Movable or removable closures – Time controlled
Patent
1996-01-23
1998-09-08
Redman, Jerry
Movable or removable closures
Time controlled
49 28, 49506, 49360, E05F 1520
Patent
active
058027661
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to improvements in a method and apparatus for controlling the automatic opening and closing of a window of the driver's cab of a working vehicle, which is suitable for the opening and closing of the front window of the driver's cab of a construction machine such as a hydraulic shovel, crane or the like.
BACKGROUND OF THE INVENTION
In a construction machine such as a hydraulic shovel, crane or the like, the front window can be opened and closed because the glass of the front window (to be referred to as "window" hereinafter) makes it difficult to see objects outside the driver's cab, communication with an assistant worker is necessary, and so on. That is, guide rails, extending from the window frame to the top wall (ceiling) of the driver's cab, are provided so that the window is moved upwardly as it is moved away from the window frame, by pulling it from the window frame toward the driver, and then is moved along the guide rails until it becomes parallel to the top wall. This operation is performed manually by the driver, holding one of the grips provided on the top and bottom of the window.
Since the weight of the window is about 20 kg, it is not easy for the driver to open and close the window. Further, as each guide rail is shaped almost like a turned letter L, it is difficult to move the window smoothly along the bent portion of the guide rail, and the driver must open and close the window in an unnatural posture. Therefore, the inventors of the present invention have proposed an apparatus for automatically opening and closing this type of window (refer to JP(A)4-36519).
In the above apparatus, guide rails for moving the window vertically are provided both on the window frame and on the top wall, rollers which roll along each of the guide rails are provided at the four corners of the window, a driving cable provided with a wire ring is connected to the window, and the window is opened and closed by the drive force of a motor for circulating the driving cable. The opening operation of this window is accomplished as follows. A motor driving switch is first turned on to rotate the motor, and the window is pulled upwardly by the driving cable and stored in the guide rails on the top wall. The closing operation of the window is accomplished as follows. The cable is driven by the reverse rotation of the motor so that the window is moved downwardly along the guide rails on the window frame from the guide rails of the top wall. Particularly, when the window is closed, locking units are used to press the window against the window frame and shut it after the window is moved downwardly to face the window frame. Each of the locking units is structured such that it engages with a locking pin, provided on the window, only at the time of locking so that it does not interfere with the movement of the window during the window opening and closing operations.
In this type of automatic opening and closing mechanism, it is necessary to carry out the detection of the window opening or closing end position properly at the time of opening or closing the window and to surely detect the locking stop position or the locking release position of the locking units at the time of locking or releasing the window. However, technical matters related to these have not been disclosed in the automatic opening and closing mechanism of the prior art. In this case, it is conceivable to use a limit switch as a detection element, but an excessive load may be applied to the limit switch, depending on its set position. If the detection depends on the limit switch only, there is the possibility of causing damage to the driving motor due to the application of an overload on the driving system.
SUMMARY OF THE INVENTION
In view of the above problem of the prior art, it is an object of the present invention to provide a method and apparatus for controlling the automatic opening and closing of a window of the driver's cab of a working vehicle in which the automatic opening, closing and locking opera
REFERENCES:
patent: 3992816 (1976-11-01), Skahill
patent: 4621223 (1986-11-01), Murakami et al.
patent: 4634945 (1987-01-01), Takemura et al.
patent: 4641067 (1987-02-01), Iizawa et al.
patent: 5018303 (1991-05-01), Koura et al.
patent: 5203112 (1993-04-01), Yamagishi et al.
patent: 5557887 (1996-09-01), Fellows et al.
Miyazaki Masamichi
Nagata Yoshihiro
Kabushiki Kaisha Komatsu Seisakusho
Redman Jerry
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