Garage door operator safety apparatus
DCFirst Claim
1. Apparatus for opening and closing a garage door comprising:
- a motor having a rotatable member for rotating in a first direction to open the garage door and in a second direction to close the garage door;
motor control circuitry responsive to motor control commands for selectively connecting electrical power to said motor to cause rotation of said rotatable member thereby opening and closing said garage door;
control means for selectively sending one of a plurality of motor control commands to said motor control circuitry, said motor control commands specifying one of rotation of said rotatable member in said first direction, rotation of said rotatable member in said second direction, and no rotation of said rotatable member;
means for sensing the rotation of said rotatable member after the sending of at least a predetermined one of said motor control commands; and
means for sending fault control signals to said motor control circuitry when the rotation of said rotatable member sensed by said sensing means is not in accordance with the rotation specified by said at least one predetermined motor control command.
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Abstract
A garage door opening and closing apparatus having improved operational safety is disclosed. The apparatus includes a control circuit which responds to a number of input stimuli to generate commands to open and close a garage door as well as to stop garage door movement. Three relays respond to the commands via drive circuitry to actually connect door operating voltages to the windings of a door controlling motor. By redundancies in the operation of the three relays, faults in the operation of those relays result in safe door operating conditions. Additionally, the control circuitry upon issuing a door stop command, performs a test to determine whether or not the door is still moving. If the door is still moving, door up commands are generated by the control circuitry to place the door in a safe position.
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Citations
13 Claims
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1. Apparatus for opening and closing a garage door comprising:
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a motor having a rotatable member for rotating in a first direction to open the garage door and in a second direction to close the garage door; motor control circuitry responsive to motor control commands for selectively connecting electrical power to said motor to cause rotation of said rotatable member thereby opening and closing said garage door; control means for selectively sending one of a plurality of motor control commands to said motor control circuitry, said motor control commands specifying one of rotation of said rotatable member in said first direction, rotation of said rotatable member in said second direction, and no rotation of said rotatable member; means for sensing the rotation of said rotatable member after the sending of at least a predetermined one of said motor control commands; and means for sending fault control signals to said motor control circuitry when the rotation of said rotatable member sensed by said sensing means is not in accordance with the rotation specified by said at least one predetermined motor control command. - View Dependent Claims (2, 3, 4)
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5. Apparatus for raising and lowering a door comprising:
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a source of motor driving voltage; a motor having an up winding which, when energized by said motor driving voltage, raises said door and a down winding which, when energized by said motor driving voltage, lowers said door; control means for generating control signals defining door movement; first switching means responsive to said control signals during fault free operation for selectively connecting said motor driving voltage to said up winding or to an intermediate conductor; second switching means responsive to said control signals during fault free operation for selectively connecting said intermediate conductor from said first switching means to said down winding; and third switching means responsive to said control signals during fault free operation for selectively connecting said motor driving voltage to said up winding; wherein said control means comprises means for generating a downward movement control signal specifying the connection by said first switching means of said motor driving voltage to said second switching means by said intermediate conductor, the connection by said second switching means of the motor driving voltage from said intermediate conductor to said down winding and no connection by said third switching means between said motor driving voltage and said up winding. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. Apparatus for raising and lowering a door comprising:
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a source of motor driving voltage; a motor having an up winding which, when energized by said motor driving voltage, raises said door and a down winding which, when energized by said motor driving voltage, lowers said door; control means for generating control signals defining door movement; first switching means responsive to said control signals during fault free operation for selectively connecting said motor driving voltage to said up winding or to an intermediate conductor; second switching means responsive to said control signals during fault free operation for selectively connecting said intermediate conductor from said first switching means to said down winding; and third switching means responsive to said control signals during fault free operation for selectively connecting said motor driving voltage to said up winding; wherein said second and said third switching means each comprise a normally open single throw relay contact set and said first switching means comprises a double throw relay contact set having an armature contact connected to said source of motor driving voltage, a normally open contact connected to said up winding and a normally closed contact connected via said intermediate conductor to one contact of said second switching means.
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Specification