Device for bending conical wires
Patent 4918958 Issued on April 24, 1990. Estimated Expiration Date: 
April 24, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 24, 2007. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3640112 3859830 Apparatus for forming circularly bent articles from a straight metal profiled strip Pipe bending machine Patent #: 4412438 InventorsAssigneeApplicationNo. 005163 filed on 12/05/1986US Classes:72/12.7, Sensing cross sectional dimension72/135, To form helical coil or tube72/175Comprising rectilinearly reciprocable carrier for elementExaminersPrimary: Crane, Daniel C.Attorney, Agent or FirmForeign Patent References
International ClassesB21D 007/08B21B 037/02 Foreign Application Priority Data1985-02-20 DEAbstractThe 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. | |
