JP5847624B2 - Turning work vehicle - Google Patents

Description

  The present invention relates to a technology of a safety lever arranged at a boarding / alighting opening of a control unit of a turning work vehicle.

  Conventionally, an operation lever for working or traveling is arranged in the vicinity of a driver's seat in a steering part of a turning work vehicle such as a backhoe or a crane, and a safety lever (or a lock lever) is provided at an entrance of the steering part. ing. The safety lever is a lever for locking so as not to malfunction even if the operator touches the operation lever when getting on and off. With the safety lever facing up and down, the entrance / exit is in a position where the operator can pass, and the operation lever is locked so that it cannot be operated, the operator is seated on the driver's seat, and the safety lever is horizontally or diagonally In a state where the entrance / exit is closed toward the position where the operator is turned to a position where the operator cannot get on / off (pass), the operation lever is unlocked and the technology is configured to be operable. For example, it is the technique of patent document 1. FIG.

Japanese Utility Model Publication No. 61-10373

  However, the safety lever in Patent Document 1 can lock the work operation lever for operating the work machine and turning the work machine, but cannot lock the travel operation lever.

  The present invention has been made in view of the situation as described above, and allows a work operation lever disposed on both sides of a driver's seat and a traveling operation lever disposed in front of the driver's seat to be simultaneously locked or released, thereby ensuring safety. Provided is a turning work vehicle that improves the operability of the lever and can reliably prevent the operator from boarding from the entrance when unlocking the safety lever.

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.
That is, according to the first aspect, a work operation lever that is disposed on both the left and right sides of the driver's seat and can operate the work machine, and a travel operation lever that is disposed in front of the driver's seat and can be operated in the forward / rearward direction are disposed. The work operation lever and the travel operation lever can be locked or released at the same time by operating a safety lever, and the safety lever is disposed in the vicinity of the entrance / exit and when unlocked. The entrance / exit is blocked by the safety lever, and the foot operating means of the safety lever is arranged in the vicinity of the rotation base of the safety lever.

According to a second aspect of the present invention, the safety lever protrudes upward from the floor, and a shutoff that blocks a pilot oil passage that is switched by an operation of the work operation lever is provided at a rotating base portion of the safety lever located below the floor. A lock switch for operating the valve and a restricting means for restricting the rotation of the traveling operation lever are arranged.
According to a third aspect of the present invention, a work operation lever that is disposed on both the left and right sides of the driver's seat and can operate the work implement, and a travel operation lever that is disposed in front of the driver's seat and can be operated in the forward / reverse direction are disposed. A turning work vehicle, wherein the work operation lever and the travel operation lever can be simultaneously locked or released by operating a safety lever, and the safety lever is disposed in the vicinity of the entrance / exit, and is safety when unlocked. The entrance / exit is blocked by a lever , the safety lever protrudes upward from the floor, and the pilot oil passage that is switched by the operation of the work operation lever is blocked at the rotating base of the safety lever located below the floor A lock switch for operating the shut-off valve to be operated and a restricting means for restricting the rotation of the traveling operation lever are arranged.

As effects of the present invention, the following effects can be obtained.
That is, according to the first aspect, the work operation lever and the travel operation lever can be simultaneously locked or released by the safety lever, and the operability is improved. In addition, when the safety lever is unlocked, the entrance / exit is blocked by the safety lever, and it is possible to reliably prevent the operator from boarding at the entrance / exit.
In addition , by providing foot operation means, the safety lever can be easily operated with the foot while sitting in the driver's seat, and it is necessary to operate with the bend forward or with the hand away from the work operation lever. And operability is improved.
According to claim 2 , in addition to the effect of claim 1, the lock switch for operating the shutoff valve of the pilot oil passage and the restricting means for restricting the rotation of the travel operation lever are arranged in a concentrated manner below the floor. Therefore, it is not exposed on the floor, does not interfere with the operation means, does not obstruct traffic, and can be easily maintained.
Moreover, since it is not the structure which connects a safety lever and a work operation lever via a wire, a link, etc., an operation load does not increase and operativity is not deteriorated.
According to the third aspect, the operation lever and the traveling operation lever can be simultaneously locked or released by the safety lever, and the operability is improved. In addition, when the safety lever is unlocked, the entrance / exit is blocked by the safety lever, so that it is possible to reliably prevent the operator from boarding at the entrance / exit, and a lock switch that operates the pilot oil passage shut-off valve, as well as travel operation The control means that restricts the rotation of the lever can be concentrated on the bottom of the floor, so that it is not exposed on the floor, does not interfere with the operation means, does not obstruct traffic, and is easy to maintain. Can be.

The side view which showed the whole structure of the turning working vehicle which concerns on embodiment of this invention. The top view of a control part. The side view of a control part. The top view of a safety lever and a travel control lever. The side view of the rotation base part of a safety lever. The lower perspective view of a safety lever and a travel control lever. Hydraulic circuit diagram. The perspective view which shows the other Example of a safety lever. (A) is a bar-shaped embodiment, and (b) is a plate-shaped embodiment.

  First, a schematic configuration of a backhoe as a turning work vehicle will be described with reference to FIGS. 1 and 2. In addition, the arrow A direction in FIG. 1 is demonstrated as the front. In the backhoe 1, a revolving unit 3 is provided on a traveling device 2 so that the revolving unit 3 can freely rotate.

  The traveling device 2 is supported by a track frame 21 serving as a lower frame, and a driving wheel 22 and a front driven wheel 23 are disposed on the rear side of a support frame portion that is long on the left and right sides of the track frame 21 in the front-rear direction. A crawler belt 24 is wound around the driving wheel 22 and the driven wheel 23. The left and right drive wheels 22 and 22 are driven by hydraulic motors 25L and 25R (FIG. 7), respectively. A swing frame 31 constituting the swing body 3 is supported on the center of the track frame 21 via a swing bearing so as to be swingable. The turning frame 31 is turned by driving a turning motor 19 described later.

  The working machine 4 is attached to the front portion of the revolving frame 31. The work machine 4 includes a boom 12, a boom cylinder 13, an arm 14, an arm cylinder 15, a bucket 16, a bucket cylinder 17, and the like. The base portion of the boom 12 is supported by a protruding portion 31a formed by protruding forward from the front portion of the revolving frame 31 so as to be able to turn back and forth.

  The boom 12 is formed in a “<” shape when viewed from the side, and a rear lower part is supported by the projecting part 31 a so as to be able to rotate back and forth, and a cylinder rod tip of the boom cylinder 13 is supported by a lower part of the middle part. The boom 12 can be rotated back and forth by expanding and contracting. The base of the arm 14 and the tip of the arm cylinder 15 are pivotally supported at the tip of the boom 12, and the base of the arm cylinder 15 is supported on the middle part of the boom 12. The arm 14 can be rotated back and forth by extending and contracting the arm cylinder 15. A bucket 16 is supported at the tip of the arm 14, a bucket cylinder 17 is interposed between the bucket 16 and the base side of the arm 14, and the bucket 16 can be extended and retracted by extending and retracting the bucket cylinder 17.

  The revolving unit 3 is supported so as to be able to turn on the traveling device 2, the work machine 4 is mounted on the front part of the turning frame 31, the engine 5 is placed on the rear part of the turning frame 31, and the counterweight 6 is placed on the rear part. The steering unit 40, the hydraulic device, the turning motor 19, the hydraulic control unit, and the like are disposed on the turning frame 31.

  The counterweight 6 is disposed at the rear portion of the revolving frame 31 on the opposite side in order to balance the weight with the work machine 4 provided at the front end of the revolving frame 31. An engine 5 and a hydraulic pump 26 are disposed in front of the counterweight 6 on the turning frame 31. The hydraulic pump 26 is connected to and driven by the output shaft of the engine 5. A hydraulic oil tank is disposed on the left front side of the engine 5, and a fuel tank is disposed on the right front side of the engine 5.

  The control unit 40 is disposed on the left front portion of the turning frame 31. The control unit 40 includes a driver's seat 33, work operation levers 34L and 34R, travel operation levers 35L and 35R, an accelerator pedal, a safety lever 50, and the like. It is set as the structure covered with. A driver's seat 33 is disposed on the rear portion from a substantially central portion of the floor 32 in the cabin 36, work operation levers 34 </ b> L and 34 </ b> R for operating the work implement 4 are disposed on both the left and right sides of the driver seat 33, and the front of the driver seat 33. The traveling operation levers 35L and 35R, the traveling operation pedal, and the like are disposed on the floor 32. A door 36a is arranged at the left front portion of the cabin 36, and an opening portion in a state where the door 36a is opened is used as an entrance 41 for an operator to get on and off.

The hydraulic circuit will be described with reference to FIG.
The drive shafts of the hydraulic pump 26 and the pilot hydraulic pump 77 are connected to the output shaft of the engine 5 and driven. The discharge port of the hydraulic pump 26 is connected to the control valve 70 through a pipe. The control valve 70 includes a swing control valve 71, an arm control valve 72, a boom control valve 73, a bucket control valve 74, and travel control valves 75L and 75R. The swing control valve 71, the arm control valve 72, the boom control valve 73, and the bucket control valve 74 are each configured by a pilot-operated switching valve, and the travel control valves 75L and 75R are configured by a manually operated switching valve. .

  The turning control valve 71 is switched by operating the work operation lever 34L, and the turning motor 19 is rotated forward or backward to turn the turning body 3 left and right. A swing hydraulic motor 19 is connected to the secondary side of the swing control valve 71 via a hydraulic pipe. The arm control valve 72 is switched by operating the work operation lever 34L to extend or contract the arm cylinder 15 and rotate the arm 14 back and forth. The arm cylinder 15 is connected to the secondary side of the arm control valve 72.

  The boom control valve 73 is switched by operating the work operation lever 34R to extend or contract the boom cylinder 13 and rotate the boom 12 back and forth. The boom cylinder 13 is connected to the secondary side of the boom control valve 73. The bucket control valve 74 is switched by operating the work operation lever 34R, and extends or contracts the bucket cylinder 17 and rotates the bucket 16 back and forth. A bucket cylinder 17 is connected to the secondary side of the bucket control valve 74.

  The travel control valves 75L and 75R are switched by operating the travel operation levers 35L and 35R, and the drive wheels 22 and 22 fixed to the output shafts of the travel motors 25L and 25R are rotated forward or backward to rotate the travel device 2. Move forward or backward or turn. Travel motors 25L and 25R are connected to the secondary sides of the travel control valves 75L and 75R, respectively.

  A pilot port for switching the swing control valve 71 and the arm control valve 72 is connected to the pilot valve 37 via a pilot oil passage, and a pilot port for switching the boom control valve 73 and the bucket control valve 74 is a pilot valve 38 via the pilot oil passage. Connected.

  The pilot valve 37 is switched by sliding the spool by operating the work operation lever 34 </ b> L, and the pilot hydraulic pressure is switched to the pilot port of the swing control valve 71 or the arm control valve 72. The pilot valve 38 is switched by sliding the spool by operating the work operation lever 34R, and the pilot hydraulic pressure is switched to the pilot port of the boom control valve 73 or the bucket control valve 74 by sending oil.

  The primary side (pump port side) of the pilot valves 37 and 38 is connected to the discharge side of the pilot hydraulic pump 77 via a shut-off valve 76. The shut-off valve 76 is a valve for switching the pressure oil from the pilot hydraulic pump 77 to the pilot valves 37 and 38, or switching to unload (drain), so that the pressure oil is not sent to the pilot valves 37 and 38. By switching to, the turning control valve 71, the arm control valve 72, the boom control valve 73, and the bucket control valve 74 are prevented from being switched even when the work operation levers 34L and 34R are operated. The shut-off valve 76 is composed of an electromagnetic valve. The solenoid 76a of the shut-off valve 76 is connected to the lock switch 56, and the shut-off valve 76 is switched by turning on / off the lock switch 56.

  The lock switch 56 is turned on by turning a safety lever 50, which will be described later, to a release position, supplying electric power to the solenoid 76a, and switching the shut-off valve 76 so that pressure oil can be supplied to the pilot valves 37 and 38. When the safety lever 50 is rotated to the locked position, it is turned off, no power is supplied to the solenoid, and the shutoff valve 76 shuts off the supply of pressure oil to the pilot valves 37 and 38.

  The work operation levers 34L and 34R are disposed on both the left and right sides of the front portion of the driver's seat 33 as shown in FIG. The work operation levers 34L and 34R perform the operation of the work machine 4 and the turning operation of the swing body 3. In this embodiment, the operation of the left work operation lever 34L can be operated to rotate the arm 14 back and forth and the swivel body 3 can be operated to the left and right, and the operation of the right work operation lever 34R can be operated to rotate the boom 12 back and forth. However, the present invention is not limited thereto. Pilot valves 37 and 38 for switching pilot oil passages for operating the working machine are arranged at the rotation bases of the work operation levers 34L and 34R, respectively, and the pilots are rotated by rotating the work operation levers 34L and 34R back and forth and right and left. The control valve 70 can be switched by switching the valves 37 and 38.

  The traveling operation levers 35L and 35R are arranged in a pair of left and right front parts in the left and right center of the control unit 40, in other words, in front of the driver's seat 33. The traveling operation levers 35L and 35R can be rotated forward to rotate the driving wheel 22 to advance the vehicle body, and can be rotated backward to rotate the driving wheel 22 backward to move the aircraft backward. Can be made. As shown in FIGS. 3 to 6, the rotating bosses 35La and 35Ra provided on the base side of the traveling operation levers 35L and 35R are freely rotatable on the traveling lever shaft 60 which is horizontally mounted on the front portion of the airframe. Arms 61L and 61R project downward from the rotating bosses 35La and 35Ra, and operating portions (spools) of the travel control valves 75L and 75R from below the arms 61L and 61R via the link mechanisms 62L and 62R. The travel control valves 75L and 75R are switched by rotating the travel operation levers 35L and 35R to drive the travel motors 25L and 25R. In addition, traveling pedals 63L and 63R are provided at the rotation bases of the traveling operation levers 35L and 35R, and can be operated by feet.

  The safety lever 50 is locked when the operator gets on and off, so that the hydraulic actuator is not operated even if the operator touches the operation levers 34L and 34R and the travel operation levers 35L and 35R by mistake, thereby preventing malfunction. The lever. In other words, when the safety lever 50 is rotated in the locking direction, the entrance 41 is released and the entry / exit is possible, and the control valve 70 is not switched even when the operation operation levers 34L and 34R are rotated, and the travel operation levers 35L and 35R are switched. Is locked non-rotatable. Thus, the hydraulic actuator does not operate even if the operator turns the work operation levers 34L and 34R and the travel operation levers 35L and 35R when getting on and off. In the present embodiment, the hydraulic actuators are the boom cylinder 13, the arm cylinder 15, the bucket cylinder 17, and the traveling hydraulic motors 25L and 25R.

  The safety lever 50 is disposed in the vicinity of the entrance 41 of the control unit 40. Specifically, as shown in FIG. 2 and FIG. 3, an entrance 41 is provided at the left front portion of the cabin 36 for an operator to get into and out of the driver's seat 33. The entrance 41 is provided by a door 36a. It can be opened and closed. However, the entrance / exit 41 may be configured to be disposed on both the left and right sides, or may be configured without a cabin. The safety lever 50 is disposed in the cabin 36 and diagonally to the left of the driver's seat 33 on the front side of the entrance 41, and a handrail 64 is disposed on the outer side thereof. The safety lever 50 protrudes upward from the floor 32 and is configured to be rotatable in the front-rear direction. As shown in FIG. 3, the position in which the safety lever 50 is rotated forward and moved up and down is defined as a boarding / leaving position (lock position). In this state, an operator can pass on the floor 32. When the safety lever 50 is in the locked position, the handrail 64 and the safety lever 50 are arranged at a position where they overlap in the side view, in other words, the safety lever 50 is arranged at a position hidden by the handrail 64 in the side view. Specifically, the handrail 64 has a rod-like body formed in a “U” shape in a side view and fixed to the front frame of the cabin 36 at a position outward of the safety lever 50, or is bent in an inverted U shape. The handrail 64 is arranged so as to be more easily gripped than the safety lever 50 when getting on and off, so that the unstable safety lever 50 is not gripped. Further, the safety lever 50 is rotated rearward, and the position at which the safety lever 50 is inclined or substantially horizontal is defined as a boarding / closing position (lock release position). In this state, the boarding / closing opening 41 is closed by the safety lever 50. As a result, the worker cannot pass.

  As shown in FIGS. 5 and 6, the lower end of the safety lever 50 is fixed to the safety lever shaft 51, and the safety lever shaft 51 is rotatably supported by the machine body (the swivel frame 31) below the floor 32. It is arranged in parallel in front of 61. A safety lever 50 extends upward from the left end of the safety lever shaft 51, and between the right side of the safety lever shaft 51 and the traveling lever shaft 60, a restricting means for restricting the rotation of the traveling operation levers 35L and 35R; An engaging portion 52 is formed. The engaging portion 52 includes an engaging protrusion 53 protruding from the safety lever shaft 51 and engaging recesses 54L and 54R protruding from the rotating bosses 35La and 35Ra. The engagement protrusion 53 is configured by a stay protruding from the safety lever shaft 51 and an engagement rod being horizontally disposed, and the engagement recesses 54L and 54R are protruded forward from the rotating bosses 35La and 35Ra, respectively. The recess has a shape that can be engaged with the engagement rod.

  The engaging recesses 54L and 54R are on the rotation locus of the engagement protrusion 53 in the neutral position (stop position where the traveling operation levers 35L and 35R are not rotated forward and backward), and the recesses are tangential to the rotation locus. It is open. When the safety lever 50 is rotated to the entrance / exit closed position (lock release position), the engagement protrusion 53 is disposed at a position that does not interfere with the engagement recess 54 when the travel operation levers 35L and 35R are rotated. Has been. On the other hand, the engaging recesses 54L and 54R have a configuration in which the opening of the recess is configured wide so that the engaging projection 53 can easily enter, and the bottom of the recess is configured narrowly so that backlash is unlikely to occur during engagement.

  In such a configuration, the engagement protrusion 53 and the engagement recesses 54L and 54R are engaged when the traveling operation levers 35L and 35R are rotated to the position where the safety lever 50 can be moved on and off when the traveling operation levers 35L and 35R are in the neutral position. 35R enters a locked state where it cannot rotate. When the safety lever 50 is rotated to the entrance / exit closed position, the engagement between the engagement protrusion 53 and the engagement recess 54 is released, and the travel operation levers 35L and 35R can be rotated.

  A lock switch 56 is disposed in the vicinity of the rotation base of the safety lever 50. The lock switch 56 is connected to a solenoid 76 a of an electromagnetic valve 76 that unloads the pressure oil supplied to the control valve 70. In the present embodiment, the contact body 55 is disposed to project downward from the left and right center of the safety lever shaft 51, and the lock switch 56 is fixed to the body so as to face the contact body 55. A contact of the lock switch 56 is disposed so as to be able to contact the contact body 55, and the contact body 55 is rotated together with the safety lever 50. However, the lock switch 56 may be fixed to the safety lever 50 side and the contact body 55 may be fixed to the machine body side.

  In such a configuration, when the safety lever 50 is rotated to the boarding / leaving position (lock position), the contact body 55 is also rotated, the lock switch 56 is turned off, the electromagnetic valve 76 is not switched, and the pilot hydraulic pump The pressure oil from 77 is drained, and even if the operation levers 34L and 34R are operated, the control valve 70 is not switched and the hydraulic actuator does not operate. When the safety lever 50 is rotated to the entrance / exit closed position (lock release position), the contact body 55 comes into contact with the contact of the lock switch 56 and is turned on, the electromagnetic valve 76 is switched, and the pressure oil from the pilot hydraulic pump 77 is switched on. Is fed to the control valve 70 and when the operation levers 34L and 34R are operated, the control valve 70 is switched and the hydraulic actuator is activated.

  The safety lever 50 is interlocked with a foot operation means. Specifically, a pedal arm 57 projects upward from the safety lever shaft 51, and an operation pedal 58 as a foot operation means is provided at the tip of the pedal arm 57. By depressing the operation pedal 58 downward, the safety lever 50 can be rotated to the boarding / closing position, and the lock can be released. That is, the operator can operate the safety lever 50 while sitting in the driver's seat 33. When locking, since the grip at the tip of the safety lever 50 is rotated to the vicinity of the driver's seat 33, it can be locked by pushing it forward by hand. The safety lever 50 can also be pushed forward with a foot.

  As another embodiment, as shown in FIG. 8, operation bodies 59 a and 59 b as foot operation means may be provided protruding from the safety lever 50. The operation body 59a shown in FIG. 8A is constituted by a rod (in a rod shape) and protrudes in the horizontal direction from the side surface of the safety lever 50 in the middle of the upper and lower sides. With such a configuration, the safety lever 50 can be rotated to the entrance / exit closed position so that the operation body 59a is hooked and pulled by the toe of the foot, and the lock can be released. When releasing, you can lock by stepping forward with your foot. The operation body 59b shown in FIG. 8 (b) is formed in a plate shape, protrudes from the lower side of the safety lever 50 to the side, and the operation body 59b is hooked with a foot tip or sole so that the safety lever 50 is pulled. Can be rotated to the boarding / closing position, and the lock can be released. When releasing, you can lock by stepping forward with your foot. As described above, the shape is not limited as long as the operation body 59 can be operated with a foot.

  As described above, the operation operation levers 34L and 34R that are arranged on both the left and right sides of the driver seat 33 and that can operate the work machine 4, and the traveling operation lever that is arranged in front of the driver seat 33 and can be operated to move forward and backward. 35L and 35R, and a safety lever 50 for operating the operation levers 34L and 34R and the traveling operation levers 3535L and R at the same time so as to be locked or releasable are disposed obliquely in front of the driver's seat 33 and in the vicinity of the entrance 41. Therefore, the operability for locking or releasing the safety lever 50 is improved. In addition, when the lock is released, the entrance / exit 41 is blocked by the safety lever 50, and an operator can be prevented from boarding at the entrance / exit. Further, since the foot operating means of the safety lever 50 is disposed in the vicinity of the rotating base portion of the safety lever 50, the grip of the safety lever 50 is diagonally forward of the driver seat 33 when the safety lever 50 is in the locked position. It is difficult to reach the hand in the release position because it is in a distant position, and it is difficult to operate the safety lever 50 to the release position by hand. However, by providing the foot operation means, the safety lever can be easily lifted by the foot while sitting in the driver's seat 33 50 can be operated, and it is not necessary to bend forward and operate with the hands away from the work operation levers 34L and 34R, and the operability is improved.

  Further, since the foot operating means is composed of the operation pedal 58 fixed to the safety lever shaft 51 which is the rotation shaft of the safety lever 50, the stepping operation can be easily performed and the locking and unlocking operations can be easily performed. it can.

  Further, since the foot operating means is constituted by an operating body 59 configured to project from the safety lever 50, the operating body 59 can be easily attached to the safety lever 50 with a simple configuration, and the operation is also easy. it can.

  Further, at the rotation base of the safety lever 50, a lock switch 56 for operating the shut-off valve 76 switched by the operation of the work operation levers 34L and 34R, and a restricting means for restricting the rotation of the travel operation levers 35L and 35R. Since the engaging portion 52 is disposed below the floor 32, it is not exposed on the floor 32, does not obstruct the operation, and is centrally disposed below the floor 32, so that maintenance is easy. it can. Further, since the safety lever 50 and the work operation levers 34L and 34R are not connected via a wire, a link, or the like, the operation load is not increased and the operability is not deteriorated. Further, when the safety lever 50 is disposed on the driver's seat 33 side, the locking means and the safety lever 50 are connected using a wire or a link in order to lock the traveling operation levers 35L and 35R, and the structure is complicated. Become. In addition, since the rotation direction of the safety lever 50 and the work operation levers 34L and 34R is the same direction, the operation is confused.

4 Working machine 32 Floor 33 Driver's seat 34L / 34R Work control lever 35L / 35R Travel control lever 41 Entrance / exit 50 Safety lever 52 Engagement part 56 Lock switch 76 Shut-off valve

Claims (3)

A swivel work vehicle in which a work operation lever that is disposed on both left and right sides of a driver's seat and that can operate a work machine and a travel operation lever that is disposed in front of the driver's seat and that can be operated to move forward and backward are disposed. ,
The work operation lever and the travel operation lever can be locked or released simultaneously by operating the safety lever,
The safety lever is disposed in the vicinity of the entrance / exit, and when unlocking, the entrance / exit is blocked by the safety lever,
A turning work vehicle characterized in that a foot operating means of the safety lever is disposed in the vicinity of the rotation base of the safety lever . The safety lever protrudes upward from the floor, and a lock switch that operates a shut-off valve that shuts off a pilot oil passage that is switched by operation of the work operation lever at a rotating base portion of the safety lever positioned below the floor 2. A turning work vehicle according to claim 1, further comprising a restricting means for restricting rotation of the travel operation lever . A swivel work vehicle in which a work operation lever that is disposed on both left and right sides of a driver's seat and that can operate a work machine and a travel operation lever that is disposed in front of the driver's seat and that can be operated to move forward and backward are disposed. ,
The work operation lever and the travel operation lever can be locked or released simultaneously by operating the safety lever,
The safety lever is disposed in the vicinity of the entrance / exit, and when unlocking, the entrance / exit is blocked by the safety lever,
The safety lever protrudes upward from the floor, and a lock switch that operates a shut-off valve that shuts off a pilot oil passage that is switched by operation of the work operation lever at a rotating base portion of the safety lever positioned below the floor And a turning means for restricting the rotation of the travel operation lever.

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