Shockproof centre wheel
AssigneeETA SA Manufacture Horlogere Suisse
InventorsPascal Lagorgette, Raphael Balmer
Life of this patent
Estimating the term…
Abstract
Shockproof timepiece wheel for driving a component having unbalance relative to a pivot axis of this wheel, The wheel includes, on the one hand, an arbour for pivotally guiding the wheel about this pivot axis, and on the other hand, a drive device arranged or assembled on a flange of this wheel, the wheel including at least one flexible element between this arbour and the flange. The flange includes a cylindrical shoulder, which cooperates in abutment for centring purposes with a complementary cylindrical shoulder provided in the arbour to ensure the perfect concentricity of the drive device with the arbour.
Claims27
A shockproof timepiece wheel for driving a component having unbalance relative to a pivot axis of said wheel, said wheel includes, on the one hand, an arbour for pivotally guiding the wheel about said pivot axis, and on the other hand, a drive means arranged or assembled on a flange of said wheel, said wheel including at least one flexible element between said arbour and said flange, wherein said flange includes a cylindrical shoulder cooperating in abutment for centring purposes with a complementary cylindrical shoulder comprised in said arbour to ensure the perfect concentricity of said drive means with said arbour, and wherein said flexible element is either confined between said flange and a locking washer held on said arbour or snapped onto said flange and/or said arbour, and wherein said flexible element includes bosses arranged, in normal operation, to transmit a drive torque between said arbour and said flange, and, in the event of any shock, to absorb the torsion between said arbour and said flange, to dissipate part of the energy from said shock by friction to modify the effect on said drive means of the amplitude and the duration of said shock by reducing the amplitude and increasing the duration thereof, and to form an elastic return means returning said flange to a position of realignment relative to said arbour after said shock.
A shockproof timepiece wheel for driving a component having unbalance relative to a pivot axis of said wheel, said wheel includes, on the one hand, an arbour for pivotally guiding the wheel about said pivot axis, and on the other hand, a drive means arranged or assembled on a flange of said wheel, said wheel including at least one flexible element between said arbour and said flange, wherein said flange includes a cylindrical shoulder cooperating in abutment for centring purposes with a complementary cylindrical shoulder comprised in said arbour to ensure the perfect concentricity of said drive means with said arbour, and wherein said flexible element is a substantially omega-shaped wire spring, held on the one hand in a front groove of said arbour, and on the other hand in a chamber of said flange, in which said spring is held substantially coplanar to said flange.
A shockproof timepiece wheel for driving a component having unbalance relative to a pivot axis of said wheel, said wheel includes, on the one hand, an arbour for pivotally guiding the wheel about said pivot axis, and on the other hand, a drive means arranged or assembled on a flange of said wheel, said wheel including at least one flexible element between said arbour and said flange, wherein said flange includes a cylindrical shoulder cooperating in abutment for centring purposes with a complementary cylindrical shoulder comprised in said arbour to ensure the perfect concentricity of said drive means with said arbour, and wherein said flexible element is integrated in said flange and includes two substantially radial and recessed strip springs in the thickness thereof, which cooperate in abutment by friction with an off-centre hollow cylindrical sector of said arbour.
A shockproof timepiece wheel for driving a component having unbalance relative to a pivot axis of said wheel, said wheel includes, on the one hand, an arbour for pivotally guiding the wheel about said pivot axis, and on the other hand, a drive means arranged or assembled on a flange of said wheel, said wheel including at least one flexible element between said arbour and said flange, wherein said flange includes a cylindrical shoulder cooperating in abutment for centring purposes with a complementary cylindrical shoulder comprised in said arbour to ensure the perfect concentricity of said drive means with said arbour, and wherein said flexible element is formed by an elastomer overmould holding said flange and said arbour together.
Dependencies are inferred from the claim text.