US3891162A - Delay detonator with by-pass explosive bolt system - Google Patents

Delay detonator with by-pass explosive bolt system Download PDF

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US3891162A
US3891162A US430958A US43095874A US3891162A US 3891162 A US3891162 A US 3891162A US 430958 A US430958 A US 430958A US 43095874 A US43095874 A US 43095874A US 3891162 A US3891162 A US 3891162A
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explosive
charge
projectile
igniting
dispensable
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William G Wolterman
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US Department of Army
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    • 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
    • F42B3/006—Explosive bolts; Explosive actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C15/00—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges
    • F42C15/18—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein a carrier for an element of the pyrotechnic or explosive train is moved
    • F42C15/184—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein a carrier for an element of the pyrotechnic or explosive train is moved using a slidable carrier
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C15/00—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges
    • F42C15/28—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges operated by flow of fluent material, e.g. shot, fluids
    • F42C15/29—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges operated by flow of fluent material, e.g. shot, fluids operated by fluidic oscillators; operated by dynamic fluid pressure, e.g. ram-air operated

Definitions

  • ABSTRACT A projectile having a main explosive charge and a sin- [22] Ffled' 1974 gle igniting means is provided with: a first firing train,
  • a dual detonator assembly similar to that to be described herein, and including a single igniting means, two detonators and a delay charge, is used to first explode one detonator to explosively separate a stabilizing tail component from the detonator assembly and subsequently initiate the other detonator.
  • Explosive projectiles adapted to be launched toward an enemy target are usually provided with suitable mechanisms or means for safing, delaying, arming and detonating the main explosive charge before or during flight, or at impact with the target or other object.
  • These mechanisms sometimes include a part or element that performs its function, e.g., aerodynamically, during the early stages of flight, and subsequently interferes with the further flight or other operation of the projectile, and thus becomes dispensable.
  • An object of the present invention is to provide an explosive projectile having a main explosive charge a dispensable element and means for explosively separating the dispensable element from the projectile after it has performed its intended function and then exploding the main charge.
  • the projectile includes a hollow annular housing coning a main explosive charge and including an inner wall through which at least one explosive lead extends, a dispensable element, a single igniting means, a first firing train comprising within the inner wall and a delay means and a first explosive means connecting the igniting means and the explosive lead, and a second firing train including a flash tube connecting the igniting means with a second explosive charge disposed adjacent to the dispensable element.
  • the dispensable element may, for example, be an aerodynamic element forming a part of an arming means for completing the first firing train prior to initiation of the igniting means.
  • FIG. 1 is an axial sectional view, taken on line II of FIG. 2, of an explosive projectile incorporating the present invention, with the arming means in the safe position and the dispensable element in stowed position.
  • FIG. 2 is a top plan view of FIG. I.
  • FIG. 3 is a view similar to FIG. 1, showing the arming means in the armed position and the dispensable element in axially extended position, prior to separation from the projectile.
  • FIG. 4 is a fragmentary axial section view showing a portion of the structure of FIG. 3 after separation of the dispensable element.
  • FIGS. 1 and 2 illustrate the invention incorporated in an explosive projectile 1 comprising a re-entrant or annular metal housing 3 including an outer tubular wall 5 and an inner tubular wall 7, and a circular rear end plate 9.
  • the annular space between the walls 5 and 7 is filled with a high explosive main charge 11, e.g., of RDX (cyclonite).
  • the projectile fuze comprises one or more radial apertures 13 through the inner wall 7, intermediate the ends thereof, each filled with a high explosive booster lead 15, e.g., of RDX or PETN (pentaerythritol tetranitrate), and operatively connecting the interior of wall 7 with the charge 11.
  • the end plate 9 has a central aperture 17 which surrounds the rear end 19 of wall 7.
  • the end plate 9 is clamped to the rear end 21 of outer wall 5 by means of a metal clamp member 23, which comprises an externally-threaded metal hub 25, threaded into an intemally-threaded recess 27 in wall 7, and a peripheral flange 29, which is seated in an annuiar recess 31 in plate 9.
  • Spanner wrench holes 33 are provided in flange 29 for turning the clamp memher.
  • a detonator tube-flash tube assembly 35 comprising a metal detonator tube 37 and a metal flash tube 39, is axially and slidably mounted within the inner wall 7.
  • Detonator tube 37 comprises a thick-walled rear tubular portion 41, having an axial bore 43 in which the flash tube 39 is fixed, and a thin-walled forward portion 45 integral with the rear portion 41 and spaced radially from flash tube 39 to form an annular powder chamber 47 therebetween.
  • a combustible delay element 49 Disposed within the chamber 47 are, from front to rear, a combustible delay element 49, e.g., an elongated pellet of black powder or a barium chromate-boron composition composed of about 89% barium chromate, [0% boron and 1% vinyl alcohol acetate resin, an intermediate primary high explosive charge 51, e.g., of lead azide, and a secondary high explosive charge 53, e.g., of RDX or PETN.
  • the rear detonator tube portion 41 comprises an external threaded part 55 which engages internal threads 56 on the clamp member 23, for movably mounting the detonator tube in the projectile.
  • the detonator tube 37 is initially positioned as shown in FIG. I with the charge 53in the safe position displaced axially (out-of-line) from the leads [5.
  • the detonator tube 37 is unscrewed rearwardly from the clamp member 23 during the flight of the projectile by reaction of the air stream with an aerodynamic element in the form of a spiral spring 57, e.g., of steel, having a flat inner end 59 mounted, with a reinforcing plate 61, in a transverse slot 63 in an extension 65 of the detonator tube.
  • the end of the extension 65 is peened over at 66 to close the detonator tube 37 and hold the end 59 in the slot 63.
  • the spiral spring 57 Prior to launch, the spiral spring 57 is retained, in the flat position shown in FIG. 1, in a circular recess 67 in end plate 9, by engagement with a portion of the projectile launcher, or the adjacent end of a similar projectile stacked therewith.
  • the restraint is removed, and the spring 57, which is pre-formed to a conical spiral shape, springs out of the recess 67 into the conical shape shown in FIG. 2.
  • the air stream causes the spring to rotate relative to the projectile, unscrewing the threaded end 55 from the threads 57 and moving the detonator tube 37 rearwardly to the free-spinning, armed position, shown in FIG.
  • the arming means of the fuze comprises the lead 15, the axially-movable detonator tube 37, the threads 56 and the rotatable spring 57.
  • the structure described thus far may be launched either as a single projectile from a gun barrel or other launch tube or as one of a plurality of sub-projectiles from a multiple-warhead projectile.
  • the igniting means 71 may be initiated at impact with a target by any conventional means.
  • the projectile or sub-projectile may be of the rebounding" type comprising a forward impacting part, a rear explosive part and a propelling charge interposed between the two parts adapted to be ignited at impact with the ground, for example, to propel the explosive part backwardly, for explosion at a desired height after a predetermined time delay produced by the delay element 49.
  • the flash tube 39 is added, extending co-axially from the forward end of detonator tube 37 to the rear end of threaded portion 55; and explosive charges, including an intermediate primary high explosive charge 75, e.g., of lead azide, and an explosive-bolt-type charge 77, e.g. of RDX or PETN, are positioned within the flash tube 39 adjacent to the threaded portion 55, for explosively separating the spring 57 from the projectile immediately after impact.
  • explosive charges including an intermediate primary high explosive charge 75, e.g., of lead azide, and an explosive-bolt-type charge 77, e.g. of RDX or PETN
  • the flash therefrom substantially simultaneously initiates the delay element 49 and the intermediate charge 75, which immediately detonates the explosive-bolt charge 77.
  • the explosion of charge 77 ruptures the flash tube 39 and threaded portion 55 as shown schematically at 79 in FIG. 4, thus effectively separating the spring 57 from the projectile.
  • the propelling charge thereof may be the igniting means 71.
  • the igniting means 7] may be a conventional percussion primer with conventional firing means. Tests have shown that the explosive-bolt function occurs about 0.0003 second after ignition of igniting means 71.
  • the delay element 49 continues to burn, eventually igniting the intermediate charge 51, which in turn detonates the secondary charge 53, to inltiste the leads I! and main chsrge ii. in tests of three examples with different delay elements of barium chromsteboron delay composition, the overall functioning times of the firing train including the igniting means 71 and the charges 49, Si, 53 snd 15, were 0.0l7, 0.106 and 0.230 second, respectively.
  • an explosive projectile comprising a hollow annular housing containing a main explosive charge and including an inner wall through which at least one explosive lead extends, a single igniting means and a dispensable element adapted to be separated from the projectile after it has performed its function but before the main explosive charge is exploded, a fuze comprismg:
  • a second firing train comprising second explosive means disposed adjacent to said dispensable element for separating said element from said projectile, and means connecting said igniting means with said second explosive means for initiating the latter immediately after ignition of said igniting means.
  • a fuze as in claim 1 further including a hollow member within said inner wall containing said delay means and said first explosive means at one end thereof; said connecting means comprising a flash tube extending coaxially through said hollow member and containing said second explosive means near the other end of said member; and said dispensable element being removably attached to said other end of said member.
  • a fume including:
  • A. a first firing train for exploding said main charge comprising a combustible delay element exposed to said igniting means, first explosive means exposed to said delay element but initially disconnected from said msin charge, and an means for operably connecting said first explosive means with said main chsrge during the flight of said projectile, said arming means including s dispensable part;
  • a second firing train comprising second explosive means disposed adjacent to said dispensable part of said arming means, and means connecting said lgniting means with said second explosive means; whereby said igniting means, when ignited at s predetermined time sfter operation of said arming means, simultaneously ignites ssld delay element, for exploding said msin charge after s predetermined time delsy, and initiates said second explosive means, to separate said dispensable part of said srrning means from said projectile.
  • a fuze as in cldm 3, wherein said dispensable part of ssid arming means is sn aerodynamic element ex posed to the sir stream during the flight of said projsc tile for actuating ssid arming means to am said first fir ing trsin prior to the ignition of ssid igniting means.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

A projectile having a main explosive charge and a single igniting means is provided with: a first firing train, comprising a delay composition, a series of intermediate explosive charges initially disconnected from the main charge, and an arming means, including a dispensable aerodynamic element, operatively connecting the igniting means with the main charge during the flight of the projectile; and a second firing train comprising a flash tube connecting the igniting means with an auxiliary charge or detonator disposed adjacent to the dispensable element, for explosively separating the dispensable element from the projectile after the element has performed its function and prior to explosion of the main charge.

Description

United States Patent Wolterman 1 1 June 24, 1975 [54] DELAY DETONATOR WlTl-I BY-PASS 3,792,662 2/1974 Wolterman 102/70 EXPLOSIVE BOLT SYSTEM Primary Examiner-Verlin R. Pendegrass [75] Inventor. g gz g Huntington Attorney, Agent, or Firm-Nathan Edelberg; Robert P.
' Gibson; Thomas R. Webb [73] Assignee: The United States of America as represented by the Secretary of the Army, Washington, DC. {57] ABSTRACT A projectile having a main explosive charge and a sin- [22] Ffled' 1974 gle igniting means is provided with: a first firing train,
[21] Appl. No.: 430,958
[52] US. Cl. 244/125; 102/4; 102/812 [51] Int. Cl. F4213 25/10 [58] Field of Search 102/2, 4, 712, 81.2, 244/325, 3.3
[56] References Cited UNITED STATES PATENTS 2,597,703 5/1952 Busacker 4 244/325 2,750,888 6/1956 Wynn 102/812 3,710,715 l/1973 Hoofnagle 102/4 comprising a delay composition, a series of intermediate explosive charges initially disconnected from the main charge, and an anning means, including a dispensable aerodynamic element, operatively connecting the igniting means with the main charge during the flight of the projectile; and a second firing train comprising a flash tube connecting the igniting means with an auxiliary charge or detonator disposed adjacent to the dispensable element, for explosively separating the dispensable element from the projectile after the element has performed its function and prior to explosion of the main charge.
9 Claims, 4 Drawing Figures PATENTEDJUN 24 ms SHEET DELAY DETONATOR WITH BY-PASS EXPLOSIVE BOLT SYSTEM The present invention is an improvement over the invention disclosed and claimed in my copending US. Pat. application, entitled Delay Detonator With By- Pass Explosive Bolt System," Ser. No. 278,l28, filed Aug. 4, i972, and now US. Pat. No. 3,792,662, of which the present application is a continuation-in-part. In that application, a dual detonator assembly similar to that to be described herein, and including a single igniting means, two detonators and a delay charge, is used to first explode one detonator to explosively separate a stabilizing tail component from the detonator assembly and subsequently initiate the other detonator.
BACKGROUND AND SUMMARY OF THE INVENTION Explosive projectiles adapted to be launched toward an enemy target are usually provided with suitable mechanisms or means for safing, delaying, arming and detonating the main explosive charge before or during flight, or at impact with the target or other object. These mechanisms sometimes include a part or element that performs its function, e.g., aerodynamically, during the early stages of flight, and subsequently interferes with the further flight or other operation of the projectile, and thus becomes dispensable.
An object of the present invention is to provide an explosive projectile having a main explosive charge a dispensable element and means for explosively separating the dispensable element from the projectile after it has performed its intended function and then exploding the main charge.
In accordance with one feature of the the invention, the projectile includes a hollow annular housing coning a main explosive charge and including an inner wall through which at least one explosive lead extends, a dispensable element, a single igniting means, a first firing train comprising within the inner wall and a delay means and a first explosive means connecting the igniting means and the explosive lead, and a second firing train including a flash tube connecting the igniting means with a second explosive charge disposed adjacent to the dispensable element. The dispensable element may, for example, be an aerodynamic element forming a part of an arming means for completing the first firing train prior to initiation of the igniting means.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an axial sectional view, taken on line II of FIG. 2, of an explosive projectile incorporating the present invention, with the arming means in the safe position and the dispensable element in stowed position.
FIG. 2 is a top plan view of FIG. I.
FIG. 3 is a view similar to FIG. 1, showing the arming means in the armed position and the dispensable element in axially extended position, prior to separation from the projectile.
FIG. 4 is a fragmentary axial section view showing a portion of the structure of FIG. 3 after separation of the dispensable element.
DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT FIGS. 1 and 2 illustrate the invention incorporated in an explosive projectile 1 comprising a re-entrant or annular metal housing 3 including an outer tubular wall 5 and an inner tubular wall 7, and a circular rear end plate 9. The annular space between the walls 5 and 7 is filled with a high explosive main charge 11, e.g., of RDX (cyclonite). The projectile fuze comprises one or more radial apertures 13 through the inner wall 7, intermediate the ends thereof, each filled with a high explosive booster lead 15, e.g., of RDX or PETN (pentaerythritol tetranitrate), and operatively connecting the interior of wall 7 with the charge 11. The end plate 9 has a central aperture 17 which surrounds the rear end 19 of wall 7. The end plate 9 is clamped to the rear end 21 of outer wall 5 by means of a metal clamp member 23, which comprises an externally-threaded metal hub 25, threaded into an intemally-threaded recess 27 in wall 7, and a peripheral flange 29, which is seated in an annuiar recess 31 in plate 9. Spanner wrench holes 33 are provided in flange 29 for turning the clamp memher.
A detonator tube-flash tube assembly 35, comprising a metal detonator tube 37 and a metal flash tube 39, is axially and slidably mounted within the inner wall 7. Detonator tube 37 comprises a thick-walled rear tubular portion 41, having an axial bore 43 in which the flash tube 39 is fixed, and a thin-walled forward portion 45 integral with the rear portion 41 and spaced radially from flash tube 39 to form an annular powder chamber 47 therebetween. Disposed within the chamber 47 are, from front to rear, a combustible delay element 49, e.g., an elongated pellet of black powder or a barium chromate-boron composition composed of about 89% barium chromate, [0% boron and 1% vinyl alcohol acetate resin, an intermediate primary high explosive charge 51, e.g., of lead azide, and a secondary high explosive charge 53, e.g., of RDX or PETN. The rear detonator tube portion 41 comprises an external threaded part 55 which engages internal threads 56 on the clamp member 23, for movably mounting the detonator tube in the projectile. The detonator tube 37 is initially positioned as shown in FIG. I with the charge 53in the safe position displaced axially (out-of-line) from the leads [5.
The detonator tube 37 is unscrewed rearwardly from the clamp member 23 during the flight of the projectile by reaction of the air stream with an aerodynamic element in the form of a spiral spring 57, e.g., of steel, having a flat inner end 59 mounted, with a reinforcing plate 61, in a transverse slot 63 in an extension 65 of the detonator tube. The end of the extension 65 is peened over at 66 to close the detonator tube 37 and hold the end 59 in the slot 63.
Prior to launch, the spiral spring 57 is retained, in the flat position shown in FIG. 1, in a circular recess 67 in end plate 9, by engagement with a portion of the projectile launcher, or the adjacent end of a similar projectile stacked therewith. During launch, the restraint is removed, and the spring 57, which is pre-formed to a conical spiral shape, springs out of the recess 67 into the conical shape shown in FIG. 2. Then, due to the difference in air drag on the projectile and spring, the air stream causes the spring to rotate relative to the projectile, unscrewing the threaded end 55 from the threads 57 and moving the detonator tube 37 rearwardly to the free-spinning, armed position, shown in FIG. 2, wherein a reduced diameter portion 69 of detonator tube 37 clears the threads 57 and the charge 53 is located adjacent to and in line with the leads 15. A single igniting means 71 is mounted within the inner wall 7, as by means of a metal plug 73, in front of and exposed to the forward ends of the delay element 49 (and the flash tube 39), for initiating the burning of the delay element. Another function of the spring 57 is to stabilize the flight of the projectile after extension of the spring to its conical shape. Thus, the arming means of the fuze comprises the lead 15, the axially-movable detonator tube 37, the threads 56 and the rotatable spring 57.
The structure described thus far (without the flash tube 39) may be launched either as a single projectile from a gun barrel or other launch tube or as one of a plurality of sub-projectiles from a multiple-warhead projectile. in either case, the igniting means 71 may be initiated at impact with a target by any conventional means. The projectile or sub-projectile may be of the rebounding" type comprising a forward impacting part, a rear explosive part and a propelling charge interposed between the two parts adapted to be ignited at impact with the ground, for example, to propel the explosive part backwardly, for explosion at a desired height after a predetermined time delay produced by the delay element 49. it has been found that, when the rear part of the projectile 1 with its extended arming spring 57 rebounds as described, the nowforwardlyextending spring 57, which has performed its intended function of arming the fuze, interferes with the stability of the rebounding part. Therefore, in accordance with the present invention: the flash tube 39 is added, extending co-axially from the forward end of detonator tube 37 to the rear end of threaded portion 55; and explosive charges, including an intermediate primary high explosive charge 75, e.g., of lead azide, and an explosive-bolt-type charge 77, e.g. of RDX or PETN, are positioned within the flash tube 39 adjacent to the threaded portion 55, for explosively separating the spring 57 from the projectile immediately after impact. Upon impact and the initiation of the igniting means 71, the flash therefrom substantially simultaneously initiates the delay element 49 and the intermediate charge 75, which immediately detonates the explosive-bolt charge 77. The explosion of charge 77 ruptures the flash tube 39 and threaded portion 55 as shown schematically at 79 in FIG. 4, thus effectively separating the spring 57 from the projectile. Where the projectile is of the rebounding" type, the propelling charge thereof may be the igniting means 71. in other projectiles, the igniting means 7] may be a conventional percussion primer with conventional firing means. Tests have shown that the explosive-bolt function occurs about 0.0003 second after ignition of igniting means 71. Meanwhile, the delay element 49 continues to burn, eventually igniting the intermediate charge 51, which in turn detonates the secondary charge 53, to inltiste the leads I! and main chsrge ii. in tests of three examples with different delay elements of barium chromsteboron delay composition, the overall functioning times of the firing train including the igniting means 71 and the charges 49, Si, 53 snd 15, were 0.0l7, 0.106 and 0.230 second, respectively.
The foregoing disclosure and drawings are merely lllustrstive of the principles of this invention and are not to be interpreted in s limiting sense. i wish it to be un= derstood that I do not desire to be limited to exact details of construction shown and described for obvious modifications will occur to a person skilled in the art.
Having thus fully described the invention, what is claimed as new and desired to be secured by Letters Patent of the United States is:
l. in an explosive projectile comprising a hollow annular housing containing a main explosive charge and including an inner wall through which at least one explosive lead extends, a single igniting means and a dispensable element adapted to be separated from the projectile after it has performed its function but before the main explosive charge is exploded, a fuze comprismg:
A. a first firing train mounted within said inner wall and comprising combustible delay means and first explosive means interposed between and connecting said igniting means with said explosive lead, for initiating said main explosive charge at a predetermined time after ignition of said igniting means; and
B. a second firing train comprising second explosive means disposed adjacent to said dispensable element for separating said element from said projectile, and means connecting said igniting means with said second explosive means for initiating the latter immediately after ignition of said igniting means.
2. A fuze as in claim 1, further including a hollow member within said inner wall containing said delay means and said first explosive means at one end thereof; said connecting means comprising a flash tube extending coaxially through said hollow member and containing said second explosive means near the other end of said member; and said dispensable element being removably attached to said other end of said member.
3. In an explosive projectile comprising a housing containing a main explosive charge and a single igniting means spaced from said main charge, a fume including:
A. a first firing train for exploding said main charge comprising a combustible delay element exposed to said igniting means, first explosive means exposed to said delay element but initially disconnected from said msin charge, and an means for operably connecting said first explosive means with said main chsrge during the flight of said projectile, said arming means including s dispensable part; and
B. a second firing train comprising second explosive means disposed adjacent to said dispensable part of said arming means, and means connecting said lgniting means with said second explosive means; whereby said igniting means, when ignited at s predetermined time sfter operation of said arming means, simultaneously ignites ssld delay element, for exploding said msin charge after s predetermined time delsy, and initiates said second explosive means, to separate said dispensable part of said srrning means from said projectile.
4. A fuze as in cldm 3, wherein said dispensable part of ssid arming means is sn aerodynamic element ex posed to the sir stream during the flight of said projsc= tile for actuating ssid arming means to am said first fir ing trsin prior to the ignition of ssid igniting means.
5. A fuss as in claim 3, further including a hollow member containing said delay element and said first sx= plosivs means at one end thereof, and a flash tubs dis= posed cosxiaily within said hollow member and com raining said second explosive means near the othsr and of said member.
6. A fuze as in claim 5, wherein said housing is annular; and said arming means comprises an explosive lead extending through the inner wall of said housing, and means connecting said hollow member to said housing for movement of said member between unarmed and armed positions wherein said first explosive means is misaligned and aligned, respectively, with said explosive lead.
7. A fuze as in claim 6, wherein said hollow member is threadedly connected to said housing for axial movement between said two positions, and said dispensable part of said arming means is an aerodynamic element attached to said other end of said hollow member and adapted to be rotated by the air stream during the flight of the projectile to move said member axially from the intermediate charge.
# i i i I.

Claims (9)

1. In an explosive projectile comprising a hollow annular housing containing a main explosive charge and including an inner wall through which at least one explosive lead extends, a single igniting means and a dispensable element adapted tO be separated from the projectile after it has performed its function but before the main explosive charge is exploded, a fuze comprising: A. a first firing train mounted within said inner wall and comprising combustible delay means and first explosive means interposed between and connecting said igniting means with said explosive lead, for initiating said main explosive charge at a predetermined time after ignition of said igniting means; and B. a second firing train comprising second explosive means disposed adjacent to said dispensable element for separating said element from said projectile, and means connecting said igniting means with said second explosive means for initiating the latter immediately after ignition of said igniting means.
2. A fuze as in claim 1, further including a hollow member within said inner wall containing said delay means and said first explosive means at one end thereof; said connecting means comprising a flash tube extending coaxially through said hollow member and containing said second explosive means near the other end of said member; and said dispensable element being removably attached to said other end of said member.
3. In an explosive projectile comprising a housing containing a main explosive charge and a single igniting means spaced from said main charge, a fuze including: A. a first firing train for exploding said main charge comprising a combustible delay element exposed to said igniting means, first explosive means exposed to said delay element but initially disconnected from said main charge, and an arming means for operably connecting said first explosive means with said main charge during the flight of said projectile, said arming means including a dispensable part; and B. a second firing train comprising second explosive means disposed adjacent to said dispensable part of said arming means, and means connecting said igniting means with said second explosive means; whereby said igniting means, when ignited at a predetermined time after operation of said arming means, simultaneously ignites said delay element, for exploding said main charge after a predetermined time delay, and initiates said second explosive means, to separate said dispensable part of said arming means from said projectile.
4. A fuze as in claim 3, wherein said dispensable part of said arming means is an aerodynamic element exposed to the air stream during the flight of said projectile for actuating said arming means to arm said first firing train prior to the ignition of said igniting means.
5. A fuze as in claim 3, further including a hollow member containing said delay element and said first explosive means at one end thereof, and a flash tube disposed coaxially within said hollow member and containing said second explosive means near the other end of said member.
6. A fuze as in claim 5, wherein said housing is annular; and said arming means comprises an explosive lead extending through the inner wall of said housing, and means connecting said hollow member to said housing for movement of said member between unarmed and armed positions wherein said first explosive means is misaligned and aligned, respectively, with said explosive lead.
7. A fuze as in claim 6, wherein said hollow member is threadedly connected to said housing for axial movement between said two positions, and said dispensable part of said arming means is an aerodynamic element attached to said other end of said hollow member and adapted to be rotated by the air stream during the flight of the projectile to move said member axially from the unarmed position to the armed position.
8. A fuze as in claim 7, wherein said element is a spiral spring having its inner end rigidly attached to said hollow member.
9. A fuze as in claim 3, wherein: said first explosive means comprises an intermediate primary high explosive element adjacent to said delay charge, and a secondary high explosive charge adjacent to said intermediate charge; and saiD second explosive means comprises a second intermediate primary high explosive charge exposed to said igniting means through said flash tube, and an explosive-bolt charge adjacent to said second intermediate charge.
US430958A 1972-08-04 1974-01-04 Delay detonator with by-pass explosive bolt system Expired - Lifetime US3891162A (en)

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US27812872A 1972-08-04 1972-08-04
US430958A US3891162A (en) 1972-08-04 1974-01-04 Delay detonator with by-pass explosive bolt system

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4335656A (en) * 1980-07-31 1982-06-22 The United States Of America As Represented By The Secretary Of The Navy Underwater launched parachute flare
US6540176B2 (en) * 2001-01-08 2003-04-01 The United States Of America As Represented By The Secretary Of The Army Fin disengagement device for limiting projectile range
US20110204177A1 (en) * 2010-02-25 2011-08-25 Pacific Scientific Energetic Materials Company Projectile diverter release and method of diverting a projectile
US20150226525A1 (en) * 2014-02-13 2015-08-13 Raytheon Company Aerial vehicle with combustible time-delay fuse

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2449540A (en) * 1942-06-09 1948-09-21 Albin Joseph Aircraft flare
US2597703A (en) * 1946-02-07 1952-05-20 Us Navy Rocket fin
US2750888A (en) * 1946-11-13 1956-06-19 Robert O Wynn Long delay bomb tail fuze
US3710715A (en) * 1970-11-24 1973-01-16 Us Army Volute spring stabilizer
US3792662A (en) * 1972-08-04 1974-02-19 Us Army Delay detonator with by-pass explosive bolt system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2449540A (en) * 1942-06-09 1948-09-21 Albin Joseph Aircraft flare
US2597703A (en) * 1946-02-07 1952-05-20 Us Navy Rocket fin
US2750888A (en) * 1946-11-13 1956-06-19 Robert O Wynn Long delay bomb tail fuze
US3710715A (en) * 1970-11-24 1973-01-16 Us Army Volute spring stabilizer
US3792662A (en) * 1972-08-04 1974-02-19 Us Army Delay detonator with by-pass explosive bolt system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4335656A (en) * 1980-07-31 1982-06-22 The United States Of America As Represented By The Secretary Of The Navy Underwater launched parachute flare
US6540176B2 (en) * 2001-01-08 2003-04-01 The United States Of America As Represented By The Secretary Of The Army Fin disengagement device for limiting projectile range
US20110204177A1 (en) * 2010-02-25 2011-08-25 Pacific Scientific Energetic Materials Company Projectile diverter release and method of diverting a projectile
US20150226525A1 (en) * 2014-02-13 2015-08-13 Raytheon Company Aerial vehicle with combustible time-delay fuse
US9121668B1 (en) * 2014-02-13 2015-09-01 Raytheon Company Aerial vehicle with combustible time-delay fuse

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