Power window apparatus having safety unit
First Claim
1. A power window apparatus having a safety unit, comprising:
- a position sensor for detecting an opened/closed position of a window which is opened/closed by a motor to perform a pinch preventive safety control operation in accordance with the detected opened/closed position, wherein said position sensor incorporates a spiral guide fixedly disposed in a housing integrally supported by said motor;
a rotational plate arranged to be rotated along a guide surface of said spiral guide by an output shaft of said motor disposed at the center of said spiral guide and provided with a straight guide groove formed in a radial direction;
a terminal disposed at a predetermined position in said housing facing a predetermined region of said spiral guide; and
a follower supported in said straight guide groove of said rotational plate arranged to be moved along said straight guide groove while said follower is being guided by said spiral guide and brought into contact with said terminal at a predetermined movement position to enable an electric signal to be output from said terminal.
1 Assignment
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Accused Products
Abstract
A power window apparatus is provided for detecting pinching in accordance with the opened/closed position of the window and a state of rotation of a motor, the apparatus having a position sensor which detects a safety-control suspension region of the window and which is an accurate sensor. A spiral guide groove is formed in the inner surface of a housing opposite to a rotational plate which is rotated by an output shaft of a motor which opens/closes a window. A follower which is guided by the spiral guide groove is able to move along a straight guide groove provided for the rotational plate in the radial direction. Terminals in the form of conductive films are provided for a printed circuit board accommodated in the housing. When the rotational plate has been rotated, the follower is guided by the spiral guide groove so as to be moved in the straight guide groove. Thus, a slide member provided for the follower is brought into contact with the terminals so that the terminals are conducted with each other. Thus, an electric signal is output from the terminals. A safety-control suspension region can be detected with an accuracy of one-to-one correspondence to the amount of movement of the window. Moreover, a necessity of disposing the position sensor adjacent to the window can be eliminated.
54 Citations
5 Claims
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1. A power window apparatus having a safety unit, comprising:
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a position sensor for detecting an opened/closed position of a window which is opened/closed by a motor to perform a pinch preventive safety control operation in accordance with the detected opened/closed position, wherein said position sensor incorporates a spiral guide fixedly disposed in a housing integrally supported by said motor; a rotational plate arranged to be rotated along a guide surface of said spiral guide by an output shaft of said motor disposed at the center of said spiral guide and provided with a straight guide groove formed in a radial direction; a terminal disposed at a predetermined position in said housing facing a predetermined region of said spiral guide; and a follower supported in said straight guide groove of said rotational plate arranged to be moved along said straight guide groove while said follower is being guided by said spiral guide and brought into contact with said terminal at a predetermined movement position to enable an electric signal to be output from said terminal. - View Dependent Claims (2, 3, 4, 5)
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Specification