Abstract:
Systems for inhibiting installation of emergency escape slides behind bustles (or other covers) when removable safety pins (or similar objects) remain intact are addressed. Versions of the systems mechanically interfere with installation of the bustles as long as the safety pins remain in place. Only when all safety pins are removed can the mechanical impediment be detached (or moved sufficiently) to permit installation of the bustles.

Description:
REFERENCE TO PROVISIONAL APPLICATION 
       [0001]    This application is based on and hereby refers to U.S. Provisional Patent Application Ser. No. 60/995,563, filed Sep. 27, 2007, and having the same title as appears above, the entire contents of which provisional patent application are incorporated herein by this reference. 
     
    
     FIELD OF THE INVENTION 
       [0002]    This invention relates to mechanisms for inhibiting improper placement of equipment within enclosures and more specifically, although not necessarily exclusively, to mechanical means for interfering with bustle placement over undeployed (packed) escape slides until certain safety pins have been removed from the slides. 
       BACKGROUND OF THE INVENTION 
       [0003]    Commercial fixed-wing aircraft, among other types of transport vessels, frequently include one or more doors for ingress and egress of passengers and crew. Because of the substantial size of many of these aircraft, the doors are well above the ground or other surface supporting the aircraft. In an emergency situation when mobile stairs or pedestrian bridges are unavailable to facilitate passengers exiting an aircraft, inflatable escape slides may be deployed to span distances between the aircraft doors and the supporting surfaces. 
         [0004]    U.S. Pat. No. 4,567,977 to Fisher, whose contents are incorporated herein in their entirety by this reference, illustrates one such inflatable slide. As noted in the Fisher patent, the slides commonly are stored in deflated condition adjacent exit doors of aircraft. Other than, perhaps, during conduct of certain maintenance, the slides are not intended to be inflated unless needed to assist passengers in evacuating the aircraft. By contrast, should the slides be needed for this purpose, they are designed to inflate and deploy rapidly to minimize evacuation delay. 
         [0005]    U.S. Pat. No. 4,125,235 to Fitzgerald, et al., whose contents also are incorporated herein in their entirety by reference, depicts an escape slide packed within or adjacent a door. A bustle usually covers the packed slide during normal operation of the aircraft. This covering is advantageous for multiple reasons, including that it protects the slide (and particularly its inflatable components) from punctures or wear caused by contact with, for example, passengers, luggage, food and trash carts, etc. Covering the slide also inhibits accidental or premature deployment. Finally, the bustle may perform aesthetic functions as part of the cabin of the aircraft. 
         [0006]    At all times prior to installation in an aircraft, a slide also is susceptible to damage, unpacking, and (possibly) undesired deployment. Accordingly, slides typically include one or more safety pins or similar devices designed to prevent or reduce likelihood of these types of unintended occurrences pre-installation. Importantly, though, these safety pins must be removed as part of the installation process. Otherwise, a slide may be installed and covered by a bustle in a non-functional state. Indeed, such installation in a non-functional state has occurred previously aboard commercial aircraft and been documented by the U.S. Federal Aviation Administration (FAA). 
       SUMMARY OF THE INVENTION 
       [0007]    The present invention is designed to inhibit, if not prevent, installation of emergency escape slides behind bustles when safety pins have not been removed. Presently preferred versions of the invention mechanically interfere with installation of the bustles as long as the safety pins remain in place. Only when all safety pins are removed can the mechanical impediment be detached (or moved sufficiently) to permit installation of the bustles. 
         [0008]    In certain versions of the invention, a rigid post provides the mechanical interference. The post is threaded and screwed into a mating flange permanently attached to a packed slide. The post extends outward from the packed slide a distance greater than the spacing between the slide and its corresponding bustle. Hence, should an attempt be made to install a bustle while the post is intact, the (rigid) post will impact the bustle and inhibit further installation. 
         [0009]    Lanyards, ribbons, or similar elongated objects may connect the post to the safety pins present in the slide. Such elongated objects preferably have significant strength so as to resist cutting or tearing. Beneficially, the elongated objects will be tensioned when the post is mated with the flange. 
         [0010]    Any attempt to unscrew the post from the flange will cause the elongated objects to wind around the post as the post is rotated. If unscrewing is attempted while the safety pins are in place, the tension and strength of the elongated objects will prevent any significant rotation of the post. (Alternatively, unscrewing the post conceivably could cause forcible removal of the safety pins, although this result is not preferred.) By contrast, if the safety pins are correctly removed from the packed slide, the post may be completely unscrewed from the flange, with the (now slack) lanyards generally winding around the post as it rotates. After the post is completely removed from the flange, the bustle may be installed over the packed slide without interference. 
         [0011]    Many current commercial escape slides include two safety pins when initially packed, one typically connected to the inflation valve and the other attached to the pack release mechanism. For these slides, a separate lanyard or similar object may be utilized to connect each safety pin to the post. Therefore, even if one pin is removed (so that its corresponding lanyard is slack), tension in the lanyard connecting the second pin to the post will remain and prevent the post from being unscrewed from the flange. 
         [0012]    It thus is an optional, non-exclusive object of the present invention to provide systems for interfering with installation of devices until certain safety mechanisms are removed. 
         [0013]    It is also an optional, non-exclusive object of the present invention to provide systems for mechanically interfering with premature installation of devices. 
         [0014]    It is another optional, non-exclusive object of the present invention to provide systems for preventing, or at least inhibiting, installation of bustles or other covers over packed escape slides until safety pins are removed. 
         [0015]    It is a further optional, non-exclusive object of the present invention to provide systems utilizing a protruding rigid component to function as the installation inhibitor. 
         [0016]    It is, moreover, an optional, non-exclusive object of the present invention to provide systems in which lanyard, ribbons, or other elongated objects connect the protruding rigid component to safety pins of a packed escape slide. 
         [0017]    It is yet another optional, non-exclusive object of the present invention to provide systems in which attempted premature removal of the protruding rigid component tensions at least one of the elongated objects. 
         [0018]    Other objects, features, and advantages of the present invention will be apparent to those having skill in the appropriate fields with reference to the remaining text and the drawings of this application. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0019]      FIG. 1  illustrates portions of a packed escape slide with a bustle interference system in place. 
           [0020]      FIG. 2  illustrates the system of  FIG. 1 . 
           [0021]      FIG. 3  shows the rigid post of the system of  FIG. 1 . 
           [0022]      FIG. 4  depicts a first elongated object of the system of  FIG. 1  designed to connect the rigid post to a first safety pin. 
           [0023]      FIG. 5  depicts a second elongated object of the system of  FIG. 1  designed to connect the rigid post to a second safety pin. 
       
    
    
     DETAILED DESCRIPTION 
       [0024]    Illustrated in  FIGS. 1-2  are portions of system  10  of the present invention. Also detailed in these figures is slide assembly  14 , which may comprise a conventional escape slide and associated equipment typically used for commercial aircraft. Slide assembly  14  need not necessarily be conventional; instead, in some cases it may constitute any such assembly useful for providing low-friction, gravitationally-based transport of persons, animals, or cargo from one place to another. Likewise, slide assembly  14  need not necessarily be intended for use in commercial aircraft, as passenger evacuation requirements may exist for ships, buildings, or other fixed or mobile structures as well. 
         [0025]    As depicted in  FIGS. 1-2 , slide assembly  14  is packed into a small volume for transport or installation prior to deployment and use. Packing in this manner is especially important when assembly  14  is to be used on-board commercial aircraft, in which space available for such equipment often is modest. So packing assembly  14  also helps protect its fragile components prior to deployment. Further, as noted above, as packed assembly  14  may be covered by a bustle or similar cover for protective and decorative purposes. 
         [0026]    Because deployment of slide assembly  14  prior to its on-board installation is undesirable (and potentially hazardous), assembly  14  conventionally incorporates fail-safe mechanisms designed to render it inoperable when the mechanisms are employed. Consistent with many existing assemblies, slide assembly  14  includes one or more safety pins  18 . Presently preferred versions of assembly  14  include two such pins  18 , one disabling the inflation valve and the other disabling the pack release mechanism of the assembly  14 .  FIG. 4  illustrates one such pin  18 A for attachment to the inflation valve, whereas  FIG. 5  illustrates the other pin  18 B connected to the pack release mechanism. Those skilled in the art will, of course, recognize that other fail-safe mechanisms may be used instead of or in addition to pins  18  and that pins  18 , if utilized, may connect to other portions of assembly  14  than as shown in  FIGS. 1-2 . 
         [0027]    Also depicted in  FIGS. 1-2  is element  22  of system  10 . Element  22  advantageously is rigid (or at least relatively inflexible) and configured to protrude outward from slide assembly  14 . As a consequence, when element  22  is attached to slide assembly  14 , it interferes with attempted placement of a cover flush with surface  26  of assembly  14 . 
         [0028]    Preferred versions of element  22  comprise elongated, rigid posts made of metal or other strong material. Beyond being relatively inflexible, such posts preferably are lightweight so as not to increase the overall weight of system  10  and assembly  14  unduly. Although  FIGS. 1-2  show rounded covering  30  at distal end  34  of element  22 , such covering  30  is optional and may be omitted if desired. Similarly, element  22  need not necessarily be shaped as an elongated post. 
         [0029]    Also illustrated as part of system  10  is mating flange  38  permanently attached to slide assembly  14 . Both flange  38  and element  22  beneficially may be threaded, so that element  22  screws into (and out of) flange  38 . Other fastening mechanism could, however, be employed. Likewise, flange  38  and element  22  need not be located in the positions shown in the figures; instead, they may be positioned in any manner suitable to interfere with attempted covering of assembly  14 . 
         [0030]    System  10  further may include ring  42  and one or more lanyards  46 , ribbons, or other elongated objects. Ring  42  is connected to or formed together with element  22 . Lanyards  46 , by contrast, are intended to be securely received by ring  42  so as to connect pins  18  to element  22 .  FIG. 4  details a lanyard  46 A designed to connect pin  18 A to element  22 , while  FIG. 5  illustrates a second lanyard  46 B configured to connect pin  18 B to element  22 . 
         [0031]    Shown especially in  FIGS. 1-2 , lanyards  46  preferably are taut (tensioned) when in use and constructed of material unlikely to tear or break. Hence, for example, if pin  18 A is not removed, the taut lanyard  46 A will resist any attempt to rotate element  22  out of flange  38 . Likewise, if pin  18 B is not removed, tensioned lanyard  46 B will resist rotation of element  22 . Moreover, even if some slack initially exists in lanyards  46 , initial rotation of element  22  will cause the lanyards  46  to wind around the element  22 , taking up the slack and preventing further rotation. Only if both pins  18 A-B are removed will lanyards  46 A-B become slack and cease resisting rotation of element  22 . 
         [0032]    Because element  22  may not be rotated out of flange  38  while any pin  18  remains in place, no bustle or other cover may be placed proximate surface  26  of slide assembly  14 . If, on the other hand, all pins  18  are removed, element  22  may be removed completely from flange  38  and stored so that it no longer protrudes outward from surface  26 . In this latter circumstance, a bustle or other cover may then be positioned flush with surface  26  without interference. 
         [0033]    The foregoing is provided for purposes of illustrating, explaining, and describing embodiments of the present invention. Modifications and adaptations to these embodiments will be apparent to those skilled in the art and may be made without departing from the scope or spirit of the invention.