Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Patent
1994-07-07
1995-02-28
Phillips, Michael W.
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
361679, 361681, 16386, 439165, 174136, 29433, H05K 702, E05D 514, H01R 300, H01B 724
Patent
active
053942973
ABSTRACT:
A rotatable bushing for reducing bending fatigue on a flat cable between a display screen cover and a base of a portable computer comprises an elongate cylindrical body having a diametric slot therethrough. The bushing is positioned along the hinge axis between the cover and the base of the portable computer. The cable extends from the cover display screen, through the slot, and to circuitry within the base of the computer. MYLAR shields also extend through the slot on either side of the cable. When the cover is closed and opened over 180.degree., the cable applies force to the bushing, which is free to rotate as dictated by the force applied by the cable. The rotation of the bushing effectively provides two bending regions on the top and bottom of the bushing slot so that the cable does not bend through the entire range of motion of the cover at a single point. Since the bending of the cable is distributed, fatigue due to bending stress is significantly decreased. The mylar shields and the cable are fixed to the cover, close to the hinge, so there is very little sliding friction between the shields and the cable, and the shields engage and easily accommodate the limited sliding within the bushing.
REFERENCES:
patent: 4825395 (1989-04-01), Kinser, Jr. et al.
patent: 4842531 (1989-06-01), Takemura
patent: 4986763 (1991-01-01), Boyle
patent: 5253142 (1993-10-01), Weng
"Improving Reliability of Flat Cable Assemblies", George Hansell and Herb Van Deusen, pp. 142-146, Paper presented at: Twelfth Annual Connector Symposium Proceedings, Cherry Hill, N.J. (17-18 Oct., 1979).
AST Research Inc.
Phillips Michael W.
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