Lock assemblage for adjustable leg rest

Claim 1

IN COMBINATION WITH AN ADJUSTABLE LEG REST FOR WHEEL CHAIRS INCLUDING A GENERALLY VERTICAL FIRST MEMBER, A SECOND MEMBER PIVOTALLY CONNECTED AT ITS UPPER END TO SAID FIRST MEMBER, AND MEANS CARRIED ON SAID SECOND MEMBER FOR SUPPORTING A PERSON''S LEG, A LOCK ASSEMBLAGE FOR SAID LEG REST COMPRISING, (A) A GENERALLY HORIZONTAL ROD PIVOTALLY CONNECTED AT ONE END TO SAID SECOND MEMBER AT A POINT BENEATH THE PIVOTAL CONNECTION OF SAID FIRST AND SECOND MEMBER; (B) A LEVER HAVING A HORIZONTAL U-SHAPED PORTION CONNECTED TO THE FIRST MEMBER OF SAID LEG REST; (C) A KEEPER AFFIXED TO THE LOWER LEG OF SAID LEVER HAVING AN APERTURE THEREIN THROUGH WHICH SAID ROD FREELY EXTENDS; (D) A SLEEVE ENCIRCLING SAID ROD SO AS TO PERMIT SLIDABLE MOVEMENT OF SAID ROD WITH RESPECT THERETO; (E) A VERTICAL FLANGE AFFIXED TO ONE END OF SAID SLEEVE; (F) A HORIZONTAL FLANGE AFFIXED TO THE UPPER END OF SAID VERTICAL FLANGE AND OVERLYING A PORTION OF SAID ROD AND HAVING A TRANSVERSE SLOT THEREIN THROUGH WHICH SAID KEEPER PROJECTS; AND (G) A COIL SPRING INTERPOSED BETWEEN SAID KEEPER AND SAID SLEEVE IN AN ENCIRCLING RELATION WITH SAID ROD FOR NORMALLY COCKING SAID KEEPER INTO A TILTED POSITION WITH RESPECT TO SAID ROD SO AS TO CAUSE GRIPPING THEREOF TO THEREBY PREVENT MOVEMENT OF SAID ROD AND SECOND MEMBER TOWARD SAID FIRST MEMBER, (H) WHEREBY ACTUATION OF SAID LEVER INTO A POSITION TO CAUSE SAID KEEPER TO ASSUME A MORE NEARLY PERPENDICULAR RELATIONSHIP WITH SAID ROD WILL ALLOW SAID ROD AND SECOND MEMBER TO MOVE TOWARD SAID FIRST MEMBER.