Abstract: A tensioning and cut off tool for applying a strap to a bundle or to circular flexible air duct which is being joined to circular metal duct work. The tool includes a quick release operating mechanism to suddenly cut the strap when a predetermined force is applied to the handles of the tool, and further includes an adjustment means for adjusting the predetermined force for cutting the strap. An improved strap engaging mens is also disclosed that includes a discontinuous edge that engages the strap during the gripping and tensioning of the strap of minimizing the chances of a severing of the strap by the strap engaging means.

Abstract: The present invention is a tensioning and cut off tool for applying a strap having a locking collar and a free end to a bundle. It features a quick release operating mechanism that cuts the strap with a snap action in response to a certain level of tension that has been applied to the strap by the tool. It also features a resetting means for resetting the tool after the cutting action to a position where the tool can be used again. It further features a non-tension responsive cutting mechanism so that either the quick release tension related operating mechanism or the non-tension related mechanism may be selected to cut the strap.