Tone arm assembly

Claim 2

A tone arm assembly for a phonograph apparatus, including a tone arm base means; a tone arm extension means mounted on the base means for movement relative thereto and adapted to carry a stylus, and locator means constructed to permit limited relative movement between the base means and the extension means when the stylus is engaged with a phonograph record disk, said locator means including a pin carried by one of said base means and said extension means, means defining a surface forming an opening in the other of said base means and said extension means, said pin extending into said opening and having an end portion and a base portion enlarged relative to the end portion, said opening being larger in cross section than said end portion, said surface forming said opening being adapted to engage said base portion in mating relationship.

Claim 3

A tone arm assembly for a phonograph apparatus, including a tone arm base means; a tone arm extension means adapted to carry a stylus and mounted on the base meAns for lateral movement relative thereto and for movement transverse to said lateral movement between two positions relative to the base means, one of said positions corresponding to the position of said extension means relative to the base means when the tone arm assembly is mounted in a phonograph apparatus and the stylus is in engagement with a phonograph record disk, the other of said positions corresponding to the position of said extension means relative to the base means when the tone arm assembly is mounted in a phonograph apparatus and the stylus is out of engagement with a phonograph record disk; and locator means on said base means and said extension means constructed to limit said relative lateral movement of said extension means when said extension means is in said one position and to prevent said relative lateral movement of said extension means when said extension means is in said other position, said locator means including a pin carried by one of said base means and said extension means, and a surface defining an opening in the other of said base means and said extension means, said pin extending into said opening and having an end portion and a base portion enlarged relative to the end portion, said opening being larger in cross section than said end portion, said surface forming said opening being adapted to engage said base portion in mating relationship.

Claim 4

A tone arm assembly for a phonograph apparatus, including a tone arm base means; a tone arm extension means adapted to carry a stylus and mounted on the base meAns for lateral movement relative thereto and for movement transverse to said lateral movement between two positions relative to the base means, one of said positions corresponding to the position of said extension means relative to the base means when the tone arm assembly is mounted in a phonograph apparatus and the stylus is in engagement with a phonograph record disk, the other of said positions corresponding to the position of said extension means relative to the base means when the tone arm assembly is mounted in a phonograph apparatus and the stylus is out of engagement with a phonograph record disk; and locator means on said base means and said extension means constructed to limit said relative lateral movement of said extension means when said extension means is in said one position and to prevent said relative lateral movement of said extension means when said extension means is in said other position, said locator means including a pin carried by one of said base means and said extension means, and a surface defining an opening in the other of said base means and said extension means, said pin extending into said opening and having an end portion and a base portion enlarged relative to the end portion, said opening being larger in cross section than said end portion, said surface forming said opening being adapted to engage said base portion in mating relationship.

Claim 5

A tone arm assembly according to claim 2, wherein said locator means comprises an opening in said extension means, and a pin mounted on said base means and extending into said opening, said pin having a frustoconical base portion and a cylindrical end portion joined to said base portion, said opening having a diameter larger than the diameter of said pin end portion and being defined by a frustoconical surface on said extension means adapted to mate with said pin base portion when said extension means is in said other position, said pin base portion and said frustoconical surface comprising camming surfaces adapted to locate said extension means in said central position during movement of said extension means from said one position to said other position.

Claim 6

A tone arm assembly adapted to carry a stylus and including a tone arm base means adapted to be mounted in a phonograph apparatus for pivotal movement relative to a turntable in a horizontal plane and for movement in a vertical plane between a lower position in which the stylus is in engagement with a phonograph record disk resting on the turntable and an upper position in which the stylus is out of engagement with the phonograph record disk, a tone arm extension means carried by the base means and having an outer end and an inner end, said extension means having stylus mounting means at said outer end thereof, pivot means at said inner end of said extension means interconnecting said base means and said extension means for movement of said extension means relative to said base means in a horizontal plane, said pivot means being formed to permit limited relative movement of said extension means relative to said base means in a vertical plane between a first position corresponding to said upper position and a second position corresponding to said lower position, and locator means comprising an opening in said extension means intermediate said ends thereof, and a pin mounted on said base means and extending into said opening, said pin having a frustoconical base portion and a cylindrical upper portion joined to said base portion, said opening having a diameter greater than the diameter of the upper pin portion and being defined by a frustoconical surface on said extension means, said surface being adapted to surround said upper pin portion when said extension means is in said second position whereby to limit movement of said extension means relative to said base means in a horizontal plane, said surface being adapted to mate with said pin base portion when said extension means is in said first position whereby to prevent movement of said extension mEans relative to said base means in a horizontal plane, said pin base portion and said surface comprising cam surfaces adapted to locate the extension means in a predetermined position in a horizontal plane relative to the base means during movement of said extension means from said second position to said first position.

Claim 7

A tone arm assembly adapted to carry a stylus and including a tone arm base means adapted to be mounted in a phonograph apparatus for pivotal movement relative to a turntable in a horizontal plane and for movement in a vertical plane between a lower position in which the stylus is in engagement with a phonograph record disk resting on the turntable and an upper position in which the stylus is out of engagement with the phonograph record disk, a tone arm extension means carried by the base means and having an outer end and an inner end, said extension means having stylus mounting means at said outer end thereof, pivot means at said inner end of said extension means interconnecting said base means and said extension means for movement of said extension means relative to said base means in a horizontal plane, said pivot means being formed to permit limited relative movement of said extension means relative to said base means in a vertical plane between a first position corresponding to said upper position and a second position corresponding to said lower position, and locator means comprising an opening in said extension means intermediate said ends thereof, and a pin mounted on said base means and extending into said opening, said pin having a frustoconical base portion and a cylindrical upper portion joined to said base portion, said opening having a diameter greater than the diameter of the upper pin portion and being defined by a frustoconical surface on said extension means, said surface being adapted to surround said upper pin portion when said extension means is in said second position whereby to limit movement of said extension means relative to said base means in a horizontal plane, said surface being adapted to mate with said pin base portion when said extension means is in said first position whereby to prevent movement of said extension mEans relative to said base means in a horizontal plane, said pin base portion and said surface comprising cam surfaces adapted to locate the extension means in a predetermined position in a horizontal plane relative to the base means during movement of said extension means from said second position to said first position.