JP2517514Y2 - Front window opening and closing structure of the cab - Google Patents

Description

[Detailed description of the device] [Industrial applications]

This invention is directed to a first guide rail portion that extends vertically on the front side of an operator's cab of a construction machine and a second guide rail portion that extends frontward and rearward along the ceiling side via front and rear guide rollers, respectively. The present invention relates to a front window opening / closing structure in which a window is slidably provided and opened / closed to improve an operator's upper field of view at a window closing position.

[Prior art]

FIGS. 4 and 5 show a conventional structure as a structure for opening and closing a front window having a ceiling part as a storage part in a cab of a construction machine. The left and right guide rails are composed of a first guide rail portion 15 that extends upward in front of the side surface of the inner wall surface 14 of the cab 12, and a second guide rail portion 16 that bends at its upper end and extends rearward along the ceiling portion 12a side. It is provided in a pair. The second guide rail portion 16 provides a space S for storing the front window 13 along the ceiling portion 12a when the front window 13 is opened (see FIG. 4) or the ceiling portion 12
Various devices built into a (eg motors for wipers) 2
In order to avoid 0 (see FIG. 5), each is linearly arranged at a slightly lower position.

[Problems to be solved by the device]

Therefore, when the operator in the cab looks out with the front window closed, there is a drawback in that the upper field of view of the front window is lower and the upper field of view A1 is narrow and cannot be taken sufficiently. The present invention has been devised in view of the above circumstances, and its main problem is that when the front window is closed, it can be rotated in the upright direction to displace the upper edge of the front window upward, thereby expanding the upper field of view. It is to provide a front window opening / closing structure for a driver's cab.

[Means for solving problems]

In order to solve the above-mentioned problems, in the present invention, a first guide roller that slides along a vertically extending first guide rail portion on the front side of a driver's cab, and a ceiling portion from the upper end side of the first guide rail portion. An opening / closing structure for a front window, which is attached so as to be openable / closable, having a second guide roller that slides along a second guide rail portion that extends rearward along the following: (a). An arcuate rotation guide portion is formed on the front end side of the second guide rail, (b). A technical means of making the front window in an inclined posture rotatable in the upright direction by sliding the second guide roller along the rotation guide portion with the lower end position of the first guide roller as the rotation center. I am taking it.

[Action]

The front window has a first guide roller and a second guide roller.
Further, it is slid by being guided by the second guide rail, and can be displaced between a window closing position in an upright posture and a window opening position in which the window is stored substantially horizontally along the ceiling portion. Then, when closing the front window, when the first guide roller is moved to the descending end position, the second guide roller is interlocked with this and moved to just before the turning guide portion of the second guide rail. It has a slightly inclined posture. Therefore, the second guide roller is rotated around the first guide roller at the lower end position along the rotation guide portion in the upright direction of the front window. Since the upper edge of the rotating front window is gradually displaced upward as it goes in the upright direction, the upper edge of the front window is displaced upward and the operator's upper field of view is increased as the front window is rotated closer to the upright posture from the tilted posture. Can be expanded.

【Example】

Hereinafter, a preferred embodiment in which the front window opening / closing structure for a cab according to the present invention is applied to a cab of a construction machine will be described with reference to the drawings. In the front window 3 of the operator cab 2 of the construction machine 1 shown in FIG. 1, a guide roller provided on the side of the front window 3 slides along a guide rail, and the front window 3 stands upright on the front side of the window. Can be displaced between a window closing position for closing the window and a window opening position for horizontally storing along the ceiling portion 2a. In this embodiment, the guide rail has a dovetail shape, and as shown in FIG. 2, a first guide rail portion 5 extending vertically on the front side of both left and right side walls of the inner wall surface 4 of the cab 2, and the first guide rail portion 5. The first guide rail portion 5 includes a second guide rail portion 6 which is connected to the upper end of the first guide rail portion 5 and extends horizontally rearward along the ceiling portion 2a. On the other hand, on both left and right sides of the front window 3, a first guide roller 7 is rotatably attached to a lower end side thereof and a second guide roller 8 is rotatably attached to an upper rear side thereof. The first guide roller 7 is rotatably attached to the first guide rail portion 5, and the first guide roller 7 moves up and down along the first guide rail portion 5 and stops at the lower end position P1 when the window is closed. Then retained. The second guide roller 8 is rotatably attached to the second guide rail portion 6 and moves back and forth along the second guide rail portion 6. The second guide rail portion 6 is provided with a rotary guide portion 9 extending in an arc at the front end of a horizontal guide portion 6'extending linearly. The rotation guide portion 9 has a pitch between the first and second guide rollers centered on the descending end position P1 of the first guide roller 7.
It is formed in an arc shape along the rotation locus C1 of the second guide roller 8 when the front window 3 is rotated with R1 as the radius, and the front end is the rotation end position P2 of the second guide roller 8. There is. Therefore, at the time of the closing operation of the front window 3, the second guide roller 8 becomes the starting point of the rotation guide section 9 at the front end of the horizontal guide section 6'when the first guide roller 7 reaches the descending end position P1. When the front window 3 is reached, the front window 3 is inclined at an acute angle, and from there, the front window 3 is rotated forward around the first guide roller 7 constrained at the descending end position P1, and the second guide roller 8 is rotated and guided. It is guided by the portion 9 and is rotated until it reaches the rotation end point position P2 of the front end. As a result, the front window 3 leans forward and approaches an upright posture, and its upper edge portion is displaced upward. Therefore, when the conventional second guide rail 8 remains straight and the front window 3 is tilted, the operator's upper field of view A1 is changed to an upper field of view A2 in which the upper edge of the front window 3 is displaced upward, and the improvement angle A3 It is possible to expand the upper field of view by the amount of. The rotation guide portion 9'shown in FIG. 3 shows a different embodiment having a function of fixing the front window 3. This rotation guide portion 9 ′ has the front window 3 centered around the descending end point position P 1 of the first guide roller 7 and the rotation guide portion 9 ′.
The second guide roller 8 is formed in an arc shape so as to be pressed downward at the rotation end position P2 of the second guide roller 8 when the second guide roller 8 is rotated along. That is, the rotation guide portion 9'is located at a distance C1 between the centers of the first guide roller 7 and the second guide roller 8 whose radius is the radius C1 of the second guide roller at the distance R1. With reference to the locus C2 drawn concentrically with a slightly longer length L1, the distance gradually approaches the above locus C1 toward the front and is slightly shorter than the radius of the roller, or no gap is created.
It is formed on an arc C3 that is L2. During the closing operation of the front window 3, the second guide roller 8 is the starting point of the rotation guide section 9'at the front end of the horizontal guide section 6'when the first guide roller 7 reaches the descending end position P1. After reaching P3, the front window 3 is rotated forward around the first guide roller 7 constrained at the descending end position P1, and the second guide roller 8 is rotated by the rotation guide portion 9 '.
Guided by, rotate until the rotation end position P2 at the front end is reached. Then, as the second guide roller 8 approaches the rotation end position P2, the gap between the rotation guide portion 9'and the upper end of the second guide roller 8 becomes narrower, and the second guide roller 8 reaches the rotation end position P2. Then, the wedge action presses the upper end of the second guide roller 8. Here, since the first guide roller 7 at the descending end position P1 is constrained downward in advance, the first and second guide rollers 7 and 8 are clamped vertically and fixed to constrain the front window 3. it can. Further, in this invention, the rotation guide portion may be projected forward of the first guide rail portion as in the first embodiment, or may be continuous with the upper end of the first guide rail portion as in the second embodiment. However, in the former case, the turning distance can be increased to make the forward tilt angle more upright and the field of view can be expanded. Further, in this invention, the descending end point position P1, the turning end point position P2, the periphery of the restraint guide portion 9, and particularly the portion 9A in contact with the guide roller may be made of rubber or plastic. Furthermore, the curved shape of the restraint guide portion 9, particularly the vicinity of the rotation end point position P2, may be vertically adjustable. In the above embodiment, the case where the first guide rail portion and the second guide rail portion are integrated was illustrated, but in the present invention, the first guide rail portion and the second guide rail portion are separate bodies. Good.

[Effect of device]

According to this invention, since the rotation guide portion is provided at the front end of the second guide rail for guiding the second guide roller and the front window in the inclined posture is inclined in the upright direction when the window is closed, the upper edge of the front window is raised. The operator's upper field of view can be expanded.

[Brief description of drawings]

FIG. 1 is a side view of a front window opening / closing structure for a cab of a construction machine according to an embodiment of the present invention, FIG. 2 is a side sectional view of FIG. 1, and FIG. 3 is an enlarged view of a main part of FIG. FIG. 4 is an enlarged view of an essential part showing a different embodiment in which the rotation guide part has a fixing function, and FIG. 5 is a side sectional view showing a conventional front window opening / closing structure. 1 …… Construction machinery 2 …… Operating cab 3 …… Front window 4 …… Inner wall surface 5 …… First guide rail section 6 …… Second guide rail section 7 …… First guide roller 8 …… Second guide roller 9 …… Rotation guide P1 …… Down end position P2 …… Rotation end position

Front page continued (72) Hideo Sekine Inventor Hideo Sekine 1-1-1 Shiohama, Kawasaki-ku, Kanagawa Prefecture Press Industry Co., Ltd. (72) Inventor Eiji Akabane 1-1-1 Shiohama, Kawasaki-ku, Kanagawa Prefecture Press Within Kogyo Co., Ltd. (56) Bibliographic references Sho 61-41771 (JP, U)

Claims (4)

(57) [Scope of utility model registration request] 1. A first guide roller that slides along a vertically extending first guide rail portion on the front side of the operator's cab, and a second guide roller that extends rearward along the ceiling portion from the upper end side of the first guide rail portion. In a structure for opening and closing a front window that has a second guide roller that slides along a guide rail portion and is openably and closably attached, an arc-shaped rotation guide portion is formed on the front end side of the second guide rail. In addition, the second guide roller is slid along the rotation guide portion with the lower end position of the first guide roller as the center of rotation so that the inclined front window can be rotated in the upright direction. The front window opening and closing structure of the driver's cab. 2. When the rotation guide part rotates the front window along the rotation guide part about the lowering end position of the first guide roller, the second guide roller is moved to the second end position at the rotation end position of the second guide roller.
The front window opening / closing structure of the cab according to claim 1, wherein the guide roller is set so as to be pressed downward. 3. A front window opening / closing structure for a driver's cab according to claim 1, wherein the rotation guide portion projects forward from an upper end of the first guide rail portion. 4. A front window opening / closing structure for a driver's cab according to claim 1, wherein the first guide rail and the second guide rail are integrally connected to each other or formed separately.