FR2861824A1 - Roller or pulley, e.g. for a sliding door guide, has metal side flanges and rim of synthetic material - Google Patents

Abstract

The roller or pulley consists of a rim (1) of a synthetic material with metal flanges (3a, 3b) in the form of discs or rings, e.g. of stainless steel, fixed to its two sides (1a, 1b) by screws (6). The diameter of the side flanges is at least equal to that of the rim sides, and the hub (2) of the roller or pulley has a ball bearing fixed in place when the rim is moulded.

Description

2861824 1

  The invention relates to a roller or sheave and more particularly to a roller or guide roller.

  The rolling rollers, in particular for sliding or rolling gates, are generally made from an alloy, for example copper-based or brass-based, the hub of which is generally provided with a crimped ball bearing. The rollers all stainless steel are also imaginable but their cost is important, especially for machining reasons.

  A metal roller and more particularly alloy, despite its cost, has certain advantages of strength and corrosion resistance.

  -However, the rails on which the rollers are intended to roll are usually metal which creates a particularly noisy metal-to-metal contact.

  This is the reason why there are also rollers entirely made of synthetic material and in particular polyamide.

  Such rollers have advantages including quiet operation and ease of manufacture by molding.

  However, these rollers are quite fragile in particular shock and risk of damage during transport of a portal equipped with such rollers during their use during which the rollers are likely to meet various obstacles such as gravel, for example .

  This is why the inventor has sought and found the means to manufacture a roller which has the strength advantages of a metal roller and the advantages of rolling and manufacturing a plastic roller.

  If the invention relates to rollers in particular rolling, it also relates of course sheaves pulleys or the like.

  A roller or sheave according to the invention, provided with a rim of synthetic material, is particularly remarkable in that on each side of said rim is fixed a metal flange in the form of a disk or a circular ring.

  The metal flanges stiffen the rim and protect it from impacts more particularly on its edges, whether said rim is grooved or not.

  The inventor has found a simple and effective solution contrary to what one could have imagined, to obtain the aforementioned advantages by seeking, for example, to achieve a tread made of synthetic material on a metal rim ...

  Advantageously, the synthetic material used for the rim is a polyamide and each flange is made of stainless steel, while the diameter of the flanges is at least equal to that of the flanks of the rim and preferably slightly higher.

  According to one embodiment, the roller or sheave according to the invention has a ball bearing hub and for example, the ball bearing hub is arranged in an insert during the molding of the rim.

  For the fixing of the flanges, several embodiments can be imagined but the invention recommends a remarkable embodiment in that the metal flanges are fixed on the flanks of the rim by screws, the screws being advantageously screwed on each flank of the rim through the holes of the flanges angularly offset from one flank to the other.

  For example, in this case, the screws are three in number per flank and form substantially an equilateral triangle, the triangles thus formed from one side to the other being angularly offset from one another by substantially 60 degrees.

  The invention will be better understood on reading the description which follows and which refers to the appended drawings in which: FIG. 1 is an exploded view of a roller according to the invention, FIG. In perspective of the roller of Figure 1 after assembly, - Figure 3 is a plan view of the roller of Figures 1 and 2 laid flat, - Figure 4 is a view through the edge of the roller of Figures 1 to 3.

  The embodiment shown in the drawings is a rolling roller which consists of a rim 1, having two sidewalls 1a, 1b and here a groove 1c, originating from a molding of a synthetic material and in particular the polyamide.

  The molding is carried out, according to one embodiment, by providing a ball bearing insert 2 to form a rotary hub for a shaft or an axis, for example. However, depending on the use, a ball bearing is obviously not always necessary.

  On each of the flanks 1a and 1b of the rim 1 is applied and attach a flange 3a, 3b, for example stainless steel, but it could be another metal or an alloy, preferably stainless .

  The flanges 3a, 3b are in this example in the form of circular rings, that is to say disks provided with a circular central opening to reach the rotary hub 2.

  In addition to lightening holes 4 (FIG. 1), the flanks 1a, 1b of the rim 1 each have threads such as 5, here three in number, forming an equilateral triangle.

  The threads 5 are intended to receive screws such as 6 which pass through corresponding holes 7 formed on the flanges 3a, 3b, in order to firmly fix the latter on the rim 1. However, the threads 5 could be removed, the screws 6 being then for example self-tapping or screw type sheet.

  As shown in Figure 1, the triangles formed by the screws 6 or the holes 7 on each flange are angularly offset from each other by about 60.

  In this way, the screws from one flange to the other are not coaxial and are regularly distributed.

  As shown in FIG. 2, the flanges 3a and 3b here have a diameter slightly greater than that of the flanks 1a, 1b of the rim 1.

  If the embodiment described relates more particularly to a roller, as already said, it could be another type of roller or a sheave pulley.

Claims (9)

  1) Roller or sheave, provided with a rim (1) of synthetic material, characterized in that on each side (1a, 1b) of said rim (1) is fixed a flange (3a, 3b) s metal in the form of 'a disc or a circular crown.   2) Roller or sheave according to claim 1, characterized in that the synthetic material used for the rim (1) is a polyamide.   3) roller or sheave according to one of claims 1 and 2, characterized in that each flange (3a, 3b) is stainless steel.   -4) Roller or sheave according to one of claims 1 to 3, characterized in that the diameter of the flanges (3a, 3b) is at least equal to that of the flanks (la, lb) of the rim (1).   5) Roller or sheave according to one of claims 1 to 4, characterized in that it has a ball bearing hub (2).   6) Roller or sheave according to claim 5, characterized in that the ball bearing hub (2) is arranged in insert during molding of the rim (1).   7) roller or sheave according to one of claims 1 to 6, characterized in that the metal flanges (3a, 3b) are fixed on the flanks (la, lb) of the rim (1) by screws (6).   8) Roller or sheave according to claim 7, characterized in that the screws (6) are screwed on each side (1a, ib) of the rim (1) through holes (7) of the flanges (3a, 3b) of angularly shifted from one flank (1a) to the other (1b).   9) Roller or sheave according to claim 8, characterized in that the screws (6) are three in number per flank (1a, 1b) and form substantially an equilateral triangle, the triangles thus formed from one flank to the other being angularly offset from each other by substantially 60 degrees.