JP2001123482A - Overturning time protective device for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an overturning time protective device for a construction machine for securing an operator cab inside space and visibility and reducing constitutive members. SOLUTION: In a construction machine having an operator cab, gate-shaped structures composed of erected one columns 7, 9, the other columns 8, 10 and single upper connecting bodies 11, 12 for connecting the upper ends of these columns are respectively arranged on left/right floor bodies inside of the operator cab, and a plate-like ceiling body 13 for connecting these structures are fixed to upper parts of these gate-shaped structures.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fall protection device (RO) for a construction machine which is mounted on a construction machine such as a wheel loader and protects an operator from being crushed when the construction machine falls.
PS).

[0002]

2. Description of the Related Art Construction machines such as wheel loaders often work on uneven terrain and are exposed to the danger of falling. Therefore, in order to protect an operator wearing a seat belt from being crushed when the machine falls, a fall protection device (ROPS: Roll-over protect) is provided.
active structures).

[0003] Regarding the ROPS, its ISO 3741 and JIS have been described in terms of testing and performance requirements.
A 8910 ". (Hereinafter RO
PS standard). Conventionally, in a hole loader or the like, a “4-post type R” as shown in FIG.
An “OPS” is provided in the cab.

[0004]

In the above-described four-post ROPS provided in the cab, the crossing body which crosses the ceiling surface of the cab to the left and right and the reinforcing member of the corner portion for reinforcing the crossing body are obstacles. As a result, the space inside the driver's cab becomes narrower, the appearance of the driver's cab deteriorates, and the field of view of the driver in the driver's cab becomes narrower. In addition, there is a problem that a manufacturing process is required due to a large number of constituent members, and the cost is increased.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems, and to provide a fall protection device for a construction machine in which a cabin space and a field of view are secured and the number of components is reduced.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a construction machine having an operator's cab in which two upright columns and an upper end of the columns are provided. A gate-shaped structure consisting of one upper connecting body to be connected is provided on each of the left and right floors inside the cab, and a plate-shaped ceiling body for connecting these is fixed to the upper part of these gate-shaped structures. It is characterized by having done.

According to the first aspect of the present invention, since there is no transverse body serving as an obstacle and the ceiling portion is constituted only by the ceiling member, the space inside the cab is widened, the appearance is good, and the driver's view is good. Become wider. Further, since the number of constituent members is small, the manufacturing process can be shortened, and the cost can be reduced.

According to a second aspect of the present invention, in a construction machine having an operator's cab, a portal-type structure comprising two standing columns and one upper connecting member connecting the upper ends of the columns is provided.
Provided on the left and right floors inside the operator's cab, respectively, a plate-like ceiling body connecting them is fixed to the upper part of these portal structures, and the ceiling body and the upper part of the left and right portal structures are fixed. A reinforcing body fixed to the upper connecting body is provided.

According to the second aspect of the invention, the strength of the ceiling can be increased without impairing the effect of the first aspect.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows a wheel loader provided with an embodiment of the apparatus of the present invention. In FIG. 1, 1 is a main body, 2 is a traveling wheel provided on the main body 1, and 3 is provided on the main body 1 so as to be capable of elevating. The arm 4 has a bucket rotatably provided at the tip of the arm 3, and 5 has an operator's cab provided on the main body 1. An operator rides in the operator's cab 5 to operate the wheel loader. The cab 5 is shown by a two-dot chain line in order to show a fall protection device 6 described later provided inside the cab 5. Reference numeral 6 denotes a fall protection device provided inside the cab 5 according to an embodiment of the device of the present invention.
9 and 10, upper connecting bodies 11 and 12, and a ceiling body 13.

FIG. 2 is an enlarged perspective view of the overturn protection device 6 showing an embodiment of the device of the present invention. In FIG. 2, the same reference numerals as those shown in FIG. 1 denote the same parts. Reference numeral 14 denotes a floor constituting the floor of the driver's cab.
Is a column standing on the floor 14 on the left front side inside the cab 5; 8 is a column standing on the floor 14 on the left rear side inside the cab 5; A column standing on the floor 14 on the inner right front side, 10 is a column standing on the floor 14 on the right rear side inside the operator's cab 5, 11 is an upper end of the column 7 and an upper end of the column 8 12 is a support 9
Upper connecting body for connecting the upper end of the support 10 and the upper end of the support 10,
Is a plate-shaped ceiling fixed on the columns 7, 8, 9, 10 and the upper connectors 11, 12. The ceiling body 13 can be shared with the ceiling member of the cab 5.

Next, the operation of the embodiment of the apparatus of the present invention will be described.

In the wheel loader shown in FIG. 1, an operator in a cab 5
By performing operations such as excavation, transportation and loading of earth and sand, and traveling for movement of the work site. These operations and traveling are often performed on uneven terrain, and there is a danger that the wheel loader will fall over. Is protected.

The overturn protection device 6 is constructed as shown in FIG. 2 and includes columns 7 and 8, an upper connecting body 11 and columns 9 and 1.
0 and the upper connecting body 12 respectively form a portal structure. The ceiling body 13 is fixed so as to connect the upper parts of the two portal structures, thereby obtaining the required strength.

According to the ROPS standard, the deflection of the structure satisfies the requirements for the lateral load and energy, the vertical load, and the longitudinal load defined by the type of the machine and its total mass. It is stipulated as follows. In this regulation, energy is determined besides the load only on the side, which means that the energy of the falling is absorbed by the bending of the component. In the structure of FIG.
In addition to satisfying the requirements for the loads in each direction, the energy can be effectively absorbed by flexing not only the columns 7, 8, 9, and 10 but also the ceiling body 13 against the lateral load.

FIG. 3 is a side view illustrating an embodiment of the device of the present invention, illustrating the bending of the members when the overturn protection device 6 receives a lateral load. This figure is a view of FIG. 2 as viewed from the front. The ceiling 13 bends in addition to the columns 7 to absorb the energy against the lateral load. In the figure, the portion denoted by DLV is a "deflection limit area (DLV)" defined by the ROPS standard, and it is stipulated that components of the ROPS and the side virtual ground (LSGP) must not enter the DLV. . By appropriately configuring the strength of the ceiling body 13 and the like, this rule can be satisfied.

As described above, the structure shown in FIG. 2, which is an embodiment of the apparatus of the present invention, can satisfy the regulations of ROPS, and has a cab interior space because the ceiling is constituted only by the ceiling body. , The appearance is good, and the driver's view is also wide. Further, since the number of constituent members is small, the manufacturing process can be shortened, and the cost can be reduced.

FIG. 4 is a perspective view showing another embodiment of the apparatus of the present invention. In FIG. 4, the same reference numerals as those shown in FIG. 2 denote the same parts. Reference numeral 15 denotes a reinforcing body for reinforcing the ceiling body, and the upper connecting bodies 11 and 12 and the ceiling body 13
Is fixedly provided.

According to the other embodiment, the strength of the ceiling can be increased without impairing the effects of the above-described embodiment by only slightly increasing the number of components.

[0020]

As described above, according to the present invention, a gate-shaped structure consisting of two standing columns and one upper connecting member connecting the upper ends of the columns is provided in the cab. Since the plate-shaped ceiling body that connects them to each other is provided on the inner left and right floors and fixed to the upper part of these portal structures, the protection device for the fall of the construction machine is constructed. Because it is composed only of the cab, the space inside the cab is widened, the appearance is good, and the driver's view is widened. Further, since the number of constituent members is small, the manufacturing process can be shortened, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a wheel loader provided with an embodiment of the device of the present invention.

FIG. 2 is an enlarged perspective view of a fall protection device showing an embodiment of the device of the present invention.

FIG. 3 is a side view illustrating the bending of the member when the overturn protection device according to the embodiment of the present invention receives a lateral load.

FIG. 4 is a perspective view showing another embodiment of the device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wheel loader 5 Operator's cab 6 Fall protection device 7 Support 8 Support 9 Support 10 Support 11 Upper connection body 12 Upper connection body 13 Ceiling body 14 Floor body 15 Reinforcement body

Claims (2)

[Claims] In a construction machine having an operator's cab, a gate-shaped structure consisting of two upright columns and one upper connecting body connecting the upper ends of the columns is provided on the left and right sides inside the operator's cab. A fall protection device for a construction machine, wherein a plate-shaped ceiling body for connecting these is fixed to an upper part of each of these portal structures, each being provided on a floor body. 2. In a construction machine having an operator's cab, a portal structure comprising two standing columns and one upper connecting body connecting the upper ends of the columns is provided on the left and right sides inside the operator's cab. A reinforcing plate is provided on each of the floor bodies, and a plate-shaped ceiling body for connecting these is fixed to the upper part of these portal structures, and is fixed to the ceiling body and an upper connection body on the upper part of the left and right portal structures. A fall protection device for a construction machine, comprising a body.