Support structure for office tables and desks including those with several supporting planes

Abstract: The subject of the present invention is a unit-composed supporting structure for office tables and desks, constituted of a cylindrical connecting element having a substantially horizontal axis (2), equipped with a plurality of lateral connectors (7), to some of which there are connected two or more pairs of inclined legs (1), diverging downwards at least in a vertical plane perpendicular to the axis of the connecting element, there being connected to said legs and/or said tubolar body a plurality of support elements (3, 27) for one or more working planes, projecting horizontally and transverse and/or oblique with respect to the axis of the connecting element, at the upper end (8a) of which legs there may be present connector member (32) to which there may be attached pairs of uprights carrying an upper plane and/or other members raised above the working plane.

Description: In working furniture, especially for offices and the like, the requirement arises for having available supporting structures adapted for the construction of tables, desks and so on which may be rapidly assembled, offering high rigidity, and which may also enable several supporting and working planes to be provided according to requirements, either as isolated items of furniture or as contiguous structures connected together to form multiple working units, adapted for the use of several persons. In particular the demand arises for having available an item of furniture, the supporting structure of which enables several carrying or support planes to be provided both below the working plane and above it, for arranging, for instance, documents and volumes, calculating equipment, visual display screens, telephonic apparatus and so on, in a single unitary structure of high rigidity. An item of furniture known in the art is disclosed in EP-A-0 108 559 and forms the basis of the preamble of independent claim 1. For the production of tables for a wide variety of purposes, especially office tables and the like, with productive, aesthetic assemblies, the problem arises also of having available a structure which will enable tables of various dimensions to be constructed, whether rectangular, square or circular, high or low, while keeping the greatest possible number of components unchanged, with a firm structure which lends itself to assembly or erection in a simple manner, it being possible also to vary the height of the table itself from the floor. Said results are achieved by the present invention as defined in independent Claim 1. According to one form of embodiment, the legs are composed of a rectilinear cylindrical element, equipped in its upper part with a portion of substantially triangular shape with the apex downwards, connected to the rectilinear cylindrical element, the base side of the triangular shaped portion being capable of being connected, by screw connectors, to the cylindrical connecting element, there being also provided, near to the ape: of the triangular shaped portion, a connector for a transverse member, by which two mutually facing triangular portions, connected at the top to the same tubular member, are connected to each other in a position diverging downwards in a plane transverse to the axis of the connecting element, there being also present, at the lower ends of the legs, support feet for bearing upon the floor, adjustable in height. In a median position on the base side of the triangular portion of each leg, there is an upwardly facing stub pipe, equipped with connectors for vertical columns. At the ends of the base side of the triangular portion of each leg, there are slides adapted for accommodating transverse members for supporting a working plane, in cooperation with clamps which can be clamped on the slides themselves for blocking the transverse members in position. In the support structure according to this invention, there may be present two pairs of uprights connected to the vertical stub pipes of two pairs of contiguous legs, to the upper ends of which uprights there are connected load-bearing cruciform pieces fitted to the ends of horizontal cylindrical support elements, to which elements there may be fitted support planes, suspended shelves, lamps, office equipment, lamps or the like. The vertical columns may also comprise lifting actuators adapted for the vertical translatory movement of the horizontal support elements and the elements fitted to them, between an access position for the elements themselves, near to the working plane, and an at-rest position, remote from the working plane. In one alternative form of embodiment, the legs are constituted each of an upper cranked cylindrical element, capable of being connected to one of the connectors of the connecting element, to which cranked element there is fitted a rectilinear cylindrical element, connected in its turn at the end to a support foot for bearing on the floor, comprising a cranked element having an end portion with a substantially vertical axis, inside which there is inserted a bolt carrying at its end a support member, which bolt may be inserted in two positions, corresponding to different values of downward projection. The support member may be composed of an articulated disc, a fixed or pivotal roller, or similar means. The support arms are constituted of pairs of mutually opposed arms, connected together at one end and equipped at the top with connectors capable of being coupled to the threaded connectors of the connecting element, the arms being equipped also at their ends with bearing and fixing members for the working plane. The end support arms are connected together at an angle. The connecting element, is advantageously composed of a tubular member having a rectilinear median portion with horizontal axis, equipped with a pair of threaded connectors diametrally opposite each other along a horizontal diameter passing through the centre line, and having oblique, downwardly orientated end portions with an axial inclination equal to that intended for a pair of legs, these end portions being equipped with connector heads adapted for the attachment of the rectilinear cylindrical element of the legs. In the case of a table having a plane which is circular, square or of reduced length, the arms are preferably arranged in a group of four, connected together at one end and angled one from another, in opposite pairs, equipped at the top with members for fixing to the threaded connectors of the tubular member, it being possible for two legs of a pair lying in a plane perpendicular to the pair of legs connected to the inclined portions of the tubular member to be connected to the connectors themselves externally to said connectors. Further details will become apparent from the following description of examples of embodiment of the invention, with reference to the attached drawings, in which there are shown: in Fig. 1, a table having a structure according to this invention in one form of embodiment, in perspective view, with the working plane transparent; in Fig. 2, the table of Fig. 1 in lateral view; in Fig. 3, the front view of the table of Fig. 1; in Fig. 4, an alternative form of the table of Fig. 1, in perspective view, with a support frame for a circular plane; in Fig. 5, a table having a structure according to this invention in an alternative form of embodiment, in perspective view; in Fig. 6, the structure of the table according to the alternative form of Fig. 5, in partial perspective view, partly in section; in Fig. 7, the table of Fig. 5 in front view; in Fig. 8, a detail of the support legs for the table of Fig. 5, in lateral view; in Fig. 9, the detail of the support legs of Fig. 8, in front view; in Fig. 10, a detail of the support members for the plane of the table of Fig. 5, in front view; in Fig. 11, the detail of Fig. 10 in lateral view; in Fig. 12, a working table having several positions and with an upper support plane having a structure according to this invention, in front view. As Fig. 1 shows, the structure according to this invention, in a first form of embodiment applicable to a rectangular table, is constituted of a support frame comprising four legs 1, connected at the top to a connecting element 2, to which there are in turn fixed a plurality of support arms 3 for the plane 4, the plane being fixed to them or simply resting upon suction cups 5, or having ether fixing and support means. In greater detail, the connecting element 2 is composed of a tubular body 6, preferably of metal, on which there are present a plurality of diametrally opposed pairs of threaded seatings 7, arranged laterally, to which are connected the legs and support arms and the support ties for the legs themselves. The choice of an appropriate dimension for the tubular body constituting the element 2 enables a wide variety of sizes of tables to be obtained, while keeping the other supporting elements unchanged. Each leg is composed of an upper, angled element 8, fixed by a screw to one of the threaded seatings 7 of the tubular body 6, and to this there is connected the rectilinear cylindrical element 9 and the support foot 10 for resting on the floor. The latter in turn comprises the angled cylindrical portion 11 and a base disc 12, connected to the angled portion 11. The disc 12 is advantageously connected, by a ball joint and a screw, to a bolt 13, inserted into a corresponding vertical hole of the angled portion 11. The bolt 13 possesses an annular raised shoulder at an asymmetrical position and the associated hole possesses an upper zone of reduced diameter, sufficient for accepting the bolt 13, and a lower zone of larger diameter, adapted for receiving the raised shoulder. In this manner it is possible to secure the support disc 12 to one end of the bolt 13, thus obtaining a certain height from the floor, or the bolt 13 may be mounted in the inverted position, with the support disc 12 secured to its opposite end, thereby obtaining a different height from the floor, for example greater height. The fine adjustment of the height of the support in order to obtain simultaneous bearing on the floor of all four of the base discs, even in the case where the surface on which the table rests is uneven, is obtained by screwing the connecting screw of the disc 12 by different distances into the bolt 13. Instead of the discs 12, rollers or other support devices for resting on the floor may be attached to the bolts 13 of the legs, depending upon the technical and aesthetic requirements for the use of the table. The legs 1 are held in the correct position and orientation, at the intended inclination, by means of inclined ties 14, appropriately constructed of metal rod shaped into an isosceles triangle, with the oblique sides 14a secured, at the ends converging towards the common apex, to the tubular member 6, and secured at the opposite ends, corresponding to the base side 14b, to a pair of legs of the table, as can be better seen from Figures 2 and 3. In greater detail, the ties 14 possess, at the ends of the inclined sides 14a, connectors 15 for securing to the threaded connectors 7 of the tubular member 6 by means of screws or the like; at the ends of the base side 14b there are present the upwardly bent portions 16, adapted to be inserted into corresponding holes of the legs 1 before the connectors 15 are attached to the tubular body 6, thus orientating the tie as indicated in broken line referenced 14' in Fig. 2: the subsequent rotation of the tie into the position for fixing to the relevant connectors 7 therefore brings the ties into a transverse position with respect to the associated holes in the legs 1, so that they can no longer be pulled out and the stiffness and firmness of the structure is assured, with an economical construction and a minimum number of assembly operations. The support arms 3 are composed of intermediate arms 3a and end arms 3b; the intermediate arms 3a are constituted of a pair of opposed arms 17 connected together, supported beneath the member 6 by associated connectors 18, connected by screws to the corresponding connectors 7 of the tubular member 6; the end arms 3b are, in turn, constituted of a pair of arms 19 connected together at an angle, equipped with connectors 20 by which they are secured to the corresponding connectors 7 located at the ends of the tubular member 6; the continuation 21 of the arms 3b, equipped with the associated connector 22, prevents rotation of the arms under the effect of the load applied by the plane 4 and the objects disposed on it. For constructing a circular table, as illustrated in Fig. 4, or a square table or one of fairly restricted length, the connecting element 2 may advantageously be composed of a tubular member 6a which possesses a shaped form, comprising a short rectilinear central portion having a horizontal axis and end portions 6b inclined with oblique axes, along the direction of a pair of mutually opposed logs. To these portions 6b there are connected the rectilinear portions 9 of the legs, while the central portion of the tubular member 6a carries the threaded connectors 7a, to which the corresponding connectors 23 of the support arms 24 for the plane are secured; outside the connectors 23, advantageously secured by the same through screw, the upper cranked members 8 of the second pair of legs are secured. At the ends of the legs 1 are the floor support feet 10, already described. The arms 24 are constructed as a single element, comprising four arms 25, connected together at an angle one from another in opposed pairs, carrying at their ends the support elements 5 for the plane; the arms 24 have basically the shape of two opposed pairs of end arms 3b, having the connectors 20 in common. The legs 1 are therefore connected together by a tie 26, appropriately of metal bar shaped in the form of a square or rhomboid, which ensures the rigidity of the assembled structure. The supporting structure according to this invention is suitable therefore for the construction of tables of many dimensions, simply by replacing the element 2, which adapts to a multiplicity of shapes of working planes; its structure is, moreover, especially firm and rapid to erect. As shown in Fig. 5, the present invention in an alternative form of embodiment provides a structure for tables, desks, work tables and the like, which is composed of two pairs of inclined legs 1, connected together by a connecting element composed of a tubular member 2, equipped with several pairs of diametrally opposite threaded connectors 7, by which the legs 1 and the other supporting elements of the structure are connected together. To the legs 1 and to the tubular member 2, there is connected a working plane 4, which is carried by transverse beams 27, which can be seen in Fig. 6, connected to the legs 1 and to the tubular member 2 respectively by junction clamps 28, 29. In greater detail, as illustrated in Figures 8 and 9, each leg possesses an upper part 8a having a tubular structure of substantially triangular shape, with its apex downwards, to the apex of which there is connected the rectilinear tubular portion 9 of the leg, which carries at its lower end the floor support foot 10, having the bearing disc 12 or roller or similar device, depending upon the requirements, as described above. On the side 30 constituting the base of the triangle formed by the upper part 8a of the legs, there are present the connectors 31, for example four in number, by means of some of which the part 8a is attached to the tubular member 2; the side 30 furthermore possesses a perpendicular stub pipe 32, from which there departs a further cylindrical bifurcation 33, having a horizontal axis. Near the lower apex 34 of the triangle formed by the upper part 8 of the leg, there is also connected a further horizontal cylindrical transverse member 35; as illustrated in Fig. 8, when a pair of parts 8a is secured to the mutually opposed threaded connectors of the tubular body 2, the bifurcations 33 facing each other come into contact above the member 2, while the transverse member 35 joins the parts 8a below the member 2 itself, thereby obtaining, as a consequence of the gripping of the screws 36 or similar fixing means, a rigid structure, with the legs 1 disposed obliquely in a vertical plane transverse to the tubular member 2. The legs 1 may have a symmetrical inclination, for example for tables or desks intended for two-fronted use, or may be of asymmetrical form, for example for tables or desks intended for use from one side only, in which case the two coupled together parts 8a of each pair of legs differ from one another. The parts 8a possess, at the ends of the upper side 30, a pair of slides 37; said slides have, on the upper surface, a groove adapted for seating the lower flange of the beam 27, which appropriately may have a double T-section with unequal flanges, the lower flange having the smaller width. A beam 27 therefore is secured to each of the slides 37 of a pair of parts 8a connected together, by means of the clamps 28, composed basically of a pair of C-shaped elements tightened together, by means of screws 38 or the like, and enclosing between them the lower flange of the beam 27, all as shown in Fig. 9. The beams 27 furthermore may be connected to the tubular member 2 by means of a pair of threaded connectors 7, which are not used for securing the legs 1, by the help of clamps 29, illustrated in detail in Figures 10 and 11. These clamps are composed of a pair of facing elements 39, having shaped end parts 40 possessing recessess adapted for receiving the lower flange of the beam 27, and they can be clamped around this flange by means of screws 41 or the like. In a direction perpendicular to the contact plane between the elements 39 there is also a hole adapted for permitting the fixing of the clamp to one of the connectors 7 by means of a screw 42. The shaped end parts 40 are symmetrically arranged in the upper and lower parts of the clamps 29; the upper parts 40 may be used for fixing the beams 27, as already stated, while the lower parts 40 permit the fixing to the tubular member 2 of suspended objects, such as chests of drawers 43, support planes and the like, positioned beneath the surface of the working plane 4, as shown for example in Figure 12. In the case of a single table, shown in Fig. 5, the plane 4 entirely covers the supporting structure; several tables or desks may, however, be connected together in succession, as indicated in Figure 12; in such a case two tubular members 2, in alignment, are connected to the intermediate legs 1a, one of these tubular members being shown in broken lines in Fig. 6 and referenced 2'; for this purpose the connectors 31 of the elements8a are four in number for each element, thus making possible the rigid connection to a pair of them of a tubular member 2, and the connection of a further tubular member 2', contiguous to the first, to the remaining pair of connectors 31. The stub pipes 32, having a vertical axis, may be connected to rectilinear cylindrical uprights 44; said uprights, as shown in Fig. 12, permit the supporting of an upper bearing plane 45, advantageously of smaller width than the working plane. This plane 45 is supported by horizontal cylindrical elements 46, secured to the uprights 26 by means of cruciform members 47, connected in turn to each other. To the horizontal elements 46 there nay be connected, in the lower part, other members, such as shelves or containers 48, individual lamps, telephone equipment, computers, video units and the like, depending upon the requirements, by the use of connectors 49 disposed on the elements 46 themselves, below and above. By means of the connectors 49 situated in the upper part of the elements 46, the upper plane 45 is attached. Above the plane 45 further objects, such as for example a lamp 50, may be attached to the cruciform member 47. The uprights 44 may also be of telescopic type, incorporating lifting jacks or the like, so as to permit the plane 45 to be brought nearer to the working plane 4, to permit easy access to the objects arranged on the plane 45, and then to raise the plane 45 itself, thereby eliminating possible interference by it when in the lowered position. In the case of several contiguous planes, whether at the working level as the plane 4 or raised as the plane 45, the free space between them, necessary to permit passage of the uprights 44 or of the cruciform members 47, may be closed by make-up filling elements 51, or planes equipped with a shaped edge corresponding to such zones may be provided. With the supporting structure described, whether in the form of embodiment of Figures 1 or 4, or in the form of embodiment of Fig. 5, there may also be associated numerous further working planes, having specific characteristics in relation to the intended use, such as planes that may be raised and orientated by articulated supports, illuminated planes, shaped planes and so on. Numerous variants may be introduced into the realization of this invention, whether in respect of specific forms of particular constructions, or in respect of the aesthetic characteristics, without thereby departing from the scope of the invention as defined by the appended claims.

Claims: Unit-composed support structure for office tables and desks, comprising a cylindrical connecting element having a substantially horizontal axis (2), to which there are connected two or more pairs of inclined legs (1), diverging downwards at least in a vertical plane perpendicular to the axis of the connecting clement, there being connected to said legs and/or said tubular member a plurality of support elements (3, 27) for one or more working planes (4), these support elements projecting horizontally, transversely and/or obliquely to the axis of the connecting element characterized by the fact that on the surface of said connecting element there are present pairs of threaded connectors (7), opposite each other in a horizontal diametral plane, to each of said connectors there may be attached by screw means the legs (1) or stiffening ties (14) or said support arms (3, 27) for the working plane (4) and clamps (29) for fixing transverse members (27) for supporting the working plane (4) and/or elements supported beneath the plane itself, on the upper ends of the legs being present connector members (32) to which there may be connected pairs of uprights (44) carrying an upper plane (45) and/or other devices raised above the working plane, there being also present, at the lower end of the legs, support feet for bearing on the floor (10), adjustable in height. Unit-composed support structure for office tables and desks according to Claim 1, characterized by the fact that the legs (1) are constituted of a rectilinear cylindrical element (9) equipped, in its upper part, with a portion having a substantially triangular shape (8a) with its apex downwards, connected to the rectilinear cylindrical element, the base side (30) of the triangular-shaped potion being capable of being connected, by screw connectors, to the cylindrical connecting element (2), there being also present, near the apex of the triangular-shaped portion, a connector for a transverse member (35), by which two mutually facing triangular portions, connected at the tap to the same tubular member, are connected to each other, in a downwardly diverging position in a plane transverse to the axis of the connecting element. Unit-composed support structure for office tables and desks according to Claim 2, characterized by the fact that, in a median position on the base side of the triangular-shaped portion of each leg, there is an upwardly facing vertical stub pipe (32), equipped with connectors for vertical uprights. Unit-composed support structure for office tables and desks according to Claim 2, characterized by the fact that, at the ends of the base side (30) of the triangular-shaped portion of each leg, there are slides (37) adapted for receiving transverse members (27) for supporting a working plane (4), in cooperation with clamps (28) which can be clamped onto the slides themselves for blocking the transverse members in position. Unit-composed support structure for office tables and desks according to Claim 3, characterized by the fact that two pairs of uprights (44) are present, connected to the vertical stub pipes (32) of two pairs of contiguous legs, to the upper ends of which there are connected load-bearing cruciform pieces (47), secured to the ends of horizontal cylindrical support elements (46), to which elements there may be secured support planes, suspended shelves, lamps, office equipment, lamps or the like. Unit-composed support structure for office tables and desks according to Claim 5, characterized by the fact that the vertical uprights (44) comprise lifting actuators adapted for moving in vertical translatory motion the horizontal support elements and the elements attached to them, between an access position for the elements themselves, near the working plane, and an at-rest position, remote from the working plane. Unit-composed support structure for office tables and desks according to Claim 1, characterized by the fact that said legs are constituted each of an upper, cranked cylindrical element (8), capable of being connected to one of the connectors (7) of the connecting element, to which cranked element there is secured a rectilinear cylindrical element (9), connected in its turn at the end to a floor support foot (10) comprising a cranked element (11) having an end portion with a substantially vertical axis, inside which there is inserted a bolt (13) carrying, at its end, a bearing member (12), which bolt may be inserted in two positions, corresponding to different values of downward projection. Unit-composed support structure for office tables and desks according to Claim 7 characterized by the fact that the bearing member (12) may be composed of an articulated disc, a fixed or pivotal roller, or similar means. Unit-composed support structure for office tables and desks according to Claim 1 and 7 characterized by the fact that said support elements (3) are constituted of pairs of mutually opposed arms (17, 19) connected together at one end and equipped at the top with connectors (18, 20, 23) capable of being coupled to the threaded connectors (7) of the connecting element (2), the arms being equipped furthermore at their ends with members (5) for supporting and securing the working plane (4). Unit-composed support structure for office tables and desks according to Claims 9, characterized by the fact that the end support arms (3b) are connected together at an angle. Unit-composed support structure for office tables and desks according to Claim 1, characterized by the fact that the connecting element (2), in the case of a table having a plane that is circular, square, or of reduced length, is constituted of a tubular member (6a) having a rectilinear median portion with horizontal axis, equipped with a pair of threaded connectors (7), diametrally opposed along a horizontal diameter passing through the centre line, and of downwardly inclined end portions (6b) having an axis inclination equal to that intended for a pair of legs, these end portions being equipped with connector heads adapted for the attachment of the rectilinear cylindrical element (9) of the legs. Unit-composed support structure for office tables and desks according to Claim 11, characterized by the fact that the arms (25) are arranged in a group of four, connected together at one end at an angle one from another, in opposed pairs, equipped above with members (23) for fixing to the threaded connectors (7) of the tubular member (6a), two legs (1) of a pair lying in a plane perpendicular to the pair of legs (1) connected to the inclined portions of the tubular member being capable of being connected to the connectors themselves, externally to said connectors.

Inventors: BORSANI PAOLO, BORSANI, PAOLO
Applicants: TECNO SPA, TECNO S.P.A. MOBILI E FORNITURE PER ARREDAMENTO
Application year: 1987
Main classification: A47B13
IPC codes: A47B87, A47B13, A47B17