a full appreciation of the disclosed insert can be gained by referring to the drawing . fig1 presents an exploded or assembly view of the disclosed insert 10 . in this preferred embodiment of the disclosed insert 10 , there are what could be characterized as three components of the insert . the most prominent portion is the step saddle 12 , which essentially creates the step - through in the side - wall of the tub 40 . the step - saddle 12 features an elongated step - plate 11 , which can be stepped over or upon to gain access to the interior of the tub 40 and a pair of step - plate flanges 14 running the length of the step - plate 11 to mate with and dress the elongated edges of the opening cut in the sidewall of the tub . the step saddle 12 also features a pair of end plates 13 each originating at the ends of the step - plate 11 and extending upward from and perpendicular to the step - plate 11 and generally parallel to each other . the end plates 13 define the ends of the step - saddle insert 10 and cover the sides of the u - shaped opening cut in the side - wall of the tub . to facilitate fitting the step saddle 12 within the opening created in the tub side - wall , each end plate 13 is preferably fitted with a top flange 17 , a pair of end plate flanges 15 and return lips 19 . the foregoing elements 17 , 15 and 19 are structural features designed to improve the fit and finished appearance of the installed insert 10 . affixed to , and perhaps even an integral part of , the step saddle 12 is an adjustable housing 20 which is typically a rectangular box - like structure extending from the bottom or underside of the step - plate 11 and extending through the elongated bottom opening cut in the tub 40 for the placement of the insert and resting on the bathroom floor . it is this housing 20 , in conjunction with support - housing 30 , that provides the improved strength and adjustability afforded by the instantly disclosed insert 10 . other inserts , most notably those of the prior art , supra , rest on the edges of the opening cut in the tub side - wall . installing an insert in this manner , without resting it on a support , other than the edges of the tub , provides an insert that is structurally deficient . such an insert can support little more than its own weight . notably , tub and shower users need to be forewarned against stepping , standing or sitting on the step - plate . by way of contrast , instructions for using the disclosed unit , far from warning against or discouraging stepping on it , encourage the placement of weight by providing a non - slip tread 16 on the anterior side of the step - plate 11 . and , to justify encouraging the placing of weight on the step saddle 12 of the insert 10 , the housings 20 and 30 , of the disclosed insert are positioned to transfer the weight of the step saddle 12 , and the weight of anyone choosing to step , stand or sit on the step - plate 11 , to the bathroom floor upon which the tub also rests . in a preferred embodiment , the adjustable housing 20 is a five - sided rectangular box - like structure . its top panel 26 will mate with or adhere to the bottom of the step - plate 11 . for added support , the top panel 26 will include transverse ribs 21 incorporated or molded into the panel 26 . these will aid in distributing any load or weight generally attributed to the bather . the adjustable housing 20 will also have two side panels 23 and two end panels 25 . there is no bottom panel . in the end panels 25 , there are exhaust ports 22 for the escape of air when the adjustable housing 20 is used in conjunction with the support - housing 30 . so , ideally , the adjustable housing 20 will fit over and enclose , with a snug friction fit , and be ultimately sealed in place to support - housing 30 with the bonding power of a strong sealant , of which there are several commercially available . air , temporarily entrapped in the adjustable housing will escape through the exhaust ports 22 . the support - housing 30 will typically be a rectangular box - like structure , not unlike the adjustable housing 20 . in most instances it will feature a pair of side panels 33 , a pair of end panels 35 and a bottom panel 36 . the bottom panel 36 is especially useful for attaching the support - housing 30 to the bathroom floor . typically an elastomeric sealant is all that is necessary to fix the support - housing 30 in place , but metal fasteners such as nails , staples or brads can also be used . additional ports 32 for the escape of air compressed by the nesting of the support - housing 30 within the adjustable housing 20 can be provided in the end panels 35 . the installation of the disclosed insert 10 will proceed generally as follows : an opening , generally u - shaped , is cut in the sidewall of the bathtub . typically , the tub is of the built - in variety of bathtub and not the porcelain - coated cast iron tub that sits on four legs . in most instances , the built - in tub has three sides encased in or by the surrounding wall and has a bottom perimeter that is flush with the floor on the exposed side . and , it is the exposed side that is chosen for alteration with an insert to make entry and departure easier . this opening , cut into the exposed sidewall of the tub , extends for a predetermined length within the sidewall and from the top of the sidewall , extends to a predetermined distance above the bottom of the bathtub . these predetermined distances are generally the dimensions of the step saddle 12 of the insert 10 . more specifically , a template is used to outline the portion of the tub 40 sidewall to be removed for the insertion and placement of the insert 10 . with the aid of the template , an outline is drawn on the sidewall of the tub , and the defined section is cut out and removed with the appropriate tools dictated by the composition of the tub . a pattern is then made of the cutout area of the tub . the pattern outline is then transferred to the return lips 19 on the insert 10 to mirror the cutout section of the tub , and the insert 10 is cut to fit . the insert 10 with all of its components , is then positioned in the cutout of the tub and aligned in the void of the cutout . it is then removed to permit the support - housing 30 to be secured to the bathroom floor with sealant , metal fasteners , or whatever is appropriate in the given instance . a bonding compound is then applied to the return lips 19 of the step - plate 11 and around the mating edges of the adjustable 20 and support 30 housings . the insert is then repositioned over the cutout opening with the underside of the step - plate 11 resting on edged of the cutout void . the adjustable housing 20 is then bonded to the support housing 30 with a suitable sealant ; and , finally , the return lips 19 , running the entire perimeter of the step saddle 12 are joined to the tub with a waterproof caulk or sealant to finish the placement of the insert 10 . after allowing a short period of time for the sealants to crosslink and cure , the insert is ready for use . while the foregoing is a complete and detailed description of the preferred embodiments of the disclosed insert , numerous variations and modifications may be employed to implement the all - important purpose of the disclosure without departing from the spirit of the invention ; and , therefore , the elaboration provided herein should not be assumed to limit , in anyway , the scope of the invention which is fairly defined by the appended claims .
this disclosure relates generally to a method and means for modifying an existing bathtub to facilitate access by creating a generally u - shaped opening in an external sidewall of the tub and positioning in said opening a generally u - shaped insert having a step saddle with an elongated step - plate and a pair of generally parallel end plates extending from the ends of the step - plate ; and a pair of a generally rectangular housings attached to the bottom of the step - plate and extending to rest directly on the floor , thus supporting said step saddle .