Patent ID: 6855042

Claim:
A retaining device for a block or suction element ( 10 ) in a centering device for spectacle lenses, having a support ( 1 ), which has a longitudinal axis ( 2 ), a spherically dome-shaped bearing surface ( 3 ) on the support ( 1 ), a spherical dome ( 5 ), which is mounted on the support ( 1 ) and is complementary to the bearing surface ( 3 ), a holding element ( 6 ) in the spherical dome ( 5 ) for the block or suction element ( 10 ) with a contact surface ( 11 ) for an unprocessed lens ( 12 ), and a radius (R) of the bearing surface ( 3 ) and of the spherical dome ( 5 ), the mid-point (M) of which is located on the longitudinal axis ( 2 ) of the support ( 1 ), on the contact surface ( 11 ) for the unprocessed lens ( 12 ), characterized by cardanic mounting of the spherical dome ( 3 ) on the support ( 1 ) by means of a first slotted guide ( 4 ) for a sliding block ( 13 ), said guide extending perpendicularly to the longitudinal axis ( 2 ) in the support ( 1 ), and by means of a further, second slotted guide ( 14 ) in the spherical dome ( 5 ) for a second sliding block ( 15 ), said guide extending perpendicularly to the first slotted guide ( 4 ), the sliding blocks ( 13 , 15 ) forming a nonrotatable connection between the spherical dome ( 5 ) and the support ( 1 ).