JP2001049696A - Cab of construction machine and construction machine equipped therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cab structure in which a sliding door does not overhang to the outside from the maxmum revolving radius when opening or closing it and enlarges the effective space of the cab as much as possible and further, it can be smoothly opened or closed and also provide a construction machine equipped with the cab. SOLUTION: A revolving base is provided on a lower traveling body. The external side face 10 is installed at a position deviating from the revolving center of the base and is formed of a curved face bulging out and a sliding door is provided in the external side face 10. In this case, the radius R2 of curvature of the rear half of the external side face 10 is set smaller than the radius R1 of curvature of the front half, and the sliding door 16 is opened or closed along the external side face 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cab of a construction machine such as a hydraulic shovel or a crane truck, and a construction machine provided with the cab.

[0002]

2. Description of the Related Art As this kind of construction machine, as disclosed in, for example, Japanese Utility Model Registration No. 2526933, a swivel is installed on a traveling body having wheels, crawler tracks, and the like, and an excavator is mounted on the swivel. A working device such as a device and a crane device and a power device thereof, and a cab for starting / stopping the working device and maneuvering the traveling body are provided. The cab is miniaturized to avoid interference with the working device during the work and to fit within the movement trajectory, but at the same time, slide the cab entrance to secure comfortable living and effective space. To be opened and closed by the door, the outer side surface portion including the sliding door in a circular arc surface of a radius close to the maximum turning radius of the turntable, or as a position that fits inside the crawler belt,
The slide door has the same arc shape as the outer side surface portion, and is slid along the arc surface.

In addition, a window is provided on the front surface of the cab. The cab is particularly widened through the front window to improve the operability by increasing the field of view in the front and upper direction. In order to avoid interference with the front part, the upper part of the front part is formed so as to be inclined backward as it goes upward.

[0004] By the way, if pillars provided at the four corners of the cab stand upright and parallel to each other, even if the outer side surface of the cab is formed in an arc shape along the outer diameter of the turntable as described above. However, the pillars can be formed to have the same thickness vertically. However,
As described above, when the upper portion of the front window portion of the cab is formed to be inclined backward, if the outer side portion is formed as a single arc, that is, as a part of a cylindrical body, the front window portion and the outer side portion are formed. The front pillar, which stands upright so that it is vertical when viewed from the front, is gradually increased in width from side to side in the side view from the starting point to the upper end of the front window according to the angle of inclination of the front window. The field of view above the front outside of the cab is extremely narrowed. Therefore, in the above-mentioned Utility Model Registration No. 2526933,
Almost the front side of the outer side is inclined inward toward the top, and the left and right widths of the front pillar are made uniform when viewed from the front, so as to balance the entire body.

In the cab disclosed in Japanese Patent No. 272,055, for example, the curvature of the front half of the outer side surface of the cab has the same radius of curvature in the vertical direction, and all arcs are formed in the outer side surface. Formed as a three-dimensional curved surface obtained by moving the center point backward as it goes upward so as to intersect at the boundary line between the first half and the second half, and adjust the lateral width of the side surface of the pillar up and down The view in the direction above does not change to ensure visibility above the front outside of the cab.

According to the publication, a door sliding surface in a door opening of a cab is formed by a lower arc having the same center as a turning center of a turntable from a lower end of a pillar at a lower end of the door opening. , From the lower end of the door opening to the maximum position of the cab width, and at the same time, connect the outer lower end of the rear end surface of the cab to the lower end of the door opening from the intersection of the rear end surface with the lower arc. The center of the basic arc is displaced rearward from the lower end of the door opening to the upper end of the door opening in accordance with the rearward inclination of the front window portion. The outer side surface behind the door opening and reaching the rear end of the cab is formed as the same cylindrical surface composed of the basic arc connecting the rear end of the door opening to the rear end of the cab. .

[0007] With this configuration, in the cab for construction machinery disclosed in the above-mentioned patent publication, the cab front window portion has the same width vertically and the upper portion thereof is inclined backward, while maximizing the cab width. An excellent appearance from the front of the cab is obtained, the manufacture is easy, and the door stopper provided at the rear end of the cabin does not have to protrude from the swivel.

[0008]

However, according to the cab for construction machinery disclosed in the above-mentioned patent publication, the door opening on the outer side surface of the cab is formed in a three-dimensional curved surface as described above. The rear outer side surface from the rear end of the door opening to the rear end of the cab is formed as a cylindrical surface. The three-dimensional curved surface of the door opening and the cylindrical surface of the rear outer side surface are formed in a shape along basic arcs having the same radius as each other in plan view as described above. The three-dimensional curved surface side has a shape along an arc whose center point is moved backward from the center of the cylindrical surface of the rear outer side surface portion.

The arc formed by the three-dimensional curved surface whose center point has been moved while keeping the same radius dimension, intersects the cylindrical surface of the rear outside side surface at the rear end point of the door opening at an intersection angle. The intersection angle becomes smaller in accordance with the amount of movement of the center point. As a result, along the rear end of the door opening, a smooth continuous surface between the three-dimensional curved surface and the cylindrical surface of the rear outer side surface portion is not obtained, and the shape becomes a polygonal line shape in a plan view, thereby. , The beauty of the side part is impaired.

The basic arc at the lower end of the door closing portion is inscribed in the lower arc passing through the lower end of the front outer pillar. Therefore, the cylindrical surface of the rear outer side surface portion is, for example, a cylindrical shape along the lower arc, and the center point is moved rearward according to each height position on the outer side edge constituting the door opening, and the rear end is By sequentially obtaining an arc inscribed in the lower arc to form a three-dimensional curved surface, the three-dimensional curved surface and the cylindrical surface of the rear outer side surface portion smoothly continue from the inner contact point as a boundary It becomes possible to make it into a shape.

However, in any case, the overall shape of the slide door must have a similar shape along the outer side surface of the cab having at least a partly three-dimensional curved surface as described above. Therefore, the sliding door also has a three-dimensional curved shape part and a cylindrical part. When the sliding door is opened and closed, especially when the opening of the entrance is opened by the sliding door, the inner surface of the three-dimensional curved surface part is formed by the cab. I have to ride on the rear outer side surface and lift the entire door outward from the rear outer side surface. As a result, it is necessary to calculate the floating amount and arrange the outer side surface portion of the cab largely inside from the outer diameter of the swivel base, and accordingly, the cabin width becomes narrower.

An object of the present invention is to increase the effective space in the cab chamber as much as possible while preventing the sliding door from protruding outward from the maximum turning radius of the swivel table when the sliding door is opened and closed. An object of the present invention is to provide a cab structure that can be opened and closed smoothly and a construction machine having the cab installed.

[0013]

This object is achieved by the first to fourth aspects of the cab according to the first to fourth aspects and the fifth aspect of the construction machine according to the fifth aspect. The cab of the first invention is provided with a swivel on a lower traveling body, is installed at a position deviated from the center of rotation of the swivel, has an outer side surface portion formed with a curved surface bulging outward, and In a cab of a construction machine having a sliding door in a portion, a radius of curvature of a rear half of the outer side surface is set to be smaller than a radius of curvature of a front half thereof.

Now, the entire curved surface area of the outer side surface of the cab is constituted by a part of a cylindrical body having the same radius of curvature, and the rear end of the outer side surface is defined by the rear half of the region near the periphery of the turntable. When the cab is installed so as to come inside, when the sliding door is opened as described above, the rear end of the sliding door protrudes outward from the turning radius of the turntable. In order to avoid this, a guide roller located in the center of the rear edge of the sliding door,
If the cab is engaged with a guide rail disposed at the rear half of the outer side surface of the cab so as not to protrude outward, the front edge of the slide door protrudes outward.

Therefore, usually, when the slide door is opened, the interior volume of the front part of the driver's seat is ensured, and the rear end of the cab is installed with sufficient margin so that the rear end does not protrude from the turning radius of the turntable. Is set. As a result, the width of the cabin, especially behind the seat portion of the cab, becomes extremely narrow, often giving a great sense of oppression to the operator.

On the other hand, in the first aspect of the present invention, the radius of curvature at the rear half of the outer side surface of the cab is set smaller than that at the front half, and the rear end installation position of the outer side surface of the cab is set to the thickness of the door. Only when the slide door is open, the rear end of the slide door is actively guided along the rear half of the outer side with a small radius of curvature, and at the same time, the front edge of the slide door is positioned on the outer side. By actively guiding along the surface, even when the door is open, the rear end of the cab can be maximized without projecting its rear end outward from the turning radius of the swivel. . That is, instead of minimizing the volume of the rear half of the cab, the front half of the cab, in which the driver substantially experiences the width of the cab, in other words, the volume in front of the driver is maximized. The radius of curvature of the rear half may be constant, or may be gradually reduced from the front to the rear of the rear half.

In the second aspect of the present invention, in the first aspect of the invention, the front window portion is formed on an inclined surface which is inclined rearward in a side view, and extends rearward from an outer edge of the front window portion. A three-dimensional curved surface in which at least the upper region of the front half of the outer side surface portion has an arc-shaped cross section orthogonal to the vertical line, and gradually curves upward and inwardly toward the front inclined edge. The sliding door has a curved surface that is substantially the same as the front half of the outer side surface portion, and a curved region of the rear half of the outer side surface portion is an arc surface that is continuous with the curved region of the front half portion. It is characterized by being formed in.

The three-dimensional curved surface, for example, gradually displaces the center position backward as an arc having the same radius of curvature goes upward, and positions the rear end of the three-dimensional curved surface on the same vertical line. Alternatively, the radius of curvature of the arc is gradually reduced upward, and the rear end of the three-dimensional curved surface is set to be located on the same vertical line. Also,
The generatrix of the cylinder formed by the arc surface may be a curve.

In the present invention, the case where the front window portion of the cab is formed as an inclined surface which is inclined rearward from below to above is defined, and in this case, the curved shape of the outer side surface portion of the cab is specified. Is composed of a part of a simple cylindrical body, as described above, the pillar provided between the front window portion and the outer side surface has a wider side surface width as going upward, so that a diagonally upward view for the worker is provided. It will be greatly hindered.

Therefore, in the second aspect of the present invention, the front window portion is formed on the rear inclined surface, and at least the front half of the outer side surface portion following the rear inclined surface has the above-described three-dimensional curved surface shape. At this time, the latter half of the outer side surface portion is formed as a curved surface that is smoothly continuous with the three-dimensional curved surface with a vertically extending boundary line interposed therebetween. The curved surface area in the rear half portion may be constituted by, for example, a part of a single cylindrical body, but has the same radius of curvature smaller than the radius of curvature of the lower end of the front half portion while smoothly continuing to the three-dimensional curved surface. Then, the center can be gradually moved forward to form an inclined surface which is inclined upward toward the inside of the turntable as a whole.

With this configuration, the side surfaces of the pillar can be made uniform in the vertical direction, so that the field of view obliquely upward can be widened, and the left and right edges of the cab can be made parallel in front view. The appearance can be ensured. In addition, the radius of curvature of the rear half portion is made smaller than the radius of curvature of the front half portion of the cab, and the front end of the three-dimensional curved surface region that is inclined upward and inside the cab is deformed as vertically as possible. This not only makes it possible to maximize the interior of the cab as in the first aspect of the invention, but also prevents the sliding door from protruding outward from the maximum turning radius of the turntable when the sliding door is opened. Enable.

According to the third aspect of the present invention, for example, by deforming the front end of the above-mentioned three-dimensional curved surface area inclined inwardly of the cab in an upward direction into a vertical line, the outer side surface portion is made to slide by the slide. The sliding door has a guide means for deforming and guiding the three-dimensional curved surface shape of the sliding door to become a two-dimensional curved shape, that is, a part of a single cylindrical body, when the door opening / closing opening operation is performed.

If the three-dimensional curved surface is formed on the sliding surface of the sliding door, the front edge of the three-dimensional curved surface rides on the rear half of the outer side surface when the door is opened, and particularly the front of the door. An attempt is made to protrude the lower edge and / or the upper edge of the trailing edge more outwardly than when the sliding door has a two-dimensional curved surface. In the present invention, since the radius of curvature of the rear half of the outer side surface is set to be smaller than that of the front half as described above, the amount of overhang is particularly large.

Therefore, in the third aspect of the present invention, a guide means for positively deforming the three-dimensional curved surface into a two-dimensional curved surface when the slide door having the three-dimensional curved surface is opened is provided on the outer side surface portion. . The guide means at the time of opening and closing the slide door is composed of a rolling roller normally provided on the door side and a guide rail provided on the outer side surface of the cab.
The rolling rollers are installed at three locations, generally at two locations at the top and bottom edges of the front edge of the sliding door and at one location at the center of the rear edge of the sliding door. The rolling position of the moving roller relative to the door body is unchanged, and in particular, it is impossible to increase the distance between the rolling roller and the door body during rolling. On the other hand, the guide rail provided on the outer side surface of the cab can forcibly guide the rolling roller during rolling.

Therefore, in the third invention, for example, the guide trajectory of the guide rail with respect to the rolling roller provided at the upper end of the front edge of the slide door is formed so as to be gradually pushed outward, and the lower end of the front edge of the slide door is formed. The guide trajectory of the guide rail with respect to the provided rolling roller is formed to be drawn inward. On the other hand, the rolling roller provided at the center of the rear end edge of the slide door is restrained and guided by a guide rail provided along an arc having a smaller radius of curvature than the front half of the outer side surface.

That is, when the slide door is opened,
While pushing the front edge upper end of the door positively outward,
The front edge lower edge of the door is positively pulled inward, and at the same time, the center of the rear edge of the door is guided along the surface of the rear half of the outer side surface. As a result, the sliding door having a three-dimensional curved surface is deformed into a two-dimensional curved surface, and the door is opened along the surface of the outer side surface of the cab. The sliding surface of the door extends entirely along the rear surface of the outer side surface, and the lower end of the front edge and / or the upper end of the rear edge of the door fall within the maximum turning radius of the swivel.

[0027] The fourth aspect of the present invention is directed to a front window having an inclined surface which is installed at a position deviated from the center of rotation of the swivel table and which is inclined rearward in a side view, and an outer edge of the front window. An outer side surface that extends rearward and has a curved surface that has a curved surface that bulges outward in its entire cross section perpendicular to the vertical line, and that has a required width from the upper edge to the lower edge in the curved surface region in the front half thereof. Part, in the cab of the construction machine comprising a slide door for opening and closing the entrance, the curved region of the front half of the outer side surface portion extending rearward from the outer edge of the inclined surface, The cross-sectional shape perpendicular to the vertical line is an arc shape, and is formed in a three-dimensional curved surface shape whose curvature radius gradually decreases upward, and the sliding door has a curved surface substantially the same as the front half of the outer side surface portion. A rear half of the outer side surface The curved region has the same curvature over the top and bottom, and is formed on an arc surface that is continuous with the curved region of the first half, and the radius of curvature is set to be substantially the same as the radius of curvature at the lower end of the three-dimensional curved surface region. Have been
The outer side surface portion is provided with guide means for deforming and guiding the slide door so that the three-dimensional curved surface shape becomes a two-dimensional curved shape when the slide door is opened / closed.

The third aspect of the present invention is that the radius of curvature in the second half of the outer side surface is set to be substantially the same as the radius of curvature at the lower end of the three-dimensional curved surface region in the first half. Is different from Also in this invention, the curved surface of the rear half of the outer side surface portion can be formed in a part of a single cylindrical body, as in the second invention, but the cab of the cab moves upward along the curved surface. It may be configured to be slightly inclined inward.

In the fourth aspect of the present invention, the amount of overhang of the rear end of the sliding door when the sliding door is opened is smaller than that of the third aspect of the invention, but it is still the same. The amount of protrusion of the lower end of the front end edge is not different from that of the third invention. Therefore,
By deforming the front three-dimensional curved surface of the sliding door into a two-dimensional curved surface as in the third invention, the rear end of the sliding door projects outward from the turning radius of the turntable even when the door is opened. Never do.

According to the fifth aspect of the present invention, a swivel is provided on the undercarriage, is installed at a position deviated from the center of rotation of the swivel, and an outer side surface is formed with a curved surface bulging outward. 4. A construction machine provided with a cab according to any one of claims 1 to 3 having a slide door on an outer side surface portion, wherein the installation position of the cab is such that the outer lower end of the front edge of the cab is substantially swiveled of the swivel base. The sliding door is characterized in that the lower end of the front edge and / or the upper end of the trailing edge of the sliding door when the entrance is opened are set to substantially the maximum turning radius of the swivel.

By adopting such a configuration, the rear end of the sliding door does not protrude outward from the turning radius when the sliding door is opened and closed as described above, and the door can be smoothly opened and closed. Can maximize the space in the cab compartment, that is, the space in front and side of the driver

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, typical embodiments of the present invention will be specifically described with reference to the drawings. FIG. 1 shows a hydraulic excavator as a construction machine according to the present embodiment. The excavator is mounted on a traveling body 1 on a swivel 2.
A cab 3 and an engine room 4 are provided on the swivel 2, and a working machine 5 is attached.
The work machine 5 includes a boom 5a whose base end is pivotally supported on the center of rotation of the swivel table 2, an arm 5b pivotally supported at the tip of the boom 5a, and a bucket pivotally supported at the tip of the arm 5b. 5c and the like. The cab 3 is installed so as to be biased to the right of the working machine 5 on the swivel 2 in a front view.

The cab 3 is formed in a substantially rectangular parallelepiped box shape as shown in FIGS. 2 and 3, and its front surface 6 has a vertical surface 6a which rises almost vertically from the lower end to a height of about 1/3.
And an inclined surface 6b that rises from the upper end of the vertical surface 6a to the top plate portion 7 so as to incline rearward. A plate glass or a transparent resin plate is fitted into the vertical surface 6a and the inclined surface 6b, respectively. Therefore, the front part 6 has a substantially rectangular shape in a side view. In addition, the left inner side surface portion 8 in a front view
The rear surface portion 9 is formed of a vertical plane, and a plate glass or a transparent resin plate is fitted into an upper half surface of each panel or a smaller area. The reason why the front portion 6 is inclined rearward is to ensure an upward view and to avoid interference between the work implement 5 and the cab 3.

On the other hand, the front part 6 and the rear part 9 are viewed from the front.
The outer side surface portion 10 connecting between the outer edges is a curved surface bulging outward. According to the present embodiment, the intermediate pillar 11 is erected at a position approximately two-thirds of the front-rear width from the front end of the lower end of the outer side surface portion 10, and the front pillar 12
An opening 14 for operator entry / exit is formed between the rear end of the intermediate pillar 11 and the front end of the intermediate pillar 11, and constitutes the first half of the present invention. A glass plate or a transparent resin plate is fitted in the upper half of the panel between the intermediate pillar 11 and the rear pillar 13, and an intermediate guide rail 15 of a horizontally extending slide door 16 is formed below the upper half. Have been.

In the present embodiment, the front half of the cab outer side surface portion 10 is constituted by a single cylindrical surface region 10b from the lower end of the opening portion 14 to a height of about 1/3. The remaining upper approximately 2/3 is a three-dimensional curved surface area 10a.
It consists of. The rear half of the cab outer side surface portion 10 is formed of a two-dimensional curved region 21 that smoothly continues to the cylindrical surface region 10b and the three-dimensional curved region 10a. FIG. 4 schematically shows a three-dimensional view and a top view of the cab for explaining the shape of the outer side surface portion 10. In the figure, for the sake of easy understanding, the entire front half of the outer side surface portion 10 is formed in the arc (front-back) direction in the three-dimensional curved surface region 10.
a, the vertical surface 6 of the cylindrical surface region 10 b and the front surface 6.
Although illustration of “a” is omitted, it goes without saying that the effects of the present invention can be obtained even in the embodiment shown in FIGS. 2 and 3 having such a configuration. Hereinafter, the shape of the outer side surface portion 10 will be specifically described based on FIG.

The three-dimensional curved area 10a and the two-dimensional curved area 21 are separated by a vertical boundary line a1 in a side view. This boundary line a1 is on the line segment a in a top view. When the driver sits in the cab driver seat (not shown), the driver's elbow is positioned near the line segment a. The lower end of the front edge of the three-dimensional curved area 10a is located on the second substantially maximum turning radius, and the front end of the three-dimensional curved area 10a extends from the lower end of the front edge of the cab 3 in front view. Standing diagonally backward so as not to overhang.

The radius of curvature is gradually reduced from the lower end toward the upper end from the lower end to the upper end in accordance with the inclination (the radius of curvature changes from the lower-end radius of curvature R1 to the upper-end radius of curvature Rn). The trailing edge is the boundary line a
1 has a three-dimensional curved form in which the two-dimensional curved surface area 21 is smoothly connected with an arc having a radius of curvature R2 inscribed in the two-dimensional curved surface area 21. Although the boundary line a1 is a substantially vertical line in the present embodiment, the boundary line a1 is inclined inward above the cab 3 for explanation in FIG. Here, in the illustrated cab shape, in the relationship of R1>Rn> R2, in order to make the outer side surface portion 10 of the cab 3 smoothly continuous from front to back, an arc having a curvature radius R1 at the lower end of the front half portion, the upper end thereof. The centers O1, On, and O2 of the arc having the curvature radius Rn and the arc having the curvature radius R2 in the rear half are on the line segment a, and the rear edge of the front half and the front end of the rear half on the boundary line a1. The edge is designed to be inscribed in an arc having a radius of curvature R1 at the lower end of the front half.

The effects of the above-described configuration in the first half of the outer side surface portion 10 are as follows. First, the lower end of the front edge of the three-dimensional curved area 10 a, that is, the lower end of the front edge of the cab 3 is located on the maximum turning radius of the turntable 2. This is, for example, the above-mentioned prior art, Japanese Patent No. 272205.
As compared with the case where the lower end of the cab is located at a position smaller than the maximum turning radius of the swivel base as disclosed in Japanese Patent Application Publication No. 5 (1994), it can be seen that the cab 3 is within the turning radius of the swivel base 2 with respect to the front part 6. Assuming that a larger front surface area can be secured. This immediately increases front visibility,
This leads to an improvement in driver comfort as the cab inner volume increases. In addition, the front end of the three-dimensional curved surface area 10a is directed from the lower end to the upper end, and the front pillar 12 is connected to the front end.
Is raised rearward so as not to protrude outside of the cab 3 in a front view, thereby improving the aesthetic appearance in a front view.

Further, the front end of the outer side surface portion 10 shown in FIG. 4, that is, the front end of the three-dimensional curved surface region 10a is inclined toward the inside of the cab as it goes upward, while the boundary line a1, ie, The rear end of the three-dimensional curved surface region 10a is substantially vertical (in FIG. 4 (a), the inclination is slightly inclined toward the inside of the cab as the boundary line a1 is raised as described above. In the cab in which the outer side surface portion 10 is shaped like a cylinder, when the front pillar is balanced so as not to protrude outside the cab in a front view,
As described in the aforementioned Japanese Utility Model Registration No. 2526933, it was necessary to incline the upper side of the outer side surface part inward. Further, when the cab is equipped with a sliding door, the sliding door has a cylindrical shape or a shape similar to a cylinder for opening and closing the sliding door. As a result, it is necessary to incline the outer side surface at least on the entire surface on which the slide door slides.

In comparison with this prior art, in the present invention,
Since the inclination toward the inside of the cab above the three-dimensional curved region 10a is gradually reduced from the front end to the rear end, the inside of the cab can be visually recognized particularly when the driver is sitting in the driver's seat inside the cab. Since the volume inside the cab is increased, driving comfort is improved. However, if the above-described configuration of the outer side surface portion 10 is adopted, the front edge lower end or the rear edge upper end of the slide door greatly protrudes outside the cab 3 when opening and closing the slide door, so that the cab 3 turns when the slide door is opened. There is a problem that it does not fit within the radius. The solution to this problem will be described later.

On the other hand, the rear half portion of the outer side surface portion 10 via the boundary line a1 is constituted by a single cylindrical surface having the same radius of curvature R2 over and under the cab 3. As described above, the radius of curvature R2 is set smaller than the radius of curvature R1 of the cylindrical surface region 10a in the front half part, and inscribes the front half of the outer side surface part 10 via the boundary line a1. In the present embodiment, the rear half portion is constituted by a single cylindrical surface having the same radius of curvature R2. However, the rear half portion is moved forward, for example, as the center of an arc having the same radius of curvature R2 moves upward. And the upper end edge may be slightly inclined inside the cab 3.

The intermediate pillars 11 extend from the front ends of the upper and lower horizontal rails 17 and 18 disposed at the upper and lower ends of the outer side surface portion 10.
, Vertical guide rails 19 and 20 for guiding the opening and closing operation of the slide door 16 are provided. The specific structure of these guide rail portions 15, 19, 20 will be described later in detail.

In the above embodiment of the cab 3, the form of the slide door 16 also has the same curved surface form as the front half of the outer side surface 10 of the cab 3. That is, at a height 1/3 from the lower end of the slide door 16, the slide door 16 is constituted by a part of a cylindrical body having an arc surface parallel to an arc surface having a radius of curvature R 1, and the upper end has an upper edge formed into an arc having a radius of curvature Rn. It has a three-dimensional curved surface shape in which the radius of curvature is gradually reduced upward so as to form a parallel arc.

Rollers are attached to the upper and lower ends of the front edge of the sliding door 16 and the center in the vertical direction of the rear edge, respectively. The sliding door 16 is opened and closed while being supported and guided by upper, middle, and lower guide rails 19, 15, and 20 provided in the slidable door. The support structure of the sliding door by the rollers and the guide rails 15, 19, 20 in the present embodiment will be specifically described with reference to FIGS. 5 and 6 while comparing with a conventional sliding door support structure. FIG. 5 shows a support structure of the slide door 16 according to the present embodiment, and FIG. 6 shows a support structure of a conventional slide door 16 '.

First, an example of a conventional support structure of the slide door 16 'will be specifically described with reference to FIG. 6. FIG. 6A shows the upper end of the slide door 16' with respect to the outer side surface 10 'of the cab 3'. The upper support rail 17 'has an upper guide rail 19' at the lower end thereof. The upper guide rail portion 19 'has a rectangular cross section, and its outer lower end corner is largely missing.
9'a. An inverted concave upper guide rail 19'b is fixed to the ceiling 19'a-1 along the upper edge 14'a of the opening 14 '. On the other hand, the upper portion of the front edge of the slide door 16 'has a bracket 16'a projecting substantially horizontally from the inner surface toward the outer side surface portion 10' of the cab 3 '. An upper guide roller 16'b which fits on the upper guide rail 19'b and rotates about a substantially vertical axis is mounted.

FIG. 6 (b) shows an intermediate slide door support structure. The support structure of the slide door 16 'is the same as the above-described slide door 16 support structure of the present embodiment, and the cab 3'. An intermediate guide rail portion 15 'formed in the rear half of the outer side surface portion 10', and an intermediate guide roller 1 rotatably fitted to the intermediate guide rail portion 15 '.
6'c. The intermediate guide rail portion 15 'is formed with a concave groove portion 15'a formed in the center of the rear half of the outer side surface portion 10' in the front-rear direction and a U-shaped cross-section fixed along the bottom surface of the concave groove portion 15'a. Intermediate guide rail 15 '
b. One intermediate guide roller 16 '
c is pivotally supported by a bracket 16'd projecting horizontally from the rear end center of the slide door 16 'toward the cab 3' so as to be rotatable around a vertical axis and swingable in the front-rear direction.

FIG. 6C shows the sliding door 1 at the lower end.
6A shows a lower support structure 6 ', which extends from the lower front end of the outer side surface 10' of the cab 3 'to the intermediate pillar 1'.
Lower guide rail portion 20 'extending to the lower front end of 1'
And first and second lower guide rollers 16'e and 16'f which are attached to the lower part of the front end of the slide door 16 'and are rotatably fitted to the lower guide rail portion 20'.
The lower guide rail portion 20 'is a groove-shaped guide rail 2 extending to the intermediate pillar 11' on the back surface of the floor surface of the cab 3 '.
0'a, and a rolling surface forming member 20'b having an L-shaped cross section which is vertically provided on the back surface of the floor surface.

The first and second lower guide rollers 16'e, 16'f are attached to the lower front end of the slide door 16 ', and project laterally toward the cab 3'. The lower shaft 16'g is rotatably supported on the distal end of the lower bracket 16'g such that the rolling axis is perpendicular to the lower bracket 16'g. A first lower guide roller 16'e rolling about a vertical axis is rotatably fitted to the groove-shaped guide rail 20'a, and the second lower guide roller rolling about a horizontal axis. 16'f is rotatably mounted on the roller rolling surface 20'b-1 of the rolling surface forming member 20'b having an L-shaped cross section.

The conventional support structure of the slide door 16 'is as described above. The upper support structure of the slide door 16' is a horizontal rail in which the upper guide roller 16'b is simply disposed at the upper end of the panel of the outer side surface portion 10 '. The intermediate support roller 16'c is fixed to the outer side surface portion 10 'only by being fitted from below into a guide rail 19'b having a cross section fixed at 17' and having an inverted concave shape. ′ Is fitted from the side to a guide rail 15 ′ formed horizontally on the rear half of the panel, and is guided by rolling. And the sliding door 16 '
As for the lower support structure, the first lower guide roller 16'e, which rolls around a vertical axis, is rolled and guided in the groove-shaped guide rail 20'a, and rolls about a horizontal axis. The second lower guide roller 16'f is provided with a roller rolling surface 20'b of the rolling surface forming member 20'b having an L-shaped cross section.
1 and a rolling guide.

As described above, even in the conventional slide door 16 ', each of the guide rollers 1 provided at three points of the upper front end, the lower front end, and the center of the rear edge of the slide door 16'.
6'b, 16'c and 16'e;16'f are guide rails 19'b extending along the upper and lower edges of the front half, the front half lower edge and the rear half of the cab 3 ', respectively. , 1
5 'and 20'a and the roller rolling surface 20'b-1 are supported and guided to slide.

Here, as shown in FIG. 4 (a), the front window of the cab 3 is supposed to be inclined rearward, and
Assuming that the upper part is formed as a three-dimensional curved surface as described above, the upper edge and the lower edge of the front half of the cab 3 are in a plan view shown in FIG. The upper edge draws an arc of a small radius of curvature from its front end to the rear end, and the lower edge draws an arc of a radius of curvature larger than the radius of curvature of the upper edge from its front end to the rear end. At the rear end, they merge almost on the boundary line a1, and thereafter, the cab 3 'is connected to the arc of the rear half.

In this case, the upper, middle, and lower guide rails 1 are used.
9'b, 15 ', 20'a and upper middle guide roller 16'
b, 16'c, the first lower guide roller 16'e, and the second lower guide roller 1 rolling on the roller rolling surface 20'b-1.
The guide trajectory 6'f indicates that the intermediate guide roll 16'c moves along the curved surface of the rear half of the outer side surface portion 10 '.
The upper guide roller 16'b guided to the rear end of the cab 3 'and entering the inside of the cab 3' is guided along the small arc to the vicinity of the boundary line a1, thereby deforming the slide door 16 '. Instead, if the first lower guide roller 16'e at the lower end disposed on the outermost side of the cab 3 'is guided to the above-mentioned boundary line a1, as shown by a broken line in FIG. The lower end of the front edge of ′ largely protrudes outward.

Therefore, when the slide door 16 'is opened, if the lower end of the front edge of the slide door 16' is to be set within the turning radius of the turntable (not shown), the slide door 16 'is not moved.
Outer side surface portion 1 of the cab 3 'by the amount of protrusion of the lower end of the front edge of
The curvature of the curved surface must be determined so that 0 'falls within the turning radius, and the interior volume of the cab 3' is reduced. This has nothing to do with whether or not the radius of curvature of the rear half of the outer side surface portion 10 'is the same as that of the front half.

On the other hand, the support structure of the slide door 16 according to the embodiment of the present invention solves the above-mentioned problem, and furthermore, the rear half of the outer side surface portion 10 which is a characteristic part of the first invention of the present invention. By adopting a structure in which the radius of curvature of the portion is smaller than that of the first half and minimizing the amount of protrusion of the slide door 16 to the outside, the lateral width of the cab 3 is maximized within the turning radius of the swivel 2. , And at the same time, a function of enabling a smooth opening and closing operation of the slide door 16 is exhibited.

FIG. 5 shows a sliding door 16 according to this embodiment.
The first example of the support structure is greatly different from the conventional support structure in that the conventional support structure mounts the slide door 16 'on the lower guide rail portion 20 provided at the lower end of the cab 3' as described above. In contrast to this, the support structure according to the present embodiment employs a suspension system in which the entire slide door 16 is suspended and supported on the upper guide rail portion 19, and another difference is that The guide trajectory of the upper guide roller in the upper guide rail portion is pushed out along an arc having a curvature radius R1 substantially the same as the arc of the curvature radius R1 along the lower end edge of the cab 3, and the first guide rail in the lower guide rail portion is pushed. The point that the guide trajectory of the lower guide roller is drawn to the cab 3 side so as to follow the same arc as the arc along the lower end edge of the cab 3, and the conventional guide roller has a simple cylindrical shape The a, in the present support structure lies in that all the guide rollers and barrel shape.

This will be specifically described with reference to FIG.
The guide roller 1 at an intermediate position including an intermediate guide roller 16 rotatably fitted to an intermediate guide rail portion 15 formed at the rear half of the outer side surface portion 10 of the cab 3.
The supporting structure of No. 6 is substantially the same as the supporting structure of the conventional guide roller 16 'described above, except that the shape of the guide roller assumes a drum shape as described above.

FIG. 5A shows an upper support structure of the slide door 16 according to the present embodiment. The upper guide rail portion 19 arranged at the lower end of the upper horizontal rail 17 has a rectangular frame shape in cross section. The bottom part 19a-2 is extended more outward than the conventional one, and the outer lower end corner is formed as a rectangular tube part 19a which is smaller and less than the conventional one. On the upper surface of the bottom portion 19a-2, a reinforcing plate member 19a- is provided to reinforce the guide roller rolling surface.
3 is attached. In addition, an inverted concave upper guide rail 19b is fixed to the ceiling portion 19a-1 of the rectangular tube portion 19a along the upper end edge 14a of the opening portion 14 as in the related art. At the top of the front edge of one of the slide doors 16,
A laterally L-shaped support bracket 16a projects substantially horizontally from the inner surface toward the outer side surface portion 10 of the cab 3 when viewed from the front of the cab.
A first upper guide roller 16b-1 that is rotatable about a substantially vertical axis and a second upper guide roller 16b-2 that is rotatable about a horizontal axis are mounted orthogonal to each other. .

Then, the first upper guide roller 16b
-1 is fitted to the inverted concave upper guide rail 19b disposed on the ceiling portion 19a-1 of the rectangular tube portion 19a, and rolls while suppressing the sliding door 16 from moving in and out of the cab. Further, the second upper guide roller 16b-2 rolls while being placed on the guide roller rolling surface on the upper surface of the reinforcing plate member 19a-3 of the square tube portion 19a. Therefore, most of the total load of the sliding door 16 according to the present embodiment is reduced by the reinforcing plate member 19.
a-3 is received by the guide roller rolling surface on the upper surface.

On the other hand, the trajectory of the inverted concave upper guide rail 19b for rollingly guiding the first upper guide roller 16b-1 is the first upper guide rail at the initial stage of the opening operation of the slide door 16. First, the guide roller 16b-1 projects greatly outward so as to shift to an arc having the same radius of curvature as the arc formed by the lower edge of the front half of the outer side surface portion 10. At the end, the slide door 16 is set so as to project further outward while curving in a shape along the front surface of the intermediate pillar 11 so that the slide door 16 smoothly rides on the step formed by the front surface of the intermediate pillar 11. Therefore, the sliding door 16 according to the present embodiment is
Of the upper guide rail 19b at the start of the opening operation is quickly followed by a curved line having a small radius of curvature in order to reach the same arc as the arc formed by the lower edge of the front half of the outer side surface portion 10. It is set to connect to an arc with a large radius of curvature.

As described above, when the locus of the upper guide rail 19b is set, a deformation is brought about such that the three-dimensional curved area formed in the upper part of the front half of the slide door 16 approaches a two-dimensional curved form (cylindrical surface). Therefore, the guide rail 19
b of the first upper guide roller 16b which is rotatably fitted to the first upper guide roller 16b
The support bracket 16a of the second upper guide roller 16b-2, which rolls on the guide roller rolling surface on the upper surface of the bottom part 19a-2 and the bottom part 19a-2, is not horizontal but slightly inclined downward and fixed to the door, and And the second upper guide roller 16b-2
The shape of each peripheral surface is drum-shaped, and the contact with each rolling surface is always in point contact to minimize friction during rolling.
The smooth opening / closing operation is enabled by the deformation of the slide door 16.

FIG. 5B shows a lower end support structure of the slide door 16 according to the present embodiment. The support structure extends from the lower end of the front edge of the outer side surface portion 10 of the cab 3 to the intermediate pillar 1.
1 is a lower guide groove 20 extending in an arc shape to the lower part of the front surface
Attached to the lower end of the front edge of the slide door 16,
And a lower guide roller 16e rotatably fitted in the lower guide groove portion 20. The guide groove portion 20 is formed on the back surface of the cab 3 at the periphery of the floor surface. The lower guide roller 16e is rotatably supported at the tip of an L-shaped bracket 21 fixed to the lower end of the front edge of the slide door 16. Lower guide roller 16 that rotates around this vertical axis
"e" is rotatably fitted in the lower guide groove 20. In the present embodiment, since the support brackets of all the guide rollers arranged in the upper, middle, and lower directions are swingably attached to the slide door around the vertical axis, the opening and closing of the slide door 16 can be performed more smoothly and lightly. I am able to operate.

If the guide trajectory of the first upper guide roller 16b-1 is simply an arc having the same radius of curvature as the arc along the lower edge of the three-dimensional curved surface area 10a, the lower guide roller 16e is, as described above, It protrudes greatly outside. Therefore, as described above, in the initial stage of the opening operation of the slide door 16, the first upper guide roller 16b-1 is guided so as to be shifted to an arc having the same radius of curvature as the lower edge of the front half of the outer side surface portion 10. Then, the lower guide roller 1
6e is made to approach the cab 3, but it is not possible to effectively reduce the overhang amount by itself. Therefore, in this embodiment, the lower guide roller 16e is further moved.
Is set so that the lower guide roller 16e is positively drawn into the cab 3 as much as possible.

According to the present embodiment, in addition to the function of the above-described support mechanism, a structure in which the radius of curvature at the rear half of the outer side surface portion 10, which is a characteristic feature of the first invention, is smaller than that at the front half is effective. In this way, the left and right width of the cab 3 can be made as large as possible.

FIG. 9 shows the locus of movement of the slide door 16 when the curved surface of the rear half of the outer side surface portion 10 of the cab 3 is constituted by a cylindrical surface having the same radius of curvature R1 at the lower end of the front half. It is. In the figure, a region surrounded by a two-dot chain line indicates the surface of the outer side surface portion 10 of the cab 3, and a portion shown by a one-dot chain line in FIG. If the radius of curvature in the rear half of the outer side surface part 10 is the same as that of the front half, even if a support guide structure for deforming the three-dimensional curved surface of the slide door 16 into a two-dimensional curved surface as described above is adopted, When the sliding door 16 is opened, the rear edge of the door 16 moves along an arc surface having the same radius of curvature as the outer side surface portion 10, so that the rear edge of the door 16 has a curvature as shown in FIG. It protrudes outward by a large radius. As a result, when the rear end edge is set inside the maximum turning radius of the swivel 2, the outer side surface portion 10 including the front and rear center portions is also provided.
, The entire curved surface having the same radius of curvature must be kept within the maximum turning radius, which leads to a reduction in the effective space of the cab 3. Thus, since the entire outer side surface portion 10 approximates a part of a single cylindrical body, the opening and closing operation of the slide door 16 is performed smoothly.

On the other hand, the radius of curvature R2 of the rear half of the outer side surface portion 10 is made smaller than the radius of curvature R1 of the front half, and the rear end edge of the slide door 16 is brought into contact with the surface of the rear half by the support mechanism of the central portion. 9, the rear edge of the slide door 16 may be closer to the inside of the turning radius than when the radius of curvature of the rear half is equal to the radius of curvature of the front half as shown in FIG. However, the amount of protrusion of the lower end of the front edge of the slide door 16 to the outside of the cab, which is indicated by a broken line in FIG. Therefore, by adopting the above-mentioned support mechanism and making the radius of curvature R2 of the rear half of the outer side surface portion 10 smaller than the radius of curvature R1 of the front half portion, the entire outer side surface portion 10 can be provided within the same turning radius. The curved surface can be shifted to the outside compared to the case where the radius of curvature of the front half and the radius of curvature of the rear half of the slide door 16 are the same, and the interior volume of the cab 3 can be increased.

FIG. 8 shows the locus of movement of the slide door 16 when the installation area of the cab 3 according to the present invention which can be accommodated within the maximum turning radius of the swivel base 2 is maximized. In the figure, the area surrounded by the two-dot chain line is the cab 3
2 shows the surface of the outer side surface portion 10, and a portion shown by a dashed line in FIG. As can be understood from this figure, in order to determine the installation position of the cab 3 according to the present embodiment on the swivel 2, first, position A of the lower end of the front edge of the cab 3 is set on the outermost circumference of the swivel area. Set. Next, the position B of the lower end of the front edge of the sliding door 16 when the sliding door 16 is completely opened is set on the outermost circumference of the turning area. Finally, the position C of the lower end of the rear edge of the sliding door 16 when the sliding door 16 is completely opened is set within the outermost circumference of the turning area. The position C of the lower end of the rear edge of the sliding door 16 when the sliding door 16 is completely opened is determined by the radius of curvature of the rear half of the outer side surface portion 10.

Although the above description has been made with respect to a typical embodiment of the present invention, the present invention is not limited to the above-described embodiment. Other than forcibly guiding the outside and inside, it is also possible to adopt a structure similar to the conventional one.Also, the shape of the rear half of the outer side surface of the cab is not a simple cylinder but is The curvature radius can be gradually reduced, and the center position can be formed as a three-dimensional arc surface that is sequentially moved forward, so that various deformations are possible.

[Brief description of the drawings]

FIG. 1 is a side view of a hydraulic shovel provided with a cab of the present invention.

FIG. 2 is a perspective view of the cab when the sliding door is closed, showing an exemplary embodiment of the present invention.

FIG. 3 is a perspective view of the cab when the slide door is opened.

FIG. 4 is a structural explanatory view schematically showing a top view form and a three-dimensional form of an outer side surface portion of the cab.

FIG. 5 is an explanatory view showing a support structure of the slide door according to the embodiment of the present invention.

FIG. 6 is an explanatory view showing a conventional slide door support structure.

FIG. 7 is an explanatory diagram of a guide path of a slide door in the cab according to the present invention.

FIG. 8 is a plan view showing an example of a guide trajectory of a slide door when a lower end edge of an outer side surface portion of a cab which is one of the embodiments of the present invention is simply formed in the same arc over the front and rear.

FIG. 9 is a plan view showing an example of a guide path of a slide door when the radius of curvature of the rear half of the outer side surface of the cab, which is one of the embodiments of the present invention, is smaller in the rear half than in the front half.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Running body 2 Revolving base 3 Cab 4 Engine room 5 Work implement 5a Boom 5b Arm 5c Bucket 6 Front part 6a Vertical surface 6b Inclined surface 7 Top plate part 8 Inside side part 9 Rear part 10, 10 'Outer side part 10a Three-dimensional Curved surface area 10b Cylindrical surface area 11, 11 'Intermediate pillar 12 Front pillar 13 Rear pillar 14, 14' Opening 14a, 14'a Upper end 15, 15 'Intermediate guide rail 15a, 15'b Intermediate guide rail 15 'A concave groove portion 16, 16' slide door 16a, 16'a bracket 16b-1, 16b-2 first and second upper guide rollers 16'b upper guide rollers 16c, 16'c intermediate guide rollers 16d, 16'd Bracket 16e Lower guide roller 16'e, 16'f First and second lower guide rollers 16g, 16'g Lower bracket 17, 17 'Upper side 18 Lower horizontal rail 19, 19 'Upper guide rail 19a, 19a' Square tube 19a-1, 19'a-1 Ceiling 19a-2, 19'a-2 Bottom 19a-3 Reinforcement plate 19b, 19'b Upper guide rail 20, 20 'Lower guide rail portion 20a, 20'a Lower guide rail 20'b Rolling surface forming member 20'b-1 Roller rolling surface 21 Two-dimensional curved surface area a Line segment a1 Boundary line R1, R2 Curvature radius A Lower end position of cab front edge B Lower end position of slide door front edge C Lower end position of slide door rear edge

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[Procedure amendment]

[Submission date] August 24, 1999 (1999.8.2
4)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is a side view of a hydraulic shovel provided with a cab of the present invention.

FIG. 2 is a perspective view of the cab when the sliding door is closed, showing an exemplary embodiment of the present invention.

FIG. 3 is a perspective view of the cab when the slide door is opened.

FIG. 4 is a structural explanatory view schematically showing a top view form and a three-dimensional form of an outer side surface portion of the cab.

FIG. 5 is an explanatory view showing a support structure of the slide door according to the embodiment of the present invention.

FIG. 6 is an explanatory view showing a conventional slide door support structure.

FIG. 7 is an explanatory diagram of a guide path of a slide door in the cab according to the present invention.

FIG. 8 shows an outer side of a cab according to an embodiment of the present invention .
The radius of curvature of the rear half of the lower edge of the surface is smaller than that of the front half.
Der plan view of a guiding trajectory example of scan Raidodoa upon
You.

FIG. 9 is an outer side of a cab according to an embodiment of the present invention .
The lower edge of the face is simply formed with the same arc over the front and back
It is a plan view showing a guide trajectory example Sly Dodoa when.

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] Fig. 8

[Correction method] Change

[Correction contents]

FIG. 8

[Procedure amendment 3]

[Document name to be amended] Drawing

[Correction target item name] Fig. 9

[Correction method] Change

[Correction contents]

FIG. 9

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Makoto Sasaki 3-1-1 Ueno, Hirakata-shi, Osaka Prefecture Inside the Komatsu Manufacturing Osaka Plant (72) Inventor 3-1-1 Ueno, Hirakata-shi, Osaka F-term (reference) in Komatsu Ltd. Osaka factory 2D015 EA03 2E034 FA01 GA01 GA08 GB15

Claims (5)

[Claims] A swivel is provided on a lower traveling body, is installed at a position deviated from the center of rotation of the swivel, and an outer side surface is formed with a curved surface that swells outward. A cab of a construction machine having a sliding door, wherein a radius of curvature of a rear half of the outer side surface is set to be smaller than a radius of curvature of a front half thereof. 2. The front window portion is formed on an inclined surface inclined rearward in a side view, and at least an upper region of a front half of an outer side surface portion extending rearward from an outer edge of the front window portion. However, the cross-sectional shape orthogonal to the vertical line is an arc shape, and is formed in a three-dimensional curved surface shape that gradually and three-dimensionally curves upward and inward toward the front inclined edge, It has substantially the same curved surface as the front half of the outer side surface portion, and the curved region of the rear half of the outer side surface portion is formed as an arc surface that is continuous with the curved region of the front half portion. A cab for a construction machine according to claim 1. 3. The sliding door according to claim 1, wherein the sliding door has a guide means for deforming and guiding the sliding door into a two-dimensional curved shape when the sliding door is opened / closed. 3. The cab of the construction machine according to 1 or 2. 4. A front window portion which is installed at a position deviated from the center of rotation of the turntable and has an inclined surface inclined rearward in a side view, and extends rearward from an outer edge of the front window portion. The outer side surface portion having an entrance and exit opening with a required width from the upper end edge to the lower end edge in the bay pole surface region in the front half thereof, the entire cross section orthogonal to the vertical line is formed of a curved surface bulging outward, A cab of a construction machine comprising a sliding door for opening and closing the entrance and exit, wherein at least an upper region of a curved region of the front half of an outer side surface portion extending rearward from an outer edge of the inclined surface. A cross-sectional shape perpendicular to the vertical line is an arc shape, and is formed in a three-dimensional curved surface shape that is gradually curved three-dimensionally upward and inward toward the front inclined edge, and the slide door is the outer side surface. The curved surface is almost the same as the first half of the part The curved region in the rear half of the outer side surface has the same curvature over the top and bottom, and is formed in an arc surface that is continuous with the curved region in the front half, and the radius of curvature is the curvature at the lower end of the three-dimensional curved surface region. The outer side portion is configured to guide the three-dimensional curved surface of the slide door to have a two-dimensional curved shape when the sliding door is opened / closed. A cab for a construction machine, characterized by comprising means. 5. A swivel base is provided on the lower traveling body, is installed at a position deviated from the center of rotation of the swivel base, and an outer side surface is formed with a curved surface bulging outward, and the outer side surface is formed on the outer side surface. In a construction machine provided with a cab having a slide door, a position of the cab is set such that a lower end of a front edge and / or an upper end of a rear edge of the cab is set to substantially the maximum turning radius of the swivel table, and A construction machine wherein the front and rear edges of the slide door at the time of opening are set to substantially the maximum turning radius of the turntable.