JP2001040711A - Construction machinery - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To simplify the configuration of a connecting portion between a getting-on / off lever and a lock valve. SOLUTION: A mounting block 45C is fixed to a base end side of a boarding / leaving lever 45, and a mounting block 45C is mounted to a rotation shaft 44 of a lock valve 41 provided on a lower surface side of a floor plate 5A, thereby prohibiting the boarding / leaving lever 45 from getting on and off. When rotating between the position and the getting on / off permission position, the turning shaft 44 is directly turned by the getting on / off lever 45. Accordingly, there is no need to interpose a link mechanism or the like between the getting on / off lever 45 and the rotation shaft 44 of the lock valve 41, and the configuration of the connecting portion between the getting on / off lever 45 and the lock valve 41 can be simplified, The number of parts and the number of assembly steps can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction machine such as a hydraulic shovel, a hydraulic crane, etc., and more particularly to a lift lever which pivots between a lift permission position for allowing the driver to get on and off the driver's seat and a lift prohibition position for which the ride is prohibited. The present invention relates to a construction machine provided with the above.

[0002]

2. Description of the Related Art In general, a construction machine such as a hydraulic excavator or a hydraulic crane operates a vehicle body having a driver's seat on a floor plate, a working device provided on the vehicle body so as to be capable of raising and lowering, and a pilot operation of the working device. Therefore, the pilot operation device is provided near the driver's seat, and the pilot operation device is arranged near the driver's seat, and pivots between a boarding / alighting permission position permitting getting on / off the driver's seat and a boarding / alighting prohibition position prohibiting getting on / off. An elevating lever, which is provided between the pilot operating device and a pilot hydraulic pressure source, which is located on the lower surface side of the floor plate, and when the elevating lever is brought to the egress / egress permission position by rotating a rotating shaft, And a lock valve for permitting the operation of the working device when the operation is stopped and the boarding / alighting prohibition position is reached.

A hydraulic excavator will be described as an example of this type of conventional construction machine with reference to FIGS. 6 to 8. FIG.

[0006] In FIG. 6, reference numeral 1 denotes an undercarriage, and 2 denotes an upper revolving body which is mounted on the undercarriage 1 via a revolving device 3 so as to be capable of turning and forms a vehicle body together with the undercarriage 1.
The upper swing body 2 includes a swing frame 4 and the swing frame 4.
A cab 5 provided on the upper front left side, a building cover 6 provided on the revolving frame 4 located on the rear side of the cab 5, a counterweight 7 provided on the rear end of the revolving frame 4, and the like. It is configured.

Reference numeral 8 denotes a working device provided at the center of the front of the revolving frame 4 so as to be able to move up and down. The working device 8 includes a boom 9 driven by a boom cylinder 9A, an arm 10 driven by an arm cylinder 10A, It is composed of a bucket 11 driven by a bucket cylinder 11A and the like.

Reference numeral 12 denotes a driver's seat provided on the floor plate 5A of the cab 5, and reference numerals 13 and 14 denote operation levers provided on both the left and right sides of the driver's seat 12. The operation levers 13 and 14 are shown in FIG.
As shown in the figure, a pilot operating device is constituted together with the pressure reducing valve type pilot valves 15 and 16, and the pilot valves 15 and 16 are operated by the operating levers 13 and 14 in the forward and rearward directions and in the left and right directions.

Here, the output side of the left pilot valve 15 is connected to the hydraulic pilot portions 17A, 17B of the directional control valve 17.
And the hydraulic pilot portions 18A, 18B of the direction control valve 18.
And connected to. The direction control valve 17 controls the direction of pressure oil supplied to and discharged from the turning motor 3A of the turning device 3 by the pilot pressure supplied from the pilot valve 15 to the hydraulic pilot sections 17A and 17B.
From the pilot valve 15 to the hydraulic pilot sections 18A, 1
The direction of the pressure oil supplied to and discharged from the arm cylinder 10A is controlled by the pilot pressure supplied to the arm cylinder 8B.

On the other hand, the output side of the right pilot valve 16 is connected to the hydraulic pilot portions 19A, 19B of the directional control valve 19.
And the hydraulic pilot portions 20A and 20B of the direction control valve 20.
And connected to. The direction control valve 19 controls the direction of pressure oil supplied to and discharged from the boom cylinder 9A by the pilot pressure supplied from the pilot valve 16 to the hydraulic pilot sections 19A and 19B. The bucket cylinder 11A is controlled by the pilot pressure supplied to the hydraulic pilot sections 20A and 20B from the hydraulic cylinder 16A.
To control the direction of pressure oil supplied and discharged to

Each of the directional control valves 17 to 20 constitutes a tandem circuit between a hydraulic pump 21 and a tank 22 which constitute a main hydraulic source, and each of the pilot valves 15, 16
Is connected to a pilot oil pressure source 24 via a pilot oil passage 23 and a lock valve 28 described later.

Reference numeral 25 denotes a lift lever which is located near the driver's seat 12 and is rotatably provided in the cab 5. The lift lever 25 is bent in a substantially rectangular shape as shown in FIG. Lever shaft 25A, a grip portion 25B provided on the distal end side of the lever shaft 25A, and a rectangular parallelepiped mounting block 2 fixed to the base end side of the lever shaft 25A by welding or the like.
5C. Then, the mounting block 25C is mounted on a support shaft 26 rotatably supported via a bracket (not shown) or the like on the upper surface side of the floor plate 5A.
The getting on / off lever 25 is centered on the support shaft 26, and the getting on / off permission position (the position indicated by the solid line) allowing the getting on / off to the driver's seat 12 and the driver's seat 12
The vehicle is rotated within a range of a rotation angle θ1 (approximately 45 degrees) between the vehicle and a boarding / alighting prohibition position (a position indicated by a two-dot chain line) where the vehicle is prohibited from getting on / off.

Reference numeral 27 denotes a link mechanism for connecting between the mounting block 25C and a lock valve 28 to be described later. The link mechanism 27 includes a front lever 27A fixed to a support shaft 26 and protruding forward, and a front end side being a front side. The insertion hole 5 is connected to the protruding end side of the lever 27A, and the rear end side is formed in the floor plate 5A.
B, a rod 27B extending rearward to the lower surface side of the floor plate 5A, a rear end side of the rod 27B and a rotating shaft 30 to be described later.
And a rear lever 27C connecting between the two.

Reference numeral 28 denotes a lock valve located on the lower surface side of the floor plate 5A and provided between each of the pilot valves 15, 16 and the pilot hydraulic pressure source 24.
As shown in the figure, the casing 29 includes a casing 29 and a rotating shaft 30 rotatably provided on the casing 29.

Here, the casing 29 includes an inlet 29A connected to the pilot hydraulic power source 24, an outlet 29B connected to the input side of each of the pilot valves 15, 16, an inlet 29A and an outlet 29B. Communication path 29C that connects between
And On the other hand, one end of the rotating shaft 30 in the axial direction protrudes outside the casing 29 and is connected to the rear lever 27C. The casing 2 of the rotating shaft 30
A portion orthogonal to the communication passage 29C in the portion 9 is a valve body portion in which an oil hole 30A penetrating in the radial direction is formed.

When the lift lever 25 is rotated between the getting on / off permission position and the getting on / off prohibiting position, the rear lever 27C of the link mechanism 27 is moved together with the rotating shaft 30 in the position indicated by the solid line and the position indicated by the two-dot chain line. And the rotation angle θ2 (approximately 90
(Degree) range. As a result, the rotating shaft 30 moves the communication passage 29 when the getting on / off lever 25 is at the getting on / off permission position.
C is shut off, and when the getting on / off lever 25 is in the getting on / off prohibiting position, the communication passage 29C is formed by the oil hole 30A.
Communication position.

Therefore, when the lift lever 25 is in the lift permission position, the lock valve 28 is set to the pilot valve 15,
Since the control valve 16 is shut off from the pilot hydraulic power source 24, the working device 8 remains stopped even when the operation levers 13 and 14 are operated. On the other hand, when the getting on / off lever 25 is in the getting on / off prohibiting position, the lock valve 28
Since the communication devices 5 and 16 communicate with the pilot hydraulic power source 24, the working device 8 can be operated in accordance with the operation of the operation levers 13 and 14.

Reference numeral 31 denotes a box-shaped cover for covering the link mechanism 27 and the like. The cover 31 is provided on the upper surface of the floor plate 5A.
When the operator gets on and off the driver's seat 12, the mud which has fallen from the feet of the operator is prevented from adhering to the link mechanism 27 or the like through the insertion hole 5B of the floor plate 5A.

The construction machine according to the prior art has the above-described configuration. When the operator gets on and off the driver's seat 12, the operator turns the elevator lever 25 to the getting-on / off permission position, and the lock valve 28 turns the pilot valve 15, Since the control valve 16 is shut off from the pilot hydraulic power source 24, the working device 8 remains stopped even when the operation levers 13 and 14 are operated. Accordingly, even if the operator accidentally touches the operation levers 13 and 14 at the time of getting on and off, it is possible to prevent the working device 8 from being carelessly operated, and it is possible to enhance the safety at the time of getting on and off.

When the operator turns the lever 25 to the prohibition position after sitting in the driver's seat 12, the lock valve 28 connects the pilot valves 15 and 16 to the pilot hydraulic power source 24, and the operation levers 13 and The working device 8 can be operated in response to the operation of 14.

[0019]

In the above-described construction machine according to the prior art, since the lift lever 25 and the lock valve 28 are connected by the link mechanism 27, the lift lever 25 and the lock valve 28 are connected to each other. There is a problem that the configuration of the connecting portion becomes complicated, and that the number of parts increases and the cost increases.

Further, since the cover 31 for protecting the link mechanism 27 and the like is provided on the upper surface side of the floor plate 5A, the floor plate 5A serving as a passage when the operator gets on and off the driver's seat 12 is provided.
The upper space is narrowed by the cover 31 and the driver's seat 1
There is a problem that quick getting on and off the vehicle 2 is prevented.

The present invention has been made in view of the above-described problems of the prior art, and simplifies the configuration of a connecting portion between a lift lever and a lock valve, reduces the number of parts, and secures a wide space for getting into and out of a driver's seat. An object of the present invention is to provide a construction machine that can be used.

[0022]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a vehicle body having a driver's seat on a floor plate, a working device provided on the vehicle body so as to be able to move up and down, and a working device. A pilot operation device provided near the driver's seat for pilot operation, and a pilot operation device arranged near the driver's seat;
A lift lever that pivots between a lift permission position that allows the driver to get on and off the driver's seat and a lift inhibition position that prohibits the driver from getting on and off, and a position between the pilot operating device and a pilot hydraulic power source that is located on the lower surface side of the floor plate. And a lock valve that stops the operation of the working device when the getting on / off lever is in the getting on / off position by rotating the rotating shaft and allows the working device to operate when the getting on / off position is in the prohibition position. Applied to machine.

A feature of the first aspect of the present invention is that the base end of the lift lever is attached to a rotation shaft of the lock valve, and the rotation shaft is directly connected to the rotation shaft of the lift lever. That is, it is configured to rotate.

With this configuration, there is no need to interpose a link mechanism or the like between the rotation shaft of the lock valve and the lift lever, and the structure of the connecting portion between the lock valve and the lift lever is simplified. This can contribute to a reduction in the number of parts.

Also, by attaching the base end of the lift lever to the rotation shaft of the lock valve provided on the lower surface side of the floor plate, only the distal end of the lift lever projects from the upper surface side of the floor plate. In addition, it is possible to secure a large boarding space on the floorboard, which is a passage when the operator gets on and off the driver's seat.

According to a second aspect of the present invention, an arm protruding radially outward from the rotation shaft is provided on the rotation shaft of the lock valve, and the lift lever is provided between the protruding end of the arm and the vehicle body. Is provided with a switching spring for switching the position to either one of the getting on / off permission position and the getting on / off prohibiting position.

With this configuration, when the operator turns the getting-on / off lever to the getting-on / off position when the operator gets on / off the driver's seat, the switching spring switches the getting-on / off lever to the getting-on / off position and holds the position. The operation of the working device can be stopped. Further, when the operator who gets into the driver's seat rotates the getting on / off lever to the getting on / off prohibiting position, the switching spring can switch the getting on / off lever to the getting on / off prohibiting position and hold this position, so that the working device can be operated. Can be kept.

According to a third aspect of the present invention, an elevator lever comprises a lever shaft having a grip on the distal end and a mounting member fixed to a base end of the lever shaft. It is configured to be attached to the rotation shaft at a position different from the fixed position.

With this configuration, when the lever shaft is rotated, the operation force is transmitted to the rotation shaft of the lock valve via the mounting member, so that the operation can be performed by the lift lever without the intervention of a link mechanism or the like. The driving shaft can be rotated directly.

According to a fourth aspect of the present invention, a stopper is provided on the casing of the lock valve so that the mounting member comes into contact with the casing when the elevator lever is rotated, thereby positioning the elevator lever between the getting on / off permission position and the getting on / off prohibiting position. Is provided.

With this configuration, the rotation of the getting-on / off lever is restricted at the position where the mounting member of the getting-on / off lever abuts against the stopper, and the getting-on / off lever can be positioned between the getting-on / off permission position and the getting-on / off prohibiting position. .

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a construction machine according to the present invention will be described below in detail with reference to FIGS. In the present embodiment, the same components as those of the above-described related art are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numeral 41 denotes a lock valve applied to the present embodiment in place of the lock valve 28 according to the prior art. The lock valve 41 is fixed to the lower surface side of the floor plate 5A using bolts 42, 42. The casing 43 is generally constituted by a casing 43 and a rotating shaft 44 rotatably provided on the casing 43.

Here, the casing 4 of the lock valve 41
3, an inlet 43A connected to the pilot hydraulic pressure source 24, an outlet 43B connected to the input side of each pilot valve 15, 16, an inlet 43A and an outlet 43B, as shown in FIG. And a communication passage 43C that communicates between them.

On the other hand, as shown in FIG.
One end in the axial direction is a protruding portion 44A protruding outside the casing 43, and the other end in the axial direction is an arm 4 described later.
9 are attached. Further, a portion of the rotating shaft 44 orthogonal to the communication passage 43C in the casing 43 is a valve body portion having an oil hole 44B penetrating in the radial direction as shown in FIG. The rotating shaft 44 is configured to rotate between a blocking position for blocking the communication passage 43C and a communication position for connecting the communication passage 43C through the oil hole 44B with respect to the casing 43.

Reference numeral 45 denotes a lift lever according to the present embodiment, which is disposed near the driver's seat 12 in place of the lift lever 25 according to the prior art. The lift lever 45 has a lever shaft 45A bent in a substantially rectangular shape. A grip 45B provided on the tip (upper end) side of the lever shaft 45A;
A is provided with a mounting block 45C as a mounting member fixed to the base end (lower end) side of A by welding or the like. The lower end side of the getting-on / off lever 45 is located near the lock valve 41 and is formed in the square hole 4 formed in the floor plate 5A.
6 extend to the lower surface side of the floor plate 5A.

Here, a shaft fitting hole 45D penetrating in the thickness direction is formed in a position of the mounting block 45C different from the position where the lever shaft 45A is fixed. Then, the projecting portion 44A of the rotating shaft 44 is fitted into the shaft fitting hole 45D, and the locking pin 41 is inserted into the projecting portion 44A and the mounting block 45C. The drive shaft 44 and the mounting block 45C of the getting on / off lever 45 are directly mounted without interposing a link mechanism or the like.

Accordingly, the getting on / off lever 45 is rotated about the rotating shaft 44, and the getting on / off lever 45 is turned between the getting on / off permission position indicated by a solid line and the getting on / off prohibiting position indicated by a two-dot chain line in FIG. When the rotating operation is performed at an angle θ1 (almost 45 degrees),
The turning shaft 44 is directly turned by the turning operation of the getting on / off lever 45. And the rotating shaft 44
When the getting on / off lever 45 is at the getting on / off permission position,
When the position of the communication passage 43C of the casing 43 is shut off (the position shown in FIG. 4) and the lift lever 45 is at the prohibition position, the oil hole 44B establishes a communication position for communicating the communication passage 43C.

Reference numeral 48 denotes a casing 43 of the lock valve 41.
The stopper 48 is provided on an end surface of the casing 43 from which the protrusion 44A of the rotation shaft 44 projects. The stopper 48 positions the lift lever 45 between a lift permission position and a lift prohibition position by the abutment of the mounting block 45C when the lift lever 45 rotates about the rotation shaft 44.

Reference numeral 49 denotes a rotating shaft 44 outside the casing 43.
Is a plate-like arm which is fixed to the other end of the arm by using bolts 50 and 50 and whose distal end protrudes radially outward.
A pin 51 for locking one end of a switching spring 55 to be described later is provided on the projecting end side of 9.

Reference numeral 52 denotes a spring mounting plate provided on the lower surface side of the floor plate 5A away from the lock valve 41 forward, and the spring mounting plate 52 is formed of an L-shaped plate body, and bolts 53, 53 It is fixed to the lower surface of the floor plate 5A by using, for example, the like. The spring mounting plate 52 is provided with a pin 54 for locking the other end of the switching spring 55.

55 is an arm 49 fixed to the rotating shaft 44
A switching spring provided between the spring mounting plate 52 and one end of the switching spring 55 is locked by the pin 51 of the arm 49, and the other end is locked by the pin 54 of the spring mounting plate 52. I have.

When the mounting block 45C comes into contact with the stopper 48 when the lever 45 is at the position where the getting on and off is allowed, the pin 51 of the arm 49 is moved to the axis of the rotating shaft 44 as shown by a broken line in FIG. Move below center. For this reason, the switching spring 55 gives a moment in the direction indicated by the arrow A to the rotating shaft 44, so that the mounting block 45C can be pressed against the stopper 48, and the switching spring 55 moves the getting on / off lever 45 to the getting on / off permission position. It can be switched and held.

On the other hand, when the lift lever 45 is in the lift-off position and the mounting block 45C comes into contact with the stopper 48, the pin 51 of the arm 49 is moved to the position of the rotation shaft 44 as shown by a two-dot chain line in FIG. Moves above the axis center. For this reason, the switching spring 55 gives a moment in the direction indicated by the arrow B to the rotating shaft 44, so that the mounting block 45C
Can be pressed against the stopper 48, and the switching lever 55 can be used to switch the lift lever 45 to the lift-off prohibition position and hold it.

Reference numeral 56 denotes a bellows-like cover provided on the lower end side of the elevator lever 45. The cover 56 is formed by molding a resin material such as elastic rubber or the like into a bellows shape, and the upper end side is formed on the elevator lever. 45, and the lower end is attached to the upper surface of the floor plate 5A by bolts or the like (not shown). The cover 56 is provided with the square hole 46 of the floor plate 5A.
When the operator gets on and off the driver's seat 12, the mud and the like dropped from the operator's feet are prevented from adhering to the lock valve 41 and the like through the square hole 46.

This embodiment has the above-described configuration, and when the operator gets on and off the driver's seat 12, the operator turns the getting on / off lever 45 to the getting on / off permission position. This allows
Since the lock valve 41 shuts off the pilot valves 15 and 16 with respect to the pilot hydraulic power source 24, each operating lever 1
Even if the user operates the buttons 3 and 14, the working device 8 remains stopped. For this reason, even if the operator accidentally touches the operation levers 13 and 14 when getting on and off, it is possible to prevent the working device 8 from being inadvertently operated, and to ensure safety when getting on and off.

When the operator turns on the getting on / off lever 45 to the getting on / off position after sitting on the driver's seat 12, the lock valve 41 connects the pilot valves 15 and 16 to the pilot hydraulic power source 24. Operation lever 1
The working device 8 can be operated in accordance with the operations of the operation units 3 and 14.

In this case, according to the present embodiment, the mounting block 45C fixed to the base end side of the lifting / lowering lever 45 is mounted on the rotation shaft 44 of the lock valve 41, and is rotated in accordance with the rotation operation of the lifting / lowering lever 45. Since the dynamic shaft 44 is configured to rotate directly, the configuration of the connecting portion between the elevator shaft 45 and the rotating shaft 44 of the lock valve 41 can be simplified. For this reason, the link mechanism 27 and the like used in the prior art are not required, so that the number of parts and the number of assembling steps can be reduced, and the manufacturing cost can be reduced as compared with the prior art.

The lock valve 41 is disposed on the lower surface of the floor plate 5A, and the mounting block 45C fixed to the base end of the lift lever 45 is mounted on the rotating shaft 44 of the lock valve 41 on the lower surface of the floor plate 5A. Therefore, only the tip end of the getting on / off lever 45 protrudes from the upper surface of the floor plate 5A. For this reason, it is possible to secure a wide space for getting on and off the floor plate 5A, which is a passage when the operator gets on and off the driver's seat 12, and to get on and off the driver's seat 12 quickly and safely.

In the above-described embodiment, the mounting block 45C is fixedly provided at the lower end side of the getting on / off lever 45,
Although the case where the mounting block 45C is attached to the rotating shaft 44 has been described as an example, the present invention is not limited to this. For example, as in a modified example shown in FIG. A fitting hole 61 is provided.
The base end of the lever shaft 45A may be fitted and fixed. In this case, instead of the mounting block 45C according to the embodiment, a block 62 having a shorter length than the mounting block 45C is mounted on the rotating shaft 44, so that the block 62 can be rotated when the getting on / off lever 45 is rotated. Is in contact with the stopper 48, and the getting on / off lever 45 can be positioned between the getting on / off permission position and the getting on / off prohibiting position.

In the above embodiment, the floor plate 5A
A spring mounting plate 52 is mounted on the lower surface side of the
Pin 54 of the arm 49 fixed to the rotating shaft 44
Although the case where the switching spring 55 is provided between the first and the second is described as an example,
The present invention is not limited to this. For example, a pin or the like that locks the switching spring 55 is provided on a member configuring the upper revolving structure 2 (vehicle body) such as the revolving frame 4, and the pin and the pin 5 on the rotating shaft 44 side are provided.
A configuration may be such that a switching spring 55 is provided between the switching spring 55 and the switching spring 55.

In the above-described embodiment, the lift lever 45 and the rotating shaft 44 of the lock valve 41 are substantially 45
Although the present invention has been described as rotating with a degree angle, the present invention is not limited to this, and the rotating angles of both can be set according to the getting on / off permission position of the getting on / off lever 45 and the getting on / off prohibiting position.

Further, in the above-described embodiment, a hydraulic excavator provided with the cab 5 is taken as an example of a construction machine. However, the present invention is not limited to this. For example, a hydraulic excavator provided with a canopy instead of the cab 5 may be used. May be applied, and
For example, it can be widely applied to other construction machines such as a hydraulic crane and a wheel loader.

[0054]

As described above in detail, according to the first aspect of the present invention, the base end side of the lift lever is attached to the rotation shaft of the lock valve, whereby the lift lever rotates in response to the rotation operation of the lift lever. Since the shaft is directly rotated, there is no need to interpose a link mechanism between the rotation axis of the lock valve and the lift lever, and the structure of the connection between the lock valve and the lift lever is simplified. can do. Therefore, the number of parts and the number of assembly steps can be reduced, and the manufacturing cost can be reduced.

Further, by attaching the base end side of the lift lever to the rotation shaft of the lock valve provided on the lower surface side of the floor plate,
Only the tip end of the getting on / off lever projects from the upper surface of the floor plate. This makes it possible to ensure a wide boarding space on the floor plate, which is a passage when the operator gets on and off the driver's seat, and can quickly get on and off the driver's seat.

According to the second aspect of the present invention, an arm protruding radially outward from the rotation shaft is provided on the rotation shaft of the lock valve, and between the protruding end of the arm and the vehicle body side. Since the switching spring is provided, when the operator turns the getting-on / off lever to the getting-on / off permission position when the operator gets on / off the driver's seat, the switching spring switches the getting-on / off lever to the getting-on / off permission position and holds it in this position. The operation of the device can be stopped. Further, when the operator in the driver's seat turns the getting-on / off lever to the getting-on / off prohibiting position, the switching spring switches the getting-on / off lever to the getting-on / off prohibiting position and holds this position, thereby keeping the working device operable. be able to.

According to the third aspect of the present invention, the getting on / off lever comprises a lever shaft having a grip on the distal end and a mounting member fixed to the base end of the lever shaft. Since the lever shaft is attached to the rotation axis of the lock valve at a position different from the position where the lever axis is fixed, the operating force on the lever axis can be directly transmitted to the rotation axis of the lock valve via the mounting member. The rotation shaft can be directly rotated in accordance with the rotation operation of the getting on / off lever without interposing a link mechanism or the like.

Further, according to the fourth aspect of the present invention, the lock valve casing is provided with a stopper for positioning the elevating / leaving lever between the getting-on / off permission position and the getting-on / off prohibiting position by abutting the mounting member of the elevating / leaving lever. Therefore, when the mounting member comes into contact with the stopper during the rotation operation of the getting on / off lever, the getting on / off lever can be reliably positioned between the getting on / off permission position and the getting on / off prohibiting position.

[Brief description of the drawings]

FIG. 1 is an enlarged front view showing a main part of a lock valve, a getting on / off lever, and the like according to an embodiment of the present invention in an enlarged manner.

FIG. 2 is a perspective view of a lock valve, a getting on / off lever, a switching spring, and the like as viewed from a lower surface side of a floor plate.

FIG. 3 is a cross-sectional view showing a lock valve, a lift lever, a switching spring, and the like, as viewed from a direction indicated by arrows III-III in FIG.

FIG. 4 is a hydraulic circuit diagram including a lock valve, a pilot hydraulic source, a pilot operating device, hydraulic actuators of a working device, and the like according to the present embodiment.

FIG. 5 is an enlarged front view of the same position as FIG. 1 showing a modification of the present invention in which the lever shaft of the getting on / off lever is directly attached to the rotation shaft of the lock valve.

FIG. 6 is a front view of a hydraulic excavator provided with a getting-on / off lever according to the related art.

FIG. 7 is a hydraulic circuit diagram including a lock valve, a pilot hydraulic power source, a pilot operating device, hydraulic actuators of a working device, and the like according to the related art.

FIG. 8 is an enlarged front view showing a getting-on / off lever, a lock valve, a link mechanism, and the like according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lower traveling body (vehicle body) 2 Upper revolving superstructure (vehicle body) 5A Floor plate 8 Working device 12 Driver's seat 13, 14 Operating lever (pilot operating device) 15, 16 Pilot valve (pilot operating device) 24 Pilot hydraulic power source 41 Lock valve ( Lock valve) 43 Casing 44 Rotating shaft 45 Elevating lever 45A Lever shaft 45B Gripping portion 45C Mounting block (mounting member) 48 Stopper 49 Arm 55 Switching spring

Claims (4)

[Claims] 1. A vehicle body provided with a driver's seat on a floor plate, a working device provided on the vehicle body so as to be able to move up and down, and a pilot operating device provided near the driver's seat for piloting the working device A lift lever that is disposed near the driver's seat and that rotates between a lift permission position that allows getting into and out of the driver's seat and a lift prohibition position that prohibits getting on and off, and is located on the lower surface side of the floor plate. Provided between the pilot operating device and the pilot hydraulic power source, the operation of the working device is stopped when the elevator shaft is turned to the getting on / off position by rotating the rotating shaft, and the operation is performed when the getting on / off position is reached. In a construction machine comprising a lock valve permitting operation of the device, the lift lever is attached at its base end to a rotation shaft of the lock valve, and the rotation shaft is directly connected to a rotation operation of the lift lever. Construction machine is characterized in that a structure which rotates. An arm protruding radially outwardly from a rotation axis of the lock valve, wherein the lift lever is provided between a protruding end of the arm and the vehicle body, and a lift permission position and a lift inhibition position. The construction machine according to claim 1, wherein a switching spring that switches between the two is provided. 3. The climbing lever comprises a lever shaft having a grip on the distal end side, and a mounting member fixed to a base end side of the lever shaft. The mounting member is located at a position where the lever shaft is fixed. The construction machine according to claim 1, wherein the construction machine is configured to be attached to the rotation shaft at a different position from the rotation shaft. 4. The lock valve casing is provided with a stopper for positioning the lift lever in a lift permission position and a lift prohibition position by contacting the mounting member when the lift lever rotates. The construction machine according to claim 3, wherein