(19)
(11) EP 0 293 101 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
13.12.1989 Bulletin 1989/50

(43) Date of publication A2:
30.11.1988 Bulletin 1988/48

(21) Application number: 88304090.9

(22) Date of filing: 06.05.1988
(51) International Patent Classification (IPC)4: B21D 31/02, B21D 39/04, F16B 7/18
(84) Designated Contracting States:
BE CH DE ES FR GB IT LI NL SE

(30) Priority: 06.05.1987 GB 8710650

(71) Applicant: FLOWDRILLING LIMITED
Chestergate Stockport SK3 ORD (GB)

(72) Inventors:
  • Walker, Robert
    Cheadle Hulme, Cheshire (GB)
  • Overy, Keith Harry
    Pullax-Hill Bedfordshire (GB)
  • Fogg, Paul
    Congleton, Cheshire (GB)

(74) Representative: Barker, Rosemary Anne (GB) et al
43 Aldwyn Crescent Hazel Grove
GB-Stockport SK7 5HU
GB-Stockport SK7 5HU (GB)


(56) References cited: : 
   
       


    (54) A method of making an angled joint


    (57) A method of making a rigid angled joint between a first length (12) of metal tubing and a second length (18) comprises the steps of first applying a rotating piercing tool (not shown) under pressure, to the first tube's wall. The tool thus forms a hole (14) surrounded by an integral bush (16) which is formed from the displaced tube wall material, is at an angle to the axis of the tube (12) and has a diameter to closely fit the external diameter of the second tube (18). The second tube (18) is inserted through the bush (16) into the interior of the first tube (12) and is secured therein by, preferably a bolt or screw (not shown) extending through a second smaller concentric hole (26) and locating in threaded extension (22) of the second tube (18).







    Search report