US3343487A - Pyrotechnic delay device for mild detonating fuze - Google Patents
Pyrotechnic delay device for mild detonating fuze Download PDFInfo
- Publication number
- US3343487A US3343487A US515705A US51570565A US3343487A US 3343487 A US3343487 A US 3343487A US 515705 A US515705 A US 515705A US 51570565 A US51570565 A US 51570565A US 3343487 A US3343487 A US 3343487A
- Authority
- US
- United States
- Prior art keywords
- delay
- mild detonating
- washer
- fuze
- case
- 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
- 239000000203 mixture Substances 0.000 claims description 22
- 239000002360 explosive Substances 0.000 claims description 11
- 238000005474 detonation Methods 0.000 claims description 5
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 4
- YADSGOSSYOOKMP-UHFFFAOYSA-N dioxolead Chemical compound O=[Pb]=O YADSGOSSYOOKMP-UHFFFAOYSA-N 0.000 description 4
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 150000001540 azides Chemical class 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 230000001934 delay Effects 0.000 description 2
- 229910000464 lead oxide Inorganic materials 0.000 description 2
- WETZJIOEDGMBMA-UHFFFAOYSA-L lead styphnate Chemical compound [Pb+2].[O-]C1=C([N+]([O-])=O)C=C([N+]([O-])=O)C([O-])=C1[N+]([O-])=O WETZJIOEDGMBMA-UHFFFAOYSA-L 0.000 description 2
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 2
- 235000010333 potassium nitrate Nutrition 0.000 description 2
- 239000004323 potassium nitrate Substances 0.000 description 2
- 229910001928 zirconium oxide Inorganic materials 0.000 description 2
- TZRXHJWUDPFEEY-UHFFFAOYSA-N Pentaerythritol Tetranitrate Chemical compound [O-][N+](=O)OCC(CO[N+]([O-])=O)(CO[N+]([O-])=O)CO[N+]([O-])=O TZRXHJWUDPFEEY-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004200 deflagration Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C06—EXPLOSIVES; MATCHES
- C06C—DETONATING OR PRIMING DEVICES; FUSES; CHEMICAL LIGHTERS; PYROPHORIC COMPOSITIONS
- C06C5/00—Fuses, e.g. fuse cords
- C06C5/06—Fuse igniting means; Fuse connectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B3/00—Blasting cartridges, i.e. case and explosive
- F42B3/02—Blasting cartridges, i.e. case and explosive adapted to be united into assemblies
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/04—Arrangements for ignition
- F42D1/06—Relative timing of multiple charges
Definitions
- a relay element including a case open at either end for insertion of two ends of mild detonating fuze. Included in the remaining portion of said case is a lead tube which houses a delay column. Adjacent each end of said delay column is a vented washer containing a gasless igniter mixture. Adjacent the aforesaid washer is a second vented washer containing a primary explosive composition which is separated from the ends of the mild detonating fuze by a paper disc.
- the present invention relates to a pyrotechnic delay device for mild detonating fuze and more particularly to a pyrotechnic delay device for introducing delay times of several seconds into mild detonating fuze lines.
- a device of this type is used mainly in aircraft emergency escape systems.
- Such systems employ a mild detonating fuze, referred to hereinafter as MDF, as the energy transfer medium between cartridge activated devices.
- MDF mild detonating fuze
- the sequencing of various functions in the escape system, i.e. canopy removal, seat ejection, etc. are such that delays in time are required between successive functions.
- the nature of the invention is such that it can be fitted between two MDF segments, causing a selected time delay upon system initiation.
- Environmental conditions i.e. temperature, pressure, humidity, chemical reaction, etc. dictate that the delay composition be completely sealed from the environment.
- the invention satisfies this condition in that the delay train and adjacent explosives are completely surrounded by the body of the invention before, during and even after firing.
- Another object is the provision of a pyrotechnic delay device for mild detonating fuze which is completely sealed from the environment.
- MDF 12 mild detonating fuze
- Said MDF 12 being a waterproofed, braided-fabric covered metallic tubing having a core of high explosive, such as PETN, RDX, or some other suitable composition. Both ends of the MDF 12 are inserted into the case 14 where they are maintained in place by crimps 16 at either end.
- Adjacent to both MDF ends 12 are two paper disks 18, which cover a primary explosive mixture 20, which could be lead azide or lead styphnate, contained in a washer 22 vented at 24.
- the column of delay composition 30 is housed in a lead tube 32.
- detonation of the high explosive core 34 in the MDF 12 proceeds in either direction to the paper disk 18, where sufiicient energy is transferred to the primary explosive mixture 20 to cause detonation of same.
- Energy from the detonation of the primary explosive is transferred through the vent 24 in washer 22 to the gasless igniter mixture 26, which is ignited.
- Heat transfer to the delay composition 30 effects deflagration of the delay column.
- the reverse sequence of energy transferred from the delay column to the MDF is in the reverse order to that described above.
- a pyrotechnic delay device for mild detonating fuze including a delay element comprising a case open at either end,
- a device of the type described in claim 1 wherein said primary explosive composition is lead styphnate.
- a device of the type described in claim 1 wherein said gasless igniter mixture is zirconium/ lead dioxide.
- a device of the type described in claim 1 including crimps on each end of said case for securing thereto the ends of said mild detonating fuze.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Air Bags (AREA)
Description
se zs, 1967 HAREYJR. ETAL 3,343,487
PYROTECHNIC DELAY DEVICE FOR MILD DETONATING FUZE Filed Dec. 22, 1965 j wuowtm GEORGE F. HARE, JR. JAMES F. KOWALICK m yzikw United States Patent 3 343,487 PYROTECHNIC DELAY DEVICE FOR MILD DETONATING FUZE George F. Hare, Jr., Feasterville, and James F. Kowalick, South Hampton, Pa., assignors t the United States of America as represented by the Secretary of the Army Filed Dec. 22, 1965, Ser. No. 515,705 7 Claims. (Cl. 10227) ABSTRACT OF THE DISCLOSURE A relay element including a case open at either end for insertion of two ends of mild detonating fuze. Included in the remaining portion of said case is a lead tube which houses a delay column. Adjacent each end of said delay column is a vented washer containing a gasless igniter mixture. Adjacent the aforesaid washer is a second vented washer containing a primary explosive composition which is separated from the ends of the mild detonating fuze by a paper disc.
The invention described herein may be manufactured and used by or for the Government for governmental purposes without the payment to us of any royalty thereon.
The present invention relates to a pyrotechnic delay device for mild detonating fuze and more particularly to a pyrotechnic delay device for introducing delay times of several seconds into mild detonating fuze lines.
A device of this type is used mainly in aircraft emergency escape systems. Such systems employ a mild detonating fuze, referred to hereinafter as MDF, as the energy transfer medium between cartridge activated devices. The sequencing of various functions in the escape system, i.e. canopy removal, seat ejection, etc. are such that delays in time are required between successive functions.
The nature of the invention is such that it can be fitted between two MDF segments, causing a selected time delay upon system initiation. Environmental conditions, i.e. temperature, pressure, humidity, chemical reaction, etc. dictate that the delay composition be completely sealed from the environment. The invention satisfies this condition in that the delay train and adjacent explosives are completely surrounded by the body of the invention before, during and even after firing.
Previous delays of this type as described in US. Patent No. 2,736,263 function only with common detonating cord or Cordeau fuze, do not remain intact, and only affect delay trains of up to .300 milliseconds.
It is therefore an object of the present invention to provide a pyrotechnic delay device for mild detonating fuze having delay times of up to 15 seconds.
Another object is the provision of a pyrotechnic delay device for mild detonating fuze which is completely sealed from the environment.
The above objects as well as others together with the benefits and advantages of the invention will be apparent upon reference to the detailed description set forth below, particularly when taken in conjunction with the drawing annexed hereto in which is shown a delay element 10 separating a length of mild detonating fuze (MDF) 12. Said MDF 12 being a waterproofed, braided-fabric covered metallic tubing having a core of high explosive, such as PETN, RDX, or some other suitable composition. Both ends of the MDF 12 are inserted into the case 14 where they are maintained in place by crimps 16 at either end. Adjacent to both MDF ends 12 are two paper disks 18, which cover a primary explosive mixture 20, which could be lead azide or lead styphnate, contained in a washer 22 vented at 24. A gas-less igniter mixture 26, which could be boron/potassium nitrate, Zirconium/lead oxide or zirconium/lead dioxide, is adjacent to the vent 24 in the washer 22, and is contained in a second washer 28 which rests on either end of a column of any suitable known delay composition 30. The column of delay composition 30 is housed in a lead tube 32.
In operation, detonation of the high explosive core 34 in the MDF 12, proceeds in either direction to the paper disk 18, where sufiicient energy is transferred to the primary explosive mixture 20 to cause detonation of same. Energy from the detonation of the primary explosive is transferred through the vent 24 in washer 22 to the gasless igniter mixture 26, which is ignited. Heat transfer to the delay composition 30 effects deflagration of the delay column. The reverse sequence of energy transferred from the delay column to the MDF is in the reverse order to that described above.
Obviously many modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood, that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described.
We claim:
1. A pyrotechnic delay device for mild detonating fuze including a delay element comprising a case open at either end,
means for securing the ends of said case to the ends of said mild detonation fuze,
a lead tube contained in said case, containing a column of delay composition,
a paper disc adjacent to each end of said mild detonating fuze within said case,
a first vented washer adjacent said paper discs,
a primary explosive composition contained within said vented washer,
a second vented washer between said first vented Washer and said lead tube, and
a gasless igniter mixture contained within said second vented washer.
2. A device of the type described in claim 1 wherein said primary explosive composition is lead azide.
3. A device of the type described in claim 1 wherein said primary explosive composition is lead styphnate.
4. A device of the type described in claim 1 wherein said gasless igniter mixture is boron/ potassium nitrate.
5. A device of the type described in claim 1 wherein said gasless igniter mixture is zirconium/lead oxide.
6. A device of the type described in claim 1 wherein said gasless igniter mixture is zirconium/ lead dioxide.
7. A device of the type described in claim 1 including crimps on each end of said case for securing thereto the ends of said mild detonating fuze.
References Cited UNITED STATES PATENTS 2,736,263 2/1956 Lewis et al. 102-27 3,135,200 6/1964 Jackson 10228 3,150,020 9/1964 Kilmer 14937 SAMUEL W. ENGLE, Primary Examiner. BENJAMIN A. BORCHELT, Examiner. V. R. PENDEGRASS, Assistant Examiner.
Claims (1)
1. A PYROTECHNIC DELAY DEVICE FOR MILD DETONATING FUZE INCLUDING A DELAY ELEMENT COMPRISING A CASE OPEN AT EITHER END, MEANS FOR SECURING THE ENDS OF SAID CASE TO THE ENDS OF SAID MILD DETONATION FUZE, A LEAD TUBE CONTAINED IN SAID CASE, CONTAINING A COLUMN OF DELAY COMPOSITION, A PAPER DISC ADJACENT TO EACH END OF SAID MILD DETONATING FUZE WITHIN SAID CASE, A FIRST VENTED WASHER ADJACENT SAID PAPER DISCS, A PRIMARY EXPLOSIVE COMPOSITION CONTAINED WITHIN SAID VENTED WASHER, A SECOND VENTED WASHER BETWEEN SAID FIRST VENTED WASHER AND SAID LEAD TUBE, AND A GASLESS IGNITER MIXTURE CONTAINED WITHIN SAID SECOND VENTED WASHER.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US515705A US3343487A (en) | 1965-12-22 | 1965-12-22 | Pyrotechnic delay device for mild detonating fuze |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US515705A US3343487A (en) | 1965-12-22 | 1965-12-22 | Pyrotechnic delay device for mild detonating fuze |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3343487A true US3343487A (en) | 1967-09-26 |
Family
ID=24052406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US515705A Expired - Lifetime US3343487A (en) | 1965-12-22 | 1965-12-22 | Pyrotechnic delay device for mild detonating fuze |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US3343487A (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3427975A (en) * | 1967-06-27 | 1969-02-18 | Us Army | Anti-pillaring white phosphorus projectile |
| US3698183A (en) * | 1971-06-01 | 1972-10-17 | Us Army | Initiator booster |
| US3895577A (en) * | 1973-09-25 | 1975-07-22 | Hercules Inc | Long burning delay blasting caps |
| US4141296A (en) * | 1976-11-11 | 1979-02-27 | Austin Powder Company | Carrier for explosive primer and method of using same |
| USRE30621E (en) * | 1980-04-16 | 1981-05-26 | Austin Powder Company | Carrier for explosive primer and method of using same |
| US4350097A (en) * | 1980-05-19 | 1982-09-21 | Atlas Powder Company | Nonelectric delay detonator with tubular connecting arrangement |
| US4716831A (en) * | 1986-11-03 | 1988-01-05 | The Ensign-Bickford Company | Detonating cord connector |
| US4730560A (en) * | 1986-10-03 | 1988-03-15 | The Ensign-Bickford Company | Combination blasting signal transmission tube connector and delay assembly |
| US4742773A (en) * | 1986-10-03 | 1988-05-10 | The Ensign-Bickford Company | Blasting signal transmission tube delay unit |
| US4771694A (en) * | 1986-08-19 | 1988-09-20 | The Ensign-Bickford Company | Blasting signal transmission tube connector |
| US4911076A (en) * | 1987-11-11 | 1990-03-27 | Aeci Limited | Time delay replay |
| US5147976A (en) * | 1990-07-27 | 1992-09-15 | Giat Industries | Ignition system for a pyrotechnic composition |
| US20030200891A1 (en) * | 2002-04-25 | 2003-10-30 | Yu Peter Sung Yan | Fireworks fuse connector |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2736263A (en) * | 1956-02-28 | Blasting explosive device | ||
| US3135200A (en) * | 1964-05-27 | 1964-06-02 | Hi Shear Corp | Squib |
| US3150020A (en) * | 1963-10-29 | 1964-09-22 | Earl E Kilmer | Gasless igniter composition |
-
1965
- 1965-12-22 US US515705A patent/US3343487A/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2736263A (en) * | 1956-02-28 | Blasting explosive device | ||
| US3150020A (en) * | 1963-10-29 | 1964-09-22 | Earl E Kilmer | Gasless igniter composition |
| US3135200A (en) * | 1964-05-27 | 1964-06-02 | Hi Shear Corp | Squib |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3427975A (en) * | 1967-06-27 | 1969-02-18 | Us Army | Anti-pillaring white phosphorus projectile |
| US3698183A (en) * | 1971-06-01 | 1972-10-17 | Us Army | Initiator booster |
| US3895577A (en) * | 1973-09-25 | 1975-07-22 | Hercules Inc | Long burning delay blasting caps |
| US4141296A (en) * | 1976-11-11 | 1979-02-27 | Austin Powder Company | Carrier for explosive primer and method of using same |
| USRE30621E (en) * | 1980-04-16 | 1981-05-26 | Austin Powder Company | Carrier for explosive primer and method of using same |
| US4350097A (en) * | 1980-05-19 | 1982-09-21 | Atlas Powder Company | Nonelectric delay detonator with tubular connecting arrangement |
| US4771694A (en) * | 1986-08-19 | 1988-09-20 | The Ensign-Bickford Company | Blasting signal transmission tube connector |
| US4730560A (en) * | 1986-10-03 | 1988-03-15 | The Ensign-Bickford Company | Combination blasting signal transmission tube connector and delay assembly |
| US4742773A (en) * | 1986-10-03 | 1988-05-10 | The Ensign-Bickford Company | Blasting signal transmission tube delay unit |
| US4716831A (en) * | 1986-11-03 | 1988-01-05 | The Ensign-Bickford Company | Detonating cord connector |
| US4911076A (en) * | 1987-11-11 | 1990-03-27 | Aeci Limited | Time delay replay |
| US5147976A (en) * | 1990-07-27 | 1992-09-15 | Giat Industries | Ignition system for a pyrotechnic composition |
| US20030200891A1 (en) * | 2002-04-25 | 2003-10-30 | Yu Peter Sung Yan | Fireworks fuse connector |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3062147A (en) | Igniter for solid propellant grains | |
| US5786544A (en) | Warhead protection device during slow cook-off test | |
| US4664033A (en) | Pyrotechnic/explosive initiator | |
| US3343487A (en) | Pyrotechnic delay device for mild detonating fuze | |
| US3238876A (en) | Method for through-bulkhead shock initiation | |
| US3945322A (en) | Through-bulkhead explosion initiation | |
| RU2042102C1 (en) | Delay unit for device transmitting blasting signal | |
| US6308607B1 (en) | Neutralizing munition | |
| GB1448931A (en) | Warhead | |
| US5198615A (en) | Fuzing system for tandem demolition warheads | |
| Kilmer | Heat-resistant explosives for space applications. | |
| US4406226A (en) | Non-electric delay blasting method | |
| US5099761A (en) | Laser actuated thru-bulkhead initiator | |
| US5179246A (en) | Laser actuated thru-bulkhead initiator for detonable explosive material, pyrotechnic material and remotely located pyrotechnic or propellant material | |
| US3162127A (en) | Delay train for fuze | |
| US2996007A (en) | Explosive train | |
| US5347931A (en) | Combustible flare ignition system | |
| US4270455A (en) | Blasting cap booster assembly | |
| SE8005437L (en) | DETONATOR WITHOUT INITIAL EXPLOSION FOR ELECTRICAL IGNITION OF THE EXPLOSIVE SUBSTANCE, SPECIFIC EXPLOSIVES | |
| US6227095B1 (en) | Insensitive munition booster seal | |
| US4132170A (en) | Fuel-air type bomb | |
| US3965951A (en) | Single chemical electric detonator | |
| US3103884A (en) | Cartridge for more nearly uniform projectile velocities | |
| US3331324A (en) | Frangible motor | |
| US6360526B2 (en) | Rocket motor with desensitizer injector |