Drive assembly with dynamic tensioning device
First Claim
Patent Images
1. A drive assembly for a closed loop cable system in which a cable drives a moveable structure back and forth and in which the cable is wrapped around and driven by a drive pulley, the drive assembly comprising:
- the drive pulley,a motor unit having a motor shaft that rotates around a drive axis for rotating the drive pulley around a drive pulley axis, anda tensioning mechanism that adjusts the position of the drive pulley axis with respect to the drive axis responsive to tension in the cable.
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Abstract
A drive assembly for a closed loop cable system in which a flexible driver member drives a door or the like back and forth has the flexible drive member wrapped around and driven by a drive pulley. The drive assembly includes a motor unit having a motor shaft that rotates about a drive axis for rotating the drive pulley about a pulley axis, and a tensioning mechanism for adjusting the position of the pulley axis with respect to the drive axis responsive to tension in the flexible drive member.
24 Citations
18 Claims
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1. A drive assembly for a closed loop cable system in which a cable drives a moveable structure back and forth and in which the cable is wrapped around and driven by a drive pulley, the drive assembly comprising:
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the drive pulley, a motor unit having a motor shaft that rotates around a drive axis for rotating the drive pulley around a drive pulley axis, and a tensioning mechanism that adjusts the position of the drive pulley axis with respect to the drive axis responsive to tension in the cable. - View Dependent Claims (2, 3, 4, 5)
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6. A drive assembly for a closed loop system in which a cable drives a moveable structure back and forth and in which the cable is wrapped around and driven by a drive pulley the drive assembly comprising:
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a motor unit having an output shaft rotatable about a drive axis for rotating the drive pulley about a pulley axis, and a tensioning mechanism for adjusting the position of the pulley axis of the drive pulley with respect to the drive axis of the output shaft of the motor responsive to tension in the cable, the tensioning mechanism including a first gear driven by the motor about the drive axis, and a second gear meshing with the first gear and driven about the pulley axis of the drive pulley. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A cable drive assembly for a closed loop system in which a cable drives a moveable structure back and forth and in which the cable is wrapped around a drive pulley and an idler pulley that is spaced from the drive pulley, the cable drive system comprising:
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the drive pulley being rotatable about a pulley axis, a motor unit having an output shaft rotatable about a drive axis for rotating the drive pulley about the pulley axis, and a tensioning mechanism for adjusting the position of the pulley axis of the drive pulley with respect to the drive axis of the output shaft of the motor unit, the tensioning mechanism including a first gear driven by the motor unit about the drive axis, and a second gear meshing with the first gear and driven about the pulley axis of the drive pulley by the first gear. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A drive assembly for a closed loop cable system in which a cable is wrapped around and driven by a drive pulley, the drive assembly comprising:
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the drive pulley, a motor unit having a motor shaft that rotates about a drive axis for rotating the drive pulley about a drive pulley axis, and a tensioning mechanism for adjusting the position of the drive pulley axis with respect to the drive axis responsive to tension in the cable, the tensioning mechanism including a first gear driven by the motor about the drive axis, and a second gear meshing with the first gear and driven about the drive pulley axis of the drive pulley.
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Specification