Daniel E Johnson
Electrician at Winewood, Arlington, TX
License number
Colorado 679
Issued Date
Oct 24, 1959
Renew Date
Feb 28, 1989
Expiration Date
Feb 28, 1989
Type
Master Electrician
Address
Address
2007 Winewood Ln, Arlington, TX 76013
Professional information
Fatigue And Damage Tolerant Coil Spring
US Patent:
6811149, Nov 2, 2004
Filed:
Oct 27, 2003
Appl. No.:
10/694281
Inventors:
Daniel E. Johnson - Arlington TX 76006
International Classification:
F16F 106
US Classification:
267167, 29 907
Abstract:
Predetermined non-uniform residual compressive stress distributions are induced in the spring wire of metallic coil springs. The residual compressive stress tends to reduce deleterious effects of both fatigue and coil binding impacts on spring performance. Transverse cross-sections of coil spring wire reveal non-uniform distributions of residual compressive stress that exhibit substantial symmetry about various transverse axes, including axes connecting potential or actual opposing coil binding contact points on the spring wire surface. Residual compressive stress in coil spring wire of the present invention may also vary in a predetermined manner when measured longitudinally along the coil spring wire.