A pipe fitting of expandable plastic material for joining plastic pipes as used in the manufacture of P.V.C. furniture with fittings and the fastening device being molded together as one unit.

BACKGROUND OF THE INVENTION 
An entire industry has grown around the manufacture of furniture from 
sections and pieces of P.V.C. pipe and fittings. Overall such furniture 
looks good to the eye but the pipe to pipe joints detract from it's 
beauty. Heretofore, P.V.C. furniture has been fabricated using both 
standard and special design slip fittings that have the look of ordinary 
plumbing. 
P.V.C. fittings are being made that are applied to the outer wall of a 
receiving pipe; such fittings are know to the trade as `saddle` type. 
Heretofore, the methods used to fasten said fittings to a pipe componant 
have been found lacking in many ways. One method is the application of any 
ordinary nut and bolt; bolt is inserted thru center of said fitting and 
into a drilled hole of receiving pipe componant. The `saddle` end fits 
snug against pipe wall and is drawn tight after a nut is applied from 
inside of said pipe. The nut must be held manually to prevent turning 
while bolt is being tightened. It is evident that this method is possible 
only at open ends of a receiving pipe where the nut can be held. Fastening 
of said fitting away from an open end requires an access hole be drilled 
thru other side of receiving pipe so that the nut can be applied and 
tightened. A plastic plug is then inserted into the said access hole for 
cosmetic appearance. An other method uses a "U" clip pushed under a bolt 
head to hold said fitting in place. Manual application from inside of 
receiving pipe is again required, thus limiting the use to pipe ends. 
Other means used require the fastening bolt be inserted completely thru 
the receiving pipe and the fitting being attached. This method leaves the 
bolt head exposed and unsightly. 
SUMMARY OF THE INVENTION 
In an effort to produce neat joints that go together quickly and easily the 
instant invention utilizes the flexibility and expanding properties of the 
P.V.C. material of which the fitting units are fabricated, i.e. 
(polyvinylchloride). Accordingly several objects of my invention are as 
follows: 
It is an object of the instant invention to provide a quick and easy 
fastening device and operation for the joining of multiple pipe ends, made 
of a plastic such as P.V.C, for use other than the transport of liquids. 
It is a further object of the instant invention to modify any type or size 
plastic `saddle` style fittings so that said fitting and the fastening 
device or means are molded together as one unit when said fitting is 
manufactured. 
It is still a further object of the instant invention to join multiple pipe 
ends at any distance from an open and distal end. 
It is still a further object of the instant invention to join multiple pipe 
ends without requiring any parts to be held or tightened from the inside 
of any such joint. 
It is still a further object of the instant invention that pipes of one 
dimmension can be fastened to each other. 
It is still a further object of the instant invention that a pipe of one 
O.D. can be fastened to a pipe of larger O.D. 
It is still a further object of the instant invention that any variable 
thickness of the receiving pipe wall will not effect application of said 
invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT 
FIG. 1 is designated as "Prior Art" and is made and used by the trade for 
pipe to pipe installation. Said prior art is known as a `saddle` type 
fitting. 
FIG. 2 is the basic fitting as shown in FIG. 1 with the addition of the 
improvement marked section 1. 
FIG. 3 shows the addition of the invention section 1 as it is molded into 
the basic unit 1A. Said section 1 being a circular nipple segmented 
lengthwise into six equal parts 2. Each segment 2 is independent of the 
other. The open end of said segmented nipple 1 has a recessed socket 
section 2A. Said socket 2A is molded in the shape of a hex head acorn nut 
3. Directly below section 2A is a hemi-spherical recess 2B. The 
combination of 2A and 2B complements exactly the shape and size of the 
functional means or acorn nut being used. 
In FIG. 4 looking down into the open end of segmented nipple 1 each 
separate segment 2 can be seen. The hex socket 2A is outlined along with 
recess 2B, bolt hole 4 is shown at center. 
In FIG. 5 the componant parts are shown in proper order before assembly. In 
the assembly a hole or aperture 8 is provided in a receiving pipe 9; said 
hole provides a slip fit for insertion of assembled section 1. Wedge or 
acorn nut 3 is set into socket 2A. The function of the wedge nut is to 
exert pressure on the interior wall of section 1 and thereby expand the 
segments 2. Said socket 2A being the same shape as the wedge nut 3 will 
prevent the said nut 3 from turning. Bolt 5 is inserted into hole 4 and 
threaded into wedge nut 3 until said nut 3 bottoms out with pressure. 
Assembled section 1 is inserted into hole 8 of receiving pipe 9. Torque is 
applied to head of bolt 5 which is drawn up tight. As bolt 5 is tightened 
the wedge nut 3 slides up wall 4 thereby spreading and expanding the 
segments 2 of section 1 apart. Said segments 2 lock behind inner wall of 
receiving pipe 9. 
FIG. 6 shows an interior view of a piece of pipe with the invention 
completely installed. The wedge nut 3 has spread the segments 2 of section 
1 apart. Said segments being fully locked behind inner wall of pipe 9. 
While the above description contains many specifities, these should not be 
construed as limitations on the scope of the invention, but rather as an 
exemplification of one preferred embodiment thereof. Many other variations 
are possible, for example; wedge means can be any conical shaped unit 
having opposing edges, fins, or protrusions that will engage into a 
fissure of compatable shape. The said fissure being the inner wall of 
expanding nipple 1. Said conical means can be formed as the head of bolt 
5. Said bolt 5 would then be inserted from open end of section 1; a 
standard nut being applied on bolt 5 from open end of nipple 6 of unit 1A. 
Another arrangement is to have the inner wall of the nipple section 1 
formed square to provide a socket for a special bolt 5. The special bolt 5 
in this application would be classified as a `counter sunk carriage bolt`; 
the taper section of such a bolt would act as the wedge, the square 
section under the taper would lock into the matching square center of the 
nipple section 1. 
Accordingly the scope of the invention should be determined not by the 
embodiment illustrated, but by the appended claims and their legal 
equivalents. Therefore,