Mutual mounting of a crystal, a dial and a casing ring for a timepiece
AssigneeETA SA Fabriques d'Ebauches
InventorPhilippe Stauffer
Life of this patent
Estimating the term…
Abstract
In order to angularly position and centre the crystal (5) with respect to the dial (4), the dial is provided with at least one lug (8) capable of being introduced precisely into a hollow (11) made in a collar (10) of the crystal (5). Thus, if the crystal has a lens (41) and the dial (4) has a window (40), the lens will be superposed exactly on said window.
Claims3
A timepiece including a movement mounted in a casing ring, a dial mounted above the ring, a crystal mounted above the dial and means for securing the crystal onto a case, wherein the dial includes at least one lug projecting from its flank and wherein the crystal is provided with an annular shoulder resting on the dial and a collar surrounding the flank of said dial, said collar being provided with at least one hollow arranged so as to cap said lug in order to position angularly and to centre the crystal with respect to the dial.
Dependencies are inferred from the claim text.