Lateral pressure detector for use with a phonograph record player

A pick up lateral pressure detector detachably mountable on the tone arm of a phonograph record player, said detector comprising

• a base detachably mountable with respect to said tone arm;
• a pivotal member so mounted with respect to said base that the axis of rotation thereof is substantially perpendicular to the surface of the phonograph record;
• a cantilever so mounted with respect to said pivotal member that it can oscillate with respect to said pivotal member at least in a direction substantially parallel to said phonograph record surface;
• a reproduction needle mounted on said cantilever adapted to engage the groove of said phonograph record;
• indicating means responsive to the rotation of said pivotal member and said cantilever about said axis of rotation of the pivotal member for indicating the lateral pressure of said record groove on said reproduction needle;
• and
• a variable righting mechanism including a first magnet mounted on said pivotal member and a second magnet mounted on said base, said magnets coacting with one another so that they tend to counteract the said rotation of said pivotal member and said cantilever about said axis of rotation of the pivotal member.

A pick up lateral pressure detector detachably mountable on the tone arm of a phonograph record player, said detector comprising

• a base detachably mountable with respect to said tone arm;
• a pivotal member so mounted with respect to said base that the axis of rotation thereof is substantially perpendicular to the surface of the phonograph record;
• a cantilever so mounted with respect to said pivotal member that it can oscillate with respect to said pivotal member at least in a direction substantially parallel to said phonograph record surface;
• a reproduction needle mounted on said cantilever adapted to engage the groove of said phonograph record;
• indicating means responsive to the rotation of said pivotal member and said cantilever about said axis of rotation of the pivotal member for indicating the lateral pressure of said record groove on said reproduction needle;
• and
• said indicating means including a pointer pivotally mounted on said base, said pointer having a first magnetic portion and said pivotal member having a second magnetic portion, said first and second magnetic portions so coacting with one another that, during said rotation of said pivotal member and said cantilever, said pointer is rotated to an indication indicative of said lateral pressure.