Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1977-01-19
1978-11-21
Scott, Samuel
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
B60K 4118
Patent
active
041260619
ABSTRACT:
A signal failure circuit for incorporation in a control circuit of vehicle automatic transmission system of the type having a generator which produces a fluctuating signal, comprises an interval timer including a comparator and a capacitor, the latter being charged by means of a charging circuit and discharged by means of a transistor which is rendered conductive by pulses of a pulse train derived from said fluctuating signal. When said pulses cease the comparator provides an output to a monostable circuit which thereby switches to its unstable state to activate safety circuits associated with the transmission system. The monostable circuit will remain in its unstable state for a predetermined time after the return of the pulses of the pulse train. The charging circuit of the capacitor is conveniently controlled by a further transistor the conduction of which is dependent upon the output voltage of an a.c.-d.c. converter which also receives said train of pulses.
REFERENCES:
patent: 3732755 (1973-05-01), Beig et al.
patent: 3937108 (1976-02-01), Will
patent: 3961546 (1976-06-01), Gilmore et al.
patent: 4044634 (1977-08-01), Florus et al.
Chandler Lance W.
Lucas Industries Limited
Scott Samuel
LandOfFree
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