Visor detent device

Claim 1

A HELMET, COMPRISING: (A) A SHELL ADAPTED TO RECEIVE THE HEAD OF A WEARER; (B) A VISOR SUPPORTED ON THE SHELL FOR MOVEMENT ALONG A PATH EXTENDING BETWEEN AN EYE SHIELDING POSITION AND A RETRACTED POSITION ABOVE THE FORWARD PORTION OF THE SHELL; (C) A COVER FIXED ON THE SHELL AND COOPERATING WITH THE SHELL TO DEFINE A RECESS SUFFICIENTLY LARGE TO RECEIVE THE VISOR IN ITS RETRACTED POSITION WITH SUBSTANTIAL CLEARANCE BETWEEN THE VISOR AND THE COVER AND ALSO BETWEEN THE VISOR AND THE SHELL, SAID COVER HAVING AN ELONGATED CENTRAL FORE-AND-AFT SLOT AS LONG AS AND PARALLEL TO SAID PATH; (D) AN ELONGATED GRIPPABLE ELEMENT FIXED IN A POSITION ADJACENT THE SLOT AND SPACED FROM SAID VISOR AND EXTENDING SUBSTANTIALLY THE FULL LENGTH OF THE SLOT; AND (E) A MANUALLY OPERABLE VISOR POSITION ADJUSTING ASSEMBLY EXTENDING FROM THE VISOR OUTWARDLY THROUGH THE SLOT IN THE COVER, SAID ASSEMBLY COMPRISING: (1) TWO COOPERATING THREADED MEMBERS RELATIVELY ROTATABLE ABOUT AN AXIS EXTENDING THROUGH THE SLOT; (2) MEANS SPACED FROM THE COVER AND CONNECTING ONLY ONE OF THE THREADED MEMBERS TO THE VISOR FOR CONCURRENT MOVEMENT THEREWITH, SAID CONNECTING MEANS HOLDING SAID ONE MEMBER AGAINST SUBSTANTIAL ROTATION WITH RESPECT TO SAID VISOR WHILE THE OTHER MEMBER MAY ROTATE WITH RESPECT TO THE ONE MEMBER AND THE VISOR; (3) THE OTHER OF SAID MEMBERS HAVING A MANUALLY GRASPABLE PORTION AT THE OUTER END OF SAID ASSEMBLY TO FACILITATE ROTATION OF SAID OTHER MEMBERS; AND (4) TWO CLAMP MEMBERS SPACED ALONG SAID AXIS ON OPPOSITE SIDES OF SAID GRIPPABLE ELEMENT AND OPERABLE INTO AND OUT OF GRIPPING ENGAGEMENT WITH SAID ELEMENT BY RELATIVE ROTATION OF SAID THREADED MEMBERS WHILE THE VISOR REMAINS FIXED TO THE ONE THREADED MEMBER DURING SAID RELATIVE ROTATION, WHEREBY SAID VISOR MAY BE MOVED TO AND HELD IN ANY SELECTED POSITION ALONG ITS PATH BY TRANSLATION AND ROTATION OF SAID OTHER THREADED MEMBER.