Method of automatically controlling the opening and closing of w

Details Method of automatically controlling the opening and closing of w Method of automatically controlling the opening and closing of w

1995-09-29

1997-06-17

Ip, Paul

Electricity: motive power systems

Motor-reversing

Periodic- or intermittent-reversing

318466, 318468, E02F 916

Patent

active

056400721

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION



Field of the Invention

This invention relates to a method of automatically controlling the opening and closing of the window of the driver's cab of a working vehicle and to an apparatus for practicing the method. More particularly, it relates to a method of automatically controlling the opening and closing of the 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, and to an apparatus for practicing the method.


Prior Art

In a construction machine, such as a hydraulic shovel, crane or the like, the front door (to be referred to as "window" hereinafter) can be opened and closed for direct confirmation of the working ground, direct communication with an assistant worker, and the like. That is, guide rails extending to the top wall are provided on the window frame of the driver's cab so that the window is moved upwardly when it is removed from the window frame by pulling it from the window frame of the driver's cab toward the driver, and 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 a 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 opening and closing the window in which guide rails for moving the window up and down are provided both on the window frame and on the top wall, rollers which roll along the guide rails are provided in the four corners of the window, a driving cable provided with a wire ring to form a closed loop is connected to the window, and the window is opened and closed by the drive force of a motor for circulating the driving cable (Japanese Patent Laid-Open (A) 3-141896). 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 window is moved downwardly along the guide rails on the window frame from the top wall by the reverse rotation of the motor, pressed against the window frame by means of locking units when it reaches the terminal position of its downward movement, and tightly closed. Each locking unit 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. That is, the locking unit has a threaded rod driven by the motor, a movable nut mounted on the threaded rod, and an engaging portion moving with the movable nut and movable up and down so that the engaging portion moves down and engages with the pin provided on the window at the same time the movable nut moves in a locking operation direction.
However, since there is a small gap between the terminal position for the downward movement of the window and the shutting locking position in the locking unit, there is a possibility that, when the window reaches the terminal position of its downward movement, it vibrates and the locking operation is not performed smoothly. In other words, there is the problem that the shutting operation cannot be performed since the engaging portion of the locking unit starts the locking operation without engaging with the locking pin, due to the vibration of the window.
Further, since the driving cable has play allowance, when the window reaches the terminal position of its downward movement, slack is generated by a continu

REFERENCES:
patent: 4650242 (1987-03-01), Obe et al.
patent: 4878391 (1989-11-01), Komatsu et al.
patent: 5174066 (1992-12-01), Dupuy
patent: 5381065 (1995-01-01), Jones
patent: 5404673 (1995-04-01), Takeda et al.
patent: 5422551 (1995-06-01), Takeda et al.
patent: 5521473 (1996-05-01), Mizuno et al.

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