Vehicle seat track construction for use with seat belts

Claim 1

A SLIDING SEAT STRUCTURE COMPRISING AN ELONGATED FIXED SUPPORT HAVING A PAIR OF SPACED APART DOWNWARDLY EXTENDING FLANGES, AN UPWARDLY OPENING LOWER CHANNEL MEMBER FIXEDLY MOUNTED ON THE TOP SURFACE OF SAID FIXED SUPPORT, A DOWNWARDLY OPENING UPPER CHANNEL MEMBER INVERTEDLY ENCOMPASSING SAID LOWER CHANNEL MEMBER, EACH OF SAID CHANNEL MEMBERS HAVING A BASE PORTION AND A PAIR OF FLANGES, THE BASE PORTIONS OF SAID MEMBERS BEING IN OPPOSED SPACED RELATIONSHIP, ANTIFRICTION MEANS PROVIDED BETWEEN SAID MEMBERS TO PERMIT LENGTHWISE MOVEMENT OF SAID UPPER CHANNEL MEMBER WITH RESPECT TO SAID LOWER CHANNEL MEMBER, THE PAIR OF FLANGES ON SAID SUPPORT EACH HAVING A PLURALITY OF DOWNWARDLY OPENING NOTCHES THEREIN, THE PAIR OF FLANGES ON SAID UPPER CHANNEL MEMBER INCLUDING MOUNTING LUGS EXTENDING DOWNWARDLY AND TERMINATING BELOW ACROSS THE TOP SURFACE OF SAID SUPPORT, A CLOSURE PLATE EXTENDING ACROSS THE BOTTOM OF SAID CHANNEL MEMBERS AND FIXEDLY SECURED TO SAID MOUNTING LUGS, SAID CLOSURE PLATE FORMING A BRACE WHICH PREVENTS PORTIONS OF THE FLANGES OF SAID UPPER CHANNEL MEMBER FROM SEPARATING WHEN THE SEAT STRUCTURE IS SUBJECTED TO AN EXCESSIVE LOAD SO AS TO MAINTAIN SAID CHANNEL MEMBERS IN ASSEMBLED RELATIONSHIP, SAID CLOSURE PLATE BEING MOVABLE WITH SAID UPPER CHANNEL MEMBER, AND A LATCHING ELEMENT PIVOTALLY MOUNTED ON SAID CLOSURE PLATE, SAID LATCHING ELEMENT EXTENDING UNDERNEATH AND COMPLETELY ACROSS ALL OF SAID FLANGES AND MOUNTED FOR MOVEMENT IN A PLANE SUBSTANTIALLY PARALLEL TO SAID CLOSURE PLATE TO ENGAGE A PAIR OF TRANSVERSELY ALIGNED NOTCHES IN THE PAIR OF FLANGES ON SAID SUPPORT, SAID LATCHING ELEMENT WHEN IN LATCHING ENGAGEMENT IN THE PAIR OF ALIGNED NOTCHES PREVENTING HORIZONTAL DISPLACEMENT OF SAID UPPER CHANNEL MEMBER, SAID CLOSURE PLATE AND SAID LATCHING ELEMENT BEING SPACED FROM AND OUT OF CONTACT WITH SAID LOWER CHANNEL MEMBER.