[CAUT] a new tuning pin

[Marcel Carey]

Stephen,

if the patent has expired and you have a sample, could you describe
what is so new about these pins.

Marcel Carey, RPT
Sherbrooke, QC

> -----Original Message-----
> From: caut-bounces@ptg.org [mailto:caut-bounces@ptg.org]On Behalf Of
> Stephen Birkett
> Sent: September 5, 2005 1:48 AM
> To: College and University Technicians
> Subject: Re: [CAUT] a new tuning pin
>
>
> >Anyone know if what, if anything, ever became of his idea?
>
> US patent  4,920,847 was granted to Harold in 1990. These pins were
> never put into production, and with the demise of Baldwin
> the patent
> eventually lapsed.
>
> I have some samples that Harold sent me and have tested
> them, as well
> as the general principles using hardware we put together in
> the lab.
> The idea is excellent, although sensitive to having exactly
> the right
> parameters and lubricant type (see Harold's patent testing)
> for long
> term torque stability, albeit with hundreds of repeated back and
> forth cycles (which a pin would not be subjected to in a piano
> application).
>
> I may use this type of pin in the new piano we're designing at UW.
>
> Stephen
> --
> Dr Stephen Birkett
> Piano Design Lab
> Department of Systems Design Engineering
> University of Waterloo, Waterloo ON Canada N2L 3G1
> tel: 519-888-4567 Ext. 3792
> Lab room E3-3160 Ext. 7115
> mailto: sbirkett[at]real.uwaterloo.ca
> http://real.uwaterloo.ca/~sbirkett
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