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US 4,358,270 AGranted
Dental instrument retraction activator
AssigneeSybron Corporation
InventorManfred Schmidt
Life of this patent
Estimating the term…
Abstract
One or more dental instruments are connected by flexible supply lines to a dental unit. A retractor is arranged to pull an extended instrument back to the unit upon being triggered. The dental instrument carries a magnet. A magnetic sensor is located near the retractor. When the instrument is passed near to sensor a signal activates the retractor which pulls in the instrument.
Claims1
A dental instrument retraction activator comprised of:
- at least one dental instrument characterized by having a magnetic field;
- a retraction mechanism which is activated by an electrical signal;
- a supply line attached to the dental instrument and running to the retraction mechanism;
- a magnetic sensor is arranged in proximity to the retraction mechanism which generates an electrical signal in response to a moving magnetic field if the dental instrument is passed by the sensor;
- a low pass filter and an amplitude selective circuit in series with said sensor for providing a low noise amplitude electric signal;
- and
- means for providing a retractor activating electrical signal in response to the amplified electric signal.
4 more elements
Dependencies are inferred from the claim text.