Presettable speedometer for automotive vehicle

Details Presettable speedometer for automotive vehicle Presettable speedometer for automotive vehicle

1975-06-17

1976-12-28

Gill, James J.

Measuring and testing

Speed, velocity, or acceleration

Acceleration determination utilizing inertial element

73519, 340 62, 340263, G01P 349, G01P 350

Patent

active

039994414

ABSTRACT:
A drum angularly entrained via a magnetic coupling by a shaft of a vehicular transmission, against a spring force, is linked via another magnetic coupling with a coaxial follower member carrying a printed circuit whose conductors are engageable by respective contact brushes normally spaced therefrom, the brushes acting as brakes upon being moved into contact with the conductors so as to arrest the follower member. An alarm device, which may emit a warning sound and/or carry out a control function, responds to a photoelectric sensor including a light emitter and a light receiver on the follower member coacting with a shutter on the drum, the sensor actuating the alarm device upon a relative displacement of the follower member and the drum beyond a selected relative angular position. A pushbutton, serving to bring the brushes into contact with the printed-circuit conductors, simultaneously connects the alarm device to its power supply.

REFERENCES:
patent: 3468168 (1969-09-01), Colling
patent: 3490295 (1970-01-01), Westby et al.

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