Braking arrangement for a gear wheel
AssigneeETA SA Fabriques d'Ebauches
InventorCyril Vuilleumier
Life of this patent
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Abstract
This invention concerns a braking arrangement for a gear wheel. The purpose of the invention is to brake the last wheel in a gear train in order to avoid the latter rotating through unequal angular steps. Such purpose is achieved with the help of an element forming a brake (1) fixed onto a first wheel set (2) of a gear train in a manner to be driven in rotation by the latter, such element (1) exhibiting a friction surface (39) at its periphery brought to bear elastically onto a second wheel set (6) meshing with the first so as to brake such second wheel set (6). The invention is more especially applied to horological and chronograph gearing.
Claims15
In a braking arrangement for a gear wheel in a gear train comprising at least first and second wheel sets, said first wheel set comprising a first shaft having an axis and a toothed wheel pivoting around said first shaft and meshing with said second wheel set, said second wheel set comprising a second shaft having an axis parallel to the first shaft and a second toothed wheel having a face and pivoting around said second shaft, the improvement comprising an elastic element forming a brake mounted coaxial to said first shaft, such brake forming element being associated with said first wheel set in a manner to be driven in rotation thereby, said elastic element having proximate its periphery a friction surface, the axial position of said brake forming element relative to said first shaft being chosen relative to the axial position of the second toothed wheel in a manner such that said friction surface bears elastically against said face of said second toothed wheel so as to brake said second toothed wheel.
A timepiece comprising first and second toothed wheels and a hand mounted to said second toothed wheel for rotation therewith, said first toothed wheel meshing with and driving said second toothed wheel, and a braking arrangement including an elastic element forming a brake mounted coaxially with said first toothed wheel for rotation therewith and said elastic element having a periphery and a friction surface proximate said periphery, said friction surface bearing elastically against one of the faces of said second toothed wheel so as to brake said second toothed wheel.
Dependencies are inferred from the claim text.