Method for securing winding bars in slots of electric generators

{
  "publication_number": "US3909931A",
  "country": "US",
  "kind": "A",
  "title": "Method for securing winding bars in slots of electric generators",
  "abstract": "Means to secure winding bars in slots of electric machines. A spring is mounted under a wedge in the slot. The spring is in the form of a corrugated leaf spring corrugated in a direction so that the corrugations extend transversely of the longitudinal length of the leaf spring. The spring has a spring characteristic selected such that the spring, when installed in the slot, can be compressed at least 80% of its expanded state, and the spring pressure or biasing force is always higher than the total pulsating or changing bar pressure.",
  "claims": [
    "1. Method for securing a winding bar in a slot of an electric machine, said slot being adapted to receive a wedge comprising the steps of: inserting a corrugated spring in said slot on top of said bar, said spring extending in the longitudinal direction of the slot, inserting a pressure member on top of said spring, and applying tensioning force to said spring, solely by inserting a wedge into said slot in said longitudinal direction, said spring having a spring characteristic which is linear up to 70% of the maximum expanded state of the spring, said spring being compressed solely through the insertion of the slot closing wedge to at least 80% of its expanded state."
  ],
  "cpc": [
    "H02K 3/48",
    "Y10T 29/49009",
    "Y10T 29/49863"
  ],
  "assignees": [
    "KRAFTWERK UNION AG"
  ],
  "filing_date": "1974-05-23",
  "publication_date": "1975-10-07",
  "grant_date": "1975-10-07",
  "priority_date": "1972-12-29",
  "application_number": "US-47264274-A",
  "family_id": "26981954",
  "citations": [
    "US2922058A",
    "US3009073A",
    "US3243622A",
    "US3444407A",
    "US3780325A"
  ]
}