Patent US3764975A successfully refreshed from Google Patents.
US3764975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle speed responsive control and signal device
Assignee: Northrop Grumman Space and Mission Systems Corp
•
Filing: 1972-05-30
•
Granted: 1973-10-09
•
Expires: 1992-05-30
Abstract
Abstract A control device for controlling the ignition timing of a vehicle is activated when the vehicle reaches a first predetermined speed and is retained in activated condition until the vehicle de-accelerates to a second lower predetermined speed. A frequency signal generator operated by the speedometer cable feeds a signal frequency proportional to the vehicle speed to a pair of bandpass switch devices respectively adapted to pass signals representative of the first and second predetermined speeds, the first channel including a normally open switch adapted to be closed by the passed signal and to be maintained closed until activated by a passed signal from the second channel closing a second normally open switch. In two embodiments, means for maintaining the switch of the first channel closed respectively comprise a relay switch having a pair of windings in opposed or bucking relationship and a bipolar condenser initially charged by the first passed signal and subsequently effectively shorted by the second passed signal.
Inventors
- 👤 R Hayden
- 👤 M Guarasci
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:41
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/4802; G01P1/00; G01P1/07; G01P1/08; G01P1/10; G01P1/103
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
148 words
A speed responsive control device for an automobile having means for producing an electrical speed signal of a frequency which is a direct function of the speed of the automobile and adapted to energize a load responsive to a predetermined frequency of said signal and to de-energize said load responsive to a lower predetermined frequency of said signal and comprising in combination: a first circuit channel for energizing said load and having a normally open switch adapted to be closed responsive to said predetermined frequency; means for maintaining said load energized upon subsequent opening of said first channel switch; a second circuit channel having a normally open switch adapted to be closed responsive to said lower frequency signal; and means connecting said second circuit channel to said maintaining means to de-energize the latter upon closure of said switch of said second channel responsive to said lower frequency signal.
Claim 2
Dependent Claim
148 words
A speed responsive control device for an automobile having means for producing an electrical speed signal of a frequency which is a direct function of the speed of the automobile and adapted to energize a load responsive to a predetermined frequency of said signal and to de-energize said load responsive to a lower predetermined frequency of said signal and comprising in combination: a first circuit channel for energizing said load and having a normally open switch adapted to be closed responsive to said predetermined frequency; means for maintaining said load energized upon subsequent opening of said first channel switch; a second circuit channel having a normally open switch adapted to be closed responsive to said lower frequency signal; and means connecting said second circuit channel to said maintaining means to de-energize the latter upon closure of said switch of said second channel responsive to said lower frequency signal.
Claim 3
Dependent Claim
36 words
The control device of claim 1 in which each circuit channel contains a normally open frequency bandpass switch device and an output terminal adapted to be connected to chassis ground by closure of said switch device.
Claim 4
Dependent Claim
74 words
The control device of claim 1 in which each circuit channel contains a normally open frequency bandpass switch device and an output terminal adapted to be connected to chassis ground by closure of said switch device and in which one of said normally open frequency bandpass switches is closable responsive to said signal of predetermined frequency and the other of said frequency bandpass switches is closable responsive to said signal of lower predetermined frequency.
Claim 5
Dependent Claim
120 words
The control device of claim 1 in which each circuit channel contains a normally open frequency bandpass switch device and an output terminal adapted to be connected to chassis ground by closure of said switch device and in which one of said normally open frequency bandpass switches is closable responsive to said signal of predetermined frequency and the other of said frequency bandpass switches is closable responsive to said signal of lower predetermined frequency and a normally non-conducting transistor comprising an emitter and a collector connected in series between a positive source of battery voltage and chassis ground and having a base connectable to ground through said normally open frequency bandpass switch device responsive to said signal of predetermined frequency.
Claim 6
Dependent Claim
80 words
The control device of claim 1 in which the means for maintaining said load energized upon subsequently opening of said first channel switch comprises a relay having opposed windings and two normally open contacts adapted to be closed upon energising of either of said windings, one of said contacts connecting to said load, the armature of said relay, said one contact and one of said windings being connected electrically in series between a source of positive voltage and chassis ground.
Claim 7
Dependent Claim
261 words
A speed responsive control device for an automobile having means for producing an electrical speed signal of a frequency which is a direct function of the speed of the automobile and adapted to energize a load responsive to a predetermined frequency of said signal and to de-energize saId load responsive to a lower predetermined frequency of said signal and comprising in combination: a first circuit channel in the form of a normally open frequency bandpass switch device adapted to be closed electrically at said predetermined frequency; a normally non-conducting transistor comprising an emitter and a collector connected in series between a positive source of battery voltage and chassis ground and having a base connected to said normally open frequency bandpass switch; a first normally open circuit element for connecting said load between said positive source of voltage and chassis ground; means for closing said circuit element responsive to conduction of said transistor provided by closure of said bandpass switch; means for maintaining said load energized between said source and chassis ground upon opening of said frequency bandpass switch responsive to a frequency different from said predetermined frequency; a second circuit channel in the form of a normally open frequency bandpass switch device acapted to close responsive to said signal of lower frequency; a normally non-conducting circuit element for said second channel rendered conducting by closure of said second frequency bandpass switch device; and means connnecting said second circuit element and de-energizing of the load responsive to said second frequency switch upon closure of the latter responsive to said lower frequency signal.
Claim 8
Dependent Claim
261 words
A speed responsive control device for an automobile having means for producing an electrical speed signal of a frequency which is a direct function of the speed of the automobile and adapted to energize a load responsive to a predetermined frequency of said signal and to de-energize saId load responsive to a lower predetermined frequency of said signal and comprising in combination: a first circuit channel in the form of a normally open frequency bandpass switch device adapted to be closed electrically at said predetermined frequency; a normally non-conducting transistor comprising an emitter and a collector connected in series between a positive source of battery voltage and chassis ground and having a base connected to said normally open frequency bandpass switch; a first normally open circuit element for connecting said load between said positive source of voltage and chassis ground; means for closing said circuit element responsive to conduction of said transistor provided by closure of said bandpass switch; means for maintaining said load energized between said source and chassis ground upon opening of said frequency bandpass switch responsive to a frequency different from said predetermined frequency; a second circuit channel in the form of a normally open frequency bandpass switch device acapted to close responsive to said signal of lower frequency; a normally non-conducting circuit element for said second channel rendered conducting by closure of said second frequency bandpass switch device; and means connnecting said second circuit element and de-energizing of the load responsive to said second frequency switch upon closure of the latter responsive to said lower frequency signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |