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US 3,947,814 AGranted
Audio tachometer system
OwnerJames W. Alleninventor
Life of this patent
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Abstract
An audio-tachometer system including an electronic tachometer having a first pointer for indicating engine speed, and a second pointer that is manually settable to a desired engine speed for shifting gears, wherein the engine speed corresponds to the speed at which the second pointer is set, an electrically conductive edge of the first pointer will bridgeably interconnect a pair of contacts mounted upon the second pointer to close an electrical circuit and thereby supply power to energize a signal means, e.g., audio tone generator.
Claims11
An audio tachometer system comprising:
- an electronic tachometer including a first pointer and a second pointer, said first pointer being indicative of engine speed, said second pointer being manually settable to a desired engine speed;
- an audio tone generator having a voltage input terminal;
- a voltage source;
- a pair of electrical contacts, each being electrically isolated form the other and rigidly mounted upon said second pointer, one of said contacts being interwired to said voltage source, the other of said contacts being interwired to said voltage input terminal of said audio tone generator;
- and
- electrically conductive means upon said first pointer for bridgeably interconnecting said pair of contacts whenever said first pointer is positioned at the engine speed indicated by the second pointer, thereby interconnecting said voltage source to said voltage input terminal of said audio tone generator to energize said tone generator.
3 more elements
A tachometer system comprising:
- an electronic tachometer including a first pointer and a second pointer, said first pointer being indicative of engine speed, and said second pointer being manually settable to a desired engine speed;
- means for providing a signal, said signal means having a voltage input terminal:
- a voltage source;
- a pair of electrical contacts, each being electrically isolated form the other and rigidly mounted upon said second pointer, one of said contacts being interwired to said voltage source, the other of said contacts being interwined to said voltage input terminal of said signal means;
- and
- electrically conductive means upon said first pointer for bridgeably interconnecting said pair of contacts whenever said first pointer is positioned at the engine speed indicated by the second pointer, thereby interconnecting said voltage source to said voltage input terminal of said signal means to energize said signal means.
3 more elements
Dependencies are inferred from the claim text.