JP2003176552A - Door structure of cab for construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To constitute a slide mechanism provided at a lower part of a sliding door for a construction machine such as a hydraulic shovel, not to have such defectiveness as to make opening/closing operation unsmooth with mud and sand. <P>SOLUTION: A guide rail 14 is provided below a cab floor face part 9f through a support bracket 12 and a support body 13. The guide rail 14 comprises a cylindrical body part 14a and a guide plate 14b, and a first traveling roller 16 out of first, second and third traveling rollers 16, 17, 18 supported on the door 11 side, rolls on the upper side of the outer peripheral surface (the guide face) of the body part 14a, while the second and third traveling rollers 17, 18 roll in the state of holding the outer peripheral surface of the body part 14a from the right and left sides. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technical field of a cab door structure in a construction machine, which is disposed in, for example, a hydraulic excavator or the like, for an operator to get on and off.

[0002]

2. Description of the Related Art Generally, some construction machines such as hydraulic excavators are provided with a cab so that a seat portion of an operator is separated from a front working portion. In such a construction equipment, an operator gets on and off. The opening is provided with a door for opening and closing the opening. By the way, as a door attached to the cab, there is a door of a sliding type that opens and closes along the side surface of the cab so that a large opening can be secured even if there is not a large space around the door.
As such a door, for example, there is a slide type one in which rollers provided at a plurality of upper and lower positions on the door side are configured to roll (run) a plurality of upper and lower guide rails provided on the cab side, respectively. In the case of the slide type construction, since the guide rail provided below the cab is provided below the opening through which the operator enters and exits, the mud that adheres to the operator's shoes when getting on and off the cab. And sand may fall on the guide rails and accumulate, or mud and sand that have been flipped up by the traveling operation of the lower traveling body may accumulate, which impairs the smooth opening and closing of the door. There was a problem. Therefore, for example, as shown in Japanese Patent Application Laid-Open No. 11-336128, a guide rail having a rail surface that faces the horizontal direction is provided below the cab, and a scraper is provided on a bracket that supports the roller so that the roller travels. In the previous stage, a scraper was proposed to wipe off the mud accumulated on the rail surface of the guide rail, which allows the smooth opening and closing of the door.

[0003]

However, in the above-mentioned conventional apparatus, the mud accumulated on the rail surface is scraped off by the scraper, and the mud tends to accumulate on the rail surface. Moreover, since the door provided with the scraper and the cab provided with the guide rail have a relationship of moving relative to each other, in order to perform smooth relative movement between them, the scraper and the guide rail must be vertically moved. A gap in the direction is required. As a result, even if the mud or sand on the rail surface of the guide rail is previously wiped off by the scraper, the mud or sand corresponding to the gap between the scraper and the rail is on the rail surface. Since the roller will be left behind by all means and the roller will run on the remaining mud or sand, there is still a problem that it is difficult to open and close the door, and the opening and closing work of the door becomes heavy. There is also a problem that the present invention has a problem to be solved by the present invention. Moreover, in the above-mentioned conventional one, since the door side edge portion of the guide rail is cut off in a flat plate state in order to smoothly remove mud and sand on the rail surface, the door (roller) is left as it is. There is a risk that it will come off the guide rail. For this reason, in this structure, an auxiliary roller having a shaft core directed in the vertical direction is provided on the bracket on the door side, and the auxiliary roller is fitted into a groove-shaped guide rail separately provided on the lower surface of the cab. Since the door is prevented from coming off, there is also a problem that the structure becomes complicated, and there is also a problem to be solved by the present invention.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances in order to solve these problems. A door for opening and closing an opening formed in the cab is provided in the cab. A slide mechanism for sliding movement along the side surface, a guide rail provided at the bottom of the cab,
In the case where the guide rail is configured by using a roller supported on the door side to run on the guide rail, the guide rail is columnar, and a plurality of rollers roll on the outer peripheral surface. The guide rail is set so as to be sandwiched from the left and right. By doing so, it is possible to prevent mud and sand from accumulating on the guide rail and prevent the smooth opening / closing operation of the door from being impaired. In this, the roller of the present invention includes an upper roller rolling at least on the upper guide surface of the guide rail,
It may be configured to include a pair of side rollers that roll on both side guide surfaces sandwiching the upper guide surface. Further, in this, the guide rail of the present invention may be formed in a cylindrical shape. Further, in this, the guide rail of the present invention is configured to include a column-shaped rail main body and a plate protruding downward from a lower end portion of the rail main body, and the plate is a bracket provided below the cab. It can be supported via a support member that is disposed with a predetermined gap therebetween, so that mud and sand do not accumulate below the guide rail. Furthermore, in this structure, the support member of the present invention is formed in a columnar shape, and mud and sand do not accumulate on the support member.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Next, referring to FIG.
~ It demonstrates based on the drawing of FIG. In the drawings, reference numeral 1 denotes a hydraulic excavator, and the hydraulic excavator 1 has an upper revolving structure 3 which is rotatably supported above a crawler-type lower traveling structure 2, and a pedestal forming the upper revolving structure 3. A front attachment 8 including member devices such as a boom 5, an arm 6, and a bucket 7 is attached to a substantially central portion of the frame 4. Further, a cab 9 for an operator to sit and operate a hydraulic excavator is provided on one side of the front attachment 8, and a tank chamber 10 such as a fuel tank or a hydraulic oil tank is provided on the other side. The basic configuration, such as the arrangement, is the same as before.

The cab 9 has a pair of left and right side portions 9a and 9b and a pair of front and rear side portions so as to constitute an operation room provided with a seat (not shown) on which an operator is seated, various levers, meters and the like. 9c, 9d, and the upper ceiling surface portion 9
e, a floor surface portion on the lower side (provided on the gantry frame 4) 9f, and a side surface portion on the side not adjacent to the front attachment 8 (in the present embodiment,
In FIG. 2, an opening is formed in the front half of the left side surface 9a), and a door 11 is provided in the opening so as to be slidable in the front-rear direction. Between the door 11 and the left side surface portion 9a of the cab 9, upper, middle, and lower slide mechanisms U, M, and L are respectively interposed at three locations including an upper portion, a vertical intermediate portion, and a lower portion. The door 11 is attached via these slide mechanisms U, M, L, but the present invention is applied to the lower slide mechanism L provided at the lower part of these slide mechanisms U, M, L. There is. Here, each of the slide mechanisms U and M located in the upper and middle portions is provided with a conventionally used mechanism, and a detailed description thereof is omitted here, but the upper slide mechanism U is a front edge portion of the door. And a rail 9g provided in the front half of the upper portion of the left side surface 9a (not shown). Further, the intermediate slide mechanism M is configured by using a roller provided on the rear edge of the door and a rail 9h provided on the rear half of the left side surface 9a.

The lower slide mechanism L has the following structure. That is, the base end portion of the plate-like support bracket 12 protruding downward is arranged along the door side edge portion at the lower facing portion of the opening which is the front half portion of the lower surface of the floor surface portion 9f constituting the cab 9. It is provided integrally. At the tip (lower end) of the support bracket 12,
Through holes 12a are opened with a predetermined gap, and the base end portions of a plurality of support bodies (support members of the present invention) 13 are respectively fixed through the through holes 12a. Each of these support bodies 13 is formed in a cylindrical rod shape, and the tip end portion is set so as to project toward the door 11 and be located inside the door side edge portion of the floor surface portion 9f. Since each support body 13 is located below the cab floor surface portion 9f and is provided in the horizontal direction, it is provided in a place where mud is likely to fall and accumulate, but the support body 13 has a predetermined gap. The mud is hardly accumulated on the upper surface (upper peripheral surface) of the support body 13 and is slid down on the circular outer peripheral surface.

On the other hand, 14 is a guide rail provided on the cab 9 side, and the guide rail 14 is formed in a curved shape so as to gently curve along the edge portion on the door side. Further, the id rail 14 is formed in a cylindrical shape, and is formed by a rail main body 14a whose substantially entire outer peripheral surface can serve as a guide surface, and a plate surface which is long along the rail length direction of the rail main body 14a and faces the vertical direction. Guide plate (corresponding to the plate of the present invention) 14b. One end (upper end) of the guide plate 14b is fitted in the lower half of the rail body 14a, and the other end ( (Bottom end)
Protrudes downward from the lower end of the rail body 14a. Then, a plurality of through holes 14c are formed at the other end of the guide plate 14b, and the distal end portion of the support body 13 is fixed to each of the through holes 14c so that the guide rail 14 passes through the support body 13. It is set so as to be fixed to the support bracket 12 on the cab 9 side. In the fixed state of the guide rail 14, the guide rail 14 is positioned below along the door side edge of the floor surface portion 9f, and the rail body 14a is formed in a cylindrical shape and faces the upper side in the horizontal direction. It has a structure with almost no faces. Therefore, even if the mud falls on the guide rail 14, it slides down on the circumferential outer peripheral surface of the rail body 14a, so that the mud and sand are less likely to collect on the guide rail 14. Further, also in the lower portion of the guide rail 14, the support body 13 is provided with a predetermined gap, and since it is formed in the columnar shape as described above, the muddy soil is also formed in the lower portion of the guide rail 14. It is set so that no sand or sand accumulates.

Reference numeral 15 denotes a roller bracket which is attached to the front end of the lower end of the door 11 so as to project toward the cab 9. The roller bracket 15 includes a mounting piece 15a which is a horizontal surface, and the mounting piece 15a. And a pair of reinforcing piece portions 15b that face downward from the front and rear edge portions. The tip of the attachment piece 15a is projected above the guide rail 14 on the cab 9 side so as to face below the floor 9f in a state where the door 11 is attached to the opening. First, second, and third traveling rollers 1 for rolling (traveling) on the outer peripheral surface of the guide rail 14
6, 17, and 18 are provided. Each of the first, second,
The third traveling rollers 16, 17, 18 are roller surfaces 16 a, 17 a, which are arcuate concave portions, respectively, for rolling on the cylindrical outer peripheral surface (guide surface) of the guide rail 14.
Roller bodies 16b, 17b, 18b provided with 18a;
It comprises roller shafts 16c, 17c and 18c which support the center of rotation of each roller body 16b, 17b and 18b.

An opening 15c is formed at the front end of the roller bracket mounting piece 15a at the rear side in the front-rear direction (upper side in FIG. 5). And the opening 15c
The fixing piece 19 and the fixing piece 1 are provided on the lower side surfaces of the left and right edges of the
The roller shaft 16c of the first traveling roller 16 is fixed by using a bolt 19a for screwing 9 onto the mounting piece 15a. As a result, in the first traveling roller 16, the roller shaft 16c faces the left-right direction and the roller body 16b
Is disposed on the roller bracket 15 in a state in which the upper part of is exposed upward from the opening 15c. The roller surface 16a of the first traveling roller 16 is the guide rail 14a.
Is set to roll on the upper outer peripheral surface, which is the upper guide surface of the guide rail 14, as an upper roller that abuts on the upper side.

Further, a pair of left and right shaft fixing members 20 are fixed to the lower side surface located on the front side of the tip of the mounting piece 15a, and these shaft fixing members 20 correspond to the side rollers of the present invention. The roller shafts 17c and 18c of the second and third traveling rollers 17 and 18 are fixed in a state of being oriented in the vertical direction. Then, these second and third traveling rollers 1
7 and 18, the roller surfaces 17a and 18a respectively contact the outer peripheral surfaces of the guide rail 14 that face each other on the left and right sides,
It is arranged so as to have a positional relationship of rolling the part,
The rollers 17 and 18 are configured to sandwich the guide rail 14 from both left and right directions. As a result, each of the traveling rollers 16, 17, 18 is moved to the guide rail 14
During the operation of rolling, the door 11 is swayed in the left-right direction, and the traveling rollers 16, 1
The stoppers 7 and 18 are set so as to prevent them from coming off the guide rail 14.

In the embodiment of the present invention constructed as described above, when the operator gets on and off the hydraulic excavator 1, the door 11 arranged on the left side surface portion 9a of the cab 9 is arranged.
Is opened and closed via the upper, middle and lower slide mechanisms U, M and L. In this case, the lower slide mechanism L uses the guide rail 14 provided below the cab floor surface portion 9f,
The first, second, and third traveling rollers 16, 17, and 18 mounted on the roller bracket 15 on the door 11 side are configured to roll. In this configuration, the guide surface of the guide rail 14 has a cylindrical outer periphery. Is a face. Therefore, as described above, the guide rail 14 has almost no horizontal surface on which mud or sand is likely to collect, and even if mud or sand falls on the guide rail 14, they do not collect on the guide rail 14. , The first, second and third traveling rollers 16, 17,
The smooth running by 18 is not impaired.

In addition, in this structure, the support body 13 arranged in the horizontal direction for supporting the guide rail 14 on the cab 9 side is a cylindrical body, and the support body 13 having such a cylindrical body is predetermined. It has a structure in which there is a gap. Therefore, between the guide rail 14 and the cab 9 facing the horizontal direction where mud and sand are likely to accumulate, there is a cylindrical support body 13 having a predetermined gap, and the mud and sand are also present at the portion. There is no accumulation of sand.

Further, in this one, the guide rail 14
The first, second and third traveling rollers 16, 17,
18 is configured to run, and the second and third rollers 1
Since 7 and 18 are configured to roll on both sides so as to sandwich the guide rail 14 from both the left and right sides, the swing of the door 11 can be prevented, and the traveling rollers 16, 17 and 18 can be guided by the guide rails 14. It is possible to prevent it from coming off from the rail, and without the need for a separate rail to prevent it from coming off like the conventional one,
The slide mechanism L with good operability can be configured.

Of course, the present invention is not limited to the above-mentioned embodiment, but the rail shape is not cylindrical, but is triangular or square as in the other embodiments shown in FIG. The guide rail G may have a polygonal shape such as a shape, a pentagonal shape, or a hexagonal shape. In this case, the plurality of traveling rollers R have the same structure as in FIGS. 7 (A), (B), (D),
For (E), (F), (G), (H), and (K),
The upper roller rolls on the top portion facing the top side, respectively, as shown in FIG. 7 (C), (I), (L) or (M).
As a result, the upper roller is not configured to roll on the side facing the top side as in the above, and as a result, as with the case of the cylindrical guide rail as in the first embodiment described above, the upper guide surface is covered with mud. It is convenient because there is no accumulation of sand. Furthermore,
In FIG. 7 (J), the traveling roller does not roll on the side portion although the side portion faces the top side, and the pair of upper rollers rolls on the left and right inclined side portions. Therefore, even this one is convenient because no mud or sand accumulates on the rolling surface.

[Brief description of drawings]

FIG. 1 is an overall side view of a hydraulic excavator.

FIG. 2 is an overall plan view of a hydraulic excavator.

FIG. 3 is a side view of a cab portion.

4 is a sectional view taken along line XX in FIG.

FIG. 5 is a bottom view of the lower slide mechanism.

6 is a cross-sectional view taken along line XX in FIG.

7 (A), (B), (C), (D),
(E), (F), (G), (H), (I), (J),
(K), (L) and (M) are pattern diagrams showing other examples of the guide rail and the roller, respectively.

[Explanation of symbols]

1 hydraulic excavator 2 Undercarriage 9 cabs 9a side part 9f Floor section 11 doors 12 Support bracket 13 Support body 14 Guide rail 14a Rail body 14b Guide plate 15 Roller bracket 16 First running roller 16a Roller surface 17 Second traveling roller L lower slide mechanism

Claims (5)

[Claims] 1. A slide mechanism for slidingly moving a door for opening and closing an opening formed in a cab along a side surface of the cab, a guide rail provided at a lower portion of the cab, and a bearing on a door side for traveling the guide rail. The guide rail has a columnar shape, and a plurality of rollers roll on the outer peripheral surface of the guide rail, and a pair of the rollers are set so as to sandwich the guide rail from the left and right. Cab door structure for existing construction machinery. 2. The roller according to claim 1, wherein the rollers are at least an upper roller that rolls on an upper guide surface of the guide rail, and a pair of side rollers that roll on both side guide surfaces sandwiching the upper guide surface. A cab door structure in a construction machine, which is configured with. 3. The cab door structure for a construction machine according to claim 1, wherein the guide rail is formed in a cylindrical shape. 4. The guide rail according to claim 1, 2 or 3, wherein the guide rail includes a columnar rail main body and a plate protruding downward from a lower end portion of the rail main body.
A door structure of a cab in a construction machine, wherein the plate is supported by a bracket provided below the cab via a support member arranged with a predetermined gap. 5. The cab door structure for a construction machine according to claim 4, wherein the support member is formed in a cylindrical shape.