Abstract:
A snap coupling system for pieces or metallic or non metallic coupling members, that require to be attached perpendicularly in a “T” fashion, in a cross “+” fashion or angularly, by which a tubular male coupling member having one or more retention tabs that are temporally flexed, enters in slots or receiving apertures of another piece or female coupling member, tubular or planar, where they engage, by which they can be readily attached two tubular members or one tubular member and one planar member, in a perpendicular way, in a cross fashion or angularly, without the necessity of using skilled labor.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    A. Field of the Invention 
         [0002]    This invention refers to a snap coupling system which allows instant coupling and safely linking of several coupling members to each other, wherein one or more retention tabs of one male tubular coupling member is temporally flexed to enter into guides or receiving cavities of another female tubular coupling member in which the tabs snaps are engaged; and more particularly is related to a special snap coupling system for joining at least one tubular member to another tubular or flat member in different coupling angles. 
         [0003]    B. Background of the Invention 
         [0004]    Snap joins are well known, these are commonly used to instantly coupling and securing a variety of tubular coupling members to each other, particularly of plastic materials because the plastic material is particularly suitable because of its flexibility which allows that coupling protrusions of the snap joints could be temporarily flexed to be introduced into a coupling receptacle of another tubular member. 
         [0005]    The advantage of the snap joint couplings, is that allow to couple two tubular coupling members without the necessity to use adhesives, bolts, screws, nor special tools to thermally join said tubular coupling members, for which it is necessary to use qualified manpower. 
         [0006]    For metallic or non-metallic coupling members, the thermal join by means of welding or fusion is the common way of permanently joining said metallic or non-metallic coupling members. Other joining methods of metallic or non-metallic coupling members involve the use of adhesives or the use of a third holding member to carry out the joining or holding of the elements to each other. 
         [0007]    The joining by means of welding, requires special tools as well as qualified manpower and safety equipment. Additionally, the application of welding requires counting with a power source of fuel, as well as measuring and calibration instruments for the materials in order to achieve a squaring of the join (use of levels and squares). 
         [0008]    In view of the former, applicants developed a snap coupling system special for metallic or non metallic coupling members requiring joining in diverse coupling angles, by which a tubular male coupling member having one o more retention tabs which are temporarily flexed to enter into guides or receiving cavities of another female coupling member either tubular or flat, in which the tabs snaps, by which two coupling members can be rapidly joined, without the necessity of qualified manpower. 
         [0009]    By means of the snap coupling system, of the present invention, two metallic or non metallic coupling members can be permanently or semi permanently joined in diverse coupling angles, without the necessity of use welding, adhesives, additional holding elements, instruments or tools, with which time is saving by avoiding the use of welding. Besides, as the snap coupling uses guides to carry out said coupling, the necessity to measure and size the coupling members is avoided in order to achieve a precise joining, with which one can obtain additional time saving in the joining of the metallic or non-metallic coupling members. 
         [0010]    Furthermore, as by means of the snap coupling system of the present invention, the coupling members can be easily assembled in the place wherein these will be used, it is not necessary to transport to the assembling place the assembled or welded pieces in structures which can be too large and difficult to transport. 
         [0011]    The snap coupling system of the present invention, promotes the design of individual pieces or coupling members to be assembled, which can be efficiently packed and translated. 
       SUMMARY OF THE INVENTION 
       [0012]    It is therefore a main object of the present invention, to provide a snap coupling system between coupling members, special to join metallic or non-metallic coupling members, in diverse coupling angles, by which a tubular male coupling member having one or more retention tabs which are temporarily flexed to enter into slots or receiving cavities of another female coupling member either tubular or flat, in which the tabs snaps, by which two coupling members can be rapidly joined, without the necessity of qualified manpower. 
         [0013]    It is another main object of the present invention, to provide a snap coupling system between coupling members, of the above disclosed nature, by which two metallic or non-metallic coupling members can be permanently coupled in diverse coupling angles, without the necessity to use welding, additional holding elements or tools, by which time is saved because its welding is not necessary. 
         [0014]    It is still another main object of the present invention, to provide a snap coupling system between coupling members, of the above disclosed nature, in which the snap coupling provides guides in the coupling members, to carry out the coupling, with which the need of measuring and sizing the coupling members to get a precise coupling is avoided, obtaining additional saving of time in the coupling of the two coupling members. 
         [0015]    It is an additional object of the present invention, to provide a snap coupling system between coupling members, of the above disclosed nature, by which coupling members can be easily coupled in the place in which the they are going to be used, without the necessity to transport the coupling members already welded to the assembling place, in structures which can be too long and difficult to be transported. 
         [0016]    It is another additional object of the present invention, to provide a snap coupling system between coupling members, of the above disclosed nature, which promotes the design of individual coupling members which can be efficiently packed and translate. 
         [0017]    These and other objects and advantages of the snap coupling system between coupling members, of the present invention, will be clear enough to those persons having ordinary skill in the art, from the following detailed description of the embodiments of the invention, which will be disclosed with reference to the accompanied drawings and which will be within the true scope of the present invention. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0018]      FIG. 1 , is a conventional schematic perspective view of the snap coupling system between coupling members, of the present invention, showing a tubular male coupling member, of a quadrangular cross section, showing retention tabs lifted in an angle directed outwardly and a tubular female coupling member, of a quadrangular cross section sowing retention slots, to be assembled with the male coupling member, in a “T” fashion, which constitutes a first preferred embodiment of the system of the present invention; 
           [0019]      FIG. 1A , is a schematic conventional perspective view of the snap coupling system between coupling members, of the present invention, similar to that of  FIG. 1 , showing retention tabs introduced in an angle directed; 
           [0020]      FIG. 1B , is a schematic conventional perspective view of the snap coupling system between coupling members, of  FIG. 1 , of the present invention, assembled, showing its coupling members partially cut; 
           [0021]      FIG. 1C , is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, showing the tubular male coupling member, of a quadrangular cross section, showing a retention tab lifted in an angle directed outwardly, in each of the walls of a coupling end, and a tubular female coupling member, of a quadrangular cross section, showing a retention quadrangular aperture in one coupling wall of the female coupling member, paced in an intermediate portion thereof, to be assembled with the male coupling member, in a “T” fashion, constituting another preferred embodiment of the system of  FIG. 1 , in accordance with the present invention; and 
           [0022]      FIG. 10 , is a schematic conventional perspective view of the snap coupling system, between coupling members, of  FIG. 1 , of the present invention, fully assembled; 
           [0023]      FIG. 2  is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, showing a tubular male coupling member, of a quadrangular cross section showing its retention tabs lifted in an angle directed outwardly and a tubular female coupling, of quadrangular cross section, sowing its retention slots, to be assembled to each other is a “+” fashion, constituting a second preferred embodiment of the system, according to the present invention; 
           [0024]      FIG. 2A  is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, similar to that of  FIG. 2 , showing the retention tabs of both the male member and the female member; 
           [0025]      FIG. 2B , is a schematic conventional perspective view of the snap coupling system, between coupling members, of  FIG. 2 , of the present invention, fully assembled in a “+” fashion; 
           [0026]      FIG. 3 , is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, showing a tubular male coupling member of a quadrangular cross section, showing retention tabs lifted in an angle directed outwardly, and a tubular female coupling member of a circular cross section, showing its retention slots for the coupling in a “T” fashion, constituting a third preferred embodiment of the system, according to the present invention; 
           [0027]      FIG. 3A  is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, similar to that of  FIG. 3 , showing the retention tabs introduced in an angle directed inwardly; 
           [0028]      FIG. 3B , is a schematic conventional perspective view of the snap coupling system, between coupling members, of  FIG. 3 , of the present invention, fully assembled in a “T” fashion; 
           [0029]      FIG. 4 , is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, showing a tubular male coupling member of a circular cross section, showing retention tabs lifted in an angle directed outwardly, and a tubular female coupling member, of a circular cross section, showing its retention slots, for its coupling in a “T” fashion, constituting a fourth preferred embodiment of the system according with the present invention; 
           [0030]      FIG. 4A , is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, similar to that of  FIG. 4 , showing retention tabs introduced in an angle directed inwardly; 
           [0031]      FIG. 4B , is a schematic conventional perspective view of the snap coupling system, between coupling members, of  FIG. 4 , of the present invention, fully assembled in a “T” fashion; 
           [0032]      FIG. 5 , is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, showing a tubular male coupling member, of a circular cross section, showing retention tabs lifted in an angle directed outwardly, and a tubular female coupling member, of a quadrangular cross section, showing its retention slots curved for its coupling in a “T” fashion, constituting a fifth preferred embodiment of the system according to the present invention; 
           [0033]      FIG. 5A , is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, similar to that of  FIG. 5 , showing the retention tabs introduced in an angle directed inwardly; 
           [0034]      FIG. 5B , is a schematic conventional perspective view of the snap coupling system, between coupling members, of  FIG. 5 , of the present invention, fully assembled in a “T” fashion” 
           [0035]      FIG. 6 , is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, showing a tubular male coupling member, of a quadrangular cross section, showing retention tabs lifted in an angle directed outwardly and a quadrangular retention cut, and a tubular female coupling member, of a circular cross section, showing its retention slots, for its coupling in a “+” fashion, constituting a sixth preferred embodiment of the system according to the present invention; 
           [0036]      FIG. 6A , is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, showing a tubular male coupling member, of a quadrangular cross section, similar to that of  FIG. 6 , showing retention tabs lifted in an angle directed inwardly; 
           [0037]      FIG. 6B , is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, of  FIG. 6 , fully assembled in a “+” fashion; 
           [0038]      FIG. 7 , is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, showing a tubular male coupling member of a circular cross section, showing its retention tabs lifted in an angle directed outwardly, and a tubular female coupling member, of a quadrangular cross section, showing its quadrangular retention cut for its coupling in a “+” fashion, constituting a seventh preferred embodiment of the system according to the present invention; 
           [0039]      FIG. 7A , is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, of  FIG. 7 , fully assembled in a “+” fashion; 
           [0040]      FIG. 8 , is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, showing a tubular male coupling member of a circular cross section showing retention tabs lifted in an angle directed outwardly, and a tubular female coupling member of a circular cross section, showing its quadrangular cut, for its coupling in a “+” fashion, which constitutes an eight preferred embodiment of the system according with the present invention; 
           [0041]      FIG. 8A , is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, of  FIG. 8 , fully assembled in a “+” fashion; 
           [0042]      FIG. 9 , is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, showing a tubular male coupling member of a quadrangular cross section, showing retention tabs angularly cut and lifted in an angle directed outwardly, and a tubular female coupling member, of a quadrangular cross section, showing its retention slots to be assembled to each other in an angular fashion constituting a ninth preferred embodiment of the system according with the present invention; 
           [0043]      FIG. 9A , is a schematic conventional perspective view of the snap coupling system, between coupling members, of the present invention, of  FIG. 9 , showing retention tabs angularly cut and in an angle directed inwardly; 
           [0044]      FIG. 9B  is a schematic conventional perspective view of the snap coupling system, between coupling members, of  FIG. 9 , fully assembled in an angular fashion; 
           [0045]      FIG. 10 , is a schematic conventional perspective view of a tenth embodiment of the snap coupling system, between coupling members, showing a tubular male coupling member of a quadrangular cross section, showing two retention tabs in its lateral walls, and two retention tabs in its upper and lower walls, opposed to the lateral walls, lifted in an angle directed outwardly, and a tubular female coupling member of a quadrangular cross section, showing a passing through retention aperture, for assembling to each other in a “+” fashion; 
           [0046]      FIG. 10A , is a schematic conventional perspective view of the snap coupling system, between coupling members, showing a tubular male coupling member of a quadrangular cross section, showing in turn two retention tabs opposed to each other, in each one of its walls, lifted in an angle directed outwardly, and a tubular female coupling member of a quadrangular cross section, showing a passing trough retention aperture, to be assembled to each other in a “+” fashion; 
           [0047]      FIG. 10B , is a schematic conventional perspective view of the snap coupling system, between coupling members, of  FIG. 10 , showing a tubular male coupling member of a quadrangular cross section y un tubular female coupling member of a quadrangular cross section, fully assembled to each other, in a “+” fashion; 
           [0048]      FIG. 11 , is a schematic front view, of an eleventh embodiment of the snap coupling system, between coupling members, showing a tubular male coupling member of a quadrangular cross section, showing in turn its retention tabs lifted in an angle directed outwardly, and a tubular female coupling member, of a quadrangular cross section, showing its passing through retention aperture, to be assembled to each other, in a “+” fashion, forming a fence or gate; 
           [0049]      FIG. 11A , is a schematic conventional perspective view of the snap coupling system, between coupling members, of  FIG. 11 , forming a fence or grid, partially assembled; and 
           [0050]      FIG. 11B , is a frontal view, similar to that of  FIG. 11A , showing a variant of the arrangement of the tabs of the male coupling member forming a fence or gate partially assembled. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0051]    The snap coupling system, of the present invention, will be described with reference to the accompanying drawings, using reference numbers to identify the constitutive parts of the system, shown in the drawings which illustrate the preferred embodiments of the invention. 
         [0052]    In said specific embodiments, the snap coupling system, of the present invention, which is useful for the assembling of elements of structural use such as those used in the manufacture of: railings, fences, bars and protective fences, gates, surrounding fences, protective screens, carpots, trailers, greenhouses, racks, disassembled structures, pergolas, and canopies, automotive, with line furniture, chassis, metallic furniture, among others. 
         [0053]    Referring to a first embodiment of the snap coupling system, between tubular coupling members of a quadrangular cross section, for its assembling in a “T” fashion, of the present invention, illustrated in  FIG. 1 , this comprises: 
         [0054]    a tubular male coupling member  1 , of a quadrangular cross section, of: a first end  2   a  and a second end  2   b ; a first lateral wall  3   a  and a second lateral wall  3   b ; an upper wall  4   a  and a lower wall  4   b ; a first projection  5   a  extending from the first end  2   a  of the first side wall  3   a  of the a tubular male coupling member  1 , said projection  5   a  including a retention tab  6   a , cut therein, directed to the second end  2   b  of said a tubular male coupling member  1  and lifted in an angle outwardly of said a tubular male coupling member  1 , having a retention edge  7   a ; and a second projection  5   b  extending from the first end  2   a  of the second side wall  3   b  of the a tubular male coupling member  1 , said projection  5   b  including a retention tab  6   b  cut therein, directed also to the second end  2   b  of the a tubular male coupling member  1  and lifted in a angle directed outwardly of said a tubular male coupling member  1 , having a retention edge  7   b  (not illustrated); 
         [0055]    a tubular female coupling member  10  to be perpendicularly coupled to the a tubular male coupling member  1 , in a “T” fashion, of a quadrangular cross section, and having: a first end  11   a  and a second end  11   b ; a first side wall  12   a  and a second side wall  12   b , and an upper wall  13   a  and a lower wall  13   b , each of which having an inner wall and an outer wall; a first and a second parallel transversal slots  14   a ,  14   b , each of which extending vertically widthwise to the first side wall  12   a  of the a tubular female coupling member  10 , as it is illustrated in  FIG. 1 , wherein the distance between the first and second slots  14   a  and  14   b  is similar to the distance existing between the first and second projections  5   a  and  5   b  of the tubular male coupling member  1 , as it is illustrated in  FIGS. 1 ,  1 B and  1 D; and 
         [0056]    wherein the first and second projections  5   a  and  5   b , with its respective retention tabs  6   a  andx  6   b , of the side walls  3   a  and  3   b  of the a tubular male coupling member  1 , passing in a guided way, momentarily flexing said tabs, trough the parallel first and second transversal slots  14   a  and  14   b  of the first side wall  12   a  of the a tubular female coupling member  10 , en a perpendicular way, such that, when the tabs recover its position, its retention edge  7   a ,  7   b  (not illustrated) are locked at the inner surface of the first side wall  12   a  of the a tubular female coupling member  10 , being retained both coupling members to each other. 
         [0057]    In the embodiment illustrated in  FIG. 1A , the retention tabs  6   a  and  6   b  (not illustrated) are flexed inwardly of the inner surface of the side walls  3   a  and  3   b  of the tubular male coupling member  1 , conversely to the embodiment illustrated in  FIG. 1 . 
         [0058]    In the embodiment of  FIG. 10 , the a tubular male coupling member, of a quadrangular cross section, comprising two retention tabs  6   a ,  6   b  (not illustrated) lifted in an angle directed outwardly, each of which placed in each of the respective side walls  3   a  and  3   b  of the first end  2   a  of the a tubular male coupling member  1 , and two retention tabs  6   c ,  6   d  (not illustrated) lifted also in an angle directed outwardly, placed at the same height of the tabs  6   a  and  6   b  (not illustrated), each of which placed in each of the respective upper and lower walls  4   a  and  4   b  in the same first end of the a tubular male coupling member  1 ; and; 
         [0059]    the tubular female coupling member  10 , of a quadrangular cross section, showing a quadrangular retention aperture  15  in an intermediate portion of the side wall  12   a  of the a tubular female coupling member  10 , to be assembled with the a tubular male coupling member  1 , in a “T” fashion, constituting another preferred embodiment of the system of  FIG. 1 , according with the present invention. 
         [0060]    It should be understand that it is possible that some of the walls of the tubular male coupling member, could include only one tab lifted outwardly or inwardly; and the tubular female coupling member could include a single slot, to give a required assembling force. 
         [0061]    Or else, it is possible that one of the walls of the a tubular male coupling member, could include a first tab in one of its walls and a second tab in an opposite wall, placed opposite to the first tab, both lifted outwardly; and the tubular female coupling member could have a quadrangular aperture, to provide stronger assembling force. 
         [0062]    In all the preferred embodiments, the parallel transversal slots  14   a  and  14   b  ( FIG. 1 ) or the quadrangular aperture  15  ( FIG. 10 ) are made with means which allow high precision cuts such as a cutter by water jet cutting, oxygen cut, plasma cutting and laser cutting and precision die cut, to mention some of them, in order to obtain precision cuts allowing the insertion of the first and second projections  5   a  and  5   b  with very close tolerances which provides an optimum adjustment to the joining. 
         [0063]    Also, it should be understand that the projections and/or the tabs of the tubular male coupling member should be dimensioned such that they could enter into the slots or quadrangular apertures of the tubular female coupling member. 
         [0064]    The retention tabs  6   a  and  6   b  of the first and second projections  5   a  and  5   b  ( FIG. 1 ) are formed in said projections by means of a semi quadrangular cut which defines the form of each tab, and afterwards each tab  6   a  and  6   b  already formed, is flexed and lifted in an angle directed inwardly or outwardly regarding the plane of the corresponding projections  5   a  and  5   b , such that the retention edge  7   a  and  7   b  remain protruded outwardly or inwardly of the a tubular male coupling member  1 , so that they locked leaning on the inner edge of the slots  14   a  and  14   b  of the tubular female coupling member  10 . 
         [0065]    Additionally, each tab  6   a  and  6   b  can include a notch in a central portion of the end thereof in order to introduce a tool there through and facilitate flexing of the tab to a desired position. 
         [0066]    When both tubular male  1  and female  10  coupling members are to be joined, the first and second projections  6   a  and  6   b  of the a tubular male coupling member  1  are perpendicularly inserted into the first and second parallel slots  14   a ,  14   b  of the a tubular female coupling member  10 , such that the retention tab  6   a ,  6   b  of each projection  5   a ,  5   b  are flexed staying in the same plane as the corresponding projection  5   a ,  5   b , until it completely enters perpendicularly into the parallel slots  14   a ,  14   b  of the a tubular female coupling member  10 , and turns back by deflection to its lifted or sunken position, such that the retention edge  7   a ,  7   b  of each tab  6   a  and  6   b , form a padlock being locked on the inner surface of the inner surface of the first side wall  12   a  of the a tubular female coupling member  10 , as it is shown in  FIGS. 1 ,  1 A,  1 B,  10  and  1 D, avoiding that the projection  6   a ,  6   b  could slide outside of the slot  14   a ,  14   b  of the a tubular female coupling member  10 . 
         [0067]    Additionally that the projections  6   a ,  6   b  of the a tubular male coupling member  1  cannot be withdrawn from the a tubular female coupling member  10 , they also cannot turn because of the closed tolerance with which they were inserted, because there is no space of “backlash” between the projections  5   a  and  5   b , the parallel transversal slots  14   a ,  14   b  and the inner surface of the first side wall  12   a  of the a tubular female coupling member  10 . 
         [0068]    In this way, in the preferred embodiments of the invention, illustrated in  FIG. 1  and in  FIG. 1A , the a tubular male coupling member  1  stay joined by an end  2   a  to the a tubular female coupling member  10 , perpendicularly, forming a “T” as it is shown in  FIG. 1B  and  FIG. 1D . 
         [0069]    The joining between the a tubular male coupling member  1  and the a tubular female coupling member  10 , can or cannot be disassembled, depending of the position and angle of each tab in the moment of the insertion of the projections. In the preferred embodiments of the invention, the joining is permanent. 
         [0070]    In a second embodiment of the invention, illustrated in  FIG. 2 , the snap coupling system, between coupling members of a quadrangular cross section to be assembled in a “+” fashion, of the present invention, this comprises: 
         [0071]    a tubular male coupling member  20 , of a quadrangular cross section, having: a first side wall  21   a  and a second side wall  21   b ; an upper wall  22   a  and a lower wall  22   b ; a first and a second slots  23   a ,  23   b , parallel to each other, both made transversally at an intermediate portion of the side walls  21   a  and  21   b , extending from the edge of the lower wall  22   b  to the upper wall  22   a ; a first retention tab  24   a  and a second retention tab  24   b  (not illustrated), both practiced between the slots  23   a  and  23   b , in each side wall  21   a  and  21   b , beginning from the lower wall  22   b  to the upper wall  22   a , presenting a retention edge  25   a  and  25   b  (not illustrated), respectively; 
         [0072]    a tubular female coupling member  30 , of a quadrangular cross section, to be perpendicularly coupled to the a tubular male coupling member  20  in a “+” fashion, having a first side wall  31   a  and a second side wall  31   b ; an upper wall  32   a  and a lower wall  32   b ; a first transversal slot  33   a  and a second transversal slot  33   b  (not illustrated), parallel to each other, each of which extends vertically from the upper wall  32   a  to the lower wall  32   b ; and a quadrangular cut  34  in the upper wall  32   a , to allow the insertion of the a tubular male coupling member  20 , between the slots  33   a  and  33   b  (not illustrated), so that the retention edges  25   a  and  25   b  (not illustrated) stay locked against the inner edges of the upper edge of the upper wall  32   a  at both sides of the quadrangular cut  34 , staying in this way coupled the a tubular male coupling member  20 , with the a tubular female coupling member  30  in a “+” fashion as it is illustrated in  FIGS. 2 and 2B ; 
         [0073]    The tubular male coupling member  20 , further including a quadrangular cut (not illustrated) in its lower wall  22   b , in such a way that can be tightly received in the tubular female coupling member  30  to form a joining in a “+” fashion between both tubular coupling members. 
         [0074]    To obtain a “+” highly secure, as it is illustrated in  FIG. 2A , the tubular female coupling member  40  can include, beside of the slots  43   a  and  43   b  and the quadrangular cut  44 , a first retention tab  45   a  and a second retaining tab  45   b , both practiced between the slots  43   a  and  43   b , in each lateral wall  41   a  and  41   b , starting from the edge of the lower wall  42   b  to the upper wall  42   a , presenting a retention edge  46   a  and  46   b  (not illustrated), respectively, staying in this way firmly coupled the tubular male coupling member  20  with the tubular female coupling member  40  in a “+” fashion. 
         [0075]    In a third embodiment of the invention, illustrated in  FIG. 3 , the snap coupling system, between a tubular male coupling member, of a quadrangular cross section, to be coupled in a “T” fashion with a tubular female coupling member, of a circular cross section, of the present invention, this comprises: 
         [0076]    a tubular male coupling member  50 , of a quadrangular cross section, having a first end  51   a  and a second end  51   b ; a first side wall  52   a , and a second side wall  52   b ; an upper wall  53   a  and a lower wall  53   b ; a first projection  54   a  extending from the first end  51   a  of the first side wall  52   a  of the a tubular male coupling member  50 , said projection  54   a  including a retention tab  55   a , cut in therein, directed to a second end  51   b  of said a tubular male coupling member  50  and lifted in an angle outwardly of said a tubular male coupling member  50 , presenting a retention edge  56   a ; and a second projection  54   b , extending from the first end  51   a  of the second side wall  52   b  of the tubular male coupling member  50 , said projection  54   b  including a retention tab  55   b , cut therein, directed also to the second end  51   b  of said a tubular male coupling member  50  and lifted in an angle outwardly of said a tubular male coupling member  50 , presenting a retention edge  56   b  (not illustrated). 
         [0077]    a tubular female coupling member  60  to be perpendicularly coupled to the a tubular male coupling member  50 , in a “T” fashion, of a circular cross section, having: an inner surface and an outer surface; a first end  61   a  and a second end  61   b ; a first and a second parallel transversal slots  62   a ,  62   b , aligned at the same height to each other, in an intermediate portion of the a tubular female coupling member  60 , each of which extends vertically widthwise of the of the wall of the tubular female coupling member  60 , such as it is illustrated in  FIG. 3 , wherein the distance between the first and second slots  62   a ,  62   b  is similar to the distance existing between the first and second projections  54   a ,  54   b  of the tubular male coupling member  50  as it is illustrated in  FIG. 3 ; 
         [0078]    the projections  54   a ,  54   b  and its retention edges  56   a  and  56   b , (not illustrated), preferably having its edge curved, with the same curvature as the a tubular female coupling member  60 ; 
         [0079]    wherein the first and second projections  54   a  and  54   b  with their respective retention tabs  55   a  and  55   b  of the side walls  52   a  and  52   b  of the a tubular male coupling member  50 , passing in a guided way through the first and second parallel transversal slots  62   a ,  62   b  of the surrounding wall of the a tubular female coupling member  60  in a perpendicular way, so that the retention edge  56   a ,  56   b  (no illustrated) of each of the first and second retention tabs  56   a  and  56   b  of the projections  54   a ,  54   b , be locked at the inner wall of the a tubular female coupling member  60 , being retained both coupling members to each other, in a “T” fashion, as can be observed from  FIG. 3B . 
         [0080]    In the embodiment illustrated in  FIG. 3A , the retention tabs  55   a  and  55   b  stay flexed inwardly of the inner surface of the side walls  52   a  and  52   b  of the tubular male coupling member  50 , inversely from the embodiment illustrated in  FIG. 3 . 
         [0081]    In a fourth embodiment of the invention, illustrated in  FIG. 4 , the snap coupling system, between a tubular male coupling member, of a circular cross section, to be assembled in a “T” fashion with a tubular female coupling member, of a circular cross section, of the present invention, this comprises: 
         [0082]    a tubular male coupling member  70 , of a circular cross section, and having: a first end  71   a  and a second end  71   b ; a first projection  72   a  extending from the first end  71   a  of the a tubular male coupling member  70 , said projection  72   a  including a retention tab  73   a , cut therein, directed from the second end  71   b  of said tubular male coupling member  70  and lifted in an angle outwardly of the a tubular male coupling member  70 , presenting a retention edge  74   a ; and a second projection  72   b  extending from the first end  71   a  of the a tubular male coupling member  70 , opposite to the first projection  72   a , said second projection  72   b  including a retention tab  73   b , cut therein, directed also to the second end  71   b  of said tubular male coupling member  70  and lifted in an angle outwardly of the a tubular male coupling member  70 , presenting a retention edge  74   b  (not illustrated); 
         [0083]    a tubular female coupling member  80  to be perpendicularly coupled to the a tubular male coupling member  70 , in a “T” fashion, of a circular cross section and having: an inner surface and an outer surface; a first end  81   a  and a second end  81   b ; a first and a second parallel transversal slots  82   a ,  82   b  aligned at the same height to each other, at an intermediate portion of the a tubular female coupling member  80 , each of which extends vertically widthwise of the wall of the a tubular female coupling member  80 , such as illustrated in  FIG. 4 , wherein the distance between the first and second slots  82   a  and  82   b  is similar to the distance existing between the first and second projections  72   a  and  72   b  of the a tubular male coupling member  70 , such as is illustrated in  FIG. 4 ; 
         [0084]    the projections  72   a  and  72   b  and its retention edges  74   a  and  74   b  (not illustrated) preferably having its edge curved with the same curvature as the tubular female coupling member  80 , 
         [0085]    wherein the first and second projections  72   a  and  72   b , with their respective retention tabs  73   a  and  73   b  of the tubular male coupling member  70 , passing in a guided way through the first and second parallel transversal slots  82   a ,  82   b  of the tubular female coupling member  80 , in a perpendicularly way, such that the retention edge  74   a ,  74   b  (not illustrated) of each of the first and second retention tabs  73   a  and  73   b  of the projections  72   a ,  72   b , stay locked on the inner surface of the a tubular female coupling member  80 , being retained both coupling members to each other in a “T” fashion, such as can be observed from  FIG. 4B . 
         [0086]    In the embodiment illustrated in  FIG. 4A , the retention tabs  73   a  and  73   b  are flexed inwardly of the inner surface of the tubular male coupling member  70 , inversely to the embodiment illustrated in  FIG. 4 . 
         [0087]    In a fifth embodiment of the invention, illustrated in  FIG. 5 , the snap coupling system, between tubular male coupling member, of a circular cross section to be assembled in a “T” fashion, with a tubular female coupling member, of quadrangular cross section, of the present invention, this comprises: 
         [0088]    tubular male coupling member  90  of a circular cross section, having: a first end  91   a  and a second end  91   b ; a first projection  92   a  extending from the first end  91   a  of the tubular male coupling member  90 , said projection  92   a  including a retention tab  93   a , cut therein, directed to the second end  91   b  of said tubular male coupling member  90  and lifted in angle outside of said tubular male coupling member  90 , presenting a retention edge  94   a ; and a second projection  92   b  opposite to the a first projection  92   a  in the same end  91   a , extending from the first end  91   a  of the tubular male coupling member  90 , to the second end  91   b  of the tubular male coupling member  90 , said second projection  92   b  including a retention tab  93   b  cut therein, directed also to the second end  91   b  of tubular male coupling member  90  and lifted in an angle directed outwardly of said tubular male coupling member  90 , presenting a retention edge  94   b  (not illustrated); 
         [0089]    tubular female coupling member  100 , to be perpendicularly coupled to the tubular male coupling member  90 , in a “T” fashion, of a quadrangular cross section, having an inner surface and an outer surface; a first end  101   a  and a second end  101   b ; a first lateral wall  102   a  and a second lateral wall  102   b ; and an upper wall  103   a  and a lower wall  103   b , a first and a second parallel transversal slots  104   a ,  104   b , having a curvature to the ends  101  and  101   b  respectively, similar to those of the projections  92   a ,  92   b  of the tubular male coupling member  90 , aligned at the same height to each other, at an intermediate portion of the tubular female coupling member  100 , each of which extending vertically widthwise of the side wall  102   a  of the tubular female coupling member  100 , such as it is illustrated in  FIG. 5 , wherein the distance between the first and second slots  104   a  and  104   b  is similar to the distance existing between the first and second projections  92   a  and  92   b  of the tubular male coupling member  90 , such as it is illustrated in  FIG. 5 ; 
         [0090]    wherein the first and second projections  92   a ,  92   b  with its respective retention tabs  93   a  and  93   b  of the tubular male coupling member  90  passing in a guided way through the first and second parallel transversal slots  104   a ,  104   b  of the tubular female coupling member  100  in a perpendicular way, in such a way that the retention edge  94   a  and  94   b  (not illustrated) of each of the first and second retention tabs  93   a  and  93   b  of the of the projections  92   a ,  92   b , are locked on the inner surface of the tubular female coupling member  100 , being retained both coupling members to each other, in a “T” fashion, such as it is illustrated in  FIG. 5B ; 
         [0091]    In the embodiment illustrated in  FIG. 5A , the retention tabs  93   a ,  93   b  being flexed inwardly at the inner surface of the tubular male coupling member  90 , conversely of the embodiment of  FIG. 5 . 
         [0092]    In a sixth embodiment of the invention, illustrated in  FIG. 6 , the snap coupling system between a tubular male coupling member of a quadrangular cross section, to be assembled in a “+” fashion, with a tubular female coupling member of a circular cross section, of the present invention, this having: 
         [0093]    a tubular male coupling member  110 , of a quadrangular cross section, having a first side wall  111   a  and a second side wall  111   b ; an upper wall  112   a  and a lower wall  112   b ; a first retention tab  113   a  and a second retention tab  113   b , parallel to each other, both practiced in a transversal way in an intermediate portion of the side walls  111   a  and  111   b  extending from the edge of the upper wall  112   a  to the lower wall  112   b  presenting a retention edge  114   a  and  114   b  respectively, and a rectangular cut  115  in the upper wall  112   a , placed upwardly of the tabs  113   a  and  113   b , to allow the input of the tubular female coupling member  120  into the tubular male coupling member  110  through said rectangular cut  115 ; 
         [0094]    tubular female coupling member  120  to be coupled to the tubular male coupling member  110  in a “+” fashion, of a circular cross section, having: an inner surface and an outer surface; a first end  121   a  and a second end  121   b ; a first and a second parallel transversal slots  122   a ,  122   b , aligned at the same height to each other, at an intermediate portion of the tubular female coupling member  120 , each of which extends vertically widthwise of the tubular female coupling member  120 , such as it is illustrated in  FIG. 6 , wherein the distance between the first and second slots  122   a  and  122   b  is similar to the distance existing between the first and second tabs  113   a  and  113   b , of the tubular male coupling member  110 , such as is illustrated in  FIG. 6 ; 
         [0095]    the retention edges  114   a  and  114   b  of the retention tabs  113   a  and  113   b  preferably having its edge curved with the same curvature as the inner of the tubular female coupling member  120 ; 
         [0096]    wherein the first and second tabs  113   a  and  113   b  of the side walls  111   a  and  111   b  of the tubular male coupling member  110 , passing in a guided way through the first and second parallel transversal slots  122   a ,  122   b  of the tubular female coupling member  120 , in a “+” fashion in such a way that the retention edge  114   a ,  114   b  of each of the first and second retention tabs  113   a  and  113   b , are locked at the inner surface of the tubular female coupling member  120 , being retained both coupling members to each other in a “+” fashion such as is illustrated in  FIG. 6 ; 
         [0097]    In the embodiment of  FIG. 6A , the retention tabs  113   a  and  113   b  being flexed inwardly of the inner surface of the side walls  111   a  and  111   b  of the tubular male coupling member  110 , conversely to the embodiment illustrated in  FIG. 6 . 
         [0098]    In a seventh embodiment of the invention, illustrated in  FIG. 7 , the snap coupling system between a tubular male coupling member, of a circular cross section, to be assembled in a “+” fashion with a tubular female coupling member, of a quadrangular cross section, of the present invention, this comprises: 
         [0099]    a tubular male coupling member  130  of a circular cross section, having: a first end  131   a  and a second end  131   b ; a first slot  132   a  and a second slot  132   b  parallel to each other extending transversally at an intermediate portion of the tubular male coupling member  130 , to approximately one third of the bosy of tubular male coupling member  130 ; a first and second retention tabs  133   a  and  133   b  (not illustrated) directed opposite to each other between the slots  132   a ,  132   b  at the curved surface of the tubular male coupling member  130  and lifted in an angle outwardly of said tubular male coupling member  130 , presenting a retention edge  134   a  and  134   b  (not illustrated); 
         [0100]    a tubular female coupling member  140 , to be coupled to the tubular male coupling member  130  in a “+” fashion, of a quadrangular cross section, having: an inner surface and an outer surface; a first end  141   a  and a second end  141   b ; a first side wall  142   a  and a second side wall  142   b ; and a upper wall  143   a  and a lower wall  143   b ; and a quadrangular cut  144  in its lower wall  143   b  in an intermediate portion of the tubular female coupling member  140 , having the same width as the slots  132   a  and  132   b  of the tubular male coupling member  130 ; 
         [0101]    wherein the first and second slots  132   a  and  132   b , with its respective tabs  133   a  and  133   b  (not illustrated) of the tubular male coupling member  130 , passing in a guided way through the edges of the side walls  142   a  and  142   b  of the quadrangular cut  144  of the tubular female coupling member  140  coupling in a “+” fashion in such a way that the retention edge  134   a ,  134   b  (not illustrated), of each of the first and second retention tabs  133   a  and  133   b  (not illustrated), are locked on the inner surface of the tubular female coupling member  140 , being retained both coupling members to each other in a “+” fashion, such as is illustrated in  FIG. 7A . 
         [0102]    In an eighth embodiment of the invention, illustrated in  FIG. 8 , the snap coupling system between a tubular male coupling member, of a circular cross section, to be assembled in a “+” fashion with a tubular female coupling member, of a circular cross section, of the present invention, this comprises: 
         [0103]    tubular male coupling member  150 , of a circular cross section, having: a first end  151   a  and a second end  151   b ; a first tab  152   a  and a second tab  152   b  (not illustrated), opposed to each other at the curved surface of the tubular male coupling member  150 , extending transversally at an intermediate portion of the tubular male coupling member  150 , to about one third of the body of the tubular male coupling member  150  and lifted in an angle outwardly of said tubular male coupling member  150 , each of which presenting a retention edge  153   a  and  153   b  (not illustrated); 
         [0104]    a tubular female coupling member  160 , of a circular cross section, to be coupled to the tubular male coupling member  150  in a “+” fashion, of a circular cross section, having: a first end  161   a  and a second end  161   b ; and a circular cut  162  at an intermediate portion of the tubular female coupling member  160 , having the same width than the tabs  152   a  and  152   b  (not illustrated) of the tubular male coupling member  150 ; 
         [0105]    wherein the first and second tabs  152   a  and  152   b  (not illustrated), with its respective retention edges  153   a  and  153   b  (not illustrated) of the tubular male coupling member  150  passing in a guided way through the lateral edges of the circular cut  162  of the tubular female coupling member  160  being coupled in a “+” fashion in such a way that the retention edge  153   a ,  153   b  (not illustrated), of each of the first and second retention tabs  152   a  and  152   b  (not illustrated), be locked at the inner surface of the circular cut  162  of the tubular female coupling member  160 , being retained both coupling members to each other, in a “+” fashion as can be observed at  FIG. 8A . 
         [0106]    A ninth embodiment of the snap coupling system between tubular coupling members, of a quadrangular cross section to be angularly coupled, in an any suitable angle, of the present invention, illustrated in  FIGS. 9 ,  9 A and  9 B, this comprises: 
         [0107]    a tubular male coupling member  170  of a quadrangular cross section, having a first end  171   a  and a second end  171   b , the first end  171   a  being cut in an angle to the second end  171   b ; a first side wall  172   a  and a second side wall  172   b  shorter than the first side wall  172   a ; an upper wall  173   a  and a lower wall  173   b , which are cut at the same angle than the first end  171   a ; a first projection  174   a  extending from the first end  171   a  of the first side wall  172   a  of the tubular male coupling member  170 , said projection  174   a  including a retention tab  175   a , cut therein directed to the second end  171   b  of said tubular male coupling member  170  and lifted in an angle outwardly of said tubular male coupling member  170 , presenting a retention edge  176   a ; and a second projection  174   b  which is shorter than the first projection  174   a , extending from the first end  171   a  of the second side wall  172   b  of the tubular male coupling member  170 , said projection  174   b  including a retention tab  175   b  cut therein, directed also to the second end  171   b  of the tubular male coupling member  170 , and lifted in an angle outwardly of said tubular male coupling member  170  presenting a retention edge  176   b  (not illustrated); 
         [0108]    a tubular female coupling member  180 , of a quadrangular cross section, to be angularly coupled to the tubular male coupling member  170 , having: an inner wall and an outer wall; a first end  181   a  and a second end  181   b ; a first side wall  182   a  and a second end wall  182   b ; and an upper wall  183   a  and a lower wall  183   b ; a first and a second parallel transversal slots  184   a ,  184   b , each of which extending vertically widthwise of the first side wall  182   a  of the tubular female coupling member  180 , such as illustrated in  FIG. 9 , wherein the distance between the first and second slots  184   a  and  184   b  is similar to the distance existing between the first and second projections  174   a  and  174   b  of the tubular male coupling member  170 , such as it is illustrated in  FIG. 9 ; 
         [0109]    wherein the first and second projections  174   a  and  174   b  being angularly defaced to each other, with their respective retention tabs  175   a ,  175   b  of the side walls  172   a  and  172   b  of the tubular male coupling member  170 , passing in a guided way through the first and second parallel transversal slots  184   a ,  184   b  of the first side wall  182   a  of the tubular female coupling member  180  in an angular way, such that the retention edge  176   a ,  176   b  (not illustrated) of each of the first and second retention tabs  175   a  and  195   b  of the projections  174   a ,  174   b  are locked at the inner surface of the first side wall  182   a  of the tubular female coupling member  180 , being angularly retained both coupling members to each other, in accordance to the angle cut of the first end  171   a  of the tubular male coupling member  170 , such as it can be observed from  FIG. 9B . 
         [0110]    In the embodiment illustrated in  FIG. 9A , the retention tabs  175   a  and  175   b  being flexed inwardly of the inner surface of the side walls  172   a  and  172   b  of the tubular male coupling member  170 , conversely to the embodiment illustrated in  FIG. 9A . 
         [0111]    Additionally, the tubular female coupling member  180 , can include a pair of slots (not illustrated) in its side walls  182   b  to angularly coupling an additional tubular male coupling member, similar and opposite to the  170 . 
         [0112]    In a tenth embodiment of the snap coupling system between coupling members, illustrated in  FIG. 10 , comprising tubular male coupling member, of a quadrangular cross section, having two retention tabs opposite to each other, lifted in an angle outwardly, and a tubular female coupling member of a quadrangular cross section, having a passing through retention aperture, to be assembled to each other in a “+” fashion, comprising: 
         [0113]    a tubular male coupling member  190  of a quadrangular cross section, having: a first end  191   a  and a second end  191   b ; a first side wall  192   a  and a second side wall  192   b ; an upper wall  193   a  and a lower wall  193   b ; a first and a second retention tabs  194   a ,  194   b  (not illustrated) cut in the side walls  192   a  and  192   b , at an intermediate portion of the tubular male coupling member  190 , directed to the second end  191   b  of said tubular male coupling member  190 , and lifted in an angle outwardly of said tubular male coupling member  190 , presenting a retention edge  195   a ,  195   b  (not illustrated); and a third and a fourth retention tabs  194   c  and  194   d  (not illustrated) at an intermediate portion of the tubular male coupling member  190 , at the same height than the tabs a  194   a  and  194   b , but directed to the first end  191   a  of said tubular male coupling member  190  and lifted in an angle outwardly of said tubular male coupling member  190 , presenting a retention edge  195   c ,  195   d  (not illustrated), opposite to the first and second retention tabs  194   a ,  194   b , cut at the upper and lower walls  193   a  and  193   b  of the tubular male coupling member  190 ; and a tubular female coupling member  200 , of a quadrangular cross section, having a first end  201   a  and a second end  201   b ; an upper wall  202   a  and a lower wall  202   b ; a first and a second side walls  203   a  and  203   b ; and a passing through retention aperture  204 , of a quadrangular cross section, at each of the upper and lower walls  202   a  and  202   b , at an intermediate portion of the tubular female coupling member  200 , through which aperture  204  passing the tubular male coupling member  190  by passing the tabs  194   a    194   b ,  194   c  and  194   d  trough said aperture  204  to be locked at the interior thereof, assembling to each other in a “+” fashion. 
         [0114]    In a variation of this tenth embodiment, illustrated in  FIG. 10A , each retention tab of the tubular male coupling member  190 , comprising a first retention tab LR 1  starting from an intermediate PI of one of its walls  192   a ,  192   b ,  193   a ,  193   b , directed to the first end  191   a  of the tubular male coupling member  190 , and a second retention tab LR 2  starting of the same intermediate portion PI of the same wall as the retention tab LR 1 , but directed to the end  191   b  of the tubular male coupling member  190 ; both retention tabs LR 1  and LR 2  being distributed at an space similar to the cross section of the tubular female coupling member  200 , such that on passing the tubular male coupling member between the passing through the quadrangular retention aperture  204  of the tubular female coupling member  200 , each tab LR 1  and LR 2  being bilaterally locked both to the first end  191   a , as to the second end  191   b  of the tubular male coupling member  190 . 
         [0115]    Also in this embodiment, it is possible to include a single tab in one sense and the other in an opposite sense, depending of the strength and stability which it is desired for the coupling system. 
         [0116]    In an eleventh embodiment of the snap coupling system for using with a plurality of tubular coupling members, of quadrangular cross section, to be assembled in a fence or gate, of the present invention, illustrated in  FIGS. 11 ,  11 A and  11 B, comprising: 
         [0117]    at least a tubular male coupling member  210 , of a quadrangular cross section, having: a first end  211   a  and a second end  211   b ; a first side wall  212   a  and a second side wall  212   b ; a front wall  213   a  and a rear wall  213   b  (not illustrated); a first and a second retention tabs  214   a ,  214   b  cut in the side walls  212   a  and  212   b  directed to the second end  211   b  of said tubular male coupling member  210  and lifted in an angle outwardly of said tubular male coupling member  210 , presenting a retention edge  215   a ,  215   b ; and a third and four retention tabs  216   a  and  216   b  opposite to the first and second retention tabs  214   a ,  214   b , spaced to each other at a selected distance, cut at the same side walls  212   a  and  121   b , directed to the first end  211   a  of said tubular male coupling member  210 , lifted in an angle outwardly of said tubular male coupling member  210 , presenting a retention edge  217   a  and  217   b , respectively, directed to the first end  212   a  of the tubular male coupling member  210  and lifted at an angle outwardly of said tubular male coupling member  210 ; 
         [0118]    at least two tubular female coupling member  220   a ,  220   b  of a quadrangular cross section, which are retained by retention posts PR 1 , PR 2  ( FIG. 11A ) to which at least a tubular male coupling member  210  is coupled, to be maintained coupled avoiding that these tubular female coupling members could became detached, forming a fence or gate, each of the tubular female coupling members  220   a  and  220   b  has: a first end  221   a  and a second end  221   b ; a first and second lateral walls  222   a  and  222   b  (not illustrated); and an upper wall  223   a  and a lower wall  223   b ; at least two transversal apertures  224  extending horizontally crossing the upper and lower walls  223   a  and  223   b  of each tubular female coupling member  220   a ,  220   b , spaced at a selected distance similar to that of the retention tabs  214   a ,  214   b ,  216   a  and  216   b  of the tubular male coupling member  210 , such as it is illustrated in  FIGS. 11 and 11A ; 
         [0119]    wherein the first and second retention tabs  214   a ,  214   b  of the side walls  212   a  and  212   b  of the tubular male coupling member  210 , passing in a guided way through the first and second transversal apertures  224  of the upper and lower walls  223   a  and  223   b  (not illustrated) of the tubular female coupling member  220   a  and  220   b , in such a way that the retention edge  215   a ,  215   b  of each of the first and second retention tabs  214   a  and  214   b , of the side walls  212   a  and  212   b  of the tubular male coupling member  210 , be locked on the upper surface of the upper wall  223   a  of the tubular female coupling member  220 , in such a way that prevents that the tubular male coupling member  210  be detached or retires by its lower end  211   b ; and the third and fourth retention tabs  216   a  and  216   b  of the side walls  212   a  and  121   b  of the tubular male coupling member  210 , passing in a guided way through the aperture  224  of the upper and lower walls  223   a  and  223   b  of the tubular female coupling member  220 , in such a way that the retention edge  217   a ,  217   b  of each of the third and fourth retention tabs  216   a  and  216   b , of the side walls  212   a  and  212   b  of the tubular male coupling member  210  be locked on the lower surface of the lower wall  223   b  (not illustrated) of the tubular female coupling member  220   b , in such a way that prevents that the tubular male coupling member  210  be detached by its upper end  211   a , such as it is observed from  FIGS. 11 and 11A . 
         [0120]    In another embodiment of the tubular male coupling members  210 , as it is illustrated in  FIG. 11B , each of the tubular male coupling member  210 , has a retention tab  214   a ,  216   b  with its retention edge  215   a ,  217   b , directed to the first end  211   a , in its first side wall  212   a  and a retention wall  214   a ,  216   b , with its retention edge  215   a ,  217   b , in its second side wall  212   b , but directed to the second end  211   b , in such a way that each of the tubular male coupling members being retained in both senses by its respective intermediate parts. 
         [0121]    It should be understand that in all embodiments formerly described, when coupling the tubular male coupling member with the tubular female coupling member, the retention tabs of the tubular male coupling member are momentarily flexed to allow the tabs passing through the slots of the tubular female coupling member and then, on completely entering the tubular male coupling member into the tubular female coupling member, the tabs recover its position so that its retention edge be locked at the interior of the tubular female coupling member. 
         [0122]    It should be additionally understand that the fence or gate assembled in accordance to the formerly described, can comprise a plurality of tubular male coupling members and tubular female coupling members, under the condition that include the tabs and slots corresponding to the number of coupling members. 
         [0123]    Furthermore, in the embodiment of  FIG. 10 , the tubular female coupling members can be solid of quadrangular or rectangular cross section, as may be the cross section form of the tubular male coupling member. 
         [0124]    Additionally, both tubular male and female coupling members can have a circular cross section. 
         [0125]    Also, as should be evident from the analysis of the tubular female coupling members, of the present invention, all of them present at least a flat or curved surface, with its coupling slots at a unique surface, without the rest of the surrounding walls, which could be only a single flat or curved wall. 
         [0126]    All of these embodiments could be visualized from the following Table 1 of embodiments 
         [0000]    
       
         
               
               
               
               
               
             
           
               
                 TABLE 1 
               
               
                   
               
               
                 Cross Section  
                 Cross Section  
                   
                   
                   
               
               
                 of the  
                 of the  
                   
                   
                   
               
               
                 tubular male 
                 tubular female 
                   
                   
                   
               
               
                 coupling  
                 coupling  
                 Coupling  
                   
                 Embod- 
               
               
                 member 
                 member 
                 Type 
                 FIGS. No. 
                 iment 
               
               
                   
               
             
             
               
                 Quadrangular 
                 Quadrangular 
                 “T” 
                 1, 1A, 1B, 1C, 1D 
                 First 
               
               
                 Quadrangular 
                 Quadrangular 
                 “+” 
                 2, 2A, 2B 
                 Second 
               
               
                 Quadrangular 
                 Circular 
                 “T” 
                 3, 3A, 3B 
                 Third 
               
               
                 Circular 
                 Circular 
                 “T” 
                 4, 4A, 4B 
                 Fourth 
               
               
                 Circular 
                 Quadrangular 
                 “T” 
                 5, 5A, 5B 
                 Fifth 
               
               
                 Quadrangular 
                 Circular 
                 “+” 
                 6, 6A, 6B 
                 Sixth 
               
               
                 Circular 
                 Quadrangular 
                 “+” 
                 7, 7A 
                 Seventh 
               
               
                 Circular 
                 Circular 
                 “+” 
                 8, 8A 
                 Eight 
               
               
                 Quadrangular 
                 Quadrangular 
                 Angular 
                 9, 9A, 9B 
                 Ninth 
               
               
                 Quadrangular 
                 Quadrangular 
                 “+” 
                 10, 10A, 10B 
                 Tenth 
               
               
                 Quadrangular 
                 Quadrangular 
                 Fence  
                 11, 11A 
                 Eleventh 
               
               
                   
                   
                 or Gate 
               
               
                   
               
             
          
         
       
     
         [0127]    The unions referred at the specific embodiments can support a high amount of weight, which give opportunity of apply them in diverse situations. 
         [0128]    It should be finally understand that the snap coupling system between metallic or non-metallic tubular coupling members, of the present invention, is not limited to the embodiments formerly described and that the persons skilled in the art will be able, by the teachings herein disclosed, to carry out changes in the snap coupling system between tubular coupling members, of the present invention, which will be within the true scope of the invention, which will be set forth exclusively by the following claims.