Pen holder for vertical and horizontal hold

A pen holder for holding a pen vertically or horizontally, comprising:

• a base, including
• an upper part, shaped like a circular pan turned upside down, having a concentric hole and a periphery, and
• a lower part, shaped like a circular pan, with a bottom and a periphery, with a hollow, concentric shaft extending upwards from said bottom, said shaft having a top side, which is open, said lower part having a plurality of upward extending radial ribs on said bottom, said periphery of said upper part being attached to said periphery of said lower part;
• an insertion part, vertically rotatably mounted on said base, said insertion part being made of two halves, each of said halves further comprising
• a half plate with an upper side and a horizontal longitudinal axis, and
• a quarter ball, attached to said upper side of said half plate, with a polar axis parallel to said longitudinal axis and a concave side opposite thereto,
• wherein said longitudinal axes of said two halves coincide and wherein said two halves both have guiding parts for gliding against each other along said longitudinal axes and are oriented in a way that said concave sides of quarter balls face each other;
• and
• two springs, each of said two springs mounted on one of said halves, pressing against said periphery of said lower part, such that said two halves of said insertion part are pressed together, leaning against each other.