Method of connecting a stack of laminations for electric motors
Patent 4979285 Issued on December 25, 1990. Estimated Expiration Date: 
July 20, 2010. 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.
July 20, 2010. 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 2254589 2975312 3202851 Apparatus for laminated core manufacture Method and apparatus for joining plates by stamping pressing and swaging dies Patent #: 4760632 InventorApplicationNo. 555109 filed on 07/20/1990US Classes:29/598, Rotor29/522.1, Radially expanding part in cavity, aperture, or hollow body29/609, Laminated29/736, Including deforming means29/738Laminated deviceExaminersPrimary: Hall, Carl E.Attorney, Agent or FirmInternational ClassH02K 015/02AbstractA method of retaining a series of plates together in a stacked relationship, using integral projections and mating recesses formed by punching dies. As each plate is added to the stack, a restriking die is driven against the exposed face of the newly added plate to form transverse notches in the plate surface. The plate is thus deformed so that material flows into previously formed notches in a subjacent plate. The displaced material acts as a frictional interlock with the subjacent plate. | |
