Communications: electrical – Selective – Having indication or alarm
Patent
1981-10-08
1983-08-09
Trafton, David L.
Communications: electrical
Selective
Having indication or alarm
73847, 180271, 280777, 340679, 3408703, G08B 2100
Patent
active
043981739
ABSTRACT:
In a vehicle steering system for automobiles, for example, a steering column is provided with a rotatable flexible shaft at the end thereof for improving the ability of the column to absorb energy in a crash situation. The flexible shaft has at least one strip of a plastic material, preferably polyvinylidene fluoride film made piezoelectric by known methods, secured to an outermost winding of the flexible shaft. Turning the steering wheel will torsionally deflect the flexible shaft which causes the piezoelectric strips to generate millivoltages thereacross. A deteriorating flexible shaft will deflect more under torsional stress than a comparable newer flexible shaft and the piezoelectric strip or strips secured to the deteriorating shaft will consequently produce higher millivoltages. These millivoltages are amplified and fed to indicating means for indicating the degree of safeness of the flexible shaft.
REFERENCES:
patent: 3293585 (1966-12-01), Horn
patent: 3509942 (1970-05-01), Lindberg
patent: 3596269 (1971-07-01), Laska
patent: 3936071 (1976-02-01), Ricketts et al.
patent: 3980999 (1976-09-01), Nishioka et al.
patent: 3988027 (1976-10-01), Serizawa et al.
Bloomfield Philip E.
Kulischenko Walter
Pennwalt Corporation
Trafton David L.
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