US3707917A - Precision initiation coupler - Google Patents
Precision initiation coupler Download PDFInfo
- Publication number
- US3707917A US3707917A US00091664A US3707917DA US3707917A US 3707917 A US3707917 A US 3707917A US 00091664 A US00091664 A US 00091664A US 3707917D A US3707917D A US 3707917DA US 3707917 A US3707917 A US 3707917A
- Authority
- US
- United States
- Prior art keywords
- explosive
- detonation
- coupler
- charge
- shaped
- 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
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/04—Arrangements for ignition
- F42D1/043—Connectors for detonating cords and ignition tubes, e.g. Nonel tubes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C19/00—Details of fuzes
- F42C19/08—Primers; Detonators
- F42C19/0807—Primers; Detonators characterised by the particular configuration of the transmission channels from the priming energy source to the charge to be ignited, e.g. multiple channels, nozzles, diaphragms or filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C19/00—Details of fuzes
- F42C19/08—Primers; Detonators
- F42C19/0838—Primers or igniters for the initiation or the explosive charge in a warhead
Definitions
- PRECISION INITIATION COUPLER [75] Inventors: Louis Zernow, Glendora, Arthur Louis Mottet, Pacific Palisades, both of Calif.
- ABSTRACT A device for funneling a detonation wave from a detonator to a main explosive charge to substantially eliminate the detrimental effects of axial misalignment of the detonator and main explosive charge, comprising a detonation-confining body carrying therein a generally l-shaped explosive extending axially through it. The device is placed between a detonator and main charge and in axial alignment with the latter.
- a detonation wave from the detonator may be eccentrically received by one end of the I-shaped explosive, but it is funnelled down the column of the l, which is in axial alignment with the main charge, so that the latter sees” an axially-aligned detonation wave emanating from the other end of the l.
- the explosive, the material forming the detonation-confining body and the dimensions of the I-shaped charge are selected to insure that there is substantially no interference with the detonation of the l-shaped explosive, to preferably maximize the detonation velocity through the explosive, and to ensure that detonation of the main explosive is initiated from the I-shaped explosive and not from the confining body.
- This invention is embodied in a precision initiation coupler which is designed to be placed between a detonator and a main charge to correct any misalignment of the axes of the detonator and main charge which could reduce the effectiveness of the output of the main charge.
- This invention can be employed with any combination of explosive charges where the effectiveness of the combination of charges is dependent on alignment of the axes of the charges making up the combination.
- this invention at present, has particular utility when employed with shaped charge ammunition.
- the invention comprises a detonation-confining body having an I-shaped cavity formed therein and extending through the confining body.
- the cavity is axially aligned with the axis of the confining body and is filled with an explosive to provide an explosive charge with an I-shaped configuration.
- the precision initiation coupler is axially aligned with the main charge and, when in this position, is not axially aligned with a misaligned detonator.
- the particular 1- configuration of the explosive in the coupler is such that the eccentric detonation wave from the detonator is received and transmitted by one end of the I-shaped charge through the web or column section of the I which is axially aligned with the main charge. The detonation wave is thus axially transmitted through the other end of the I-shaped charge and this, in turn, produces axially aligned detonation of the main charge.
- the advantage of employing the precision initiation coupler of this invention is that it can substantially eliminate the effect of misalignments between detonators and main charges which the former are employed to detonate. For example, it can reduce detonator input eccentricities to the coupler as large as 0.150 inches to coupler outputs having a residual eccentricity of 0.01 inches and less.
- This alignment correction is accompanied by a substantial increase in main charge effectiveness and this increase in effectiveness may be as much as 30 percent or more depending upon the particular application.
- Use of the herein-described coupler also eliminates the necessity of employing close tolerances in fuzing systems thereby reducing the cost of such systems normally associated with the maintenance of close tolerances.
- FIG. 1 is a perspective view of the precision initiation coupler of this invention.
- FIG. 2 is an elevational sectional view of the coupler of FIG. 1 taken along the line 2-2 of FIG. 1.
- FIG. 3 is an elevational sectional view of a simplified shaped charge system illustrating the use of the hereindescribed coupler in combination with a fuze body and a shaped charge.
- the coupler 10 designates a precision initiation coupler of this invention.
- the coupler 10 comprises a normally cylindrical body 12 which is provided with an axially aligned cavity 14.
- the cavity 14 has a generally I-shaped configuration. As shown in FIGS. 1 and 2, the cavity 14 is symmetrical about its transverse axis. However, it need not be as will be further described hereafter.
- the cavity 14 comprises a pair of expanded-diameter, normally-circular, end sections 16,18 which open through upper and lower faces 20,22, respectively in the coupler body 12 and which are in communication with each other through a channel 24 of circular crosssection and substantially smaller diameter.
- the walls of the channel 24 at their juncture with the walls of the cavity end sections 16,18 are preferably tapered to facilitate filling of the cavity 14 and to continue detonation upon emergence. Detonation may become extinguished if gradual emergence provided.
- the cavity 14 is shown as symmetrical about its transverse axis. This is preferred because the coupler 10 can be oriented to make either end the input end. However, it is not essential as will be further described hereafter.
- the cavity 14 is filled with an explosive, such as RDX (cyclonite), PETN (pentaerythritol tetranitrate) and tetryl, so that a generally I-shaped explosive charge 26 conforming to the configuration of the cavity 14 is formed within, and coaxial with, the coupler body 12.
- the explosive charge 26 comprises upper and lower, disc-shaped flange sections 28,30, respectively, which are interconnected by a column 32.
- the upper flange 28 has an exposed face 34 which receives detonation waves from a detonator which causes initiation of the explosive in the upper flange section 28.
- the detonation front from the latter is transmitted through the column 32 to the lower flange section 30, which, in turn, serves to detonate any explosive adjacent to its exposed face 38.
- the point of initiation at the face 34 of the upper flange section 28 may be eccentric with respect to the longitudinal or detonation axis of the l-shaped charge 26, it is funnelled through the axially-aligned column 32 to emerge at the face 38 of the lower flange section 30 with substantially no eccentrici-
- the dimensions of the I-shaped explosive charge 26, and thus of the cavity 14, are determined by a number of variables which, to some extent, are unique to each application.
- the I-shaped charge 26 is, therefore, essentially tailored to meet the requirements of each application.
- the upper flange section 28 of the I-shaped charge 26 is the input end, its diameter must be sufficient to provide an area of the exposed face 34 so that the latter can accept inputs from a wide range of possible displacements of a point of initiation on its surface from the longitudinal axis of the l-shaped charge.
- the size of the lower flange section 30 is determined by its ability to provide an adequate input to the explosive charge, e.g., a booster charge, adjacent to it. That is, it must be sufficiently large to ensure good initiation of the booster or main charge where this device may be employed as the booster. its size will thus depend upon the type of explosive employed in the I-shaped charge 26, the explosive which is to be detonated, and the efficiency with which it, itself, is detonated. It will be understood that since different parameters govern the sizes of the upper and lower flange sections 28,30, they may be of different size and the l-shaped charge 26 need not be symmetrical about its transverse axis.
- the diameter of the column 32 of the l-shaped charge 26 should be large enough to propogate the detonation wave from the upper flange section 28 to thereby cause initiation of the lower flange section 30. This will be a function of the type of explosive employed in the l-shaped charge 26 and the confinement provided by the material forming the coupler body 12. In general, the greater the degree of confinement, the smaller the diameter of the column 32 that can be used.
- the length of the column 32 is preferably as long as possible for a given length of I-shaped charge 26 to reduce the total amount of explosive in the precision initiation coupler in order to reduce shock transfer through the coupler body 12 which can have deleterious effects as described hereafter.
- a high detonation velocity through the explosive in the l-shaped charge 26 is preferred to ensure that detonation of the explosive next to be detonated, e.g., a booster, results only from detonation of the l-shaped charge 26 and to ensure that the output of the l-shaped charge is maximized.
- the material forming the coupler body 12 is preferably selected so that the detonation front is substantially confined to the explosive in the lshaped charge, that is, so that shock waves, from the explosive detonation, through the coupler body material are minimized.
- the material forming the coupler body 12 may be a metal such as steel or aluminum, or a plastic such as a microballoon filled phenolic. At present, it is preferable to employ steel as the coupler body material since this provides excellent detonation confinement.
- the precision initiation coupler 10 is placed between a detonator and a main charge.
- the coupler 10 is normally placed between a detonator and a booster which, in turn, serves to detonate a main charge.
- a fuze body 40 is placed adjacent a booster cup 42 which, in turn, is placed against a main explosive charge 44, such as a shaped charge.
- the fuze body 40 contains, in simplified form, a firing pin 46 and, a detonator charge 48 (which may consist of a plurality of charges).
- the precision initiation coupler 10 may be positioned within the fuze body 40 or it may be positioned within the booster cup 42 as shown in FIG. 3.
- the booster cup 42 is divided into two sections with the coupler 10 in one section and a booster pellet 50 in the other section.
- the side walls of the booster cup 42 automatically align the detonation axis 52 of the coupler 10 with the detonation axis 54 of the booster pellet 50 which, in turn, is axially aligned with the main charge 44, whereas, the coupler 10 is usually not in alignment with the detonation axis 56 of the detonator 48 in the fuze body 40 due to machining limitations and tolerances.
- the axis of the detonator 48 terminates within the area of the exposed face 34 of the lshaped charge 26 so that the detonation wave from the detonator first impinges on the coupler 10 within that area.
- a force impacts the front end of the warhead causing the firing pin 46 to strike the detonator 48 to cause initiation of the latter.
- the resulting detonation wave eccentrically initiates detonation of the explosive in the l-shaped charge 26 due to the fuze body-booster cup misalignment.
- the explosive detonation wave is forced to travel down the axially-aligned column 32 so that the lower flange section 30 of the l-shaped charge sees only a substantially axially-aligned output from the l-shaped charge 26 to the booster pellet 50.
- a precision initiation coupler was made up as shown in FIGS. 1 and 2.
- the coupler body was formed from steel and was provided with a thickness of 0.290 in. and a diameter of 0.750 inches.
- the cavity and, thus, the I- shaped charge had the following dimensions: diameter of upper and lower end sections 0.4 in.; diameter of channel at its thinnest section 0.050 inches; and depth of upper and lower end sections (flange thickness) 0.075 inches.
- the l-shaped charge was formed from pressed RDX.
- the coupler was placed in an assembly as shown in FIG. 3 except that no main charge was present.
- the misalignment of the detonator input to the coupler with respect to the longitudinal axis of the latter was 0.100 inches.
- the assembly was fired and photographs showed that misalignment of the output from the coupler was less than 0.010 inches. Comparison studies of this arrangement with and without the coupler that outputs could be increased as much as 35 percent with the coupler.
- a precision initiation coupler comprising:
- detonation-confining body having an l-shaped cavity formed therein and extending axially through said body;
- a detonating explosive substantially filling said shaped cavity.
- An explosive device comprising:
- each said explosive charge having an axis ideally centering a detonation wave passing through each said explosive charge when detonated;
- a precision initiation coupler comprising a detonation confining body having an l-shaped cavity axially-formed therein and extending through said body to open through opposing ends of said body, said cavity being substantially filled with a detonating explosive to provide said detonating explosive with an I-shape having a pair of exposed end faces, said precision initiation coupler positioned in axial alignment with said first explosive charge and adjacent said first and said second explosive charges so that detonation of said second explosive charge is transmitted through said precision initiation coupler to detonate said first explosive charge, said axis of said second explosive charge terminating within the area of said one exposed end face of said l-shaped detonating explosive which is adjacent said second explosive charge, whereby detonation of said second explosive charge received by said one exposed end face is funnelled through said l-shaped detonating explosive to exit at said other exposed end face in substantial axial alignment with said first explosive charge.
- said detonation-confining body is formed from a metal selected from the group consisting of steel and aluminum.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Portable Nailing Machines And Staplers (AREA)
Abstract
Description
Claims (10)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US9166470A | 1970-12-23 | 1970-12-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3707917A true US3707917A (en) | 1973-01-02 |
Family
ID=22229010
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00091664A Expired - Lifetime US3707917A (en) | 1970-12-23 | 1970-12-23 | Precision initiation coupler |
Country Status (1)
Country | Link |
---|---|
US (1) | US3707917A (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4112845A (en) * | 1976-07-28 | 1978-09-12 | The United States Of America As Represented By The Secretary Of The Navy | Apparatus for detonating across a gap |
US4316412A (en) * | 1979-06-05 | 1982-02-23 | The United States Of America As Represented By The United States Department Of Energy | Low voltage nonprimary explosive detonator |
US6467416B1 (en) * | 2002-01-08 | 2002-10-22 | The United States Of America As Represented By The Secretary Of The Army | Combined high-blast/anti-armor warheads |
US20060125299A1 (en) * | 2003-12-16 | 2006-06-15 | Ergo-Industrial Seating Systems Inc. | Lever arm with tactile contour |
US20100024674A1 (en) * | 2004-12-13 | 2010-02-04 | Roland Peeters | Reliable propagation of ignition in perforation systems |
US8371224B1 (en) | 2008-11-26 | 2013-02-12 | The United States Of America As Represented By The Secretary Of The Navy | Variable yield device and method of use |
WO2015119536A1 (en) * | 2014-02-06 | 2015-08-13 | Глеб Владимирович ЛОКШИН | Universal means of initiation and device based on same |
WO2016076918A1 (en) * | 2014-11-11 | 2016-05-19 | Raytheon Company | Fuze shock transfer system |
US9714817B1 (en) | 2015-03-06 | 2017-07-25 | The United States Of America As Represented By The Secretary Of The Navy | Central initiating charge |
RU194598U1 (en) * | 2019-04-23 | 2019-12-17 | Глеб Владимирович Локшин | Ignition initiator |
RU194597U1 (en) * | 2019-04-23 | 2019-12-17 | Глеб Владимирович Локшин | Ignition initiator |
RU195590U1 (en) * | 2019-04-23 | 2020-01-31 | Глеб Владимирович Локшин | Ignition initiator |
RU195591U1 (en) * | 2019-04-23 | 2020-01-31 | Глеб Владимирович Локшин | Ignition initiator |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2707438A (en) * | 1954-05-26 | 1955-05-03 | Canadian Ind 1954 Ltd | Short interval delay blasting device |
US2736263A (en) * | 1956-02-28 | Blasting explosive device | ||
US2796834A (en) * | 1956-03-09 | 1957-06-25 | Canadian Ind | Short interval delay blasting device |
-
1970
- 1970-12-23 US US00091664A patent/US3707917A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2736263A (en) * | 1956-02-28 | Blasting explosive device | ||
US2707438A (en) * | 1954-05-26 | 1955-05-03 | Canadian Ind 1954 Ltd | Short interval delay blasting device |
US2796834A (en) * | 1956-03-09 | 1957-06-25 | Canadian Ind | Short interval delay blasting device |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4112845A (en) * | 1976-07-28 | 1978-09-12 | The United States Of America As Represented By The Secretary Of The Navy | Apparatus for detonating across a gap |
US4316412A (en) * | 1979-06-05 | 1982-02-23 | The United States Of America As Represented By The United States Department Of Energy | Low voltage nonprimary explosive detonator |
US6467416B1 (en) * | 2002-01-08 | 2002-10-22 | The United States Of America As Represented By The Secretary Of The Army | Combined high-blast/anti-armor warheads |
US20060125299A1 (en) * | 2003-12-16 | 2006-06-15 | Ergo-Industrial Seating Systems Inc. | Lever arm with tactile contour |
US20100024674A1 (en) * | 2004-12-13 | 2010-02-04 | Roland Peeters | Reliable propagation of ignition in perforation systems |
US8267012B2 (en) * | 2004-12-13 | 2012-09-18 | Dynaenergetics Gmbh & Co. Kg | Reliable propagation of ignition in perforation systems |
US8371224B1 (en) | 2008-11-26 | 2013-02-12 | The United States Of America As Represented By The Secretary Of The Navy | Variable yield device and method of use |
CN106471329A (en) * | 2014-02-06 | 2017-03-01 | 格列布·弗拉基米罗维奇·洛克新 | General priming device and the device based on this device |
WO2015119536A1 (en) * | 2014-02-06 | 2015-08-13 | Глеб Владимирович ЛОКШИН | Universal means of initiation and device based on same |
RU2688174C2 (en) * | 2014-02-06 | 2019-05-20 | Глеб Владимирович Локшин | Universal initiation means and device based on it |
WO2016076918A1 (en) * | 2014-11-11 | 2016-05-19 | Raytheon Company | Fuze shock transfer system |
US9347754B1 (en) | 2014-11-11 | 2016-05-24 | Raytheon Company | Fuze shock transfer system |
US9714817B1 (en) | 2015-03-06 | 2017-07-25 | The United States Of America As Represented By The Secretary Of The Navy | Central initiating charge |
US10060717B1 (en) | 2015-03-06 | 2018-08-28 | The United States Of America As Represented By The Secretary Of The Navy | Central initiating charge |
RU194598U1 (en) * | 2019-04-23 | 2019-12-17 | Глеб Владимирович Локшин | Ignition initiator |
RU194597U1 (en) * | 2019-04-23 | 2019-12-17 | Глеб Владимирович Локшин | Ignition initiator |
RU195590U1 (en) * | 2019-04-23 | 2020-01-31 | Глеб Владимирович Локшин | Ignition initiator |
RU195591U1 (en) * | 2019-04-23 | 2020-01-31 | Глеб Владимирович Локшин | Ignition initiator |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3707917A (en) | Precision initiation coupler | |
FI57741C (en) | ANORDINATION FOER INITIERING AV SPRAENGLADDNINGAR | |
US3978796A (en) | Focused blast-fragment warhead | |
US3736875A (en) | Explosive charge with annular ignition gap | |
JPS62500024A (en) | Non-primary explosive detonator | |
US3224368A (en) | Dual liner shaped charge | |
GB1533685A (en) | Delay detonator device | |
US3451339A (en) | Priming explosive devices | |
US4579059A (en) | Tubular projectile having an explosive material therein | |
US3688702A (en) | Detonator device for explosive charge exhibiting detonating effect capable of bridging gap between spaced charges | |
US3021786A (en) | Blasting device | |
US6513437B2 (en) | Blast initiation device | |
EP0172647B1 (en) | A shock-augmenting charge | |
US4282814A (en) | Dual-end warhead initiation system | |
US3169480A (en) | Safety device for detonator cord | |
US5959236A (en) | Through bulkhead initiator | |
US3906857A (en) | Anti-tank mine | |
US20020011173A1 (en) | Pyrotechnic impact fuse | |
US3742856A (en) | Advanced continuous warhead | |
US5233929A (en) | Booster explosive rings | |
US3159103A (en) | Detonator to igniter adapter for initiating propellant mixes | |
US3744421A (en) | Explosive safe and arming system | |
US6279480B1 (en) | Firing pin assembly for a warhead detonator | |
US1172636A (en) | Projectile. | |
US3894489A (en) | Explosive assemblies and method of utilizing the same |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: WHITTAKER CORPORATION, A CORP. OF DE. Free format text: MERGER;ASSIGNOR:WHITTAKER CORPORATION, A CORP. OF CA.;REEL/FRAME:005261/0367 Effective date: 19861001 Owner name: WHITTAKER CORPORATION, A CORP. OF CA., CALIFORNIA Free format text: MERGER;ASSIGNOR:TASKER INDUSTRIES, A CORP. OF CA.;REEL/FRAME:005267/0361 Effective date: 19721028 |
|
AS | Assignment |
Owner name: SECURITY PACIFIC NATIONAL BANK Free format text: SECURITY INTEREST;ASSIGNOR:WHITTAKER CORPORATION;REEL/FRAME:005311/0926 Effective date: 19890628 |
|
AS | Assignment |
Owner name: WHITTAKER CORPORATION, A CORP. OF DE, DELAWARE Free format text: MERGER;ASSIGNOR:WHITTAKER CORPORATION, A CORP. OF CA;REEL/FRAME:005268/0473 Effective date: 19861031 |
|
AS | Assignment |
Owner name: WHITTAKER CORPORATION, CALIFORNIA Free format text: RELEASE OF LIEN;ASSIGNOR:SECURITY PACIFIC NATIONAL BANK;REEL/FRAME:007815/0366 Effective date: 19900605 |