Grid ceiling

Abstract: A grid ceiling comprising, a plurality of elongate first support members 10, said first support members having parallel longitudinal axes 11; a plurality of elongate second support members 12, said second support members having parallel longitudinal axes 13 angled with respect to the longitudinal axes 11 of the first support members, to define therewith a grid with polygonal first openings 16 therein; a first grid element 24 inserted in at least one of said first openings 16, the or each grid element defining therein at least one second opening 30; and a second, smaller grid element 40 inserted in said at least one second opening 30 of the first grid element 24, or of at least some of the first grid elements.

Description: The present invention relates to grid ceilings. Many different forms of grid ceilings have been proposed, these usually being designed to cover up services such as water and gas feed pipes, electric wiring, air conditioning and the like. For example US Patent Nos. 4658562 and 4665674 show one particular form of ceiling, in which a main grid is provided and into each of the rectangular openings in this grid is fitted a grid panel. A somewhat different structure is shown in US Patent No. 4625470 in which each grid panel is, in effect, formed by two T-shaped members, the stem and the arms of which are hinged to one other. These grid ceilings are generally satisfactory, but give a rather limited visual effect. It is an object of the present invention to provide the facility for giving a greater variety of visual effect. Document EP-A-0210385, which represents the closest state of the art, discloses a grid ceiling which corresponds to the preamble of claim 1. The problem of the invention is solved by the combination of features of claim 1. With such a structure one can readily modify the format of the second smaller grid element which can be inserted in all or in some of the second openings in a variety of different arrangements to give a totally different visual effect. The first grid element comprises a plurality of first elongate members angled with respect to one another effective to define said at least one second opening, whereby said at least one second opening is of polygonal shape. The second grid element may comprise a plurality of second elongate grid members angled with respect to one another, the second grid members being shorter in length than the relevant parallelly extending first grid members. In this way one can have progressively smaller grid elements. Desirably the first grid elements are mounted at a level different from the level of the first and second support members and alternative or additional, the second grid elements are mounted at a level different from the first and second support members and indeed may be at a level different from the first grid elements. A third opening is defined in the, or each second grid element and a light fitting or a third grid element is advantageously mounted in the third opening. Additional grid elements can continue to be mounted in this way. If the grid elements are mounted at different levels, as suggested above, one can produce, in effect, a pyramidal shape in each opening in the support members. In order that the present invention may more readily be understood, the following description is given, merely by way of example, reference being made to the accompanying drawings in which:- Figure 1 is a perspective view showing a portion of one embodiment of grid ceiling according to the invention; Figure 2 shows, in perspective, first and second grid elements of the ceiling of Figure 1, prior to being assembled; and Figure 3 is a view similar to Figure 1, but showing a larger portion of a second embodiment of grid ceiling according to the invention. Referring first to Figure 1, there is illustrated therein a presently preferred embodiment of grid ceiling according to the invention. This comprises a support grid comprising a plurality of elongate first support members 10, having longitudinal parallel axes 11 and a variety of elongate second support members 12, the second support members having parallel longitudinal axes 13 angled in the embodiment illustrated at right angles to the axes 11 effective to define therewith the grid with polygonal in this instance, rectangular first openings 16 therein. The support members 10,12 in this construction are each in the form of U-profiled sheet metal members having a lower web 18, side flanges 20 these having inturned rims 22 at their upper edges. Mounted within some, or all, of the openings 16 are first grid elements 24 which are each formed of a plurality of first elongate grid members 26 (Figure 2) and second elongate grid members 28, defining a central second opening 30. The grid members 26,28 are again each of U-profiled sheet metal, similar to the support members 10,12 and they may be formed of the same cross section material or, as shown, of smaller cross section material. The grid members 26 each have intermediate their ends cutouts extending upwardly from the web portion of the grid member 26 to about half the height of the grid member 26 while the second grid members 28 have similar, complementary cutouts whereby the members 26,28 can be interfitted, as shown in the drawings, to define end portions 31,32 which are notched at 34,36. The distance between the ends of the grid members 26, defined by the notches 34 at the ends thereof, is chosen to be a close fit between the side walls or flanges 20 of the support members 12 so that the unnotched portions 35 thereof rest on the rims 22 and prevent the grid moving in that direction. Similarly the lengths of the grid members 28 between the notched portions 36, at the ends thereof, is adapted to the spacing between the support members 10 so that the unnotched portions 37 of grid members 28 rests on the rims of the support members 10. In a similar way, second grid elements 40, which are identical, but of smaller dimensions, are mounted in the openings 30 and define a third opening 42 in which a third grid element 44, again of identical but smaller construction is mounted. This again defines a further central opening 46 in which a further grid element 48 is mounted. In the embodiment shown, because of the provision of the notches 36 in each of the grid members, these notches extending approximately 2/3rds of the way up the length of the associated grid member, each grid element is mounted higher than the support grid, the second grid element is mounted higher than the first grid element and so on. In this way a generally pyramidal structure can be provided. For internal use, the grid elements may simply be retained in place by gravity. For external use, where the assembly may be subjected to winds and other environmental problems, it may be advantageous for the grid elements to have means positively to retain them in place and for this reason there is illustrated in Figure 2 a rounded protrusion 50 on the end of each notched end portion 34,36 and this is adapted to be engaged in a corresponding opening in the adjacent support member 10,12. Second and subsequent grid elements may be retained by similar protrusions engaging in similar corresponding openings 52 of a surrounding grid element. In the second embodiment of ceiling shown in Figure 3, like parts have been indicated by like reference numerals. As before, there are a plurality of elongate first support members 10 and elongate second support members 12 defining rectangular first openings 16 therein. Mounted within these openings 16 are first grid elements 24 which are each formed of a plurality of first elongate grid members 26 and second elongate grid members 28, in a similar manner to that described above. The second grid elements again define a second central opening 30 in which is mounted, in a similar way, second grid elements 40 which are identical, but of smaller dimensions with the first grid elements 24 and define a third opening 42. At this point, however, there is a variation as compared with that of the first embodiment. In the third opening 42 is mounted a different form of third grid element 60. In this construction the third grid element 60 consists of a cross-shaped member defined by a first elongate element 62 and a second elongate element 64. It will be seen that this gives rather a different visual effect. At the centre of the grid shown in Figure 3 there is mounted a further possible "third element", namely, a light fitting 70. It will be appreciated that in a given ceiling several such light fittings could be mounted at appropriate locations. The structure of the present invention is therefore very well adapted to significant variations to suit the requirements of a particular ceiling designer desiring to give a particular visual and/or lighting effect.

Claims: A grid ceiling comprising a plurality of elongate first support members (10), said first support members (10) having parallel longitudinal axes (11); a plurality of elongate second support members (12), said second support members (12) having parallel longitudinal axes (13) angled with respect to the longitudinal axes (11) of the first support members (10), to define therewith a grid with polygonal first openings (16) therein; a first grid element (24) inserted in at least one of said first openings (16), the or each first grid element (24) defining therein at least one second opening (30), said first grid element (24) comprising a plurality of elongate grid members (26,28) effective to define said at least one second opening (30), whereby said at least one second opening is of polygonal shape, the first and second support members each being U-profiled sheet metal members, the grid members of the first grid element (24) each having the same or a smaller U-profile cross-section than the support members (10,12), characterised in that, a second smaller grid element (40) is inserted in said at least one second opening (30) of the first grid element (24), or of at least some of the first grid elements, said second grid element (40) comprising means defining a third opening (42). A grid ceiling according to claim 1, characterised in that the elongate grid members of said first grid element (24) comprise first grid members (26) and second grid members (28) angled with respect to said first grid members (26). A grid ceiling according to claim 1 or 2, characterised in that further elongate grid members of said at least one second grid element (40) are angled with respect to one another and shorter in length than the relevant parallel extending first and second grid members (26,28). A grid ceiling according to claim 1, 2 or 3, characterised in that the U-profile sheet metal members have inturned rims (22) at their upper edges and in that the lower portion of each end portion (31,32) of the first grid members (26,28) are notched (34,36), the unnotched portions (35,37) thereof resting on the rims (22) of the support members (10,12) so that when the first grid element (24) is inserted in said first opening (16), the level of the lower web of the first grid members (26,28) is higher than the level of the lower web (18) of the support members (10,12). A grid ceiling according to any preceding claim, characterised in that the second grid members of the second grid element (40) have a cross section which is identical to the cross section of the first grid members (26,28), and in that the lower portion of each end portion of the second grid members are notched, the unnotched portions thereof resting on the rims of the first grid members (26,28), so that when the second grid element (40) is inserted in said second opening (30) the level of the lower web of the U-profile second grid members is higher than the level of the U-profile of the lower web (18) of the support members (10, 12). A grid ceiling as claimed in any preceding claim, characterised in that said second support members are arranged perpendicular to said first support members whereby said first openings are substantially rectangular. A grid ceiling as claimed in any preceding claim, characterised in that said first grid members are arranged perpendicular to one another, whereby said second openings are substantially rectangular. A grid ceiling as claimed in any preceding claim, characterised in that said second grid members are arranged substantially perpendicular to each other. A grid ceiling as claimed in any preceding claim, and further comprising means defining a third opening (42) in the or each said second grid element (40) and a third grid member (44,60,70) mounted in said third opening (42). A grid ceiling as claimed in any preceding claim, and further comprising means defining a third opening in the or each second grid element (40) and a light fitting in at least some of said third openings. A grid ceiling according to claim 9, characterised in that said third grid member comprises a cross-shaped member (60) defined by further elongate elements (62,64).

Inventors: HEICHBERGER JOHN J, TELI JONATHAN P, HEICHBERGER, JOHN J., TELI, JONATHAN P.
Applicants: HUNTER DOUGLAS INTERNATIONAL, HUNTER DOUGLAS INTERNATIONAL NV
Application year: 1991
Main classification: E04B9
IPC codes: E04B9