FR2546425A1 - Antenna consisting of a tubular brace and transverse cords, and its manufacturing method - Google Patents

Abstract

The invention relates to an antenna consisting of a tubular brace 1 to which cords 2 are fixed transversely, each by means of a U-clamp 3 straddling the brace and the cord. The U-clamp includes tabs (lugs) penetrating the wall of the brace 1 and turned over, on the inside, against this wall. Application: television-reception antenna.

Description

ANTENNA CONSTITUTING OF A TUBULAR SPACER AND OF STRANDS

  CROSS-SECTIONAL AND MANUFACTURING METHOD

  The invention relates to an antenna consisting of a

  tubular spacer on which strands are fixed-cross-

  dirty, each by a stirrup straddling the spacer and the strand.

  Such an antenna is described in French patent NO 73 42 316 (2 252 664). The fixing of the stirrup on the spacer is carried out there by a screw. This screwing multiplies the manipulations, which is a drawback during automated manufacturing Furthermore, the screw fixing is liable to loosen under the action

  vibrations to which the antenna is subjected.

  The invention avoids these drawbacks It is characterized

  terrified by the fact that the stirrup has lugs penetrating the

  spacer wall and folded inside against this wall.

  A preferred embodiment of the present invention consists of the succession of the following operations: a crimping bar is threaded into the spacer, the strand is placed on the spacer, the spacer and the strand are overlapped by a stirrup , pressure is exerted on the stirrup to make its lugs penetrate into the spacer and fold them in contact with the crimping bar, the crimping bar is removed. In particular, the process can be implemented for the simultaneous fixing of all

  the antenna strands on the spacer.

  In particular, to avoid preliminary drilling of the spacer at the location of the strands, the lugs can be dimensioned so that they are themselves capable of penetrating into the material of the spacer wall when pressure is applied

on the stirrup.

  The following description and the drawings illustrate

  exemplary embodiments of the invention.

  Figure 1 is a perspective view of a section

antenna according to the invention.

  Figures 2 a and 2 b show, seen from above and in cross section BB, a stirrup used on the antenna according to the

figure 1.

  Figure 3 is a view of the same section illustrating the process of assembling an antenna strand on the spacer. Figure 4 is a view along the axis of the spacer

of the assembled antenna.

  Figures 5 and 6 show, seen from above and in the longitudinal direction, another type of stirrup that can be used

  on an antenna according to the invention.

  The antenna described in example consists of a spacer 1 made of rolled square aluminum tube welded on an edge of

  mm side, whose wall is 0.8 mm thick On this gap

  height rods are staggered 2 transverse antenna strands each consisting of an aluminum bar 5 mm in diameter The strands are

  fixed to the spacer 1 by means of stirrups 3 made by embou-

  weaving of t 8 steel of 1 mm thickness Each stirrup forms

  a trigger guard 4 intended to receive the strand 2 On either side of the pon-

  tet 4, the stirrup has an inverted U-shaped wing 5 opening in the same direction as the trigger guard 4 and intended to be applied on three faces of the spacer 1 A strand 2 and the spacer 1, overlapped by a bracket 3, make an angle of 90 between them On the central face of

  its U-shaped wings, the stirrup 3 is stamped so that two triangular lugs

  strips 6 are cut and folded down, point directed towards the opening

  ture du U The folded base of the lugs 6 is parallel to the spacer 1 which the stirrup must overlap With respect to a median longitudinal plane of the stirrup, the folded bases of the two lugs 6 are located

from either side.

  FIG. 2 illustrates the method of fixing a strand 2 on the spacer 1 A crimping bar 7 is introduced into

  the spacer 1 This bar has a section corresponding to the sec-

  internal tion of the spacer except on one side having, on either side of a longitudinal median plane, a curved facet 8 with concavity facing outwards This double concavity face is placed against the side of the spacer 1 to receive the strand 2 The strand is placed on the spacer and these two elements are then overlapped by a stirrup 3 A pressure is exerted according to arrow A on the steel stirrup so that its pins 6 pierce the aluminum of the 'spacer and are folded in contact with the concave facets 8 of the bar 7, on the back of the spacer wall.

  Figure 3 illustrates the result of this process and no-

  the shape of the pins 6 folded back inside the spacer.

  On the stirrup 13 shown in FIGS. 5 and 6, the trigger guard 14 intended to receive the antenna strand is framed by two

  flat wings to be applied on one side of the square spacer.

  Each of these wings 15 is stamped so that two triangular pins

  strips 16 and 17 are cut and folded down, point directed into the

  same direction as the concavity of the trigger guard 14, that is to say towards the

  height rod (figure 1) The folded base of the pins is parallel to the

  height rod to which the stirrup must be applied 13 Triangular cuts

  gular lugs-16 and 17 of each wing 15 being opposite with respect to the longitudinal median plane of the stirrup (plane parallel to the spacer) In the example illustrated the triangular cuts

  lugs 16 and 17 of the two wings 15 succeed one another while opposing each other.

Claims (2)

  1 antenna consisting of a tubular spacer on which strands are fixed transversely each by a stirrup overlapping the spacer and the strand, characterized in that the stirrup has lugs penetrating the wall of the   tretoise and folded inside against this wall.   2 Method of assembling an antenna according to the res   dication 1, characterized in that a crimping bar   is threaded into the spacer, the strand is placed on the spacer ,.   the spacer and the strand are overlapped by a stirrup, a press-   Zion is exerted on the stirrup to penetrate its lugs in the spacer and fold them in contact with the crimping bar,   the crimp bar is removed.