Thermoplastics beaker deep drawing appts - with pneumatically controlled diaphragm piston for inversion of bombed base

摘要

Thermoplastics beaker deep drawing apparatus comprising a matrix provided at its lower end with slidable beaker base forming split member is fitted below the member with a support in which is mounted a pneumatically controlled diaphragm piston serving for inversion of the bombed base to form an upwardly convergent lip against the inner wall of the split member by a diaphragm rolling action.