Abstract:
A portable tool used for installing fixing elements for assembling parts, which is particularly suitable for assembling machined parts or sheet metal by riveting. The portable tool includes a device for distributing fixing elements, one by one, according to a distribution axis; mechanism for holding a fixing element according to a placement axis; loading device for transferring a fixing element from the distribution device to the mechanism for holding; and a device for mounting a fixing element in a hole provided in the parts. The tool is characterized in that the loading device alternates between a loading movement for transferring a fixing element from the distribution device to the mechanism for holding and movement back to the initial position. During movements, the loading device describes the same path, alternating between one direction and the opposite direction.

Description:
RELATED U.S. APPLICATIONS  
         [0001]    Not applicable.  
         STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT  
         [0002]    Not applicable.  
         REFERENCE TO MICROFICHE APPENDIX  
         [0003]    Not applicable.  
         FIELD OF THE INVENTION  
         [0004]    This invention relates to a portable tool, intended to be used for the installation of fastening elements, for the assembly of machined parts or of metal sheets. It is particularly suited, but not exclusively, for riveting.  
           [0005]    This invention also relates to a set of tools comprising a portable tool for the installation of fastening elements and to a drilling tool.  
         BACKGROUND OF THE INVENTION  
         [0006]    Riveting different parts together consists of inserting a fastening element in a pre-drilled hole in each of said parts and matched during the operation. Then in a later stage, the fastening element is locked either by deformation thereof or by adding a locking element such as a nut or a ductile ring. Matching the holes drilled in the different parts is advantageously realized when drilling the parts together, during the same operation.  
           [0007]    There is a large number of riveting devices, enabling an operator to perform each of these operations in succession. However, these devices require the operator to choose and to position the fastening element manually.  
           [0008]    This has first of all a major shortcoming, from the economic viewpoint of the workstation. Indeed, the operator has not at his workstation all the fastening elements which he may need to perform the riveting operations. Secondly, such devices involve high risks as regards the quality of the work since the operator may be mistaken and use an inappropriate fastening element.  
           [0009]    There are also mechanized elements moved by controlled machines, to ensure the complete sequence of operations. Such devices integrate means for selecting and making available fastening elements, suited to the location where riveting is carried out, but which have the major shortcoming of being heavy and cumbersome. Consequently, they cannot provide a portable tool handled directly by an operator.  
           [0010]    Since the document EP-0,750.954, an apparatus has been known for feeding, setting and loading a riveting gun.  
           [0011]    However, such apparatus is only suited to rivets fitted with a holding rod, situated opposite the rivet body with respect to the head of the rivet.  
           [0012]    Moreover, during the operation of this apparatus, and notably for bringing the loading arm back to the starting position, the rivet-carrier may slip over the rivet and thereby twist it.  
           [0013]    The purpose of this invention is to provide a tool which remedies the shortcomings aforementioned. In particular, the aim will consist in providing an ergonomic tool, easy to be handled.  
           [0014]    It will also consist in providing a tool which enables to improve the riveting quality while remaining simple of use and cheap.  
           [0015]    Other purposes and advantages will appear during the following description, given only for informative purposes and without being limited thereto.  
         BRIEF SUMMARY OF THE INVENTION  
         [0016]    The invention relates to a portable tool for the installation of fastening parts, of the type comprising:  
           [0017]    means for distributing fastening elements, one by one, according to a so-called distribution axis,  
           [0018]    means for holding a fastening element according to a so-called setting axis,  
           [0019]    loading means for transferring a fastening element from said distribution means to said holding means, and  
           [0020]    means for positioning a fastening element In a hole provided on said parts.  
           [0021]    This portable tool is characterized in that the loading means perform alternately a loading motion to transfer a fastening element from the distribution means to the holding means and a return motion to initial position, during which motions the loading means follow an alternate path in one direction and in the opposite direction.  
           [0022]    According to a variation of the invention, the loading means comprise at least one mobile arm fitted with means for receiving a fastening element as well as means for actuating said mobile arm comprising at least one actuator and transmission means.  
           [0023]    According to the invention, the mobile arm may be in the form of a telescopic pivoting arm or in the form of a sliding arm.  
           [0024]    This invention also relates to a set of portable tools including a portable tool for the installation of fastening elements, and a drill, said tool and the drill being movable over half a turn around an axis perpendicular to the working axis, to position the drill and said tool in the working axis alternately. 
       
    
    
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS  
       [0025]    The invention will be understood better when reading the description, accompanied by the appended drawings, wherein:  
         [0026]    FIGS.  1  to  3  are diagrammatical sectional views of a first variation of a tool according to the invention, illustrating the operation of such tool, respectively in distribution and reception position of a fastening element at the loading means, in loading position of the fastening element at the holding means, then when positioning the fastening element at the parts to be assembled.  
         [0027]    [0027]FIG. 4 is a diagrammatical sectional view showing means for setting a finishing product.  
         [0028]    [0028]FIG. 5 is a sectional view of another variation of a tool according to the invention.  
         [0029]    FIGS.  6  to  11  illustrate the successive stages of the operation cycle of the tool represented on FIG. 5. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0030]    This invention relates to a portable tool for the installation of fastening parts or of metal sheets, or similar which in both variations shown, includes:  
         [0031]    means  1 ,  5  for distributing fastening elements  24  one by one, according to a distributing axis,  
         [0032]    means  50  for holding a fastening element  24  according to a so-called setting axis,  
         [0033]    loading means  60  for transferring a fastening means  24  from the distribution means  1 ,  5  to the holding means  50 , and  
         [0034]    means  23  for positioning a fastening element in a hole provided on the part.  
         [0035]    Besides, according to the main feature of the invention, the loading means  60  perform alternately a so-called loading motion and a so-called return motion, back to initial position. The loading means enables to transfer a fastening element  24  from the distribution means  1 ,  5  to the holding means  50  of a fastening element  24  according to the setting axis  20 . The return motion to initial position enables the loading means  60  to go back with respect to the distribution axis, substantially parallel and coplanar to the setting axis.  
         [0036]    According to the invention, the loading means  60  follow the same path, in one direction and in the opposite direction, during the loading motion and during the return motion to initial position. This path is composed of several parts which will be detailed at a later stage.  
         [0037]    With reference to FIGS. 1 and 5, the loading means  60  may comprise advantageously at least one mobile arm  4  or  62 , fitted with means  7  for receiving a fastening element  24 .  
         [0038]    The loading moans  60  also comprise means  61  for actuating said mobile arm. Said means  61  for actuating said mobile arm comprise at least one actuator  12 - 15  and means  16 - 19  for transmitting the motion of the actuator to the mobile arm, so that means for actuating the mobile arm  4  or  62  being in motion alternately in one direction then in the opposite direction, drive said mobile arm along the path mentioned above, alternately in one direction than in the opposite direction.  
         [0039]    The reception means  7  may be in the form of a rivet-carrier capable of cooperating with a fastening element  24 , such as a rivet.  
         [0040]    Advantageously, said transmission means are in the form of a flexible element  16  stretched between two parallel rolls  17   a ,  17   b . Then, said mobile arm  4  or  62  is slaved to said flexible element  16 .  
         [0041]    For example, the flexible element  16  may be a belt or a band.  
         [0042]    As already underlined, the actuator is capable to drive the mobile arm  4  or  62  via the transmission means  16 - 19 . It may a linear actuator or a rotary actuator.  
         [0043]    A linear actuator may be in the form of a jack. In such a case, the piston  14  may go back and forth in the cylinder  13  according to whether, for instance, air is injected in one chamber or the other of the cylinder. At the end of the tail of the piston  14 , a driving element  15  is fastened. This driving element  15  is also fastened to the flexible element  16 . Thus, when the piston moves in the cylinder. It drives the flexible element  16  by means of the driving element  15 , in the linear portion situated between both rolls  17   a  and  17   b.    
         [0044]    A rotary actuator could be for example a motor slaved at least to one of both rolls  17   a  or  17   b.    
         [0045]    We shall now describe, with reference to FIGS.  1  to  3 , a first variation of a tool according to the invention.  
         [0046]    The whole loading device  60  is fastened to a chassis  2  whereon Is mounted a handle  3  which enables an ergonomic grip of the tool according to invention.  
         [0047]    Advantageously, the mobile arm is in the form of a telescopic pivoting arm  4 . An item  9  of the arm is mounted to pivot around the roll  17   a . Another item  8  of said arm serves as a support for the reception means  7  and it may move along the item  9  mounted to pivot. Moreover, said Item  8  is slaved to said transmission means via a linking pin  18 .  
         [0048]    For example, the linking pin  18  is fastened to the flexible element  16  by an eccentric catch  19 .  
         [0049]    Moreover, the portable tool is fitted with means  1  for distributing fastening elements. It may be for instance a distribution tube fitted at its end with means  5  for re-centering the fastening element. Advantageously, the re-centering means are fitted with a groove wherein is located a spring whereof the spires may be tilted with respect to its axis.  
         [0050]    It is also advantageously to provide that the means  50  for holding a fastening element  24  are in the form of an elastic device  21  enabling to apply a bearing load over at least one portion of the zone of larger diameter of the fastening element, in order to maintain said element along a setting axis  20 .  
         [0051]    In particular, the elastic device comprises at least a spring  22  whereof the spires may be tilted with respect to its axis.  
         [0052]    Still with reference to FIG. 1, the positioning means  23  may be in the form of a pushing or riveting, or still screwing device.  
         [0053]    Obviously, the features regarding the holding means  50 , the distribution means  1  as well as the positioning means  23  may be applied to other variations of a tool according to the invention.  
         [0054]    [0054]FIG. 1 illustrates the initial state of an operation cycle of a tool according to the invention. A fastening element  24  is pushed into the distribution means  1 , in this instance a distribution tube, by pneumatic pressure. It then runs through the re-centering means  5  and the rod of the fastening element is re-centered by the re-centering spring  6 . This enables to align the fastening element with reception means, here the rivet carrier  7 . The body of the fastening element then engages into the rivet carrier  7  which is situated at the end of the item  8  of the mobile arm.  
         [0055]    At that stage, the tail of the piston  14  is almost entirely inside the cylinder  13 . Only the end fastened to the driving element  15  remains outside the cylinder. A chamber of the cylinder is therefore at maximum volume while the other chamber is at minimum volume.  
         [0056]    When the operator actuates the control of the loading means  60 , pressurized air is injected into the chamber of the cylinder  13  whereof the volume is nil, which enables to push the piston  14  which, by means of the driving element  15 , drives the flexible element  16  into translation.  
         [0057]    Consecutively, the linking pin  16  is driven first of all into translation, then into rotation around the roll  17   b.    
         [0058]    During this motion, the item  8  of the mobile arm  4  moves along the rod  9  of said arm. As the item  8  is slaved to the flexible element  16  by means of the linking pin  18 , and as said pin follows a rotation motion, the mobile arm  4  will also enter into rotation around the pin  10 .  
         [0059]    This enables to bring the rivet carrier  7  into the setting axis  20 . As the motion of the piston  14  is not completed, the linking pin  18  has another translation motion, in the direction opposite that of its previous translation motion. The motion of the rivet carrier  7  becomes therefore rectilinear again, in the setting axis  20 . The fastening element  24  is thus pushed into the holding means  50 , at the elastic device  21 . The head of the fastening element  24  may then cooperate with a holding spring  22 . The result is then that illustrated on FIG. 2.  
         [0060]    Pressurized air is then injected into the now empty chamber, which was initially full, which causes the rivet-carrier and the mobile arm to move along the same path in the opposite displacement direction. The fastening element  24  is held at the holding means  50  whereas the mobile arm returns to its initial position, the rivet-carrier  7  then facing the outlet of the distribution means  1 .  
         [0061]    It should be noted that during the return motion, the rivet carrier  7  moves in the setting axis, and thus longitudinally with respect to the rivet. This enables to prevent notably the fastening element from being twisted as the rivet carrier  6  and the mobile arm  4  are brought back to their initial position.  
         [0062]    As illustrated on FIG. 3, the operator may then insert the fastening element  24  into the hole  25  provided in the part while moving the portable tool forward along the setting axis. When the holding means  50  come into contact with the part, the tool in motion drives the positioning means  23 , for example a riveting hammer, which pushes the fastening element  24  and extracts said element from the holding means  50 . Then the operator may actuate the riveting control.  
         [0063]    In an advantageous embodiment, as illustrated on FIG. 4, a tool according to the invention is fitted moreover with means  26 - 31  to apply a finishing product on the fastening element or around the hole.  
         [0064]    For example, a syringe  26  containing the finishing product is fastened to the mobile arm  4  of the loading means  60 . Said syringe is linked to the rivet carrier  7  by means of a flexible pipe  27  connected to an infeed ring  26 , The finishing product is extruded from the syringe through the pipe, goes through the hole  29  of the feeding ring  28 , flows into the groove  30  of the rivet carrier  7  and comes out thereof through the orifices  31  at the surface resting on the fastening element.  
         [0065]    The finishing product may be a sealing product, a glue or any other adequate product.  
         [0066]    According to another variation of the invention, as illustrated on FIG. 5, the loading means  60  comprise a mobile arm which is in the form of a sliding arm  62  rather than a telescopic pivoting arm as described previously.  
         [0067]    In such a case, said arm  62  is slaved to the flexible element  16  by means of a linking pin  18  fastened to this flexible element, by being snapped in the eccentric cam  19 . This enables to drive the arm  62  along a path inscribed in a plane, running the rivet-carrier from a position situated in the extension of the distribution pipe  1  to a position situated in the working axis  20 .  
         [0068]    Indeed, the sliding arm  62  is fitted with guiding means  40  situated on either side of the volume delineated by the flexible element  16 , and which slides freely above and below such flexible element  16 .  
         [0069]    The operation of a tool corresponding to such embodiment is illustrated on FIGS.  6  to  11 . It is very similar to that described for the previous variation. Thus, when pressurized air is injected into the empty chamber of the cylinder  13  of the actuator, the flexible element  16  is driven thanks to the driving element  15 . Consequently, the linking pin  18  is driven first of all into translation in a first direction, then into rotation around the roll  17   b , then again into translation, in the opposite direction, until it reaches the stop  63  at the end of the stroke.  
         [0070]    During the first part of the motion of the linking pin  18 , guiding means  40  slide freely along the flexible element  16  and consequently the sliding arm  62  follows a translation motion. Then, when the linking pin  18  follows a rotational motion around the roll  17   b , the guiding means  40  remain substantially immobile. Thus, the mobile arm follows a rotational motion corresponding to that of the linking pin  18 .  
         [0071]    Finally, when the linking pin  1 B resumes a translation motion, the guiding means  40  do the same, in the opposite direction. The mobile arm  62  follows again a translation motion. Finally, the fastening element  24  is pushed by the holding means  50 , similarly to that described previously.  
         [0072]    It should be noted that throughout the loading motion from the distribution means  1  to the holding means  50 , the piston  4  has performed only one motion, in a single direction.  
         [0073]    Return to initial position is provided by injecting pressurized air into the chamber of the jack, initially full, now empty. This causes the mobile arm to follow the same path, but in the opposite direction.  
         [0074]    As a summary, during the loading motion of the fastening element, from the distribution means  1  to the holding means  50 , the path followed by the fastening element  24  consists essentially of three sections. In a first section, it follows a translation motion along the distribution axis. Then in a second part of this path, the fastening element follows substantially circular a path, which brings it from the distribution axis to the working axis  20 . Finally, in a third part, the fastening element follows again a translation motion, according to the working axis  20 , but in the direction opposite to the previou5 translation motion.  
         [0075]    The whole motion is performed by displacement in a single direction of the actuator of the loading means  60 .  
         [0076]    In the embodiments described, the actuator is of linear type, a jack in this instance. It is quite thinkable to provide a rotary actuator which would drive one of both rolls  17   a  or  17   b.    
         [0077]    A particular design of a device according to the invention consists in using of its elements as a prop and in fastening a means thereto enabling to hold or to position it in space. It may be, for example, a auction device.  
         [0078]    Advantageously, the tool may then be slaved to a digital control machine or an industrial robot enabling to position it in space.  
         [0079]    It may also be interesting to integrate a tool according to the invention in a set of tools comprising moreover a drill, the tool according to the invention and the drill being able to move over half a revolution around an axis perpendicular to the setting axis  20 , to position alternately the drill and said tool in the working axis.  
         [0080]    Naturally, other embodiments, understandable to the man of the art, could have been contemplated without departing from the framework of the invention.