JPH0158282B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the cab structure of a shovel-type excavating machine such as a backhoe. The configuration of conventionally known shovel-type excavation machines is explained using a backhoe as an example.
Crawler 1 as a traveling device as shown in the figure
A rotating frame 2 is provided on the rotating frame 2.
It has a structure in which a cab 3 , which is a driver's cab, and working machine parts including hydraulic cylinder devices 4, 5, 6, arms 7, 8, and a bucket 9 are mounted on top, and the cab 3 is installed indoors. The structure is designed so that the driver can perform driving operations while visually observing the driving state of the arms, etc., the surrounding work environment, etc. In other words, the front and sides of the cab 3 are provided with a see-through glass window type structure to the extent possible, and the front in particular is designed to provide a wide field of view and to allow work to be carried out with the windows open if necessary. As shown in FIGS. 2A and 2B, the upper window of the upper and lower sections is often of a fully open type window structure that can be opened by sliding. The reason why the front of the cab is divided into the lower fixed glass structure and the upper fully open window structure as mentioned above is because the outer shape of the cab limits the driving range of the arms, buckets, etc. as much as possible. On the other hand, it is desirable to have a structure in which the front of the cab is not too crowded, while the interior volume of the cab is to allow for the installation of operating levers, etc., to allow as much room as possible for the driver's activities, and to give the driver a comfortable view of the front and downwards. As shown in Fig. 2A, the horizontal bar 10 is provided slightly below the middle in the vertical direction, and its external shape has different slopes on the upper and lower sides (the shape of the horizontal bar bulges outward most). This is because it is better to form the shape, and in this case, it is considered sufficient if the window can be opened and closed from the upper side. In order to make the window structure on the upper side of the front part a fully open type, generally, for the window opening 20,
When the window board is closed, the structure consisting of the glass that closes it and the frame that supports it (hereinafter referred to as the window panel)
The frame of the window board 11 is pressed against the rubber packing 23 attached to cover the edges of the windows ₁ , ₃₂ , and ₃₃ and the rubber packing (not shown) attached to the horizontal beam 10. When the window panel is opened, the window board is retracted into the cab ceiling, and this retraction is achieved by rollers 12, 1 on the upper and lower sides of the left and right sides of the frame of the window board 11, respectively.
3, and a guide rail 2 installed vertically inside the front window opening peripheral frame 3 ₂ , 3 ₃
1, 21, and guide rails 22, 22 installed in the front-rear direction on the left and right sides of the ceiling inside the cab.
The rolls 12 and 13 of the window plate 11 are slidably fitted to the guide rails and guided so that the window plate can be stored by operating like a movement link of a Cardan mechanism. is normal. States a, b, and c shown in FIG. 5 show sequential postures in which the window board 11 is being pulled up from the state in which it closes the front window opening and is being retracted and stored in the lower surface of the ceiling. In the figure, 14 is the glass of the window plate 11, 15 is the frame, 16 is the rubber packing, 17 is the handle, 18 is the glass fixed to the lower side of the front of the cab, 19 is the rubber packing for its support, 20
is the opening of the upper front window. Incidentally, as a recent trend, it has been desired to provide better visibility for the driver with respect to the above-mentioned configuration of the front part of this type of cab structure, and for this purpose, the horizontal beams shown in Fig. 2 A and B are A structure in which 10 is omitted has been proposed. Fig. 6 shows the shape of the front surface of the cab with such a configuration, and the lower fixed glass 118 is fixed to the cab body on three sides of the left and right edge frames and the lower edge frame through rubber packings 119 (Z-type rubber packing). The upper edge of the glass is left open as it is. In a cab structure with such a configuration, when the upper front window plate is opened, there is no horizontal bar that blocks the view as in the conventional case, so this type of cab structure is particularly difficult for the driver. This has the effect of improving forward and downward visibility, which is important for excavation machines. However, although such omission of the horizontal bars improves the visibility described above, it poses a problem in that the functions traditionally performed by the horizontal bars must be supplemented separately. For example, compensation for the decrease in rigidity of the cab's overall structure due to the omission of horizontal bars, setting of the lowering limit position when the upper window panel is closed, sealing performance (rain-proofing) by contact with the lower fixed glass when the upper window panel is closed, etc. ) It is a problem of securing etc. The present invention has been made in order to effectively solve the problems in the cab structure in which the front crosspiece is omitted, and in particular, when the upper window plate is closed, the lower fixed glass and the upper window plate are fixed. The purpose of the present invention is to provide a simple rain cover structure for draining rainwater leaking into the cab from the outside into the cab at the contact portion to the outside of the cab. That is, in the cab structure in which the horizontal beam is omitted in the front section described above, the lower fixed glass 118
It is necessary to prevent the glass from coming out upward due to vibrations or the like, and for this purpose, a stopper that engages with the upper edge of the lower fixed glass 118 must be provided at portions A and A in FIG. For this reason, the surface formed by the upper edge of the lower fixed glass 118 has a slightly stepped shape on both left and right sides (portions A and A),
Even if sealing performance is obtained by pressing the rubber packing attached to the lower edge of the upper window plate onto such a surface, minute gaps may occur due to the stepped structure.
Alternatively, it is difficult to avoid the occurrence of a portion where the seal pressure is lowered, resulting in problems such as rainwater entering the cab chamber from portions A and A in FIG. 6. Therefore, the present invention provides a rain cover structure that reliably drains rainwater to the outside of the cab when such rainwater enters. This function also functions as a stopper for determining the lowering limit of the upper window plate when it is closed. The gist of the present invention is to have an opening in the front part of the cab whose vertical middle part is protruded forward in a substantially dogleg shape, and a lower part of the opening located below the middle part of the opening. In the opening part, a fixed frame for fixing the glass is installed in a substantially U-shape along the peripheral frame at a position slightly inside the peripheral frame of the opening, and the fixed glass that closes the lower opening part is attached to this fixed frame. The upper opening part located above the middle part of the opening is provided with a window plate that can open and close the upper opening part by pulling up and down. In a cab structure in which the horizontal beam is omitted and a rubber gasket for sealing when the window plate is closed that abuts against the upper edge is attached, a wall-like apron portion is provided between the peripheral frame of the opening and the fixed frame to partition the inside and outside of the cab. At the same time, a bracket is fixed to the inside of the left and right upper ends of the fixed frame extending in a substantially U-shape, and the bracket is in contact with the inner wall of the peripheral frame to form a pocket-shaped rainwater catcher, and the front end of this bracket is attached to the apron. The cab structure of a shovel-type excavating machine is characterized in that the cab structure is inclined to drain intruding rainwater toward the bottom. Embodiments of the present invention will be described in detail below based on the drawings, in which the same structural parts as in FIGS. 1 to 5 are shown with 100 added to the reference numerals. The present invention is applied to a cab equipped with a front structure without horizontal bars as shown in FIG. 6, and in such a structure, the lower fixed glass 118 is Since the upper edge is exposed, rubber packing is attached to the lower surface of the window plate in order to obtain sealing properties at the portion where the window plate that closes the opening 120 contacts and engages the lower fixed glass 118. It is preferable that this rubber packing is brought into butt engagement with the upper end surface of the lower fixed glass 118. Figure 7 shows rubber packing 1 on the lower edge like this.
This rubber packing 123 is attached so as to span both left and right ends of the lower edge of the window panel 111, and has a hollow cylindrical shape. As will be described later, when the lower fixed glass 118 abuts against and engages with the upper edge thereof, the lower fixed glass 118 is sufficiently flexibly deformed to obtain good sealing performance. Note that 112 and 113 are rollers, 114 is a glass, 115 is a rectangular frame, 116 is an I-shaped rubber packing for fixing the glass 114 to the frame 115, and 117 is a handle. Stopper brackets 140 are fixed to the left and right rear surfaces of the lower end side of the frame 115 of the window plate 111, as shown in FIGS.
11 for positioning when the opening 120 is closed. Note that the fixed position of the lower fixed glass 118 requires that the lower end rubber packing 124 of the window plate 111 abuts and engages its upper edge, and the window plate 111 is attached to the peripheral frames 103 ₁ , 103 ₂ of the front window opening. ，
Packing 123 on its inner surface against 103 ₃
Therefore, the position must be set slightly inwardly from the front of the cab 103. Therefore, the fixing frame 125, which is approximately U-shaped in the front and supports the lower fixed glass 118 through the packing 119 (Z-shaped rubber), is provided slightly retreating inward from the front surface of the cab, and this fixing frame 125 and the cab The gap between the front plates is closed by a wall surface 126 that connects them so as to partition the inside and outside of the cab. The front portion of the lower fixed glass 118 faces the front of the cab via an apron portion 127 surrounded by a concave wall surface open upward. Then, approximately U supporting the lower fixed glass 118 is provided.
Rainwater draining brackets 128, which also serve as positioning and locking for the lower fixed glass 118, are fixed to the left and right upper ends of the letter-shaped fixed frame 125. FIG. 9 shows a perspective view of this rainwater draining bracket 128, in which a platform section 129 having an upper end holding section 130 of the lower fixed glass is provided with a platform section 129 that is bent at a substantially right angle from its front end and extends downward. A fixing portion 131 is provided on the rear end side of the platform portion 129 so as to abut against the upper edge of the lower fixed glass from above. A rubber stopper 132 is fixed to the window plate 111 to determine the lowering limit of the descending window plate 111. In practical terms, it is desirable that the rubber stopper 132 is fixed in such a way that its height can be adjusted by using, for example, screw means. A tapered plate part 133 is formed on the side of this platform part 129 so as to be slightly stepped and inclined toward the front end at a lower position, and the periphery of this tapered plate part 133 is It is attached to the inner surface of the wall and fixed by welding. Note that 134 is a standing wall formed on the rear edge and side edge of the platform portion 129 and the tapered plate portion 134, and with such a configuration, the bracket 128 for rainwater drainage as a whole is formed on the inner surface of the cab wall. In collaboration with
A pocket-shaped rainwater catcher is formed inside the left and right upper ends of the lower fixed glass 118.
Moreover, the front end of the tapered plate portion 134, which is inclined forward and downward, is connected to the wall surface 126 of the apron portion 127.
It is integrated in a continuous manner at the top end. The rainwater drainage bracket 128 in this embodiment is configured to be fixed to the fixed frame 125, the wall surface 126, and the inner surface of the cab wall by welding, respectively, but this is done by bolting to a predetermined position. It may be assembled and fixed in position, and a sealing member may be interposed at the engagement contact portion to form a pocket portion that does not leak rainwater. According to such a configuration, when the window plate 111 is lowered to close the front window opening, the window plate 111 is moved to the stopper bracket 14 on the rear side of the lower end.
0,140 descends and stops until it engages with the rubber stoppers 132, 132 fixed below,
The front sides of the upper and left sides of the frame frame 115 are pressed against rubber packings 123 attached to the cab peripheral frames 103 ₁ , 103 ₂ , 103 ₃ , and the rubber packings 124 on the lower edge are pressed against the lower fixed glass 11 .
8 to seal the inside and outside of the cab as a whole. However, due to the assembly and fixation structure of the fixed glass 118 and the fact that this fixed glass 118 is set back slightly inward from the front surface of the cab, etc. As already mentioned above, some rainwater may enter the cab in part B of FIG. 13. However, in the present invention, such intruding rainwater is also drained from the taper plate portion 1 due to the presence of the pocket portion formed by the rainwater drainage bracket 128.
33 to the apron section 127, the cab interior is almost never wet by rainwater.
According to experiments, good drainage performance was confirmed not only when used under normal rainy conditions, but also when washing a car. In addition, in the present invention, the prevention of rainwater intrusion, which is a particular problem in a structure in which the horizontal crossbar at the front of the cab is omitted, can be suitably achieved not only by simply assembling the rainwater drainage bracket. Its usefulness is extremely great, as it can also be used as a member for regulating the extraction of the lower fixed glass, and can also be used as a pedestal for a stopper that determines the lowering limit of the window plate.

[Brief explanation of drawings]

The drawings are for explaining the present invention, and Fig. 1 is an overall schematic diagram of a backhoe, Fig. 2 shows a conventional cab front structure, Fig. 1 is a perspective view, and Fig. 2 is a front view. It is. Figure 3 is a front view showing the window panel structure for a fully open type front window, Figure 4 is an enlarged view of the same part, Figure 5 is a diagram explaining the movement of the window plate when the fully open type front window is opened, Fig. 6 is a diagram showing the front structure of a cab using the present invention, Fig. 7 is a front view showing the window plate structure for a fully open type front window using the present invention, and Fig. 8 A and B are enlarged views of the same parts. Figure, Figure 9~
Fig. 13 is a diagram illustrating an embodiment of the rain cover structure according to the present invention, Fig. 9 is a perspective view of a rainwater receiving bracket, and Fig. 10 is a perspective view showing a state in which the rainwater receiving bracket is attached to the cab. 11 and 12 are views showing a partial cross-sectional structure of the rain cover structure, respectively, and FIG. 13 is a partial perspective view of the front of the cab when the window board is closed. 1...crawler, 2...swivel frame, 3...
... Cab, 4, 5, 6... Hydraulic cylinder device,
7, 8...Arm, 9...Bucket, 10...Horizontal beam, 11,111...Window plate, 12,13,11
2,113...Roller, 14,114...Glass, 15,115...Frame, 16,116
...Rubber packing, 17,117...Handle, 1
8,118... Fixed glass, 19,119... Rubber packing, 12,120... Opening, 21,2
2,121,122...Guide rail, 23,1
23...Rubber packing, 124...Rubber packing, 125...Fixed frame (substantially U-shaped fixed frame), 1
26...Wall surface, 127...Apron part, 128...
...Rainwater drainage bracket, 129...Platform part, 130...Glass upper end holding part, 131
...Bending fixation part, 132...Rubber stopper, 1
33... Taper plate part, 134... Standing wall,
140...Stotsupa bracket.

Claims (1)

[Scope of Claims] 1. An opening in the front part of the cab having a shape in which a vertically intermediate part protrudes forward in a substantially dogleg shape, and a lower opening part of the opening located below the intermediate part. In this method, a fixed frame for fixing the glass is installed in a substantially U-shape along the peripheral frame at a position slightly inside the peripheral frame of the opening, and the fixed glass that closes the lower opening part is supported by this fixed frame. The upper opening part located above the middle part of the opening is provided with a window plate that can open and close the upper opening part by pulling up and down, and at the lower end of this window plate, the upper edge of the fixed glass In a cab structure in which a horizontal beam is omitted and a rubber gasket for sealing when the window plate is closed is attached, a wall-like apron portion is provided between the peripheral frame of the opening and the fixed frame to partition the inside and outside of the cab, A bracket that contacts the inner wall of the peripheral frame to form a pocket-shaped rainwater catcher is fixed to the inside of the left and right upper ends of the substantially U-shaped fixed frame, and the front end of this bracket is attached to the apron part. A cab structure for a shovel-type excavating machine characterized by having a cab structure slanted to drain intruding rainwater. 2. The cab structure for a shovel-type excavating machine as set forth in claim 1, wherein the bracket also serves as a stopper for removing the lower fixed glass. 3. The cab structure for a shovel-type excavating machine as set forth in claim 1 or 2, wherein the bracket also serves as a pedestal for a stopper that determines the lowering limit of the window plate.