FR2602286A1 - Method for fixing sheet metal reinforcing hoops around the periphery of the flanges of wooden reels - Google Patents

Abstract

Method for fixing U-shaped sheet metal reinforcing hoops 3 around the periphery of the flanges 1, 2 of wooden reels for conductors or cables, in which the edges 10, 11 of the flanges of the hoops are crimped inwards. The edges of the flanges of the hoops are crimped after these hoops have been placed around the periphery of the flanges. Application to reels for electrical conductors and cables.

Description

Method of fixing reinforcing hoops made of metal sheet on the periphery of the cheeks of wooden drums.

 The present invention relates to a method of fixing reinforcing circles of metal sheet in the shape of a U on the periphery of the cheeks of wooden drums for conductors or cables, method in which the edges of the circles are crimped inwards.

 It is provided by French standard NF-B-55007 that wooden drums for conductors and cables must include a circle of sheet steel, folded in a U-shape, on the edges of the cheeks of the drums. These circles, the sides of which are tightened by rivets passing through the cheeks of the reel, are subjected during the use of the reels to significant stresses, in particular during impacts, and tend to deform, which causes rapid deterioration of the reels.

 It has already been proposed to increase the rigidity of these circles to give the edges of the wings of the U a profile returning towards the inside of the cheek, before placing these circles on the cheeks. But this causes the presence between the wings of the circle and the periphery of the cheeks of an empty area of material, into which water seeps, which favors the rotting of the wood of the edge of the cheeks. Furthermore, it appears during the riveting operation of the wings of the circles a deformation thereof near the rivets.

 The object of the present invention is to provide a solid and stress-resistant attachment of the circles on the edges of the cheeks of the drums, without causing the formation of an empty area of material and deformation of the wings of the circles when they are riveted.

 The method according to the invention is characterized in that one performs. the crimping of the wings of the circles after placing them on the periphery of the cheeks.

 Preferably, a groove is formed on the internal rim of the profile intended to form the circles, before its bending at the radius of the cheeks of the reel, forming a crimp initiation, and after fitting this profile, the zones of the reel are pushed back into the cheeks of the reel. wings of the circle closer to their edges than the crimp caps.

 It is described below, by way of examples and with reference to the figures of the appended drawing, fastenings of a circle of metal sheet on the cheek of a reel according to the prior art and according to the invention, and their methods of implementation.

 Figure 1 shows the attachment of a circle on the cheek of a reel according to the prior art.

 Figure 2 shows the attachment of a circle according to the invention.

 FIG. 3 represents a profile intended to form a circle of metal sheet, provided with internal grooves intended to form bending primers.

 In FIG. 1, the two parts 1 and 2 of the cheek of a reel are enclosed on their peripheries, where they are narrower, by a steel circle 3, comprising wings 4 and 5, with edges bent towards the interior 6 and 7, pressing on cheeks 1 and 2. The circle is reinforced from place to place by rivets such as 8 pressing the edges of the wings against the external faces of the cheeks. However, there remain between the lateral faces of the cheek and the wings of the circle of the empty spaces 9, 10 in which water can accumulate, which promotes the degradation of the wood on contact with it. wings of the circle by the rivets causes a deformation of the latter in the vicinity of these rivets, which in particular tends to reduce the sealing of the contact between the extreme edges of the circle 6, 7 and the cheek 1, 2, thereby favoring the access of water in spaces 9, 10.

 In the binding according to the invention of FIG. 2, the wings 4, 5 of the circle are crimped onto the lateral faces of the corresponding cheek, so that they are applied against the lateral faces 1, 2 of the cheek and their edges 11, 12 penetrate into the wood of the cheek. There is therefore no longer an empty zone between the lateral faces of the cheek and the wings of the circle, which is favorable for the good conservation of the cheek wood and the moisture-tightness of its periphery.

The operation of fixing the strengthening circles to the cheeks is carried out as follows
It is preferably carried out beforehand during the profiling of the iron intended to constitute the circles of the grooves 13, 14 (FIG. 3) on the internal side of the branches of the U and near its edges.

 Then we bend the circles thus formed to the diameter of the cheeks, and apply the circles on the periphery of these. The wings of the U are then pushed back into the wood of the cheek by a crimping operation, so that the circles have in cross section the shape shown in FIG. 2. The rivets are then placed between the wings of the circles.

 The circle thus posed perfectly matches the wooden cheek. The end of the wings, thus set in wood, reinforces the fixation of the circle on the cheek, in particular during the drying or moisture recovery phases of the wood.

Claims (2)

1 / Method for fixing U-shaped sheet metal reinforcing circles (3) on the periphery of the cheeks (1, 2) of wooden drums for conductors or cables, in which the edges (10 , 1?) Of the wings of the circles, characterized in that the crimps of the edges of the wings of the circles are crimped after they have been placed on the periphery of the cheeks. 2 / A method according to claim 1, characterized in that one practices on the internal rim of the profile intended to form the circles, before its bending in the radius of the cheek of the drum, grooves (12, 13, Figure 3) forming primer crimping, and in that after the setting of the circle on the cheek we push in the cheeks of the drum the areas of the wings of the circle closer to their edges than the crimping primers.