JP3368418B2 - Cab of construction machinery - Google Patents

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, and more specifically, it can widen a field of view of a driver in the cab, and can open and close by sliding between a front surface and a ceiling surface of the cab. The present invention relates to a cab for a construction machine, which can be provided with a door that slides and opens and closes on the side surface of the cab having a front window.

[0002]

2. Description of the Related Art Referring to FIG. 3, a cab 30 of a construction machine mounted on a hydraulic excavator, which is a typical construction machine, has a door 31 provided on a side surface S of the cab 30 for getting on and off. The front window 32 is provided on the front surface F and is opened and closed by sliding with respect to the ceiling surface T. Glass is entirely fitted into the door 31, the front window 32 and the like, and the front window 32 is configured so that it can be opened and closed as a whole to improve the visibility of the driver in the cab 30 and improve workability. Improvements and safety improvements are being made.

Continuing the description with reference to FIG. 4 together with FIG. 3, the cab 30 has a front pillar 33 which forms a space between a side surface S provided with a door 31 and a front surface F provided with a front window 32. is doing. In this front pillar 33,
A slide rail 33a is formed on the front window 32 side. By the slide rail 33a, the front surface F of the front window 32
The slide between the and the ceiling surface T is guided.

The door 31 includes a door frame 31a forming a door frame and a door hinge 31 for attaching the door frame 31a to the cab 30 so that the door 31 can be opened and closed.
and b. A door glass (not shown) is entirely fitted into the door frame 31a via a seal rubber (not shown). This door 31
As shown in FIG. 4, the side surface S of the cab 30 is disposed on the same surface as the front pillar 33.

[0005]

The cab 30 of the conventional construction machine having the above-mentioned configuration has the following problems to be solved.

(1) Referring to FIG. 4, since a door frame 31a is arranged in the front pillar 33 portion of the cab 30 along with the front pillar 33, the driver's seat inside the cab 30 Range where the outside of the cab 30 cannot be seen from the eyes 34 of the driver sitting at
Is a large one including the front pillar 33 and the door frame 31a.

(2) Further, as shown in FIG.
Since the door is opened and closed with the door hinge 31b as the center of rotation and the width W of the door 31 as the turning radius, a space of the width W is required to the side of the cab 30 to open and close the door 31.
Since construction machinery is often used in narrow construction sites, it is desirable that this required space be as small as possible. Therefore, instead of opening and closing the door 31 around the door hinge 31b, as shown in FIG.
If a slide mechanism is adopted so that it can be slid along the side surface S of 0 in the direction indicated by the arrow X (the front-back direction of the cab 30) to open and close, the slide rail 35 for guiding the door 31 and the slide rail 35. A stay 31c provided on the door 31 with a roller that slides inside moves into the slide locus 36 of the front window 32 that slides between the front surface F and the ceiling surface T, and interferes with the front window 32. I will end up. Therefore, it is difficult to adopt a sliding door on the side surface of the cab 30 having the front window 32 that slides and opens. The front window 32 is the ceiling surface T
Although a sliding door can be provided by not sliding the front window to the cab 30, in this case, the front window is a small opening / closing window that is opened and closed within the size of the window frame fixed to the front F. Become.

The present invention has been made in view of the above facts, and its technical problem is to reduce the blind spot of the driver in the cab to widen the field of view, and to open and close by sliding between the ceiling surface. To provide a cab for a construction machine, which can adopt a sliding door even when it has a front window.

[0009]

In the present invention, in order to solve the above technical problems, a door provided between the side surface of the cab and openable and closable and a ceiling surface of the cab on the front surface of the cab. In a cab of a construction machine, comprising: a front window provided so as to open and close by sliding the door, the door is located outside the front pillar that forms a space between the side surface and the front surface, from the side surface side to the front surface side. There is provided a cab for a construction machine, comprising a bending portion formed to face toward.

In the cab of the construction machine according to the present invention, the door frame adjacent to the front pillar is arranged so as to bend around the outside of the front pillar. Therefore, since the door frame is arranged outside the front pillar in a place invisible to the driver, the blind spot between the front pillar and the cab frame in the past is small only for the front pillar, and the driver's view is widened. can do.

In a preferred embodiment, the door is slid along the side surface to be opened / closed by a slide mechanism provided inside the door.

A space is formed inside the door of the cab according to the present invention by forming a bent portion in the door frame. Therefore, by disposing the slide mechanism of the cab in this space, it is possible to employ a sliding door that does not interfere with the front window that is opened and closed by sliding between the ceiling surface.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS In the following, a more detailed description will be given with reference to the attached drawings, which illustrate preferred embodiments of the cab of the construction machine constructed according to the present invention.

Referring to FIG. 1, a cab, generally designated by numeral 4, mounted on a hydraulic excavator 2 which is a typical construction machine, includes a door 8 provided on a side surface S of the cab 4 so as to be openable and closable. , A front window 1 provided on the front surface F of the cab 4 so as to slide between the ceiling surface T of the cab 4 and open and close.
It has 0 and. A state in which the front window 10 is being slid is shown by a chain double-dashed line in FIG.

Continuing the description with reference to FIG. 2, the cab 4
The main body of (1) is integrally formed into a substantially rectangular parallelepiped shape by welding members formed mainly of thin steel plates to each other. A front pillar 12 is formed between the side surface S of the cab 4 on which the door 8 is provided and the front surface F of the cab 4 on which the front window 10 is provided. The front pillar 12 is formed into a column shape by bending a thin steel plate. The front pillar 12 is formed with a guide rail 12a having a groove-shaped cross section in its longitudinal direction (direction perpendicular to the paper surface in FIG. 2). The guide rail 12a is engaged with a slide opening / closing roller 10a provided in the front window 10 (the front window 10 will be described later in detail). It should be noted that the cab 4 is provided on the opposite side of the front pillar 12 with the front window 10 interposed therebetween, symmetrically with the front pillar 12, and in front of the front pillar 13.
Are formed.

The door 8 is provided so that it can be opened and closed by sliding along a side surface S of the cab 4 in a direction indicated by an arrow X by a slide mechanism 9 provided inside the door 8. The door 8 has a door frame formed by a door frame 8a formed by forming a thin steel plate. Door frame 8a
A door glass (not shown) is wholly fitted into the door via a seal rubber (not shown). The door frame 8a includes an arcuate bent portion 8b formed outside the front pillar 12 so as to extend from the side surface S side of the cab 4 toward the front surface F side. And the bent portion 8b
The space E inside the door 8 formed by providing
Further, a slide mechanism 9 for sliding the door 8 is provided.

The front window 10 includes a window frame 10b formed by forming a channel-shaped frame into a substantially rectangular shape, and a window glass 10
It is formed by fitting c through a seal rubber 10d. At the four corners of this rectangular window frame 10b, the rollers 10a
Are attached respectively. The front window 10 may be substantially the same as a well-known front window.

The slide mechanism 9 is attached to the slide rail 9a attached to the main body of the cab 4 for guiding the slide of the door 8, the stay 9b attached to the door 8 and the stay 9b, which are shown by a chain double-dashed line. And a roller 9c that freely slides in the rail 9a. The slide mechanism 9 is substantially the same as a known conventional slide mechanism except that the position where the slide mechanism is arranged is different. Therefore, detailed illustration and description thereof will be omitted.

The operation of the cab 4 of the construction machine as described above will be described with reference to FIG. 6 together with FIGS. 1 and 2.

(1) In the door 8 of the cab 4, the bent portion 8 is arranged in the door frame 8a adjacent to the front pillar 12 so as to wrap around the outside of the front pillar 12.
b is formed. Therefore, the blind spot θ2 from the eyes 34 of the driver is smaller than the blind spot θ1 (see FIG. 4) in which the conventional front pillar and the door frame are combined, because the blind spot θ2 is only the portion formed by the front pillar 12. And
The driver's wide field of view can be ensured accordingly.

(2) Further, inside the door 8, a space E is formed by forming the bent portion 8b in the door frame 8a. Therefore, it is possible to dispose the slide mechanism 9 for sliding the door 8 in the space E, and the slide locus 36 of the slide mechanism 9 and the front window 10 can be arranged.
It is possible to employ a slide type door 8 that does not interfere with and. As a result, as shown in FIG. 6, the space on the side of the cab 4 for opening and closing the door 8 of the cab 4 according to the present invention is equal to the thickness L of the door 8.
Compared with the conventional space W for opening and closing the cab 30, the space is reduced by (W−L), and the door can be easily opened and closed in a narrow space.

The present invention has been described above in detail based on the embodiments. However, the present invention is not limited to the above embodiments, and various modifications or changes are made within the scope of the present invention as described below. It can be modified.

(1) In the embodiment of the present invention, the bent portion 8b of the door 8 is formed in an arc shape. However, due to the shape of the cab, the shape of the door, etc., the bent portion 8b is not an arc shape. It may have a bent shape.

(2) In the embodiment of the present invention, the door 8 is adapted to slide and open / close by the slide mechanism 9. However, depending on the specifications of the construction machine to which the cab 4 is mounted, or When it is preferable to open and close the door 8 about the hinge, the door hinge 31b as described in the conventional cab 30 may be used to open and close the door 8.

(3) Further, in the embodiment of the present invention, the door 8 is applied to the entry / exit door of the cab 4, but the door can be opened / closed for other than entry / exit such as ventilation. It can be a door.

[0026]

According to the cab of the construction machine constructed according to the present invention, the blind spot of the driver in the cab can be reduced to widen the field of view, and the cab can be slid between the ceiling surface and opened / closed. Provided is a cab for a construction machine in which a sliding door can be adopted even when the front window is provided.

[Brief description of drawings]

FIG. 1 is a side view of a hydraulic excavator including a cab of a construction machine configured according to the present invention.

FIG. 2 is a cross-sectional view of FIG. 1 viewed in the direction of arrows AA.

FIG. 3 is a side view of a hydraulic excavator including a cab of a conventional construction machine.

FIG. 4 is a sectional view of FIG. 3 viewed in the direction of arrow BB.

FIG. 5 is an explanatory view showing a conventional door slide mechanism when FIG. 3 is viewed in the direction of arrow BB.

FIG. 6 is an explanatory view comparing a space for opening and closing a door of a cab of a construction machine configured according to the present invention and a conventional cab, as viewed from above the cab.

[Explanation of symbols]

2: Hydraulic excavator (construction machinery) 4: cab 8: Door: 8a: Door frame 8b: bent part 9: Slide mechanism 10: Front window 12: Front pillar 30: Cab 31: Door 32: Front window θ1: blind spot θ2: blind spot F: Front of cab S: Side of cab T: Cab ceiling surface

Claims (2)

(57) [Claims] 1. A construction machine comprising: a door provided on a side surface of the cab so as to be openable and closable; and a front window provided on a front surface of the cab so as to open and close by sliding between a ceiling surface of the cab. In the cab, the door is provided with a bent portion formed outside the front pillar that is formed between the side surface and the front surface so as to extend from the side surface side to the front surface side. Mechanical cab. 2. The cab for a construction machine according to claim 1, wherein the door is slid along the side surface and opened / closed by a slide mechanism disposed inside the door.