Patent FR-2972377-A1 (FR)
Title: Arrangement for making sealed light rays from laser and laser welding installation, comprises assembly mounted in window of fixed wall around pivot axis and unit for closing the window when the assembly is present in predetermined position
Inventor: ROBERT STEPANE
IPC: B23K26/42
Filed: 2011-03-07
Abstract: The arrangement comprises an assembly pivotally mounted in a window of a fixed wall around a pivot axis extending in a plane of the window in a predetermined position, a unit for closing the window when the assembly is present in the predetermined position, and a unit for closing openings of light leakage between the edges of the window and the surfaces of the pivot assembly, which are movable relative to the edges of the window. The closing unit includes traps placed on the fixed wall outside of the window at the opening. The arrangement comprises an assembly pivotally mounted in a window of a fixed wall around a pivot axis extending in a plane of the window in a predetermined position, a unit for closing the window when the assembly is present in the predetermined position, and a unit for closing openings of light leakage between the edges of the window and the surfaces of the pivot assembly, which are movable relative to the edges of the window. The closing unit include traps placed on the fixed wall outside of the window at the opening so as to be pivotable between a closed position of the opening when the pivot assembly is present in the predetermined position and a retracted position allowing the pivoting of the pivot assembly, and a unit for controlling automatic pivoting of the traps towards its closed position and its retracted position. The control unit comprises: a lever integral with the rotation of the traps; an element that is integral with the pivot assembly and is arranged to abut against the lever and to rotate the traps in the closed position when the pivot assembly is present in the predetermined position; and a unit for returning the traps towards its retracted position when the lever and the element connected to the pivot assembly are disengaged from each other. The pivot assembly comprises a working plate, a protective shield upstanding from the plate and passing through the pivot axis to close the window along its edges when the pivot assembly is present in the predetermined position, and a circular element that is placed at a top of the protective shield and is integral with the protective shield. The traps associated with the openings are arranged so as to close the openings between the edges of the window and the peripheral surface portions of the plate, which moves relative to the edges of the pivot assembly. The circular element has a peripheral surface movable relative to a cylindrical cover of an upper bearing. The traps are arranged below and above the window. Each of the traps comprise three portions extending from each other so that outer counter lines of the portions is parallel to the pivot axis of assembly formed by the circular element and the cylindrical cover, where the three portions include: a first portion is integral with the pivot axis of the traps and extends parallel to the fixed wall when the trap is present in closed position; a second portion forms an obtuse angle with the first portion away from the fixed wall; and a third portion formed by an end portion of an edge of the second portion folded to bear by its vertical edge. The closing unit further comprises projecting flanges secured to the edges of the shield and formed with the edges of the window, and baffles preventing light from passing when the pivot assembly is present in its predetermined position. The trap returning unit comprises restoring springs.