Safety brake

Claim 1

A BRAKE MECHANISM COMPRISING A HOUSING, A HOLLOW GUIDE MEMBER FIXEDLY POSITIONED AXIALLY IN SAID HOUSING, A DISHED RUBBER DIAPHRAGM HAVING A CENTRAL PORTION AND ANGULAR SIDE WALL POSITIONED IN SAID HOUSING AND SPACED AXIALLY FROM ONE END OF SAID HOUSING AND PERIPHERALLY CONNECTED IN SAID HOUSING, A PRESSURE PLATE IN SAID HOUSING ABUTTING THE CENTRAL PORTION OF ONE SIDE OF SAID DIAPHRAGM, SAID HOLLOW GUIDE MEMBER CONNECTED TO ONE END OF SAID HOUSING, A COIL COMPRESSION SPRING IN SAID HOUSING POSITIONED ABOUT SAID GUIDE MEMBER AND POSITIONED BETWEEN SAID PRESSURE PLATE AND END OF SAID HOUSING, SAID SPRING BIASING SAID PRESSURE PLATE AND DIAPHRAGM AWAY FROM SAID ONE END, A HOLLOW PLUNGER CONNECTED TO SAID PRESSURE PLATE AND CENTERED IN SAID HOUSING BY SAID GUIDE MEMBER DURING AXIAL RECIPROCATION OF SAID PLUNGER, A FLUID PRESSURE CONNECTION TO SAID HOUSING ON THE OTHER SIDE OF SAID DIAPHRAGM AND BOLT MEANS ACCESSIBLE FROM THE EXTERIOR OF SAID HOUSING, EXTENDING INTO SAID HOLLOW PLUNGER AND AXIALLY MOVABLE IN SAID HOLLOW PLUNGER FOR LOCKING SAID PLUNGER AND SAID SPRING WITH THE SPRING IN COMPRESSED CONDITION, A SECOND HOUSING MOUNTED ON SAID FIRST NAMED HOUSING, A BARRIER WALL BETWEEN SAID FIRST NAMED HOUSING AND SAID SECOND HOUSING, A DIAPHRAGM IN SAID SECOND HOUSING AXIALLY SPACED FROM SAID BARRIER WALL AND CONNECTED AT ITS PERIPHERY TO SAID HOUSING, A PRESSURE PLATE MOUNTED IN SAID SECOND HOUSING ABUTTING ONE SIDE OF SAID SECOND DIAPHRAGM, A MOTION TRANSMITTING CONNECTION BETWEEN SAID PLUNGER AND SAID LAST NAMED PRESSURE PLATE, AND A FLUID PRESSURE CONNECTION TO SAID SECOND HOUSING BETWEEN SAID BARRIER WALL AND SAID LAST NAMED PRESSURE PLATE.