GB718383A - Improvements in and relating to overspeed devices - Google Patents
Improvements in and relating to overspeed devicesInfo
- Publication number
- GB718383A GB718383A GB28423/51A GB2842351A GB718383A GB 718383 A GB718383 A GB 718383A GB 28423/51 A GB28423/51 A GB 28423/51A GB 2842351 A GB2842351 A GB 2842351A GB 718383 A GB718383 A GB 718383A
- Authority
- GB
- United Kingdom
- Prior art keywords
- engine
- resistor
- speed
- voltage
- capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K31/00—Vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed, i.e. preventing speed from exceeding an arbitrarily established velocity or maintaining speed at a particular velocity, as selected by the vehicle operator
- B60K31/02—Vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed, i.e. preventing speed from exceeding an arbitrarily established velocity or maintaining speed at a particular velocity, as selected by the vehicle operator including electrically actuated servomechanism including an electric control system or a servomechanism in which the vehicle velocity affecting element is actuated electrically
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/093—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against increase beyond, or decrease below, a predetermined level of rotational speed
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
718,383. Engine stop gear. BRITISH THOMSON-HOUSTON CO., Ltd. Dec. 4, 1951 [Dec. 5, 1950], No. 28423/51. Class 122(4) [Also in Group XXXVIII] A device responsive to overspeed of an engine comprises a capacitor and a resistor series connected across a source of voltage the frequency of which is proportional to engine speed, a contact making microammeter or other voltage responsive device connected across the resistor responding at a predetermined speed i.e. when the impedance of the capacitor has been reduced sufficiently to increase the voltage drop across the resistor to a predetermined value to stop the engine. As shown, applied to a testing device for internal combustion engines, a push-button 25 is momentarily closed to energize a relay 22 which locks at 23, and, at 24, closes the ignition circuit through the ignition switch 12 and circuit breaker 13 to the ignition coil 15. The voltage thus applied by battery 10 to the ignition coil, pulsates at a frequency proportional to engine speed, and is applied across a capacitor 18 in series with a potentiometer 19. The capacitor impedance is preferably greater than that of the resistor 19 over the speed range in question, so that the voltage drop across the resistor is substantially proportional to speed. At a predetermined maximum permissible speed, a microammeter 21 connected across a portion of the potentiometer 19 closes contacts 21b to short circuit the relay 22 to open the ignition circuit at 24 and thus stop the engine. In another arrangement, Fig. 2, the pulsating voltage is produced by a moving contact 30, pivoted at 31 and oscillated between fixed contacts by a reciprocating part 29 of the engine, whereby the impedance combination 18, 19 is alternately connected across batteries 10a, 10b connected in opposition.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US718383XA | 1950-12-05 | 1950-12-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB718383A true GB718383A (en) | 1954-11-10 |
Family
ID=22103913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB28423/51A Expired GB718383A (en) | 1950-12-05 | 1951-12-04 | Improvements in and relating to overspeed devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB718383A (en) |
-
1951
- 1951-12-04 GB GB28423/51A patent/GB718383A/en not_active Expired
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