referring to fig1 - 7 , the improved , custom - formed wheelchair seat 25 , constructed in accordance with the present invention , is shown mounted on a wheelchair 26 by means of a plurality of quick - connect trunnion mounts 27 -- 27 . seat 25 includes a back - supporting frame 33 , a buttocks - supporting frame 34 , and a pair of l - shape hinge members 35 , 36 which maintain the back and buttocks supporting frames in predetermined spatial relation to one another while providing for adjustable spatial and angular relation therebetween . the back - supporting frame 33 and buttocks - supporting frame 34 are made in predetermined stock sizes and may be identical or differ in size depending on the user &# 39 ; s needs . referring to fig5 back - supporting frame 33 includes a generally planar rectangular back or web centersection 37 and opposed vertical flanges 38 , 40 , respectively , which extend forwardly at right angles from the opposed side boundaries of the central web 37 . each flange includes thereon toward the top thereof a substantially cylindrical trunnion 29 , 29 , extending laterally outwardly thereof for quick releasable connection to trunnion mountings 27 -- 27 , a plurality of aligned spatially related apertures 43 -- 43 , 44 -- 44 , respectively , provide for retaining the back - supporting frame to the respective hinges 35 - 36 , respectively , by means of links 45 -- 45 ( only one shown ) having like threaded apertures 46 - 47 therein for retaining threaded fasteners 68 -- 68 therein . additional aligned apertures 48 -- 48 , 49 -- 49 and 50 -- 50 , forming a generally u - shape grid are adapted to retain other members , to be discussed in greater detail below , onto the frame . lastly , the back - supporting frame flanges 38 - 40 each include a distal cushion - retaining rib 38a , 40a , respectively , extending 90 degrees inwardly from the forward edge of each flange . as a result of these features , the back - supporting frame 33 will maintain a back - supporting cushion positioned therein , be quickly releasably retained by trunnions 28 - 29 to a wheelchair frame , and be adjustably mounted in a desired spatial and angular relation to through hinges 35 - 36 , a like shaped buttocks - supporting frame member 34 . as also shown most clearly in fig5 the buttocks - supporting frame 34 , depending upon the needs of the user , may be identical or substantially similar in shape to the back - supporting frame 33 . frame 34 includes a central - rectangular , horizontally - positioned web section 52 vertical flanges 53 , 54 , extending from the opposed side edges thereof , and a pairs of ribs 55 - 56 , extending inwardly from the top distal edges of flanges 53 - 54 , respectively , for retaining a seat cushion positioned centrally therein . each vertical flange 53 , 54 has a laterally extending trunnion 28 , 28 , respectively , positioned near the front end of the flange , and a plurality of apertures 59 -- 59 and 61 -- 61 , which are adapted to retain the lower portions of hinges 35 and 36 in predetermined adjustable spatial and angular relation to the back - supporting frame 33 , the mounting between hinges 35 , 36 , and buttocks supporting frame is accomplished by threaded fasteners and links 45 , shown in connection with the back - supporting frame 33 . the series of spaced double rows of apertures 62 -- 62 , 63 -- 63 , and 64 -- 64 , roughly in a u - shape are utilized to mount arm rests and foot rests to the frame , as will be shown in more detail below . as shown most clearly in fig1 - 4 , each l - shaped hinge 35 , 36 ( with hinge 35 shown for explanation ) includes a horizontally - extending base 61 and a vertically - extending arm portion 62 . adjacent the distal end of the base 65 are a pair of arcuate slots 67a - 67b , adjustably retained by threaded fasteners 67 -- 67 . adjacent the distal end of the upwardly - extending arm member 66 are a second pair of arcuate slots 68a - 68b , adjustably retained by threaded fasteners 68 -- 68 . an aperture 69 on l - shape hinge 35 may be used as s seat belt mounting , as shown in fig3 . the dual pivotal mounting of back - supporting frame 33 and the buttocks - supporting frame 34 with relation to hinges 25 , 26 , provides heretofore unknown amounts of flexibility and adjustability to the shape of the complete seat . also , as shown in broken line in fig3 the plurality of spatially related apertures 43 , 44 , on back - supporting frame 33 , and 59 , 61 on buttocks - supporting frame 34 , allow movement of the vertical frame up and down and the horizontal frame inwardly and outwardly to provide a proper size and shape seat for a user , and for growth of an individual utilizing the seat . referring to fig2 , 6 , and 7 , trunnion mounts 27 , each include a conventional clamp 30 having dished or oval clamping surfaces which is adapted for selectably releasable fixed mounting to a conventional wheelchair or square - tubed stroller , linking member 31 rotatably mounted to clamp 30 , and a quick - release connection composed of a threaded shaft 41 , extending normally from link 31 and having a recess 41a on the distal end thereof into which the end of a trunnion 28 - 29 may be inserted and engaged , and an internally threaded collar 42 which , when extended over the recess 41a and into engagement with the base of trunnion 28 , retains the trunnion in the recess . a knurled or otherwise roughened outer surface on collar 42 , provides for hand maneuvering of same along the threads on shaft 41 . the remainder of the seat of applicant &# 39 ; s invention includes a custom - formed , back - supporting cushion , generally indicated at 70 and a custom - formed , buttocks - supporting cushion , generally indicated at 71 , which removably mount in frame members 33 , 34 , respectively , and a plurality of peripheral items , including left and right thigh support - arm rest members 72 , 73 , respectively , which selectably mount onto either the buttocks - supporting frame member 34 or the back - supporting frame member 33 , by means of pairs of articulated arm members 74 - 75 , including a base 74a - 75a which is adjustable affixable to either seat frame by common threaded fasteners retained through slots in the base , and a pad holding member 74b - 75b which is adjustably , swingably mounted to the base in a manner similar to the swingable mounting of chest supporting member 86 discussed below . each arm rest pad and pad holding member may be selectably released to swing upwardly out of the way of a path for transferring an individual in or out of the seat , and then returned to a body supporting position . the upper inwardly dished surfaces 72a , 73a , respectively , of the thigh support - arm rest members 72 , 73 , may be utilized to locate and rest the chair user &# 39 ; s arm and elbow thereon while the sloped but substantially vertical side 72b , 73b of each respective arm support is utilized to support the thighs of the user , allowing each ingress and exit when the pads are not swung upwardly out of the way . with the extreme base of adjustability of the seat assembly of the present invention , the only tool required for adjustment is a wrench , and adjustments may be made in the field at the user &# 39 ; s situs . referring to fig7 - 13 , other accessories mountable and demountable to the chair , in an adjustable manner similar to the arm rest members , include a neck - head brace assembly 78 , including a contoured neck pad 80 thereon which is adapted to conform to the curvature of the user &# 39 ; s neck and head - bottom . pad 80 is moulded around a malleable frame ( not shown ) which is bendable to conform to the user &# 39 ; s neck and head shape . neck brace assembly 78 further includes an adjustable head - support mounting 81 , which is retained on the back side of the back - supporting frame 33 by threaded fasteners 82 -- 82 extending through mounting 81 and apertures 48 -- 48 on frame 33 to be retained by link 83 . an extension rod 82 , which is adjustably pivotally mounted at 83 to the back of pad 80 and slidably and selectively , rotatably retained on the top of mounting 81 by clamp 84 . the double row of apertures 48 -- 48 and 81a - 81a , with the spatial distance between apertures 81a being one - half the spatial distance between apertures 48 in both directions provide for abundant adjustability , both vertically and laterally . as shown most clearly in fig1 , by switching the alignment of apertures from the left vertical column to the right vertical column on mounting 81 , the mounting may be adjusted laterally in increments one - half the width of the distance between apertures 48 -- 48 . as shown in fig1 - 5 and 8 - 9 , a chest or body supporting member , generally indicated at 86 , which is adjustably mountable on the back of frame 33 , includes a curved cushion 87 , which like neck support pad 80 , includes a malleable frame ( not shown ), and an articulated mounting linkage 88 - 90 between the frame 33 and cushion 87 . the l - shaped base 88 of the articulated mounting linkage includes a distal foot 88a , including a plurality of elongate mounting slots 88b , in fig2 therethrough similar to those shown in connection with articulated arm rest supports 74 - 75 . base 88 is adjustably mounted to back supporting frame 33 by threaded fasteners and link 77 through apertures 49 -- 49 , 50 -- 50 in a manner similar to the mounting of the previously noted accessory items . mid - link 90 is mounted at one end to l - shape arm 88 by means of pivot pin 91 for horizontal pivotal movement , and is mounted at its opposing end to cushion 87 for rotational movement therebetween around pin 93 with angular adjustment between the cushion and link being variable by means of a cam 92 , which is coaxial with and sandwiched between the cushion 87 and mid - link 90 . a spring loaded stop mechanism 91a , mounted on mid - link 90 adjacent one end of pin 91 , selectably , releasably engages apertures in a flanged sleeve 89 , concentrically mounted with pin 91 , to allow pivotal movement between base 88 and mid - link 90 when desired . the rotation of cam 92 relative to mid - link 90 approximates 180 degrees and is limited by a pair of arcuate slots 94 -- 94 positioned through mid - link 90 surrounding an aperture for pin 93 in spatial relation thereto . screws 95 -- 95 mount into the back side of cam 92 , ride in slots 94 -- 94 and may be tightened into binding relation with the side edges of the slots when fixed positioning is desired . the opposed distal ends of slots 94 -- 94 provide stops preventing further rotation between the cam 92 and mid - link 90 . pin 93 is threaded into cushion 87 at one of a plurality of threaded apertures to provide for rotational or fixed positioning therebetween and for length adjustment , as desired . loosening screws 95 -- 95 and / or cushion 87 from pin 93 allow the cushion 87 to be rotated until the fit of the cushion against the user is proper and comfortable . then , the screws may be turned to fix the cushion 87 and cam 92 relative the mid - link 90 . referring to fig1 - 5 , a pair of adjustable foot rests 96 -- 96 are mounted by the afore - disclosed threaded fasteners and links ( not shown ) fastened through apertures 64 -- 64 adjacent the front of buttocks - supporting frame 34 so as to depend therefrom . each foot rest 96 includes an adjustable triangulated base 97 which is hinged at its corners and has overlapping distal ends forming the hypotenuse thereof . a plurality of apertures 97a are positioned all along the base for providing adjustability to the foot rest . a stirrup 98 is mounted on the front of base 97 by conventional fasteners and , as a result of the multitude of apertures 98a on the stirrup and base , is adjustable in its vertical positioning . by lessening or increasing the overlap of the distal ends of base 97 , stirrup 98 may be moved arcuately for user &# 39 ; s comfort as desired . the corners of triangulated base 97 are held together by push pins 99 to provide ease of disassembly and adjustment . thus , the new and improved quickly mountable - demountable seat of the present invention has been shown and described as it mounts onto a wheelchair of conventional manufacture . referring to fig2 , and more generally to the method disclosed in fig1 - 23 , the improved seat of the present invention includes a custom - formed , back - support cushion 60 having a generally rectangular outline sized for being press fit into the back - supporting frame 33 . each cushion has an outer frontal surface 127 , preferably formed of a vinyl material , which is heated and stretched into the desired shape to provide a seamless cushion cover . the bulk of the cushion is made of polyurethane foam which is poured into the desired shape and expands and sets to produce the custom - moulded cushions 60 and 61 in the shapes desired , as will be disclosed more fully hereafter by explanation of the preferred method of moulding means . when custom moulding the seat cushions 60 - 61 , a bean - bag type moulding apparatus , generally indicated at 100 , is used . it includes a back - support moulding frame 101 , a buttocks - support moulding frame 102 positioned in slidable and angularly adjustable spatial relation thereto , with both being adjustably mounted on a linkage controlled mounting platform 103 . in a manner functionally similar to the living hinges 35 , 36 discussed previously , hinge mechanisms 104 , 105 ( only one shown ), provides adjustable angular and lateral positioning of the back - support moulding frame 101 and the buttocks - support moulding frame 102 . the back - support moulding frame 101 and buttocks - support moulding frame member 102 are slightly larger than the largest of the stock size cushions made in accordance with the present invention which will fit in commercial wheelchairs . cushions may be made smaller than the framework of the present invention by cutting the size of the mould made in the frame , as will be described in more detail below . a first bean - bag 106 , in this embodiment preferably formed of latex with polyethylene beads ( not shown ) therein , is mounted on the back - support moulding frame 101 , and likewise , a second bean - bag 107 , made of identical materials , is mounted horizontally in the buttocks - support moulding frame 102 . a vacuum system includes a manifold 108 mounted on frame platform 103 and having a first vacuum line 110 in fluid communication with the interior of first bean - bag 106 . the pressure inside first bean - bag 106 is controlled by a vacuum generator ( not shown ) which is attached through air line 111 to manifold 108 , and a first control valve 112 in line 90 . likewise , a second vacuum line 113 is connected between manifold 108 and second bean - bag 107 and includes a second control valve 114 therein . with both moulding frames positioned nearly horizontal , a partial vacuum is drawn through manifold 108 and line 90 into the back - support bean - bag 106 . as shown in fig1 , once a partial vacuum is achieved , the polyethylene beads in the bag are moved or maneuvered by hand to a position of rough approximation of the cavity desired for the seat user . the amount of vacuum in the bag 106 may be controlled by valve 112 ( at about one - half inch hg ) to make the polyethylene beads in the bag 106 highly moveable when the preforming operation begins , and with a vacuum of about 3 inches hg , the bean bag becomes hard and immobile . likewise , valve 114 is utilized to control a partial vacuum in bean - bag 107 to rough form the bag to the approximate shape of the user , as shown in fig1 , cutouts 101a -- 101a in the web of back - support moulding frame 81 allow adjacent portions of the bean - bag to be pushed outwardly to aid in properly fitting the bag to the trunk area of the user . as shown in fig1 , after the preforming has been completed , the frame 101 is positioned vertically as desired , and an individual for whom custom - molded seat cushions are to be made , is seated on the bean - bags 106 , 107 . the hands of the moulder , the weight of the proposed cushion user , and control valves 112 - 114 are all utilized to move the polyethylene beads in the latex bean - bags 86 , 87 , to ideally fit the shape of the user . after proper fit has been obtained , any desirable corrective shaping of the cushions is made by the moulder and the corrective shaping may be tested on the proposed user , as desired . once a proper shape for the proposed cushions has been obtained , the control valves 112 - 114 are adjusted to a vacuum approximating 3 inches hg , which hardens the bean - bags 106 - 107 to prevent additional shape change . thereafter , the individual for whom the cushions are to be made is lifted off of moulding frame 100 and bean - bags 106 and 107 . as shown in fig1 , plaster impregnated gauze strips 115 , 116 , are wetted and laid on the bean - bags to make a positive mould of the desired shape of the proposed seat cushion . after the gauze strips 115 , 116 , are allowed to harden , a positive mould such as that shown at 117 , 118 , in fig1 , is lifted off of the bean - bags . if additional corrective changes need be made to positive moulds 117 , 118 , or if it appears their shape should be changed for any reason , plaster material may be added to or substracted from the positive moulds as desired , such as , by removal of or addition of materials to areas denoted in circular outline at 120 and 121 on positive moulds 117 , 118 . it should be noted that it is the back sides ( not shown ) of mould positive 117 and mould positive 118 , which are utilized as the surfaces which the contour of the custom - made cushions will follow . it should be noted that as shown most clearly in fig1 - 18 , the latex surface of bean - bags 106 - 107 , together with the polyethylene beads thereunder , may , when the bags are drawn to a high vacuum , have a bead - textured surface . this textured surface will translate directly to the positive moulds 117 , 118 . as the positive mould shells 117 , 118 , are made of plaster held together by gauze , the back - side surface may be sanded or otherwise worked to provide a smooth surface for the cushions to be made on . referring to fig2 , a trial surface for the proposed custom - fitted cushions may be made by laying a heated sheet of thermoplastic material over the back side of mould positives 117 , 118 and allowing same to cool . thus , trial shape back - support member 122 and buttocks - support member 123 may be formed and held together by mounting 124 . if the intended user of the cushions is not located in the immediate geographic area where the cushion - making process is taking place , the trial shels 122 , 123 may be shipped inexpensively to any location to determine if the proposed seat shape is proper . as the individual is seated in the trial - shape seat 122 , 123 , any necessary changes may be noted and corrections thereafter made on the mould positives 117 , 118 , as necessary the trial seat also has another use , as mounting cups ( not shown ) or other base materials may be affixed to the shell bottom and the seat may be utilized as a bathing seat for the user of the cushions . as shown in fig2 and 22 , the back - side of a mould positive 125 , which is similar to the mould positive 117 , 118 , disclosed previously , has been cut to a desired rectangular size and thereafter encircled or placed into a frame 126 having depth which is at least the desired depth of the cushion to be made . a sheet of vinyl material 127 is heated and vacuformed inside - out over the back side of the plaster positive 125 and framing material 125 until it conforms to the desired cushion shape and outline . the material extending over the frame may be utilized to protect the frame from any spills or mess - making procedures . as shown in fig2 , polyurethane foam 138 is then poured into the frame 126 to a desired depth . it should be noted that the foam expands as it sets and will rise a certain extent . the poured fluid seeks all of the corners and cavities of the mould during the filling process . when the polyurethane foam completely sets , the excess vinyl sheet material 107 is trimmed and one of the custom - formed , seat cushions is completed and appears as shown at 60 and 61 in fig2 , the cushions may be press fit into the respective back - supporting frame 33 and / or buttocks - supporting frame 34 of the custom - formed seat 30 of the present invention . one of the advantages of the seat of the present invention is the expansibility of the seat lengthwise to accommodate growth of the individual for whom the seat is designed , and the expansibility of the seat both lengthwise and widthwise by the relatively inexpensive replacement of one or both custom - formed cushions 60 - 61 , and one or both seat frames if necessary , in the event the individual outgrows the first formed cushions . the custom moulding of second or additional cushions is considerably less expensive than the procurement of a complete new seat should the individual outgrow the seat as originally moulded . additionally , the custom moulding of seat - back support and buttocks - support cushions provides for substantial surface contact between the individual and the seat , thus minimizing pressure sores , which have heretofore been pronounced where point or small area contact between the user and the seat has been found . also in one of the most important features of the present invention , the adjustability and custom forming of the seat assembly places the users in a functional position , which is extremely important in cases of severe deformity . the custom - formed seat of the present invention is affixable to various commercial wheelchairs , such as , those sold under the trade marks everest and jennings , and invacare and stainless wheelchairs , as well as mclaren and pogon strollers . while one embodiment of the present invention has been shown and described , it will be obvious to those skilled in the art , that changes and modifications may be made within the scope of the present invention . therefore , it is the aim in the appended claims to cover all such changes and modifications as fall within the true spirit and scope of the invention .
an improved method for making custom molded seat cushions wherein a bead - filled latex bag is used as a trail buttocks supporting cushion and likewise another bead - filled latex bag is used as back - supporting cushion in a frame which is similar in function to the seat frame of the chair . an impression of a desired portion of a user &# 39 ; s body is formed on each of the bags and air is removed from the bags thereafter to fix the impression . a positive mold of the individual &# 39 ; s respective backside and buttocks impression are made . corrective changes may be made either to the latex bag impression as it is being formed or the positive mold impression . the positive mold impression is then utilized along with a mold frame to mold a custom fitted seat cushion for the individual who will utilize the wheelchair . the cushions are then press fit into their respective seat frames and an individualized custom molded wheelchair seat is formed which provides for correctively positioning the individual in full surface contact between the body and seat to minimize or rid the possibility of bed sores , and to place the client in a functional position .