Locking devices for mould closing mechanism

Claim 1

IN A MOLDING MACHINE HAVING A HOUSING, A THREADED SPINDLE ROTATABLY MOUNTED IN SAID HOUSING, A ROTATABLE MOLD-CLOSING MEMBER MOUNTED FOR AXIAL DISPLACEMENT ON SAID SPINDLE BETWEEN A FIRST AND SECOND POSITION IN RESPONSE TO ROTATION OF SAID SPINDLE, ROTARY DRIVE MEANS OPERATIVE FOR ROTATING SAID SPINDLE, AND BRAKE MEANS ASSOCIATED WITH SAID DRIVE MEANS AND OPERATIVE FOR ARRESTING ROTATION THEREOF, THE IMPROVEMENT CONSISTING IN THE PROVISION OF AUXILIARY BRAKE MEANS INCLUDING A FIRST ABUTMENT FACE PROVIDED ON SAID MEMBER AND EXTENDING AT A RIGHT ANGLE TO THE AXIS OF SAID SPINDLE FACING IN A GIVEN DIRECTION; AND A STATIONARY AUXILIARY BRAKING ELEMENT CARRIED BY SAID HOUSING AND HAVING A SECOND ABUTMENT FACE FACING OPPOSITELY SAID GIVEN DIRECTION IN SLIDING ENGAGEMENT WITH SAID FIRST ABUTMENT FACE WHEN SAID MEMBER IS IN SAID FIRST POSITION, AT LEAST SAID SECOND ABUTMENT FACE BEING OF MATERIAL WHICH IS SOFTER THAN THE MATERIAL OF SAID FIRST ABUTMENT FACE, DISPLACEMENT OF SAID MEMBER FROM SAID FIRST TOWARD SAID SECOND POSITION RESULTING IN ENGAGEMENT OF SAID ABUTMENT FACES WITH INCREASING PRESSURE, SAID AUXILARY BRAKE MEANS AFFORDING AUXILIARY BRAKING ACTION UPON SAID PRESSURE REACHING A PREDETERMINED VALUE.