JP2002088812A - Cab for construction machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the productivity and reduce the manufacturing cost by easily forming a front pillar and a roof pillar at a low cost. SOLUTION: Lateral front pillars 22 and 23 and roof pillars 26 and 27 are constituted of one hollow steel pipe having a circular section and working the steel pipe by drawing as a substantially U-shaped sectional deformed steel pipe having roller grooves 22A and 23A integrally molded thereon. Accordingly, since the manufacture of a pipe material having a complicated sectional shape as in prior arts is dispensed with, and the set up of a separate roller groove is also dispensed with, the front pillars 22 and 22 and the roof pillars 26 and 27 can be easily formed at a low cost to improve the productivity of a cab 11, and the manufacturing cost can be also reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cab for a construction machine suitably used for a hydraulic shovel, a hydraulic crane, and the like.

[0002]

2. Description of the Related Art In general, a hydraulic excavator as a construction machine is provided with a lower traveling body, an upper revolving body rotatably mounted on the lower traveling body, and an elevating / removing front part of the upper revolving body. And a working device. In addition, a cab as an operator's cab in which an operator gets on is provided on a frame of the upper swing body.

The cab for a hydraulic excavator is formed using a hollow structure formed by abutting an inner panel and an outer panel, for example, and joining the two panels using welding means in this state. However, in order to form this hollow structure, it is necessary to press many types of panel materials and perform many welding operations, so that workability is reduced and manufacturing costs are increased.

Therefore, there is a cab formed by using a pipe material instead of a panel material, and the cab according to the prior art is disclosed in, for example, JP-A-10-100945 and JP-A-5-100945.
Japanese Patent Application Laid-Open Nos. 193529 and 9-1150756.

A cab according to the prior art is composed of a base frame formed of a frame, left and right front pillars located in front of the base frame at left and right corners, and the base frame. Left behind,
The vehicle is generally constituted by left and right rear pillars arranged in a right corner portion, and left and right roof pillars connecting upper portions of the front pillar and the rear pillar in front and rear directions. The left and right front pillars and rear pillars have their upper sides connected to the left and right by a connecting frame or the like.

[0006] Some cabs for hydraulic excavators have a front window that can be opened and closed in accordance with the work situation on the front side. This front window is always located between the left and right front pillars and covers the front,
When lifted up and opened, it is housed between the left and right roof pillars. Therefore, for example, rollers are provided at four corners of the front window, and roller grooves for guiding the rollers of the front window between the front side and the top side are formed in the front pillar and the roof pillar.

[0007]

However, in the above-mentioned cabs for construction machines according to the prior art, it is necessary to produce pipe materials having a complicated cross-sectional shape. Therefore, it is costly to produce these pipe materials. There is a problem of bulkiness.

In a cab having a front window that can be opened and closed, a roller groove or the like must be formed in a pipe material used for a front pillar or a roof pillar, or a roller groove must be attached as a separate member. However, there is a problem that the performance is lowered and the manufacturing cost is increased.

The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to form a front pillar and a roof pillar easily and inexpensively, thereby improving productivity and reducing manufacturing costs. A cab for a construction machine is provided.

[0010]

According to the first aspect of the present invention, there is provided a cab for a construction machine comprising: a base frame formed of a frame;
Left and right front pillars located at the left and right corners located in front of the base frame, and left and right front pillars located at the left and right corners located behind the base frame. A left and right roof pillar connecting the front pillar and the upper part of the rear pillar forward and rearward; a front connecting frame connecting the upper sides of the left and right front pillars left and right; And a front window provided to be openable and closable between the left and right front pillars and the roof pillar.

Then, in order to solve the above-mentioned problem,
The feature of the configuration adopted by the invention of claim 1 is that each front pillar and roof pillar are formed by processing a hollow steel pipe as a deformed steel pipe having a roller groove for guiding a roller provided on the front window. It is in.

With this configuration, a roller groove can be formed when a hollow steel pipe having a generally circular cross section is processed as a deformed steel pipe. Therefore, the front pipe can be formed simply by appropriately bending the deformed steel pipe. Pillars and roof pillars can be easily formed.

According to a second aspect of the present invention, the roller groove is formed substantially parallel to the longitudinal direction with respect to the outer surfaces of the front pillar and the roof pillar.

With this configuration, the deformed steel pipe formed by drawing or the like, for example, has a uniform roller groove position with respect to the outer surface even after being subjected to bending. Steel pipes can be used for front pillars and roof pillars. Further, by forming the roller groove substantially parallel to the outer surface of the pillar, the appearance can be improved.

According to a third aspect of the present invention, the deformed steel pipe has a structure in which a roller groove parallel to the length direction is integrally formed by drawing a hollow circular steel pipe.

With this configuration, a normal steel pipe having a circular cross section is used, and the steel pipe is subjected to a drawing process, whereby a roller groove parallel to the length direction is integrally formed. Can be formed.

According to the fourth aspect of the present invention, a connecting member is provided between the front pillar and the roof pillar so as to be fitted to the upper end of the front pillar and the front end of the roof pillar to connect the two. A roller groove that is continuous with the roller groove of the pillar or the roof pillar is provided.

[0018] With this configuration, the upper end of the front pillar is fitted to one end of the connecting member and fixed by welding means or the like, and the front end of the roof pillar is fitted to the other end of the connecting member by welding means. By fixing by
The front pillar and the roof pillar can be easily connected by the front connecting member.

According to the fifth aspect of the present invention, a center pillar for connecting the base frame and the roof pillar is provided at one of the left and right directions of the base frame at an intermediate position between the front and rear directions. There is an openable door between the front pillar.

With such a configuration, the strength of the base frame, the roof pillar, and the like can be increased by the center pillar, and the center pillar can be provided so that the door can be opened and closed.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a case where a cab for construction equipment according to an embodiment of the present invention is applied to a hydraulic shovel will be described in detail with reference to FIGS.

Reference numeral 1 denotes a lower traveling body of a hydraulic shovel, and 2 denotes an upper revolving body which is mounted on the lower traveling body 1 so as to be capable of revolving. A working device 3 for performing the operation is provided so as to be able to move up and down.

The upper revolving unit 2 includes a revolving frame 4
A cab 11 mounted on the front left side of the revolving frame 4 and an exterior cover provided on the revolving frame 4 from the right side to the rear side of the cab 11 as shown in FIGS. 5, a counterweight 6 attached to the rear end of the revolving frame 4, and a counterweight 6 mounted on the revolving frame 4 at the rear side and extending leftward and rightward on the revolving frame 4. It is roughly constituted by an engine 7 and the like.

Reference numeral 11 denotes a cab mounted on the front left side of the revolving frame 4. The cab 11 defines a driver's cab in which an operator gets in, and has a driver's seat and various levers (all shown in FIG. 1). (Not shown). And
The cab 11, as shown in FIGS. 4 to 8, includes a cab frame 12, a front window 38, a door 39,
Rear panel 41, side panel 43, roof panel 4
4, a front glass 45, a rear glass 46, a left side glass 47, a right side glass 48, and the like.

Numeral 12 denotes a cab frame which forms a frame structure of the cab 11, and the cab frame 12 is provided with the cab frame 12 shown in FIGS.
As shown in FIG. 0, a base frame 13, front pillars 22, 23, rear pillars 24, 25, roof pillars 26, 27, front connecting members 28, 29, rear connecting members 30, 31, front connecting frame 32, rear connecting frame described later. 33, a center pillar 35 and the like. In addition, for the detailed shapes of the front pillar, rear pillar, roof pillar, front connecting member, and rear connecting member that are symmetrical left and right, the members arranged on the right side are enlarged and illustrated, and the reference numerals of the left side members are shown in parentheses. It is described in.

Reference numeral 13 denotes a base frame which forms a base of the cab 11. As shown in FIG. 11, the base frame 13 is disposed at each of the front left side, the front right side, the rear left side, and the rear right side. Mounting bases 14, 15,
16, 17 and the respective mounting bases 14, 15, 16, 17
The left and right vertical frames 18 and 19 connecting the spaces and the front and rear horizontal frames 20 and 21 are formed in a frame shape.

Here, the front mounting bases 14, 15 are
It is formed by plate bodies 14A and 15A formed in a substantially triangular shape, and fitting projections 14B and 15B having a convex sectional shape projecting upward from the plate bodies 14A and 15A. On the other hand, the rear mounting bases 16 and 17 include plate members 16A and 17A formed in a substantially triangular shape, and the plate members 16A and 17A.
Fitting protrusion 16B having a semicircular cross section projecting upward from
17B.

Reference numeral 22 denotes a left front pillar which is located at the front side of the base frame 13 and is disposed at the left corner.
Indicates right front pillars located on the right side of the base frame 13 at the front side, and the left front pillar 22 and the right front pillar 23 have a substantially rectangular shape toward the front as shown in FIG. And a roller groove 22 for guiding a roller 38C of a front window 38, which will be described later, on a surface which becomes inside in the left and right directions when assembled.
A and 23A are integrally formed.

Here, the left front pillar 22 and the right front pillar 23 use a single hollow steel pipe having a circular cross section, and the steel pipe is subjected to drawing, for example, by passing between a plurality of rollers. Is formed as a deformed steel pipe having a substantially U-shaped cross section in which the roller grooves 22A and 23A are integrally formed. As described above, since the roller grooves 22A and 23A are formed in the deformed steel pipe in advance,
The front pillar 2
2 and 23, the roller grooves 22A and 23A
Can be arranged at fixed positions with respect to the outer surfaces of the left front pillar 22 and the right front pillar 23. Accordingly, the roller grooves 22A and 23A can be formed substantially parallel to the outer surfaces of the pillars 22 and 23 in the length direction.

Each of the front pillars 22 and 23 has
Mounting holes 22B and 23B are provided at an intermediate portion in the length direction. As shown in FIGS. 7 and 8, stoppers 22C and 23C made of separate members are attached to the attachment holes 22B and 23B to determine the end point position when the front window 38 is closed.

The left front pillar 2 configured as described above
2 is a fitting projection 14 of the left front mounting base 14
B and is fixed by welding means in this state. The lower end of the right front pillar 23 is fitted to the fitting projection 15B of the right front mounting base 15, and is fixed by welding means in this state.

On the other hand, reference numeral 24 denotes a left rear pillar, which is located at the rear side of the base frame 13 and is disposed at the left corner.
Reference numeral 5 denotes a right rear pillar located on the right side of the base frame 13 at the rear side. The rear pillars 24 and 25 are gently bent so that the lower side is shifted forward with respect to the upper side. Formed, front pillar 2
As in the case of the pipes 2 and 23, each pipe is constituted by one deformed steel pipe. The lower end of the left rear pillar 24 is fitted to the fitting projection 16B of the left rear mounting base 16, and is fixed by welding means in this state. The lower end of the right rear pillar 25 is fitted to the fitting projection 17B of the right rear mounting base 17, and is fixed by welding means in this state.

Reference numeral 26 denotes a left roof pillar extending forward and rearward above the left front pillar 22 and the left rear pillar 24, and 27 denotes a right front pillar 23 and a right rear pillar 2.
5 shows a right roof pillar extending in the front and rear directions, respectively, and the left roof pillar 26 and the right roof pillar 27 are gently moved so that the middle part in the length direction projects upward as shown in FIG. It is curved. The left roof pillar 26 and the right roof pillar 27 have front windows 3 on their inner surfaces in the left and right directions when assembled.
The roller grooves 26A and 27A for guiding the eight rollers 38C are integrally formed.

Here, as the left roof pillar 26 and the right roof pillar 27, a deformed steel pipe similar to the above-described left front pillar 22 and right front pillar 23 is used, and both are formed by bending a single deformed steel pipe. It is formed by doing. Therefore, each roof pillar 26, 27
The roller grooves 26A and 27A are formed by bending a deformed steel pipe in which the roller grooves 26A and 27A are integrally formed in advance, similarly to the front pillars 22 and 23.
A and 27A are formed substantially parallel to the outer surface other than the inner surface in the length direction.

The left roof pillar 26 has a front end attached to an upper end of the left front pillar 22 via a left front connecting member 28 described later, and a rear end connected to a left rear pillar via a left rear connecting member 30 described later. 24 is attached to the upper end. On the other hand, the right roof pillar 27 has a front end mounted on an upper end of the right front pillar 23 via a right front connecting member 29 described later, and a rear end mounted on an upper end of the right rear pillar 25 via a right rear connecting member 31 described later. Mounted on the part.

Reference numeral 28 denotes a left front connecting member provided between the left front pillar 22 and the left roof pillar 26;
Indicates a right front connecting member provided between the right front pillar 23 and the right roof pillar 27, and the left front connecting member 28 and the right front connecting member 29 are in the form of a rectangular cylinder curved in an arc shape. . The left front connecting member 28 and the right front connecting member 29 are formed, for example, by fixing a plurality of panel members press-formed into a predetermined shape by welding means.

As shown in FIG. 14, the left front connecting member 28 has a roller groove 22A of the left front pillar 22 and a roller groove of the left roof pillar 26 on the inner side in the left and right directions when assembled. A roller groove 28A that is continuous with the groove 26A is formed, and a fitting portion 28B and a fitting portion 28C are formed at one end and the other end in the length direction. on the other hand,
In the right front connecting member 29, a roller groove 29A continuous with the roller groove 23A of the right front pillar 23 and the roller groove 27A of the right roof pillar 27
A is formed, and a fitting portion 2 is provided at one end and the other end in the length direction.
9B and a fitting portion 29C are formed.

The left front connecting member 28 has a fitting part 28B on one end side fitted to the upper end of the left front pillar 22 and fixed by welding means, and a fitting part 28C on the other end side of the left roof pillar 26. The left front pillar 22 and the left roof pillar 26 can be connected by being fitted to the front end and fixed by welding means. On the other hand, the right front connecting member 29 fits the fitting portion 29B on one end side to the upper end of the right front pillar 23 and is fixed by welding means.
The right front pillar 23 and the right roof pillar 27 can be connected by fitting the fitting part 29C on the other end side to the front end of the right roof pillar 27 and fixing it by welding means.

Next, reference numeral 30 denotes a left rear connecting member provided between the left rear pillar 24 and the left roof pillar 26, and reference numeral 31 denotes a right rear connecting member provided between the right rear pillar 25 and the right roof pillar 27, respectively. The left rear connecting member 30 and the right rear connecting member 31 are formed in a hollow box shape. The left rear connecting member 30 and the right rear connecting member 31 are formed, for example, by fixing a plurality of panel members pressed into a predetermined shape by welding means.

Here, the left rear connecting member 30 has
As shown in the figure, the fitting portion 30A and the fitting portion 3 are provided on the front side and the lower side.
0B is formed. On the other hand, a fitting portion 31A and a fitting portion 31B are formed on the right rear connecting member 31 on the front side and the lower side.

The left rear connecting member 30 has the front fitting part 30A fitted to the rear end of the left roof pillar 26 and fixed by welding means, and the lower fitting part 30B to the upper end of the left rear pillar 24. And fixed by welding means, the left rear pillar 24 and the left roof pillar 26 can be connected. On the other hand, the right rear connecting member 31
Are fitted to the rear end of the right roof pillar 27 by a fitting portion 31A on the front side and fixed by welding means.
By fitting 1B to the upper end of the right rear pillar 25 and fixing it by welding means, the right rear pillar 25 and the right roof pillar 27 can be connected.

Reference numeral 32 denotes a front connecting frame (shown in FIG. 10) provided on the front upper side of the cab frame 12.
The front connection frame 32 is formed of a long plate extending in the left and right directions, and is bent in a U-shape in the length direction. And the front connection frame 32
Are the left and right front connecting members 2
The upper portions of the front pillars 22 and 23 are connected to the left and right via the front connecting members 28 and 29 by welding means.

Reference numeral 33 denotes a rear connecting frame provided on the rear upper side of the cab frame 12.
Has a long rectangular tube shape extending in the left and right directions, for example, by fixing a plurality of panel members by welding means. The rear connecting frame 33 has attachment portions at both ends fixed to the left and right rear connecting members 30 and 31 by welding means.
The upper side of each rear pillar 24, 25 is left through 0, 31,
Connected to the right.

Reference numeral 34 denotes another connecting frame which is located at the rear of the cab frame 12 and is spaced apart below the rear connecting frame 33. The connecting frame 34 has a cross-section of a plate extending in the left and right directions. It is formed in a rod shape by bending it into a U-shape. The connecting frame 34 has both ends fixed to the upper and lower intermediate portions of the left and right rear pillars 24 and 25 by welding means, thereby connecting the intermediate portions of the respective rear pillars 24 and 25 to the left and right directions. are doing.

Numeral 35 is a center pillar provided on the left side of the cab frame 12, and the center pillar 35 is used to fix an inner panel 36 and an outer panel 37 which are pressed into a substantially L-shape by welding means. To form a hollow plate. Also, the center pillar 35
Are pillar portions 35A extending upward and downward, and side panel portions 35B extending rearward from the lower side of the pillar portions 35A.
It consists of

The center pillar 35 thus configured
The lower end of the pillar portion 35A and the side panel portion 35B are fixed to the left vertical frame 18 of the base frame 13 by welding means, and the upper end of the pillar portion 35A The part is fixed to the left roof pillar 26 by welding means.

Reference numeral 38 denotes a front window provided on the front side of the cab frame 12.
As shown in FIGS. 7, 8, and 10, a rectangular wind frame 38A extending upward and downward, a windshield 38B fixed to the wind frame 38A so as to cover the front side thereof, Four rollers 38C, 38C,... (Only two are shown) provided at the corners of the frame 38A, and provided at the upper part of the window frame 38A, lock the front window 38 in the closed position and the open position. And a locking device 38D.

In the front window 38, the left rollers 38C, 38C are movably engaged with the roller groove 22A of the left front pillar 22, the roller groove 26A of the left roof pillar 26, and the roller groove 28A of the left front connecting member 28. The right rollers 38C, 38C are the roller grooves 23A of the right front pillar 23, the roller grooves 27A of the right roof pillar 27, and the roller grooves 29 of the right front connecting member 29.
A is movably engaged with A. As a result, the front window 38 is normally arranged between the left and right front pillars 22 and 23 as shown in FIG. 7 and covers the front side. On the other hand, when the lock device 38D is released and lifted upward and opened, as shown in FIG. 8, the lock device 38D is accommodated between the left and right roof pillars 26 and 27, that is, below the roof panel 44 described later.

Reference numeral 39 denotes a door provided between the center pillar 35 and the left front pillar 22.
As shown in FIG.
It is hinged so that it can be opened and closed via 40.

Reference numeral 41 denotes a rear panel made of a metal plate provided over the left and right rear pillars 24 and 25 so as to cover the rear side of the cab frame 12. Reference numeral 42 denotes a left rear pillar 24.
The corner panel 43 is provided to cover the right side of the cab frame 12. The side panel 43 is formed of a metal plate fixed to the vertical frame 19, the right front pillar 23, and the right rear pillar 25. The roof panels made of metal plates fixed to the right roof pillars 26 and 27, the front connection frame 32, and the rear connection frame 33 are shown, respectively.

Reference numeral 45 denotes a lower side of the front window 38 and the horizontal frame 20 and the left and right front pillars 2.
The lower windshield mounted on the left and right rear pillars 24 and 25 is located between the rear connecting frame 33 and the rear panel 41, and the lower windshield 46 is located between the rear connecting frame 33 and the rear panel 41. A left side glass 48 provided between the panel 42 and the right side glass 48 is provided between the right front pillar 23 and the right rear pillar 25.

The hydraulic shovel according to the present embodiment has the above-described configuration. Next, the operation of the hydraulic shovel will be described.

First, at a work site or the like, an operator operates the traveling lever in the cab 11 to tilt the lower traveling body 1 forward and backward, for example. When excavation work or the like of earth and sand is performed, the working device is operated by tilting the working lever, or the upper swing body 2 is swung.

Next, a procedure for assembling the cab 11 will be described. First, the front pillars 22, 2 are attached to the mounting bases 14, 15, 16, 17 of the base frame 13.
3. Attach the lower ends of the rear pillars 24, 25. next,
Front connecting members 28 and 29 and rear connecting member 3 are provided at upper end portions of front pillars 22 and 23 and rear pillars 24 and 25, respectively.
The roof pillars 26 and 27 are mounted via 0 and 31.
Then, the front connecting members 28 and 29 are connected by the front connecting frame 32, and the rear connecting members 30 and 31 are connected by the rear connecting frame 33. Further, the vertical frame 18 of the base frame 13 and the left roof pillar 26
The cab frame 12 is assembled by attaching the center pillar 35 to the cab frame 12.

After the cab frame 12 is assembled in this manner, the front window 3
8, door 39, rear panel 41, corner panel 42, side panel 43, roof panel 44, windshield 4
5. The cab 11 can be assembled by sequentially attaching the rear glass 46, the left side glass 47, the right side glass 48, and the like.

Thus, according to the present embodiment, the left and right front pillars 22, 23 and the roof pillars 26, 27
Is made by drawing a normal hollow steel pipe having a circular cross section and processing the hollow steel pipe as a deformed steel pipe having a substantially U-shaped cross section in which roller grooves 22A and 23A are integrally formed. Thereby, there is no need to manufacture a pipe material having a complicated cross-sectional shape as in the prior art,
Further, since there is no need to separately install a roller groove, the front pillars 22 and 23 and the roof pillars 26 and 27 can be easily and inexpensively formed. As a result, it is possible to manufacture the components of the cab 11 at low cost, improve the productivity when producing the cab 11, and reduce the manufacturing cost.

Further, the front pillars 22, 23 and the roof pillars 26, 27 are formed of a deformed steel pipe using a drawing process, so that the front pillars 22, 23,
Even when the roof pillars 26 and 27 are curved, the roller grooves 22A, 23A, 26A and 27A are
2, 23 and the outer surfaces of the roof pillars 26, 27 can be formed substantially parallel to the length direction. Thus, the appearance of the front pillars 22 and 23 and the roof pillars 26 and 27 can be improved.

Further, between the front pillars 22 and 23 and the roof pillars 26 and 27, the front pillar 2
Front connecting members 28 and 29 are fitted to the upper ends of the roof pillars 26 and 27 and connected to the front ends of the roof pillars 26 and 27 to connect the front pillars 26 and 27 to each other, and the rear pillars 24 and 25 are provided between the rear pillars 24 and 25 and the roof pillars 26 and 27. The rear connecting members 30 and 31 are provided so as to be fitted to the upper end of the roof pillars and the rear ends of the roof pillars 26 and 27 so as to connect the two members. Therefore, these members can be easily fixed by fixing each member using welding means. Can be connected to each other, and assembling workability can be improved.

In the embodiment, the front pillar 2
An example is given in which the roof pillars 26 and 27 are connected via front connection members 28 and 29 and the rear pillars 24 and 25 and the roof pillars 26 and 27 are connected via rear connection members 30 and 31. Although described, the present invention is not limited to this, for example, a front pillar and a roof pillar,
The rear pillar and the roof pillar may be directly fixed and connected by welding means or the like.

In the embodiment, the front pillar 2
Although the roof pillars 26 and 27 and the roof pillars 26 and 27 have been described as being formed using the same deformed steel pipe, the present invention is not limited to this. May be configured.

Further, in the embodiment, the cab 11 of a hydraulic shovel has been described as an example of the cab for construction equipment. However, the present invention is not limited to this, and the cab for other construction equipment such as a hydraulic crane may be applied. Can be applied.

[0062]

As described in detail above, according to the first aspect of the present invention, each of the front pillars and the roof pillars has a hollow steel pipe formed with a roller groove for guiding a roller provided on the front window. Therefore, a roller groove can be formed when a hollow steel pipe having a generally circular cross section is processed as a deformed steel pipe. As a result, it is possible to easily form the front pillars and the roof pillars only by appropriately performing bending or the like on the deformed steel pipe, thereby improving the productivity in producing the cab and reducing the manufacturing cost. it can.

According to the second aspect of the present invention, since the roller grooves are formed substantially parallel to the outer surfaces of the front pillar and the roof pillar in the length direction, for example, the deformed steel pipe formed by drawing or the like cannot be bent. Since the position of the roller groove with respect to the outer surface becomes constant even after processing, this type of deformed steel pipe can be used for the front pillar and the roof pillar. Further, by forming the roller groove substantially parallel to the outer surface of the pillar, the appearance can be improved.

According to the third aspect of the present invention, since the deformed steel pipe is formed by integrally forming a roller groove parallel to the longitudinal direction by drawing a hollow circular steel pipe, the cross-sectional shape becomes circular. By using a normal steel pipe and performing a drawing process on the steel pipe, a deformed steel pipe in which roller grooves are integrally formed can be formed, and front pillars and roof pillars can be manufactured at low cost.

According to the fourth aspect of the present invention, a connecting member is provided between the front pillar and the roof pillar so as to be fitted to the upper end of the front pillar and the front end of the roof pillar to connect them. Since the roller groove continuous with the roller groove of the pillar and the roof pillar is provided, the upper end of the front pillar is fitted to one end of the connecting member and fixed by welding means or the like, and the front end of the roof pillar is fixed to the other end of the connecting member. By fitting and fixing by welding means or the like, the front pillar and the roof pillar can be easily connected by the front connecting member, and the assembling workability can be improved.

According to the fifth aspect of the present invention, a center pillar for connecting the base frame and the roof pillar is provided at one of the left and right directions of the base frame at an intermediate position between the front and rear directions. Since the door that can be opened and closed is provided between the front pillar and the center pillar, the strength of the base frame, the roof pillar, and the like can be increased by the center pillar, and the door can be opened and closed on the center pillar.

[Brief description of the drawings]

FIG. 1 is a front view showing a hydraulic shovel applied to an embodiment of the present invention.

FIG. 2 is an enlarged left side view of the excavator in a state in which a working device is omitted.

FIG. 3 is a plan view of the excavator shown in FIG. 2;

FIG. 4 is an enlarged front view showing a cab in FIG. 1;

FIG. 5 is a left side view of the cab shown in FIG.

FIG. 6 is a rear view of the cab shown in FIG.

FIG. 7 is a cross-sectional view of the cab as viewed from a direction indicated by arrows VII-VII in FIG. 5;

FIG. 8 is a sectional view showing the cab with the front window opened, as viewed from the same position as in FIG. 7;

FIG. 9 is an external perspective view showing a cab frame.

FIG. 10 is an exploded perspective view showing a cab frame.

FIG. 11 is an external perspective view showing the base frame as a single unit in an enlarged manner.

FIG. 12 is an external perspective view showing the front pillar by itself in an enlarged manner.

FIG. 13 is an exploded perspective view showing the roof pillar and the front connecting member in an exploded state in an enlarged manner.

FIG. 14 is an enlarged view of a main part, in which a front pillar, a roof pillar, a front connecting member, and a rear connecting member are disassembled and enlarged.

[Explanation of symbols]

11 Cab 13 Base frame 22 Left front pillar 22A, 23A, 26A, 27A, 28A, 29A Roller groove 23 Right front pillar 24 Left rear pillar 25 Right rear pillar 26 Left roof pillar 27 Right roof pillar 28 Left front connecting member 29 Right front connecting member 30 Left Rear connecting member 31 Right rear connecting member 32 Front connecting frame 33 Rear connecting frame 35 Center pillar 38 Front window 38C Roller 39 Door

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazunori Komatsu 650 Kandate-cho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. F term in Fujisawa factory (reference) 2D015 EA03 3D003 AA11 BB14 CA32 DA17 DA18 3F205 AA05 AA20 BA01 KA10

Claims (5)

[Claims] 1. A base frame made of a frame-shaped body, left and right front pillars located in front of the base frame and arranged in left and right corners, and a rear frame located in a rear side of the base frame. Left and right rear pillars arranged at the left and right corners, and left and right roof pillars connecting the front pillar and the upper portion of the rear pillar forward and rearward,
A front connection frame connecting the upper sides of the left and right front pillars in the left and right directions, a rear connection frame connecting the upper sides of the left and right rear pillars in the left and right directions, and a left and right front pillar and a roof pillar; A cab for a construction machine having a front window that can be opened and closed between the front pillar and the roof pillar, wherein each of the front pillar and the roof pillar is formed with a roller groove for guiding a hollow steel pipe to a roller provided in the front window. A cab for construction machinery characterized by being formed as a deformed steel pipe. 2. The method according to claim 1, wherein the roller groove is provided in the front pillar,
The cab for a construction machine according to claim 1, wherein the cab is formed substantially parallel to a longitudinal direction of the outer surface of the roof pillar. 3. The cab for a construction machine according to claim 1, wherein the deformed steel pipe has a configuration in which the roller groove parallel to the longitudinal direction is integrally formed by drawing a hollow circular steel pipe. 4. A connecting member is provided between the front pillar and the roof pillar, the connecting member being fitted to an upper end of the front pillar and a front end of the roof pillar and connecting the front pillar and the roof pillar. The cab for a construction machine according to claim 1, wherein a continuous roller groove is provided in the roller groove. 5. A center pillar for connecting the base frame and the roof pillar at an intermediate position in the front and rear directions is provided on one side of the base frame in the left and right directions, and the center pillar and one of the front pillars are connected to each other. The cab for a construction machine according to claim 1, 2, 3, 3 or 4, further comprising a door that can be opened and closed between the cabs.