GB2159931A - Detonator safety device - Google Patents
Detonator safety device Download PDFInfo
- Publication number
- GB2159931A GB2159931A GB08512121A GB8512121A GB2159931A GB 2159931 A GB2159931 A GB 2159931A GB 08512121 A GB08512121 A GB 08512121A GB 8512121 A GB8512121 A GB 8512121A GB 2159931 A GB2159931 A GB 2159931A
- Authority
- GB
- United Kingdom
- Prior art keywords
- slide
- locking
- pin
- safety device
- detonator
- 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.)
- Granted
Links
Classifications
-
- 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
- F42C15/38—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein arming is effected by chemical action
-
- 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
- F42C15/30—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges operated by flow of fluent material, e.g. shot, fluids of propellant gases, i.e. derived from propulsive charge or rocket motor
-
- 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
- F42C15/31—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges operated by flow of fluent material, e.g. shot, fluids generated by the combustion of a pyrotechnic or explosive charge within the fuze
-
- 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
- F42C15/36—Arming-means in fuzes; Safety means for preventing premature detonation of fuzes or charges wherein arming is effected by combustion or fusion of an element; Arming methods using temperature gradients
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Bags (AREA)
- Fuses (AREA)
- Automotive Seat Belt Assembly (AREA)
Abstract
A safety device for detonators used in small rockets includes a piston 3 carrying a stop pin 4 engaging an edge of a detonator slide 1 which contains a detonator chain element 2. The slide 1 is retained by a pin 8 which can be driven by a force element 10. To arm the detonator device, the piston 3 is driven by gas pressure against spring 6 so that pin 5 is sheared and tension is applied to the slide 1 via a draw spring 14. Pin 4 clears pin 8 to allow same to be driven clear of recess 11 by element 10 upon receipt of a detonation signal. This allows the slide 1 to move into the armed position where arm 19 cuts a bridge 18 to arm the detonator. Further safety at elevated temperature is provided by a plate 24 deformable to lock the slide and by a fusion element 23 for venting gas. <IMAGE>
Description
SPECIFICATION
Safety Device for Detonators
This invention relates to a safety device for the
detonators of warheads in small rockets, the
detonators having a spring-loaded slide housing the
detonator which can move from an unarmed into an
armed position, the slide being held in the unarmed
position by means of spring-loaded locking
elements.
Safety devices of this kind are intended to effect
the arming of detonators in accordance with certain
criteria automatically or to hold the detonator in the
unarmed position in the event of failure in the
operation.
In DE 23 5831 OA there is known a safety device
for the detonators of explosive charges, the device
having a slide which can be moved from an
unarmed into an armed position and back again and
which carries a detonator which is subject to the
action of at least one spring for effecting movement.
In one advantageous embodiment the safety device
has a propulsive charge within the propulsion gases
are used to move the slide. This safety device acts as
soon as a criterion is fulfilled, in this case a voltage
surge.
An object of this invention is to provide a safety
device for warheads in small rockets which only arms in the event of two mutually independent
physical criteria occurring in the correct order and
which, if the two criteria occur in the incorrect order,
is completely unarmed after the detonation check.
According to this invention there is provided a
safety device for a detonator used in warheads of
small rockets, the detonator having a spring-loaded
slide with a detonator positioned therein, the slide
being movable from an unarmed position into an
armed position, and the slide being retained in the
unarmed position by means of spring-loaded
locking elements, the device including:: (a) a piston axially movable in opposition to the
force of a spring by gas pressure after shearing of a
shear pin, the piston applying tension to a draw
spring through a locking pin secured radially to the
piston,
(b) a locking slide connected with the draw spring
and housing a detonator, the slide being held in an
unarmed position both by the locking pin of the
piston acting against an edge of the slide and also
by a headed pin sitting partly in a transverse bore of
the slide with a free end engaging a recess in a
guide in which the locking slide moves,
(c) the locking slide in an armed position,
operating an electrical contact through an actuating
element and
(d) the locking pin being associated with a force
applying means to move same from the recess into
the transverse bore of the slide.
The safety device may have a short-circuit contact
which can be made inactive and is provided with a
locking device for the armed position and contains
two mutually independent temperature-operated
safety devices.
An embodiment by way of an example is
illustrated in the accompanying drawing and described hereinafter in more detail. In the drawings:
Figure 1 shows a section in simplified form through a safety device, and
Figure 2 shows the device in a general view partly broken-away.
Figure 1 shows an embodiment of a safety device according to this invention for detonators used in the warheads of small rockets. The detonator housing 27, not shown in detail, contains a locking slide 1 lying in a guide 28. The detonator 2, which in
Figure 1 is shown in the unarmed position, rests in a boring in the slide 1. The locking slide 1 is locked by means of two independent locking elements, one locking element is formed by the piston 3, which carries a locking bolt 4 positioned radially with respect to the piston and which, by an edge 7, blocks the slide 1. The piston 3 is secured in a position of rest by shear pin 5.
The second locking element is formed by a.
locking pin 8 which lies approximately in the middle of a transverse boring 29 in the slide 1. The mobility of this pin in the longitudinal direction is delimited at one end by the end face of the locking bolt 4 and at the other end by the piston rod 9 of a pressure force element 10. The shaped free end 8a of the locking pin 8 extends into a recess 11, thus blocking the slide 1.
The movement of the slide 1 takes place as a result of the gas pressure which is extracted, for example, from a propulsion unit and which flows into the expansion chamber 13 through the gas channels 12. As a result of the gas pressure the piston 3 is moved in the direction shown by the arrow and in opposition to the force of spring 6 after the pin 5 has been sheared off. This tensions draw spring 14 which is secured at one end to the locking bolt 4 and at the other end by means of a pin 15 to the slide of the locking slide 1. At the same time the first locking effect of the slide 1 on the edge 7 is removed and the slide 1 is prestressed in the direction of the arrow by means of the draw spring 14. The locking slide 1 is now only held by the pin 8 which is drawn by its shaped free end 8a into a notch 16 serving as a force threshold.The gas pressure in the expansion chamber 13 must be maintained until the second locking operation has been nullified.
If an electronic detonation system (not shown) feeds a detonation signal, in accordance with certain criteria, to the pressure force element 10, the gas pressure occurring in the latter expels the piston rod 9 and thus forces the pin 8 out of the recess 11. This overcomes the second locking operation, and the locking slide 1 moves into the armed position, so that the detonation chain, not shown in the drawing, is closed by the detonator 2. The activation of the detonation chain takes place via electrical detonation devices, not shown in the drawing, and short-circuited for safety reasons by a wire 18 soldered between two contact plates 17, until the final arming operation takes place. The said wire 18 is cut by an insulating pin 15 affixed to the locking slide 1 when the said locking slide 1 moves into the armed positiOn.From this point onwards the safety device is in readiness for detonation. At the same time the locking slide 1 is held in the armed position by a spring-mounted casing 20 which engages edge 21.visual indication of the armed position is provided by the pin 22 moving out beyond the external contour of the housing 27.
If for some reason the arming operation proceeds in an incorrect sequence, that is if the pressure force element 10 is fired before the gas pressure in the channels 12, then the safety device will be permanently blocked, because the locking bolt 4 occupies the initial position and the force element 10, after detonation, cannot force the locking pin 6 out of the recess 11, because the pin is held by the end surface of the said locking bolt 4. The energy of the force element is absorbed without any effect occurring. If gas pressure is fed to the gas channels 12 now the first unarming operation (shear pin 5, piston 3 and locking bolt 4) is nullified and the draw spring 14 is subjected to tension. In this process the locking pin 8 becomes locked by the notch 16 and exerts a continuous blocking effect.
After the fall in gas pressure the draw spring 14 is relieved of tension and the piston 3 forced into the initial position by the pressure spring 6. The safety device is thus completely unarmed and can be removed without risk.
In order to prevent the safety device from being armed when subjected to excess heat, for example if fire breaks out, a temperature-controlled safety system is included. This is provided on the one hand by a locking plate 24, which may comprise a shape retaining alloy or bimetal strip. If temperatures above about 90"C upwards occur the locking plate 24 undergoes deformation and engages the recess 25. As a second temperature-actuated safety system the gas channel 12 contains a fusion device 23 through which the gas pressure can escape.
The particular advantage of the safety device provided by the invention for detonators of warheads of small rockets is that it provides a reliable arming operation in a simple manner, using two mutually independent physical environmental criteria, the construction and moderate weight making the device universally usable.
Claims (6)
1. A safety device for a detonator used in warheads of small rockets, the detonator having a spring-loaded slide with a detonator positioned therein, the slide being movable from an unarmed position into an armed position, and the slide being retained in the unarmed position by means of spring-loaded locking elements, the device including:: (a) a piston axially movable in opposition to the force of a spring by gas pressure after shearing of a shear pin, the piston applying tension to a draw spring through a locking pin secured radially to the piston,
(b) a locking slide connected with the draw spring and housing a detonator, the slide being held in an unarmed position both by the locking pin of the piston acting against an edge of the slide and also by a headed pin sitting partly in a transverse bore of the slide with a free end engaging a recess in a guide in which the locking slide moves,
(c) the locking slide in an armed position, operating an electrical contact through an actuating element and
(d) the locking pin being associated with a force applying means to move same from the recess into the transverse bore of the slide.
2. A safety device in accordance with Claim 1, wherein the electrical contact comprises two spaced plates connected by a shorting wire which can be broken by means of a cutting pin when the slide moves from the unarmed into the armed position.
3. A safety device in accordance with Claims 1 or 2, wherein the locking slide is provided on a side guide surface with a further recess accommodating a spring loaded casing which engages an edge of the locking slide guide when the locking slide is in the armed position.
4. A safety device for detonators in accordance with any one of Claims 1 to 3 wherein the locking slide has a recess on a lateral guide surface which when in an unarmed position is adjacent a locking tongue which engages the recess following deformation under excess temperature to prevent movement of the slide.
5. A safety device for detonators in accordance with any one of Claims 1 to 4, wherein the gas channel to the piston can be vented by a closure element fusible on temperature increase.
6. A safety device as described herein and exemplified in the drawings.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19843421572 DE3421572C2 (en) | 1984-06-09 | 1984-06-09 | Safety device for detonators of small missile warheads |
Publications (3)
Publication Number | Publication Date |
---|---|
GB8512121D0 GB8512121D0 (en) | 1985-06-19 |
GB2159931A true GB2159931A (en) | 1985-12-11 |
GB2159931B GB2159931B (en) | 1988-02-10 |
Family
ID=6238037
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08512121A Expired GB2159931B (en) | 1984-06-09 | 1985-05-14 | Detonator safety device |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE3421572C2 (en) |
FR (1) | FR2565681B1 (en) |
GB (1) | GB2159931B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019034995A1 (en) * | 2017-08-17 | 2019-02-21 | Tobon Trujillo Luis Eduardo | Electromechanical contact fuse for multi-purpose aircraft ammunition |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4302972A1 (en) * | 1993-02-03 | 1994-08-04 | Deutsche Aerospace | Interlocking linkage for gas generator |
DE19542682C2 (en) * | 1995-11-16 | 1998-11-19 | Daimler Benz Aerospace Ag | Safety device for detonators of small rocket warheads |
DE10133832B4 (en) * | 2001-07-12 | 2005-12-15 | TDW Gesellschaft für verteidigungstechnische Wirksysteme mbH | Safety device for igniter |
DE10137494C1 (en) * | 2001-07-31 | 2002-11-21 | Tdw Verteidigungstech Wirksys | Safety device for detonator has safety element preventing accidental movement of carrier for detonator between safety position and primed position interchanged dependent on detonator type |
DE102014017805B3 (en) * | 2014-12-02 | 2015-11-12 | Junghans Microtec Gmbh | Device for securing a fuse |
SE543078C2 (en) | 2018-12-14 | 2020-10-06 | Saab Ab | Delay unit and method for a projectile |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1137814A (en) * | 1955-09-29 | 1957-06-04 | Soc Tech De Rech Ind | Safety device for initiating projectiles |
FR1585860A (en) * | 1966-01-25 | 1970-02-06 | ||
US3724385A (en) * | 1971-09-20 | 1973-04-03 | Us Navy | Fuze having a pneumatic and inertia arming system |
US3994231A (en) * | 1971-12-08 | 1976-11-30 | The United States Of America As Represented By The Secretary Of The Navy | Guided missile warhead fuze |
DE2305677C2 (en) * | 1973-02-06 | 1982-10-14 | Diehl GmbH & Co, 8500 Nürnberg | Safety device for a detonator of a mine fuse |
DE2443486A1 (en) * | 1974-09-11 | 1976-03-25 | Schaberger & Co Gmbh Josef | Electric fuse with electro-chemical battery - is activated by contacting electrolyte with electrodes by rocket combustion gases |
FR2346676A1 (en) * | 1976-03-29 | 1977-10-28 | Luchaire Sa | DELAY INITIATION SYSTEM, WITH SAFETY, FOR MACHINERY, ESPECIALLY FOR SELF-PROPELLED MACHINERY |
GB2023778B (en) * | 1978-05-31 | 1982-04-15 | British Aerospace | Latch devices |
SE442446B (en) * | 1980-09-25 | 1985-12-23 | Bofors Ab | TENDROR CIRCUIT WITH TWO RESTRICTIONS WITH PREDICTED TIMELINE FOR TRANSMISSION |
US4372212A (en) * | 1980-11-24 | 1983-02-08 | The United States Of America As Represented By The Secretary Of The Navy | Composite safe and arming mechanism for guided missile |
-
1984
- 1984-06-09 DE DE19843421572 patent/DE3421572C2/en not_active Expired
-
1985
- 1985-05-14 GB GB08512121A patent/GB2159931B/en not_active Expired
- 1985-06-07 FR FR8508661A patent/FR2565681B1/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019034995A1 (en) * | 2017-08-17 | 2019-02-21 | Tobon Trujillo Luis Eduardo | Electromechanical contact fuse for multi-purpose aircraft ammunition |
US10845175B2 (en) | 2017-08-17 | 2020-11-24 | Luis Eduardo Tobón Trujillo | Electromechanical contact fuse for multipurpose aircraft ammunition |
Also Published As
Publication number | Publication date |
---|---|
FR2565681B1 (en) | 1988-01-08 |
DE3421572A1 (en) | 1985-12-12 |
GB2159931B (en) | 1988-02-10 |
GB8512121D0 (en) | 1985-06-19 |
DE3421572C2 (en) | 1986-10-02 |
FR2565681A1 (en) | 1985-12-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19990514 |