US 6,326,751 B1Granted

System and related methods for detecting and measuring the operational parameters of a garage door utilizing a lift cable system

AssigneeWayne-Dalton Corp.

InventorsWillis J. Mullet, Yan Rodriguez, Donald B. Kyle

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Abstract

An internal entrapment system for a garage door operator (30), comprising a motor (48) for transferring a garage door (12) between first and second positions; a pulse counter (62) for detecting a speed of the garage door (12) during transfer between first and second positions; a potentiometer (56) for determining a plurality of positional locations of the garage door (12) during transfer between first and second positions separate from said pulse counter (62); and a control circuit (50) for calculating a motor torque value from the speed for each of said plurality of positional locations to compare with a plurality of door profile data points, wherein said control circuit (50) takes corrective action if the difference between the motor torque value for each of said plurality of positional locations and said plurality of door profile data points exceeds a predetermined threshold, and wherein said control circuit (50) updates said plurality of door profile data points to the motor torque values for each respective said plurality of positional locations if the predetermined threshold is not exceeded. In another embodiment both speed and position are detected by a slider element (58) which is connected to the control circuit (50). A closed loop lift cable system (100) may be employed for use with the internal entrapment system. The system (100) utilizes a lift cable (164) connected between a bottom section of the door and a drum mechanism (150) and an upper cable connected between a top section of the door and the drum mechanism (150). A tension device (180, 200) ensures that the door and cables act as one and thus allow closed loop control of the door.

Claims11

Dependent claims

An internal entrapment system for a garage door controlled by a garage door operator, comprising:

a counter-balancing system for transferring the garage door from a first to a second position, wherein said counter-balancing system includes a motor with a drive shaft that drives the door between said first position and said second position;
said counter-balancing system further comprising at least one cable drum connected to said drive shaft;
at least one lift cable having one end connected to a bottom section of the garage door and an opposite end connected to said cable drum;
at least one upper cable having one end connected to a top section of the garage door and an opposite end connected to said cable drum, wherein said lift cable and said upper cable are under tension as the door is transferred between positions;
a tensioning device connected between said upper cable and said cable drum, said tensioning device facilitating the application of a constant tension force on said upper cable during door transfer, wherein said tensioning device comprises:
a hinge bracket secured to said top section;
a pivotable member coupled to said hinge bracket by a pin, wherein said pivotable member pivots about said pin and said pin is at a top edge of said top section when the door is in a closed position;
and
a spring connected between said pivotable member and said upper cable, wherein said pivotable member rotates as needed during door transfer;
means for detecting a speed of the garage door during transfer between first and second positions solely from said drive shaft;
means for determining a plurality of positional locations of the garage door during transfer between first and second positions, wherein said determining means is separate from said detecting means;
and
controller means for calculating a motor torque value from said detecting means for each of said plurality of positional locations from said determining means to compare with a plurality of door profile data points, wherein said controller means takes corrective action if the difference between the motor torque value for any one of said plurality of positional locations goes beyond a predetermined threshold for a respective one of said plurality of door profile data points, otherwise said controller means updates said plurality of door profile data points to the motor torque values for each respective said plurality of positional locations.

10 more elements

An internal entrapment system used with a closed loop garage door operator for at least stopping motion of a sectional garage door during a closing or opening cycle when the door is interfered with by an obstruction, comprising:

a motor;
a drive shaft coupled to said motor, said drive shaft having opposed ends;
a cable drum connected to each end of said drive shaft;
a lift cable connected to each said cable drum at one end, an opposite end of each said lift cable connected to a bottom section of the garage door;
an upper cable connected to each said cable drum at one end, an opposite end of each said upper cable connected to a top section of the garage door, said motor rotating said drive shaft in one direction to reel in said lift cable while letting out said upper cable during the opening cycle and said motor rotating said drive shaft in an opposite direction to reel in said upper cable and let out said lift cable during the closing cycle;
a potentiometer coupled to either said motor or said drive shaft to detect a plurality of speed values of the moving garage door and to set an upper and a lower limit of door travel, wherein said potentiometer includes a slider element coupled to the door which generates a voltage value that is directly proportional to the door position to establish said upper and lower limits of door travel, and wherein said voltage value changes depending upon the door position and wherein said slider element remains in place even if a power supply is removed from said potentiometer;
a processor with memory to store said plurality of speed readings, said processor calculating a plurality of force values from said plurality of speed values between the upper and lower limits and taking corrective action by controlling said motor when said processor detects that a force applied by said drive shaft is beyond a predetermined threshold;
a tensioning device connected between each said upper cable and each said cable drum, said tensioning device facilitating the application of a constant tension force on said upper cable during door transfer, wherein said tensioning device includes a pair of hinge brackets secured to said top section;
a pivotable member coupled to each said hinge bracket at a top edge of said top section when the door is in a closed position;
and
a spring connected between each said pivotable member and said upper cable, wherein said pivotable member rotates as needed during the closing or opening cycle.

8 more elements

Dependencies are inferred from the claim text.