JP2003119828A - Working vehicle with means for elevating operator's cab - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it easy to get on and off the operator's cab when the cab is raised of a working vehicle having an operator's cab elevating means, while also making it easy to lower the operator's cab stopped in a raised position due to trouble and get on and off the operator's cab when it is in a lowered position. SOLUTION: The operator's cab rise and fall means 10 for raising and lowering the operator's cab 8 has a scaffold 18 for getting on and off the operator's cab. A hydraulic fluid releasing means is provided for releasing the hydraulic fluid of a hydraulic cylinder of a drive means 16 for the rise and fall means 10. Further, the operator's cab is equipped with a passage 48 and a scaffold 52 therebelow.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work vehicle provided with a cab raising / lowering means.

[0002]

2. Description of the Related Art In a field such as waste disposal, a high cab type vehicle is used in which a driver's cab of a work vehicle such as a hydraulic excavator is arranged at a high position. In addition, the driver is provided with a better field of view, and materials and waste materials can be efficiently put into a hopper, a shredder, a dump truck loading platform, etc. located at a high position. As a high-cab specification vehicle, a fixed-type high-cab specification vehicle in which the driver's cab is fixed in advance to a high position of the vehicle body, and a lifting type high-cab equipped with an elevating means for moving the driver's cab up and down with respect to the vehicle body There is a specification car.

A typical example of the driver's cab elevating means is disclosed in, for example, Japanese Utility Model Laid-Open No. 60-193873. The elevating means includes a parallel link mechanism between the driver's cab and the driver's cab, and a drive cylinder for driving the parallel link mechanism. Then, the operator's cab is moved up and down between the "up position" and the "down position" by expanding and contracting the drive cylinder. The driver positions the driver's cab in the "down position" and gets on and off. The operation of raising and lowering the cab is performed in the cab.

[0004]

The work vehicle equipped with the cab raising / lowering means having the above-mentioned configuration has the following problems to be solved.

(1) Getting off from a driver's cab at a high position: When it is impossible to lower the raised driver's cab due to a failure of a work vehicle, a failure of driver's cab lifting means, etc. Getting off from the cab is difficult. To get out of the cab, you will need a stepladder, ladder, rope, or other means.

(2) Repair of driver's cab that cannot descend: Even if the driver can get off from the driver's cab stopped at a high position,
Since the driver's cab is located at a high position, it is difficult to carry a work vehicle for repair and repair.

(3) Getting on and off the driver's cab at the lowered position:
The cab of a work vehicle provided with a cab raising / lowering means has a higher position in the lowered position and is less likely to get in and out of the cab, as compared with the cab of a work vehicle in which the cab is directly attached to the vehicle body without the raising / lowering means. .

The present invention has been made in view of the above facts, and its technical problem is to enable a work vehicle equipped with a driver's cab elevating means to easily get on and off a lifted driver's cab and to raise the driver's cab. (EN) Provided is a work vehicle provided with a cab raising / lowering means that can easily lower a cab that has been stopped due to a failure or the like and can also easily get on and off the cab in a lowered position. .

[0009]

According to a first aspect of the present invention, there is provided a cab raising / lowering means for raising and lowering a cab between a "raising position" and a "lowering position" with respect to a vehicle body. Is a scaffold for getting on and off, and is a work vehicle provided with a cab raising / lowering means.

The scaffolding provided in the driver's cab lifting means for connecting the driver's cab and the vehicle body allows the driver to easily get on and off the driver's cab.

According to a second aspect of the present invention, in the work vehicle provided with the cab raising / lowering means according to the first aspect, the scaffold is arranged so as to be able to get on and off at least in the raised cab. .

[0012] Then, it is possible to easily get on and off the cab at the elevated position.

According to a third aspect of the present invention, in a work vehicle including the cab raising / lowering means according to the first or second aspect, the cab raising / lowering means includes a base provided on a vehicle body and the base. A parallel link that connects the driver's cab and a link driving unit that drives the parallel link are provided, and the scaffold is provided on the parallel link.

Then, a scaffold is provided on the link connecting the driver's cab and the vehicle body so that the operator can get on and off the driver's cab.

According to a fourth aspect of the present invention, in a work vehicle including the cab raising / lowering means according to the third aspect, the link driving means includes a hydraulic cylinder and a control valve for supplying and discharging hydraulic oil to and from the hydraulic cylinder. And a hydraulic oil releasing means which is interposed between the hydraulic cylinder and the control valve and can arbitrarily release the hydraulic oil trapped in the hydraulic cylinder.

Then, the working oil trapped in the hydraulic cylinder for holding the cab in the raised position is released, and the cab can be lowered.

According to a fifth aspect of the present invention, in a work vehicle provided with the cab raising / lowering means according to any one of the first to fourth aspects, the cab has a passage at a part or the entire circumference of the rim. Is equipped with.

The passage in the periphery of the cab makes it easier to get on and off the cab.

According to a sixth aspect of the present invention, in a work vehicle provided with the cab raising / lowering means according to the fifth aspect, the cab is provided with a scaffold for getting on and off the passage below the passage. There is something.

When the driver's cab is in the lowered position, the driver can use the scaffolding below the passage to get on and off the driver's cab.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION With reference to the accompanying drawings, which illustrate a preferred embodiment of a hydraulic excavator, which is a typical working vehicle, of a working vehicle equipped with raising / lowering means for a driver's cab constructed according to the present invention, , Will be described in more detail.

Referring to FIGS. 1 to 3, a hydraulic excavator generally designated by the numeral 2 is a crawler type undercarriage 4.
And an upper revolving structure 6 which is a vehicle body mounted on the lower traveling structure 4 so as to be horizontally rotatable. The driver's cab 8 is placed on the upper revolving member 6 by the driver's cab lifting means 10 in the “raised position (FIG. 1)”. It is attached so that it can move up and down between the "" and "lower position (Fig. 2)". The driver's cab 8 has a door 8a for getting in and out on the left side.
Is equipped with. Although not shown, the upper swing body 6
Is equipped with a working arm including a boom and an arm, and a working device such as a bucket attached to the tip of the working arm.

The cab raising / lowering means 10 includes a base 12 provided on the upper swing body 6, a parallel link 14 connecting the base 12 and the cab 8, and a link driving means 16 for driving the parallel link 14. Is equipped with. The parallel link 14 is provided with a scaffold 18 for getting on and off the cab 8.

The parallel link 14 comprises a pair of parallel links consisting of an upper link 14a and a lower link 14b in the left-right width direction of the upper revolving structure 6 (direction perpendicular to the plane of FIG. 1 and FIG. 2, vertical direction in FIG. 3). I have it. A pair of upper links 14a, 1
One end of each of 4a and the pair of lower links 14b, 14b is formed into a bifurcated shape, and is sandwiched between a pair of left and right support plates 8b, 8b protruding from the rear portion of the operator's cab 8 in the vertical direction by a pin 20. It is rotatably attached.
A pair of upper links 14a, 14a and a pair of lower links 1
The other end of each of 4b and 14b has a pin 22 between the left outer support plate 12a and the left inner support plate 12b provided upright on the base 12, and between the right outer support plate 12c and the right inner support plate 12d.
It is attached so as to be vertically rotatable.

Between the upper and lower links 14a and 14b on the left and right that connect the cab 8 and the base 12, hydraulic hoses and electric wires connecting the cab 8 and the upper swing body 6 are well-known link chains. It is guided and arranged by 24 (FIG. 3).

Continuing the description with reference to FIGS. 4 to 6 together with FIGS. 1 to 3, the upper link 14a and the lower link 14b will be described.
Are basically formed in the same shape, and on the upper surface of the upper link 14a on the left side of the pair of left and right upper links 14a, 14a (the front side of the paper of FIGS. 1 and 2, the lower side of FIG. 3), A plurality of (three in the present embodiment) steps 18a forming the above-mentioned scaffold 18 in the extending direction form a bar or pipe into a U-shaped gate shape, and both ends thereof are raised. The link 14a is integrally mounted and arranged (FIG. 5). The plurality of steps 18a forming the scaffold 18 include
It is possible to get on and off the raised cab 8 (Figs. 1 and 4).
It is installed at a predetermined interval and size.

The base 12 includes the left outer support plate 12a, the left inner support plate 12b, and the above-described left outer support plate 12a on the revolving structure frame 6a of the upper revolving structure 6.
In addition, the right outer support plate 12c and the right inner support plate 12d are integrally formed upright. On the outer surface of the left outer support plate 12a, a plurality of pieces (three pieces in this embodiment) are arranged vertically.
Step 12e is formed by forming a rod or pipe into a U-shaped gate shape, and both ends are integrally attached to the left outer support plate 12a (FIG. 6).

The link driving means 16 will be described with reference to FIG. 7 together with FIG. The link drive means 16 is a pair of left and right hydraulic cylinders 26, 26 respectively mounted between the ends of the pair of left and right lower links 14b, 14b on the cab 8 side and the lower portion of the lower link 14b mounting portion of the base 12. When,
A control valve 28 for supplying and discharging hydraulic oil to and from the hydraulic cylinder 26
And a hydraulic oil releasing means 30 which is interposed between the hydraulic cylinder 26 and the control valve 28 and can arbitrarily release the hydraulic oil trapped in the hydraulic cylinder 26. Control valve 28
Is a three-position solenoid directional control valve, and in the neutral position (the position shown in FIG. 7) in which power is not supplied, the hydraulic pump 32 and the tank 34 are disconnected from the hydraulic cylinders 26, 26, and the power is supplied in either direction. When switched to, the discharge oil of the hydraulic pump 32 is supplied to the oil chamber on the head side or the rod side of the hydraulic cylinder 26. Further, the hydraulic oil in the other oil chamber of the hydraulic cylinder 26 is discharged to the tank 34.

The control valve 28 is installed in the upper swing body 6, and an electric switch (not shown) for operating the control valve 28 is installed in the operator's cab 8.

Thus, when the electric switch of the control valve 28 is operated in the cab 8, the control valve 28 is switched,
Hydraulic oil is supplied to and discharged from the hydraulic cylinders 26, 26, the parallel link 14 is driven, and the operator's cab 8 is in the "up position (Fig. 1)" in which the hydraulic cylinder 26 is extended and in the "down position (Fig. 2)" in which it is contracted. It goes up and down between.

The hydraulic oil releasing means 30 is a hydraulic cylinder 26.
A normally-open two-position manual switching valve 38 provided in an oil passage 36 that connects the head-side oil chamber to the control valve 28 and an oil passage 40 that connects the rod-side oil chamber to the control valve 28 are connected to the tank. 34,
The check valve 42 is provided to connect by allowing only the flow in the direction of the oil passage 40. When manually switched to the operating position, the manual switching valve 38 closes the oil passage 36 that connects the oil chamber on the head side of the hydraulic cylinder 26 and the control valve 28, and connects the oil chamber on the head side to the tank 34. The oil passage 44 to the tank 34 is provided with a variable throttle valve 46. The manual switching valve 28 and the variable throttle valve 46 are provided in the upper swing body 6.

Therefore, when the operator's cab 8 is raised (FIG. 1) and the control valve 28 of the link drive means 16 is in the neutral position (FIG. 7), the manual switching valve 38 is switched to operate the hydraulic cylinder 26. The oil chamber on the head side of the hydraulic cylinder 26 is opened to the tank 34 via the oil passage 36 and the variable throttle valve 46, and the oil chamber on the head side of the hydraulic cylinder 26 communicates with the tank 34 via the oil passage 40 and the check valve 42. The hydraulic oil trapped in the hydraulic cylinder 26 is released, the hydraulic cylinder 26 is contracted, and the cab 8 is lowered. Variable throttle valve 4
By changing the opening degree of 6, the descending speed can be arbitrarily changed.

Referring to FIGS. 8 and 9 together with FIGS. 1 and 3, a rectangular cat, which is a passageway, is formed in the left side surface portion and the front surface portion of the operator's cab 8 where the entrance / exit door 8a is provided. Walks 48 and 50 are provided, respectively. Anti-slip plates 48a and 50a are attached to the upper surfaces of the catwalks 48 and 50, which are the tread surfaces. The cab 8 is also provided with a step 52 below the catwalk 48, which is a scaffold in which a round bar member or a pipe member, which is a scaffold for getting on and off the catwalk 48, is formed by bending and protruding downward. . further,
Below the catwalk 48, a handle 54 formed by bending a round bar member or a pipe member into an L shape is provided.

The operation of the hydraulic excavator 2 which is a work vehicle equipped with the cab raising / lowering means as described above will be described.

(1) Getting off from a driver's cab at a high position: Explaining mainly with reference to FIGS. 1 and 3, the driver's cab is connected to one of the pair of upper links 14a of the driver's cab elevating means 10 for raising and lowering the driver's cab 8. Since a plurality of steps 18a that are scaffolds 18 for getting on and off the vehicle 8 are provided, and catwalks 48 and 50 that are passages are further provided on the periphery of the operator's cab 8, for example, a control valve of the operator's cab elevating means 10 is provided. If 28 (FIG. 7) does not work due to a failure of the electric system and the cab 8 cannot be lowered, the door 8a of the cab 8 must be opened in order to get off the cab 8 (FIG. 1) at a high position. Open, move to catwalks 48, 50, scaffolding 18 for parallel links 14
It is possible to easily get off on the upper swing body 6 by passing through the step 12e of the base 12. On the contrary, it is also possible to easily climb to the cab 6 at a high position.

(2) Repair of driver's cab which cannot be lowered: To lower driver's cab 8 which cannot be lowered due to malfunction of control valve 28 of link driving means 16 (FIG. 7), malfunction of power source, hydraulic power source, etc. By switching the manual switching valve 38 of the hydraulic oil releasing means 30 of the link driving means 16 to release the hydraulic oil trapped in the hydraulic cylinder 26,
The cab 8 can be easily lowered. Further, by arbitrarily restricting the flow of the hydraulic oil discharged by the variable throttle valve 46, the operator's cab 8 can be gently and slowly lowered at an arbitrary speed.

(3) Getting in and out of the driver's cab at the lowered position: Since the step 52 and the handle 54 are provided below the catwalk 48 provided on the periphery of the operator's cab 8, the driver's cab 8 is completely lowered. Even at the position (FIG. 2), it is possible to easily get on and off the cab 8.

Although the present invention has been described in detail above based on the embodiments, the present invention is not limited to the above embodiments, and various modifications are possible within the scope of the present invention, for example, as described below. It can be transformed or modified.

(1) Driver's cab raising / lowering means: In this embodiment, the parallel link 14 is used as the driver's cab raising / lowering means 10, but the driver's cab raising / lowering means raises and lowers the driver's cab with respect to the vehicle body. As long as it can do so, it may be, for example, a slide type elevating means. In the case of the sliding type lifting means, the sliding member may be provided with a scaffold.

(2) Scaffolding for getting on and off the driver's cab: In the present embodiment, a plurality of steps 18a as scaffolds 18 for getting on and off the driver's cab 8 are suitable when the driver's cab 8 is raised. However, if the driver's cab 8 is lowered according to the form of the work vehicle, the scaffolding may be suitably arranged in the driver's cab lifting means in that condition.

(3) Step of base: In the present embodiment, the base 12 provided on the upper swing body 6 which is the vehicle body
Although step 12e is also provided, step 12e of the base 12 is omitted if the scaffold 18 of the parallel link 14 of the cab elevating means 10 can be directly accessed from the vehicle body depending on the form and size of the work vehicle. be able to.

(4) Scaffold shape: In the present embodiment, the step 18a as the scaffold 18 is formed by bending a round bar member or a pipe member, but may be formed by a plate member. . Alternatively, the parallel link 14
You may form a step in itself.

[0043]

According to the working vehicle having the cab raising / lowering means constructed according to the present invention, the working vehicle having the cab raising / lowering means can easily get on and off the raised cab and is also raised. (EN) Provided is a work vehicle including a driver's cab elevating means, which can easily lower a driver's cab stopped at a position due to a failure or the like, and can also easily get on and off a driver's cab in a lowered position.

[Brief description of drawings]

FIG. 1 shows a hydraulic excavator, which is a work vehicle equipped with cab raising / lowering means configured according to the present invention, in a cab “elevated position”.
The side view shown by.

FIG. 2 is a side view showing the hydraulic excavator shown in FIG. 1 in a cab “down position”.

FIG. 3 is a plan view showing an enlarged view as seen in the direction of arrow AA in FIG.

FIG. 4 is an enlarged view of a portion indicated by reference numeral B in FIG.

5 is an enlarged cross-sectional view as seen in the direction of arrows CC in FIG.

FIG. 6 is an enlarged cross-sectional view as seen in a direction of arrows D-D in FIG. 4.

FIG. 7 is a hydraulic circuit diagram of link drive means.

FIG. 8 is an enlarged view of a portion indicated by reference symbol E in FIG.

9 is a diagram viewed in the direction of arrow FF in FIG.

[Explanation of symbols]

2: Hydraulic excavator (work vehicle) 6: Upper revolving structure (car body) 8: Driver's cab 10: Driver's cab lifting means 12: Base 14: Parallel link 16: Link drive means 18: Scaffold 26: Hydraulic cylinder 28: Control valve 30: hydraulic oil releasing means 48: Catwalk (passage) 50: Catwalk (passage) 52: Step (scaffold)

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toshimi Omiya             22-2 Sakura 1-2-chome, Setagaya-ku, Tokyo             Within Ruma Technica Co., Ltd. F-term (reference) 2D015 EA04

Claims (6)

[Claims] 1. A cab raising / lowering means for raising and lowering the cab between a "raised position" and a "lowered position" with respect to a vehicle body is provided with a scaffold for getting on and off the cab. A work vehicle equipped with a cab lifting means. 2. The work vehicle including the cab raising / lowering means according to claim 1, wherein the scaffold is disposed so as to be able to get on and off at least in a raised cab. 3. The cab raising / lowering means includes a base provided on a vehicle body, and a parallel link connecting the base and the cab,
A work vehicle comprising a driver's cab elevating means according to claim 1 or 2, further comprising a link driving means for driving the parallel link, wherein the scaffold is provided on the parallel link. 4. The link drive means includes a hydraulic cylinder,
A control valve for supplying and discharging hydraulic oil to and from the hydraulic cylinder; and a hydraulic oil releasing means interposed between the hydraulic cylinder and the control valve for arbitrarily releasing the hydraulic oil trapped in the hydraulic cylinder. A work vehicle comprising the cab raising / lowering means according to claim 3. 5. A work vehicle provided with the cab raising / lowering means according to claim 1, wherein the cab is provided with a passage in a part or the entire circumference of a peripheral edge thereof. 6. A work vehicle provided with a cab elevating means according to claim 5, wherein the cab is provided with a scaffolding for getting on and off the passage below the passage.