JP2002227245A - Onboard ladder support means for hydraulic shovel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an onboard ladder support means of a free structure, which can be housed in a part of a space in a vehicle, can be easily taken out from the housed portion and hooked on a desired work location when used, ensures safe operation of the operator, and can be arbitrarily moved to a required location when used. SOLUTION: In a hydraulic shovel, a ladder 12 is removably housed in the space 11 defined by an engine mounting portion and a counterweight, via a lower opening 7 of an engine compartment 6. When the ladder is not used, an upper insertion guide mechanism 15 and a lower portion of the ladder are fixed to a wall surface of the space 11 by means of engaging tools 20. On the other hand, when used, the ladder 12 is supported by hooking a hook piece 12c at an upper portion of the ladder 12 on a support member 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ladder mounting structure for facilitating inspection and repair work around an engine of a large hydraulic excavator. More specifically, the present invention relates to a space formed in an engine mounting portion when not in use. The present invention relates to an in-vehicle ladder supporting means of a hydraulic excavator having a function of being stored and used and pulled out when used and arranged at a required position.

[0002]

2. Description of the Related Art Generally, construction machines such as hydraulic shovels require regular or irregular inspection of each part. In particular, inspection around the engine is a power source for driving the vehicle or operating the work machine, so that inspection and maintenance is important. In particular, in the case of large models, the engine mounted on the upper revolving unit is located at a relatively high position from the ground surface (generally, the height from the ground surface to the lower surface of the revolving frame of the upper revolving unit is approximately 1550 mm in height). Has become.)
And it is located at a higher position than the frequently used small ones, so that the operator is not in a state of directly checking from the ground.

[0003] Therefore, in such a large-sized model, a worker climbs on the upper revolving unit to perform an inspection work. Alternatively, he works on a ladder by climbing to the required position. For this reason, it is necessary to prepare a ladder, so that it is inconvenient to prepare a separate ladder, so that the ladder can be mounted on a vehicle. However, the mounting of the ladder on the vehicle must be unobtrusive during running and normal work. Under such circumstances, for example, Japanese Patent Application Laid-Open No. 4-29762
No. 5, JP-A-7-189294 or Japanese Utility Model Laid-Open Publication No. 6-87465 has proposed such a method.

Japanese Patent Application Laid-Open No. 4-297625 describes that
At one edge of the opening on the lower surface side of the revolving frame, one end of a ladder is attached so that it can swing up and down via a hinge, and the other edge of the ladder is connected to the other end of the opening by a bolt. Use this ladder so that it can be attached to and detached from the rim, remove the bolts as necessary, swing the ladder around the hinge, and support the opposite hinge side end on the ground. It has a configuration that can be inspected and maintained. Japanese Patent Application Laid-Open No. 7-189294 discloses a method in which locking portions are provided on upper and lower portions on the rear surface side of a counterweight provided at the rear portion of an upper revolving structure, and are detachably attached to the upper and lower locking portions. There has been disclosed a ladder that is locked, and when it is not used, the posture is changed and the ladder is stored in the lower surface portion of the upper swing body. In the apparatus disclosed in Japanese Utility Model Laid-Open Publication No. 6-87465, a ladder is provided on a lower lower surface of an upper revolving structure along a guide rail by a hydraulic cylinder along a guide rail, and the ladder is pushed out during use. A ladder can be arranged on the side of the vehicle body, and the ladder can be retracted and stored in the lower surface of the upper revolving structure when not in use.

[0005]

As described above, with regard to the attachment of a ladder used for inspection and maintenance of a large hydraulic excavator in the prior art, one end is generally supported on the lower surface of an upper revolving structure, and the support is used during use. The other end is grounded with respect to the end so that the worker can move up and down, and when not in use, is stored along the lower surface of the upper revolving unit. Incidentally, the above-mentioned Japanese Patent Application Laid-Open No. 4-29
No. 7625, the ladder is attached to the opening provided on the lower surface of the frame of the upper revolving structure, so that it can be used only under such conditions, and It can only be used.

Further, in the apparatus disclosed in Japanese Patent Application Laid-Open No. Hei 7-189294, a ladder is detachably engaged with an engaging portion provided on a rear surface portion of the counterweight, so that an operator can move up and down. When not in use, it is described that the ladder can be mounted and stored on the lower surface of the upper turning frame by tilting and rotating the ladder horizontally with reference to the link provided on the support part in the middle part and the mounting shaft on the turning frame side, The lower part of the upper revolving superstructure requires a complicated operation of changing the direction of the ladder and pulling out the ladder to stand up each time it is used. On the other hand, 6-8
Japanese Patent Application Publication No. 7465 discloses that the purpose of use is to make it convenient for a driver to get on and off the driver's cab, and it is also used for a specific location.

[0007] The ladders to be used at the time of inspection and maintenance of these conventional large-sized hydraulic excavators are all mounted on a turning frame and fixed to the lower surface portion of the turning frame when not in use. Therefore, there is an advantage that it can be used by always moving integrally with the vehicle and being released during inspection and maintenance, but the installation location is limited to a fixed location. Therefore, it is convenient as an elevating means when working up the upper part of the vehicle with the ladder at the time of work, but when working on a ladder when working on the ladder, it is convenient for work. Although there is no problem, it is dangerous if, for example, the user takes a posture with his / her foot on the ladder and working with the ladder as a back. However, since the direction of the ladder is specified as described above, when working in a different direction, the worker must work while changing the posture while checking the safety, and generally, such as safety shoes There is a problem that the risk is high when using a ladder while wearing work shoes with low flexibility.

In addition, when the ladder is attached to the vehicle body, there is no freedom for movement to the inspection position in inspection work or the like. Inconvenient. In order to solve such a situation, it is necessary to prepare a ladder that can be used freely, but in order to be able to move with the vehicle, mount the ladder in a state that does not hinder the running of the vehicle. It is required to be mounted. However, storing and holding the ladder in a part of the vehicle in a free state,
This type of construction machine, in which vibrations and the like are caused by intense work, is substantially difficult. Under these circumstances,
The ladder is provided so as to be connected to a part of the vehicle body as described above.

The present invention has been made in view of such circumstances, and can be stored in a partial space of a vehicle without any trouble during normal work. Of a hydraulic excavator with a free structure that can be freely moved and used in a direction where a safe posture can be taken according to the work situation It is intended to provide a vehicle-mounted ladder support means.

In order to achieve the above-mentioned object, a vehicle ladder supporting means for a hydraulic shovel according to the present invention is formed between an engine mounting portion and a counterweight of the hydraulic shovel. The ladder is housed in the space part which can be taken in and out through the lower opening of the engine room, and is fixed to the wall part of the space part by a locking tool when not in use. .

In the present invention, a space for inspection and maintenance of the engine room is utilized, and a ladder is stowed in the space from an opening provided on the lower side of the engine room so as to be able to enter and exit. When not in use, the ladder to be housed in the inner wall portion of the space is fixed with a lock so as not to hinder the operation during driving of the vehicle, and when in use, the under cover of the opening is opened to lock the ladder. When the ladder is released, the ladder can be used by leaning the ladder downward toward an arbitrary position where the ladder is pulled out and used. Therefore, according to the present invention, the ladder is in a free state at the time of use, so that the ladder can be used leaning on the working direction, and if the use location is determined in advance,
Ladder locking pieces are provided at those locations, and a part of the ladder is hooked on these locking pieces, so that it can be used more safely. When the ladder is not in use, the ladder is inserted into the space through the opening and locked by the locking device, so that the ladder can be stored using the inspection space and there is no hindrance to driving the vehicle. This has the effect of being able to be prepared at all times.

In the above invention, an insertion guide mechanism for receiving and holding an upper portion of the ladder is provided at an upper portion of a space where the ladder is stored in front of the storage wall, and a lower portion of the ladder stored at a lower portion of the front of the storage wall. It is preferable to provide an openable / closable locking tool for locking and fixing the lock. In this case,
When removing the ladder stored in the space inside the engine room in an upright position, release the ladder by pulling the ladder slightly forward, and then lower it down from the opening. Can be slid out without being guided by the insertion guide mechanism. Also, when storing, insert the top of the ladder inside the insertion guide mechanism and push it up as it is, the ladder can slide and fit in the storage position without falling down, the lower part is locked If it is fixed, it can be stored in a stable state by being held by the guide mechanism with the upper part inserted.
In this manner, a vehicle-mounted configuration having an effect that a ladder can be taken in and out by a simple handling operation can be provided.

In the above invention, a member for supporting the ladder is preferably provided around the opening at the lower part of the engine compartment. With this configuration, when performing a work such as an inspection in the engine room, the ladder can be directed and supported in a direction convenient for the work, and there is an effect that the work can be performed in a reasonable working posture. . Also,
It is preferable that a handrail for lifting is provided on the counterweight side in the space. By providing a handrail in the space as described above, when the worker moves up and down using a ladder in the space inside the engine room, when the body moves above the ladder, the handrail is gripped and a stable state is obtained. As a result, there is an effect that even a short ladder for in-vehicle use can be moved up and down in a reasonable posture and safety can be secured.

It is preferable that support means for attaching a ladder is provided at two or more places around the outside of the opening. In this case, if a ladder is carried in advance in a place other than the engine room where the inspection and maintenance work is to be performed, a supporting means such as a locking piece that can be held at an appropriate position in the upper part or the middle part is provided. This is convenient because the ladder that has been moved to the location can be safely supported and the operator can perform the intended work on the ladder.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a specific embodiment of a vehicle ladder supporting means of a hydraulic excavator according to the present invention will be described with reference to the drawings.

FIG. 1 is an external view of a hydraulic excavator provided with a vehicle ladder supporting means according to the present embodiment. FIG. 2 is a diagram showing a state in which the vehicle-mounted ladder according to the present embodiment is housed in the engine room space of the hydraulic shovel, (a) is a side view,
(B) represents a front view. FIG. 3 is a view showing one mode of use, FIG. 4 is a view showing a ladder support member provided in an opening in the lower part of the engine compartment, and FIG. 5 is a view showing a position of the opening in the lower part of the engine compartment. It is shown.

The vehicle ladder supporting means of this embodiment is provided with a large-sized hydraulic excavator 1 in which a cab 3 is provided at a front portion of an upper revolving structure 2, and an engine 6A and an engine 6A are provided at an upper portion projecting rearward. Other devices, a fuel tank, an oil tank, and the like (none of which are shown), and a counterweight 4 are mounted at the rear end. A work machine boom 5 is provided in front of the arm, and an arm 5a is provided at the tip of the boom 5.
The bucket 5b is attached via the. A mounting portion of the engine and the like is covered by a cover, and an engine room 6 is formed therein. Inside the engine room 6, a space 11 is formed between the engine 6A and the rearmost counterweight 4 so that one worker can enter for inspection.

The vehicle ladder support means 10 of the present embodiment.
The ladder 12 is stored in the space 11 in the engine compartment 6 when not in use, and is easily taken out when in use and the ladder 12 is supported at an arbitrary position to be used by an operator. It has been made possible.

The supporting means 10 for the vehicle ladder is provided on the lower surface of the revolving frame 2a and is located just above the opening 7 through which the engine room 6 can enter and exit.
At 1, the ladder 12 facing the counterweight 4 side
Is provided with an insertion guide mechanism 15 at an upper portion thereof, and a mounting portion of a locking tool 20 at a lower portion thereof.

The ladder 12 mounted on the vehicle has a length that can be accommodated in the engine room 6 and stands up with its lower end grounded on the ground surface G when used, and a hook attached to the upper part of the vertical members 12a, 12a. The pieces 12c, 12c are dimensioned to be engaged and supported by a support member provided near the opening 7. The ladder 12 is desirably lightweight so as to be easily handled, and is not particularly limited, but is preferably made of aluminum / aluminum alloy.

The insertion guide mechanism 15 is provided in the engine room 6
The base is attached to the exterior frame 8 which forms the skeleton, and the interval between the left and right vertical members 12a, 12a of the ladder 12 extending downward from the upper part with a distance in the depth direction capable of receiving and guiding the tip of the ladder 12 during storage. An upper guide member 16 having a narrower width and a vertically long guide piece 17 attached to the wall surface at a distance that is easy to slide when the ladder 12 is stored from a slightly lower position facing the upper guide member 16.

The lower locking member 20 is supported by the upper guide member 16 of the insertion guide mechanism 15 and is supported by the upper guide member 16 to form the lowermost tread surface of the ladder 12 standing upright.
2b is provided so as to be supported and fixed.
b, a presser foot 21 which can be detachably fixed by bolts, a fixing bolt 22 having a base end supported by a pin and rotatable up and down, a receiving member for receiving a wing nut 23 and a lower part of a ladder. 25. The presser foot 21 is formed by bending a relatively wide plate material into a shape for holding the horizontal member 12b of the ladder, and has its base end 21a attached to the front surface of the member 2b attached to the turning frame 2a. It is supported by a pin 21c above the receiving member 25, and has a structure in which it can be rotated vertically and gripped. In order to facilitate fixing by the fixing bolt 22 and the wing nut 23, a receiving portion of the fixing bolt 22 is formed in a cut hole 21b from the lower end in the lower front part.

On the other hand, a frame-like support member 27 is attached to the upper side of the inner edge of the opening 7 provided on the lower surface of the engine room 6. The ladder 12 can be supported by hooking a hook attached to the upper end of the ladder 12 to a position suitable for working with at least a half body in the ladder 6. Note that these support members 27 are provided so as not to be an obstacle when the operator gets into the space 11 in the engine room 6 from the opening 7.
Also, in order to prevent foreign matter from entering the opening 7 from outside during driving of the vehicle to damage the engine and the like,
An under cover 7a is attached, and is hinged at one edge so that it can be opened and closed. Therefore, ladder 12
The under cover 7a is opened when taking in and out. In addition, a handrail 26 is provided at an appropriate position in the engine room 6 on the counterweight 4 side with a required length in the vertical direction.

The support means 10 for a vehicle-mounted ladder constructed as described above releases the under cover 7a to open the opening 7 when performing inspection and maintenance near the engine 6A, thereby opening the space in the engine room 6. The ladder 12 housed in the portion 11 is taken out, and a hook 12c to be attached to the upper part of the ladder 12 is attached to the support member 2 provided on the upper peripheral edge of the opening 7.
If the lower end is grounded so as to be hooked on the ladder 7, the ladder 12 is stably supported as illustrated in FIG. 3, so that the ladder 12 allows the worker to put his body into the engine room 6 and perform work. Can be.

At this time, in order to take out the stored ladder 12, first, an operator dives below the upper revolving unit 2 at the rear thereof (in this type of large hydraulic excavator, the upper revolving unit 2 is moved from the ground G to the ground G). Since the height H to the lower surface is about 1500 mm, it can be squatted a little and can be sunk.)
Open the under cover 7a. Next, the ladder 1 stored in the opening 7 with the worker standing on the ground
Loosen the wing nut 23 of the locking member 20 that fixes the lower part of 2, release the fixing of the presser foot 21 by the fixing bolt 22, and turn the fixing bolt downward as it is, so that the presser foot 21 becomes free. Therefore, when the ladder is lifted upward, the horizontal member 12b of the ladder is opened. Therefore, when this operation is performed and the lower part of the vertical member 12a of the ladder is lowered at the same time, the upper part of the ladder 12 is moved to the upper guide member 16 of the insertion guide mechanism 15.
As a result, the vehicle can be lowered straight without falling forward. In addition,
During the lowering, if the operator pulls the lower part of the ladder 12 slightly to the near side, the leading end is guided by the guide piece 17 provided on the wall side and can be slid smoothly down.

Since the ladder 12 thus taken out is in a free state, the ladder 12 is selected in the direction of leaning in consideration of the situation of working in the space 11 which is a narrow space according to the working conditions, and the opening direction is selected. When the hook piece 12c is hooked on the support member 27 provided on the inner edge portion with the orientation set to one of the four sides of 7, the device can be used. Therefore, the worker climbs the ladder 12 and moves to the space 1
It only has to be within 1. At this time, if the ladder 12 is arranged in the direction as illustrated in FIG. 3, equipment (for example, maintenance of the alternator) on the rear surface side of the engine room 6 can be performed. When working without putting the whole body into the space 11, the ladder 12 is stably supported, so that the work can be performed with the ladder 12 resting on the intermediate tread. Also, when climbing the ladder, a handrail 26 is provided above,
By having this handrail 26, it is possible to move up and down while maintaining the balance. In addition, when the ladder 12 is arranged in the opposite direction to this example, there is no problem if the ladder 12 is moved up and down by supporting a part of the equipment installed in the engine room.

Next, the operation of storing the ladder 12 in the engine compartment 6 after the work is performed by holding the vertical members 12a, 12a of the freed ladder 12 with both hands, and the guide piece disposed on the storage side wall surface portion. The upper horizontal member 12b is brought into contact with 17 and is slid and pushed up. Then, the upper part of the ladder 12 is inserted inside the upper guide member 16, so that even if the hand holding the ladder is moved to the lower side, the ladder 12 can be lifted in a stable state without falling forward. Therefore, after the ladder 12 is pushed up to the uppermost part, the lower part is pressed against the front surface of the receiving member 25, and the presser foot 2 in a free state is pressed.
1 is held so as to cover the lowermost horizontal member 12b of the ladder, and a fixing bolt 22 is fitted into the cut-out hole 21b of the presser foot 21 and tightened with the attached wing nut 23. Is fixed at the bottom.

By doing so, the upper part of the ladder 12 is held by the upper guide member 6 of the insertion guide mechanism 15 in a state where the horizontal member 12b is sandwiched between the ladder 12 and the wall surface side, and the lower part is as described above. , So that it does not come off not only during traveling but also during work. In addition, even if the upper guide member 16 receives an external force that is swung in the horizontal direction by the turning, the upper guide member 16 can move the left and right vertical members 12a,
Since the ladder is held between the positions a, there is no danger that the upper part of the ladder will come off.

When the ladder 12 is removed from the storage location, the ladder 12 is in a free state as described above. Therefore, a metal fitting that allows the hook 12c to be engaged with an appropriate position of the outer cover or the counterweight 4 at the rear of the upper revolving unit 2 is provided. If attached in advance,
It can be moved to a place other than the inside of the engine room 6 as described above and used for required work.

Further, the locking member for fixing the lower portion when the ladder is stored is not limited to the above-described embodiment, and although not shown, a projection provided on the lever by rotating the lever is omitted. A lever lock type in which the piece sandwiches and fixes the lowest horizontal member of the ladder may be used. Further, as a means for holding the upper part of the ladder, a hook-shaped receiving piece having a deep receiving portion can be provided.

[Brief description of the drawings]

FIG. 1 is an external view of a hydraulic excavator provided with a vehicle-mounted ladder support means of the present embodiment.

FIG. 2 is a view showing a state in which the vehicle-mounted ladder according to the present embodiment is housed in an engine room space of a hydraulic shovel;
(A) shows a side view and (b) shows a front view.

FIG. 3 is a diagram showing one mode of use.

FIG. 4 is a view showing a ladder support member provided in an opening at a lower portion of an engine room.

FIG. 5 is a diagram showing the position of an opening in a lower part of an engine room.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic excavator 2 Upper revolving structure 2a Revolving frame 4 Counter weight 6 Engine room 7 Opening 8 Exterior cover frame 10 Means for supporting vehicle ladder 11 Space 12 Ladder 12a Vertical member of ladder 12b Ladder horizontal member 12c Hook 15 Insert Guide mechanism 16 Upper guide member 17 Guide piece 20 Locking tool 21 Presser foot 22 Fixing bolt 23 Wing nut 25 Receiving member 26 Handrail 27 Supporting member

Claims (5)

[Claims] A ladder is housed in a space formed between an engine mounting portion and a counterweight of a hydraulic shovel so as to be able to be taken in and out through a lower opening of an engine room, and a wall portion of the space when not in use. A vehicle ladder support means for a hydraulic excavator, wherein the ladder support means is fixed to the vehicle by a locking device. 2. An insertion guide mechanism for receiving and holding an upper portion of a ladder is provided at an upper portion of a space portion in which a ladder is stored in front of a storage wall, and a lower portion of the ladder to be stored is connected to a lower portion of the front surface of the storage wall. The vehicle-mounted ladder supporting means of the hydraulic excavator according to claim 1, further comprising an openable locking member for stopping and fixing. 3. The vehicle-mounted ladder supporting means of a hydraulic excavator according to claim 1, wherein a member for supporting the ladder is provided around an opening at a lower portion of the engine room. 4. The in-vehicle ladder supporting means of a hydraulic excavator according to claim 1, wherein a handrail for lifting and lowering is provided on the counterweight side in the space. 5. The vehicle-mounted ladder supporting means of a hydraulic excavator according to claim 1, wherein a supporting means for attaching a ladder is provided at two or more places around the outside of the opening.