Apparatus for forming circularly bent articles from a straight metal profiled strip
Pipe bending machine Patent #: 4412438
ApplicationNo. 005163 filed on 12/05/1986
US Classes:72/12.7, Sensing cross sectional dimension72/135, To form helical coil or tube72/175Comprising rectilinearly reciprocable carrier for element
ExaminersPrimary: Crane, Daniel C.
Attorney, Agent or Firm
Foreign Patent References
International ClassesB21D 007/08
Foreign Application Priority Data1985-02-20 DE
AbstractThe invention relates to a bending apparatus for wires having a cross section which varies according to their lengths, and comprising two cylindrical sections and an interleaved conical section. The wire is bent by means of three rollers. The bending roller is mounted on a carriage and determines the bending degree imparted to the fed wire. The wire is bent despite its variable diameter so that it is deposited with a regular curvature on the reception plate. To this effect, the curvature of the conical section is changed between the correct curvature of the thinner cylindrical section of the wire and that of the thicker cylindrical section of the wire. It only requires a simple switching at an appropriate time to obtain a sire bobbin which may be deposited on the reception plate. The appropriate switching time is situated between 20% and 60%, but preferably between 30% and 40%, and is calculated from the beginning of the wire diameter increase.