EP2603766A1 - Dispositif de fixation à verrou pyrotechnique - Google Patents
Dispositif de fixation à verrou pyrotechniqueInfo
- Publication number
- EP2603766A1 EP2603766A1 EP11752311.8A EP11752311A EP2603766A1 EP 2603766 A1 EP2603766 A1 EP 2603766A1 EP 11752311 A EP11752311 A EP 11752311A EP 2603766 A1 EP2603766 A1 EP 2603766A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bolt
- branch
- piece
- pyrotechnic
- action
- 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
- 230000000295 complement effect Effects 0.000 claims description 3
- 230000007704 transition Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 6
- 238000000926 separation method Methods 0.000 description 4
- 230000008961 swelling Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 230000000803 paradoxical effect Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B15/00—Self-propelled projectiles or missiles, e.g. rockets; Guided missiles
- F42B15/36—Means for interconnecting rocket-motor and body section; Multi-stage connectors; Disconnecting means
- F42B15/38—Ring-shaped explosive elements for the separation of rocket parts
Definitions
- the present invention relates to a device for fixing two parts relative to each other.
- the device according to the invention is particularly intended for the aeronautical and space domains to allow the connection, then the separation of certain parts of an aircraft or a space launcher.
- a device can ensure the connection between the different parts of the upper structures of a launcher (the cap carrying a satellite) and cause, by means of a command, the separation of said parts.
- a remote control When two parts between which forces are to be passed must be separated irreversibly and in a short time, by means of a remote control, it is frequently resorted to fixing devices with pyrotechnic rupture, in which a cutting of the one of the two pieces along a given cutting line, in order to separate them from one another.
- These devices generally comprise, for this purpose, a pyrotechnic expansion tube of oblong section, in which circulates a detonating cord which, when ignited, generates a shock wave capable of propagating at high speed along the tube with expansion to deform said tube to the point of making its section substantially circular.
- the expansion tube is housed in a groove with a U-shaped section, made in one of the two parts, this groove being provided with at least one zone of reduced thickness.
- the firing of the detonating cord then causes the breaking of at least one of the wings forming the U of the groove, along lines defined by the zones of reduced thickness.
- Such fasteners have a major drawback, insofar as they implement a break in one of the parts, which implies a risk of seeing a fragment released during the breakage damage equipment located near the area. junction.
- a fixing device provided with a connecting piece, attached against a first of said parts, comprising a hook-shaped end and a central portion at least partially deformable under the action of pyrotechnic means.
- the pyrotechnic means comprise a pyrotechnic expansion tube housed in a groove formed, on one side, by the deformable portion of the first part and, on the other, by the connecting piece.
- the hook meanwhile, is rigid and arranged to hold the second part until the pyrotechnic means are not activated.
- the pyrotechnic means are activated, which causes the expansion tube to swell and subsequently the deformation of the deformable portion of the connecting piece.
- the hook is then driven in the direction of the deformation of the deformable portion and thus releases the second piece vis-à-vis the first, without being generated any breakage of one of said parts.
- the connecting piece can not be both strong and fragile, while being easy to position relative to the two elements to be connected. It follows that such a fixing device, equipped with a monolithic connecting piece, can not provide a satisfactory compromise between these different requirements.
- the object of the present invention is to overcome these drawbacks and concerns a device for fastening two parts relative to each other, said device being able to separate said parts without causing any break, while ensuring a satisfactory compromise. between the ease of assembly, the mechanical strength and the fragility of the fastener.
- the device for fixing two parts relative to each other comprising a latch whose bolt is slidably mounted relative to a first of said parts and can take:
- the passage from said locking position to said unlocking position is effected under the action of pyrotechnic means, is remarkable in that it comprises a branch at least partially deformable under the action of said pyrotechnic means, arranged relative to latch so that the passage from said locking position to said unlocking position is effected through the deformation of said branch.
- the invention proposes to dissociate the function of mechanical solidity and transmission of forces between the two parts, and the function of triggering the unlocking. More precisely, in its locking position, the bolt alone ensures the function of mechanical strength and transmission of forces between the two parts, while the unlocking control function is provided by the pyrotechnic means, capable of sliding the bolt into its unlocking position to make the attachment inactive. In this way, insofar as the two main - albeit paradoxical - requirements of the fastening device according to the invention are fulfilled in a disjointed manner, both of these requirements can be satisfactorily met satisfactorily without compromise. not necessary.
- the bolt can, initially, be mounted easily relative to the first part, then, in a second step, be connected to the pyrotechnic means -through a possible additional part - so that ci can control the passage of the bolt in its locking and unlocking positions, which ensures integration and easy positioning of the lock.
- the invention avoids the use of a break of one of the two parts or an additional element, which avoids seeing a fragment released during a breakage damage equipment located near the fixing area between the two parts.
- said branch is deformable by pivoting at a portion substantially facing the lower end of the pyrotechnic means.
- the latter comprises mechanical restoring means in at least substantially loaded position, arranged at the bolt, between the branch and the first part, so that when said branch is deformed under the action of the pyrotechnic means, said bolt slides in the direction of the deformation of said branch.
- the latter comprises a mechanical connection to a ball, fixed to the branch and the end of the bolt farthest from the second part, so that when said branch is deformed under the action pyrotechnic means, said bolt slides in the direction of the deformation of said branch.
- the pyrotechnic means comprise a pyrotechnic expansion tube, in which circulates a detonating cord, said tube being housed in a groove formed between the first part and the branch.
- At least a part of the bolt is slidably mounted inside a cavity formed in the first part, which makes it possible to limit the number of degrees of freedom of the bolt vis-a-vis said first piece, which can move only in a sliding manner, to a degree of freedom, and thus to ensure the mechanical strength of the attachment between the two parts.
- the bolt is arranged, in the locking position, to maintain a bead provided on the second part, bearing against a complementary cavity formed on the first part, which ensures an effective mechanical fastening of the two parts. parts against each other as long as the pyrotechnic means are not activated.
- Figure 1 is a schematic longitudinal section of a fastening device according to a first embodiment of the invention, the bolt is in the locking position.
- Figure 2 is a schematic longitudinal section of the fixing device of Figure 1, during the transition of the bolt between its locking position to its unlocked position.
- FIG. 3 is a diagrammatic longitudinal section of the fixing device of FIG. 1, the bolt of which is in the unlocked position;
- Figure 2 is a schematic longitudinal section of a fastening device according to a second embodiment of the invention, the bolt is in the locking position.
- Figure 5 is a schematic longitudinal section of the fixing device of Figure 4, during the transition of the bolt between its locking position to its unlocked position.
- FIG. 6 is a diagrammatic longitudinal section of the fastening device of FIG. 4, the bolt of which is in the unlocked position.
- the fastening device 1 of FIGS. 1 to 3 is intended to fasten two parts 2 and 3 one of them. compared to each other. It comprises for this purpose a branch 4, pyrotechnic means 5 and a lock 6.
- the first lower part 2 comprises a first portion 2 1 facing the pyrotechnic means 5 and a second portion 2.2 above the first portion 2 1 and in the extension thereof, the latch 6 being mounted at this second portion.
- the second piece 3, upper has a lower portion 3. 1 which has the shape of a heel.
- This heel 3. 1 is adapted to cooperate with the lock 6, at its upper surface 3.2.
- the parts 2 and 3 are intended to rest against each other, at their respective upper surfaces 2.3 and 3.3, which have complementary shapes. According to another embodiment, the parts 2 and 3 can be placed against each other by means of an additional piece disposed between said parts. When the second piece 3 is thus placed against the first piece 2, the upper portion 2.2 of said first piece 2 extends beyond the heel 3.1 of said second piece 3, for the action of the lock 6.
- the branch 4, at least partially deformable, is attached to the first part 2. It is more precisely fixed thereto by fastening means 7, for example a bolt and nut system through holes 4 1 and 2.4 respectively in branch 4 and the first part 2.
- This branch 4 comprises:
- a second portion 4.3 situated under the first portion 4.2, of high thickness (and therefore also of high mechanical strength), and of which at least a part is arranged facing the pyrotechnic means 5, and
- a third portion 4.4 located at the lower end 5 of the pyrotechnic means 5, the thickness of which (less than that of the second portion 4.3) is sufficiently small so that it is deformable under the action of said pyrotechnic means 5, but also high enough to prevent it from breaking under the action of these same means 5.
- the branch 4 is fixed to the first part 2 only by its lower part, the upper part of said branch 4 being left free vis-à-vis said first part 2 so that they can move away one of the other under the action of the pyrotechnic means 5.
- the pyrotechnic means 5 are formed of a pyrotechnic expansion tube 5, whose section is nominally oblong with flat sides, in which circulates a detonating cord that can be controlled remotely.
- This tube 5 is housed in a groove 8, with a U-shaped cross-section, the two side walls of which are respectively formed by a wall of the portion 2.1 of the first piece 2 and by a wall of the portion of high thickness. 4.3 of the branch 4.
- the tube 5 is more particularly placed on a set of studs (not shown) punctual, arranged in the bottom of the groove 8, to reduce the shock induced in the structure during the swelling of the pyrotechnic cord and from when protecting it against the risk of bursting
- the expansion tube 5 is able to inflate, the shape of its section tending to become substantially circular, which has the effect of deforming the branch 4 at the level of its reduced thickness portion 4.4. Due to the position of this portion 4.4 (at the lower end 5. 1 of the pyrotechnic means 5) and the position of the fastening means 7 (under the groove 8), there is then a pivoting of the branch 4 around of said portion 4.4. Thus, the upper part of the branch 4 - the portions 4.2 and 4.3 - move away from the first part 2.
- the latch 6 is formed of a bolt 9 comprising a tube 9.
- the bolt 9 also comprises a stud 9.2, of larger section than that of the tube 9. 1, disposed at the end of said tube 9. 1 which is located on the side of the second piece 3.
- the stud 9.2 is mounted slidably inside a cavity 2.6 formed in the upper portion 2.2 of the first piece 2, in the extension of the hole 2.5 but with a larger section than that of said hole 2.5.
- the stud 9.2 is partially inserted inside this cavity 2.6, in which it can thus slide together with the tube 9. 1 inside the hole 2.5.
- the bolt 9 of the lock 6 is able to move to take alternately two positions:
- the cavity 2.6 is deep enough so that, when the stud 9.2 abuts against the bottom wall of said cavity 2.6, it no longer flushes the upper part of the heel 3. 1 and the second part 3 is released.
- connection between the arm 4 and the lock 6 is effected by pressing a disk 10 fixed to the end of the pipe 9, the furthest from the second component 3, against the upper portion 4.2 of said branch 4.
- Mechanical return means 1 1 are also arranged around the tube 9. 1, between the disk 10 and the portion 2.2 of the first part 2.
- the return means 1 for example in the form of a mechanical spring, are in the loaded position.
- the tube 9. which thus relies on the portion 4.2 of the branch 4, is able to follow the movement of said portion 4.2, since when it moves away from the two parts 2 and 3, the return means 1 1 relax and push the disc 10.
- the return means 1 1 also push the tube 9. 1, which then continues to lean against the portion 5.2.
- the expansion of the return means 1 1 is at least equal to the play of the stud 9.2 inside the cavity 2.6, so that when the branch 4 moves away from the second part 3, said stud 9.2 can be sufficiently inserted into said cavity 2.6, under the effect of the relaxation of the return means January 1, until the bolt 9 of the lock 6 can reach its unlocked position.
- groove 8 is not closed and extends towards the upper part of the fixing device 1, which makes it possible to ensure that the upper part of the branch 4 is deformable by pivoting around the lower part. 4.4 of said branch 4.
- Figure 1 shows the case where the bolt 9 of the latch 6 is in its locking position, as the pyrotechnic means 5 are not activated.
- the branch 4 is not then deformed, the return means 1 1 are in a compression position and the stud 9.2 retains the heel 3.1 of the second piece 3 against the first piece 2.
- the bolt 9 transits to its unlocking position. More specifically, under the action of the swelling of the expansion tube 5 (whose section tends to change from an oblong shape to a substantially circular shape), the upper part of the branch 4 deforms substantially in the direction of the arrow F1 , that is to say in the direction of removal from the second part 3, by pivoting around the reduced area 4.4.
- the fixing device 1 ensures at the same time:
- FIGS. 4 to 6 An attachment device according to a second embodiment of the invention is now described with reference to FIGS. 4 to 6.
- This fastening device 1 is of the type similar to that of FIGS. 1 to 3, with however two notable differences.
- the branch 4 is not reported against the first piece 2, but is part of the latter.
- the groove 8 is delimited, at the location for the pyrotechnic means 5, by two side walls from the first part 2: the portion 2.1 and the branch 4.
- the branch 4 always has an upper portion 4.2 in connection with the lock 6, a portion of high thickness 4.3 opposite the pyrotechnic means 5 and a portion 4.4 of thin thickness just below said pyrotechnic means 5.
- the lock 6 still comprises a bolt 9 formed of a tube 9 and a stud 9.2, it also comprises a mechanical connection to a ball 1 2, fixed to the upper portion 4.2 of the branch 4, to the inside a 4.5 hole practiced in this same portion.
- This link 1 2 is also fixed to the end of the tube 9, 1 furthest from the second piece 3.
- This mechanical connection makes it possible to adapt the movement of the lock 6 with respect to the increase in the gap angular between the branch 4 (which is deformed by pivoting around the portion 4.4) and the bolt 9 (which slides along a fixed axis).
- the expansion tube 5 retains its oblong shape, the branch 4 is not deformed and the bolt 9 of the bolt 6 thus remains in its position. lock, for which the second piece 3 is fixed to the first 2 through the stud 9.2 which blocks the heel 3.1.
- the bolt 9 progressively moves from its locking position to its unlocking position. More specifically, the expansion tube 5 inflates so that its section becomes substantially circular, which causes the deformation of the branch 4 by pivoting around its reduced portion 4.4, in the direction and direction of the arrow F1.
- the ball joint 1 2 fixed to the branch 4, then pulls towards it (in the direction and in the direction of the arrow F2) the tube 9.1 and the stud 9.2, the latter being inserted inside the cavity 2.6 .
- part of the stud 9.2 is always flush with the upper face of the heel 3.1 of the second piece 3, which always blocks said piece 3.
- the bolt 9 reaches its unlocking position, the branch 4 being sufficiently deformed in the direction and direction of the arrow F1 so that the bolt 9.2 is fully inserted inside the bolt 9. the cavity 2.6, by the action of the ball joint 1 2 which pulls the bolt 9 while compensating for the effects of angular spacing between the arm 4 and said bolt 9.
- the stud 9.2 then does not flush the heel 3. 1 of the second piece 3, which is thus made free of movement and away from the first piece 2, substantially in the direction and direction of the arrow F3.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Aviation & Aerospace Engineering (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Clamps And Clips (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
- Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1003329A FR2963803B1 (fr) | 2010-08-10 | 2010-08-10 | Dispositif de fixation a verrou pyrotechnique |
PCT/FR2011/051815 WO2012020191A1 (fr) | 2010-08-10 | 2011-07-27 | Dispositif de fixation à verrou pyrotechnique |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2603766A1 true EP2603766A1 (fr) | 2013-06-19 |
EP2603766B1 EP2603766B1 (fr) | 2014-06-18 |
Family
ID=43734126
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11752311.8A Active EP2603766B1 (fr) | 2010-08-10 | 2011-07-27 | Dispositif de fixation à verrou pyrotechnique |
Country Status (5)
Country | Link |
---|---|
US (1) | US8967030B2 (fr) |
EP (1) | EP2603766B1 (fr) |
ES (1) | ES2481891T3 (fr) |
FR (1) | FR2963803B1 (fr) |
WO (1) | WO2012020191A1 (fr) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2946101B1 (fr) * | 2009-05-29 | 2011-07-01 | Astrium Sas | Dispositif de liaison provisoire et de separation pyrotechnique de deux ensembles |
FR2969748B1 (fr) * | 2010-12-22 | 2013-01-25 | Astrium Sas | Piece a rupture pyrotechnique detonante reversible |
DE102012107580C5 (de) * | 2012-08-17 | 2019-10-10 | Krauss-Maffei Wegmann Gmbh & Co. Kg | Vorrichtung und Verfahren zum Koppeln von einem Anbaugerät an einem Fahrzeug |
CN104406457B (zh) * | 2014-12-11 | 2016-05-18 | 晋西工业集团有限责任公司 | 一种剪切式断裂螺钉可拆卸机构 |
US20160356586A1 (en) * | 2015-06-02 | 2016-12-08 | Fast Brass, Llc | Shell retaining assembly |
SE540399C2 (sv) * | 2016-04-20 | 2018-09-11 | Bae Systems Bofors Ab | Stödanordning för delningsbar fallskärmsgranat |
SE541612C2 (sv) * | 2016-09-15 | 2019-11-12 | Bae Systems Bofors Ab | Modifierbar delningsbar projektil och metod för att modifiera en projektil |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2617464B1 (fr) * | 1987-07-03 | 1990-02-16 | Thomson Brandt Armements | Dispositif de fermeture ejectable, notamment pour roquettes a sous-munitions |
FR2741710B1 (fr) * | 1995-11-28 | 1998-01-02 | Tda Armements Sas | Systeme de separation de troncons d'engin a deverrouillage mecanique et echappement aerodynamique |
FR2838818B1 (fr) | 2002-04-19 | 2006-12-08 | Eads Launch Vehicules | Dispositif de liaison provisoire et de separation pyrotechnique de deux elements, sans rupture |
US7367738B2 (en) * | 2002-09-23 | 2008-05-06 | The Boeing Company | Apparatus and method for releaseably joining elements |
-
2010
- 2010-08-10 FR FR1003329A patent/FR2963803B1/fr active Active
-
2011
- 2011-07-27 WO PCT/FR2011/051815 patent/WO2012020191A1/fr active Application Filing
- 2011-07-27 ES ES11752311.8T patent/ES2481891T3/es active Active
- 2011-07-27 EP EP11752311.8A patent/EP2603766B1/fr active Active
- 2011-07-27 US US13/813,531 patent/US8967030B2/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2012020191A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20130199359A1 (en) | 2013-08-08 |
EP2603766B1 (fr) | 2014-06-18 |
ES2481891T3 (es) | 2014-07-31 |
US8967030B2 (en) | 2015-03-03 |
WO2012020191A1 (fr) | 2012-02-16 |
FR2963803A1 (fr) | 2012-02-17 |
FR2963803B1 (fr) | 2017-02-10 |
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