FR2470282A1 - RIVER PUNCHING NUT - Google Patents

Abstract

IN THE BORING OF THIS NUT INTENDED TO BE SHAPED IN A SHEET 19, AN ANNULAR FLANGE 12 DIRECTED TOWARDS THE AXIS OF THE NUT DELIMITS A HOLE 13 WHOSE DIAMETER IS AT LEAST EQUAL TO THAT OF THE CORE OF THE SHEET SCREW INTENDED TO BE SCREWED INTO THIS NUT. IN THE AXIAL DIRECTION, THIS COLLAR EXTENDS A DISTANCE AT MOST EQUAL TO THE PITCH OF THE THREAD OF THE SCREW. THE SIDES 14, 15 OF THE COLLAR 12 ARE INCLINED, THUS GIVING THE COLLAR A TRAPEZOIDAL SECTION.

Description

- 1 -

The present invention relates to a punch nut -

neur and to river comprising a part which constitutes

  the body and has a generally shaped attack face

rectangular strip which operates the punching and on which the riveting operation is carried out, this nut body having, on two opposite sides of this

  body, at least two edges which extend towards the ex-

  along the entire length of these two sides, are parallel to said attack face and distant from

this and define a sensitive pressure facedcb-

ment parallel to the leading face, while between the latter and the shoulder faces of said edges the nut body has at least two lateral faces in each of which is formed a longitudinal groove, said nut body being traversed by a bore perpendicular to its leading face. In known nuts of this type, for example in that described in invention patent DE 1 072 432, the bore perpendicular to the leading face is tapped continuously between this face and the pressure face. This tapping% t, over the entire length of the 8tre bores several times engaged with the thread of a screw and therefore allows relatively large forces to be transmitted between the screw and the nut. In the case of an assembly of two

panels, for example from two t5les, such a transmitted-

  Effort is often of secondary importance.

This is why panels are frequently assembled by tapping screws (Parker type screws), the threading of which is relatively long, therefore with a relatively large distance between two successive sides of the thread. The nut known by this patent, but which is not to be used for Parker screws, can, it is true, be fixed to a panel while saving machining,

because the nut itself punches the panel to form

sea the hole in which it is simultaneously fixed.

2470282 1

-2- We also know separate nuts in thin t8le, as well as the possibility of providing directly in a panel the thread characteristics

  essentials of these t8le nuts. A form of exe

cution of such a separate nut or formed directly in a panel has a bore which is provided with a radial slot and is a little larger than the diameter of the core of a screw. When a Parker type screw is screwed into this t8le nut, the tab formed by said slot and which penetrates into the thread of the screw

forms a helical line with a single pitch.

  Another known tale nut has two parallel slots and a square bore which at two opposite angles

square, opens into the corresponding adjoining slot

  dante. In this nut the two legs cut out and pe-

  entering the screw thread form a line

  helioo! dale which however extends over a shorter distance

one step closer.

  The disadvantage of these separate sheet metal nuts is that they require an operation to puncture the panel so that the nut can be attached to it. In addition, these t8le nuts usually in the form of curved plates with spring effect have their edges.

  directed towards the panel when they are placed.

When tightening, their curvature disappears while their angles gradually move away from the axis:

during this movement, the surface of the panel is

  wind damaged by angles, and scratches as well

caused by the protective coating on the panel

  wind build up primers of rust.

The disadvantage of damage to the surface of the panel also exists in the case of a sheet metal nut formed directly in a panel, because when a Parker screw is placed in the panel, the part of oelui- that around the nut becomes deformed, which can cause cracks in the protective varnish layer. Both in the case of separate t81e nuts and in

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2470282!

  _4_ that this collar may have, in axial section, a shape, for example trapezoidal. The invention ensures on the one hand that during the screwing the screw will cut in the annular flange of the nut a continuous helicood, on the other hand that this tapping with single pitch independent of the mechanical resistance of the t8le will be engaged with

  the screw without the thread of the nut showing pre-

  definitely signs of subsidence.

The annular flange can be placed in a plane parallel to the leading face of the nut, or in an inclined plane on this face. In this last oash the penetration of the sides of the screw thread into the material. the collar is made easier and, moreover, the fact that the sides of the net attack the collar on longer portions ensures better

holding the assembly.

  The bore of the nut is, in the face field

preferably bevelled attacks. Thanks to this change

eto brake in conjunction with the flange of the flange

20..clipped towards the leading face of the nut

  as well as the optional annular collar

  oliné compared to this faoe, we can introduce

in the bore of the nut of the screws which center there self

matically, especially when their screwing is done by machine. In addition, a non-coaxial introduction of a screw is also made possible, without risking oversizing the thread, even when the screw

is placed and removed several times.

  In a preferred embodiment the bore of

the eorou has a diameter which is not greater than the diameter

external meter of the thread of the Yis. In the screwed state the flanos of the threads of the Parker screw can thus penetrate not only into the annular flange, but also into the wall of the bores so that if a screw is screwed several times in succession in the nut

  it is guided in the tail thread marks

  lées in the dito wall during the first screwing, and this preferably with the annular collar- provided in the

? 470422)

  - 5 - lower part of the nut. The assembly acquires

thus better cohesion.

  The nut according to the invention also allows, because of its relatively high mechanical strength compared to that of the material constituting the panel and that of known sheet nuts q a couple

  high tightening when the screw penetrates.

A particular advantage of the invention also resides

their in the fact that even when the screw was more

a few times in turn screwed into the nut and unscrewed from it, a constant tightening torque, always reaching the initial high level, can be obtained. In addition, since this nut can emboss the hole in the panel in which it will be fixed, it makes it possible to save an operation compared

  nux separate t8le nuts mentioned in the preamble.

The nut according to the invention can be placed in a bowl pressed into the panel, the leading face of the nut then being, in this bowl # recessed with respect to the main face of the panel in which the bowl. It is thus ensured that at least one plane of the panel fitted with this nut remains

clear of any part thereof projecting above

above him. It is only when this panel fitted with the nut is assembled to a counter panel that the leading face of the nut can come into contact with the counter panel, for example by ensuring that the material of the counter panel is pushed into the bowl of the panel fitted with the nut, which also creates a boxed assembly. This bowl shape which ensures the bottling can be ensured or facilitated by dimensioning accordingly a washer which can possibly be fixed to the screw to form with

this an assembly assembly in which the round-

  delle is arranged between the head of the screw and the counter

sign. The invention is described in more detail below, using a preferred embodiment illustrated in -6 - drawing; on the latter - Figure 1 is an axial sectional view of a punching nut and riveting fixed in a bowl of a panel, the leading face of this nut being withdrawn from the main face of the panel in which is the bowl, - Figure 2 is a plan view corresponding to fig. 1, and - Figure 3 is a view, partially in section and partially in elevation, of an assembly of two t8les made with a nut according to fig. 1 and fig. 2. Figs. 1 and 2 show a nut 1 (in this example a punching and / or riveting nut, for simplicity called "riveting punching nut" in the remainder of this text) which consists of a body 2 of generally rectangular shape having a attack face 3 of general shape which is also rectangular. Two ledges 4

  outwardly extend across the entire

  gor of this body, along two sides opposite one another. These edges 4 are flush with a pressure face opposite to the attack face 3, and each of them has a shoulder face 6 facing the face.

  attack 3 but located at a distance from this rear.

  Between each of the shoulder faces 6 and the face

  attack 3 extends a lateral face 7 in its

seems IPendicular to these faces 6 and 3; both

  lateral faces 7 each have a long groove

tudinale 8 whose section is in the general shape of letter U. An inclined wall 10 connects the bottom 9 of this

groove on the shoulder face 6. The body 2 is tra-

poured through a bore 11 perpendicular to the leading face 3. In this bore is provided an annular collar 12 projecting inwardly which forms and delimits a core hole 13. This collar has flanks 14, 15 which, from the wall 16 of the bore 11, are inclined towards the core hole 13 and towards one another, so that the collar has an axial section of trapezoidal shape. In addition the bore -7 -

11 presents from the side of the attack face 3. a change

brake 17 7.

The riveting punch nut 1 is, on a plate 19 in which a cup 18 has been stamped, arranged so that the shoulder faces 6 of the two flanges 4 are in contact with a main face 20 of the t8le 19 and that the body 2 which has the leading face 3 penetrates into the bowl 18 of the t $ le 19 by crossing the latter. The attack face 3 of the nut 1 is located below the plane of the other

main face 21 of t8le 19.

  Are shown in fig. 3 two sheets 19 and 22 assembled to each other by the punch nut

  river 1I a cap screw 23 and a washer 24.

  The riveting punch nut is placed in a bowl 18 of the t8le 19, as described above with reference to FIGS. 1 and 2. On the main face 21 of this

  tole rests a counter-t8le 22 in which was prepared

  ticked a hole 25. The washer 24 is located on that of the faces of the counter-t8le 22 which is opposite to the t8le-19. The bore of this washer is designated by the reference 26. The bore 11 of the nut 1 and the

  hole 25 of the counter 22 and the bore 26 of the round

of which 24 are coaxial. The hexagonal head 27 of the screw 23 is applied against the free face of the washer 249 - and its threaded fft 28 passes axially through the bore 26,

the hole 25, the bore 11 and the core hole 13.

The bore 26 of the washer 24 and the hole 25 in the counter-tear 22 have a diameter greater than the outside diameter of the threads of the screw 23. On the other hand, the bore 11 of the nut 1 has a diameter such that the fat 28 is, in the field of the crest of its thread,

  closely surrounded by the wall 16 of this bore.

  The relative dimensions are preferably such that the thread of the screw 23 bites into the wall 16, which ensures the additional advantages already mentioned; but the invention provides its essential advantages even

if this characteristic is not achieved. Glue-

  annular rette of trapezoidal axial section 12 east

2470282!

-8 - engaged in a thread 29. The core hole 13 in the flange 12 has a diameter barely larger than the core 30 of the screw 23. The thread of the latter is thus engaged with the flange 12 on a length which, in this example of execution, is equal or at least almost equal to the length

  oiroonference of a turn of the screw thread.

  The counter-t81e 22 is swung into the bowl 18 and is applied against the attack lance 3 of the nut 1. This counter-sheet therefore also includes a stamped bowl 31 whose diameter is determined by that of the washer 24 in contact with this plate and is such that the bowls 18 and 31 are embedded in one another. However, this recessed arrangement does not have to be carried out in all

  the application cases of the invention.

In the exemplary embodiment illustrated in FIGS. 1 to 39 the eorou is of the punching type, that is to say that this nut drills itself in the sheet metal the hole in which it will be fixed there this arrangement is not either

  imperative for the application of the invention. In some

very few oas of use, the punching nut can be, after introduction into the plate, subjected to an operation

riveting which will ensure an even better retention.

For this purpose, the area of the angles of the leading face 3 can be flattened so as to extend further beyond the underlying edges of the t8lo 19 than has been shown in FIG. 1. As already mentioned,

  the invention can obviously be implemented equally

  only with purely riveting nuts, so no

necessarily punchers.

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24702! 2

  -10- that the sides (14 $ 15) of the annular flange (12) are inclined towards the core hole (13)

and towards each other.

  6. Rivet punching nut according to one

  conch of the preceding claims, remarkable in

what the axial section of the annular flange

(12) is trapezoidal!

7. Rivet punching nut according to one

  of previous claims, remarkable in

that the annular flange (12) is arranged in

a plane parallel to the leading face (3) of the nut.

  8. Rivet punching nut according to one

conch of claims I to 6, remarkable in that

that the annular flange (12) is located in an inclined plane relative to the leading face (3) of

the nut.

  9. Rivet punching nut according to one

any of the preceding claims, remarkable on

what in the field of the attack face (3) "talé

sage (11) of the nut has a chamfer (17).

  10. Riveting punch nut according to one

conch of the preceding claims, remarkable in

  that the bore (11) of the nut has a diameter that is not greater than the outside diameter of the thread of the

screw (23).

  11. Rivet punching nut according to one

conch of the preceding claims, set out in

  that the nut (1) fixed to a pannenu (19) is arranged

in a bowl (18) thereof.

12. Rivet punching nut as claimed

  cation 11, remarkable is that the leading face (3) of the nut (1) is in this bowl, recessed by r.pport to the main face (21) of the panel (19)

in which sm finds the bowl.

  13. Riveting punch nut according to one

any of the preceding claims, remarkable in that

  that the screw (23) is associated with a washer (24) whose dimensions are such that after assembly the material of the

counter panel (22) in contact with this washer has penetrated

  very in the bowl (18) of the panel (19) provided with the nut (1) and is in contact with the attack face (3)

of the nut.