Marking punch for a plastics molding tool has a central rotating body with external thread engaging with internal thread in outer cylindrical body and a spring to maintain contact between both bodies

摘要

A hollow cylindrical outer body(2) has a bore(3) with an internal thread(21) and an end face(4). A central body(1) inserted axially into the bore has an annular collar(10) with a central end face(15) and a connecting pin(14) with an external thread. On rotation of the central body the external and internal threads engage with each other and on further rotation disengage. A hollow cylindrical outer body(2) has a bore(3) with an internal thread(21) and an end face(4). A central body(1) inserted axially into the bore has an annular collar(10) with a central end face(15) and a connecting pin(14) with an external thread. On rotation of the central body the external and internal threads engage with each other and on further rotation disengage. A compression spring(5) between the bore end face and a free end face(17) of the central body ensures that in their end positions both threads make positive contact with each other. In the axial direction(7) the external thread on the pin(14) has a conical thread section which merges into a cylindrical thread section. Correspondingly the internal thread(21) inside the bore(3) has a cylindrical thread section(23) which merges with a conical thread section(22). External and internal threads have a small helix angle. A free space is located between the annular collar(10) of the central body and the external thread. The conical external thread of the central body is at 75-85[deg] relative to a line perpendicular to the body axis.