Mold clamping fixture

In a fixture for clamping together two halves of a filled lens casting mold having annular mating surfaces, said mold having an upper mold half having a circular cupped surface, the improvement comprising:

• a base plate having a mold receiving recess;
• a clamping plate attachable to said base plate;
• a spring loaded mold engaging plunger depending from said clamping plate, said plunger being substantially aligned with said recess upon application of said clamping plate to said base plate, there being a spherically curved mold engaging surface at the terminus of said plunger for making contact with said circulary cupped surface of said upper mold half of a mold placed in said recess and for clamping said mold under the force of said spring loading, said mold clamping force being applied uniformly about said annular mating surfaces of said mold as a result of the contact of said spherical plunger terminus with said upper mold half.