JP3409379B2 - Cab front window opening and closing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front window opening / closing device for a cab for a cab mounted on a construction machine such as a hydraulic shovel or a working vehicle. 2. Description of the Related Art FIG. 7 shows a prior art (Japanese Patent Laid-Open No. Hei 3-2396).
28 is an exploded perspective view of a front window opening and closing device (disclosed in Japanese Patent Publication No. 28). In the figure, 1 is a front window, 2 is an upper roller mounted on both side portions of the upper portion of the front window 1, 3 is a lower roller,
Indicates a cable, 5 indicates a cable guide rail, 6 indicates a drive motor, and a virtual line A indicates a storage position of the front window 1. As shown in FIG. 7, by driving the drive motor 6, the front window 1 is moved.
Can be automatically opened and closed. [0003] In the front window opening and closing device of the prior art, the front end of the cable is connected to the lower ends of the left and right sides of the front window to form a so-called underdrawing structure. In this structure of pulling down, when performing the opening operation of the front window, the front window tilts in the vertical left-right direction and the front-back direction, and the front window is twisted with respect to the roller guide rail. As a result, the sliding resistance and noise increase, and the condition is poor. In addition, since the cable guide rail is disposed near the lower end of the front window closing position, the length of the cable guide rail and the cable itself are long, and the sliding resistance is large. As a result, the load on the drive motor increases, so that the capacity of the drive motor is considerably increased. Further, when being extended cable guide rails on the left and right sides of the front window closed position, since significantly more dust from adhering to that part, must also provide a dust seal was uneconomical. An object of the present invention is to provide a front window opening and closing device that can solve the above problems. According to the present invention, a front window is provided at a front portion of a cab, and left and right roller guide rails are provided in parallel with an inner wall surface of the cab. A cable guide rail is arranged along the front window, and the front window having rollers guided along the roller guide rail at four corners is driven by a power source through a cable passing through the cable guide rail, and the front of the cab is provided. In a front window opening and closing device that is moved between a front window closing position and a front window storage position on the inner surface side of a cab ceiling to open and close, a front window is formed so as to have a curved surface in a side view. In addition , a shaft hole is drilled at one end at the upper end on both the left and right sides of the front window.
The upper row attached to the upper side of the front window with respect to the shaft hole
The front end of the cable is inserted at the other end.
The connected connecting plate is provided, and the front end position of the cable guide rail is set near the connecting position of the front window at the front window closing position. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of a main part showing a front window opening / closing device of the present invention. In the figure, 7 is a cab, 8 is a front window, 9 is an upper roller provided on the left and right side surfaces of the front window 8, 10 is a lower roller, 11 is a roller guide rail disposed on the left and right inner wall surfaces of the cab 7, 12 is a cable guide rail, 13
Is a cable, 14 is a drive motor for winding and rewinding the cable 13, 15 is a lock motor for locking the front window 8 in the open / close position, and 16 is a connecting plate provided at the upper right and left ends of the front window 8. is there. FIG. 2 shows the cable 13 in FIG.
FIG. In the figure, reference numeral 7 indicated by a virtual line
Denotes a cab, reference numeral 11 indicated by a broken line denotes a roller guide rail on the left side, and reference numeral 12 denotes a cable guide rail by a chain line. FIG. 3 is a detailed view of a portion A in FIG. In the figure, reference numeral 17 denotes a cable terminal stopper, reference numeral 18 denotes a front end of the cable guide rail 12, and reference numeral 19 denotes a roller shaft of the upper roller 9. FIG. 4 is a view showing the connecting plate 16 in FIG. In the drawing, reference numeral 20 denotes a shaft hole for inserting a roller shaft (19) formed in one end of the connecting plate 16, and reference numeral 21 denotes a stopper hole for fitting the cable terminal stopper 17. FIG. 5 is a cross-sectional view of FIG.
FIG. 4 is a cross-sectional view of a main part viewed from B. FIG. 6 is a cross-sectional view of a main part taken along line CC in FIG. In the drawing, a dimension p is a distance between the centers of the roller guide rail 11 and the cable guide rail 12. Next, the structure of the front window opening and closing device of the present invention is shown in FIG.
6 will be described. In the present invention, the front window 8 is formed so as to have a curved surface in a side view (for example, an arc shape having a considerably large radius of curvature R as shown in FIG. 1). A connection plate 16 is provided on the front surface of the front window 8, and a shaft hole 20 (shown in FIGS. 4 to 6) is formed in one end of the connection plate 16. The roller shaft 19 of the roller 9 is fitted and inserted, and a stop hole 21 is formed in the other end of the connecting plate 16 to form the stop hole 2.
The front end portion of the cable 13 was connected to the cable terminal stopper 17 and the cable terminal stopper 17. Then, the position of the surface end 18 of the cable guide rail 12 is adjusted by connecting the front window 8 at the front window closing position (the position shown in FIGS. 1 and 2 with the front window 8 closed to the front of the cab 7). 16) It was set near the mounting position. Next, the operation of the front window opening and closing device of the present invention will be described. When the drive motor 14 is operated to open the front window 8 in the closed state, the lock motor 15 (FIGS.
Is automatically released, and winding of the cable 13 is started. One end of the connecting plate 16 connecting the front window 8 and the cable 13 is rotatably inserted into the roller shaft 19 of the upper roller 9, so that when the cable 13 is wound up, the roller guide rail 11 and the cable are connected. With the distance p between the centers of the guide rails as an offset amount, the upward pulling operation of the front window 8 is performed without being twisted. Therefore, it is not necessary to attach, for example, a roller (not shown) for preventing kinking or a special connection roller for maintaining the offset amount (p). Further, since the front window 8 is pulled upward, the front window 8 does not become vertically left-right or tiltable, so that there is no twisting and sliding resistance and noise are reduced. This uppering operation has the same effect when the front window 8 is opened and closed. In the present invention, since the position of the front end 18 of the cable guide rail 12 is set near the attachment position of the connecting plate (16) of the front window 8 at the front window closing position, the lengths of the cable guide rail 12 and the cable 13 are minimized. Can be. Therefore, the sliding resistance of the cable 13 is significantly reduced, the load on the drive motor 14 is reduced, and noise at the time of opening and closing the front window (8) can be reduced. In the prior art front window opening / closing device, the front end of the cable is connected to the lower ends of the left and right sides of the front window. In addition, it becomes inclined to move in the front-rear direction, causing twisting. Moreover, since the cable guide rails and the cables are arranged so as to reach near the lower end of the front window closing position, sliding resistance and noise when opening and closing the front window are increased, and the condition is poor.
But the window before the present invention, formed as a side view is curved curved surface, also the upper end portions of the left and right sides of the front window, one end
A shaft hole is drilled, and the upper side of the front window is
The roller shaft of the upper roller attached to the part is inserted and
A connecting plate to which the front end of the cable is connected is provided, and the front end position of the cable guide rail is set near the connecting position of the front window at the front window closing position.
That is, since the connecting plate connecting the front window and the cable has one end rotatably fitted to the roller shaft of the upper roller, the distance between the center of the roller guide rail and the center of the cable guide rail when the cable is wound up. Can be used as the offset amount to perform the upward pulling operation of the front window without being twisted. Therefore, in order to maintain the above-mentioned offset amount, it is not necessary to attach a separate anti-strain roller. Further, since the front end position of the cable guide rail is set near the connecting position of the front window at the front window closing position, the length of the cable guide rail and the cable can be minimized. Therefore, the sliding resistance at the time of opening and closing the front window is reduced, so that the noise can be reduced and a small drive motor having a small capacity can be mounted. Since the cable guide rail and the cable do not exist on the left and right sides of the front window at the front window closing position, there is no trouble of dust adhesion at that portion, and there is no need to provide a dust seal. Therefore, the front window opening / closing device of the present invention has a simple structure, is easy to assemble, and can be manufactured at low cost. Further, the sliding resistance at the time of opening and closing the front window can be reduced to improve the maintainability, and the noise at the time of opening and closing can be reduced to enhance the driving comfort.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a main part side view showing a front window opening / closing device of the present invention. FIG. 2 is a configuration diagram of a cable routing in FIG. 1; FIG. 3 is a detailed view of a portion A in FIG. 1; FIG. 4 is a view showing a connecting plate in FIG. 3; FIG. 5 is a cross-sectional view of a main part taken along line BB in FIG. 3; FIG. 6 is a cross-sectional view of a main part viewed from CC in FIG. 3; FIG. 7 is an exploded perspective view of a conventional front window opening / closing device. [Description of Signs] 1,8 Front window 2,9 Upper roller 3,10 Lower roller 4,13 Cable 4,12 Cable guide roller 6,14 Drive motor 7 Cab 11 Roller guide rail 16 Connecting plate 17 Cable terminal stopper 18 Front end 19 Roller shaft 20 Shaft hole 21 Stop hole

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B60J 1/00 B60J 1/04 E02F 9/16 E05D 15/58

Claims (1)

(1) A front window is provided at a front portion of a cab, and left and right roller guide rails are provided in parallel with an inner wall surface of the cab. A cable guide rail is provided, and the front window having rollers guided at the four corners along the roller guide rail is driven by a power source through a cable passing through the cable guide rail, and the front window on the front of the cab is provided. In a front window opening and closing device that is moved between a closed position and a front window storage position on the inner surface side of the cab ceiling to open and close, the front window is formed so as to have a curved surface in a side view, At the upper right and left sides of the front window ,
A shaft hole is drilled at one end, and the shaft hole
The roller shaft of the upper roller attached to both sides is inserted and
At the other end, a connecting plate to which the front end of the cable is connected is provided,
A front window opening and closing device, wherein a front end position of the cable guide rail is set near a connecting plate mounting position of the front window at the front window closing position.