Device for transferring the vibrations of strings to the walls of a hollow body

US5044246A · kind A · utility

Inventor

• Karlwalter Schmidt · Waiblingen, DE

Key dates

• Filing date: Aug 17, 1989
• Grant date: Sep 3, 1991
• Expiry date: Aug 17, 2009

Classification

• Technology area (CPC G): Physics
• CPC primary: G10D3/04
• WIPO field: Other consumer goods
• WIPO sector: Other fields

Abstract

The invention relates to a device for the transfer of string vibrations to the outer walls of a hollow body. The strings are stretched over a bridge in the conventional manner and the bridge transfers the movements to a mobile wall of the hollow body. This narrow wall with a relatively small surface does not mainly vibrate the surrounding air and instead transfers via supports the string vibrations to two large-area hollow body walls positioned below it. The bearing points of the bridge on the hollow body narrow wall, the hollow body walls and the supports are arranged in such a way that in the case of a bridge vibrating movement direction following the string vibrations, the large surfaces of the hollow body are moved in opposite directions. The large surfaces mainly vibrate the surrounding air, on the one hand directly through the movements thereof on the hollow body surface and on the other hand indirectly by the pumping action of the oppositely moving large surfaces on the air within the hollow body, which in turn excite the ambient air by corresponding wall openings. The transfer mechanism permits larger vibrating walls with larger vibration amplitudes and a larger hollow body…