CA1170338A - Timing circuits - Google Patents
Timing circuitsInfo
- Publication number
- CA1170338A CA1170338A CA000384255A CA384255A CA1170338A CA 1170338 A CA1170338 A CA 1170338A CA 000384255 A CA000384255 A CA 000384255A CA 384255 A CA384255 A CA 384255A CA 1170338 A CA1170338 A CA 1170338A
- Authority
- CA
- Canada
- Prior art keywords
- projectile
- chaff
- dispensing
- timing
- functions
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/28—Modifications for introducing a time delay before switching
Landscapes
- Radar Systems Or Details Thereof (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A circuit arrangement for timing a delay between functions, such as the time delay between the launching of a chaff-dispensing projectile and the dispensing of chaff by said projectile, comprises tuned circuit means responsive to an elec-trical signal for predetermined frequency which has a duration for determining said delay between functions and further com-prises means conditioned in dependence upon the duration of said signal and means effective when the first of said functions is performed to cause the conditioned means to respond for the timing of said delay.
A circuit arrangement for timing a delay between functions, such as the time delay between the launching of a chaff-dispensing projectile and the dispensing of chaff by said projectile, comprises tuned circuit means responsive to an elec-trical signal for predetermined frequency which has a duration for determining said delay between functions and further com-prises means conditioned in dependence upon the duration of said signal and means effective when the first of said functions is performed to cause the conditioned means to respond for the timing of said delay.
Description
1 1 7~33~s I MP ROVE MENT S RE LAT I NG TO T I MI NG C I RC U I TS .
__ This invention r~lates to timing circuit arrangements and is especially, but not exclusively, applicable to timing circuit arrangements for timing a delay between the launching and the release of chaff from so-called chaLf-dispensing pro~ectiles employed for radar decoy puzposes.
According to the present invention there is provided an electrical circuit arrange~.ent for timing a delay between the performance fllnctions, said circuit arrangement comprising tuned circuit means responsive to an electrical signal of predetermined frequency which has a duration 'or determining said delay between functions, means conditione in dependence upon the duration of said signal and means effective when the first of said functions is performed to cause the conditioned means to respond for the timing of said delay.
In one arrangement for carrying out the present invention in an analogue mode the means conditioned in dependence upon the time delay between functions may comprise capacitor means arranged to be charged to a level dependent upon the requisite time delay between functions and subsequently discharged at a predetermined rate and to a predeter~ined low level for the measurement of said time delay at the expiration of which an electrical output is provided to initiate the second of ~aid functions.
Jn a.. alternative circuit arrange~ent for carrying out -~, the present invention digitally the means conditioned in dependence upon the requisite time delay may comprise counter means arranged to be stepped to a predetermined count position thereof indicative of the requisite time delay between functions and subsequently rendered effective when the first of the aforesaid functions is performed to step progressively at a predetermined rate to an output position whereat an output for causing the execution of the other of said functions is derived from said counting means at the expiration of said time delay.
The digital timing arrangement just above described may well be significantly smaller and cheaper than the analogue arrangement described.
As will be appreciated from the foregoing the timing circuit arrangement according to the present invention may have many different applications but its incorporation for example in a chaff-dispensing projectile for timing an interval between the launching of the projectile and the dispensing therefrom of chaff is especially envisaged. In such an application the electrical signal, the duration of which predetermines the time delay between the launching of the projectile and the initiation of a chaff dispensing operation and to which the tuned circuit responds, may be applied to the projectile from a projectile launching barrel through an inductive coupling device. The coupling device may also serve to transmit to the projectile electrical signals of different frequencies to that utilised for timing purposes. For instance, one of these signals may be utilized for causing detona-tion or firing of a rocket motor for the projectile whilst another 1 ~ 70338 may serve to charge capacitor means for providing electrical power required inter alia for detonating a charge which initiates a chaff-dispensing operation when the time delay expires as afore-said to produce an electrical output from the timing circuit means.
By way of example the present invention will now be described with reference to the accompanying drawings in which;
Figure 1 shows a schematic circuit diagram of a chaff dispensing projectile embodying an analogue timing circuit arrange-ment for timing a delay between the launching of the projectile and the detonation of a charge therein for initiating the chaff-dispensing operation;
Figure 2 shows an alternative digital timing circuit arrangement to that shown in Figure l;
Figure 3 shows a circuit for operating one of the clock pulse generators of Figure 2; and, Figure 4 shows a circuit for maintaining operation of the other of the clock pulse generators of Figure 2 should an inertia switch of the projectile restore before the charge for initiating the chaff-dispensing operation is detonated.
Referr~ng to Figure 1 the circuit arrangement shown with-in the dotted line box 1 is embodied in a self-propelled projectile having a rocket motor and carrying chaff in the nose portion which is arranged to be separated from the projectile for the dispensing of chaff in response to the firing of a charge and the conse-quential operation of a gas generator~ This projectile is adapted to be launched from a launching barrel which has associated with it the circuit arrangement shown within the dotted box 2.
1 1 7033~
The circuit arrangement within the box 2 comprises signal generating means 3 for generating electrical signals at three different frequencies (e.g. 5, 15, and 20 KHz). These signals will be selectively applied as hereinafter described to the primary 4 of an inductive coupling device 5, such as a txansformer with dust cores, the secondary of which indicated at 6 is embodied in a chaff-carrying projectile to be launched from the aforesaid launching barrel which embodies the primary 4.
Preparatory to launching the chaff-carrying projectile a first frequency signal (e.g. 5 KHz) from the generating means 3 is selectively applied to the projectile through the inductive coupling device 5. This signal is rectified by means of a half-wave rectifier 7 and serves to charge a storage capacitor 8 which will subsequently be utilized inter alia for providing electrical energy for the firing of a charge for initiating the dispensing of chaff fxom nose part of the projectile.
After this initial capacitor charging operation a second frequency signal (e.g. 20 KHz) derived from the generating means is then applied to the projectile though the inductive coupling device 5. The duration of this signal pulse, Tl, say, will determine the time delay between the launch of the projectile and the detonation of the charge carried by the projectile for chaff dispensing purposes. A tuned circuit comprising an inductor 9 and capacitor 10 responds selectively to the signal pulse of duration Tl so that the pulse operates an electrical switch 11 of an analogue timing circuit shown within the chain line box 12.
Operation of switch 11 allows a substantially constant current I
~ - 4 -derived from capacitor 8 to flow for time Tl into a timing capaci-tor 13 through resistor 14. At this juncture the time delay between launch and chaff dispensing has effectively been stored in the timing circuit since the charge on capacitor 10 is given by IlTl. For launching the projectile a third frequency signal (e.g. 15 KHz) derived from the signal generating means 3 is applied to the projectile through the inductive coupling device 5. To this signal a further tuned circuit comprising inductor 15 and a capacitor 16 selectively responds so that the signal effects ignition of the rocket motor of the projectile by igniting a match-head firing device 17. The rocket motor is accordingly ignited and the projectile will be launched from the launching barrel.
Assuming the launch is satisfactory an inertia switch 18 included in the timing circuit 12 will be operated immediately after launch due to the acceleration of the projectile and this switch will then effec~ively be latched so that it cannot interrupt the timing operation before the nose of the projectile has been separated for chaff dispensing purposes. This effective latching of the inertia switch 18 may be produced by electrical means as will hereinafter be described.
As will be seen from the circuit diagram operation of the inertia switch 18 closes a circuit for the discharge of the capacitor 13 through a resistor 19 so that a substantially constant current I2 flows therethrough. The voltage Vc as the capacitor 13 discharges is compared with a reference voltage VR by a comparator 20 which provides an output effective to turn on an FET 21 when the voltage Vc reaches a predetermined low level. The conduction I 1 7~338 of the FET 21 completes a discharge circuit for the capacitor 8 and the ignition of a match-head detonator 22 which detonates a charge for initiating the dispensing of chaff from the projectile in response to the separation of the nose part of the projectile by gas p.ressure. In order to prevent the comparator 20 producing an output signal which would prematurely turn on the FET 21 the comparator 20 will be disabled until the inertia switch 18 operates.
As previously mentioned the charge on the capacitor 13 is given by:-CC = Il Tl Discharge of capacitor C to predetermined voltage Vc isgiven by CD = I2 T2 where T2 is the time delay between launch and chaff dispensing.
Thus Il Tl = I2 T2 T2 = Il Tl If Il = lOmA and I2 = O.lmA
Then T2 = lOOTl As will be appreciated from the foregoing description the timing circuit will not be rendered operative to commence timing and consequently chaff dispensing will not take place if the launch is unsatisfactory as indicated by the failure of the inertia switch to operate.
The present invention also provides a digital timing circuit arrangement which will now be described with reference to Figures 2 to 4 and which may be used instead of the analogue 137033~
timing circuit arrangement described above and contained within the box 12 in Figure 1.
In the case of ~his digital timing circuit arrangement it will be seen by reference to Figure 3 that the pulse of dura-tion T1 to which the tuned circuit 9, 10 (Figure 1) responds is rectified by rectifier 23 and then fed to a comparator 24 which derives a reference signal V therefor from a potential divider 25, 26 and responds to the rectified pulse signal to provide a dc pulse output of duration Tl as shown which is then utilized to enable a first clock pulse generator 27 (Figure 2) providing a first frequenc~ pulse output (e.g. 160 KHz). The output from this clock pulse generator 27 steps a counter 28 through an OR gate 29 to a position corresponding to the duration Tl of the timing pulse.
When an inertia switch 30 (Figure 4) operates consequent upon the satisfactory launching of the projectile a clock pulse generator 31 (Figure 2) is operated for producing a second frequency pulse output (e.g. 1.6 KHz). This second frequency pulse output passes through the OR gate 29 and drives the counter 28 forward from its count position corresponding to the duration Tl of the timing pulse to the end or output position thereof at which an electrical output is derived from the counter. The time taken to step the counter 28 from the first count position referred to to the end position corresponds to the time delay ; between the projectile launch and detonation of the charge for initiating chaff-dispensing. To achieve this detonation the out-put from the counter 28 may be utilized to operate an FET 21 (Figure 13 which as described with reference to Figure 1 then I ~ 70338 closes a discharge circuit for the storage capacitor 8 which dis-charges through a match-head detonator 22.
In the digital timing circuit arrangement described operation of the inertia switch 30 (Figure 4) may be arranged to cause a capacitor 32 to be charged from the storage capacitor 8 (Figure 1) over a supply line 33 through resistor 34. The charge on the capacitor 32 causes a comparator 35 to prGvide an output for enabling the clock generator 31 to operate. Should the inertia switch 30 restore after its initial operation the capacitor 32 will be discharged very slowly through a high value resistor 36 to maintain the clock pulse generator 31 in operation for at least the delay period being timed between the launch of the projectile and the detonation of the charge for chaff dispensing purposes.
In operation of the digital timing circuit arrangement the time delay T2 is given by:
T2 = time taken to step counter from 1st count position to end position at 1.6 KHz Now Tl = time taken to step counter to 1st count position at 160 KHz.
If counter has 8000 count positions and 1st count position is at 1500 then T2 = 6500 and 1.6KHz T = 1500. Therefore, T = T (6500 x 160) 1 2 1 (1.6 x 1500) 160 KHz T2 = T1 433.3 It will be apparent from both of the embodiments described with reference to the drawings that the failure of the inertia switch to operate due to a faulty launch will prevent the time delay being I J 7~338 commenced so as to prevent the detonation of the charge of chaff dispensing purposes under conditions of faulty launching. More-over, in the case of the digital ~iming circuit arrangement failure of the first clock pulse generator 27 (Figure 2) to be enabled so that the counter 28 is stepped to a count position will not cause premature and hazardous detonation of the charge for chaff dispensing since the second clock pulse generator 31 will cause the counter to step through the full counting sequence (e.g. 8000 positions) before the charge for chaff dispensing is ignited. In this way a time delay in excess of the normal time delay will be provied for.
__ This invention r~lates to timing circuit arrangements and is especially, but not exclusively, applicable to timing circuit arrangements for timing a delay between the launching and the release of chaff from so-called chaLf-dispensing pro~ectiles employed for radar decoy puzposes.
According to the present invention there is provided an electrical circuit arrange~.ent for timing a delay between the performance fllnctions, said circuit arrangement comprising tuned circuit means responsive to an electrical signal of predetermined frequency which has a duration 'or determining said delay between functions, means conditione in dependence upon the duration of said signal and means effective when the first of said functions is performed to cause the conditioned means to respond for the timing of said delay.
In one arrangement for carrying out the present invention in an analogue mode the means conditioned in dependence upon the time delay between functions may comprise capacitor means arranged to be charged to a level dependent upon the requisite time delay between functions and subsequently discharged at a predetermined rate and to a predeter~ined low level for the measurement of said time delay at the expiration of which an electrical output is provided to initiate the second of ~aid functions.
Jn a.. alternative circuit arrange~ent for carrying out -~, the present invention digitally the means conditioned in dependence upon the requisite time delay may comprise counter means arranged to be stepped to a predetermined count position thereof indicative of the requisite time delay between functions and subsequently rendered effective when the first of the aforesaid functions is performed to step progressively at a predetermined rate to an output position whereat an output for causing the execution of the other of said functions is derived from said counting means at the expiration of said time delay.
The digital timing arrangement just above described may well be significantly smaller and cheaper than the analogue arrangement described.
As will be appreciated from the foregoing the timing circuit arrangement according to the present invention may have many different applications but its incorporation for example in a chaff-dispensing projectile for timing an interval between the launching of the projectile and the dispensing therefrom of chaff is especially envisaged. In such an application the electrical signal, the duration of which predetermines the time delay between the launching of the projectile and the initiation of a chaff dispensing operation and to which the tuned circuit responds, may be applied to the projectile from a projectile launching barrel through an inductive coupling device. The coupling device may also serve to transmit to the projectile electrical signals of different frequencies to that utilised for timing purposes. For instance, one of these signals may be utilized for causing detona-tion or firing of a rocket motor for the projectile whilst another 1 ~ 70338 may serve to charge capacitor means for providing electrical power required inter alia for detonating a charge which initiates a chaff-dispensing operation when the time delay expires as afore-said to produce an electrical output from the timing circuit means.
By way of example the present invention will now be described with reference to the accompanying drawings in which;
Figure 1 shows a schematic circuit diagram of a chaff dispensing projectile embodying an analogue timing circuit arrange-ment for timing a delay between the launching of the projectile and the detonation of a charge therein for initiating the chaff-dispensing operation;
Figure 2 shows an alternative digital timing circuit arrangement to that shown in Figure l;
Figure 3 shows a circuit for operating one of the clock pulse generators of Figure 2; and, Figure 4 shows a circuit for maintaining operation of the other of the clock pulse generators of Figure 2 should an inertia switch of the projectile restore before the charge for initiating the chaff-dispensing operation is detonated.
Referr~ng to Figure 1 the circuit arrangement shown with-in the dotted line box 1 is embodied in a self-propelled projectile having a rocket motor and carrying chaff in the nose portion which is arranged to be separated from the projectile for the dispensing of chaff in response to the firing of a charge and the conse-quential operation of a gas generator~ This projectile is adapted to be launched from a launching barrel which has associated with it the circuit arrangement shown within the dotted box 2.
1 1 7033~
The circuit arrangement within the box 2 comprises signal generating means 3 for generating electrical signals at three different frequencies (e.g. 5, 15, and 20 KHz). These signals will be selectively applied as hereinafter described to the primary 4 of an inductive coupling device 5, such as a txansformer with dust cores, the secondary of which indicated at 6 is embodied in a chaff-carrying projectile to be launched from the aforesaid launching barrel which embodies the primary 4.
Preparatory to launching the chaff-carrying projectile a first frequency signal (e.g. 5 KHz) from the generating means 3 is selectively applied to the projectile through the inductive coupling device 5. This signal is rectified by means of a half-wave rectifier 7 and serves to charge a storage capacitor 8 which will subsequently be utilized inter alia for providing electrical energy for the firing of a charge for initiating the dispensing of chaff fxom nose part of the projectile.
After this initial capacitor charging operation a second frequency signal (e.g. 20 KHz) derived from the generating means is then applied to the projectile though the inductive coupling device 5. The duration of this signal pulse, Tl, say, will determine the time delay between the launch of the projectile and the detonation of the charge carried by the projectile for chaff dispensing purposes. A tuned circuit comprising an inductor 9 and capacitor 10 responds selectively to the signal pulse of duration Tl so that the pulse operates an electrical switch 11 of an analogue timing circuit shown within the chain line box 12.
Operation of switch 11 allows a substantially constant current I
~ - 4 -derived from capacitor 8 to flow for time Tl into a timing capaci-tor 13 through resistor 14. At this juncture the time delay between launch and chaff dispensing has effectively been stored in the timing circuit since the charge on capacitor 10 is given by IlTl. For launching the projectile a third frequency signal (e.g. 15 KHz) derived from the signal generating means 3 is applied to the projectile through the inductive coupling device 5. To this signal a further tuned circuit comprising inductor 15 and a capacitor 16 selectively responds so that the signal effects ignition of the rocket motor of the projectile by igniting a match-head firing device 17. The rocket motor is accordingly ignited and the projectile will be launched from the launching barrel.
Assuming the launch is satisfactory an inertia switch 18 included in the timing circuit 12 will be operated immediately after launch due to the acceleration of the projectile and this switch will then effec~ively be latched so that it cannot interrupt the timing operation before the nose of the projectile has been separated for chaff dispensing purposes. This effective latching of the inertia switch 18 may be produced by electrical means as will hereinafter be described.
As will be seen from the circuit diagram operation of the inertia switch 18 closes a circuit for the discharge of the capacitor 13 through a resistor 19 so that a substantially constant current I2 flows therethrough. The voltage Vc as the capacitor 13 discharges is compared with a reference voltage VR by a comparator 20 which provides an output effective to turn on an FET 21 when the voltage Vc reaches a predetermined low level. The conduction I 1 7~338 of the FET 21 completes a discharge circuit for the capacitor 8 and the ignition of a match-head detonator 22 which detonates a charge for initiating the dispensing of chaff from the projectile in response to the separation of the nose part of the projectile by gas p.ressure. In order to prevent the comparator 20 producing an output signal which would prematurely turn on the FET 21 the comparator 20 will be disabled until the inertia switch 18 operates.
As previously mentioned the charge on the capacitor 13 is given by:-CC = Il Tl Discharge of capacitor C to predetermined voltage Vc isgiven by CD = I2 T2 where T2 is the time delay between launch and chaff dispensing.
Thus Il Tl = I2 T2 T2 = Il Tl If Il = lOmA and I2 = O.lmA
Then T2 = lOOTl As will be appreciated from the foregoing description the timing circuit will not be rendered operative to commence timing and consequently chaff dispensing will not take place if the launch is unsatisfactory as indicated by the failure of the inertia switch to operate.
The present invention also provides a digital timing circuit arrangement which will now be described with reference to Figures 2 to 4 and which may be used instead of the analogue 137033~
timing circuit arrangement described above and contained within the box 12 in Figure 1.
In the case of ~his digital timing circuit arrangement it will be seen by reference to Figure 3 that the pulse of dura-tion T1 to which the tuned circuit 9, 10 (Figure 1) responds is rectified by rectifier 23 and then fed to a comparator 24 which derives a reference signal V therefor from a potential divider 25, 26 and responds to the rectified pulse signal to provide a dc pulse output of duration Tl as shown which is then utilized to enable a first clock pulse generator 27 (Figure 2) providing a first frequenc~ pulse output (e.g. 160 KHz). The output from this clock pulse generator 27 steps a counter 28 through an OR gate 29 to a position corresponding to the duration Tl of the timing pulse.
When an inertia switch 30 (Figure 4) operates consequent upon the satisfactory launching of the projectile a clock pulse generator 31 (Figure 2) is operated for producing a second frequency pulse output (e.g. 1.6 KHz). This second frequency pulse output passes through the OR gate 29 and drives the counter 28 forward from its count position corresponding to the duration Tl of the timing pulse to the end or output position thereof at which an electrical output is derived from the counter. The time taken to step the counter 28 from the first count position referred to to the end position corresponds to the time delay ; between the projectile launch and detonation of the charge for initiating chaff-dispensing. To achieve this detonation the out-put from the counter 28 may be utilized to operate an FET 21 (Figure 13 which as described with reference to Figure 1 then I ~ 70338 closes a discharge circuit for the storage capacitor 8 which dis-charges through a match-head detonator 22.
In the digital timing circuit arrangement described operation of the inertia switch 30 (Figure 4) may be arranged to cause a capacitor 32 to be charged from the storage capacitor 8 (Figure 1) over a supply line 33 through resistor 34. The charge on the capacitor 32 causes a comparator 35 to prGvide an output for enabling the clock generator 31 to operate. Should the inertia switch 30 restore after its initial operation the capacitor 32 will be discharged very slowly through a high value resistor 36 to maintain the clock pulse generator 31 in operation for at least the delay period being timed between the launch of the projectile and the detonation of the charge for chaff dispensing purposes.
In operation of the digital timing circuit arrangement the time delay T2 is given by:
T2 = time taken to step counter from 1st count position to end position at 1.6 KHz Now Tl = time taken to step counter to 1st count position at 160 KHz.
If counter has 8000 count positions and 1st count position is at 1500 then T2 = 6500 and 1.6KHz T = 1500. Therefore, T = T (6500 x 160) 1 2 1 (1.6 x 1500) 160 KHz T2 = T1 433.3 It will be apparent from both of the embodiments described with reference to the drawings that the failure of the inertia switch to operate due to a faulty launch will prevent the time delay being I J 7~338 commenced so as to prevent the detonation of the charge of chaff dispensing purposes under conditions of faulty launching. More-over, in the case of the digital ~iming circuit arrangement failure of the first clock pulse generator 27 (Figure 2) to be enabled so that the counter 28 is stepped to a count position will not cause premature and hazardous detonation of the charge for chaff dispensing since the second clock pulse generator 31 will cause the counter to step through the full counting sequence (e.g. 8000 positions) before the charge for chaff dispensing is ignited. In this way a time delay in excess of the normal time delay will be provied for.
Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An electrical circuit arrangement for timing a delay between the performance of functions, said circuit arrangement comprising tuned circuit means responsive to an electrical signal of predetermined frequency which has a duration for determining said delay between the performance of functions, means conditioned in dependence upon the duration of said signal and means effective when the first of said functions is performed to cause the con-ditioned means to respond for the timing of said delay.
2. An electrical circuit arrangement as claimed in claim 1, in which the means conditioned in dependence upon the time delay between the performance of said functions comprises capacitor means arranged to be charged to a level dependent upon the re-quisite time delay between functions and subsequently discharged at a predetermined rate and to a predetermined low level for the measurement of said time delay at the expiration of which an electrical output is provided to initiate the performance of the second of said functions.
3. An electrical circuit arrangement as claimed in claim 1, in which the means conditioned in dependence upon the requisite time delay comprises counter means arranged to be stepped to a predetermined count position thereof indicative of the requisite time delay between the performance of functions and subsequently rendered effective when the first of the functions is performed to step progressively at a predetermined rate to an output position whereat an output for causing the execution of the other of said functions is derived from the counting means at the expiration of the time delay.
4. A chaff-dispensing projectile comprising a circuit arrangement as claimed in claim 1, for timing an interval between the launch of the projectile and the dispensing of chaff there-from, in which the projectile comprises part of an inductive coupling device through which an electrical signal of a pre-determined frequency for causing the timed circuit to respond is transmitted from a projectile launching barrel.
5. A chaff-dispensing projectile as claimed in claim 4, in which a rocket motor is arranged to be fired in response to an electrical signal transmitted to the projectile through the inductive coupling device and having a predetermined frequency different from that of the signal for timing purposes.
6. A chaff-dispensing projectile as claimed in claim 4 or claim 5, in which capacitor means for providing electrical power required for detonating a charge which initiates a chaff-dispensing operation when the time delay expires to produce an electrical output from the timing means is arranged to be charged by an electrical signal which is transmitted to the capacitor means through the inductive coupling device from the launching barrel for the projectile and which has a frequency different from the signal utilised for timing purposes.
7. A chaff-dispensing projectile as claimed in claim 4, in which the inductive coupling device comprises a transformer with dust cores having its secondary embodied in the projectile.
8. A chaff-dispensing projectile as claimed in claim 4, in which the projectile includes inertia switch means operable at launch to render the means conditioned in dependence upon the time delay between launch and chaff dispensing operable to commence timing of said delay.
9. A chaff-dispensing projectile as claimed in claim 4, in which the projectile includes inertia switch means operable at launch to render the means conditioned in dependence upon the time delay between launch and chaff dispensing operable to commence timing of said delay, and in which the inertia switch means includes latching means which prevents interruption of the timing operation once the inertia switch means has operated.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8027200A GB2082862B (en) | 1980-08-21 | 1980-08-21 | Improvements relating to timing circuits |
| GB8027200 | 1980-08-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1170338A true CA1170338A (en) | 1984-07-03 |
Family
ID=10515580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000384255A Expired CA1170338A (en) | 1980-08-21 | 1981-08-20 | Timing circuits |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1170338A (en) |
| GB (1) | GB2082862B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3408199A1 (en) * | 1983-03-19 | 1984-09-20 | Joh. Vaillant Gmbh U. Co, 5630 Remscheid | Timer |
| GB2160954A (en) * | 1984-05-23 | 1986-01-02 | Plessey Co Plc | Mortars |
| US7369081B1 (en) * | 2005-02-25 | 2008-05-06 | Hrl Laboratories, Llc | Smart chaff |
-
1980
- 1980-08-21 GB GB8027200A patent/GB2082862B/en not_active Expired
-
1981
- 1981-08-20 CA CA000384255A patent/CA1170338A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB2082862A (en) | 1982-03-10 |
| GB2082862B (en) | 1984-03-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |