FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
The Patent Rules, 2003
COMPLETE SPECIFICATION
1. TITLE OF THE INVENTION:
ELBOW BRACKET FOR AERONAUTICAL EQUIPMENT
2. APPLICANT:
Name: SNECMA
Nationality: France
Address: 2, boulevard du Général Martial Valin, F-75015
Paris, France.
3. PREAMBLE TO THE DESCRIPTION:
The following specification particularly describes the invention and the manner in which it is to be performed:

DESCRIPTION
The invention relates to an elbow bracket for aeronautical equipment.
Aeronautical devices such as turbomachines often include a quantity of auxiliary equipment surrounding them, notably electrical power cables and cables for transmission of signals and commands, and also fluid conveyance pipes, which must be kept close to the device. Elbow brackets are typically used, one side of which is attached to the structure of the device by bolts and the other end of which carries the cables, pipes and other elements by collars, pairs of spring plates or other means. Since these supports are generally produced by bending metal plates, they are of poor rigidity and they must be reinforced by ribs attached to both sides of the plate by edges. The ribbing is traditionally welded to the plate by a continuous bead or by points, which has the disadvantage that it greatly increases manufacturing times and increases the cost of these supports. The fundamental aim of the invention is to replace the welded connection of the ribs to the main plate of the supports by a connection which is simpler to establish.
In a general form, the invention relates to an elbow bracket for aeronautical equipment, including a main plate which has a side for attaching to a supporting structure and a side supporting the equipment, together with a reinforcing rib attached to inner faces of the said sides by edges, characterised

in that the rib is separate from the main plate (i.e. it remains a separate solid, in the absence of any welding or any close connection between them) and includes end-pieces traversing slots of the said plate, where the end-pieces are partially cut into by oblique slits partially extending in the slots to bottom portions of the slits and partially outside the slots, above external faces of the said sides, to emerging portions of the slits, where the end-pieces are twisted at end portions and extend beyond the slots as they engage on the external faces of the said sides.
The reinforcing rib is thus adjusted to the main plate of the support simply by twisting the end-pieces, which can be done using a common tool. Combined with the direction and position of the slits, this twist leads the rib to be trapped on the main plate, although they remain separate from one another, but the assembly is sufficiently robust.
The invention will now be described in greater detail by means of the following figures:
- figure 1 is a general view of a
traditional support,
and the other figures illustrate the invention:
- figure 2 is a general view of the
invention,

- figure 3 is a detailed view of the
assembly of the rib to the main plate, taken from the
side of the plate,
- and figure 4 is a view comparable to the
previous one, taken from opposite the plate.
The support of figure 1 includes a main plate 1 consisting of a first side 2 and a second side 3 combined with an angle 4 making a square edge or having another angle value. Sides 2 and 3 are still combined by a reinforcing rib 5 which presses on to them by means of two edges, respectively 6 and 7. The connection is made by welds. One of the sides 2 has bolts 8 for attachment to a structure 9 of an aeronautical device, and the second side 3 carries, in this particular embodiment, a collar 10 and a clamp 11 with two opposing spring plates to hold cables or pipes 12.
The invention is firstly represented in figure 2. It also includes a main plate 13 consisting of two sides 14 and 15 attached to a corner 16, and a reinforcing rib 17, the edges of which, 18 and 19, are pressing on respective inner faces 20 and 21, in the concave part of the main plate 13, of its sides 14 and 15. The contact of edges 18 and 19 is however a simple pressing action, without any welding. The main plate 13 has three slots 22, one of which is made through the first side 14, and the other two through the second side 15; and rib 17 has the same number of end-pieces 23, passing respectively through the slots 22. One of them therefore protrudes from edge 18 and the other two from edge 19.
Certain construction details will be described by means of figure 3. Each of the end-pieces 23 is partially cut into by a slit 24, the direction of

which is oblique and the position of which is chosen such that a bottom portion 25 of the slit 24 extends in the slot 22, but such that an emerging portion 26 extends out of this slot 22, above the outside face 27 of one of the sides 14 or of the other 15 of the main plate 13, when edge 18 or 19 is pressed on to the inner face 21 or 22. The twisting of one end 28 of the end-piece 23, above the slit 24, therefore moves it to the side of the slot 22 in such a way that a portion extends above the outer face 27, which has also been represented in figure 4. The friction produced by the upper face of the slit 24 on the outer face 27 leads edge 18 or 19 to be trapped on the inner face 20 or 21, and therefore holds the rib 17 in place on the main plate 13.
The support is unchanged compared with the traditional design as regards the attachment to the structure 9 of the device and to the pipes 12. The respective fastenings are on one or other of the sides 14 and 15.
Although the cohesion between the main plate 13 and the rib 17 appears to be less than with a weld, it has been observed that the resistance of the present assembly also gave the support equally satisfactory rigidity. It is however preferable that there should be three slots and end-pieces, as has been represented, in order for the assembly to be sufficiently firm, isostatic but without any wavering. Another construction precaution consists in being able to make the slots 22 oblong in shape, having a greater length in an alignment direction (parallel to that of edges 18 and 19), in such a way that there are plays in the slots 22, around the end-pieces 23, which are greater in this lengthening direction than in the

perpendicular direction, which is clearly shown in figure 2. It is then easier to position the rib 17.

We claim:
1) An elbow bracket for aeronautical equipment (12), including a main plate (13) having a side to be attached to a supporting structure and a side for carrying equipment, together with a reinforcing rib (17) attached to inner faces (20, 21) of the said sides by edges (18, 19), characterised in that the rib is separate from the main plate and includes end-pieces (23) traversing slots (22) of the said plate (13), where the end-pieces are partially cut into by oblique slits (24) extending partially in the slots to bottom portions (25) of the slits and partially outside the slots, above outer faces (27) of the said sides, to emerging portions (26) of the slits (24), and where the end-pieces are twisted at end portions (28) and protrude beyond the slots when they engage on the outer faces (27) of the said sides.
2) An elbow bracket for aeronautical equipment according to claim 1, characterised in that the slots are aligned and oblong, lengthened in a direction of alignment of the slots (22), where plays in the slots and around the end-pieces (23) are larger in the said alignment direction than in the perpendicular direction.
3) An elbow bracket for aeronautical equipment according to either of the claims 1 or 2, characterised in that there are three slots and three end-pieces, two of them on one of the sides and one of them on the other side.