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US 4,198,056 AGranted
Protective device for record player
OwnerTristan P. Cooperinventor
Life of this patent
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OwnerTristan P. Cooperinventor
Estimating the term…
A protective device for pivotable attachment to the cartridge or pickup arm of a record player so that, when lowered onto a moving record disc, the record will pivot the device from a guard position in which it hangs below the stylus to a playing position in which it is clear of the stylus. The device may comprise a contact brush which projects downward in the guard position, a cleaning brush which trails behind the stylus in the playing position, and a wiping brush which wipes the stylus when the pickup arm is raised from the record. The brushes may be conductive, and may be of carbon fibers, with arrangements for electrical connection to earth or ground through mounting means on the cartridge or pickup arm. Various means for acoustic damping are described. A method of making a brush assembly for the device is described, utilizing ultrasonic welding of pieces of plastics material to form a body.
A protective device for a record player with a pickup arm having a phonograph cartridge with a stylus which projects downwards when in use to contact the groove of a record beneath it, said device comprising a pivotable member having a protective member and means for pivotably attaching said pivotable member to the cartridge or the pickup arm in such a manner that, when the pickup arm is lowered to place the stylus on the moving record, said pivotable member engages said record to pivot the same from a guard position wherein said protective member hangs below the stylus to a playing position wherein said protective member is clear of the stylus,
A protective device for a record player with a pickup arm having a phonograph cartridge with a stylus which projects downward when in use to contact the groove of the record beneath it, the device comprising an electrically conductive pivotable member having a protective member and means for pivotably attaching said pivotable member to the cartridge or the pickup arm in such manner that, when the pickup arm is lowered to place the stylus on the moving record, the pivotable member will engage the moving record and be pivoted from a guard position in which said protective element lies below the stylus to a playing position in which said element is clear of the stylus, said pivotable member including a plurality of carbon fibre brushes comprising a first conductive brush extending from said protective element and electrically coupled thereto for engaging said record upon lowering of said pickup arm and pivoting said pivotable member to said playing position as a result of movement of the record, a second conductive brushextending from said protective element and electrically coupled thereto and contacting said record in said playing position to provide an electrical connection between said record and the cartridge or pickup arm while simultaneously cleaning the grooves of said record, and a third brush which projects toward said stylus when said pivotable member is in the guard position and is operative to remove dust and fluff from the stylus when the pivotable member pivots between the guard and playing position.
Dependencies are inferred from the claim text.