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US 6,641,466 B2Granted
Apparatus for securing and clamping optical lenses requiring edge-machining, in particular spectacle lenses
AssigneeOptikmaschinen AG
InventorsSteffen Wallendorf, Holger Schäfer
Life of this patent
Estimating the term…
Abstract
An apparatus is provided for securing and clamping optical lenses requiring edge-machining, in particular spectacle lenses, which exhibits improved handling and which is optimised from the point of view of virtually backlash-free rotary drive of the optical lens. Elements located between two holding shafts, in particular a clamping assembly, a securing member with securing member adapter and an adhesive connection between securing member and optical lens are specially designed for this purpose.
Claims34
An apparatus for securing and clamping optical lenses requiring edge-machining, between first and second rotatable holding shafts, having
- a securing member, which may be attached detachably to one side of the optical lens,
- an adapter for the securing member, which may be connected rigidly to said first holding shaft and is constructed for rotation angle-oriented rotary drive of the securing member, and
- a clamping assembly, which comprises a fastening portion connectable rigidly to said second holding shaft and a clamping portion connected to the fastening portion, which clamping portion is constructed for force-locking engagement with a second side of the optical lens,
- wherein the clamping assembly has a spherical head with opposing sides and an axis of rotation, which spherical head is provided on each of its opposing sides with a projection having an end zone, and which spherical head is accommodated in a receiving portion with opposing sides and an axis of rotation, which receiving portion is provided on its opposing sides with channels extending parallel to the axis of rotation of the receiving portion, which channels each have a channel bottom and serve for substantially rotary play-free guidance of the projections, for which the channel bottom of each of the channels displays, in cross section, a shape complementary to the end zone of the associated projection, wherein the clamping portion may be swivelled relative to the fastening portion about a first tilt axis perpendicular to the axis of rotation of the spherical head and extending through the projections, and about a second tilt axis perpendicular to the axis of rotation of the spherical head and to the first tilt axis, while torque may be transmitted via the projections from the fastening portion to the clamping portion.
1 more element
An apparatus for securing and clamping optical lenses requiring edge-machining, between first and second rotatable holding shafts, having
- a securing member, which may be attached detachably to one side of the optical lens,
- an adapter for the securing member, which may be connected rigidly to said first holding shaft and is constructed for rotation angle-oriented rotary drive of the securing member, and
- a clamping assembly, which comprises a fastening portion connectable rigidly to said second holding shaft and a clamping portion connected to the fastening portion, which clamping portion is constructed for force-locking engagement with a second other side of the optical lens, and
- wherein the securing member and the securing member adapter each comprise rotary drive elements for form-fitting rotary drive of the securing member by the securing member adapter, and positioning elements for orientation with regard to angle of rotation of the securing member relative to the securing member adapter,
- wherein the positioning elements on the securing member optionally on the securing member adapter take the form of a plurality of asymmetrically arranged projections with end faces, the end faces of which asymmetrically arranged projections lie in a common plane perpendicular to the axis of rotation, while the positioning elements on the securing member adapter optionally on the securing member take the form of recesses associated in complementary manner with the asymmetrically arranged projections, said recesses starting from a flat surface perpendicular to the axis of rotation, and
- wherein the axial distance between the rotary drive elements and the positioning elements on the securing member is different from an axial distance between the rotary drive elements and the positioning elements on the securing member adapter, such that, if the securing member is moved axially towards the securing member adapter and rotation angle orientation has not yet been achieved, first of all the projections come to rest against the flat surface and then, once rotation angle orientation is complete, the projections enter into the recesses, whereupon the rotary drive elements come into engagement with one another.
3 more elements
Dependencies are inferred from the claim text.