Pipe jointing

US4174996A · kind A · utility

Inventor

• John Hunter · Cambridge, US

Key dates

• Filing date: Dec 21, 1977
• Grant date: Nov 20, 1979
• Expiry date: Dec 21, 1997

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29C66/91421
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Apparatus for jointing together by socket fusion two plastics pipe lengths, or one plastics pipe length and a plastics fitting comprises PA1 a frame; PA1 first and second ring clamps each slidably mounted on said frame so as to be movable towards or away from one another; PA1 means to effect movement of said clamps relatively towards and away from one another; PA1 said first clamp being dimensioned to clamp one end of a first pipe length and squeeze said end into a circular shape; PA1 said second clamp being dimensioned to clamp a fitting, or a socket end of a second spigot and socket pipe length, and said second clamp including a plurality of arcuate bearing shoes each operable on by one of a plurality of screw adjusters carried by said second clamp, said bearing shoes together being adapted to make circumferential contact over substantially the whole of the periphery of said fitting or said socket end, said screw adjusters being adjustable to cause axial alignment of said fitting with respect to said end of said first pipe length, or of said socket end with respect to said end of said first pipe length; and PA1 a heating means for bringing surfaces to be fused together to fusion …