Drive assembly with dynamic tensioning device
First Claim
1. A drive assembly for a closed loop flexible drive member system in which a flexible drive member drives a door or the like back and forth and in which the flexible driver member 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 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.
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Accused Products
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.
19 Citations
13 Claims
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1. A drive assembly for a closed loop flexible drive member system in which a flexible drive member drives a door or the like back and forth and in which the flexible driver member 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 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. - View Dependent Claims (2, 3, 12, 13)
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4. A drive assembly for a closed loop system in which a flexible drive member drives a door or the like back and forth and in which the flexible drive member 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 flexible drive member, 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 (5, 6, 7)
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8. A drive assembly for a closed loop system in which a flexible drive member drives a door or the like back and forth and in which the flexible drive member is wrapped around a drive pulley and an idler pulley that is spaced from the drive pulley, the drive assembly 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 (9, 10, 11)
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Specification