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:
Aug. 06, 1991
Filed:
Aug. 15, 1989
Applicant:
Inventor:
Bruno Hilpert, Diessenhofen, CH;
Assignee:
Georg Fischer AG, Schaffhausen, CH;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29C / ;
U.S. Cl.
CPC ...
156503 ; 156158 ; 1563042 ; 1563046 ; 156502 ; 1565834 ; 219535 ;
Abstract
A heating arrangement (2) embracing tubular parts (1a, 1b) of plastic material which have to be joined by welding, comprises electrically heatable jaws (26). A bladder (50) expandable by compressed air is arranged inside the tubular parts (1a, b), which includes a centrally arranged tensile part (56) such as, for instance, cable for the purpose of limiting the length. The air pressure in the bladder is higher than the pressure generated by the material when melting, this for the purpose of producing an adequate welding pressure.