Phonograph pick-up arm

Claim 1

AN IMPROVED PHONOGRAPH PICK-UP ARM ASSEMBLY COMPRISING: AN ELONGATED, STRAIGHT, RELATIVELY RIGID ARM WITH A HEAD FOR SUPPORTING A PICK-UP CARTRIDGE ADJACENT ONE END; A COUNTERWEIGHT MOUNTED ON SAID ARM ADJACENT THE OTHER END FOR NON-ROTATIONAL SLIDE MOVEMENT LONGITUDINALLY OF THE ARM FOR ADJUSTING THE LONGITUDINAL CENTER OF GRAVITY OF SAID ARM ASSEMBLY, SAID COUNTERWEIGHT INCLUDING MEANS HAVING THREADED ADJUSTMENT TRANSVERSELY OF THE ARM FOR ADJUSTING THE TRANSVERSE CENTER OF GRAVITY OF SAID ARM ASSEMBLY; A BEARING MOUNTING FOR SAID ASSEMBLY INCLUDING A PIVOT PIN, HAVING MEANS FOR MOUNTING IT IN VERTICAL POSITION AND ALSO AN INVERTED HOOD HAVING A DEPENDING APRON EXTENDING DOWNWARDLY ON ALL SIDES THEREOF MOUNTED ON SAID ARM ADJACENT THE DESIRED TRANSVERSE AND LONGITUDINAL CENTER OF GRAVITY OF SAID ARM ASSEMBLY AND FORMED WITH A LONGITUDINALLY ELONGATED OPENING AT ITS LOWER END, TAPERING UPWARDLY TO A CLOSED UPPER END DISPOSED ABOVE THE VERTICAL CENTER OF GRAVITY OF SAID ARM ASSEMBLY, WITH THE SAID UPPER END SERVING AS A BEARING SEAT FOR THE UPPER END OF THE PIVOT PIN, WITH THE OPENING IN THE HOOD BEING SUFFICIENTLY ELONGATED AT ITS LOWER END IN A DIRECTION LONGITUDINALLY OF THE ARM SO THAT THE ARM MAY TILT LONGITUDINALLY AND BEING JUST WIDE ENOUGH TO FREELY ACCOMMODATE THE PIVOT PIN SO AS TO PREVENT TRANSVERSE TILTING OF THE PICK-UP ARM ASSEMBLY; AND TRACKING FORCE ADJUSTMENT MEANS MOUNTED ON SAID ARM BETWEEN THE SAID HOOD AND THE HEAD FOR SLIDING ADJUSTMENT LONGITUDINALLY OF THE ARM TO ADJUST THE TRACKING FORCE AT THE HEAD END OF THE ARM.