Abstract:
A cargo stop for use with a tie down strap with attachment members attachable to anchors in a floor of a cargo compartment usable for carrying cargo. The cargo stop having an elongated cargo engagement wall member portion with a rearward facing elongated engagement wall sized for engagement with cargo to resist forward movement of cargo engaging the engagement wall beyond the engagement wall, an elongated backing member portion rigidly connected to the cargo engagement wall member portion and projecting forward beyond the cargo engagement wall member portion, and an elongated strap receiving recess sized to receive the tie down strap. The length of the engagement wall being sized to position the left end portion of the engagement wall in proximity with a starboard wall of the cargo compartment and the right end portion of the engagement wall in proximity with a port wall of the cargo compartment.

Description:
CROSS-REFERENCE 
       [0001]    This application claims priority from U.S. Provisional Patent Application No. 62/086,343, filed Dec. 2, 2014, the entire contents of which are incorporated herein by reference. 
     
    
     FIELD OF INVENTION 
       [0002]    The present invention relates to a device for controlling movement of cargo in the cargo compartment of commercial jet aircraft. 
       BACKGROUND 
       [0003]    In commercial jet aircraft, such as a Boeing 737, Airbus or others, cargo (including containers and/or other cargo, including baggage) in the cargo compartment (also known as the cargo hold or bay) has a tendency to slide forward and rearward and shift about on the cargo bay floor during flight and other movement of the aircraft. Such forward movement of cargo, especially on landing, is undesirable. 
         [0004]    Cargo nets are typically used in cargo compartments to contain and limit forward movement of cargo. The nets are clipped into cargo net anchors in the cargo compartment floor and elsewhere. With cargo nets, sometimes cargo can move forward sufficiently to hit the cargo net anchor in the cargo compartment floor at a location adjacent to the cargo compartment door and disconnect the cargo net from the cargo net anchor. Cargo can also rip the cargo net and allow cargo, including luggage, to move forward beyond the cargo net. This can result in movement of the cargo into the space needed to permit full inward movement of the cargo compartment access door, which blocks full opening of the door until a cargo handler can gain entrance to the cargo compartment and clear the cargo away from the door. 
         [0005]    Accordingly, it is desirable that a solution be achieved that is inexpensive, easy to install and use, and does not alter the airframe, especially not in a manner requiring FAA certification. A device providing such a solution may allow for the continued usage of cargo nets. The cargo stop block of the present invention satisfies these desirable goals. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0006]    Exemplary embodiments are illustrated in referenced figures. It is intended that the embodiments and figures disclosed herein are considered illustrative rather than restrictive. 
           [0007]      FIG. 1  is a front view of a first embodiment of a cargo stop block according to the present invention installed in the cargo compartment of a commercial jet aircraft. 
           [0008]      FIG. 2  is a front left side perspective view of the cargo stop block of  FIG. 1 . 
           [0009]      FIG. 3  is a rear view of the cargo stop block of  FIG. 1 . 
           [0010]      FIG. 4  is a rear left side perspective view of the cargo stop block of  FIG. 1 . 
           [0011]      FIG. 5  is a front view of a second embodiment of the cargo stop block according to the present invention installed in the cargo compartment of a commercial jet aircraft. 
           [0012]      FIG. 6  is a front left side perspective view of the cargo stop block of  FIG. 5 . 
           [0013]      FIG. 7  is a front left side perspective view of the cargo stop block of  FIG. 5  with a storage compartment in an open state. 
           [0014]      FIG. 8  is a rear view of the cargo stop block of  FIG. 5 . 
           [0015]      FIG. 9  is a comparison of the cargo stop block of  FIG. 5  shown with the storage compartment in a closed state and in an open state. 
           [0016]      FIG. 10  is an instruction sheet for installation of the cargo stop block of  FIG. 5 . 
           [0017]      FIG. 11  is a front view of the cargo stop block of  FIG. 5  installed in the cargo compartment of a commercial jet aircraft. 
           [0018]      FIG. 12  is an enlarged front left side perspective view of the cargo stop block of  FIG. 5  installed in the cargo compartment of a commercial jet aircraft showing an attachment member of a tie down strap holding the cargo stop block in position and being anchored to the cargo compartment floor using a cargo net anchor. 
           [0019]      FIG. 13  is a front left side perspective view of the cargo stop block of  FIG. 5  installed in the cargo compartment of a commercial jet aircraft showing the placement of the cargo stop block relative to a cargo net. 
           [0020]      FIG. 14  is a front view of the cargo stop block of  FIG. 5  showing a left side portion of the cargo stop block. 
           [0021]      FIG. 15  is a front left side perspective view of the cargo stop block of  FIG. 5  installed in the cargo compartment of a commercial jet aircraft showing the cargo stop block retaining baggage against forward movement. 
       
    
    
     DETAILED DESCRIPTION 
       [0022]    A first embodiment of a cargo stop block  10  in accordance with the present invention is shown in  FIGS. 1-4 . The illustrated first embodiment of the cargo stop block  10  includes a cargo engagement wall member portion  12 , a backing member portion  14  and a strap receiving recess  16  for receiving a tie down strap  18 , which preferably is a conventional cargo tie down strap of the design already in use with the aircraft for tying down cargo using the cargo net anchors in the cargo compartment floor and elsewhere.  FIGS. 1- 4  shown the cargo stop block  10  positioned within a cargo compartment  20  and resting on the cargo compartment floor  22 . 
         [0023]    The cargo engagement wall member portion  12  is sized and arranged when in use to extend laterally, transverse to the longitudinal axis of the cargo compartment  20 , extending at least partially between the port interior wall  24  and starboard interior wall  26  of the cargo compartment. The cargo engagement wall member portion  12  does not need to extend fully between the port and starboard interior walls  24  and  26 , but it is desirable to have the end portion of the cargo engagement wall member portion extend laterally beyond and rearward of the cargo net anchor adjacent to the cargo door to protect it from contact or impact by the cargo during flight or other movement of the aircraft and thereby avoid the cargo net connected to that cargo net anchor from being undesirably disconnection of the cargo net anchor or the cargo net anchor from being pulled out of the cargo compartment floor. This is illustrated in  FIGS. 13-15  for the second embodiment of the cargo stop block  10  described below, and shows a cargo net anchor  27  located toward the cargo compartment access door with the end portion of the cargo engagement wall member portion  12  positioned rearward of the cargo net anchor  27  to hold back cargo and protect the cargo net anchor  27 . A cargo net  29  with an attachment member  31  is shown releasably engaged with the cargo net anchor  27  with the cargo net  29  holding back cargo, in particular luggage. In this manner the attachment member  31  is prevented from being disconnection from the cargo net anchor  27  or the cargo net anchor  27  from being pulled out of the cargo compartment floor, which both also prevent the cargo from moving forward sufficiently to block full opening of the compartment access door.  FIGS. 14 and 15  shown a central portion of the cargo net  29  removed and illustrate the cargo engagement wall member portion  12  engaging and holding back luggage. 
         [0024]    The backing member portion  14  is rigidly connected to the cargo engagement wall member portion  12 , such as by thermo forming or any other suitable means. Alternatively, the cargo stop block  10  may be formed as an integral, one-piece unit. 
         [0025]    The strap receiving recess  16  in the illustrated embodiment is a channel extending laterally at a location adjacent to the juncture of the cargo engagement wall member portion  12  and the backing member portion  14 , as best seen in  FIGS. 1 and 2 . The strap receiving recess  16  has spaced apart forward and rearward walls and is wide enough to receive the tie down strap  18  and deep enough that the tie down strap will not come out of the strap receiving recess when the cargo stop block  10  is in use, such as when the forwardly directed force of the cargo is applied to the cargo engagement wall member portion  12  during flight or other movement of the aircraft. Both ends of the tie down strap  18  have a clip  28 , preferably as part of the conventional design cargo tie down strap already in use with the aircraft. The cargo stop block  10  is attached to the cargo compartment floor  22  by placing the tie down strap  18  in the strap receiving recess  16  with the clip  28  at one end to the strap connected to one cargo net anchor  30  and the clip  28  at the other end of the strap connected to another cargo net anchor  32 . 
         [0026]    The tie down strap  18  further includes a ratchet, pull buckle or other mechanism  34  to allow the strap to be shortened and placed under tension to tightly cinch down and hold the cargo stop block  10  to the cargo compartment floor  22  and kept that way during use of the cargo stop block, but yet allowing the tension to be quickly and easily manually released so that the cargo stop block can be quickly and easily removed when no longer needed such as when the cargo is to be removed from the cargo compartment  20 . 
         [0027]    As best seen in  FIG. 3 , the cargo engagement wall member portion  12  has a rearward facing wall  36  which has sufficient height and width to provide a stop wall preventing forward movement of the cargo when it engages the rearward facing wall. Engagement of cargo against the rearward facing wall  36  under a forward force, such as when the cargo is tending to slide forward, can apply a significant force to the upper portion of the rearward facing wall, which would tend to apply a rotational force to the cargo engagement wall member portion  12  about its longitudinal axis. The cargo stop block  10  includes the backing member portion  14  extending sufficiently forward from the cargo engagement wall member portion  12  to resist rotational movement of the cargo engagement wall member portion. This prevents the cargo stop bock  10  from flipping over during use. The strap receiving recess  16  preferably has a lower wall which is lower to the cargo compartment floor  22  than the upper wall of the cargo engagement wall member portion  12  to further reduce the tendency of the cargo stop block  10  to rotate about its longitudinal axis during use when the tie down strap  18  is tensioned to apply a downward force on the cargo stop block. 
         [0028]    A rubber or other material non-slip pad  38  is attached to the underside of the cargo engagement wall member portion  12  and preferably the backing member portion  14  to better grip the cargo compartment floor  22  and resist slipping of the cargo stop block  10  along the cargo compartment floor. Rubber bumpers  40  may be used on forward facing port and starboard end wall portions of the cargo engagement wall member portion  12  at locations which will be adjacent to and butt up against the cargo net anchors  30  when the cargo stop block  10  is in use to provide cushioning between the cargo engagement wall member portion and the cargo net anchors and absorb impacts experienced. 
         [0029]    A second embodiment of a cargo stop block  10  is shown in  FIGS. 5-15 . The illustrated second embodiment of the cargo stop block  10  has the same fundamental construction as the first embodiment, but includes a storage compartment  42  formed in a top side of the backing member portion  14  for storage of a spare tie down strap  18 . A flexible cover  44  is releasable attached along three sides to the backing member portion  14  using Velcro fastening strips to secure the cover to the backing member portion when the cover is closed. 
         [0030]    The cargo stop block  10  may be made from any suitably durable and strong material or combination of materials. Further, the shape of the cargo stop block  10  may be varied from the two embodiments illustrated with still performing the same basic function. 
         [0031]    The foregoing described embodiments depict different components contained within, or connected with, different other components. It is to be understood that such depicted architectures are merely exemplary, and that in fact many other architectures can be implemented which achieve the same functionality. In a conceptual sense, any arrangement of components to achieve the same functionality is effectively “associated” such that the desired functionality is achieved. Hence, any two components herein combined to achieve a particular functionality can be seen as “associated with” each other such that the desired functionality is achieved, irrespective of architectures or intermedia components. Likewise, any two components so associated can also be viewed as being “operably connected”, or “operably coupled”, to each other to achieve the desired functionality. 
         [0032]    While particular embodiments of the present invention have been shown and described, it will be obvious to those skilled in the art that, based upon the teachings herein, changes and modifications may be made without departing from this invention and its broader aspects and, therefore, the appended claims are to encompass within their scope all such changes and modifications as are within the true spirit and scope of this invention. Furthermore, it is to be understood that the invention is solely defined by the appended claims. It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). 
         [0033]    It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers, typically means at least two recitations, or two or more recitations). 
         [0034]    Accordingly, the invention is not limited except as by the appended claims.