referring in detail to the drawings , a uniform cap 1 ( for illustrative purposes only ) is depicted as comprising an exterior perimeter or frame 10 fabricated of any suitable semi - rigid material , to the interior surface 11 of which the adjustable sweatband of the invention may be suitably secured as by stitchings 12 in upward spaced relation from the lower frame edge as shown at 13 ( fig1 and 6 ). the sweatband includes a generally flat , tubular casing defining an interior surface 30 , adapted in use to engage the wearer &# 39 ; s head , and an exterior surface 31 which , in use , normally faces the interior frame surface 11 . the sweatband is fabricated of any suitable smooth , soft , resilient and stretchable material such as , for example , expanded vinyl and has an internal channel or conduit 35 defined by an interior surface 32 . the channel may be formed by stitching opposite longitudinal edges of the sweatband together as shown at 33 . for attachment to cap frame surface 11 , an elongated edging 34 may be sewn between the stitching 33 and suitably stitched to and along substantially the entire inner circumference of frame surface 11 as shown at 12 ( fig5 and 6 ). when sewn to the cap frame , tension is preferably applied to the casing so that it will remain taut and have a smallest circumference no larger than the smallest head size anticipated . the ends of the sweatband overlap such that , when in its folded condition , a substantially continuous surface 30 thereof engages and fits upon a wearer &# 39 ; s head . however , the pliability of edging 34 will permit the sweatband to fold &# 34 ; inside - out &# 34 ; and depend below the cap frame for ease in size adjustment , as will become apparent hereinbelow . one end of sweatband channel 35 is suitably closed as by stitches 36 , whereas the other end is left open at 38 . a substantially vertical cut , opening or slot 37 is provided through surface 31 of the sweatband and is located in close spaced relation to the closed end thereof . an elongated size regulator strap 21 fabricated of any suitable semi - rigid material , such as plastic , is passed through casing slot 37 , along channel 35 and emerges through open end 38 . the width of the strap 21 is less than that of the channel to permit easy insertion and movement but not so much less as to permit any undue canting or tilting of the strap with respect to the sweatband . the end 40 of strap 21 adjacent to and projecting out of slot 35 is suitably affixed to casing surface 31 by any known means such as staples 44 and is provided with a plurality of circumferentially spaced projecting size tabs 41 ; the spacing between each tab corresponding , preferably , to one head size difference . suitable indicia may be provided , such as the word size and a direction arrow , adjacent the leading tab 42 as a reference to the user in choosing the correct size adjustment ; this being depicted at 43 . by way of example , the tabs 41 may be spaced approximately 3 / 8 of an inch apart , center to center . the other end or free end 50 of strap 21 projecting outwardly from casing opening 35 is provided with two parallel sets of circumferentially spaced holes 51 . adjacent holes of each set are , preferably spaced a distance equal to one head size . each of the adjacent holes of the other set are , preferably , staggered with respect to those of the first set such that they are vertically aligned approximately midway therebetween to permit half - size adjustability . suitable indicia 52 may be provided adjacent each hole of each set to provide an easy indicator of size . it should be noted that the hole sets 51 are in general horizontal alignment with the projecting tabs 41 such that only very slight upward or downward movement is necessary to snap the tabs through any set of holes . it can , thus , be seen that the hole sets 51 and tabs 41 function as cooperating means to lock the free end 50 of strap 21 to the sweatband casing . the operation of the improved adjustable sweatband of the present invention should be apparent . thus , when a size adjustment is desired , the sweatband is unfolded to expose the ends 40 and 50 of the regulator strap . the end 50 is pushed or pulled , relative to the fixed end 40 , until a hole of either set 51 corresponding to the desired size is aligned with and snapped over the lead tab 42 ; all other holes of the same set then being snapped over the remaining tabs to provide for a secure and stable attachment . the sweatband is then folded back into the cap frame , leaving only a smooth , cushioned and continuous surface 30 for engagement with the wearer &# 39 ; s head . the appearance and &# 34 ; feel &# 34 ; of the sweatband is then similar to those on fixed - size headgear . maximum expansion of the sweatband in response to strap movement is limited only by the circumference of the cap frame ; whereas , minimum contraction thereof is determined in part by the resiliency of the sweatband casing and in part by the degree of tautness thereof when the same is sewn into the cap frame by the stitching 12 . although a preferred embodiment of the present invention has been described and disclosed , changes will obviously occur to those skilled in the art without departing from the spirit thereof . it is , therefore , intended that the invention is to be limited only by the scope of the appended claims .
an adjustable sweatband for uniform caps and the like having a flat generally tubular resilient casing with one open end and one closed end and a vertical opening adjacent the closed end ; a semi - rigid regulator strap passing through the casing having one end extending beyond the vertical opening and fixed to the casing and the other end extending beyond the casing open end ; and circumferentially spaced tabs on the strap fixed end and circumferentially spaced openings on the strap free end .