- Piano string as a spring mechanism. Or why do some pianos and grand pianos have a double loop ( double-eye) on the iron plate pin 'the hitch' as well?
To attach the string to the tuning piano pin, there is a special additional mechanism in the form of 3 turn or more there , which tightly wrap the tuning pin there. This ensures uniform pressure of the string coils on the pin there. That is, in fact, 3-5 of the string's coils press on a larger radial area of the pin there. When successively moving the tuning pin in the pinblock hole under the tension of the string, the end of the string (coils) is essentially the spring there. Therefore, this partially increases the tuner's ability to more gently move the tuning pin in the pinblock hole of the piano. That is, the 'spring mechanism' (coils) 'help' it's whole end minimizes the movement of the handle wrench of the hammer when rotating the pin and, accordingly, it is possible and necessary not to bend off and shake the pin when moving it there. Thus, thanks to (coils) we can partially preserve not only the resource part of the wooden hole of the piano pinblock there, but also minimize the movement of the string in the area of the (NLS) as well, and thus partially reduce the friction of the string everywhere. That is, (coils) allows you to preserve the resource part of the pinblock hole and not expose the string to destructive processes there.
But there is also a negative side, I'm think so it. When we install the 'coils' of the string, we expose this end of the string to additional deformations. If the metal alloy from which the string is made has a high-quality composition that can provide minor elastic deformation for many years of operation, then this will work well, but if the metal is of poor quality, then in the zone of PLASTIC deformation (coils) it will probably manifest itself in a break in the string there.
If we assume that I am right and (coil) has an advantage over simply installing the end of the string in the tuning pin hole there, then the question arises: 'Why is such (coils) not installed everywhere on all upright pianos and the grand pianos, except for old German upright and grand pianos, on the back side of the string ('the hitch') in the area of the pin iron plate there? 3-5 coils could also minimize the negative processes for the lower part of the string, in my understanding of the subject.
And what do active working piano tuners think it's about?
Please write yours thoughts on this.
regards, Max