Method and apparatus for controlling tension in a strap loop

Details Method and apparatus for controlling tension in a strap loop Method and apparatus for controlling tension in a strap loop

B - Operations, Transporting

65

B

B65B 13/22 (2006.01) B65B 13/02 (2006.01)

Patent

CA 2052352

METHOD AND APPARATUS FOR CONTROLLING TENSION IN A STRAP LOOP ABSTRACT OF THE DISCLOSURE A method and apparatus is provided for tensioning a strap loop about an object and terminating the tensioning of the strap loop at a predetermined loop tension. The object is encircled with a loop of strap having a predetermined thickness, width, and coefficient of friction. A leading end portion of the strap is restrained while disposing a trailing portion of the strap adjacent a traction wheel that is rotatable about a first axis at a predetermined maximum available torque. A pressing member that is pivotable about a second axis oriented parallel to the first axis and that has a predetermined configuration and coefficient of friction is biased toward the traction wheel to press the strap trailing portion against the traction wheel. The traction wheel is rotated about the first axis to grip the strap and slide the strap along the pressing member for tensioning the strap loop while permitting the sliding friction force imposed on the pressing member to pivot the pressing member further toward the fraction wheel to further compress the strap between the traction wheel and pressing member to increase the sliding friction resistance force on the strap and overcome the tangential force imposed upon the strap by the traction wheel at the maximum available torque to terminate the traction wheel rotation at the predetermined loop tension.

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