The present invention relates to a support bracket for supporting elements for forming a cable tray.
It is conventional practice for a cable tray to be produced by assembling U-shaped elements end to end. The cable tray thus obtained is then fixed to a wall using brackets, or suspended from a ceiling by a hanger, amongst other possibilities.
The width of these cable trays can vary according to the number of cables to be installed. Thus, by way of nonlimiting example, there are cable tray elements with standardized widths of 50, 100, 150, 200, 300, 400, 500, 600 mm or more.
An existing bracket, used in this application, is formed by bending a metal sheet. It comprises a part of trapezoidal shape, forming the actual bracket, a vertical edge pierced with holes to allow the bracket to be fixed to said support wall, and a horizontal edge pierced with holes and notches to house the cable tray element facing the bracket. These notches can house parts of this cable tray element, the latter being made of metal wire mesh or perforated sheet, while the holes house fixings comprising clamping bolts.
This bracket has the disadvantage of being relatively expensive to manufacture on account of its design. As cable trays can actually be installed in places to which access is difficult, it may therefore prove difficult to fit the fixings. In addition, the notches, holes and dimensions of this bracket are tailored to the fitting of an element of determined type and determined dimensions. As a result, it is necessary to have numerous different types of bracket in order to satisfy the requirements, and this constitutes a significant practical constraint. These various types of bracket may prove relatively difficult to manage on site.
The present invention aims to overcome all of these disadvantages.
To this end, the bracket to which it relates comprises:
a base piece intended to be fixed to a support wall; this base piece comprises, on its side intended to be fixed to this support wall, at least one locking means able to house part of the cable tray element facing the bracket, and to lock this element in a horizontal direction perpendicular to the cable tray;
a moving piece, mounted on the base piece and comprising at least one locking means shaped to engage with said cable tray element by a simple displacement of this moving piece toward this element; this moving piece is moveable between an engagement position, in which it is possible to engage said cable tray element between the locking means that the base piece and the moving piece comprise, and a locking position, in which these locking means are engaged with said cable tray element; and
means of keeping the locking means that the moving piece comprises in said locking position.
To fix a cable tray to one or several brackets, all that is then required is for the moving piece to be brought into said engagement position, for the cable tray element lying facing the bracket to be engaged in each locking means of the base piece, then for the moving piece to be moved toward said locking position, so that the locking means (singular or plural) that the latter comprises engage with this cable tray element.
The bracket according to the invention thus makes it possible for the cable tray to be mounted very quickly and easily, particularly when the cable tray needs to be installed in a rather inaccessible place, giving a very dependable assembly. In addition, this bracket is suited to numerous types and/or sizes of cable trays and thus makes it possible to reduce the number of types and sizes of bracket needed. The bracket according to the invention also retains a simple structure that is also inexpensive to produce.
Advantageously, each locking means that the base piece comprises is shaped in such a way that the cable tray element has to be inclined in order to be able to engage with it, and each locking means that the moving piece comprises is shaped so that when it is engaged with the cable tray element it prevents any lifting of this element with respect to the bracket.
As a result, the cable tray element cannot in any way become inclined after it has been fitted and locked onto the bracket, and this ensures that it is mounted perfectly.
According to one option, said holding means consist of an elastic member shaped to allow the moving piece to move between said engagement position and said locking position and to return the moving piece to the locking position.
All that is then required is for the moving piece to be grasped and brought, against the elastic force of said elastic member, into said engagement position, and then for this moving piece to be released so that it can return to the normal locking position.
According to another option, each locking means that the moving piece comprises consists of a hook, and said holding means consist of a deformable structure of this hook such that this hook can be deformed over the part of the cable tray element around which it is engaged.
This or these hooks, in combination with the locking means (singular or plural) belonging to the base piece, prevent any movement of the cable tray with respect to the bracket, which means that deforming them allows the cable tray element to be locked perfectly onto the bracket.
Each hook is advantageously made of a metallic material and is shaped in such a way that it can be deformed by using a hammer.
According to yet another option, said holding means consist of at least one clamping means able, when tightened, to immobilize the moving piece with respect to the base piece.
Advantageously, the base piece is tabular and the moving piece is engaged telescopically in the base piece.
The bracket thus formed allows the moving piece a relatively long sliding travel, maintaining good rigidity. This bracket can therefore house cable tray elements of very varying widths, while at the same time ensuring that these elements are mounted perfectly on the support wall.
According to one option, more especially suited to cable tray elements made of metal wire mesh, each locking means that the base piece comprises consists of a notch formed in an upright of the base piece which extends over the surface of this piece housing the cable tray element.
As a preference, each notch is delimited at its lower end by an inclined edge forming a ramp.
This inclined edge allows the cable tray element to be guided into the notch when this element is simply moved along the bracket in a direction transverse to the cable tray.
Fitting the element on the bracket thereby becomes appreciably easier.
According to another option, more especially suited to cable tray elements made of perforated metal sheet, each locking means that the base piece comprises consists of a tab, of inflected shape, comprising a part able to be engaged inside the cable tray element, through an opening that at least one of the side walls of the cable tray element comprises.
Advantageously, the base piece comprises two parts, namely a part known as the “fixing” part, intended to allow the bracket to be fixed to a support wall, and a part known as the “housing” part, intended to house and to support said moving piece.
These two parts may be fixed together. However, as an alternative,
said fixing part has a length such that it may comprise a number of the aforesaid locking means, staggered along this length, and a number of means for assembling it with said housing part, these being staggered accordingly, and
said housing part comprises means for assembling it with the fixing part, it being possible for these assembly means to collaborate with the assembly means belonging to the fixing part so as to allow the housing part to be assembled in several possible positions staggered along the fixing part.
It thus becomes possible to adjust the position of the housing part with respect to the fixing part, or several housing parts can be fitted onto one and the same fixing part so as to set out several superposed cable trays.
According to one possible embodiment of the invention, in this case,
said fixing part is formed of a section piece of C-shaped cross section and said housing part is formed of a tabular section connected to the fixing part at right angles to the latter; the fixing part comprises at least one means for fixing it to the support wall, and has two lateral flanges each of which comprises a notch like the aforesaid one; said housing part is housed inside said fixing part and has a longitudinal slot opening into its upper face; and
the moving piece comprises a section piece of C-shaped cross section, shaped to be able to be engaged with sliding inside said housing part; this C-section of the moving piece comprises at least one hook fixed to the intermediate wall of this section, on the exterior face thereof.
According to another possible embodiment of the invention,
the base piece comprises a part of trapezoidal shape, a vertical edge pierced with holes, to allow this base piece to be fixed to said support wall, and a horizontal edge; and
the moving piece has the cross section of an inverted L, part of which sits along said part of trapezoidal shape and the other part of which forms a horizontal edge which is pressed against the horizontal edge of the base piece.