US Patent 7648391 Shaft lock socket system

A shaft lock socket system comprises: a housing defining a receiving chamber; at least a socket received in the receiving chamber, installed with a gap between the back of the socket and the inward portion of the receiving chamber; and at least an adjusting member arranged in the gap between the socket and the receiving chamber and abutting against the back of the socket. The system allows for adjustment of the tightness between the socket and the housing to a proper level, reducing resonance vibration in response to tiny vibrations caused by current passing through the plug and socket, thus improving the stability of power transmission and the sound quality of an audio device.