Methods for manufacturing a spring, a spring brake, and a spring brake comprising a spring
AssigneeSomfy Activites SA
InventorEric Lagarde
Life of this patent
Estimating the term…
Abstract
Disclosed is a method for manufacturing a spring for a spring brake, including a shaping and cutting step f) including the following sub-steps: —f1) shaping a raw wire into a coil with a plurality of raw turns, the raw wire having: raw portions that extend from the end of the raw wire over at least one raw turn, and an intermediate portion between the raw portions, —f2) separating the first raw portion and the second raw portion of the raw wire by cutting, after implementing sub-step f1), and —f3) shaping a first tab (5), at a first end of the intermediate portion, after sub-step f1), and —f4) shaping a second tab (7), at a second end of the intermediate portion opposite the first end, after sub-step f1).
Claims23
A spring brake comprising:
- a friction member;
- and
- a spring comprising a wire wound in a plurality of turns, each of the turns being centered on a turn axis, the turns being included in a spiral according to which the spring is shaped, the spiral being configured to be coaxial with a main axis of the spring, the spring being mounted within the spring brake and in radial frictional contact with the friction member of the spring brake,
- wherein a first end portion of the wire, which extends from a first end of the wire, out of the spiral of the spring, is shaped according to a first tab,
- a second end portion of the wire, which extends from a second end of the wire, out of the spiral of the spring, is shaped according to a second tab,
- the first tab and the second tab are each directed in a substantially radial direction towards the inside of the spring,
- in projection in a plane orthogonal to the main axis, the first tab and the second tab are curved towards each other,
- the curvature of the first tab corresponds to the curvature of the turns, and
- the curvature of the second tab corresponds to the curvature of the turns.
A method of manufacturing a spring including a wire having a plurality of turns, each of the turns being centered on a turn axis, the spring being configured to be mounted within a spring brake and to be in radial frictional contact with a friction member of the spring brake, the manufacturing method comprising:
- conforming and cutting comprising:
- winding conforming a raw wire according to a plurality of raw turns, so that each of the raw turns is substantially coaxial with a common main axis, the raw wire having
- a first raw portion extending from a first end of the raw wire over at least one raw turn,
- a second raw portion extending from a second end of the raw wire, opposite the first end of the raw wire over at least one raw turn, and
- an intermediate portion between the first raw portion and the second raw portion;
- separating by cutting the first raw portion and the second raw portion of the raw wire after the winding conforming, the intermediate portion then becoming the wire of the spring, at least a portion of the raw turns of the intermediate portion becoming the turns of the spring;
- conforming by folding a first tab at a first end of the intermediate portion after the winding conforming and before or after the separating, the first tab being curved, the curvature of the first tab corresponding to the curvature of the turns;
- and
- conforming by folding a second tab at a second end of the intermediate portion opposite the first end, after the winding conforming and before or after the separating, the second tab being curved, the curvature of the second tab corresponding to the curvature of the turns.
Dependencies are inferred from the claim text.