Frame of metal cutting saw bow consisting of a single piece with device for tensioning of the blade

摘要

The invention concerns a frame of metal cutting saw bow consisting of a single piece comprising a bow (6) extended to its rear end by a revolver handle (3) and a protecting branch (7) and to its front end by a branch (9) comprising at its end a catching dog point (14) receiving one of the two ends of a blade (2) and comprising a tensioning device. The invention is characterised in that said blade tensioning device comprises a blade tensioning adjusting system (4), said tensioning device consisting of a lever fixed by a articulating axle (18) to a joint blade holder (8) coming in the rear part of the protecting branch (7), said articulating axle (18) constituting the rotation axis of the lever (5), said blade tensioning adjusting system (4) consisting of a blade support (12a) enabling the passage of the articulating axle (18), a threaded rod (15) being made integral permanently connected with the blade support and in articulation with the lever (5) by an articulating axle bored (17) with a smooth hole for the passage of the threaded rod on which a knurl (16) is screwed, said knurl (16) resting on the bored articulating axle (17).