The present disclosure relates to inflatable evacuation slides and, in particular, to restraint release systems and methods for restraining evacuation slides.
Emergency evacuation slides may be used to exit an aircraft absent a jet way or other suitable means of egress for passengers. The slides may deploy from a door sill or a side of the aircraft fuselage, for example. The slide deployment is controlled by restraints placed throughout the length of the slide which release in stages in response to internal slide pressure.
In various embodiments, a releasable restraint for an evacuation system is disclosed. A releasable restraint for an evacuation system may comprise a first stem connected to a first bead, and a second stem connected to a second bead, wherein a diameter of the second stem is different from a diameter of the first stem.
In various embodiments, the releasable restraint may comprise a single unibody member. The single unibody member may comprise a female fastener, a plurality of beads including the first bead and the second bead, and a plurality of stems, including the first stem and the second stem, connecting the plurality of beads, wherein the beads and the stems are configured to allow the beads to move through the female fastener in a first direction while preventing the beads from moving through the female fastener in a second direction opposite of the first direction. The plurality of stems may be configured to be frangible at selected tensile loads. The selected tensile loads may increase along the single unibody member in the second direction. The releasable restraint may be in operable communication with the evacuation system and a diameter of a stem connected to a last bead through the female fastener may define a load associated with releasing the releasable restraint during deployment of the evacuation system.
In various embodiments, the releasable restraint may comprise nylon. At least one of a color or a shape of at least one of the first bead or the first stem may indicate a tensile strength of the first stem and may be different from at least one of a color or a shape of at least one of the second bead or the second stem. A ratio of the diameter of the first stem to the diameter of the second stem may be between 6:5 and 7:1.
In various embodiments, the releasable restraint may further comprise a third stem connected to a third bead, wherein a diameter of the third stem may be different from the diameter of the first stem and the diameter of the second stem.
In various embodiments, an evacuation system may comprise an evacuation slide, a first strap coupled to the evacuation slide, a second strap coupled to the evacuation slide, and a releasable restraint extending through the first strap and the second strap, the releasable restraint comprising a first stem connected to a first bead and a second stem connected to a second bead, wherein a diameter of the second stem is different from a diameter of the first stem.
In various embodiments, the releasable restraint may further comprise a female fastener configured to receive and retain a plurality of beads of the releasable restraint, the plurality of beads including the first bead and the second bead, a diameter of a stem connected to a last bead received by the female fastener may define a load associated with releasing the releasable restraint during deployment of the evacuation system.
In various embodiments, at least one of a color or a shape of the first bead may indicate the diameter of the first stem and may be different from at least one of a color or a shape of the second bead. The first stem may be configured to separate in response to a first tensile force and the second stem maybe configured to separate in response to a second tensile force greater than the first tensile force. The diameter of the first stem may be between 0.05 inches and 0.13 inches. The diameter of the second stem may be between 0.09 inches and 0.345 inches.
In various embodiments, a method for restraining an evacuation slide may comprise extending a releasable restraint through a first strap coupled to the evacuation slide, and extending the releasable restraint through a second strap coupled to the evacuation slide, the releasable restraint comprising a first stem connected to a first bead, and a second stem connected to a second bead, wherein a diameter of the second stem is different from a diameter of the first stem.
In various embodiments the method may further comprise configuring a female fastener of the releasable restraint to receive and retain a plurality of beads of the releasable restraint, the plurality of beads including the first bead and the second bead, wherein a diameter of a stem connected to a last bead received by the female fastener may define a load associated with releasing the releasable restraint. The method may further comprise indicating at least one of a diameter or a tensile strength of the first stem using at least one of a color or a shape of the first bead. A ratio of the diameter of the first stem to the diameter of the second stem may be between 6:5 and 7:1.
The foregoing features and elements may be combined in various combinations without exclusivity, unless expressly indicated otherwise. These features and elements as well as the operation thereof will become more apparent in light of the following description and the accompanying drawings. It should be understood, however, the following description and drawings are intended to be exemplary in nature and non-limiting.
The subject matter of the present disclosure is particularly pointed out and distinctly claimed in the concluding portion of the specification. A more complete understanding of the present disclosure, however, may best be obtained by referring to the detailed description and claims when considered in connection with the figures, wherein like numerals denote like elements.
The detailed description of exemplary embodiments herein makes reference to the accompanying drawings, which show exemplary embodiments by way of illustration. While these exemplary embodiments are described in sufficient detail to enable those skilled in the art to practice the exemplary embodiments of the disclosure, it should be understood that other embodiments may be realized and that logical changes and adaptations in design and construction may be made in accordance with this disclosure and the teachings herein. Thus, the detailed description herein is presented for purposes of illustration only and not limitation. The steps recited in any of the method or process descriptions may be executed in any order and are not necessarily limited to the order presented.
Furthermore, any reference to singular includes plural embodiments, and any reference to more than one component or step may include a singular embodiment or step. Also, any reference to attached, fixed, connected or the like may include permanent, removable, temporary, partial, full and/or any other possible attachment option. Additionally, any reference to without contact (or similar phrases) may also include reduced contact or minimal contact. Surface cross hatching lines may be used throughout the figures to denote different parts but not necessarily to denote the same or different materials.
Slides according to the present disclosure may extend from an aircraft structure, such as a fuselage or a wing, for example, to an exit surface in a fully deployed position. During deployment, a plurality of restraints may aid in controlling the inflation process of the slide. The restraints may be configured to de-couple in response to internal slide pressure. A releasable restraint is provided in various embodiments. Releasable restraints, according to the present disclosure, may provide weight savings, reduced packaging density, decreased cost, and increased restraint dependability.
With respect to
With reference to
With reference to
With reference to
In various embodiments, releasable restraints 150 and 1502 may be configured to separate in response to an internal pressure in evacuation slide 104. For example, a gas cylinder may supply a flow of pressurized fluid to evacuation slide 104 in response to evacuation slide 104 being deployed. Evacuation slide 104 may begin to inflate and an internal pressure of evacuation slide 104 may increase. Releasable restraints 150 and 1502 may maintain evacuation slide 104 in a folded position until the internal pressure has increased above a predetermined threshold value. Releasable restraints 150 and 1502 may separate once the internal pressure of evacuation slide 104 has increased above the predetermined threshold value. In various embodiments, second releasable restraint 1502 may be configured to separate in response to a different (e.g., greater) internal pressure than releasable restraint 150. Evacuation slide 104 may unfold in response to releasable restraints 150 and 1502 separating. In this regard, evacuation slide 104 may fully deploy in response to releasable restraints 150 and 1502 separating. As described in further detail below, releasable restraint 150 may include one or more stems having a first diameter (i.e., first stems) and one or more second stems having a second diameter greater than the first diameter (i.e., second stems). Similarly, second releasable restraint 1502, which is similar to releasable restraint 150, may include one or more stems having the first diameter (i.e., third stems) and one or more stems having the second diameter (i.e., fourth stems).
In various embodiments, releasable restraint 150 may form a loop through which a first strap 152 and a second strap 154 are located. First strap 152 may be coupled between evacuation slide 104 and releasable restraint 150. Second strap 154 may be coupled between evacuation slide 104 and releasable restraint 150. In various embodiments, first strap 152 and/or second strap 154 may comprise a rope, tape, ribbon, webbing, or any other suitable strap. In various embodiments, first strap 152 and/or second strap 154 may comprise nylon, ballistic nylon, polypropylene, polyester, cotton, or any other suitable material. In various embodiments, second releasable restraint 1502 is coupled to a third strap 153 and a fourth strap 155 in a similar manner.
In various embodiments, a first cover 156 and/or a second cover 158 may surround releasable restraint 150. Second cover 158 may surround at least a portion of first cover 156. First cover 156 and second cover 158 may comprise a fabric. For example, first cover 156 and second cover 158 may comprise nylon, ballistic nylon, polypropylene, polyester, cotton, or any other suitable material.
With reference to
In various embodiments, an end 180 of first strap 152 may be sewn or otherwise secured to first strap 152 to form a first loop 182. An end 184 of second strap 154 may be sewn or otherwise secured to second strap 154 to form a second loop 186. Loop 182 and loop 186 may couple first strap 152 and second strap 154, respectively, to releasable restraint 150. Lead end 162 of releasable restraint 150 may be extended through first loop 182 and second loop 186 and fastened with one or more beads 164 to female fastener 160.
With reference to
Returning to
In various embodiments, each stem 166 may include a diameter that is different from a diameter of the stems directly adjacent to it. In other words, a diameter of stem 166a may be greater than a diameter of stem 166b; a diameter of stem 166b may be greater than a diameter of stem 166c and less than a diameter of stem 166a; a diameter of stem 166c may be greater than a diameter of stem 166d and less than a diameter of stem 166b, and so on.
The diameter of each stem 166 may be directly related to the tensile force and/or tensile load associated with separating or breaking the stem, such that a greater tensile force and/or tensile load is associated with separating stems having a larger diameter. For example, a greater tensile force and/or tensile load may be associated with separating stem 166a than is associated with separating stem 166b or than is associated with separating stem 166c. In various embodiments, a first stem proximate to female fastener 160 (e.g., stem 166c) may separate at a selected tensile load of between 80 pounds and 150 pounds (i.e., between 356 N and 667 N) and a second stem more distal to female fastener 160 than the first stem (e.g., stems 166d-166h) may separate at a selected tensile load of between 10 pounds and 50 pounds (i.e., between 44 N and 222 N). The selected tensile loads may increase along single unibody member 151 in a direction opposite of arrow 167.
In various embodiments, stems 166 may be grouped by diameter and/or tensile strength. For example, a first group of stems 166 proximate to female fastener 160 (e.g., stems 166a, 166b, and 166c) may have a same first diameter and/or same first tensile strength, and a second group stems more distal to female fastener 160 than the first group of stems (e.g., stems 166d, 166e, and 1660 may have a same second diameter and/or same second tensile strength, and a third group stems more distal to female fastener 160 than the first group of stems and the second group of stems (e.g., stems 166g and 166h) may have a same third diameter and/or a same third tensile strength, and the first diameter and the first tensile strength are greater than the second diameter and the second tensile strength, respectively, and the second diameter and the second tensile strength are greater than the third diameter and third tensile strength, respectively.
In various embodiments, a first shape and/or a first color of a first bead (e.g., bead 164c) of releasable restraint 150 may indicate a tensile strength of the stem (e.g., stem 166c) connected to the first bead, and a second shape and/or a second color of a second bead (e.g., 164g) may indicate a tensile strength of the stem connected to the second bead. For example, a first shape (e.g., conical) and/or a first color (e.g., red) of a bead 164c may indicate a tensile load (e.g., 60 pounds (267 N)) associated with separating stem 166c, and a second shape (e.g., spherical) and/or a second color (e.g., green) of bead 164f may indicate a tensile load (e.g., 15 pounds (68 N)) associated with separating stem 166f.
In various embodiments, a first cross-sectional shape and/or a first color of a first stem may indicate a tensile strength of the first stem, and a second cross-sectional shape and/or a second color of a second stem may indicate a tensile strength of the second stem. For example, a first cross-sectional shape (e.g., circular) and/or a first color (e.g., red) of stem 166c may indicate a tensile load (e.g., 300 pounds (1334 N)) associated with separating stem 166c, and a second cross-sectional shape (e.g., triangular) and/or a second color (e.g., green) of stem 166g may indicate a tensile load (e.g., 100 pounds (445 N)) associated with separating stem 166g.
In various embodiments, a first shape and/or a first color of a first bead may indicate a diameter of the stem connected to the first bead, and a second shape and/or a second color of a second bead may indicate a diameter of the stem connected to the second bead. For example, a first shape (e.g., conical) and/or a first color (e.g., red) of bead 164c may indicate a diameter (e.g., 0.13 inches (3.30 mm)) of stem 166c, and a second shape (e.g., triangular, hexagonal, etc.) and/or a second color (e.g., green) of bead 164g may indicate a diameter (e.g., 0.09 inches (2.29 mm)) of stem 166g.
In various embodiments, a first cross-sectional shape and/or a first color of a first stem may indicate a diameter of the first stem, and a second cross-sectional shape and/or a second color of a second stem may indicate a diameter of the second stem. For example, a first cross-sectional shape (e.g., circular) and/or a first color (e.g., red) of stem 166c may indicate a diameter (e.g., 0.345 inches (8.763 mm)) of stem 166c, and a second cross-sectional shape (e.g., triangular) and/or a second color (e.g., green) of stem 166g may indicate a diameter (e.g., 0.09 inches (2.29 mm)) of stem 166g.
In various embodiments, a ratio of a tensile strength of a first stem (e.g., stem 166b) to a tensile strength of a second stem (e.g. stem 166g), more distal to the female fastener 160 than the first stem, may be between 12:11 and 25:1. In various embodiments, a ratio of a tensile strength of a first stem (e.g., stem 166b) to a tensile strength of a second stem (e.g. stems 166g), more distal to the female fastener 160 than the first stem, may be between 8:7 and 10:1. In various embodiments, a ratio of a tensile strength of a first stem (e.g., stem 166b) to a tensile strength of a second stem (e.g., 166g), more distal to the female fastener 160 than the first stem, may be between 3:2 and 7:1. In various embodiments, a ratio of a tensile strength of a first stem (e.g., stem 166b) to a tensile strength of a second stem (e.g., 166g), more distal to the female fastener 160 than the first stem, may be between 3:2 and 4:1.
In various embodiments, a ratio of a diameter of a first stem (e.g., stem 166c) to a diameter of a second stem (e.g., stem 166h), more distal to the female fastener 160 than the first stem, may be between 13:12 and 8:1. In various embodiments, a ratio of a diameter of a first stem (e.g., stem 166c) to a diameter of a second stem (e.g., stem 166h), more distal to the female fastener 160 than the first stem, may be between 6:5 and 7:1. In various embodiments, a ratio of a diameter of a first stem (e.g., stem 166c) to a diameter of a second stem (e.g., stem 166h), more distal to the female fastener 160 than the first stem, may be between 6:5 and 2:1. In various embodiments, a ratio of a diameter of a first stem (e.g., stem 166c) to a diameter of a second stem (e.g., stem 166h), more distal to the female fastener 160 than the first stem, may be between 6:5 and 9:5.
In various embodiments, a first ratio of a tensile strength of a first stem (e.g., stem 166b) to a tensile strength of a second stem (e.g., stem 166c) adjacent to the first stem may be less than a second ratio of the tensile strength of the first stem to a tensile strength of a third stem (e.g., stem 166g) more distal to female fastener 160 than the first stem and second stem. In various embodiments, a first ratio of a tensile strength of a first stem (e.g., stem 166b) to a tensile strength of a second stem (e.g., stem 166c) adjacent to the first stem may be between 8:7 and 2:1, and a second ratio of the tensile strength of the first stem to a tensile strength of a third stem (e.g., stem 166g) more distal to female fastener 160 than the first stem and second stem may be between 2:1 and 25:1. For example, a first ratio of a tensile strength of stem 166b to a tensile strength of stem 166c may be 6:5 and a second ratio of the tensile strength of stem 166b to a tensile strength of stem 166g may be 7:1.
In various embodiments, a first ratio of a diameter of a first stem (e.g., stem 166b) to a diameter of a second stem (e.g., stem 166c) adjacent to the first stem may be less than a second ratio of the diameter of the first stem to a diameter of a third stem (e.g., stem 166g) more distal to female fastener 160 than the first stem and the second stem. In various embodiments, a first ratio of a diameter of a first stem to a diameter of a second stem adjacent to the first stem may be between 13:12 and 6:5, and a second ratio of the diameter of the first stem to a diameter of a third stem (e.g., stem 166g) more distal to female fastener 160 than the first stem and second stem may be between 7:5 and 8:1. For example, a first ratio of a diameter of stem 166b to a diameter of stem 166c may be 12:11 and a second ratio of the diameter of stem 166b to a diameter of stem 166g may be 3:1.
With reference to
With reference to
In various embodiments, stems 166 may comprise frangible members. Stems 166 may be figured to be frangible at a selected tensile load 190. The selected tensile loads may increase along single unibody member 151 in the direction of arrow 174 (
In various embodiments, a number of beads 164 received by female fastener 160 may indicate a load associated with releasing or breaking releasable restraint 150. For example, with momentary reference to
In various embodiments, a number of beads 164 received by female fastener 160 may indicate a diameter of the stem 166L associated with releasing or breaking releasable restraint 150. For example, with momentary reference to
In various embodiments, stems 166 along releasable restraint 150 may vary in diameter such that releasable restraint 150 may be configured, based on the last bead 164L extended through female fastener 160, to separate in response to a tensile force 190 of between 10 pounds and 250 pounds (i.e., between 44 N and 1112 N), and in various embodiments in response to a tensile force 190 of between 10 pounds and 150 pounds (i.e., between 44 N and 667 N), and in various embodiments, in response to a tensile force of between 10 pounds and 70 pounds (i.e., between 44 N and 311 N). In various embodiments, stems 166 along releasable restraint 150 may vary in diameter and/or tensile strength such that releasable restraint 150 may be configured, depending on the last bead 164L extended through female fastener 160 (and thus the stem 166L connected to the last bead 164L located through female fastener 160), to separate in response to any suitable tensile force 190 greater than zero.
In various embodiments, a plurality of releasable restraints 150 may be provided in parallel to withstand a predetermined force or selected tensile load. For example, if it is desired that a restraint release or separate at about 600 pounds (i.e., about 2669 N), two releasable restraints configured to withstand 300 pounds (1334 N) may be provided in parallel to withstand the 600 pound (2669 N) force. In response to a tensile force greater than 600 pounds (i.e., greater than 3669 N), the two restraints may release or break, allowing an evacuation system to fully deploy.
With reference to
In various embodiments, with combined reference to
Benefits and other advantages have been described herein with regard to specific embodiments. Furthermore, the connecting lines shown in the various figures contained herein are intended to represent exemplary functional relationships and/or physical couplings between the various elements. It should be noted that many alternative or additional functional relationships or physical connections may be present in a practical system. However, the benefits, advantages, and any elements that may cause any benefit or advantage to occur or become more pronounced are not to be construed as critical, required, or essential features or elements of the disclosure. The scope of the disclosure is accordingly to be limited by nothing other than the appended claims, in which reference to an element in the singular is not intended to mean “one and only one” unless explicitly so stated, but rather “one or more.” Moreover, where a phrase similar to “at least one of A, B, or C” is used in the claims, it is intended that the phrase be interpreted to mean that A alone may be present in an embodiment, B alone may be present in an embodiment, C alone may be present in an embodiment, or that any combination of the elements A, B and C may be present in a single embodiment; for example, A and B, A and C, B and C, or A and 13 and C.
Systems, methods and apparatus are provided herein. In the detailed description herein, references to “various embodiments”, “one embodiment”, “an embodiment”, “an example embodiment”, etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described. After reading the description, it will be apparent to one skilled in the relevant art(s) how to implement the disclosure in alternative embodiments.
Furthermore, no element, component, or method step in the present disclosure is intended to be dedicated to the public regardless of whether the element, component, or method step is explicitly recited in the claims. No claim element is intended to invoke 35 U.S.C. 112(f) unless the element is expressly recited using the phrase “means for.” As used herein, the terms “comprises”, “comprising”, or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Number | Name | Date | Kind |
---|---|---|---|
3391771 | Day | Jul 1968 | A |
3597803 | Van Neil | Aug 1971 | A |
3606939 | Summer et al. | Sep 1971 | A |
3830538 | Moberg | Aug 1974 | A |
3897861 | Miller | Aug 1975 | A |
3944023 | Fisher | Mar 1976 | A |
3973645 | Dix | Aug 1976 | A |
4001919 | Moberg | Jan 1977 | A |
4460062 | Fisher | Jul 1984 | A |
4526262 | Malcolm | Jul 1985 | A |
4567977 | Fisher | Feb 1986 | A |
D376967 | Fuller | Dec 1996 | S |
5711495 | Danielson | Jan 1998 | A |
5871180 | Hublikar | Feb 1999 | A |
6174006 | Burt | Jan 2001 | B1 |
6449808 | Zappa | Sep 2002 | B1 |
6640393 | Wendle | Nov 2003 | B2 |
8066108 | Hentges | Nov 2011 | B2 |
8480140 | Zhang | Jul 2013 | B2 |
8555467 | Kelly | Oct 2013 | B2 |
D745225 | Siria-Womach | Dec 2015 | S |
20030088949 | Barriuso | May 2003 | A1 |
20040094361 | Gronlund | May 2004 | A1 |
20080066265 | Pilon | Mar 2008 | A1 |
20130200217 | Biro | Aug 2013 | A1 |
20140224937 | Brown | Aug 2014 | A1 |
20180201380 | Haynes | Jul 2018 | A1 |
20180327101 | Haynes | Nov 2018 | A1 |
20180334256 | Haynes | Nov 2018 | A1 |
Number | Date | Country |
---|---|---|
0110206 | Jun 1983 | EP |
1900648 | Mar 2008 | EP |
0068921 | Nov 2000 | WO |
0213165 | Feb 2002 | WO |
Entry |
---|
European Patent Office, European Search Report dated May 24, 2018 in Application No. 18163417.1-1010. |
European Patent Office, European Office Action dated dated Sep. 4, 2019 in Application No. 18163417.1. |
Number | Date | Country | |
---|---|---|---|
20180273189 A1 | Sep 2018 | US |