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Publication numberUS3614793 A
Publication typeGrant
Publication dateOct 26, 1971
Filing dateSep 4, 1968
Priority dateSep 4, 1968
Publication numberUS 3614793 A, US 3614793A, US-A-3614793, US3614793 A, US3614793A
InventorsNemiroff Alfred
Original AssigneeP I Nemiroff Corp The
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Bathtub renovating apparatus and method
US 3614793 A
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Description  (OCR text may contain errors)

1971 A. NEMIROFF BATHTUB RENOVATING APPARATUS AND METHOD 2 SheetsSheet 1 Filed Sept. 4. 1968 INVENTOR ALFRED NEMIROFF BY 14% AT OR/NEYS Oct. 26, 1971 A. NEMIROFF BATHTUB RENOVATING APPARATUS AND METHOD ,2 Shoots-Shoot 2 Filed Sept. 4. 1968 INVENTOR ALFRED NEMIROFF United States 'fPaten 3,614,793 EATHTIUIB RENOVATTNG APPARATUS AND METHOD Alfred Nemiroif, New York, N.Y., assignor to The ll. ll. Nerniroff Corporation, New York, NY. Tiled Sept. 4, 1968, Ser. No. 759,261 llnt. Cl. A47k 3/00 US. Cl. 4173 12 Claims ABSTRACT OF THE DISCLOSURE Present methods of renovating and refurbishing multiple unit housing, for example, include the removal and disposal of the previously existing bathtubs. A great majority of such bathtubs have been built into and are partially supported by the bathroom Walls and are of a size which prevents their removal through doorways. Quite often such bathtubs and their associated plumbing have been installed during the construction of the housing prior to the erection of surrounding walls and framework. Thus a great deal of demolition Work must be performed in order to effect their removal, together with timely and costly reconstruction. During the time of such demolition and reconstruction, the bathroom is rendered unavailable to a family occupying the unit.

Apart from renovation of housing, recent interest in decorating and redecorating bathroom fixtures has increased. Damage and wear have rendered many bath tubs unsightly and in need of replacement. However replacement costs are relatively high due to the demolition and reconstruction work presently required. In addition, the selection of possible color schemes for a bathroom has always been limited by the color of porcelain fixtures such as the bathtub. The homeowner is faced with substantial costs if he desires to change the basic color of such fixtures.

Accordingly it is an object of the present invention to provide a method of and apparatus for refurbishing existing bathtubs.

Another object of the invention is to provide a bathtub liner for use with existing bathtubs which will completely cover and abscure the existing tub and which provides a new bathing container without requiring the removal of the old one.

A further object is to provide means for eliminating the need to remove existing bathtubs from housing being renovated and the accompanying demolition. A relatively inexpensive liner is added to the existing bathtub to form a composite structure which utilizes existing plumbing fixtures.

The present invention fulfills the aforementioned objects and overcomes limitations and disadvantages of prior art solutions to problems. According to one aspect of the present invention, a bathtub liner assembly having integrally formed ledge and tub portions is supported by and covers an existing bathtub which may have become unsightly or non-functional. The outer shape of the liner assembly is made to conform to the shape of the inside surfaces of the existing tub such that the liner is supported by its ledge portion upon the existing tub with its tub portion hanging therewithin. Waste and overflow holes 3,dl1,793 Patented Uct. 26, 1971 extending through the liner assembly tub portion are thereafter connected with plumbing fixtures to Which the waste and overflow outlets of the existing tub were connected. Voids between the liner assembly and the existing tub are filled with perlite or other material having sounddeadening and cushioning properties.

The invention will be more clearly understood from the following description of specific embodiments of the invention, together with the accompanying drawings, wherein similar reference characters denote similar elements throughout the several views, and in which:

FIG. 1 is an exploded perspective view of a bathtub liner assembly and an existing bathtub according to the present invention;

FIG. 2 is a sectional elevational view of the apparatus of FIG. 1;

FIG. 3 is a sectional elevational view looking along line 3-3 of FIG. 2;

FIG. 4 is an enlarged fragmentary sectional elevational view of an overflow plumbing connection useful in the present invention;

FIG. 5 is an enlarged fragmentary sectional elevational view of a waste plumbing connection useful in the present invention; and

FIG. 6 is an enlarged fragmentary sectional elevational view of another overflow plumbing connection useful in the present invention.

Referring now in more detail to the drawings, in FIG. 1 an existing bathtub 10 is shown installed in a bathroom and is partially built into bathroom wall 11 of the partition type, for example. Studding 12 is supported on hori zontal planks 13 and provides the supporting means for lathing, plaster and (in some cases) tile indicated generally as 14. While bathtub 10 is here illustrated for convenience as in a corner installation, it is more commonly in an alcove installation, enclosed in walls on three sides. Bathtub 10 includes a hollow tub portion 15 which is integrally formed, such as by deep drawing or casting with a ledge portion 16 extending around the cavity of tub portion 15. Ledge portion 16 includes on three sides thereof an upstanding or upturned flange 17 which is normally hidden and overlapped by or sealed into lathing, plaster, and tile 14 which, in turn, extends vertically downward to the upper surface of ledge portion 16 adjacent flange 17. Tub portion 15 is formed with an ordinary drain or Waste hole 18 therethrough as well as an overflow hole 19. Holes 18 and 19 are interconnected with the conventional type of bathroom waste plumbing. An overflow pipe 20 conventionally connects overflow hole 19 with a T-junction having one branch extending down to a plumbing trap 21 and another branch extending up to drain hole 18.

At the entrance side of bathtub 10, 21 depending extension 22 of ledge portion 16 forms a smooth vertical surface, extending partly or wholly to the floor. Where it extends only partly to the floor, an apron 23 is secured, such as by bolting, or welding to the bottommost part of extension 22 and extends to the bathroom floor so as to hide from view the usually unfinished underportions of bathtub 10. Apron 23 further acts as a support for the entrance side of tub 10 which is not supported within Wall 11.

The size of an existing bathtub such as bathtub 10 depends upon the size of the bathroom in which it is accommodated. For illustrative purposes, a porcelain enameled bathtub according to US. National Bureau of Standards Product Standard PS 5-66 has been Widely used and has an overall length of 60 inches with an overall width of 37 /8 inches. The tub cavity portion thereof includes a 52 /2 inch length by 2.3% inch width with a a maximum sloping inside depth of 17% inches. The overall height of such a bathtub including the apron 23 is 16 inches. Upturned flange heights are 1 inch. When such a conventionally installed bathtub has to be repaired or renovated, a great deal of difliculty and expense is created. The tub is generally installed directly on the building framing, so that to remove it requires demolitions and later reconstructions generally of three walls. Also, such tubs are exceedingly heavy weighing several hundreds of pounds, and their removal and replacement through doorways and halls, elevators, and the like, is awkward and difl'lcult. Moreover, new tubs are generally of different design from 20* or 30 year old tubs being replaced, and require different mountings, and supports, and are difficult to position with respect to the existing piping. It is also practically impossible to connect such new tubs to existing piping without breaking through the ceiling below, to get at the piping below the tub, and without breaking through the wall alongside the tub, to get at the overflow connection.

The foregoing difficulties are overcome by the present invention, with a consequent saving in materials and labor of at least 50% over prior methods of renovating such tubs. As will be seen from the following further description, the old tub need not be removed at all, requiring no breaking through or demolition of walls or ceiling. A new tub is simply placed within the old, and specially adapted for ready connections to existing piping and for sealing to existing walls.

A bathtub liner assembly '24 is shown in exploded form in FIG. 1 as including a tub portion 25 integrally formed with ledge portion 26. Liner assembly 24 is similar in shape to bathtub 10, tub portion 25 being smaller in size and Weight than tub portion 15. Liner assembly 24 is adapted to be quickly and easily inserted into bathtub as shown in FIG. 2 such that the ordinarily exposed surfaces of tub portion are entirely hidden, these surfaces possibly having been damaged, worn or being of an undesirable color. Ledge portion 26 is simply supported upon ledge portion 16 such that tub portion 25 is suspended within the hollow or cavity of tub portion v15. No further means of supporting the weight of liner assembly 24 is necessary, although of course any number of alternative supporting means are obvious. A liner assembly apron 27 is shown in FIG. 3 to obscure original apron 23, and is secured to a downwardly depending flanged extension 28 of ledge portion 26 by bolting, or other suitable means. Apron 27 is preferably secured to extension 28 prior to placement of liner assembly 24 over bathtub 10, although such attachment may in some cases be made afterwards.

The overall size of liner assembly 24 is such that it is easily transported within fully constructed buildings and through conventional sized doorways. There is no need to chop away or destroy existing partition walls, nor is there need to enter apartment units other than the unit within which the liner assembly is to be installed. Conventional methods of removing existing bathtubs in multiple unit housing, on the other hand, require detachment or destruction of existing waste and overflow plumbing, access to such plumbing being gained only through the apartment immediately beneath that in question. In addition, such conventional methods often include the extrication of the old tub through an adjoining bedroom partition wall, which must be destroyed since the existing finished bathroom lathing, plaster, and tile 14 surrounds and overlaps tub flanges 17 in order to afford Wa'Eefproofing and to avoid crevices which are difficult to keep clean. All of these costly, time consuming, and debris causing steps are unnecessary when employing liner assembly 24.

Thereafter, interconnections between an overflow hole 30 and a waste or drain hole 31 formed through tub portion 25 are made with overflow pipe and trap piping 21. Methods of making these interconnections are described below.

Since great numbers of existing bathtubs are made to identical specifications and since bathroom sizes for multiple dwelling units have become standardized, it is possible according to this invention to provide liner assemblies which very accurately fit over such tubs and against finished bathroom walls. Thus, minor calking may be all that is required of the installer. Liner assembly 24 includes an upturned flange 32 similar to flange 17 which abuts lathing, plaster, and tile 14, may be sealed thereto by such calking.

Bathtube liner assembly 24 is preferably made from sheet steel which is coated with porcelain enamel. A 14 or 16 gage sheet is a desirable thickness. Porcelain enamel coatings are preferably at least .007 inch thick to supply a durable, glossy, abrasionand chemical-resistant surface. Other materials may be used, such as stainless steel or molded plastics or the like, but these are not considered desirable. Of course, every dimension of liner assembly 24 may be easily varied in order to accommodate varying bathtub sizes and shapes.

The liner assembly 24 may be formed so as to have sufficient rigidity to be supported solely from ledge 16. However, for economy and lightness of weight, it is desirable to use a relatively thin liner, which may yield under the weight of water ad a person in the tub. Where this is deemed a disadvantage a filler material 29 such as perlite or other inert granules may be introduced between tub portions 25 and 15 until substantially all voids therebetween are filled at least for the bottom and parts of the sides of the space between tub portions 15 and 25. Filler material 29 is selected to include favorable non-combustible, sound-insulating and vermin-resistant properties. If desired, a liquid or viscouse material which sets into a solid form, such as epoxy-containing material, may be used.

After covering tub 10 with liner assembly 24 and after adding filler material 29, new drain and overflow holes 31 and 30 are connected to the existing waste plumbing system. In a preferred method of installation, the existing drain and overflow fittings which connect the existing bathtub 10 to the Waste plumbing system of a house, for example, are removed prior to insertion of liner assembly 24. These fittings ordinarily include a flanged cylindrical sleeve (not shown), in the case of the drain opening, with its flange seated within a depression 60 formed around hole 18 and its sleeve extending into threaded engagement with internal threads of a pipe 34, forming part of the T-junction leading to trap 21. This existing sleeve is unscrewed and removed. A new cylindrical drain sleeve 35 similar in shape to that removed is supplied as in FIG. 5. It includes an annular flange portion 36 at one end and external threads 37 formed at its opposite end. The underside of flange portion 36 is coated with a plumbing sealing compound and sleeve 35 is threaded into threads 33. Fluid is thereby prevented from entering the voids between tub portions 25 and 15 occupied by filler material 29. Sleeve 35 may be of the type removed with an identical or longer overall length which will facilitate bridging the distance between holes 31 and 18.

Illustrative interconnections of overflow pipe 20 with overflow hole 30 are shown in FIGS. 4 and 6. It is conventional for the overflow pipe 20 to be held in place by a T-bar having a cross-bar held in a groove or recesses in the inner wall of the overflow pipe, and having an axialrod-portion passing through a perforated escutcheon plate within the tub and secured thereto by a nut threaded on the end. This is removed and a new T-shaped tie rod 41 is inserted with a T portion 42 supported within groove or recess 40 in pipe 20. A leg portion 43 extends integrally from T portion 42 through holes 19 and 30 and into the hollow of tub portion 25. Leg portion 43 is formed with external threads 44 at its free end.

In a preferred embodiment shown in FIG. 6-, a cylindrical flanged sleeve 45 having an annular flange 46 ex tends coaxially with respect to leg portion 43 through holes 30 and 19 such that flange 46 abuts the surface of tub portion 25 immediately surrounding hole 30. Sealing compound may be added between flange 46 and the tub. A perforated escutcheon or ornamental plate 47 having a curved crosssectional shape is located with its peripheral edges in contact with and compressing flange 46 against tub portion 25. A locking nut 48 is threaded onto threads 44 and maintains the assembly as shown in FIG. 6. Tightening of nut 48 causes a pulling of tub portion 25 and overflow pipe closer together, thus forming a tight joint therebetween. An optional O-ring type gasket 49 is located and compressed between the free end of pipe 20 and outer surfaces of tub portion 15. Gasket 49 further insures against leakage of fluid into the voids occupied by filler material 29. Liquid in tub portion reaching escutcheon 47 is free to flow due to gravity therethrough, thereafter through sleeve and into pipe 20, such that liner assembly 24 will not overflow.

In another embodiment of the invention, shown in FIG. 4, sleeve 45 is eliminated and a sealing ring or loose sealing compound 50 is compressed between tub portions 25 and 15 by tightening locking nut 48. Sealing ring 50 prevents fluid from entering the spaces between the tub and liner. It will also be understood that similar liner assemblies may be used for refurbishing other household plumbing fixtures, such as sinks, toilets, bidets and the like.

The liner assembly 24 covering the bathtub 10, as insalled, provides a new bathing container of any desired color with but a minor reduction in bathtub hollow volume, as compared with bathtub 10. The refurbishing just described may be effected with a few hours of labor with but a fraction of the inconvenience and cost presently experienced by removing and replacing an existing tub.

The embodiments of the invention particularly disclosed are presented merely as examples of the invention. Other embodiments, forms and modifications of the invention coming within the proper scope of the appended claims, will, of course, readily suggest themselves to those skilled in the art.

What is claimed:

1. A method of refurbishing an existing conventional bathtub having a substantially horizontal peripheral circumscribing ledge portion connected to conventional existing plumbing, comprising the steps of supporting portions of a liner assembly comprising a liner having a ledge portion corresponding to said bathtub ledge portion and including an external vertical extension on and within the entire existing bathtub direct bearing contact between said bathtub and said liner being made only between the bottom of said liner ledge and the top of said bathtub ledge, thereby forming new liquid-containing surfaces and obscuring the entire existing container from view, and interconnecting portions of said liner assembly adjacent said existing plumbing with said existing plumbing.

2. A method as in claim 11, where said existing tub has a liquid outlet, and said liner assembly has a corresponding aperture, comprising the further steps of positioning said liner assembly with its aperture in substantial register with said outlet, said interconnecting step including interconnecting said outlet and aperture with a liquidconveying channel and sealing said channel to said aperture.

3. A method of refurbishing according to claim 1, wherein said bathtub includes substantially horizontal ledge surfaces, said step of supporting including supporting the weight of said liner assembly on said ledge surfaces.

4. A method of refurbishing according to claim 1, wherein said step of interconnecting comprises removing at least one first conduit member interconnecting said existing bathtub and portions of said plumbing and installing at least one second conduit member between said liner assembly portions and said plumbing portions.

5. A method as in claim 3, including the step of at least partially filling the space between said existing bathtub and liner assembly with a granular material.

6. A refurbished conventional bathtub for use with a conventional household-type plumbing system, comprising a first container including substantially horizontal first ledge portions, and a first tub portion connected to said ledge portions; a second container supported by said first container, including a second tub portion disposed within the cavity of said first tub portion, and second ledge portions integral with said second tub portion having lower bearing surfaces on the undersides of said second ledge portions, sole direct contact between said first and second containers occurring between said lower bearing surfaces and said first ledge portions; and said second tub portion being formed to accept means interconnecting said second container with said plumbing system.

7. A liquid container according to claim 6, wherein said second tub portion is formed with a drain hole, said interconnecting means including a first flanged sleeve extending through said drain hole and through said first tub portion into engagement with a portion of said plumbing system.

8. A liquid container according to claim 6, wherein said second tub portion is formed with an overflow hole and said interconnecting means further includes a perforated escutcheon covering saidl overflow hole, and a tie rod supported at one end by a recessed portion of said plumbing system and at its opposite end by said escutcheon, said tie rod extending through said first tub portion and through said overflow hole.

9. A liquid container according to claim 8, wherein said interconnecting means further includes a flanged flanged sleeve having a cylindrical portion extending substantially coaxially with said tie rod through said first tub portion and said overflow hole, said second flanged sleeve including a flange portion disposed between the periphery of said escutcheon and portions of said second tub portion surrounding said overflow hole.

10. A liquid container according to claim 8, wherein said interconnecting means includes a seal ring compressed between said first and second tub portions around said overflow hole for conducting fluids between said first and second tub portions.

11. A liquid container according to claim 6, further comprising a particulate filler material occupying at least part of the space between said first and second tub portions.

12. A liquid container according to claim 11, wherein said filler material is perlite.

References Cited UNITED STATES PATENTS 938,102 10/1909 Wise 4191 D. 143,767 2/1946 Stanitz 4--173 1,445,101 2/1923 Niedeeken 4199 1,919,354 7/1933 Anderson 4173 UX 2,080,601 5/1937 Cappuccio 4173 2,468,347 4/1949 Restall 4-173 2,919,449 1/1960 Bowden 4-173 3,045,254 7/1962 Cook et al 4173 3,065,473 11/1962 Sporck et al. 4166 FOREIGN PATENTS 27,572 6/1914 Great Britain 4166 376,981 7/1932 Great Britain 4--173 366.353 7/1906 France 4166 LAVERNE D. GEIGER, Primary Examiner D. B. MASSENBERG. Assistant Examiner

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4067071 *Jun 10, 1976Jan 10, 1978Thermasol Ltd.Bathtub, wall and ceiling liner assembly
US4069523 *Dec 23, 1974Jan 24, 1978Ridgeway Louis HBathtub with cushioned liner of foam plastic
US4145772 *Jul 11, 1977Mar 27, 1979Trayco, Inc.Plastic toilet
US4158585 *Feb 2, 1977Jun 19, 1979Wright Melvin AWashbasin liner method and article
US4267609 *Dec 18, 1978May 19, 1981Thermasol Ltd.Gasket assembly for coupling drainage outlet openings in bathtub liner installations
US4750967 *Aug 13, 1986Jun 14, 1988Kott John TIn-situ
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US5661857 *Jul 31, 1995Sep 2, 1997Mclean; Vernon WalterWash basin repair by a molded insert
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US5814270 *Mar 19, 1996Sep 29, 1998Luxury Bath Liners, Inc.Apparatus and method for the formation of a bathtub or shower stall liner
US6319546Aug 12, 1999Nov 20, 2001Steven R. CovenHand spreadable surface coating for bathtubs and the like and method for its application
US6516531Aug 29, 2001Feb 11, 2003Gerhard WoerleinMethod of installing a bathtub and a template therefor
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US20100223777 *Mar 8, 2010Sep 9, 2010Callie Jeffrey KincaidMethod of installing a bathtub liner using a liquid adhesive
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EP0315095A1 *Oct 29, 1988May 10, 1989Sanibad-Held AgBath-tub for the replacement of an older, already built-in bath-tub
EP0370918A2 *Nov 24, 1989May 30, 1990Michel Paul Ghislain GigonMethod for manufacturing articles by synthetic-concrete casting between two shells of which one is obtained by thermal shaping
EP0697272A2 *Jul 12, 1995Feb 21, 1996FRANZ KALDEWEI GMBH & CO.Method and apparatus for making composite bathtubs
EP1635684A1 *Jun 25, 2003Mar 22, 2006Kenny Roberts, Jr.Sanitary fixture proxy
WO1999034717A1 *Dec 28, 1998Jul 15, 1999Navarro Torres AlfonsoCoating for used and deteriorated bath tubs and installation process
U.S. Classification4/580
International ClassificationA47K3/00, B29C70/00, B29C70/84
Cooperative ClassificationA47K3/001, B29C70/84
European ClassificationA47K3/00B, B29C70/84