MOVABLE SEATING SYSTEM FOR AIRCRAFT

Abstract: An adjustable seating system (10) particularly adapted for use in a passenger aircraft, where there are a pair of tracks (18) mounted in the floor of the aircraft, and a plurality of seating units (12) mounted to these tracks. Each seating unit has a pair of interconnected traction wheels (66) which have positive engagement with the tracks (18), so as to avoid skewing of the seating units as these are moved along the tracks. Pivotally mounted locking members (94) lock the rear leg portions (52) of the seating units to the tracks at selected locations. Telescoping track cover members (124, 128) cover the track sections that extend between adjacent seating units.

Description: BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to an adjustable seating system adapted for use in a passenger vehicle, such as a passenger aircraft, as described in the preamble of claim 1. Such a seating system, where the seat rows can be conveniently moved forwardly or rearwardly to selected locations in the aircraft to adjust the pitch (i.e. spacing) of the seats and in some instance to make additional space for cargo or the like, is known from EP-A-0021933. Background Art In many modern day commercial passenger aircraft, two or more seats are connected to an undercarriage to make a seat row, and the undercarriage is in turn securely mounted to two underlying longitudinally extending tracks. Normally, the seat undercarriages are mounted to these tracks in a manner that it is a very time consuming operation to unlock the undercarriages from the tracks and move the seats to a different location. Yet, there are many instances where it would be desirable to adjust the location of the seat rows. For example, it may be desirable to adjust the seat rows locations for use on certain flights to bring the rows closer together to accommodate more passengers. For other flights where lower density passenger loading is more desirable, the seat rows would be moved back to locations with greater spaces between them. In some instances, it may be desirable to move the seat rows very close together so that room could be made for cargo. One type of track which is commonly used for mounting seats in passenger aircraft is one where the track has a lengthwise dovetail-shaped passageway, where there are two laterally and inwardly extending flanges or lips that form the upper part of the passageway. At regularly spaced intervals along the length of the track, the two lips or flanges are formed with circularly curved cutouts so that these circular cutouts collectively form vertical circular openings interconnected by narrower elongate rectangular openings. The seat mounting devices are arranged so that circular foot members at the lower end of the undercarriage are inserted downwardly through the circular openings, and the mounting device is then moved forwardly or rearwardly approximately one-half of the distance of the spacing of the circular openings. This places the foot members beneath related inwardly extending lips of the track member, so that the foot members cannot be moved upwardly while in that location. Then a vertical plunger or shear pin is inserted into an adjacent vertical circular opening to prevent the fitting from being moved forwardly or rearwardly. In one type of such seat mounting and connecting device, there is an "anti-rattle" mechanism which is a threaded member which is mounted on a pivotally mounted member. By moving the threaded member inwardly, the pivotally mounted member is urged in a direction to press the foot member upwardly against the inwardly extending lips of the seat track. With this prior art seat fastening and mounting system, to move the seat rows to a new location, it is necessary for a workman to assume a position very close to the floor level. The workman unscrews the anti-rattle mechanism of each seat mounting, and then moves the plunger or shear pin to the non-engaged position. After the mounting devices for a particular row of seats are so placed in the unlocked position, the seat row can be moved forwardly or rearwardly a short distance so that the feet members register with adjacent vertically aligned openings in the tracks. Then the seat row can be lifted free of the track and moved to another location, placed into the desired locking position and secured to the tracks. In general, the rearranging of the seat rows in a modern day passenger airliner can be an overnight operation. The European patent application EP-A-0021933 describes an adjustable seating system which is amed at reducing the burden of adjusting the spacing of the seating units. This is accomplished by providing a fixed seating unit with a power unit, interconnecting the movable seating units in front of and/or behind this fixed powered seating unit, and connecting the interconnected movable seating units to the fixed powered seating unit. The members connecting the seating units are slidably attached to the seating tracks, and engage the seating units in such a way that when driven by the power unit they will first automatically unlock the movable seating units from the seating track, and then move them over a distance determined by the shape and size of the connecting members. The adjustable seating system described above has a number of disadvantages. The relatively great distances covered by the connecting members that push or pull the movable seating units to and from the fixed powered seating unit, and the loose play that necessarily exists between the retaining feed of the movable seating units and the seating tracks in which they move make accurate guidance of the movable seating units and the seating tracks in which they move make accurate guidance of the movable seating units during movement to and from the fixed powered seating unit difficult to achieve, so that the system can easily become jammed. Furthermore, although the system provides for automatic unlocking of the movable seating units, after moving these seating units they have to be locked in their new positions by turning a screw which is situated near the floor level, making this a tedious and time-consuming operation. Another disadvantage of the system described in EP-A0021933 is that the movable seating units can never be moved individually, and never over any distance other than that which is determined by the length of certain cut-aways provided in the connecting members, which greatly reduces the flexibility of the adjustable seating system. Summary of the invention In view of the foregoing, it is an object of the present invention to provide a convenient and reliable seating system for a passenger aircraft or the like, where the seats can be quickly and effectively moved to different locations to provide different seating arrangement and/or additional space for cargo or other purposes. According to the invention, this is achieved in an adjustable seating system as described in claim 1, in that said traction assembly comprises at least two traction wheels, each of which engages a related one of said two tracks, each traction wheel having a peripheral portion with a plurality of producing positioned and spaced relative to one another so as to match positioning and spacing of the enlarged openings of its related track, the traction wheels of each traction wheel assembly being operatively interconnected in a manner that rotation of a first one of said traction wheels causes a corresponding rotation of a second one of the traction wheels so that with the two traction wheels engaging their related tracks, rates of travel of the two wheels over their related tracks are equal. Thus, an adjustable seating system is provided which can quickly and securely be guided along the seating tracks in order to change the spacing of the seating units, without the risk of a skewing movement of the seating units and a subsequent jamming of the adjustable seating system. In a preferred embodiment, each said locking member is pivotally mounted to its related retaining food member for pivoting movement between said locking position and said release position, and each of said unlocking actuating means also acts as a locking actuating means, and comprises a manually operated lever means positioned adjacent its related seating unit, resulting in a seating system in which each seating unit can easily and individually be locked and unlocked by simply moving a conveniently located lever. In another preferred embodiment, each said unlocking actuating means also acts as a locking actuating means, and comprises a lever member operatively connected to said locking member at a location adjacent its related track, said lever member being configured and arranged so that in its locking position, the lever member fits over and covers a section of said track adjacent to its related mounting and locking assembly. Thus, a seating system is created in which each seating unit can easily and individually be locked and unlocked by simply lifting or lowering a track cover member. Preferable, the adjustable seating system also comprises roller means positioned adjacent each mounting and locking assembly, each of said roller means being positioned relative to its related mounting and locking assembly in a manner that movement of said locking member to its release position brings said roller means into bearing engagement with its related track to facilitate movement of its related seating unit. In the adjustable seating system, each said locking member may be arranged so that movement of the locking member to the locking position causes the locking member to have an operative lifting engagement between its related track and the related food member to press said retaining food member upwardly against the retaining flange portions to prevent rattling motion of said mounting and locking assembly. The above and other features of the adjustable seating system according to the present invention will now be described in further detail. Brief Description of the Drawing Figure 1 is an isometric view illustrating a first embodiment of the seating system of the present invention; Figure 2 is an isometric view of one of the rear leg mounting portions of the system of Figure 1, with portions thereof being broken away for clarity of illustration; Figure 3 is an isometric view of the forward mounting portion of one seat row, and also showing one of the two traction wheels provided for each of the seat rows; Figure 4 is an isometric view of a single undercarriage of one seat row, with portions thereof being broken away for clarity of illustration; Figure 5 is a side elevational view of the undercarriage of Figure 4, with portions thereof being removed for clarity of illustration; Figure 6 is a view similar to Figure 5, illustrating the rear mounting and locking assembly of the undercarriage of Figure 5, with the locking member being in its secured position; Figure 7 is a view similar to Figure 6, but showing the locking member in its released position; Figure 8 is a sectional view taken along line 8-8 of Figure 5, and showing a front mounting foot of the present invention; Figure 9 is a view taken along line 9-9 of Figure 5, and showing one of the two traction wheels used for one seat row; Figure 10 is a view taken at the location of line 10-10 of Figure 6, showing the rear locking member in its secure or locked position; Figure 11 is a view taken at the location of line 11-11 of Figure 7, and showing the rear locking member in its unlocked or released position; Figure 12 is a view similar to Figure 5, looking at an undercarriage in side elevational view, and showing a second embodiment of the present invention, with the rear locking member in its locked position; Figure 13 is a view similar to Figure 12, showing the rear locking member of the second embodiment in its release position; Figure 14 is a cross-sectional view along a line transverse to a lengthwise axis and illustrating a modified version of the telescoping track cover of the present invention; and Figure 15 is a side elevational view showing a further embodiment where the track cover member functions as a lever to move the locking member into and out of locking engagement. Detailed Description of the Preferred Embodiments With reference to Figure 1, the seating system of the present invention, generally designated 10, comprises a number of seat rows 12, each of which, in this particular embodiment, is made up of three seats 14. The three seats 14 of each row are mounted on a seat frame or undercarriage 16, which in turn is movable mounted to a pair of longitudinally extending tracks 18. The undercarriage 16 comprises a main frame 20 to which the seats 14 are directly mounted, a pair of forward mounting members 22, a pair of rear mounting and locking assemblies 24, and a traction wheel assembly 26. With reference to Figure 3, each track 18 has a main structural portion in the form of an I-beam 28, comprising a lower flange 30, a vertical web 32, and an upper flange 34. Extending upwardly from the upper flange 34 are two "inverted L-shaped" members 36, each of which has a laterally and inwardly extending lip or flange 38, with the two flanges of each track being spaced a moderate distance from one another. The two flanges 38 are provided with matching circular recesses 40 which collectively form a plurality of vertically aligned and longitudinally spaced vertical through circular openings 40-40. Thus, each pair of adjacent openings 40-40 is connected by a related rectangular connecting opening 42. Track members 18 such as described above (and comprising components 28-42) have existed in the prior art for a number of years, and are present in many modern day passenger aircraft. As discussed previously herein, the common prior art method of mounting the seat rows 12 to these tracks 18 is a very time consuming and labor intensive operation. As will be disclosed in more detail later herein, the present invention is particularly adapted to be used in conjunction with the prior art track members 18. The undercarriage 16 has an upper rectangular frame portion, made up of forward and rear, laterally extending, tubular frame members 46 and 48, respectively, and a plurality of longitudinally aligned cross members 50. There are two downwardly and rearwardly extending rear legs 52, and two substantially vertically aligned forward legs 54, with the lower ends of the legs 52 and 54 terminating above respective tracks 18. A pair of fairing members 56 and 58 connect to and extend between each forward leg 54 and its related rear leg 52 at the lower ends thereof. The elements of the undercarriage can be made as separate elements joined to one another or as a single integral member. With reference to Figures 3 and 8, it can be seen that each forward mounting member 22 comprises a circular horizontally extending foot 60 that is connected to a vertical plate or post 62 that is in turn connected to the lower end of the front leg 54. This foot 60 is sized so that it can pass through one of the circular openings 40-40, but is sufficiently wide so that when it is under a pair of inwardly protruding lips 38, it remains secured in the track passageway or slideway 64 defined by the upper flange 34 and the two inverted L-shaped members 36. With reference to Figures 3, 5 and 9, the traction wheel assembly 26 comprises a pair of traction wheels 66 each of which has its periphery formed with a plurality of evenly spaced, outwardly protruding circular lugs 68, and each of which travels over a related track 18. These lugs 68 each have a circular configuration matching that of the circular track openings 40-40, and the spacing of the lugs 68 matches the spacing of the circular openings 40-40. Thus, each wheel 66 moves along its related track 18 with the lugs 68 fitting in the openings 40-40 in sequence for positive engagement. Each traction wheel assembly 26 comprises two traction wheels 66, with each pair of wheels 66 being rigidly interconnected by a laterally extending cylindrical shaft 70 located beneath forward parts of the seats 14 a short distance above the aircraft door. The end of the shaft 70 which is adjacent an aisle of the aircraft is provided with an interior plug 72 which is fixed to the shaft and has a transverse slot 74 which is adapted to receive a flat drive member in driving engagement. As illustrated in Figure 1, there is a drive unit 76 mounted to a set of four wheels 78 which are driven by a motor 80 which can be battery powered. The drive unit 76 has a rotatable drive member 82 which can be inserted into the shaft slot 74 in driving engagement. The inside fairing member 56 (the one adjacent the aisle) is provided with a through opening 84 to provided access to the drive slot 74 of the shaft 70. Thus, the drive unit 76 is able to cause rotation of the two traction wheels 66 to move the related seat row 12 forwardly or rearwardly. Alternatively, each seat row 12 can be manually pushed forwardly or rearwardly. In either case (whether manually powered or powered by the unit 76), the fact that the two traction wheels 66 are rigidly interconnected by the shaft 70 insures that the wheels 66 of each traction wheel assembly 26 will rotate at the same rotational speed. This insures that the movement of each seat row 12 will proceed evenly, without any skewing of the seat row 12. As another option, the drive members could be mounted directly to the undercarriage 16, so that each seat row could have its own built-in power unit. These power units could be controlled from a single control location, and the control system could be computerized to cause movement of the seat rows in accordance with programmed patterns. To describe the two rear mounting and locking assemblies 24 that are provided for each seat row 12, reference is now made to Figures 2, 6, 7, 10 and 11. The lower end of each of the two rear legs 52 is fixedly connected to a lower end mounting structure 86 which in turn is pivotally connected at 88 to a retaining foot member 90. As its name implies, this foot member 90 has forward and rear retaining feet 92, each of which has generally the same configuration as the previously described front foot 60. Thus, each of these retaining feet 92 has a generally circular configuration so that it can move vertically through each of the circular track openings 40-40. However, when the retaining foot member 90 is positioned so that the two feet 92 are located immediately below respective rectangular connecting openings 42, the two retaining feet 92 are held to the related track 18 by the track lip or flange portions 38 positioned immediately above. The main body portion of the foot retaining member 90 has a width moderately smaller than the width of the rectangular connecting openings 42. This permits each seat row 12 to be moved forwardly and rearwardly while the feet 92 remain in the passageways 64 of the two tracks 18. Each rear mounting and locking assembly 24 further comprises a locking member 94 made up of two elbow-shaped plate members 96 which are pivotally connected at their forward end at 98 to the related retaining foot member 90. The upper rear end of the two plate members 96 are pivotally connected at 100 to the lower end of an actuating rod 102 positioned in a related rear leg 52. The upper end of this rod 102 is pivotally connected at 104 to a related actuating arm 106. The two actuating arms 106 of the two rear mounting and locking assemblies 24 are both fixedly connected to a shaft 108 that is positioned within the rear tubular frame member 48 for limited rotation therein. The inside end of the shaft 108 (i.e. that end of the shaft closer to the aisle of the airplane) is in turn connected to an elongate locking and unlocking handle 110. As indicated previously, the two plate members 96 that make up the locking member 94 each have an elbow-like configuration. Thus, there is a lower forwardly extending portion 112 and a rear upwardly extending portion 114. At the lower edge of each of the lower portions 112, there is a laterally extending arcuate plug or locking portion 116 that matches the contour of the circular openings 40 of the track 18. The rear mounting and locking assembly 24 has a locked position where the locking member 94 is rotated downwardly to the position shown in Figures 2, 6 and 10. In this position, the two plug or locking portions 116 fit within a related circular opening 40 in the track 18. Further, in the locked position, the locking and unlocking handle 110 is positioned horizontally against the lower side of one of the horizontal seat portions of one of the three seats 14. In this seat locking position, the handle itself can be locked in place by, for example, a key operated lock which could only be unlocked by one of the attendants in the airplane. This would prevent the accidental unlocking of the seat row 12. Another significant feature of the present invention is that the locking member 94 is so arranged that when it is in its locked position, the retaining foot member 90 is urged upwardly so that the two retaining feet 92 press upwardly against the track lip or flange portions 38 that are positioned immediately above. (This can best be seen with reference to Figures 10-11. In the locked position of Figure 10, it can be seen that the foot 92 is engaging the lip 38--the other lip 38 not being shown for ease of illustration. In the unlocked position of Figure 11, the foot 92 is positioned in the track slot or slideway 64 so as to be substantially out of engagement with the adjacent surfaces of the track 18.) This engagement of the feet 92 with the lips 38 is accomplished by reason of the lower surface portions 118 of the plate member 96 being formed as cam surfaces that are pressed against the upper surface of the lips or flanges 38 of the track 18. These surface portions 118 function in the manner of a fulcrum so that the downward and rearward force exerted by the actuating rods 102 at the pivot location 100 causes the forward pivotal connection 98 of the two plate members 96 of the locking member 94 to be urged upwardly to lift the retaining foot member 90 a short distance upwardly. This engagement of the foot members with the lips 38 prevents any "rattling" in the rear mounting and locking assembly 24. Thus, it can be appreciated that the "anti-rattle" feature of the present invention is accomplished simply by moving the locking and unlocking handle 110 upwardly into its locked position, with the locking motion simultaneously causing the retaining feet 92 to be moved into their snug engaged position against the adjacent lips 38 and also to insure proper placement of the locking portions 116. Each actuating rod 102 has a threaded adjustment device 120 by which the length of that rod 102 can be changed in very small increments. This is to insure that there is the proper engagement of the lower surface bearing portion 118 so that there is snug engagement of the retaining feet 92 against the lips or flanges 38. Each rear mounting and locking assembly 24 further comprises a track engaging rear wheel 122 which rides on the upper side surface portions of the track 18. This wheel 122 is rotatably mounted in recesses formed in the two bearing sections 56 and 58. Further, each wheel 122 is so positioned that when the locking member 94 is in its locking position so as to slightly raise the foot member 90, the wheel 122 is just out of engagement with the related track 18. However, when the locking member 94 is swung upwardly to its unlocked position, the rear portion of the undercarriage 16 drops just slightly so that the two rear wheels 122 of the two rear mounting and locking assemblies 24 come into load bearing engagement with the two tracks 18. As illustrated in Figure 11, when the wheels 122 are in engagement with the two tracks 18, the rear retaining feet 92 are positioned in a central unengaged location in the track 18. Each of the seat rows 12 that has an adjacent forward seat row 12 is connected to that forward seat row 12 by means of a track cover/pitch control assembly 124. Each such assembly 124 comprises a pair of telescoping members, namely a forward member 126 and a rear member 128. The forward member 126 is connected at its forward end 130 to the related retaining foot member 90 of the forward seat row 12. The rear member 168 is connected to the rear seat row 14. (The precise connection of the rear member 128 to the seat row 12 is not specifically illustrated, but this can be a conventional connection, such as with threaded fasteners.) The precise cross-sectional configuration of the two telescoping members 126 and 128 can vary. As shown in Figure 2, the forward member 126 comprises a generally flat plate-like cover portion 132 having outer edged portions 134 that overlie an adjacent portion of the carpet 136. Also, the forward member 126 has a downwardly extending flange or web 138 that fits within the openings 42 of the related track 18. The rear member 128 also has a flat cover portion 140 that overlies the cover portion 132 of the member 126. Further, the edges 141 of the cover portion 140 extend downwardly and around the outer edge portions 134 of the forward member 126 so that the two members 126-128 are secured to one another in telescoping engagement. The forward member 126 has an upstanding stop member 142 that is adapted to engage a forward stop member 144 that extends a short distance downwardly from the lower surface of the cover portion 140 of the rear member 128. Further, the stop member 142 is arranged to engage a rear stop member 146 that is spaced rearwardly of the forward stop member 144 and also extends downwardly from the cover portion 140 of the rear member 128. These two stop members 144-146 are spaced from one another a distance which permits the two telescoping members 126-128 to move relative to one another to locations corresponding to the minimum pitch (i.e. spacing) and maximum pitch of the adjacent seat rows 12. As can be seen in Figure 2, the upper surface of the cover portion 132 of the forward telescoping member 126 is provided with a number of spaced markings 148, with the distance between the markings 148 being equal to the distance between adjacent circular track openings 40. These markings 148 are so spaced and positioned, that when one of the seat rows 12 is at a location where the locking member 94 of the two mounting and locking assemblies 24 is moved into its locking position, the other seat row 12 can easily be moved into a position where it can be locked in place, by aligning the front edge 150 of each of the rear telescoping members 128 with one of the markings 148. To describe the operation of the present invention, let it be assumed that the various seat rows 12 are securely mounted to the tracks 18 in their locked or secured positions, with each of the locking and unlocking handles 110 in the up locking position. In this situation, the locking members 94 of the two mounting and locking assemblies 24 of each of the seat rows 12 has been rotated downwardly into its locking position. In that position, the two lugs or locking members 116 engage a related pair of circular track openings 40-40 to prevent any forward or rearward movement of the seat row 12 relative to the track 18. In addition, the locking member 94 of each of the assemblies 24 holds its related retaining foot member 90 in an upwardly pressed position so that the feet 92 are pressed upwardly against related lips 38 of the track 18. This arrangement prevents any "rattling" of the rear mounting and locking assembly 24. Let it now be assumed that the aircraft in which the seat rows 12 are mounted has reached a destination and has unloaded. Let it be further assumed that it is desired to change the spacing of the seat rows 12 by moving these seat rows 12 more closely together. This is accomplished in the following manner. First, each of the handles 110 of the seat rows 12 which are to be moved is rotated downwardly to the release position. (If each of the handles 110 is held in place by a key operated lock, the airplane attendant simply unlocks each of the handles 110.) When the handle 110 is rotated downwardly to its unlocked position, this in turn pulls the two actuating rods 102 that are operated by that handle 110 upwardly and forwardly so as to lift each of the related locking members 94 upwardly to the release or unlocked position. In that position, the plugs or locking members 116 are moved out of engagement with the openings 40 of the two tracks 18. At the same time, the movement of the locking members 94 permits the rear portion of the undercarriage 16 to drop slightly so that the two rear wheels 122 come into load bearing engagement with the two tracks 18. With this being accomplished, each seat row 12 is supported by the two forward traction wheels 66 and the two rear wheels 122. This permits each of the seat rows 12 that are unlocked to be rolled forwardly or rearwardly along the tracks 18. If the power unit 76 is to be used to move the seat rows, then the drive member 82 is inserted into the slot 74, and the unit 76 is operated to rotate the two traction wheels 66 either clockwise or counterclockwise. Since the lugs 68 of the traction wheels 66 are in positive engagement with the circular openings 40-40 of the two tracks 18, and since the two traction wheels 66 of each seat row 12 are fixedly interconnected by the shaft 70, the rates of travel of the two sides of the seat row 12 relative to each of the tracks 18 are equal (i.e. there is no skewing of the alignment of the seat row 12). Since the track cover/pitch control assemblies 124 are capable of only limited telescoping movement, when interconnecting assemblies 124 reach their end limit of travel, they will automatically cause the next adjacent seat row 12 to be moved along with the seat row 12 that is being moved. Thus, in the event that the seats are being moved more closely together for more dense passenger loading, it would be necessary only to move the seat at the extreme forward or rear end in the appropriate direction, so that this would cause other seat rows 12 to move also as the respective telescoping assemblies 124 reach their end limits of travel. When one of the seat rows 12 has reached a desired location, then that particular seat row 12 is locked in place by properly aligning the seat row 12 relative to the openings 40-40 in the tracks 18. Then the handle 110 of that seat row 12 is lifted upwardly to cause the related locking members 94 to rotate downwardly to cause the plugs 116 to move into locking engagement with the related openings 40-40. Then each additional seat row 12 can be moved into the precise position for locking to the tracks 18 by aligning the front edge 150 of the rear telescoping member 128 with the appropriate marking 148. Since the two traction wheels 66 of each seat row 12 insure that the seat row 12 is properly aligned relative to the tracks 18 at all times, both of the rear mounting and locking assemblies 24 will automatically be properly located relative to the tracks 18 when one of the assemblies 24 is properly located. When the seat rows 12 have all been placed in the proper positions, and all of the handles 110 have been moved into the upper locking position, these handles 110 are in a convenient out of the way location. Further, the sections of the tracks 18 that are positioned between adjacent seat rows 12 are automatically covered by the telescoping cover members 126 and 128 of the track cover/pitch control assemblies 124. Further, the location of each shaft 70 is such that it acts as a luggage bar to locate any luggage that is placed under the seat. Reference is now made to Figures 12-13 which show a second embodiment of the present invention. In this second embodiment, components which are similar to components of the first embodiment will be given like numerical designations with an "a" suffix distinguishing those of the second embodiment. Thus, there is illustrated an undercarriage 16a of a seat row 12a having a pair of front legs 54a and a pair of rear legs 52a. There are two forward traction wheels 66a, each engaging a related track 18a. The main difference in this second embodiment is the particular arrangement of the two rear mounting and locking assemblies 24a. Each assembly 24a has a related retaining foot member 90a that is connected at 88a to its related rear leg 52a. In addition, each member 90a has a flange or plate 152 located at an upper rear portion of its related retaining member 90a. The locking member 94a has a forward pivot connection at 100a to the actuating rod 102a, and the retaining member 94a is pivotally connected at 98a to its related retaining member 90a at 98a which is rearward of the pivot connection 100a. The locking plugs 116a of each locking member 94a are at the forward portion of the locking member 94a. When the handle 110a is rotated downwardly and rearwardly to the position of Figure 12, this causes the rod 102a to push the pivot location 100a downwardly, and cause a rear upwardly facing surface 154 of the locking member 94a to move upwardly to come into engagement with the flange 152 of the retaining member 90a. This engagement of the surface 154 with the flange 152 causes a slight upward movement of the retaining member 90a so that its related feet 92a are pushed upwrdly against the upper lip portions of the track 18a. In addition, the contour of the lower surface of the member 94a acts as a lifting cam to raise the member 90a. Thus, the "anti-rattling" is accomplished by moving the lever 110a down to its locking position, which in addition to causing proper locking engagement of the lugs 116a also causes the proper anti-rattling engagement of the surface 154 with the flange 152. With regard to the detailed configuration of the rear mounting and locking assembly 24a, the detailed construction can be in general similar to that of the assembly 24 of the first embodiment. Thus, it would be practical to form the locking member 94a as two side plates fitting on opposite sides of the retaining member 90a. With reference to Figure 14, there is shown a somewhat modified version of the track cover/pitch control assembly 124, and this is designated in Figure 14 as 124a. In this arrangement, the rear telescoping member 128a, in addition to having the upper cover portion 140a, also has a lower portion 156 which fits into the passageway 64a of the track 18a. Also, the outer portions 158 of the telescoping member 128a extend over the carpet 136a. As shown herein, the carpet 136a lies on the top surface of the floor structure 160. The forward member 126a has in general the same overall structure as that of the member 126 of the first embodiment. It is to be understood that this assembly 124a of Figure 14 is provided with the appropriate stop members to limit the telescoping travel of the two members 126a and 128a. Further, the member 126a can be provided with the appropriate markings so that the telescoping members 126a and 128a can be properly positioned so that the seat rows 12a would be in proper position for locking engagement to the tracks 18a. A further embodiment of the present invention is illustrated in Figure 15. Components which are similar to components of the earlier embodiment will be given like numerical designation, with a "b" suffix distinguishing those of the embodiment of Figure 15. In this embodiment of Figure 15, there is a mounting and locking assembly 24b having a retaining foot member 90b with two retaining feet 92b. There is a locking member 94b having a locking element or plunger 116b that fits in a matching opening in the track 18b. Further, the locking member 94b has a lower cam surface 118b which engages the upper surface of the track 18b to lift the retaining foot member 90b so as to bring the retaining feet 92b into firm engagement with the track 18b. As shown in Figure 15, with the locking member 94b in its locking position, the cam surface 118b is almost directly below the pivot connection 98b of the locking member 94b to the retaining foot member 90b. In this embodiment of Figure 15, instead of operating the locking member 94b by means of an actuating rod, this locking member 94b is attached to a track cover member 124b. In this particular arrangement, the track cover member 124b has generally the same overall configuration as the forward telescoping member 126 of the first embodiment. However, the track cover member 124b is not made as a telescoping member. To accommodate for the different spacing between the seat units, the swing end of the track cover member 124b can be made with a flexible end portion or possibly a hinge mounted swing end portion. Thus, when the pitch (i.e. spacing) of the seat units is smaller, the flexible end of the cover member 124b could be deflected upwardly and attached to the related forward leg of the seat row. To describe the operation of the embodiment of Figure 15, when it is desired to move one or more of the seat rows, the cover members 124b are rotated upwardly to bring the locking members 94b out of locking engagement with the tracks 18b. After the seat units are rolled to the desired location, then the track cover members of the seat unit that was moved are moved down into their track engaging positions, with this motion also bringing the locking members 94b into locking engagement. In other respects, the operation of this embodiment of Figure 15 is substantially the same as described above with respect to the other embodiments. It is to be understood that various modifications could be made to the seating system with these various embodiments, and without departing from the basic inventive features thereof.

Claims: An adjustable seating system (10,10a) adapted for use in a passenger vehicle, such as a passenger aircraft, said system (10,10a) comprising: a. a track assembly having a longitudinal axis and comprising at least two tracks (18,18a), each having a related lengthwise axis parallel to the longitudinal axis, with each track (18,18a) comprising: 1. a pair of laterally spaced flange members (36,36a) extending along the lengthwise axis and reaching laterally toward one another to form a related track passageway which extends along the lengthwise axis of the track (18,18a); 2. the two flange members (36,36a) of each track (18,18a) being formed with lateral recesses (40,40a) which provide enlarged openings (40-40,40a-40a) which are positioned at regularly spaced intervals along said lengthwise axis, with the enlarged openings (40-40,40a,40a) being interconnected by narrower openings (42,42a) defined by related retaining flange portions (38,38a) positioned between related adjacent pairs of the enlarged openings; and b. a plurality of seating units (12,12a) mounted to the track assembly along the longitudinal axis, each seating unit (12,12a) having: i. a traction assembly (26,26a), ii. at least two mounting and locking assemblies (24,24a), each of which operatively engages a related one of the two tracks (18,18a), each mounting and locking assembly (24,24a) comprising: 1. a retaining foot member (90,90a) connected to said seating unit (12,12a) and having at least one foot (92,92a) positioned withing the track passageway of its related track (18,18a) , said foot (92,92a) being adapted to engage selected related retaining flange portions (38,38a) of its related track (18,18a); and 2. a locking member (94,94a) having a locking element (116,116a) and being mounted for movement between a locking position where the locking element (116,116a) is positioned in one of said enlarged openings (40-40,40a-40a) to prevent fore and aft movement of said mounting and locking assembly (24,24a) and a release position where said locking element (116,116a) is removed from said one of said enlarged openings (40-40, 40a-40a), said retaining foot member (90,90a) being positioned beneath at least one of said retaining flange portions (38,38a) and iii. unlocking actuating means (102-110, 102a-110a) operatively connected to the locking members (94,94a) of the seating unit (12,12a) to move the locking members (94,94a) from their locking into their release positions; whereby the seating units (12,12a) can be moved to selected locations by moving the actuating means (102-110,102a-110a) of the seating units (12,12a) which are to be moved to the unlocking position, and moving the seating units (12,12a) along said track assembly, said system (10,10a) being characterized in that said traction assembly (26,26a) comprises at least two traction wheels (66,66a) each of which engages a related one of said two tracks (18,18a) each traction wheel (66,66a) having a peripheral portion with a plurality of protrusions (68,68a) positioned and spaced relative to one another so as to match postioning and spacing of the enlarged openings (40-40,40a-40a) of its related track (18,18a), the traction wheels (66,66a) of each traction wheel assembly (26,26a) being operatively interconnected in a manner that rotation of a first one of said traction wheels (66,66a) causes a corresponding rotation of a second one of the traction wheels (66,66a) so that with the two traction wheels (66,66a) engaging their related tracks (18,18a) rates of travel of the two wheels (66,66a) over their related tracks (18,18a) are equal. The system according to claim 1 , characterized in that each said locking member (94,94a) is pivotally mounted to its related retaining foot member (90,90a) for pivoting movement between said locking position and said release position, and in that each of said unlocking actuating means (102-110,102a-110a) also acts as a locking actuating means (102-110,102a-110a) and comprises a manually operated lever means (110,110a) positioned adjacent its related seating unit (12,12a). The system according to claim 1, characterized in that each unlocking actuating means also acts as a locking actuating means, and comprises a lever member (124b) operatively connected to said locking member (94b) at a location adjacent its related track (18b), said lever member (124b) being configurated and arranged so that in its locking position, the lever member (124b) fits over and covers a section of said track (18b) adjacent to its related mounting and locking assembly (24b). The system according to any one of the preceding claims, characterized by roller means (122,122a,122b) positioned adjacent each mounting and locking assembly (24,24a, 24b) ; each of said roller means (122,122a, 122b) being positioned relative to its related mounting and locking assembly (24,24a,24b) in a manner that movement of said locking member (94,94a,94b) to its release position brings said roller means (122,122a,122b) into bearing engagement with its related track (18,18a,18b) to facilitate movement of its related seating unit (12,12a,12b). The system according to any one of the preceding claims, characterized in that each said locking member (94,94a,94b) is arranged so that movement of the locking member (94,94a,94b) to the locking position causes the locking member (94,94a,94b) to have an operative lifting engagement between its related track (18,18a,18b) and the related foot member (90,90a,90b), to press said retaining foot member (90,90a,90b) upwardly against the retaining flange portions (38,38a,38b) to prevent rattling motion of said mounting and locking assembly (24,24a,24b). The system according to claim 5, characterized in that each said locking member (94,94a,94b) has a downwardly facing cam surface (118,118a,118b) which engages an upwardly facing surface of said track member (19,18a,18b) said cam surface (118,118a,118b) being arranged in a manner that rotational movement of said locking member (94,94a,94b) to its locking position causes camming engagement of said cam surface (118,118a,118b) to raise said retaining foot member (90,90a, 90b). The system according to any one of claims 1,2 or 4-6, characterized by a plurality of track cover assemblies (124,124a), each track cover assembly (124,124a) comprising at least two telescoping cover members (126,128,126a, 128a), with each track cover assembly (124,124a) being positioned over a related track section (18,18a) that extends between adjacent seating units (12,12a). The system according to claim 7, characterized in that at least some of said track cover members (126,128,126a, 128a) have spaced marking means (148,148a) thereon, corresponding to spacing of the enlarged openings (40-40,40a-40a) of the track (18,18a), whereby with one seating unit (12,-12a) being properly positioned relative to the track assembly for locking engagement thereto, an adjacent one of said seating units (12,12a) can be positioned in accordance with the marking means (148,148a) on the track cover assembly (124,124a) so as to be properly positioned for locking engagement to the track assembly. The system according to claim 7 or 8, characterized in that the cover members (126,128,126a,128a) of each track assembly have interengaging stop means (142-146,142a-146b) which limits telescoping movement of the two track cover members (126,128,126a,128a) toward and away from one another, one of said cover members (126,126a) being connected to one seating unit (12,12a) and a second of said cover members (128,128a) being connected to a second adjacent seating unit (12,12a). The system according to claim 9, characterized in that said system (10,10a) is arranged to provide minimum and maximum spacing distances between adjacent seating units (12,12a), said stop means (142-146, 142a-146b) of the cover assemblies (124,124a) being arranged to limited relative travel between adjacent seating units (12,12a) to said minimum and maximum distances. The system according to any one of the preceding claims, characterized by a power unit (76,76a) adapted to operatively engage and cause rotation of at least oen traction wheel (66,66a) of one of said traction wheel assemblies (26,26a) of one of said seating units (12,12a) to cause movement of said one of said seating units (12,12a).

Inventors: GORGES, FREDERICK J.
Applicants: THE BOEING COMPANY
Application year: 1986
Main classification: B64D11
IPC codes: B60N2, B64C1, B64D11