Title: Method of making Belleville springs

Abstract: A washer-type spring, commonly called a Belleville spring, which has an improved fatigue life and residual compressive stresses resulting from the creation of a carbon gradient through the spring thickness. This improved spring is formed from a plain carbon or low alloy steel which, after blanking, cutting and forming, is heated to a temperature above the austenitizing temperature in a carbon-rich atmosphere, held at this temperature until suitably carburized, and then quenched.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Schober, Michael A. (Palatine, IL, US)

Application Number: 669063
Filing Date: 1976-03-22
Publication_date: 1977-08-02
Assignee: Borg-Warner Corporation (Chicago, IL)
Primary Class(es): 148/226 148/233, 148/319, 148/908, 267/161
Other Classes:
US Patent Ref:

1074114	Sep, 1913	Giolitti	148/16.
1817407	Aug, 1931	Brower	148/16.
2299138	Oct, 1942	Gier	148/16.
2458655	Jan, 1949	Sowa	148/14.
2513713	Jul, 1950	Cope	148/16.
2952453	Sep, 1960	Haussermann	267/161.
2955062	Oct, 1960	Cullen et al.	148/16.
3078192	Feb, 1963	Ahrens	148/16.
3228807	Jan, 1966	Mitchell et al.	148/12.
3230118	Jan, 1966	Tufts	148/12.
3259383	Jul, 1966	Johnson et al.	267/161.
3278349	Oct, 1966	Hoseby et al.	148/131.
3345220	Oct, 1967	Haynes	148/148.
3356541	Dec, 1967	Cullen	148/16.
3668917	Jun, 1972	Komatsu et al.	148/12.
3774896	Nov, 1973	Rode	267/161.
3891474	Jun, 1975	Grange	148/16.
3901739	Aug, 1975	Mandoki	148/12.
3964737	Jun, 1976	Schober	267/161.

Other Refs:
Primary Examiner: Satterfield, Walter R.
Assistant Examiner:
Attorney: Geppert; James A.