Pickup cartridge of moving coil type for phonograph

A pickup cartridge of moving coil type for phonograph comprising a cartridge body, and a stylus assembly detachably mounted on the body, the body including a housing, a permanent magnet secured within the housing, a pair of pole pieces connected with the permanent magnet and supported within the housing with one end of one of the pole pieces defining together with one end of the other pole piece a magnetic gap which opens into the lower surface of the housing, and a plurality of electrical terminal pins secured to the housing with their one end projecting externally through a side of the housing and their other end projecting externally through the lower surface of the housing, the stylus assembly including a knob member having a columnar portion, a plurality of electrical connectors secured to the knob member for detachable engagement with the other end of the terminal pins, a stylus subassembly supported by the knob member and comprising a cantilever arm carrying a stylus tip on its one end and an armature supported by the other end of the arm and carrying a pair of coils thereon, said cartridge body having a socket to receive the columnar portion with frictional engagement, detent means cooperating with said columnar portion to interlock said columnar portion in said socket, said columnar portion projecting perpendicular to the axis of the cantilever arm, and means for connecting the end of the coils with the connectors, the other end of the terminal pins and the connectors being aligned in a plane which is perpendicular to the axis of the cantilever arm with the magnetic gaps disposed in a plane perpendicular to the axis of the cantilever arm so that when the terminal pins are engaged with the connectors, the coils are disposed in the magnetic gaps.

A pick up cartridge of the moving coil type for a phonograph comprising:

• a cartridge housing for mounting on a tone arm;
• a separable and replaceable stylus assembly, having a body;
• electrical connector means on each of said cartridge housing and said stylus assembly body for mechanical interlocking to assist in securing said body to said cartridge housing and to provide electrical interconnections therebetween;
• a cantilever arm projecting downwardly and forwardly from said stylus body;
• a stylus tip on an outer free end of said cantilever arm;
• armature means including a pair of rods of magnetic material projecting upwardly from said cantilever with the axes of the rods lying in a plane perpendicular to the axis of the cantilever arm and each forming an angle of 45 degree with respect of an imaginary vertical plane through the axis of the cantilever arm;
• a coil on each of said rods;
• lead means connecting said coils to said electrical connector means;
• said stylus body defining an opening about said rods and said coils thereon;
• and
• a permanent magnet and pole pieces located adjacent and in close proximity to said coils and said rods and defining magnetic gaps;
• said electrical connector means comprising a plurality of parallel pins and a plurality of receiving connectors having frictional engagement with said pins.
• said cartridge including:
• a post projecting upwardly from the cantilever arm and being perpendicular to axis through the cantilever arm, and a socket means for receiving said postopening downwardly and in direction perpendicular to the axis of the cantilever arm, said post and socket means having frictional engagement and positioning rods carrying the coils with the axes of the rods at an angle of 45 degree with respect to the imaginary vertical plane Which includes the axis of the cantilever and at a vertically disposed position relative to the permanent magnet and the magnetic gaps.