Fastener devices

Claim 1

A FASTENER COMPRISING A U-SHAPED BAR HAVING A BIGHT PORTION AND LEGS SPRINGABLE FROM A CLOSED POSITION WHEREIN SAID LEGS ARE SUBSTANTIALLY PARALLEL, TO AN OPEN POSITION WHEREIN SAID LEGS DIVERGE, A CLOSURE MEMBER INCLUDING A PAIR OF SPACED, RIGIDLY POSITIONED WALLS SLIDABLE OVER SAID LEGS AND SPACED APART A DISTANCE TO FORCE SAID SPRINGABLE LEGS FROM SAID OPEN POSITION TO SAID CLOSED POSITION WHEN SAID CLOSURE MEMBER IS SLID OVER SAID U-SHAPED BAR INTO EMBRACING RELATIONSHIP THEREWITH, THE INNER, OPPOSING SIDES OF SAID LEGS EACH HAVING A GROUP OF CLOSELY SPACED, INTEGRALLY FORMED, SMALL PROJECTIONS EMANATING FROM SAID INNER SIDES, SAID PROJECTIONS OF EACH OF SAID GROUPS BEING ARRANGED IN TRANSVERSE, PARALLEL ROWS, SAID PROJECTIONS BEING SMOOTH-SIDED AND TAPERING FROM THE BASES THEREOF TO RELATIVELY POINTED OUTER ENDS, THE LONGITUDINAL AXES OF SAID PROJECTIONS OF EACH OF SAID GROUPS BEING STRAIGHT LINES EXTENDING AT SUBSTANTIALLY RIGHT ANGLES TO SAID RESPECTIVE ROWS AND OBLIQUELY TO SAID RESPECTIVE SIDES AT AN ACUTE ANGLE WITH RESPECT TO SAID SIDES, SAID PROJECTIONS OF EACH OF SAID GROUPS HAVING AN OCCURRENCE CORRESPONDING TO 200-500 PROJECTIONS PER SQUARE INCH OF SAID RESPECTIVE SIDE WHICH IS COVERED BY SAID GROUP OF PROJECTIONS, AND HAVING A HEIGHT FROM THE RESPECTIVE TIPS TO THE BASE IN THE RANGE OF 0.030 INCH TO 0.150 INCH, THE PROJECTIONS OF EACH OF SAID RESPECTIVE GROUPS SLOPING RELATIVE TO SAID SIDE IN A DIRECTION TOWARD SAID BIGHT PORTION WHEN SAID U-SHAPED BAR IS IN SAID CLOSED POSITION, AND EACH OF SAID GROUPS OF PROJECTIONS FORMING A UNIT OF SLOPING, CLOSELY SPACED, PENETRATING MEMBERS ADAPTED TO PENETRATE CLOSELY-SPACED SURFACE OPENINGS OF A FABRIC MATERIAL HELD BETWEEN SAID LEGS WHEN SAID BAR IS IN THE CLOSED POSITION, THE SHORTEST SIDE OF THE RESPECTIVE PROJECTIONS OF EACH OF SAID GROUPS ALSO DEFINING FROM THE RESPECTIVE BASE TO THHE RESPECTIVE TIP THEREOF A STRAIGHT LINE SLOPING AT AN ACUTE ANGLE RELATIVE TO SAID RESPECTIVE SIDE AND IN A DIRECTION TOWARD SAID BIGHT PORTION WHEN SAID U-SHAPED BAR IS IN SAID CLOSED POSITION, WHEREBY A PULLING FORCE IN A DIRECTION AWAY FROM SAID BIGHT PORTION ON THE FABRIC MATERIAL HELD BETWEEN SAID LEGS AND PENETRATED BY SAID PROJECTIONS CAUSES SAID MATERIAL TO BE FIRMLY AND DEEPLY SEATED ON SAID PROJECTIONS AND THEREBY FIRMLY GRIPPED BETWEEN SAID LEGS, SAID GRIPPED PORTION OF SAID FABRIC MATERIAL BEING QUICKLY RELEASABLE FROM SAID PROJECTIONS UPON OPENING OF SAID U-SHAPED BAR.