Telescopic protective shield for following the movements of a moving part

A protective cowling for a machine-tool output device movable along two axes X and Y in a vertical plane, comprising at least three superposed elements disposed parallel to the plane of displacement of the movable device and guided by at least two pantographs having end points joined in articulated manner to a first element and to a third element of the at least three superposed elements, the pantographs further having intermediate points joined to a movable intermediate element, such that a displacement of the third element brings about a proportional displacement of the intermediate element, in which said at least three superposed elements comprise respective non-enclosing panels, wherein:

• the first element is fixed relative to the frame and is provided with a first window for motion of the movable device,
• the intermediate element slides relative to the first element along the two displacement axes X, Y, has dimensions overlapping those of the window of the first element and is provided with a second window for motion of the movable device,
• the third element is movable and has dimensions substantially larger than those of the first window and carries said movable device,
• said cowling ensures tight sealing of the open front face of a housing accommodating drive devices of the movable device,
• said fixed first panel is disposed outside the housing and said movable third panel is disposed inside said housing,
• and, finally, the pantographs are situated in the vertical upper half-plane of the first panel, in such a way that said intermediate panel can be kept suspended at the intermediate points of said pantographs.