The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 18, 1976
Filed:
Dec. 03, 1973
Applicant:
Inventor:
Herbert Rahlfs, Troisdorf-Sieglar, DT;
Assignee:
Reifenhauser KG, Troisdorf, DT;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B29F / ;
U.S. Cl.
CPC ...
156500 ; 156244 ; 264 95 ; 264172 ; 264173 ; 2641 / ; 425114 ; 4251331 ;
Abstract
Several thermoplastic tubes to be bonded to one another are jointly extruded through concentric annular orifices while cool air is blown from annular Venturi nozzles in concentric streams past the outer surface of the outermost tube and past the inner surface of the innermost tube to accelerate their solidification. The inter-tube space or spaces can be inflated by similar air streams blown at least in part along their confronting tube surfaces. The return of the injected air from the innermost and inter-tube spaces takes place through conduits disposed midway between the nozzles.