Stadium Seat Stabilisation Systems

Abstract

A stadium fitting stabilization system comprising a rail 12 having an upper surface 16, a front overhang 15, and a rear overhang 17; The system further comprises a support member 61 for securing a fit

Description

The present specification relates to stadium seat stablisation systems, particularly for the stabilisation and / or securement of seats, seat parts and other stadium fixings to a rail. Seating systems in stadiums, arenas, and other entertainment venues are typically arranged in rows, either on the floor or in a tiered or stepped format. A common method of mounting the seats in a ganged format in rows is to assemble the seating onto a structural elongate section or rail. These seating rails can be constructed from a variety of materials such as hollow steel sections, aluminium extrusions, or even composite materials like glass-reinforced plastics. The rails are usually attached to the building on support legs provided at intervals, and the seats attached directly to the seating rail. Both the support legs and the seat connections to the rail must be secure to eliminate movement. Various seating rails and seats adapted to fit the profiles of these seating rails have been adopted. Seating rails are expensive to produce and install, and being constructed from very durable materials, they typically outlast the seating affixed to them. The seats themselves are typically manufactured from plastics, wooden preforms, and upholstery, which are subject to high degrees of degradation, especially in outdoor environments. Therefore, they may need to be replaced well before the seating rail, possibly several times over many years. One such rail and seating system is disclosed in US7073858 (which is incorporated by reference herein). Referring to figure 3 of '858, the rail includes an upper portion having an upper surface 16, front overhang or nose 15 and a rear overhang 17. Referring to figure 8 of '858, the support member 61 of the seat features a clamp portion 68 and return portion 69 which hooks over the rear overhang 17 of the rail, while and intermediate portion 70 of the support member rests on the upper surface 16 of the rail and a forwardly directed portion 71 of the support member extends beyond the front overhang or nose 15. A toggle fastener 72 attached to the forwardly directed portion 71 and engages with the underside of the front overhang or nose 15, securing the support to the rail. Unfortunately, if the profile of the support member 61 does not closely match the corresponding profile of the rail, movement can occur between the support member and rail. This can occur for various reasons, the chief reason being that the support member is typically fabricated from glass reinforced polymer. This material will often shrink anisotropically, depending on the orientation of the glass strands in the plastic material, the orientation of the glass strands itself depending on how the material fills the mould. Though less of a factor, the moulds for the support member and the extrusion die for the rail 12 also can be subject to wear. Therefore, the tolerance of both parts, though particular the support member 61, can vary, resulting in a mismatch between these ideally corresponding parts, making it very difficult to maintain a close or interference fit between the seating rail and the resulting fit-up, resulting in a loose fit. Unfortunately, no amount of pressure applied by the toggle fastener can correct such a mismatch between the curved clamp portion of the support member and the rear overhang of the rail. The object of this invention is to provide a system which improves the securement of a seat to a rail and reduce or eliminate movement between the seat and rail. According to the present invention, there is provided a according to claim 1. The terms forward and rear, and similar cognate terms, are used herein with reference to a seat positioned on a rail, the seat back being a rearward part of the seat. The invention will now be described, by way of example, with reference to the drawings, of which Figure 1 is a perspective view of an embodiment of the seat stabilisation system; Figure 2 is a perspective view of a detail of the seat stabilisation system; Figure 3 is a sectional view of a detail of the seat stabilisation system; Figure 4 is a perspective view of another embodiment of the seat stabilisation system; Figure 5 is a perspective view of a detail of the seat stabilisation system of figure 4; Figure 6 is a side elevation of the seat stabilisation system of figure 4; Figure 7 is a sectional view of an embodiment of an arm rest stabilisation system; Figure 8 is a perspective view of the arm rest stabilisation system of figure 7; and Figure 9 is a partially exploded perspective view of the arm rest stabilisation system of figure 7. Referring to figure 1, a seat 10 is secured to a rail 12 by support member 61. The rail 12 is as disclosed in US7073858 (which is incorporated by reference herein), and discussed above, comprising an upper portion having an upper surface 16, front overhang or nose 15 and a rear overhang 17, formed from extruded aluminium. The leg or support member 61 of the seat features a clamp portion 68 and return portion 69 which hooks over the rear overhang 17 of the rail, while an intermediate portion 70 of the support member rests on the upper surface 16 of the rail and a forwardly directed portion 71 of the support member extends beyond the front overhang or nose 15. It also includes a toggle fastener 72 attached to the forwardly directed portion 71 and engages with the underside of the front overhang or nose 15, securing the support to the rail. In these respects, it is similar to the seat disclosed in US7073858. The support member 61 also includes a wedge 20 which fits in a pocket 22 in the support member 61. Referring to figures 2 and 3, the pocket 22 is generally defined by the upper wall 26 of the intermediate portion 70, lateral side walls 24, 25, and the central web 27 that connects the upper wall 26 and the lower wall 27 of the support member 61. The lower wall 27 has an aperture 30 such that the pocket has unobstructed communication with the upper surface 16 of the rail 12. The central web 29 is the only vertical structure of the intermediate portion 70 of the support member 61 in this location, thus the pocket is open on one side, allowing insertion of the wedge 20. The pocket 22 includes downwardly extending lead-in ribs 28 on the upper wall 26, these ribs 28 being tapered from the central web 29 to the lateral mouth of the pocket 22 (i.e. the ribs 28 depend more at towards the central web 29 than at the mouth of the pocket 22). The wedge 20 is tapered so that the face inserted into the pocket is shorter than the opposite face; in particular, the upper and lower surfaces of the wedge 20 narrow towards the inserted end (the side faces are ideally parallel and not tapered). The wedge 20 has a slot elongated in a substantially vertical direction which accepts a self-tapping screw, while the central web 29 of the pocket 22 includes a boss 31 having a bore aligned to accept this self-tapping screw as it extends through the wedge 20. Turning the self-tapping screw 21 then cuts a thread into the boss 31 and draws the wedge 20 into the pocket 22 towards the central web 29, the head of the self-tapping screw 21 abutting the outside of the elongate slot. As the wedge 20 is urged into the pocket 22, the taper of the wedge 20 and the ribs 28 are such that the wedge 20 is forced downwards, the lower surface of the wedge 20 moving downwardly through the aperture 30 in the lower wall 27 of the intermediate portion 70 of the support member 61. The elongate slot accommodates this movement, so that the selftapping screw rides upwards relative to the wedge 20 even as it urges the wedge 20 into the pocket 22. Thus, when the support member 61 is located on the rail 12, insertion of the wedge 20 and its advancement towards the central web 29 by turning the self-tapping screw 21 forces the lower surface of the wedge 20 against the upper surface 16 of the rail 12, the wedge 20 exerting and upward force on the support member 61 and a downward force on the upper surface 16 of the rail 12, raises the bottom of the return portion 69 of the support member 61 against the rear overhang 17 of the rail 12, securing the position of the support member 61 against the rail 12. This securement takes place even if there is play between the support member 61 (and in particular, the return portion 69 of the support member 61 and the rear overhang 17 of the rail 12). Thus, the provision of the wedge 20 and corresponding pocket 22 in the support member 61 allows the seat to be fully secured even when the tolerance of the support member 61 is not ideal. Ideally, the wedge 20 and pocket 22 are provided on each support member 61 of a seat 10, and each pocket 22 opens towards the inside of the seat 10, though of course the pocket 22 could open outwardly, and a benefit would be derived from using a pocket 22 and wedge 20 even on one support member 61 of the seat 10. Referring to figure 4 to 6, rather than a wedge 20, a cammed insert 32 is insertable into the pocket 22 of the support member 61 in the intermediate portion 70. As in the previous embodiment, the pocket 22 is defined by the upper wall 26 and side walls 24, 25 of the support member 61, and the lower wall 27 of the support member 61 includes an aperture communicated with the upper surface 16 of the rail 12. The cammed insert 42 is generally cylindrical in form, and includes an eccentric through bore through which a self-tapping screw 43 extends. The central web 29 includes a boss 44 with a bore to accept the self-tapping screw 43. As the self-tapping screw 43 is rotated, it cuts a thread in the bore of the boss and the head of the self-tapping screw 43 engages the through bore of the cammed insert 42, drawing the cammed insert 42 inwardly into the pocket 22. The outer face of the cammed insert 42 includes a slot 45 which allows the cammed insert 42 to be rotated. Since the bore of the cammed insert 42 is eccentrically aligned, rotation of the cammed insert 42 causes the perimeter of the cammed insert 42 adjacent to the upper surface 16 of the support member 61 to first approach and then abut and press against the upper surface 16 in the manner of a projecting lobe of a cam, the cammed insert 42 exerting a downward force on the upper surface 16, and a corresponding upward pressure (via the self-tapping screw 43) on the support member 61. Thus, by driving the cammed insert 42 into the pocket 22 of the support member 61, the cammed insert 42 raises the bottom of the return portion 69 of the support member 61 against the rear overhang 17 of the rail 12, securing the position of the support member 61 against the rail 12 even where there is play between the support member 61 (and in particular, the return portion 69 of the support member 61 and the rear overhang 17 of the rail 12). As for the previous embodiment, the provision of the cammed insert 42 and corresponding pocket 22 in the support member 61 allows the seat to be fully secured even when the tolerance of the support member 61 is not ideal. It will be realised that the cammed insert 42 could be formed in similar shapes, such as an elliptical or oval cross section, to exert a force when rotated. The rotation of the cammed insert 42 could be achieved by other means, for example more than one slot could be provided on the face of the cammed insert 42 so that some form of corresponding key could be used to conveniently turn the cammed insert, or the boss 44 and the cammed insert could feature cooperating surfaces which are both inclined to the axis of the screw, urging the cammed insert 42 to rotate when the face of the cammed insert 42 contacts the face of the boss 44. In both the embodiments described and shown in figures 1 to 5, an adjustment and securement member is inserted into a pocket 22 in the support member 61 from a generally transverse direction to the main axis of the support member, and generally opposing surfaces of that member exert a force up substantially upwards on the support member, and substantially downwards on the upper surface of the rail in order to raise the bottom part of the return portion of the support member against the rail. This principle can also be applied to other fittings that attach to the rail 12. Further, the direction in which the adjustment and securement member does not have to be inserted in a transverse direction. Referring to figures 7 to 9, an arm rest 50 includes a support portion 51, which, in a similar manner to the support member 61 of the previous embodiments, features a clamp portion 68 and return portion 69 which hooks over the rear overhang 17 of the rail, and intermediate portion 70 of the support portion 51 rests on the upper surface 16 of the rail and a forwardly directed portion 71 of the support portion 51 extends beyond the front overhang or nose 15. A clamp 72 is attached to the forwardly directed portion 71 and engages with the underside of the front overhang or nose 15, to generally securing the support to the rail. The arm rest 50 includes a lower cavity 52 whose upper extent is defined by an internal wall 54, which is generally transversely aligned to the main axis of the upright portion of the arm rest 50. The intermediate portion 70 of the support portion 51 includes an aperture 30 which openly communicates with the upper surface 16 of the rail 12. A shaped wedge 55 is located in the lower cavity 52, and the front wall 64 of the arm rest 50 includes a hole 56 having a threaded insert 63. When a bolt 62 is advanced rearwardly through the hole 56 and threaded insert 63 into the lower cavity 52, the end of the bolt 62 abuts the shaped wedge 55 and urges it in a rearward direction. The internal wall 54 is less inclined from the horizontal than upper surface 16 of the rail 12, so that the distance between the internal wall 54 and upper surface 16 is greater towards the front of the arm rest 50 than towards the rear of the arm rest 50. The shaped wedge 55 tapers so that the narrower end is oriented towards the rear of the arm rest 50. Therefore, as the bolt 62 urges the shaped wedge 55 rearwards, the lower surface of the shaped wedge 55 comes to bear through the aperture 30 of the support portion 51 against the upper surface 16 of the rail 12, and the shaped wedge 55 exerts and upwards force on the support portion 51 and a downward force on the rail 12, raising the bottom of the return portion 69 of the support portion 51 against the rear overhang 17 of the rail 12, securing the position of the support portion 51 against the rail 12. As in the previous embodiments, this securement takes place even if there is play between the support portion 51 (and in particular, the return portion 69 of the support portion 51 and the rear overhang 17 of the rail 12). Thus, the provision of the shaped wedge 55 and corresponding lower cavity 52 in the support portion 51 of the arm rest 50 allows the arm rest to be fully secured even when the tolerance of the support portion 51 is not ideal. The essence of these embodiments is that a moveable insert is translated a cavity in the support portion of a fitting to the profiled rail, this translation causing a surface of the moveable insert to be urged against the rail through an aperture in the cavity, lifting the fitting upwards relative to the rail and so raising the return portion of the support portion to bear securely against the rear overhang of the rail, securing the fitting against the rail even when the conformity between the support portion and the rail does not have an ideal tolerance. The screws of bolts used to urge the inserts (whether a wedge or a cammed insert) may be adapted to be rotated either by a conventional screwdriver or by a hex key, or by some other driving means. In this specification an apparatus / method / product "comprising" certain features is intended to be interpreted as meaning that it includes those features, but that it does not exclude the presence of other features. Many variations are possible without departing from the scope of the present invention as defined in the appended claims.

Claims

1: A stadium fitting stabilization system comprising:a rail having an upper surface, a front overhang, and a rear overhang;a support member for securing a fitting to the rail, the support member including:a clamp portion and a return portion configured to hook over the rear overhang of the rail,an intermediate portion resting on the upper surface of the rail and extending to a forwardly directed portion beyond the front overhang, a pocket defined within the intermediate portion of the support member, the pocket having an aperture communicating with the upper surface of the rail;a moveable insert configured to be received in the pocket and engage the upper surface of the rail, the moveable insert including a fastener which engages the moveable insert;such that advancement or rotation of the fastener translates the moveable relative to the pocket, causing the moveable insert to exert an upward force on the support member and a downward force on the rail through the aperture, securing the support member against the rail.2: The stadium fitting stabilization system according to claim 1, wherein the moveable insert is a wedge having a tapered shape.3: The stadium fitting stabilization system according to claim 2, wherein the wedge includes an elongated slot for the fastener.4: The stadium fitting stabilization system according to either claim 2 or 3, wherein the pocket includes an inclined upper surface.5: The stadium fitting stabilization system according to claim 1, wherein the moveable insert is a cammed insert having a generally cylindrical form with an eccentric through bore, such that rotation of the fastener causes the cammed insert to rotate and press against the upper surface of the rail.6: The stadium fitting stabilization system according to claim 5, wherein the cammed insert and the pocket include inclined faces that interact to force the cammed insert to rotate and exert a force on the rail.57: The stadium fitting stabilization system according to claim 1, where the pocket is a lower cavity having an internal wall and an aperture communicating with the upper surface of the rail,the moveable insert being a shaped wedge located in the lower cavity, the shaped wedge10 tapers towards the rear of the fitting, and configured to be urged rearwards by a bolt, such that the shaped wedge exerts an upward force on the support portion and a downward force on the rail through the aperture, securing the fitting against the rail.8: The stadium fitting stabilization system according to claim 7, wherein the bolt extends15 through a hole in the front wall of the support member and threads into an insert within the lower cavity, urging the shaped wedge rearwards when advanced.9: A stadium fitting according to any previous claim.10

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