JPH0630252U - Front guard device for construction machinery - Google Patents

Abstract

(57) [Summary] [Purpose] The first purpose is to improve the weight and visibility of the card attached to the front of the operator's cab that protects the operator. The second purpose is to protect the front guard, especially This is to prevent the occurrence of cracks due to shock or vibration during operation of the mounting part. [Structure] For the first purpose, the front guard is made of a transparent synthetic resin plate, and for the second purpose, the upper side parts are pressed through stoppers without fixing the front guard to the front of the cab. This is achieved by abutting and supporting both sides of the lower part to the revo frame deck by a rubber mount structure.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is, for example, in a construction machine having a working machine in the front such as a hydraulic excavator, which is attached to the front of the cab front window, particularly in the case of breaker work and dismantling work, the front window caused by scattering of fragments and pebbles. Prevents damage to the operator's cab and relates to the operator's cab front guard device for construction machinery that protects the operator.

[0002]

[Prior art]

 FIG. 9 shows a hydraulic excavator. This machine has a lower traveling body a, and an upper revolving body b rotatably mounted on the upper portion of the traveling body a has a cab c, an engine, hydraulic equipment, and the like. It is equipped with a machine cap d and a counterweight e, which are installed internally, and a boom, an arm, and a bucket are jointly connected to the front part, and a working machine f that can be rocked by each hydraulic cylinder is provided. A front guard 1 as shown in FIG. 10 is attached to the front of the operator's cab c of the hydraulic excavator.

As shown in the figure, the conventional front guard 1 has a structure in which a frame frame 1a forming an outer edge portion and an iron round bar 1b are attached in a grid pattern, and a wire mesh 1c is further stretched over the entire surface. ing. Further, such front guards 1 are provided with front guard mounting brackets 3 on the left, right, and upper portions of the front of the operator's cab 2, respectively, and the handles 4 that engage with these brackets are provided on the front guard 1. The front guard 1 is attached to the front of the operator's cab 2 by projecting correspondingly to the upper and lower portions of the left and right frame frames 1a and screwing the mounting brackets 3 and the handles 4 with bolts 5.

[0004]

[Problems to be solved by the device]

 However, since the above-mentioned conventional front guard 1 is composed of an iron frame 1a, a round bar 1b attached in a grid pattern, and a wire mesh 1c, it is a considerable weight, and the cab is in operation. Since it is always tilted and displaced by vibration and impact, fixing this heavy object to the front of the operator's cab 2 at the left, right and up and down parts causes a problem that concentrated stress is generated in the mounting bracket 3 and cracks occur. Moreover, the strength of the driver's cab 2 also decreases because the weight of the front guard 1 is added. Therefore, it is increasingly attempted to strengthen the welded part of the mounting bracket 3 and increase the strength of the driver's seat 2. The weight of the cab 2 will increase.

The present invention has been made with the object of improving such a conventional problem. In addition to sufficiently securing the function as a front guard, it is possible to reduce the weight and reduce the load on the mounting bracket, which causes displacement of the cab. In addition, the lower part of the front guard is mounted on the Revo frame deck, and this mounting part has a rubber mount structure to respond to driver's cab displacement. I am going to try.

[0006]

[Means and Actions for Solving the Problems]

 In order to achieve the above object, the present invention provides the front guard according to claim 1 by a transparent synthetic resin plate made of reinforced plastic, which reduces the weight of the front guard and attaches it to the front of the cab. A front guard is provided to reduce the burden on the bracket portion to prevent stress concentration and cracks, and to improve visibility by making the front guard transparent to improve workability. Of the four mounting parts on the left and right, and the upper and lower parts of the front of the operator's cab of the guard, the upper left and right mounting parts are pressed against the front of the operator's cab via the stopper, and the lower left and right mounting parts mount the operator's cab. The front part of the Revo frame deck is supported by a rubber mount structure, which allows the front guard to be directly supported by the Revo frame deck without being fixed to the front of the cab. After unaffected by tilting displacement of the cab so that the vibration is absorbed by the lower rubber mount for shock.

[0007]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1 to 3 show the first embodiment, and FIGS. 4 to 8 show the second embodiment. First, in the first embodiment, reference numeral 11 shown in FIG. 1 is a front guard, which is made of a transparent synthetic resin plate made of reinforced plastic which is commercially available for industrial use, and has a sharp thickness and strength. Not only will there be no scratches or cracks when impacted by stones or debris from foreign objects, but it is also possible to withstand weather conditions such as direct sunlight or low temperatures, and at the same time the synthetic resin plate is transparent. It is made of wood. When the front guard 11 is attached to the driver's cab 2, as shown in detail in FIGS. 2 and 3, the mounting brackets 12 are projected on the left and right and upper and lower parts of the operator's cab front 2a by welding or the like. On the other hand, on the front guard 11, grips 13 are attached to the mounting brackets 12 by screws 14 respectively. The mounting brackets 12 and 14 are engaged with each other, and the mounting bolts are screwed. It is designed to be fixed by wearing clothes. Of course, the mounting brackets 12, 13 and the mounting members such as the screws, bolts 14, 15 are much lighter than the conventional steel weight guard because the front guard 11 is a synthetic resin plate. It is thin and simple.

Since the front guard is made of a transparent synthetic resin plate made of a reinforced plastic material as described above, the weight is lightened so that the front face of the operator's cab is not burdened with weight. No excessive stress is applied to the bracket. Furthermore, since there is no transparent steel guard or wire mesh to prevent the field of view from being constructed, the visibility is greatly improved and the location of the front guard is not noticed. It is needless to say that the mounting means such as the bracket of the front guard 11 shown in the present embodiment is not limited to the illustrated structure, and various suitable means can be appropriately adopted.

Next, a second embodiment will be described. FIG. 4 is a side view in which the front surface 21 of this embodiment is attached to the front surface of the operator's cab 2. In the figure, stoppers 22 are attached to the upper left and right sides of the front guard 21. The mounting structure is supported so as to be pressed against the operator's cab front surface 2a via the stopper 22, and the lower left and right sides are supported by brackets 24 on the deck piece 23a projecting from the front of the revoframe deck 23. Has become.

First, the stoppers 22 on both sides of the upper part of the front guard 21 are made of an elastic material or a synthetic resin material, and are fixed to the back surface of the guard 21 by means of an adhesive, pis, etc. The front face 2a of the cab is designed to be protected from damage such as scratches when it is subjected to vibration, impact, etc. while the guard 21 is pressed, and it is fitted to the right and left corners 2b of the front face to cause lateral vibration. In order to correspond to the above, it is formed in an angle shape as shown in FIG.

Next, as shown in FIGS. 6 and 7, supporting legs 21b projecting from the lower surface of the frame frame 21a of the guard 21 are attached to the upper surface of the revo frame piece 23a on both lower sides of the front guard 21. It is engaged with the bracket 24 and attached with a shaft pin 25. A cylindrical vibration-proof rubber 26 is inserted and fitted in the mounting shaft pin portion 25.

As described above, between the guards 21 near the toppers 22 on both upper sides of the front guard 21 attached to the operator's cab front surface 2a and between the operator's cab front surface 2a, and on both sides of the lower portion of the bracket 24, the guards 21 and the rev Tensile springs 27 and 28 are attached between the upper surfaces of the frame pieces 23a so that the front guard 21 constantly applies a pressing force to the front surface of the cab.

It should be noted that the front guard 21 is, as shown in FIG. 6, of course the same as the conventional one, which is made up of a heavy frame made of steel, a frame-shaped round bar, and a wire mesh. Alternatively, the transparent synthetic resin plate of the first embodiment may be used.

If one of the tension springs 27 and 28 of the upper and lower support portions of the front guard 21 is disengaged as shown in FIG. 8, the lower shaft pin 25 is used as a fulcrum to tilt forward. The front window of the driver's cab can be cleaned, and there is no need to remove it from the driver's cab as with conventional front guards.

Since the front guard 21 is not fixed to the operator's cab front 2a as described above in the second embodiment, not only the conventional mounting bracket is not required, but also the influence of the tilt displacement in the operation of the operator's cab. Since it does not receive the impact, problems such as cracks in the mounting part can be eliminated, and even if the front guard 21 is supported by the revo frame deck 23 and the front guard 21 is a heavy object, there is no problem, and the mount is made of anti-vibration rubber. Since it is a support structure, it absorbs vibrations and shocks, and the front guard is not damaged.

[0016]

[Effect of device]

 In the present invention, since the front guard is made of a transparent synthetic resin plate in the first embodiment, the weight of the front guard is greatly reduced, the mounting structure with the front part of the cab is simplified, and problems such as cracks are eliminated. Also, the weight burden on the driver's cab is reduced. In addition, the transparent front guard significantly improves visibility.

Further, unlike the second embodiment, the front guard is not fixed to the front portion of the operator's cab, but the support structure is used on the revoframe deck, so that the tilt displacement of the operator's cab during operation is irrespective of the weight of the front guard. Since it is not affected, cracks in the mounting part are also prevented, and vibration and shock are also absorbed by the rubber mount support structure, which can extend the life of the front guard. Further, the front support can be easily tilted with the lower support as a fulcrum, and the front window can be cleaned very easily.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a partially enlarged perspective view of a front guard mounting portion in FIG.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a side view showing a second embodiment of the present invention.

5 is a plan view of the stopper of FIG. 4 as viewed from P. FIG.

FIG. 6 is a partially enlarged perspective view of a lower part of the front guard of FIG.

7 is a cross-sectional view taken along line BB of FIG.

FIG. 8 is an operation diagram showing a front tilting state of the front guard of the present embodiment.

FIG. 9 is a schematic side view of a hydraulic excavator.

FIG. 10 is a perspective view showing a conventional front guard mounting structure.

[Explanation of symbols]

 1,11,21 Front guard 2 Operator's cab 2a Operator's cab front 3,12 Mounting bracket 4,13 Handle 22 Stopper 23 Revo frame deck 24 Bracket 26 Anti-vibration rubber 27,28 Tension spring

Claims (4)

[Scope of utility model registration request] 1. A cab front guard device for a construction machine, wherein the guard is attached to a front portion of a cab, and the guard is made of a transparent synthetic resin plate. 2. A guard attached to a front part of a driver's cab, which is pressed against and abuts on the front part of the driver's cab through upper and lower stoppers of the guard, and has both lower parts on the upper surface of the revo frame deck with rubber. A cab front guard device for construction machinery, which is characterized by being supported by a mount structure. 3. The construction machine according to claim 2, wherein tension springs are mounted between the guard and the front of the operator's cab near the stoppers on both sides of the upper part of the front guard and near the mounting parts of the revo frame decks on both sides of the lower part. Driver's cab front guard device. 4. The construction machine according to claim 2, wherein the tension guards attached to the upper and lower sides are removed to allow the front guard to tilt forward with the shaft pin of the lower rubber mount as a fulcrum. Driver's cab front guard device.