Head protecting head gear

Claim 1

A HEAD PROTECTING HEADGEAR, COMPRISING, IN COMBINATION, AN OUTER HEAD COVERING HAVING A HEAD RECEIVING OPENING AND A YIELDABLY-RIGID HEAD PROTECTING SHELL HAVING A HEAD RECEIVING OPENING FITTED SNUGLY WITHIN SAID OUTER COVERING, WITH THE EDGES OF THEIR HEAD RECEIVING OPENINGS IN SUBSTANTIAL REGISTER, SAID PROTECTIVE SHELL HAVING A PLURALITY OF INWARDLY EXTENDING BANDS SECURED BY ONE EDGE AGAINST THE INNER FACE OF A MARGINAL EDGE PORTION OF THE HEAD RECEIVING OPENING THEREOF, IN PREFERABLY SPACED RELATION TO ONE ANOTHER, SAID SHELL BANDS HAVING THEIR OTHER END PORTION ENGAGED UPON A CONTRACTABLE ELEMENT, TO THEREBY FORM A SLING OF ADJUSTABLE DEPTH ADAPTED TO REST ON THE HEAD OF THE WEARER, A SWEAT BAND SECURED TO THE EDGE PORTION OF SAID HEAD RECEIVING OPENING OF SAID PROTECTED SHELL INWARDLY OF SAID BAND WITH ITS OUTER EDGE IN SUBSTANTIAL REGISTER WITH THE EDGE OF THE HEAD RECEIVING OPENING OF SAID SHELL, AND MEANS RELEASABLY INTERENGAGING SAID OUTER HEAD COVERING AND SAID PROTECTING SHELL AT SPACED POINTS ALONG THEIR MARGINAL EDGE PORTIONS, SAID INTERENGAGING MEANS COMPRISING INTERNALLY THREADED STUDS SECURED ON SAID SHELL AND PROJECTING FORM THE EXTERIOR THEREOF, REGISTERING OPENINGS FORMED IN SAID OUTER HEAD COVERING, SAID STUDS EXTENDING INTO SAID OPENINGS, AND A THREADED ELEMENT HAVING A HEAD THREADED INTO EACH OF SAID STUDS FROM THE EXTERIOR OF SAID OUTER HEAD COVERING.