Turntable speed lock system
CA 1069211 A · Owner: Rca Corporation · Inventors: Hammond, Robert J.; Miller, Carl W.; Culver, Larry F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure A turntable speed lock system is provided to supplement an inexpensive main motor which drives the turntable through a pulley-belt arrangement and which, main drive arrangement fails to maintain the turntable rotation at a predetermined speed within specified tolerance limits desired for proper operation. A rotor ring having, a plurality of permanently magnetized poles of alternate polarity along its periphery, is mounted concentrically on the turntable for rotation therewith. A stator assembly including a core with an airgap, for receiving the rotatable rotor ring, is fixedly mounted on a turntable mounting plate. The stator assembly further includes a field …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted January 1, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 1, 1997.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.