Motor-powered opening/closing apparatus for a window or door
First Claim
Patent Images
1. A motor-powered apparatus comprising:
- a motor serving as a power source for a motor-powered mechanism for opening/closing a window or door;
a constraint stop circuit comprising,a comparator having an input connected to said motor for comparing an electromotive force induced at a motor terminal of said motor with a reference voltage;
a drive transistor connected to the output of said comparator and said motor terminal and controlled to be turned on/off in response to the output of said comparator, for supplying a drive current to said motor when said electromotive force is greater than said reference voltage and cutting off said drive current when said electromotive force is less than said reference voltage;
a shut off transistor connected to the drive transistor for making the drive transistor periodically and instantaneously turn off so as to cause said comparator to periodically compare said electromotive force with said reference voltage; and
a circuit for forming the reference voltage which determines a motor torque when said motor is going to be stalled,a sensor for detecting clamping of a foreign object between a fixed frame and an edge of a window or door, said sensor being arranged on the fixed frame close to and along a contact line between the fixed frame and the edge of the window or the door; and
switching means connected to said constraint stop circuit for stopping the supply of the power to said motor or inverting a polarity of the power in response to an output from said sensor.
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Abstract
A motor-powered opening/closing apparatus includes a circuit for detecting a constrained state of a motor as a power source of a window or a door and deenergizing the motor, and a circuit for detecting clamping of a foreign object between an edge of the window or the door and a fixed frame and stopping or reversing rotation of the motor. These circuits are independently arranged to detect clamping of the foreign object with high sensitivity while a closing force at the closed position can be kept large.
33 Citations
20 Claims
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1. A motor-powered apparatus comprising:
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a motor serving as a power source for a motor-powered mechanism for opening/closing a window or door; a constraint stop circuit comprising, a comparator having an input connected to said motor for comparing an electromotive force induced at a motor terminal of said motor with a reference voltage; a drive transistor connected to the output of said comparator and said motor terminal and controlled to be turned on/off in response to the output of said comparator, for supplying a drive current to said motor when said electromotive force is greater than said reference voltage and cutting off said drive current when said electromotive force is less than said reference voltage; a shut off transistor connected to the drive transistor for making the drive transistor periodically and instantaneously turn off so as to cause said comparator to periodically compare said electromotive force with said reference voltage; and a circuit for forming the reference voltage which determines a motor torque when said motor is going to be stalled, a sensor for detecting clamping of a foreign object between a fixed frame and an edge of a window or door, said sensor being arranged on the fixed frame close to and along a contact line between the fixed frame and the edge of the window or the door; and switching means connected to said constraint stop circuit for stopping the supply of the power to said motor or inverting a polarity of the power in response to an output from said sensor. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 12, 13, 14, 15)
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2. A motor-powered closing/opening apparatus comprising:
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a motor serving as a power source for a mechanism for opening/closing a slidable window or a door; a constraint stop circuit for detecting a constrained state of said motor and stopping supply of power to said motor; said constraint stop circuit comprising, a drive transistor, connected in series between a power source and a terminal of said motor, for supplying/cutting off a motor drive current; a rotation detection transistor, connected to said terminal of said motor, for detecting an induction voltage so as to be turned on while said motor is rotated, said drive transistor being turned on to supply the power to said motor when said rotation detection transistor is turned on, said rotation detection transistor being turned off and then said drive transistor being turned off so as to power off said motor when said motor is set in a constrained state, a sensor for detecting clamping of a foreign object between a fixed frame and an edge of the slidable window or the door, said sensor being arranged on the fixed frame close to and along a contact line between the fixed frame and the edge of the window or the door; said sensor comprising a pair o f strip-sheet pressure sensing switches mounted on said fixed frame along a contact line between said fixed frame and an edge of said window or door near the contact line so as to be located inside and outside said window or door; and switching means for stopping the supply of the power to said motor or inverting a polarity of the power in response to an output from said sensor. - View Dependent Claims (11)
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10. A motor-powered closing/opening apparatus comprising:
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a motor serving as a power source for a mechanism for opening/closing a slidable window or a door; a constraint stop circuit for detecting a constrained state of said motor and stopping supply of power to said motor; said constraint stop circuit comprising, a comparator for comparing an electromotive force induced at a motor terminal with a reference voltage; a drive transistor, turned on in response to an output from said comparator, for applying a drive voltage to said motor; a shut off transistor for causing said drive transistor to periodically and instantaneously turn off, a circuit for forming the reference voltage, a sensor for detecting clamping of a foreign object between a fixed frame and an edge of the slidable window or the door, said sensor being arranged on the fixed frame close to and along a contact line between the fixed frame and the edge of the window or the door; said sensor comprises a pair of strip-sheet pressure sensing switches mounted on said fixed frame along a contact line between said fixed frame and an edge of said window or door near the contact line so as to be located inside and outside said window or door, and switching means for stopping supply of the power to said motor or inverting a polarity of the power in response to an output from said sensor. - View Dependent Claims (16, 17, 18, 19)
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20. A motor-powered apparatus comprising a motor having motor terminals serving as a power source for a motor-powered mechanism;
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a constraint stop circuit comprising, a comparator having an input connected to said motor for comparing an electromotive force induced at a motor terminal of said motor with a reference voltage; a drive transistor connected to the output of said comparator and said motor terminal and controlled to be turned on/off in response to the output of said comparator, for supplying a drive current to said motor when said electromotive force is greater than said reference voltage and cutting off said drive current when said electromotive force is less than said reference voltage; a shut off transistor connected to said drive transistor for making the drive transistor periodically and instantaneously turn off so as to cause said comparator to periodically compare said electromotive force with said reference voltage; and a circuit for forming the reference voltage which determines a motor torque when said motor is going to be stalled.
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Specification