Phonograph with novel tone arm and pickup cartridge assembly

Claim 1

AN ASSEMBLY ADAPTED TO BE MOUNTED ON THE TONE ARM OF A PHONOGRAPH FOR REPRODUCING GROOVED RECORDS COMPRISING A CARRIAGE AND A PICKUP CARTRIDGE MOUNTED ON THE CARRIAGE HAVIG A STYLUS ADAPTED TO FOLLOW A RECORD GROOVE EXTENDING FROM THE CARTRIDGE, SAID CARRIAGE INCLUDING A BRACKET ADAPTED TO BE MOUNTED IN A FIXED POSITION ON THE PHONOGRAPH TONE ARM, AN ELONGATED PLATE MOUNTED ON THE BRACKET FOR PIVOTAL MOVEMENT RELATIVE TO THE BRACKET ABOUT AN AXIS DISPOSED IN A PLANE PARALLEL TO THE PLANE OF THE RECORD GROOVE WHEN THE TONE ARM IS IN PLAYING POSITION, THE AXIS OF ELONGATION OF THE PLATE BEING DISPOSED NORMAL TO THE PIVOTAL AXIS, THE CARTRIDGE BEING MOUNTED ON THE SIDE OF THE PLATE ADAPTED TO CONFRONT THE RECORD AND ON ONE SIDE OF THE PIVOTAL AXIS WITH THE STYLUS DISPOSED IN A PLANE NORMAL TO THE PIVOTAL AXIS AND DEPENDING FROM THE CARTRIDGE FOR ENGAGING A RECORD, STOP MEANS OPERATIVELY ASSOCIATED WITH THE CARRIAGE AND THE BRACKET FOR LIMITING PIVOTAL MOVEMENT OF THE PLATE BETWEEN TWO LIMITS, THE SECOND LIMIT POSITIONING THE CARTRIDGE CLOSER TO THE CARRIAGE THAN THE FIRST LIMIT, MEANS OPERATIVE BETWEEN THE BRACKET AND THE PLANE FOR ESTABLISHING A TORQUE ABOUT THE PIVOTAL AXIS IN A DIRECTION TOWARD THE FIRST LIMIT, SAID TORQUE EXERTING A FORCE COMPONENT ON THE STYLUS VARYING FROM A VALUE LESS THAN THE TRACKING FORCE OF THE CARTRIDGE WHEN THE PLATE IS DISPOSED IN THE POSITION OF THE FIRST LIMIT TO A VALUE GREATER THAN THE TRACKING FORCE OF THE CARTRIDGE WHEN THE PLATE IS DISPOSED IN THE POSITION OF THE SECOND LIMIT, A PAD MOUNTED ON THE CARTRIDGE BETWEEN THE STYLUS AND THE PIVOTAL AXIS AND EXTENDING TO THE SIDE OF A PLANE PASSING THROUGH THE PIVOTAL AXIS AND THE TIP OF THE STYLUS OPPOSITE FROM THE PLATE, SAID PAD BEING ADAPTED TO ENGAGE THE SURFACE OF A RECORD WHEN THE PLATE OF THE CARRIAGE IS DISPOSED IN THE POSITION OF THE SECOND LIMIT AND THE STYLUS BEING ADAPTED TO EENGAGE THE SURFACE OF THE RECORD WHEN THE PLATE IS DISPOSED IN THE POSITION OF THE FIRST LIMIT, SAID STYLUS ALSO BEING ADAPTED TO ENGAGE THE SURFACE OF THE RECORD WHEN THE PLATE IS DISPOSED BETWEEN THE FIRST AND SECOND LIMITS AND THE TORQUE EXERTED ON THE PLATE EXERTS A FORCE COMPONENT ON THE STYLUS APPROXIMATELY EQUAL TO THE TRACKING FORCE OF THE CARTRIDGE.