diagram of a driver's seat rotating device according to a first embodiment, FIG. 2 is a circuit diagram showing a hydraulic system and an electric system of the driver's seat rotating device, and FIG. 3 is a hydraulic excavator equipped with the driver's seat rotating device. FIG.

As is apparent from FIG. 1, the driver's seat rotating apparatus of this embodiment has a driver's seat setting table 2 provided on a floor surface 1 of a driver's cab.
A hydraulic motor 3 which is a drive device provided inside the driver's seat setting table 2, a hydraulic pump 4 which is a drive source of the hydraulic motor 3, and an operation which is attached to a rotary shaft 3a which is a main shaft of the hydraulic motor 3. Seat 5 and braking device 6 for the rotating shaft 3a
A release device 7 for the braking device 6, operating devices 8 and 9 for working machines provided on the left and right sides of the driver's seat 5, a footrest 10 suspended below the driver's seat 5, and the operation The hydraulic excavator operating levers 11 and 12 provided in each of the devices 8 and 9, the rotation operating lever 13 of the driver seat 5 provided in one operating device 8, and the other operating device 9 are provided. And a second switch 1 which is a second release operator and a third release operator which are respectively disposed on the left and right sides of the footrest 10.
5 and the third switch 16 are mainly included.

The hydraulic motor 3 and the hydraulic pump 4 are connected via a pipe a, and the rotary operation device 13 and the hydraulic motor 3 are connected via a signal line b. On the other hand, the first to third switches 14, 15, 16 and the brake release device 7 are connected via signal lines c, d, e, and the brake release device 7 and the hydraulic motor 3 are It is connected via a signal line f.

As shown in FIG. 3, the driver's seat rotating device is set in a driver's cab 23 provided on a revolving structure 22 of a hydraulic excavator 21. In the figure, reference numeral 24 is a front member pin-joined to the front portion of the revolving unit 22, reference numeral 25 is a swing cylinder that swings the front member 24 in the left-right direction, and reference numeral 26 is a traveling body such as a crawler.

As the hydraulic pump 4 which is a drive source of the hydraulic motor 3, a hydraulic pump dedicated to the hydraulic motor 3 can be provided, and a hydraulic pump which is a drive source of the revolving structure 22, the front member 24 and the traveling structure 26 can be used. It can also be used as a hydraulic pump mounted on a shovel. As shown in FIG. 2, the hydraulic pump 4 is driven by a prime mover 27 and supplies pressure oil to the hydraulic motor 3 via an electromagnetic valve 28 and a direction / flow rate switching valve 29. Solenoid valve 28
Is switched to the open state when the solenoid 28a is energized to enable the supply of pressure oil to the hydraulic motor 3. On the other hand, the direction / flow rate switching valve 29 is switched by the operator operating the operation lever 29a, supplies pressure oil in a direction corresponding to the switching direction by a flow rate according to the switching amount, and rotates the rotary shaft 3a. Move.

As shown in FIG. 2, the braking device 6 has a lever 6a whose one end is pin-connected to a fixed portion, a brake pad 6b attached to the lever 6a, and the brake pad 6b which is always attached to the rotary shaft 3a. The spring member 6c that urges in the pressing direction, and the lever 6a is rotated against the elastic force of the spring member 6c at the time of energization, and the brake pad 6b is rotated by the rotating shaft 3.
and a solenoid 6d separated from a.

The brake releasing device 7 is composed of the electric circuit shown in FIG. 2, and the first to third switches 14 to 16 provided in the brake releasing device 7 are of an automatic reset type as shown in FIG. It is composed of a normally open switch. These first to third switches 14 to 16 are connected in series to an electric circuit that constitutes the brake release device 7, together with a solenoid 28a included in the solenoid valve 28 and a solenoid 6d included in the braking device 6. Therefore, the first to third switches 14 to 1
When all 6 are operated, the solenoid 6d is energized, the lever 6a is rotated against the elastic force of the spring member 6c, the brake pad 6b is separated from the rotation shaft 3a, and the rotation shaft 3a is braked. It will be canceled. At the same time, the solenoid 28a is energized to switch the electromagnetic valve 28 to the open state, and the pressure oil can be supplied to the hydraulic motor 3 by switching the direction / flow rate switching valve 29, that is, the driver's seat 5 can be rotated. .

On the other hand, when the rotation of the driver's seat 5 is stopped, the direction / flow rate switching valve 29 is switched to the neutral position to cut off the supply of pressure oil to the hydraulic motor 3. As a result, the rotation of the driver's seat 5 is stopped. After that, when the limbs are released from the first to third switches 14 to 16, the first to third switches 14 to 16 made of the automatic reset type normally open switch are automatically switched to the off position, and the solenoid valve 28 is switched to the closed state. At the same time, the solenoid 6d is de-energized, the brake pad 6b is pressed against the rotating shaft 3a by the elastic force of the spring member 6c, and the driver's seat 5 is braked. After the driver's seat 5 is stopped, the brake pad 6b is continuously pressed against the rotary shaft 3a to lock the driver's seat 5.

In the driver's seat rotating apparatus of the working machine of this example, a solenoid valve 28 is provided in the pipe a connecting the hydraulic pump 4 and the direction / flow rate switching valve 29, and the solenoid valve 28 is divided into the first to third sections. Since the switches 14 to 16 are connected in series, the hydraulic motor 3 does not start unless the first to third switches 14 to 16 are simultaneously operated and then the direction / flow rate switching valve 29 is operated. Therefore, it becomes possible to rotate the driver's seat 5 only after the operator really intends to rotate the driver's seat 5 and operates the first to third switches 14 to 16. Further, since the operator can sufficiently prepare the posture corresponding to the rotation of the driver's seat before the driver's seat 5 is rotated, the safety is further enhanced.

Further, in the driver's seat rotating device of the working machine of this example, the releasing device 7 of the braking device 6 is provided with the first to third switches 14 to 16 which are normally-open switches of the automatic return type and the solenoid valve 2.
Since the solenoid 28a included in 8 and the solenoid 6d included in the braking device 6 are configured by an electric circuit connected in series, the braking device 6 operates only when the three switches 14 to 16 are simultaneously operated. It will be canceled. Therefore, as compared with the case where the release device having only one release operation device is used, the probability that the release operation device is erroneously operated is low, and it is possible to clearly have the awareness that the operator himself rotates the driver's seat. The inconvenience caused by careless rotation of the driver's seat can be prevented.

Further, the first switch 14 is provided on the operating device 8 provided on one side of the driver's seat 5, and the second and third switches 15 and 16 are provided on the footrest 1.
Since they are arranged on both the left and right sides through 0,
It is physically impossible to simultaneously operate the third switch with one hand or one foot of the operator sitting in the driver's seat. Therefore, erroneous operation of the brake release device 7 is unlikely to occur, and safety is excellent. Further, as described above, since the first to third switches 14 to 16 are arranged around the driver's seat 5, the operator does not need to extend his or her limbs or bend his body. 14 to 16 can be operated. Therefore, when the driver's seat 5 rotates, the operator's body rarely touches peripheral devices and the like, which is also excellent in safety.

<Second Embodiment> Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a configuration diagram of a driver's seat rotating device according to the second embodiment, and FIG. 5 is a circuit diagram showing a hydraulic system and an electric system of the driver's seat rotating device. In these figures, reference numeral 31 is a controller with a built-in computer, reference numeral 32 is an automatic operation changeover switch, and the other portions corresponding to those in FIG. 1 have the same reference numerals.

As is apparent from these figures, the driver's seat rotating device of this example performs the operation of operating the working machine and the operation of rotating the driver's seat by the controller 31 having a built-in computer, and automatically by the controller 31. The operation changeover switch 32 is provided, and the driver's seat 5 is interlocked in accordance with expansion and contraction of the swing cylinder 25, or the swing cylinder 25
It is characterized in that the driver's seat 5 can be operated regardless of expansion and contraction of the vehicle.

That is, in the driver's seat rotating device of this example, the levers 11 and 12 for operating the hydraulic excavator provided in the operating devices 8 and 9 are connected to the controller 31 via the signal lines g and h to operate. Lever 13 for rotating operation of seat 5
Are connected to the controller 31 via the signal line i, and further the first to third switches 14 to 16 are connected to the controller 31 via the signal lines j, k and l.

The controller 31 determines whether or not the first to third switches 14 to 16 are operated, and when all the switches 14 to 16 are operated,
The braking release device 7 is released. Then, when the automatic operation changeover switch 32 is switched to the automatic operation, the amount of pressure oil supplied to the swing cylinder 25 or the like is calculated from the operation amount signal and the operation direction signal of the levers 11 and 12, and the calculated data is calculated. The swing cylinder 25 and the like are operated based on the above, and the optimum rotation amount and rotation direction of the driver's seat 5 are calculated from the operation amount signal and the operation direction signal of the swing cylinder operating lever 11, and the driver's seat is calculated based on the calculated data. Rotate 5. After the driver's seat is stopped, the operator switches 14 to 1
When any of the switches 6 is switched off, the controller 31 sends a signal to the braking device 6 to keep the driver's seat 5 in the braking state.

On the other hand, when the automatic operation changeover switch 32 is switched to the manual operation, the controller 31
The amount of pressure oil supplied to the swing cylinder 25 or the like is calculated from the operation amount signal and the operation direction signal of the levers 11 and 12, and the swing cylinder 25 or the like is operated based on the calculated data. At this stage, the rotation operation of the driver's seat 5 is not performed.
Next, when the operator operates all the switches 14 to 16 and operates the lever 13 for rotating the driver's seat,
The controller 31 calculates the optimum rotation amount and rotation direction of the driver's seat 5 from the operation amount signal and the operation direction signal, and rotates the driver seat 5 based on the calculated data. Also in this case, after the driver's seat is stopped, the operator operates the switches 14 to 16
When any of the above is switched off, the controller 31 sends a signal to the braking device 6 to hold the driver seat 5 in the braking state.

The driver's seat rotating device of this embodiment has the same effect as the driver's seat rotating device of the first embodiment, and the controller 31 having a built-in computer is used to brake the driver's seat 5, so that the calculation is performed. By appropriately selecting the factor, it is possible to smoothly start and stop the driver's seat 5 and further reduce operator fatigue.

<Third Embodiment> Next, a third embodiment of the present invention will be described with reference to FIGS. 6 and 7. FIG. 6 is a configuration diagram of a braking device and a brake releasing device provided in the driver seat rotation device of the present example, and FIG. 7 is a plan view of a hydraulic excavator in which the driver seat rotation device of the present example is mounted.

As shown in FIG. 7, the driver's seat rotating apparatus of this embodiment includes a rotary shaft 40 for holding the driver's seat 5 vertically to the floor 1 of the operator's cab and a front member 24 of the hydraulic excavator 21 for the operator's cab. Swing cylinder 25 that swings left and right with respect to
Are connected via an interlocking cable 41, and the driver's seat 5 is rotated in association with the extension and contraction of the swing cylinder 25. That is, when the swing pedal 42 provided on the floor surface 1 of the driver's cab is stepped forward, for example, the swing cylinder 25 extends and the front member 24 moves toward the arrow A.
, And the driver's seat 5 rotates in a clockwise direction accordingly to ensure a good view of the working unit. Conversely,
When the swing pedal 42 is stepped backward, for example, the swing cylinder 25 contracts and the front member 24 translates in the direction of the arrow B, and the driver's seat 5 rotates counterclockwise accordingly, and the working section becomes excellent. Secure visibility.

As shown in FIG. 6, the driver's seat rotating device of this embodiment includes a brake releasing pull cable 43 for releasing the braking of the braking device 6, a lock device 44 for the swing pedal 42, and
A lock device releasing pull cable 45 for releasing the lock device 44, a first lever 46 as a first release operator for operating each of the pull cables 43, 45, and the first
Mechanism 47 that controls the operation of the lever 46, a second lever 48 that is a second release operation device that operates the link mechanism 47, and a return spring that constantly urges the second lever 48 in a fixed direction. A braking release device consisting of 49 is provided.

The braking device 6 is the same as that provided in the driver's seat rotating device according to the first embodiment, and has a lever 6a whose one end is pin-connected to the fixed portion, and which is attached to the lever 6a. It comprises a brake pad 6b and a spring member 6c for constantly urging the brake pad 6b in the direction of pressing it against the rotating shaft 40.

The lock device 44 is provided with a support plate 44a standing on the floor surface 1 of the cab adjacent to the swing pedal 42,
The support plate 44a includes an engagement pin 44b that is held through the support plate 44a, and a return spring 44c that constantly urges the engagement pin 44b in a direction to engage the swing pedal 32.

The first lever 46 has a so-called bell crank, and its bent portion is rotatably connected to a fulcrum 50. At least one side of the first lever 46 is arranged at a position where an operator in the driver's cab can operate it while sitting in the driver's seat 5. On the other hand, this first
The other ends of the brake releasing pull cable 43 and the locking device releasing pull cable 45 are connected to the other side of the lever 46.

The link mechanism 47 includes a fulcrum 47a and a first link 4 having one end rotatably connected to the fulcrum 47a.
7b and a second link 47c whose middle portion is rotatably connected to the first link 47b.

The second lever 47 has a so-called bell crank, and its bent portion is rotatably connected to the fulcrum 51. At least one side of the second lever 47 is arranged at a position where an operator in the driver's cab can operate it while sitting in the driver's seat 5. On the other hand, this second
One end of the second link 47c is rotatably connected to the other side of the lever 47. A return spring 49 for constantly biasing the second lever 47 in a fixed direction is provided on the other side.

The operation of the driver's seat rotating device according to this embodiment will be described below. First, when the second lever 47 is lifted upward against the elastic force of the return spring 49, the second link 47c forming the link mechanism 47 is moved in accordance with the arrow C.
, The second link 47c and the first lever 46 are released from contact with each other, and the first lever 46 becomes rotatable. Then, when the first lever 46 is lifted upward, the brake release pull cable 43 and the lock device release pull cable 45 are pulled, the brake pad 6b is separated from the rotating shaft 40, and the brake device 6 is released. The engaging pin 44b of the lock device 44 is pulled in the direction of the arrow D to separate from the swing cylinder 25, and the lock device 44 is released. Therefore, if the swing pedal 42 is stepped forward or backward while maintaining this state,
Pressure oil flows from a pressure oil source (not shown) to the swing cylinder 25, and the swing cylinder 25 expands or contracts. Along with that, the driving force is transmitted to the rotary shaft 40 via the interlocking cable 41, and the driver's seat 5 rotates in a predetermined direction by a predetermined rotation amount.

After the rotation is stopped, when the first lever 46 and the second lever 47 are released, the elastic force of the return spring 49 causes
The first lever 46 and the second lever 47 are returned to their original positions, the brake release pull cable 43 and the lock device release pull cable 45 are pushed in, and the brake pad 6b is pressed against the rotating shaft 40 to make the brake device. 6 returns to the braking state, and the engaging pin 44b of the lock device 44
Is engaged with the swing pedal 42, and the swing pedal 42
Becomes inoperable. Therefore, it is possible to perform work safely while always ensuring a good field of view.

<Fourth Embodiment> Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 8 is a main part configuration diagram of a brake release device provided in the driver seat rotation device of the present example.

As shown in FIG. 8, the driver's seat rotation device of this embodiment includes a brake releasing pull cable 43 for releasing the braking of the braking device 6 and a lock device releasing pull cable for releasing the swing pedal locking device. 45, a lever 52 as a first release operator for operating the pull cables 43, 45, a lever control pull cable 53 as a second release operator for controlling the operation of the lever 52, and the lever From a push rod 54 provided at the tip of the control pull cable 53, a support base 55 that slidably holds the push rod 54, and a return spring 56 that constantly biases the push rod 54 in a fixed direction. A braking release device is provided. The other part of the configuration is the same as that of the driver's seat rotating device of the second embodiment, and therefore its illustration is omitted.

The tip end of the brake releasing pull cable 43 is connected to the lever 6a constituting the braking device 6, and the lock device releasing pull cable 45 is connected to the engaging pin 44b engaging with the swing pedal 42 ( (See FIG. 6).

The lever 52 has a so-called bell crank, and its bent portion is rotatably connected to a fulcrum 57. At least one side of the lever 52 is arranged at a position where an operator in the driver's cab can operate it while sitting on the driver's seat 5. Further, the lever control pull cable 53 is also arranged such that one end of the lever control pull cable 53 can be operated by an operator in the driver's seat while sitting on the driver's seat 5.

The operation of the driver's seat rotating device according to this embodiment will be described below. First, when the lever control pull cable 53 is lifted upward against the elastic force of the return spring 56,
Accordingly, the push rod 54 moves to the right in the figure, the contact between the push rod 54 and the lever 52 is released, and the lever 52 becomes rotatable. Then, when the lever 52 is lifted upward, the brake release pull cable 43 and the lock device release pull cable 45 are pulled, the brake pad 6b is separated from the rotating shaft 40, and the brake device 6 is released, and the lock device is released. The engaging pin 44b of 44 is pulled in the direction of the arrow D to swing cylinder 2
5, the lock device 44 is released. Therefore, when the swing pedal 42 is stepped forward or backward while maintaining this state, pressure oil flows from the pressure oil source (not shown) to the swing cylinder 25, and the swing cylinder 25 expands or contracts. Along with that, the driving force is transmitted to the rotary shaft 40 via the interlocking cable 41, and the driver's seat 5 rotates in a predetermined direction by a predetermined rotation amount.

After the rotation is stopped, when the lever 52 and the lever control pull cable 53 are separated, the elastic force of the return spring 56 causes the lever 52 and the lever control pull cable 53 to return to their original positions, and the brake release pull cable is returned. 43 and the lock device releasing pull cable 45 are pushed in, the brake pad 6b is pressed against the rotating shaft 40 to return the braking device 6 to the braking state, and the engagement pin 44b of the locking device 44 engages with the swing pedal 42. Then, the swing pedal 42 becomes inoperable. Therefore, it is possible to perform work safely while always ensuring a good field of view.

<Fifth Embodiment> Next, a fifth embodiment of the present invention will be described with reference to FIGS. 9 and 10. FIG. 9 is a cross-sectional view of the brake releasing device provided in the driver's seat rotating device of the present example as seen from the front side, and FIG. 10 is a side view of the brake releasing device.

The driver's seat rotating device of this embodiment has the configuration shown in FIGS.
As shown in 0, a rod 61, a support plate 62 that slidably supports the rod 61 in the rotational direction and the axial direction, and a return spring 63 that constantly urges the rod 61 in a constant direction.
And a first lever 64 attached to the support plate 62.
And a lever operating pull cable 65 which is a first release operating device connected to the first lever 64, and the rod 61.
A second lever 67, which is a second release operating device connected to the second lever 67 via a snap pin 66, a key 68 attached to the second lever 67, and a key groove 69 capable of engaging the key 68. The formed cable operating lever 70, the brake releasing pull cable 43 and the locking device releasing pull cable 45, one ends of which are connected to the cable operating lever 70.
And a braking release device consisting of The other part of the configuration is the same as that of the driver's seat rotating device of the second embodiment, and therefore its illustration is omitted.

The tip of the brake releasing pull cable 43 is connected to the lever 6a which constitutes the braking device 6, and the lock device releasing pull cable 45 is connected to the engaging pin 34b which engages with the swing pedal 32 ( (See FIG. 6).

The first lever 64 has a so-called bell crank, and its bent portion is rotatably connected to the support plate 62. The tip portion of the first lever 64 is in contact with the end surface of the rod 61. The operation end of the lever operation pull cable 65, which is the first release operation device, is arranged at a position where the operator in the operator's cab can operate it while sitting in the driver's seat 5. Further, the second lever 67, which is the second release operation device, is also arranged at a position where at least the operation portion thereof can be operated by the operator in the driver's seat while sitting on the driver's seat 5. The cable operating lever 70 is a rod 6
It is slidably attached to 1.

The operation of the driver's seat rotating device according to this embodiment will be described below. First, when the lever operating pull cable 65 is pulled against the elastic force of the return spring 63, the first lever 64 rotates counterclockwise accordingly, and the rod 61 resists the elastic force of the return spring 63. Moving to the left, the key 68 is inserted into the key groove 69 of the cable operating lever 70. At the same time, the engagement between the first lever 64 and the second lever 67 is released, and the second lever 67 becomes operable. Therefore, when the second lever 67 is operated, the rod 61, the second lever 67, the key 68, and the cable operating lever 70 rotate together, and the brake releasing pull cable 43 and the lock device releasing pull are pulled. The cable 45 is pulled, the brake pad 6b is separated from the rotary shaft 40, and the braking device 6 is released. At the same time, the engagement pin 44b of the locking device 44 is pulled in the direction of the arrow D and separated from the swing cylinder 25, and the lock is performed. The device 44 is released. Therefore,
When the swing pedal 42 is stepped forward or backward while maintaining this state, pressure oil flows from the pressure oil source (not shown) to the swing cylinder 25, and the swing cylinder 25 expands or contracts. Along with that, the driving force is transmitted to the rotary shaft 40 via the interlocking cable 41, and the driver's seat 5 rotates in a predetermined direction by a predetermined rotation amount.

After the rotation is stopped, the lever operating pull cable 6
When the fifth lever and the second lever 67 are released, the elastic force of the return spring 63 causes the lever operating pull cable 65 and the second lever 67 to return to their original positions, and the braking release pull cable 43 and the lock device releasing The pull cable 45 is pushed in, the brake pad 6b is pressed against the rotary shaft 40, the braking device 6 returns to the braking state, and the engagement pin 44b of the locking device 44 engages with the swing pedal 42, so that the swing pedal 42 is engaged. Becomes inoperable. Therefore, it is possible to perform work safely while always ensuring a good field of view.

In each of the above embodiments, the hydraulic motor was used as the drive source for the driver's seat, but instead of this,
Other actuators such as hydraulic cylinders or transmission motors can also be used.

In the above embodiment, the case where the hydraulic excavator having the swing type front member is mounted has been described as an example, but it goes without saying that it can be applied to any other working machine.

[0053]

As described above, the invention according to claim 1 has a structure in which the activation of the drive device is prohibited unless the braking of the braking device is released by the braking release device.
The operator's seat can be rotated only when the operator really intends. Furthermore, the driver's seat does not rotate as soon as the braking device is released, and the operator can fully prepare the posture corresponding to the rotation of the driver's seat before starting the drive device. The device can be used more safely.

According to the second aspect of the present invention, as the braking release device, the braking device is released only when at least two release operation devices are simultaneously operated, and the driver can rotate the driver's seat. I used the release operation device.
Compared to the case of using a release device that has only one, the probability of operating the release operation device by mistake can be reduced and the operator himself can have a clear awareness that he will rotate the driver's seat. It is possible to prevent the occurrence of inconveniences caused by excessive rotation.

According to the third aspect of the present invention, since the two or more releasing operation devices are set at positions that cannot be simultaneously operated with one hand or one foot of the operator sitting in the driver's seat, it is difficult to cause an erroneous operation. The effect provided with one or more releasing operation devices can be sufficiently exerted.

According to the fourth aspect of the present invention, the release operation devices are arranged in the operator's cab by the operator seated in the driver's seat even when the driver's seat is rotated while the release operation devices are operated. Since it is placed in a position where equipment does not touch,
The contact between the operator and the equipment arranged in the driver's cab is prevented, which further enhances safety.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a driver's seat rotation device according to a first embodiment.

FIG. 2 is a circuit diagram showing a hydraulic system and an electric system of a driver's seat rotation device according to the first embodiment.

FIG. 3 is a plan view of a hydraulic excavator on which the driver's seat rotation device according to the first embodiment is mounted.

FIG. 4 is a configuration diagram of a driver's seat rotation device according to a second embodiment.

FIG. 5 is a circuit diagram showing a hydraulic system and an electrical system of a driver's seat rotation device according to a second embodiment.

FIG. 6 is a configuration diagram of a driver's seat rotation device according to a third embodiment.

FIG. 7 is a plan view of a hydraulic excavator equipped with a driver's seat rotation device according to a third embodiment.

FIG. 8 is a configuration diagram of a brake release device provided in a driver seat rotation device according to a fourth embodiment.

FIG. 9 is a cross-sectional view of a brake release device provided in a driver seat rotation device according to a fifth embodiment as seen from the front direction.

FIG. 10 is a side view of a brake release device provided in a driver seat rotation device according to a fifth embodiment.

[Explanation of symbols]

 3 Drive Device (Hydraulic Motor) 3a Rotating Shaft 5 Driver's Seat 6 Braking Device 13 Driver's Rotation Operating Lever 14 First Release Device (First Switch) 15 Second Release Device (Second Switch) 16th Release device 3 (3rd switch)

Claims (4)

[Claims] 1. A driver's seat rotation of a working machine comprising a rotary shaft arranged perpendicular to a floor surface of a driver's cab, a driver's seat attached to the rotary shaft, and a drive device for the rotary shaft. A device for rotating a driver's seat of a work machine, comprising: a braking device provided on the rotating shaft, and a braking release device for prohibiting activation of the drive device unless braking by the braking device is released. 2. The driver's seat rotation device for a work machine according to claim 1, wherein the braking release device has at least two release operation devices, and when the release operation devices are operated at the same time. A driver's seat rotating device for a working machine, characterized in that only the braking device is released so that the driver can rotate the driver's seat. 3. The driver's seat rotating device for a work machine according to claim 2, wherein the two or more releasing operation devices are respectively set at positions that cannot be simultaneously operated with one hand or one foot of an operator seated in the driver's seat. The rotating device for the driver's seat of the work machine. 4. The driver's seat rotating device for a work machine according to claim 2, wherein even when the driver's seat rotates while the two or more release operators are simultaneously operated,
A driver's seat rotating apparatus for a working machine, wherein a device arranged in the operator's cab is arranged at a position where an operator seated in the driver's seat does not collide with the operator.