L'invention concerne un ressort à cintrer (1) comprenant un corps creux (2) qui est équipé de moyens de préhension (3) facilitant la manipulation du ressort à cintrer (1) par un utilisateur.

Selon l'invention, les moyens de préhension (3) comportent une surface de préhension (6) ergonomique protégeant l'utilisateur lorsqu'il manipule le ressort à cintrer (1).

A wire bending device and a spring manufacturing machine are provided that are capable of bending a wire in a desired bending form without intermitting the processing operation.

A wire bending device (40), comprising a processing part (47a) having two protruding parts (47c, 47d) that protrude from an end surface of a pillar part (47b) and that bend a wire, wherein at least one of the protruding parts (47c) has a curved surface part, and the wire is disposed between the two protruding parts (47c, 47d), the pillar part (47b) is rotated around an axis of the pillar part (47b) to bend the wire along the curved surface part (47c), the bending device (40) comprises plural processing parts (47a), curvature of the curved surface part of the protruding part in each processing part (47a) are different, and the bending device (40) further comprises: a rotary part (47) that supports the processing parts (47a) and rotates about an axis intersecting the length direction of the pillar part (47b); an accommodating part (43) that is cylindrical and accommodates the rotary part (47) at an end part of the accommodating part (43) so as to be rotatable; and a mechanism that rotates the accommodating part (43) about an axis of the accommodating part.

The invention also relates to a spring manufacturing machine comprising such a bending device.

The spring is intended to form a directional damping mean, which presents the particular feature that the spirals (2) thereof are especially configured in such a way that when the spring is compressed, said spirals (2) and the upper spiral (3) itself, upon which the push force is applied, in addition to undergoing a vertical displacement, also undergo a crosswise displacement towards one side, depending on the orientation of the spirals (2), which gives rise to a directional damping of the force exerted on the body in which the springs (1) are applied, which may be a mattress (5), a seat, pillow or cushion, etc. Said spring (1) is obtained based on a method that consists in positioning a spring with conventional "S" shaped spirals and fastening it via the two end spirals thereof, in order to give rise to lateral pushes on the intermediate spirals, in order to deform said spirals, which alongside a displacement of the spirals, results in the same passing from a conventional "S" shape to an approximate "Z" shape, the thermal treatment of the spring assembly being carried out in order to achieve the definitive conversion thereof.

Bei einem Verfahren zum Herstellen einer Öse (10) am Ende eines aus einem Drahtstrang geformten Federkörpers (2) wird zunächst der Drahtstrang von zwei Greifbacken (6,7) einer Greifzange (5) erfaßt, zwischen ihnen festgehalten und danach in einem vorgegebenen Abstand hinter der Greifzange (5) unter Ausbildung eines hinter dem Federkörper (2) vorstehenden hinteren Drahtabschnitts (4) abgetrennt. Dabei wird der eine Greifbacken der Greifzange (5) in Form eines der Ösenform entsprechenden Formbackens (7) eingesetzt, um den der Drahtabschnitt (4) mittels eines direkt hinter dem anderen Greifbacken (6) senkrecht zur Längsmittellinie (L) des Drahtabschnitts (4) über letzteren einfahrbaren Formungsstiftes (9) zur Ausbildung der Öse (10) herumgebogen wird. Die hierfür erforderlichen Relativbewegungen zwischen Formungsstift (9) und Formbacken (7) werden durch programmgesteuerte Bewegungen von Greifzange (5) und/oder Formungsstift (9) erzeugt.

Die Erfindung betrifft auch eine Vorrichtung zur Herstellung solcher Federn.