Phonograph cartridge replaceable stylus assembly
US4140321A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 4, 1978 |
| Grant date | Feb 20, 1979 |
| Priority date | — |
| Expiry date | Apr 4, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/18
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A phonograph cartridge replaceable stylus assembly is provided. The assembly comprises a housing having a nonmagnetic tube affixed thereto. The tube has a forward end and a rear end extending outwardly away from the housing. A nonmagnetic stylus arm extends through the tube forward end. A jeweled stylus is mounted to the front of the arm. The rear end of the arm passes through an elastomeric damper positioned within the tube. The damper serves as a universal pivot joint for the arm. The damper comprises a cylindrical member having a forward edge and a rear edge. The tube is crimped along a circular crimp line engaging the damper intermediate the forward and rear edges with the portions of the damper that do not engage the crimp also being free of the tube. A magnetic member is positioned within the tube secured to the arm and adapted to move therewith in response to motion of the jeweled stylus and following the grooves of a record. The arm passes through and extends beyond the magnetic member terminating within the elastomeric damper in front of the crimp. A tension-free tie wire extends rearwardly from the rear of the arm and is secured to the tube. The tie wire serves to restore…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.