F - Mech Eng,Light,Heat,Weapons – 16 – D
Patent
F - Mech Eng,Light,Heat,Weapons
16
D
51/17, 310/34
F16D 3/12 (2006.01) B23Q 1/70 (2006.01) B23Q 5/10 (2006.01) B24B 47/12 (2006.01) G02C 7/04 (2006.01) H02K 7/10 (2006.01) H02K 49/10 (2006.01)
Patent
CA 1176678
ABSTRACT OF THE DISCLOSURE The invention seeks to avoid vibration and damage to workpieces in machines for turning and polishing contact lenses. A drawback experienced with known machines for this purpose is that vibration created by a prime mover, e.g. an electric motor, is transmitted to a driven rotatable support for a lens. This is detrimental to the surface finish imparted to the lens by a tool also if excess pressure is applied to the workpiece then damage can occur due to the in- creased torque. In this invention the drive is transmitted from the prime mover to the lens support by a permanent magnetic coupling which avoids physical con- tact between the lens support and said prime mover and has the property of stopp- ing transmitted drive when excess torque above the magnetic breaking valve is applied.
384636
Chase Diamond Tools Ltd.
Fetherstonhaugh & Co.
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