FR2545556A1 - Method for manufacturing dismantleable and adjustable safety connecting rods and connecting rods obtained by this method - Google Patents

Abstract

The subject of the present invention is a method for manufacturing safety connecting rods comprising a clevis at one of their ends, in which two tubes fitted into each other are used. According to the invention, the two tubes are immobilised by a mandrel or threaded tie-rod 6 and the clevis is then formed simultaneously on the two tubes 1 and 2 thus immobilised.

Description

Method for manufacturing removable and retractable safety rods

  glables and connecting rods obtained by this process.

  Tubular connecting rods with constricted ends have many

  applications in both mechanics and aeronautics They can be used, for example, as control rods for

  flight, or as floor support or wing tie rods.

  it is sometimes necessary, for security reasons, to

  double these rods When there is no problem of clutter-

  ment, it suffices to parallel two complete chains of connecting rods. But this provision is not applicable when the

available space is reduced.

  We know safety rods called "Fail Safe" l which

  formed of two tubes threaded one inside the other If one of the tu-

  bes for example breaks, the other tube continues to ensure: the transmission of the force But the rods of this kind until

  present are neither removable nor adjustable.

  The present invention relates to a method of manufacturing safety rods, comprising a yoke at one end, which

  instead allows to obtain removable and adjustable rods

wheat.

  The method according to the invention, in which two tu-

  bes strung one inside the other, is characterized in that one immo-

  bilise the two tubes by a mandrel or threaded tie and in this

  then form the yoke simultaneously on the two tubes thus

if immobilized -

  Under these conditions, after forming the connecting rod, one can

  screw or unscrew the tie rod, so adjust the length of the connecting rod

  If you disassemble the connecting rod, the threads of the two tubes remain in concordance, so that you can replace the tie rod

without difficulty.

  In an advantageous embodiment of the invention,

  one end of the inner tube on a file mandrel

  tee, the inner tube is plugged into a long outer tube

  geur larger so that this outer tube protrudes pax relative to the threaded end of the inner tube, we shrink the

  projecting part of the outer tube on a threaded mandrel identi-

  that at the first, the two tubes are pivoted so as to bring the threads of the two ends of the two tubes into agreement and

  we screw an adjustment tie in these ends.

  -2 - The invention also relates to safety connecting rods

obtained by this process.

  We have described below, by way of nonlimiting example, a

  mode of implementing the method according to the invention, with reference

this in the appended drawing in which:

  Figures 1a to 1c are views in longitudinal section shown

  trant the forming of the inner tube; Figures 2 a and 2 b are views in longitudinal section showing the forming of the outer tube;

  Figure 3 shows in longitudinal section the two tubes in

  spun into each other; Figure 4 shows the formation of the constriction of the projecting end of the outer tube; Figure 5 shows the two tubes assembled; Figure 6 shows in longitudinal section the completed connecting rod;

  Figure 7 is an end view of the connecting rod.

  The connecting rod manufactured according to the invention comprises an integrated body

laughing 1 and an external body 2.

  The inner body 1 is formed by a tube 3 (Figure la), one of the ends of which is first shrunk 3 a on a threaded mandrel (Figure lb). The central part 3 b of the tube is then shrunk.

  so as to give it the outside diameter of the end 3 a (Fi-

gure lc).

  The outer body 2 is formed from a cylindrical tube.

  than 4 (Figure 2 a) whose inside diameter is equal to the outside diameter of the tube 3 and which is longer than this tube 3 One of the ends and the central part of the tube 4 is constricted so as to

  give the constricted part 4 has an internal diameter equal to the diameter

  outer meter of the constricted part 3 a-3 b of the inner body 1.

  The inner body 1 is inserted into the outer body 2

  which then protrudes from the body 1 (Figure 3).

  The projecting part of the body 2 is then constricted on a threaded mandrel 5 whose diameter and pitch correspond to those of the

  thread formed in the end 3a of the body 1 (Figure 4).

  Then the body 1 is pivoted relative to the body 2 so that

  lesson in matching the thread of the end 3 a and that of the mandrel 5, and the mandrel 5 is replaced by an adjustment rod

  6 that is screwed into this end 3 a (Figure 5).

  Finally, the two rod bodies 1 and 2 are simultaneously constricted, held together by the tie rod 6, at their opposite end -3- to this tie rod (Figures 6 and 7), so as to form the yoke The holes 7 are made while the two bodies 1 and 2 are

assembled together.

  The various shrinking operations can be done for example by hammering or with the press. It goes without saying that the present invention should not be con

  considered to be limited to the embodiment described and represented

  té, but covers, on the contrary, all the variants.

4 -

Claims (3)

  1 Method for manufacturing safety connecting rods comprising a yoke at one of their ends, in which two   tubes threaded one inside the other, characterized in that one immobilizes   se the two tubes by a mandrel or threaded tie rod 6 and in that the yoke is then formed simultaneously on the two tubes thus immobilized. 2 Method according to claim 1, characterized in that one of the ends of the inner tube 1 is constricted on a threaded mandrel, that the inner tube 1 is fitted into an outer tube 2 of greater length so that this tube outside protrude from the threaded end of the inner tube, which   shrinks the protruding part of the outer tube on a solid mandrel   smoothness 5 identical to the first, that we rotate the two tubes 1   and 2 so as to match the threads of the two ends   mites of the two tubes and that a tie rod 6 in. these ends.   3 connecting rod obtained by the process defined in claim 1 or 2.