Hammer assist spring ?

[Stéphane Collin]

True Del, but in the Herrburger-Schwander inverted center linked action, at hammer-string contact time, the effect of the spring is null.  And also, in this pattent, it is quite easy to even out the BW at 1g near.

Stéphane Collin.


----- Original Message ----- 
From: "Delwin D Fandrich" <pianobuilders@olynet.com>
To: "Pianotech" <pianotech@ptg.org>
Sent: Saturday, June 07, 2003 4:21 PM
Subject: Re: Hammer assist spring ?


| 
| ----- Original Message -----
| From: "Ron Overs" <sec@overspianos.com.au>
| To: "Pianotech" <pianotech@ptg.org>
| Sent: June 06, 2003 9:41 PM
| Subject: Re: Hammer assist spring ?
| 
| 
| > >Why not a hammer assist spring instead of whippen assist spring ?
| > >Conceptually, you could essentially effect the same SW seen from the
| > >lower actions perspective for the whole action... which would allow for
| > >identical key balancing for the entire action.
| > >
| >
| > The first and most compelling reason for not fitting an assist spring
| > to the hammer is that the hammer travels through a much larger arc of
| > rotation than the wippen, which would cause any assistance given to
| > reduce more dramatically as the hammer rotates around its centre.
| 
| 
| Not to mention the fact that you really want the hammer/hammershank
| assembly to bounce away from the string fairly rapidly. You don't want some
| spring holding the thing up there.
| 
| Del
| 
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