EP0605356B1 - Self-destructive electronic fuse - Google Patents
Self-destructive electronic fuse Download PDFInfo
- Publication number
- EP0605356B1 EP0605356B1 EP93500177A EP93500177A EP0605356B1 EP 0605356 B1 EP0605356 B1 EP 0605356B1 EP 93500177 A EP93500177 A EP 93500177A EP 93500177 A EP93500177 A EP 93500177A EP 0605356 B1 EP0605356 B1 EP 0605356B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuse
- self
- electronic
- destructive
- subammunition
- 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 - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C9/00—Time fuzes; Combined time and percussion or pressure-actuated fuzes; Fuzes for timed self-destruction of ammunition
- F42C9/14—Double fuzes; Multiple fuzes
- F42C9/147—Impact fuze in combination with electric time fuze
Definitions
- the present invention relates to a self-destructive electronic fuse.
- This self-destructive electronic fuse acts, by means of an inertia switch when the ammunition hits the target or if there is no hit or such takes place at an inappropriate angle, after a set time, so as to destroy itself and cause the ammunition to which it is attached to explode.
- CH-A-534 860 on which document the preamble of independent claim 1 is based discloses a self-destructive electronic fuse having an impact switch for actuating the fuse upon an impact.
- the fuse comprises a timing circuit for actuating the fuse and, hence, the ammunition, after a certain time interval after launching of the ammunition, in order to achieve a self-destruction in case no impact occurs.
- the fuse is provided with an acceleration switch serving as pre-launching safety measure, which acceleration switch applies voltage to the actuation circuit after closure.
- US-A-3 815 505 discloses a self-destructing apparatus for impact-detonating explosive devices. After firing or dropping of the explosive device, the detonator is actuated after a predetermined time delay so as to ensure self-destruction of the device in case of lack of prior explosion.
- US-H-136 discloses a fuse for a grenade which is provided with an electrical backup system for detonating the grenade for self-destruction in case no prior detonation should take place.
- the present invention provides a self-destructive electronic fuse in accordance with claim 1.
- the fuse of the invention is light in weight, small in size, compact, capable of resisting a sharp acceleration and specially designed to be used in subammunition using a projectile opening up in the air as a carrier vector.
- the fuse Upon firing, from the time the power supply is connected, the fuse receives an electric power supply that is stored. When the fuse is disconnected from the power supply, two timers are switched on, one of which works as a distance interrupter preventing the instantaneous actuation of the fuse and the other, in the event that the fuse should not act upon a hit, activates the elements causing the same to destroy itself.
- Figure 1 shows the fuse and the subammunition together at rest.
- Figure 2 shows the fuse and the subammunition together in flight.
- Figure 3 shows the electronic fuse circuit
- the self-destructive fuse (Fig. 1) comprises mechanical and electronic components working together.
- a frame (1) a frame (2) and a printed circuit (100) fitted with the electronic components.
- the body (2) is used to couple the fuse to a subammunition (4) and houses inside a centre stop (5) for an electric detonator (120).
- a guide (7) fitted with a stopper disc (8), slides along the centre stop (5) when it is released from the abutment that prevents it from moving, the abutment being in this case another subammunition (4).
- the stopper disc (8) When at rest, the stopper disc (8) provides a barrier between the electric detonator (120) welded to the printed circuit (100) and the subammunition (4), thereby preventing a chance detonation of the electric detonator (120) from causing the subammunition (4) to explode.
- the electric detonator (120) In order to enhance contact of the electric detonator (120) with the printed circuit (100), the electric detonator (120) is surrounded by and in contact with a spring (10).
- the contact disc (12) acts as an inertia switch (112) for when the subammunition (4) hits the target, the deceleration caused by such hit folds the contact disc (12) and when a contact (13) welded to the top printed circuit (121) simultaneously touches a washer (14) the electronic circuit is made and the detonator (120) detonates, thereby causing the subammunition (4) to explode.
- the fuse In order to enable the subammunition (4) to arrive at the target vertically, the fuse, by means of a stay (21) and a pin (22), is coupled with a band (23), with a curved reinforcement (24), that is rolled over the fuse body (2) before firing and after firing (Fig. 2) acts as a parachute causing the subammunition (4) to brake aerodynamically.
- the cable (101), (102) and (103) connections disappear when the subammunition items (4) are released from one another upon firing.
- It has a storage condenser (105) storing the power received from the external electric power supply (200), which power returns to the circuit when the fuse is disconnected from the outer power supply (200).
- analogue switches (106) and (107) are powered through a diode (118).
- the analogue switch (110) controls powering of an inertia switch (112).
- the drive transistor (113) stays set by a bias resistor (117) and when its base is powered, it drives the electric detonator (320) causing it to detonate, which in turn causes the subammunition (4) to explode.
- the subammunition items (4) are at rest, supported by and fitted to each other and with their self-destructive fuses all connected to each other, and further with the short-circuit cable connected to the negative power cable.
- the loading stage begins upon firing and when the power supply (200) is triggered, powering the fuse though the contact (104) and the power cables (101) and (102).
- the storage condenser (105) When the fuse is powered, the storage condenser (105) is charged, storing energy.
- the load condition is stable while there is a powering and the detonator (120) remains short-circuited through the short-circuit cable (103).
- the tripping state begins when the fuse is disconnected from the storage condenser (105) charged from the power supply and occurs when the subammunition (4) is sent off.
- the analogue switches (106) and (107) are turned off for their control line is reset through the resistor (114) and the diode (119) prevents the storage condenser (105) from driving the line.
- the power stored in the storage condenser (105) is used to begin charging the delay condensers (108) and (109) through the delay resistors (115) and (116) calculated for the charge level in the delay condensers (108) and (109) to cause the analogue switches (110) and (111) to be switched over with different timings.
- the delay resistor (115) and the condenser (108) act as a distance interrupter and are calculated for the analogue switch (110) to be turned on when the flight of the subammunition (4) is already stable.
- the inertia switch (112) When the analogue switch (110) is turned on, the inertia switch (112) is powered, and hence when the ammunition hits the target, due to the deceleration effect there is, the contact disc (12) folds and turns the inertia switch (112) on.
- the drive transistor base (113), that remained set by action of the bias resistor (117), is powered, and the electric detonator (120) detonates and causes the subammunition (4) to explode.
- the fuse If the fuse is not actuated upon a hit, because the ammunition may be hanging from the branch of a tree, it may have been tipped by a nearby explosion or otherwise, after a preset time controlled by the resistor (116) and the condenser (109), sufficient for the subammunition (4) to have already arrived at the target, the analogue switch (111) shall be turned on.
- the drive transistor base (113) When the analogue switch (111) is turned on, the drive transistor base (113) will be powered and the electric detonator (120) detonated and the fuse will destroy itself and with it the subammunition (4) to which it is attached.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Fuses (AREA)
- Servomotors (AREA)
- Air Bags (AREA)
- Credit Cards Or The Like (AREA)
- Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)
- Saccharide Compounds (AREA)
- Semiconductor Integrated Circuits (AREA)
Abstract
Description
Claims (6)
- A self-destructive electronic fuse comprising mechanical and electronic elements, and used in a subammunition items with the mechanical elements (7, 8, 12) providing safety features and hit detection, characterized in that the electronic elements (101 to 120) are providing a double timing (108, 109, 115, 116), both starting when the subammunition items (4) are released: the first timing (108, 115) preventing instantaneous operation of the fuse, and the second timing (109, 116), larger than the first, ensuring that self-destruction will only take place if operation by a hit fails.
- A self-destructive electronic fuse, as in claim 1, characterized in that its mechanical elements include a frame (1), body (2), stop (5), centre, guide (7), contact disc (8) and band (23), allowing the electronic components to be coupled to the fuse to work upon an impact.
- A self-destructive electronic fuse, as in claim 1 or 2, characterized in having an electronic circuit, fitted with a printed circuit (100), comprising diodes, capacitors, resistors, analogue switches, an analogue transistor and an electronical detonator (120), which circuit allows the fuse to work by a hit or by self-destruction.
- A self-destructive electronic fuse, as in claim 3, characterized in that the detonator (120) is short-circuited thereby to prevent operation of the fuse during transport and handling of the ammunition.
- A self-destructive electronic fuse, as in claim 3 or 4, characterized in that a spring (10) is provided to improve the electric connection of the detonator (120).
- A self-destructive electronic fuse, as in claims 1, 2, 3, 4 or 5, characterized in that a guide (7) is provided having a stopper disc (8) preventing the operation thereof until the guide (7) moves.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES09202659A ES2068738B1 (en) | 1992-12-30 | 1992-12-30 | SELF-DESTRUCTIVE ELECTRONIC SPOOL. |
ES9202659 | 1992-12-30 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0605356A1 EP0605356A1 (en) | 1994-07-06 |
EP0605356B1 true EP0605356B1 (en) | 1998-06-03 |
Family
ID=8279278
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93500177A Expired - Lifetime EP0605356B1 (en) | 1992-12-30 | 1993-12-29 | Self-destructive electronic fuse |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0605356B1 (en) |
AT (1) | ATE166964T1 (en) |
DE (1) | DE69318960T2 (en) |
ES (1) | ES2068738B1 (en) |
GR (1) | GR3027619T3 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9450636B2 (en) | 2014-12-30 | 2016-09-20 | Motorola Solutions, Inc. | Intrinsically safe audio power current circuit and device using same |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IL121428A (en) * | 1997-07-30 | 2003-01-12 | Israel Military Ind | Self-destruct fuze for submunition grenade |
ES2174661B1 (en) * | 1999-02-22 | 2004-08-16 | Instalaza, S.A. | IMPROVEMENTS INTRODUCED IN SELF-DESTRUCTIVE ELECTRONIC SPOOLS. |
CN112270021B (en) * | 2020-09-23 | 2024-03-26 | 成都三零嘉微电子有限公司 | Wireless self-destruction control circuit and method for security chip |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1948381C2 (en) * | 1969-09-25 | 1982-08-12 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Detonator for the explosive charge of a projectile |
NL7216146A (en) * | 1972-11-28 | 1974-05-30 | ||
ES513271A0 (en) * | 1982-06-18 | 1983-11-16 | Talleres Biabi | IMPROVEMENTS INTRODUCED IN THE IGNITION SYSTEMS OF THE WARMER PUMPS. |
USH136H (en) * | 1985-10-23 | 1986-10-07 | The United States Of America As Represented By The Secretary Of The Army | Electrically detonated grenade |
-
1992
- 1992-12-30 ES ES09202659A patent/ES2068738B1/en not_active Expired - Fee Related
-
1993
- 1993-12-29 DE DE69318960T patent/DE69318960T2/en not_active Expired - Fee Related
- 1993-12-29 EP EP93500177A patent/EP0605356B1/en not_active Expired - Lifetime
- 1993-12-29 AT AT93500177T patent/ATE166964T1/en not_active IP Right Cessation
-
1998
- 1998-08-07 GR GR980401797T patent/GR3027619T3/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9450636B2 (en) | 2014-12-30 | 2016-09-20 | Motorola Solutions, Inc. | Intrinsically safe audio power current circuit and device using same |
Also Published As
Publication number | Publication date |
---|---|
DE69318960T2 (en) | 1999-03-04 |
ES2068738A2 (en) | 1995-04-16 |
GR3027619T3 (en) | 1998-11-30 |
ATE166964T1 (en) | 1998-06-15 |
EP0605356A1 (en) | 1994-07-06 |
ES2068738B1 (en) | 1998-05-01 |
DE69318960D1 (en) | 1998-07-09 |
ES2068738R (en) | 1997-05-16 |
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