Horological movement comprising a flat hairspring

European Patent Office Patent

PATENT NO 2175328
APP PUB NO EP-2175328-A2
SERIAL NO

10151818

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Abstract

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The spring (10) has windings that are made of a single band extending from an inside curve (11) to an outside curve (14). The inside curve is extended by a self blocking washer (17) that allows the spring to be fixed on axis (9) of a balance-wheel. A rectangular section having a non-uniform thickness (e) is presented between an attachment to a center and an attachment to outside. An independent claim is also included for a method of manufacturing a hair-spring from a board in an amorphous or crystalline material.

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Patent Owner(s)

Patent OwnerAddress
ETA SA MANUFACTURE HORLOGERE SUISSECHGRENCHEN

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Inventor(s)

Inventor Name Address
CONUS THIERRY 2543 LENGNAU
TRUMPY KASPAR 4500 SOLEURE

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