Tensioning device for power transfer assembly
First Claim
1. A belt-type power transfer assembly having spaced apart driving and driven pulleys, endless flexible belt means interengaged between said driving and driven pulleys to transfer rotational power therebetween, and spring-loaded tensioning means operably engaged with the flexible belt means to take up the slack thereof and to maintain proper tension therein when transferring rotational power between said driving and driven pulleys, said spring-loaded tensioning means including a tension pulley rotatably mounted on a pivot arm and biasing means acting between a fixed support and the pivot arm to urge the latter with the tension pulley thereon in the direction of the flexible belt means, said biasing means including a tension rod pivotally coupled at one end to the pivot arm, the tension rod supporting at a distance therefrom abutting means, and a compression spring provided in the precompressed condition between the abutting means and the fixed support, the improvement comprising:
- stop means associated with the biasing means compression spring in said spring-loaded tensioning means for restricting the extension of said compression spring to limit the biasing movement thereof in tensioning the flexible belt means when the slack therein reaches a predetermined amount.
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Accused Products
Abstract
A belt-type power transfer assembly for driving the separating mechanism of a rotary combine harvester is disclosed wherein the assembly includes spaced apart driving and driven pulleys, an endless flexible belt interengaged between the pulleys to transfer rotational power therebetween and spring-loaded tensioning means operably engaged with the flexible belt to take up the slack thereof and to maintain proper tension therein when transferring rotational power. Stop means are associated with the spring-loaded tensioning means for restricting biasing movement thereof in the direction of the flexible belt, causing the tensioning means to act as fixedly positioned tensioning means after an initial belt tensioning movement thereof. The power transfer assembly according to the invention may be used to drive the separating mechanism of a rotary combine harvester.
8 Citations
7 Claims
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1. A belt-type power transfer assembly having spaced apart driving and driven pulleys, endless flexible belt means interengaged between said driving and driven pulleys to transfer rotational power therebetween, and spring-loaded tensioning means operably engaged with the flexible belt means to take up the slack thereof and to maintain proper tension therein when transferring rotational power between said driving and driven pulleys, said spring-loaded tensioning means including a tension pulley rotatably mounted on a pivot arm and biasing means acting between a fixed support and the pivot arm to urge the latter with the tension pulley thereon in the direction of the flexible belt means, said biasing means including a tension rod pivotally coupled at one end to the pivot arm, the tension rod supporting at a distance therefrom abutting means, and a compression spring provided in the precompressed condition between the abutting means and the fixed support, the improvement comprising:
stop means associated with the biasing means compression spring in said spring-loaded tensioning means for restricting the extension of said compression spring to limit the biasing movement thereof in tensioning the flexible belt means when the slack therein reaches a predetermined amount. - View Dependent Claims (2, 3, 4, 5, 6, 7)
Specification