Motor vehicles – Including one or more ski-like or runner members – With at least one surface-engaging propulsion element
Patent
1976-11-11
1979-01-09
Betts, Kenneth H.
Motor vehicles
Including one or more ski-like or runner members
With at least one surface-engaging propulsion element
123102, 180110, 73519, B60K 3100
Patent
active
041334078
ABSTRACT:
A manually controlled set-speed-selector on the speedometer of a vehicle causes a pair of normally open electrical contacts to close when the speedometer indicator needle reaches the set point. This actuates a solenoid valve which applies intake manifold vacuum to an accelerator actuator to pull on a chain connected to the accelerator, thereby decelerating the vehicle. A vacuum relief valve enables the driver to over-ride the decelerating action for passing or emergency purposes. The flexibility of the chain enables the driver to slow down at any time by simply releasing foot pressure on the accelerator. One electrical contact is connected to the speedometer indicator needle by a torsion spring, which allows the contacts to chatter as they close due to vehicle vibration. The on time of the chattering contacts increases as the set speed is exceeded and reaches 100% at a predetermined overspeed value. The chattering contacts cause the vacuum to be applied in pulses to the accelerator actuator, thus producing a variable magnitude pull on the accelerator chain, the magnitude of the pull being directly proportional to the overspeed magnitude up to the point of 100% on time of the contacts. An optional mode of operation provides for "foot-off" operation which is initiated by manually engaging a latching relay-valve after the reaching of a desired speed has been signalled by a lifting of the accelerator pedal. This in turn causes engagement of a vacuum actuator to provide a steady force to the accelerator which opposes that of the accelerator actuator, thereby maintaining a preset speed until said speed is terminated by brake actuation or by a turning off of the device.
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patent: 3087340 (1963-04-01), McMurray et al.
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patent: 3166145 (1965-01-01), Wheeler
patent: 3216522 (1965-11-01), Cassano
patent: 3217827 (1965-11-01), Pickles
patent: 3298482 (1967-01-01), Mueller et al.
patent: 3460573 (1969-08-01), Beveridge et al.
patent: 3489239 (1970-01-01), Thorner
patent: 3895684 (1975-07-01), Takeshi et al.
patent: 3921670 (1975-11-01), Clippard
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