Tailstock centre apparatus with a pressure indicator

Claim 1

A TAILSTOCK CENTRE APPARATUS COMPRISING IN COMBINATION A CENTER MEANS EXTENDING CENTRALLY AND LONGITUDINALLY OF THE APPARATUS; A SLEEVE MEANS CO-AXIAL WITH AND SURROUNDING, SAID CENTRE MEANS, AND HAVING A RADIALLY EXTENDING WALL PORTION, SAID CENTRE MEANS BEING SUPPORTED FOR ROTARY MOVEMENT WITHIN SAID SLEEVE MEANS, SAID CENTRE MEANS AND SAID SLEEVE MEANS BEING INTERCONNECTED FOR RESILIENT TO AND FRO MOVEMENT IN THE AXIAL DIRECTION; A HOLLOW HOUSING CO-AXIAL WITH, AND SURROUNDING, SAID SLEEVE MEANS AND HAVING A RADIALLY EXTENDING WALL PORTION OPPOSITE SAID RADIALLY EXTENDING WALL PORTION OF SAID SLEEVE MEANS, SAID SLEEVE MEANS AND SAID CENTRE MEANS BEING AXIALLY DISPLACEABLE WITHIN SAID HOUSING; RESILIENT MEANS RESILIENTLY ACTING IN THE AXIAL DIRECTION AND INTERPOSED BETWEEN SAID RADIALLY EXTENDING WALL PORTIONS OF SAID SLEEVE MEANS AND SAID HOUSING; AT LEAST ONE THROUGHBORE IN SAID HOUSING EXTENDING FROM THE OUTSIDE TO THE INTERIOR THEREOF; AN OPERATING SURFACE ON SAID PRESSURE TRANSMITTING SLEEVE; A PIN HAVING AN INNER AND OUTER END AND RECEIVED IN SAID THROUGH-BORE FOR SLIDABLE TO AND FRO MOVEMENT; THE INNER END OF SAID PIN BEARING AGAINST, AND COOPERATING WITH, SAID OPERATING SURFACE, WHEREBY UPON AN AXIAL MOVEMENT OF SAID CENTRE TAKING PLACE UNDER THE INFLUENCE OF PRESSURE EXERTED BY THE WORK-PIECE UPON SAID CENTRE A MOVEMENT OF SAID PIN RELATIVE TO ITS RESPECTIVE THROUGH-BORE IS CAUSED TO TAKE PLACE, SAID PIN BEING OF SUCH LENGTH THAT UPON THE PRESSURE EXERTED BY THE WORK-PIECE UPON SAID CENTER REACHING A PREDETERMINED VALUE THE OUTER FRONT END OF THE PIN LIES FLUSH WITH THE OUTER SURFACE OF SAID HOUSING SURROUNDING SAID PIN.