Abstract An apparatus for preparing a synthetic pipe for use in a float is disclosed. A first pipe is extruded by the use of a first extruding means and separating plates are inserted and fixed in the pipe in a tight manner at predetermined, intervals in order to form chambers within the pipe. While the pipe is still heated and in a soft state from the extrusion, a perforating means perforates the wall of the first pipe, between the plates thus forming a communication between the atmosphere and the chamber. This eliminates the deformation of the pipe which would be caused if the chamber were sealed from the atmosphere. After the pipe has cooled, a second pipe is extruded around the first pipe in contact therewith in order to cover the first pipe and thus cover the perforations. In this manner, a closed pipe is formed which is suitable for use as a float. The insertion of the separating plates is conducted in such a manner that a ridge is formed at the point of insertion. This is the finished pipe, a plurality of circumferential ridges at predetermined lengths giving an appearance similar to bamboo.
An apparatus for forming a synthetic pipe with separating plate therein said apparatus comprising a. first extruding means for extruding a first pipe; b. insertion means for inserting said plates into sAid pipe at predetermined intervals therein; c. perforation means for perforating the wall of said first pipe between said separation plates said perforation means being positioned such that said perforation is made while said first pipe is still heated and soft from the extrusion thereof; d. second extrusion means for extruding a second pipe over said first pipe and in contact therewith whereby said perforations are covered and said synthetic pipe is formed thereby.
Claim 2
Independent Claim
105 words
An apparatus for forming a synthetic pipe with separating plate therein said apparatus comprising a. first extruding means for extruding a first pipe; b. insertion means for inserting said plates into sAid pipe at predetermined intervals therein; c. perforation means for perforating the wall of said first pipe between said separation plates said perforation means being positioned such that said perforation is made while said first pipe is still heated and soft from the extrusion thereof; d. second extrusion means for extruding a second pipe over said first pipe and in contact therewith whereby said perforations are covered and said synthetic pipe is formed thereby.
Claim 3
Dependent Claim
30 words
The apparatus of claim 1 wherein said perforation means comprises a pin and means for forcing said pin through the wall of said first pipe and then removing it therefrom.