FR2844853A1 - Multi-arm deflection spring, e.g. for bed spring or mattress, is made from twisted filaments impregnated with a thermo-setting resin - Google Patents

Abstract

The spring, shaped with multiple arms operating by deflection and connected by a framework, is made from twisted filaments produced on a four-axis multi-spindle winding machine and impregnated with a thermo-setting resin. The framework can be made from the same material or from wood, composition material or aluminum tubing.

Description

- 1

  l'mivention relates to a flexion spring, of new design, called multi-arm, made of composite material, fiber and thermosetting resin.

  On the current market, in particular bedding, there are two types of spring, one metallic, cylindrical or bi-conical, it is a compression spring, the other, is a leaf bending spring (wood or composite). These two types of flexion or compression spring have a unitary movement. The spring which is the subject of the invention has a characteristic which distinguishes it from the others: it is a multi-arm bending spring, the material of which it is composed is a composite: fiber and thermosetting resin (FIG. 1). More precisely, a multitude of arms working in flexion are connected to each other by a frame, the frame and the arms being composed of the same rope element.

(figure 1).

  The general shape of the multi-arm spring differs depending on its use:

box spring or mattress (Figures 2 and 3).

  1 5 Compared to the metal spring, for an equal surface, the composite multi-arm spring weighs only a quarter of the metal spring. And in comparison with a leaf spring whose flexion is unitary, the multi-arm spring has 40

  60 bending points for the same length of use.

  Another advantage of the multi-arm spring made of composite material, it does not fear oxidation.

  On the other hand the manufacture of this spring object of the invention is achievable

  industrially on a multi-spindle filament winding machine.

  This multi-arm spring object of the invention can be used for many applications: box spring and mattress in the field of bedding, flexible coating for gratings, floor in construction

nautical, etc ...

- 2

  The description which follows, given by way of example, is not limiting.

  The basic element is a set of continuous wires, such as roving, soaked in a thermosetting resin, twisted to avoid

  delamination, whose final shape resembles a fine rope, from 0 515 to 30/10 mm.

  This twisted rope is distributed using a 4-axis filament winding machine, the axis of rotation of which has an inversion control for

  be able to turn in both directions at will.

  The rigid mandrel positioned on the machine, has the internal shape of the spring, it has pins which allow the rope to take the shape of the arms of the

spring, as well as its framework.

  All these machine operations are programmed using a

numerical control.

  The work which follows differs according to the end use of the spring, for example, FIG. 2 represents a double multi-arm spring in

  opposition, joined by a frame, wood, composite, aluminum tube or others.

  Before demoulding work, the spring is introduced into an oven, the temperature and passage time of which depend on the quality of the resin used. All the following works depend on the use of multi-arm springs,

subject of the invention.

- 3

Claims (1)

CLAIM   1 - Filament bending spring, in fiber composite and thermosetting resin representing a rope: characterized by a multitude of arms working in bending, connected to each other by a frame. The frame and the arms being composed of the same rope element (figure 1).