Power window device with safety device
First Claim
1. A safety control power window device in combination with a window glass, said safety control power window device having a motor for supplying a force for raising and lowering the window glass, said motor comprising a rotary shaft that receives a thrust load when an object is nipped by the window glass, said safety control power window device comprising:
- means for sensing the thrust load on said rotary shaft of said motor; and
nipping detecting means for detecting nipping by comparing the thrust load sensed by said means for sensing with a reference value,wherein said thrust load sensing means comprises a pressure sensor sensing a thrust pressure on said rotary shaft of said motor.
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Accused Products
Abstract
A safety control power window device which reliably detects nipping of a finger by a window and sash and which is little influenced by variations of motor characteristics of the motor used as a drive source of the power window device. The window position and a thrust pressure acting on the rotary shaft of the motor providing the force for opening and closing the window are detected. Reference pressures for detecting nipping are set according to the window position detected. By comparing the detected pressure and the reference pressures, nipping by the window is detected. Since nipping and the window position are not detected using the drive current of the motor, accurate safety control is realized, eliminating influences caused by variations of the characteristics of the motor.
45 Citations
12 Claims
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1. A safety control power window device in combination with a window glass, said safety control power window device having a motor for supplying a force for raising and lowering the window glass, said motor comprising a rotary shaft that receives a thrust load when an object is nipped by the window glass, said safety control power window device comprising:
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means for sensing the thrust load on said rotary shaft of said motor; and nipping detecting means for detecting nipping by comparing the thrust load sensed by said means for sensing with a reference value, wherein said thrust load sensing means comprises a pressure sensor sensing a thrust pressure on said rotary shaft of said motor. - View Dependent Claims (2, 3, 4, 5)
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6. A safety control power window device in combination with a window glass, said safety control power window device having a motor for supplying a force for raising and lowering the window glass, said motor comprising a rotary shaft that receives a thrust load when an object is nipped by the window glass, said safety control power window device comprising:
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thrust load sensing means for sensing the thrust load on said rotary shaft of said motor; means for detecting nipping by comparing the thrust load sensed by said thrust load sensing means with a reference value; means for sensing an opening/closing position of said window; and means for setting said reference value in response to the opening/closing position of said window sensed by said means for sensing, wherein said opening/closing position sensing means comprises a potentiometer.
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7. A safety control power window device in combination with a window glass, said safety control power window device having a motor for supplying a force for raising and lowering the window glass, said motor comprising a rotary shaft that receives a thrust load when an object is nipped by the window glass, said safety control power window device comprising:
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thrust load sensing means for sensing the thrust load on said rotary shaft of said motor; means for detecting nipping by comparing the thrust load sensed by said thrust load sensing means with a reference value; means for sensing an opening/closing position of said window; and means for setting said reference value in response to the opening/closing position of said window sensed by said means for sensing, wherein said means for setting said reference value increases said reference value in stages at a plurality of positions from a completely closed position of said window. - View Dependent Claims (8, 9)
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10. A safety control power device in combination with a window glass, said safety control power window device having a motor for supplying a force for raising and lowering the window glass, said motor comprising a rotary shaft that receives a thrust load when an object is nipped by the window glass, said safety control power window device comprising:
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a load cell attached to the rotary shaft to sense the thrust load on the rotary shaft; and nipping detecting means for detecting nipping by comparing the thrust load sensed by said load cell with a reference value.
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11. A safety control power window device in combination with a window glass, said safety control power window device having a motor for supplying a force for raising and lowering the window glass, said motor comprising a rotary shaft that receives a thrust load when an object is nipped by the window glass, said safety control power window device comprising:
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a stroke sensor sensing an amount of movement of the rotary shaft of the motor in a direction parallel to a longitudinal axis of the rotary shaft; and nipping detecting means for detecting nipping by comparing the amount of movement of the rotary shaft sensed by said stroke sensor with a reference value, wherein said stroke sensor comprises a potentiometer. - View Dependent Claims (12)
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Specification