Abstract:
A nozzle removes by suction dust and chips from a drilling machine in an industrial plant. The nozzle has a first tubular portion for connection to a suction tube communicating with an opposite second tubular portion with an intake opening. An outer flange extends transversely from an intermediate position between the first and second tubular portions. The intake opening is directed in a lateral direction, parallel to the transverse direction of the flange. A magnetic element is incorporated in the flange. The nozzle can be applied to a drilling template having cylindrical through-openings in which respective bushings made of ferromagnetic material are fixed. When the second tubular portion is inserted through a cylindrical bushing, the magnetic element acts on the bushing, opposing axial and rotational movements of the nozzle.

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to a suction spout or nozzle suitable for connection to equipment for drilling carbon-fiber reinforced resin and/or titanium or alluminum plates. The invention is applicable to industrial installations for removing dust by means of suction, in particular, but not exclusively, in the aircraft manufacturing field. 
     According to the prior art, in order to form holes in plates and parts made of carbon-fiber reinforced resin, the boring machine tools (drills) are associated with drilling templates consisting of plates in which multiple through-openings are formed. These openings define predetermined locations wherein the holes are to be formed through one or more carbon-fiber reinforced resin plates, which may be arranged on top of each other. 
     In the aircraft construction sector, for example for the construction of large-size structural parts such as stabilizers, on occasions it is required to provide a plurality of holes in plates arranged horizontally, by operating from below. From this position, which is uncomfortable from an ergonomic point of view, the operator is conventionally obliged to operate the drilling from below and at the same time must manually hold a pipe for suction and removal of the dust and chips which are produced by drilling. The presence of a second operator who assists the first operator may be required in order to hold the suction pipe. 
     SUMMARY OF THE INVENTION 
     The object of the invention is to overcome the above mentioned drawback, optimizing and making as efficient and as easy as possible the operations of removing the dust and chips resulting from drilling, with a suction system. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The features and advantages of the invention will become clear from the following detailed description of an exemplary embodiment thereof with reference to the accompanying drawings provided by way of a non-limiting example, in which: 
         FIG. 1  is a partially cross-sectioned isometric view, which shows a step of a method for drilling and removing the dust with the suction system, in which a nozzle or magnetic spout system is used; 
         FIG. 2  is an isometric view of a drilling template in which a suction spout connected to a hose for removal of the dust and chips, resulting from the drilling operation, is applied; 
         FIG. 3  is a front view of a spout or nozzle according to an embodiment of the invention; 
         FIG. 4  is a cross-sectional view along the line IV-IV of  FIG. 3 ; and 
         FIG. 5  is a schematic, perspective, partly cut-away view of the spout according to  FIGS. 3 and 4 . 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Initially referring to  FIGS. 1 and 2 , the number  10  designates a drilling template (or drilling jig) in which a plurality of cylindrical through-openings  11  are formed. A cylindrical bushing  12  made of iron or steel is fixed inside each opening  11  and is the seat for a stable and precise drilling device  13  in a position axially aligned with the axis of the bushing  12  and the opening  11 . Two screws  15  are fixed close to each bushing  12 , on the drilling template surface  14  situated on the side where the drilling machine is applied, i.e. on the surface called in this document the “accessible” surface of the template. The screws  15 , which are positioned in a diametrical opposite position respect to the edges of the bushing and project out of the surface  14 , are used to fixed the drilling machine for as long as drilling is performed in the same position of the bushing. Each bushing has a flange  16 , which is on the accessible surface  14  of the drilling template  10 . Both the drilling machine and the drilling template shown in  FIGS. 1 and 2  are known in the art and therefore are not described here in greater detail. In the remainder description, only the elements of specific interest for the purposes of implementing the invention will be described. For the design of the parts and elements not shown or described in detail reference may be made to any industrial drilling system of the known type. 
     The bushings  12 , in addition to acting as seats for the drilling motor, are also used as seats for positioning a suction nozzle  20  which can be connected to a suction apparatus or system (not shown) for removing the chips and dust which are produced during the drilling operation. 
     In the preferred embodiment, the nozzle  20  has an overall tubular cylindrical shape with a straight axis and includes a terminal portion  21  with a tubular cylindrical wall, which is inserted through the bushing  12  so as to project beyond the opposite surface or side  17 , referred to herein as “non-accessible” side, of the drilling template  10 . Considering the direction of the suction flow of the nozzle, in this context the terminal portion  21  is also called “upstream” portion, while the opposite end portion of the nozzle, denoted by the reference number  22 , is called “downstream” end portion. 
     In the operating condition, the portion  22  of the nozzle arranged downstream projects beyond the surface  14  (or “accessible” side) of the template. The portion  22  with a tubular cylindrical shape has externally a series of annular fishbone reliefs  23  for connection to a suction tube or hose  18  of the plant suction system ( FIG. 2 ) leading to the fixed suction system (not shown). 
     Externally, about halfway along its length, the nozzle  20  in the example shown has a flange  24  which projects in a radially external direction and is intended to bear against the accessible surface  14  of the drilling template. The bearing surface of the flange  24  ensures that, in the operating position, the end of the nozzle which projects beyond the non-accessible surface  17  of the template is situated at a suitable distance both from the non-accessible surface  17  of the template and from the facing surface  19  of the plate  30  which is being drilled, in order to suck up in an optimum manner the dust and chips produced by drilling. 
     The nozzle  20  incorporates a permanent magnet  25 , in this example with an annular shape, which allows the nozzle to be engaged and retained in a stable and removable manner upon the ferromagnetic bushing  12 , in the condition where the flange  24  bears against the outer surface  14  of the drilling template. It will be noted that, when the nozzle is in the assembled condition on the drilling template ( FIG. 1 ), the magnet  25  is in contact with the bushing  12 , in particular with the flange  16  therefore. 
     In the embodiment shown, the annular magnet  25  is fixed inside a corresponding annular circular groove  26  which is formed in the flange  24 . The locking or retaining action produced by the magnet  25  has the function of both preventing removal of the nozzle from the template in the axial direction (i.e. away from the drilling template) and maintaining the angular orientation of the nozzle in a plane parallel to the main surfaces  14 ,  17  of the drilling template. In other words, the magnet  25  keeps the nozzle in the chosen angular position around the axis of the bush. The capacity of the nozzle to assume and maintain a given angular orientation is important for directing the suction flow towards the drilling zone (indicated by A in  FIG. 1 ) where the chips and dust to be removed by suction are produced. 
     A through-opening or through-slot  27  extends over a given angular section or segment of the terminal portion with tubular cylindrical wall  21 , thus defining the preferred radial direction in which suction of the chips and the dust is performed. In the particular embodiment shown, the slot extends as far as the free end of the portion  21 . In order to reduce the noisiness of the suction flow, the contour of the slot is rounded and without corners. 
     In the preferred embodiment, the nozzle has a visible reference mark, for example a notch or relief  28  (or other mark) situated on the outside of the nozzle, opposite the slot, i.e. in a position axially aligned with the slot  27 . This visible reference mark, shown in  FIG. 5 , is located on a part of the nozzle arranged “downstream”, i.e. intended to remain in the environment where the operator is situated and allows the latter to know and if necessary to adjust the angular orientation of the slot and therefore of suction, directing it towards the position of the drilling machine or in any case the zone where drilling is performed. The advantage of this is that that operator does not need to remove every time the nozzle from the drilling template in order to find out exactly the orientation of the suction slot  27 . 
     In order to apply more easily the nozzle  20  onto the drilling template, the flange  24  has preferably two opposite, smaller-width, lateral segments or zones  29 . In the embodiment shown in the drawings, the smaller-width zones  29  consist of two parallel lateral flattened surfaces lying in planes formed parallel and opposite to the central longitudinal axis x of the nozzle  20 . Owing to the flattened surfaces  29 , the nozzle may be inserted correctly through the bushing  12 , bringing the magnet  25  into contact against the bushing  12  without the flange  24  of the nozzle interfering with the heads of the screws  15 . In other words, it is not required to disassemble before by hand the screws  15  in order to apply the nozzle into the drilling template. As an alternative to the flattened surfaces  29  the flanges  24  may be designed differently, for example with zones radially projecting by a different amount around the nozzle, so as to define flange zones which have a width smaller than the minimum distance between the heads of two screws situated close to the same bush. For example, the opposite smaller-width lateral zones may be defined by opposite curved convex surfaces. 
     As can be understood, the invention makes advantageous the use of the bushing already provided in the conventional drilling templates in order to receive the boring devices (drilling motor) using them as seats for the suction spouts. Conveniently the ferromagnetic property of the bushings (made of iron or steel or in any case another ferromagnetic material) is exploited in order to retain in a sufficiently stable manner the nozzle on the drilling template, both as regards the distance separating the nozzle from the template and as regards any angular displacements thereof. 
     Although an example of embodiment has been illustrated in the above detailed description, it should be noted that a large number of variants exist. It may also be understood that the embodiment illustrated constitutes just one example and is not to be regarded as limiting in any way the scope, applicability or configuration. For example, the nozzle may have a slightly inwardly curved shape instead of a shape with a straight axis as in the example illustrated. The drawings and the detailed description provided above, instead, will provide persons skilled in the art with a convenient guide for implementing the invention, it being understood that various modifications may be made to the functions and configuration of the parts described in the example of embodiment, without departing from the scope of the invention as defined in the accompanying claims and their legal equivalents.