EP3025117A1 - Obturator ring with interlocking segments - Google Patents
Obturator ring with interlocking segmentsInfo
- Publication number
- EP3025117A1 EP3025117A1 EP14790458.5A EP14790458A EP3025117A1 EP 3025117 A1 EP3025117 A1 EP 3025117A1 EP 14790458 A EP14790458 A EP 14790458A EP 3025117 A1 EP3025117 A1 EP 3025117A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- obturator
- segments
- projectile
- segment
- launch tube
- 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
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 230000008439 repair process Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 17
- 230000003466 anti-cipated effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000009420 retrofitting Methods 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B14/00—Projectiles or missiles characterised by arrangements for guiding or sealing them inside barrels, or for lubricating or cleaning barrels
- F42B14/02—Driving bands; Rotating bands
Definitions
- This invention relates to an apparatus and method for sealing gas between a projectile and a launch tube during the launch of the projectile from the launch tube.
- An obturator seals high pressure gas between a projectile and a wall of a launch tube. Providing a good gas seal increases the gas pressure in the launch tube, which increases the projectile's velocity at launch.
- the obturator preferably falls off the projectile after the obturator exits the launch tube. Sometimes the obturator fails to release from the projectile, thereby increasing drag and weight of the projectile, and possibly unbalancing the projectile, thereby reducing its range and accuracy.
- the present invention provides an obturator ring that is formed of self-locking interlocking segments that create an effective gas seal when constrained in a launch tube and separate from one another and the projectile in a predictable manner and of a uniform size when they exit the launch tube behind the projectile.
- the present invention provides an obturator that can be secured to a projectile to be launched from within a launch tube, the obturator cooperating with the projectile to seal a pressurized gas within the launch tube during launch.
- the obturator includes two or more segments that combine to define a ring. Each segment includes connecting features that cooperate with corresponding connecting features of an adjacent segment to restrict relative circumferential movement without restricting radially outward movement of individual segments.
- At least two of the segments, and potentially all of the segments, are identical.
- the identical segments can be symmetric about a line of symmetry.
- the connecting features can include interlocking arms, or a tab and a corresponding slot.
- the connecting features restrict circumferential movement of the connected segments.
- An exemplary obturator ring is cylindrical. Accordingly, the segments have an arcuate shape.
- the obturator can be combined with a projectile, where the obturator is mounted on the projectile.
- the obturator further can be combined with a launch tube, where the projectile and the obturator are installed in the launch tube.
- the present invention also provides an obturator with two or more segments that cooperate to define a ring, and each segment includes means for connecting to an adjacent segment to restrict relative circumferential movement without restricting radially outward movement of individual segments.
- the connecting means can include connecting features on each segment that cooperate with corresponding connecting features of an adjacent segment to connect adjacent segments together.
- the present invention also provides a method of making an obturator.
- the method includes the steps of moving a plurality of segments radially inwardly to connect adjacent segments until the segments combine to form a substantially continuous ring.
- the segments include connecting features that cooperate with corresponding connecting features of an adjacent segment to restrict relative circumferential movement without restricting radially outward movement of individual segments.
- FIG. 1 is a perspective view of an exemplary obturator provided by the present invention.
- FIG. 2 is a plan view of the obturator of FIG. 1 .
- FIG. 3 is a plan view of another exemplary obturator provided by the invention.
- FIG. 4 is a top view of the obturator of FIG. 1 .
- FIG. 5 is a schematic top view of the obturator of FIG. 4 illustrating the separation of individual segments.
- FIG. 6 is a schematic illustration of the obturator of FIG. 3 mounted on a projectile in a launch tube, the launch tube constraining the obturator to provide a gas seal between the projectile and the launch tube.
- FIG. 7 is a schematic illustration of the obturator of FIG. 6 showing the well- ordered separation of the obturator segments as the projectile exits the launch tube.
- the present invention provides an obturator ring that is formed of interlocking segments that create an effective gas seal when constrained in a launch tube and separate from one another and the projectile in a predictable manner when they exit the launch tube.
- launch tube includes any tubular structure from which a projectile is launched, including a rocket launch tube, a missile launch tube, a gun barrel, a mortar launch tube, etc.
- the present invention also is applicable to other devices that move through a tubular space where it is desirable to have a seal between the device and the walls of the tube, such as a "pig" in a pipeline.
- FIG. 1 An exemplary obturator 10 is shown in FIG. 1 .
- the obturator 10 includes a two or more segments 12 joined together to form a substantially continuous ring 14.
- the segments 12 fit together, each segment 12 connecting with an adjacent segment 12, like the pieces of a puzzle.
- Each segment 12 is identical and can be connected to an adjacent segment 12, which means that the segments 12 are easier to assemble into a ring.
- the material used to make the obturator segments 12 can vary from polymeric to metallic depending on use, such as the anticipated high temperature of the launch tube, the anticipated pressures, etc.
- Each segment 12 has a longitudinal dimension, or length, aligned with a circumferential direction 16.
- the circumferential direction 16 is parallel to the circumference of the assembled ring 14.
- Each segment 12 also has a width dimension 18 transverse the length dimension 16, and a thickness dimension 20 generally perpendicular to the length dimension 16 and the width dimension 18.
- the illustrated ring 14 is cylindrical, but could also be formed by a hollow conical section.
- the interlocking segments 12 need to maintain a close corresponding shape relative to the inner surface of the launch tube. Accordingly, the segments 12 generally have an arcuate, nonplanar shape on at least an outer surface.
- the segments 12 have respective connecting features for connecting adjacent segments. Two variations are shown in FIGS. 2 and 3. These connecting features interlock and interfere with the connecting features of an adjacent segment to prevent the segments 12 from separating in the circumferential direction.
- the segments 12 are connected in a direction that is transverse the circumferential direction, generally parallel to the thickness dimension 20, a direction that corresponds to a radial direction when the ring 14 is assembled. As a result, the ring 14 is strong
- the segments 12 readily separate when moved radially outwardly, as shown in FIGS. 4 and 5.
- the interlocking nature of the segments 12 also prevents the segments 12 from distorting in shape under the influence of the hot launch gases, thereby ensuring a high quality seal.
- the connecting features of the obturator 10 include a bulbous tab 24 that is received in a correspondingly-shaped slot 26 in an adjacent segment.
- the slot 26 is a negative image of the tab 24. Similar shapes can be found in puzzle pieces.
- a line 30 can be drawn parallel to the circumferential direction 16, toward an edge of the tab 24, that extends through the tab 24 and a portion of the adjacent segment 12 before returning to the tabbed segment 12. The portion of the adjacent segment and the tab 24 thus interfere with each other in the circumferential direction 16 and prevent the adjacent segments 12 from separating along the circumferential direction 16.
- the segments 12 are symmetric about a centrally-located circumferential line of symmetry 32.
- An alternative embodiment of and obturator 40 provided by the invention has a plurality of identical segments 42 with different connection features.
- the connecting features include interlocking arms 44 and 46 extending from respective segments 42.
- the segments 42 shown in FIG. 3 do not have symmetric shapes.
- the arms 44 and 46 on each end of each segment 42 extend in opposite directions.
- An upwardly-extending arm 46 of each segment 42 defines a cavity 54 between the arm and 46 the body of the segment 42.
- a downwardly-extending arm 44 on an opposite side of each segment 42 defines a cavity 56 between the arm 44 and the body of the segment 42.
- the arm of one segment is a negative image of the cavity formed by the arm of the adjacent segment.
- the arms 44 and 46 of the adjacent segments 42 can be received in respective cavities 54 and 56, tying the segments 42 together.
- the segments 42 move laterally (parallel to the width dimension 18 (FIG. 1 )), in such a manner as to disengage their arms 44 and 46, if only two segments 42 were connected together in this manner.
- the oppositely-extending arms 44 and 46 on the other side of the segment 42 prevent such lateral disengagement.
- the connecting features can allow a limited, restricted amount of movement between adjacent segments 12 or 42 in the circumferential direction 16. This movement can be permitted through limited flexing of the connecting features or a predetermined amount of looseness in the connection. In either case, however, the connecting features prevent the segments 12 or 42 from separating as they attempt to move away from each other in the circumferential direction 16.
- a joint line 50 follows a convoluted path to enhance the obturator ring's gas sealing properties.
- the obturator 10 forms a ring 14.
- the obturator 14 is assembled by moving a plurality of segments 12 radially inwardly to connect adjacent segments 12 serially, one segment 12 to an adjacent segment, until the last segment is connected to the first segment to form a substantially continuous ring 14.
- a plurality of segments 12 also can be connected together to form a belt, which then can be wrapped around a projectile and secured in place by connecting the segments from opposite ends of the series of segments 12 that make up the belt.
- the segments 12 or 42 lock together sufficiently tightly to withstand handling of the projectile without significant risk that the obturator 10 or 40 would separate from the projectile prior to launch.
- the assembled segmented ring 14 (FIG. 1 ) also can be heated during assembly or before assembly on the projectile to further ensure that the segments 12 stay connected together. As shown in FIG. 5, the segments 12 readily separate as they each move radially outward.
- FIG. 6 shows an obturator 40 provided by the invention assembled on a schematic projectile 60 within a launch tube 62.
- hot gases generated by the launch or centrifugal force generated during the launch cause the obturator ring 40 to radially expand and the segments 42 move radially outward to seal a gap between the projectile 60 and an inner wall of the launch tube 62, trapping the hot gases generated at launch within the launch tube 62.
- a projectile can be made to spin by a launch tube with a rifled bore or features of the projectile designed to induce spin about a longitudinal axis.
- a spinning projectile generally will move along a straighter path.
- the expansion of the obturator 40 is restricted by the inner surface of the launch tube 62, which ensures that the obturator 40 maintains an effective seal between the inner surface of the launch tube 62 and the outer surface of the projectile 60.
- the obturator 40 engraves into the inside surface of the launch tube 62 during launch, ensuring a tight seal.
- the hot gases remain trapped behind the obturator 40 until the obturator 40 escapes the launch tube 62, thereby maximizing the transfer of energy from the hot gases to the projectile 60.
- the inside surface of the launch tube 62 no longer restricts the outward movement of the obturator segments 42. So as the obturator 40 exits the launch tube 62 the captive launch gases or centripetal force will cause the segments 42 to move radially outward and separate from one another and the projectile 60, as illustrated in FIGS. 5 and 7.
- the controlled failure of the obturator in this manner generally causes the obturator to separate from the projectile into a plurality of relatively small segments of uniform size.
- the small, uniformly-sized segments minimize the chance of a mass imbalance as the segments separate from the projectile.
- the obturator thus shown and described can be installed and replaced in the field, thereby simplifying the projectile manufacturing process and allowing projectiles to be outfitted with obturators in the field, including retrofitting projectiles to
- an obturator 10, 40 can be secured to a projectile 60 to be launched from within a launch tube 62.
- the obturator 10, 40 cooperates with the projectile 60 to seal a pressurized gas within the launch tube during launch.
- the obturator 40 has a plurality of segments 12, 42 that combine to form a ring 14. Each segment 12, 42 has connecting features that cooperate with corresponding
- each segment 12, 42 is identical, making it easier to repair and assemble the obturator 10, 40.
- the obturator segments 12, 42 can move radially outwardly to separate into relatively small, uniformly-sized pieces.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Pipe Accessories (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US2014/060806 WO2016060665A1 (en) | 2014-10-16 | 2014-10-16 | Obturator ring with interlocking segments |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3025117A1 true EP3025117A1 (en) | 2016-06-01 |
EP3025117B1 EP3025117B1 (en) | 2017-09-06 |
Family
ID=51830655
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14790458.5A Active EP3025117B1 (en) | 2014-10-16 | 2014-10-16 | Obturator ring with interlocking segments |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3025117B1 (en) |
WO (1) | WO2016060665A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE2200129A1 (en) * | 2022-11-11 | 2024-05-12 | Bae Systems Bofors Ab | OBTURATOR RING |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4424748A (en) * | 1981-08-07 | 1984-01-10 | The United States Of America As Represented By The Secretary Of The Army | Segmented seal for discarding sabot ammunition |
DE3248011C1 (en) * | 1982-12-24 | 1984-09-20 | Karl Schmidt Gmbh, 7107 Neckarsulm | Guide tape for projectiles |
US6419235B1 (en) * | 1999-05-18 | 2002-07-16 | The United States Of America As Represented By The Secretary Of The Army | Segmented obturator ring |
-
2014
- 2014-10-16 EP EP14790458.5A patent/EP3025117B1/en active Active
- 2014-10-16 WO PCT/US2014/060806 patent/WO2016060665A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
WO2016060665A1 (en) | 2016-04-21 |
EP3025117B1 (en) | 2017-09-06 |
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