BACKGROUND OF THE INVENTION

(1) Summary of the Invention

The present invention relates to an improved plastic coupling which is secured in place in a cored or drilled hole in a concrete floor or wall. In particular, the present invention relates to an improved coupling which is secured in place in the hole by a plasti to concrete adhesive.

(2) Prior Art The prior art has described cast-in-place plastic couplings for use in building' construction . These are particularly shown in U.S. Patent Nos . 4,261,598 to Cornwall and 4,453,354 and 4,313,286 to Harbeke. These couplings have projections or ridges on the outside which hold the coupling in place. Fluid concrete is poured around the coupling and then the concrete is allowed to set to form a floor or a wall supporting the coupling. Th resulting cast-in-place coupling provides a very good conduit between pipes mounted in the coupling on either side of the floor or wall.

The problem faced by the prior art is that during construction of a building after the wall or floor has been poured and set, a need arises for a coupling mounted through the concrete floor or wall which can function like the cast-in-place coupling. A cast-in-place coupling can be secured in place by providing a large _.. opening in the wall or floor where concrete is then

re-poured as a patch around the coupling. The problem is that the coupling and/or patch can work loose. The prior art has not provided an effective means for securing a plastic coupling through a pre-formed floor or wall in a building. OBJECTS

It is therefore an object of the present invention to provide an improved plastic coupling which c be inserted into a cored or drilled hole in a concrete floor or wall in an interference fit and secured in place using a concrete to plastic adhesive. Further it is an object of the present invention to provide a coupling whi provides a leak free seal between the outside of the coupling and a cored or drilled opening in the concrete. Further still, it is an object of the present invention- t provide a coupling and method for installing the coupling which is simple and economical to use. Further still, it is an object of the present invention to provide a buildi construction using the improved coupling. These and othe objects will become increasingly apparent by reference to the following description and the drawings. IN THE DRAWINGS

Figure 1 shows the improved coupling 10 which i in position for insertion into a cored opening 101 in a concrete floor or wall 100.

Figure 2 shows a firestop stack fitting 200 mounted in place in the improved coupling 10.

Figure 3 shows the improved coupling 10 mounte in the cored opening 101 in the floor 100 so as to provid a means for mounting pipes 102 and 103 in position in the coupling 10 by means of flexible connectors 104 and 105.

Figure 4 shows the improved coupling 10 with a pipe 106 supported in place by locating and holding rings 107 and 108. .

GENERAL DESCRIPTION

The present invention relates to an integral plastic coupling for plastic pipe and adapted to be mount in a cored or drilled hole in a concrete floor or wall defined by spaced apart planar surfaces which comprises: tube with opposed openings having spaced apart inne and outer cylindrical surfaces around a central longitudinal axis of the tube, wherein the inner surface has a first diameter equal to an outside diameter of standard plastic pipe and wherein the outer surface has a second diameter slightly smaller than the cored or drilled hole in the wa or floor so as to have an interference fit in the hole; a a flange around one of the openings in the tube adapted t be secured by a plastic to concrete adhesive to one of th spaced apart planar surfaces of the floor or wall.

Further the present invention relates to a building construction which comprises: an integral plasti coupling for plastic pipe and mounted in a cored or drill hole in a concrete floor or wall defined by spaced apart planar surfaces which comprises a tube with opposed openings having spaced apart inner and outer cylindrical surfaces around a central longitudinal axis of the tube, wherein the inner surface has a first diameter equal to an outside diameter of standard plastic pipe and wherein the outer surface has a second diameter slightly smaller than cored or drilled hole in the wall or floor to fit in an interference fit, a flange around one of the openings in the tube adapted to be secured by an adhesive to one of th spaced apart planar surfaces of the floor or wall; plastic pipe mounted in the openings of the coupling and solvent welded to the inner surface of the coupling so as to form continuous conduit; and a concrete to plastic adhesive securing the coupling in the cored or drilled opening in-- the concrete floor or wall. Finally the present invention relates to a method for mounting a coupling in a concrete wall or floor which comprises: providing an integral plastic coupling fo

plastic pipe and adapted to be mounted in a cored or drilled hole in a concrete floor or wall defined by space apart planar surfaces which comprises a tube with opposed openings having spaced apart inner and outer cylindrical surfaces around a central longitudinal axis of the tube, wherein the inner surface has a first diameter equal to outside diameter of standard plastic pipe and wherein the outer surface has a second diameter slightly smaller than cored or drilled hole in the wall or floor to fit in an interference fit, a flange around one of the openings in the tube adapted to be secured by an adhesive to one of t spaced apart planar surfaces of the floor or wall; drilli or coring the hole in the concrete floor or wall; and pre fitting the coupling into the hole in the wall or floor with an adhesive on the flange securing the flange to one floor surface of the wall or floor.

The prior art has developed diamond tipped too for drilling or coring very precise holes in concrete. T equipment is available from Diamond Products, Inc., Ohio, for instance. The result is a very uniform, cylindricall shaped hole in the floor or wall of a building.

The holes preferably have unitary diameters (1 2, 3 etc. inches). The coupling is between 0.01 to 0.003 inch undersized. τhe prior art has also recently developed adhesives which will permanently bond concrete to plastic used in plastic piping, particularly ABS and PVC. The result is a plastic to concrete bond which results in destruction of the plastic before the bond breaks. These adhesives are flexible, water resistant, smoke resistant and of the mastic adhesive class and are available from 3 in Mineapolis, Minnesota. This type of adhesive is important to sliding and securing the coupling in place -i the hole and is necessary to also provide a permanent sea around the outside of the improved coupling.

The improved coupling has a flange which mates with an upper or lower surface of the floor or wall. The

adhesive is provided on an underside of the flange adjace the tube forming the body of the coupling to provide the bond between the concrete and the improved coupling when i is inserted in the hole. Preferably the flange has openings which are filled with the adhesive when the coupling is inserted into the cored opening. This preven any rotation of the coupling in the cored opening after th adhesive cures. It primarily makes the joint waterproof and smokeproof. SPECIFIC DESCRIPTION

Figure 1 shows a coupling 10 which is about to be pressed into an interference fit in opening 101 in concrete floor or wall 100. A fluid adhesive bead 11 is provided around the coupling 10 which includes the tube 10 forming a body and flange 10b. The tube 10a has an interference fit with opening 101. The flange 10b has openings 10c so that the adhesive 11 extrudes through the openings 10c when the coupling 10 is pressed in place in the opening 101. Figure 2 shows a fire stack fitting 200 such as shown in U.S. Patent No. 4,638,829 by the inventor. The coupling 10 supports a iron sleeve 201 and plastic insert 202 which is solvent welded to the tube 10a. A flexible connector 104 (U.S. Patent No. 4,420,176), as is known to those skilled in the art, holds a pipe 102 in place in a main conduit 200a and is secured by a clamp 202. The fire stack fitting 200 includes a non-flammable (iron) plug 203 mounted in an extension 200b of the main conduit 200a whic is held in place by a harness 204. The extension 200b includes a cover 205 which covers an opening 206 which allows the plug 203 and harness 204 to be positioned in th extension 200b and then closed. A clamp 207 secures the cover 205 in place. The plug 203 is released into the sleeve 201 in the event of a fire below the floor 100 as shown in Figure 1.

Figure 3 shows flexible connectors 104 and 105 mounted inside the tube 10a of coupling 10. The connector

104 and 105 are solvent welded to the inside of the tube 10a of the coupling 10. A plastic insert lOd is solvent welded inside the coupling 10. Connectors 104 and 105 are secured by clamps 109 and 110 to pipes 102 and 103. Figure 4 shows the coupling 10 with a pipe 106 along axis a-a and with locating and holding elastic rings 107 and 108 which hold the pipe 106 in place. A fireproof filler 111 is packed between tne outside of pipe 106 and rings 107 and 108. Thus Figures 2 to 4 show various uses for the improved coupling. Numerous variations will occur to thos skilled in the art. For instance, the pipes 102 and 103 can be secured directly to the coupling 10 by solvent welding in the manner of U.S. Patent No. 4,261,598 to Cornwall.

It is intended that the foregoing description b only illustrative of the present invention and that the invention be limited only by the hereinafter appended claims.