[QuadList] Headwheel Refurbishing and Inventions

[Don Norwood]

I've changed the subject title since this no longer relates specifically to RCA headwheels.

After posting the Spin Physics pictures, I noticed the patent number on the label and looked it up.  This particular patent concerns the method of manufacturing the ferrite heads, but a cross index shows that Spin Physics received 29 patents, mostly related to magnetic heads, but also including drop-out compensation, use of field stores for synchronizing non-synchoronus signals, a capstanless transport, and among other things, an apparatus for controlling exposure of a solid state image sensor array.

But most interesting is patent # 4040110 which applies specifically to quad headwheels and involves the addition of ceramic surfaces to both the headwheel and the vacuum guide in order to extend their life and take advantage of an anticipated 1500 hour head life.  The patent was granted in Aug of '77.  Does anyone know if such a product with the ceramic material was ever offered?

Don Norwood
Digitrak Communications, Inc.
www.digitrakcom.com
  ----- Original Message ----- 
  From: Don Norwood 





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  Hi Dale:

  I have a Spin refurbished MK-10 in use at the moment.  The association with Kodak is shown on the label.  They did use ferrite heads, and they supplied a special set of instructions regarding how to safely measure tip projection.  Here are a couple of pics of the head.......

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