Patent ID: 7320516
Filing Date: 2008-01-22
Classification: B28D,Y10T

Abstract:
1. Apparatus for use in determining the position of and forming of assembling holes in spectacle lens for rimless spectacles, the assembling holes intended for mounting a bridge and a side bar hinge, including a holder for the lens and machining means that are movable, in two dimensions, relative to the holder, wherein the holder includes a fixture having an opening for fixing the lens at its circumferential rim and at least two first guide means that interact with two corresponding second guide means on an apparatus frame, wherein the first guide means are disposed unambiguously, symmetrically, in relation to a hole centre line for the lens when the latter is placed in the fixation opening that it further includes an elastic ring for placing in a fixation opening at a position between the lens and the apparatus frame for fixing the position of the lens in direction perpendicularly to the plane of the fixation opening, as the lens is pressed down against the ring which thereby is brought into contact against the frame on which the fixture is placed and it includes a packing to be placed between the circumferential edge of the lens and the fixation opening which is formed oversized in relation to the lens.