Abstract:
Tables and other mobile furniture used in seminars and training classes are joined by ring connector elements mounted for rotation on each item of furniture. Male and female dovetail connection points on the periphery of each ring are engaged to connect items of furniture.

Description:
BACKGROUND OF THE INVENTION 
     This invention relates to a connector for mobile furniture and to a method of connecting pieces of furniture. 
     Mobile furniture, as tables, audio/visual carts, divider panels and the like are widely used in seminars, workshops and training classes. The furniture is typically arranged in a particular configuration for one class or purpose and rearranged for the next. The connector disclosed herein interconnects the furniture in a desired configuration and accommodates many different furniture arrangements. The connector provides for easy and rapid connection and disconnection of furniture pieces. 
     It is known to interconnect modular furniture. However, the range of connected positions is limited and some connectors require tools and are semi-permanent in nature. Representative connectors are shown in: 
     Sapp, U.S. Pat. No. 2,836,475—Key 10, 12, 13, loaded by spring 11 is received in aperture 7 of bracket 6, FIGS. 1 and 2; 
     Heine et al. U.S. Pat. No. 5,144,888—Coupling member 5 engages bars 8; 
     Frascaroli et al. U.S. Pat. No. 4,639,049—Work surfaces are supported on interconnected beams 1; 
     Newhouse et al. U.S. Pat. No. 4,884,513—Brackets (not shown) between desk top 16 and top 300, FIG. 21, col. 17, lines 6-35; tables are joined by wedge-shaped linking elements 309, FIGS. 23-25; and 
     Diffrient U.S. Pat. No. 5,337,657—Connector 120 engages latching strips 118, FIGS. 20-24. 
     BRIEF SUMMARY OF THE INVENTION 
     The connector comprises two connector elements, one for affixation to each of two pieces of furniture. One connector element has an arcuate surface with a plurality of laterally spaced connection points and the other connector element has a connection point to mate with a selected connection point of the one connector element. More particularly, the connection points form a dovetail joint with mating male and female dovetail configurations with the points having rounded edges for ease in engaging the connection points. Preferably, the connector elements are rings with alternate male and female connection points on the ring periphery and are rotatable about the ring axis. These features enable connection of two pieces of furniture with a selected and adjustable orientation. 
     Another feature of the connector is that one of the connector elements is affixed to a piece of furniture for vertical movement to engage the other connector element. 
     A further feature is that the connector elements are affixed to a piece of furniture substantially at the periphery thereof. 
     Still another feature of the connector element is a stop surface adjacent female connector points to position a complimentary male connection point for engagement with the female connection point. 
     Yet another feature is the method of connecting two pieces of furniture in which the connector elements are affixed to each piece of furniture and engaging a selected connection point of one connector element with a connection point of the other connection element. More particularly, each connector element is a ring rotatable in a horizontal plane about a vertical axis and having alternate mating male and female dovetail connection points on the periphery thereof. A male connection point of one connector element ring is engaged with a female connection point of the other connector element ring by vertical movement of one of the connector element rings. 
    
    
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS 
     FIG. 1 is a perspective of the corners of two tables joined with a connector; 
     FIG. 2 is an elevation of the table corners and connector of FIG. 1; 
     FIG. 3 is an elevation as in FIG. 2 with the connector elements separated; 
     FIG. 4 is a vertical section through a connector element and a portion of the table taken along line  4 — 4  of FIG. 2; 
     FIG. 5 is a fragmentary perspective of separated male and female dovetail connection points; 
     FIG. 6 is a plan view of one arrangement of connected tables; 
     FIG. 7 is a perspective of another arrangement of connected tables and a projector stand; 
     FIG. 8 is a perspective of a table connected with a divider panel; and 
     FIG. 9 is a vertical section through a connector element affixed to a divider panel, taken along line  9 — 9  of FIG.  8 . 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Furniture used in seminars and the like is lighter and more mobile than typical office furniture and is sometimes provided with wheels or glides to facilitate movement. The furniture is arranged for a particular seminar session and then may be rearranged for the next session or stored until needed again. The connector disclosed herein provides for interconnection of different items of furniture in a variety of configurations. The furniture items are quickly connected and disconnected without tools. The angular relationship of furniture items can be adjusted while the items are connected. 
     The corners of two connected tables  15 ,  16  are shown in FIGS. 1 and 2. Connector  18  comprises connector elements  19 ,  20 . Each connector element is a ring which has alternate, laterally spaced, dovetail-configured male and female connection points  22 ,  23 , respectively, around the ring periphery. A male connection point  22   a  of ring  20  is received in a female connection point  23   a  of ring  19 , connecting the corners  15 ,  16  of two together. Each ring has eight male and eight female connection points. 
     Connector rings  19 ,  20  are rotatably suspended below the undersides of the table surfaces by cylindrical mount  25 . Cylindrical mount  25  is secured to the underside of the table by a screw  26  threaded to an insert  27  embedded in the table. Ring  19  has a bearing surface  29  which rests on a flange  30  at the lower end of cylindrical mount  25 . 
     The length of cylindrical mount  25  is greater than the thickness of the connector points  22 ,  23  of rings  19 ,  20 , so that one of the rings may be lifted above the other, as shown in FIG. 3, for engagement or disengagement of the connection points. A flange  32  depends from the lower surface of connector rings  19 ,  20 , adjacent and inside female connection points  23 . Flange  32  provides a stop surface to position a complimentary male connection point  22  adjacent and below the female connection point for ease of engagement of the male and female connection points. The edges of the male and female connection points are rounded so that they are guided into alignment upon engagement. In addition, the dimensions of the male connection point  22  are slightly smaller than those of the female connection point  23  so that they slip together easily. The female and male connection points are generally oval. The radii of the ends  22   b  of the male connection point are shorter than the radii of the ends  23   b  of the female connection point. 
     Rings  19  and  20  are preferably molded of a polycarbonate material. Mount  25  is preferably molded of Delrin. Both materials have a low coefficient of friction so that the connection points fit together readily and the rings rotate freely on the mounts. 
     A typical arrangement of connected tables is shown in FIG.  6 . Six rectangular tables  35 - 1 , - 2 , - 3 , - 4 , - 5  and - 6  are connected in two parallel sets of three tables joined lengthwise and flanked by two half round tables  36 - 1  and  36 - 2 . Connector rings  38  are mounted at each corner of the rectangular tables and four connector rings are mounted along the diametric edge of each half round table. Not all rings are identified in the drawings. The rectangular tables are joined at both adjacent corners and the rectangular tables at the ends of each set are joined with the diametric edges of the adjacent half round tables at two points. 
     Another furniture arrangement is illustrated in FIG. 7. A U-shaped table assembly is formed of two sets of three rectangular tables  40 - 1 , - 2 , - 3  and - 4 , - 5 , - 6 . The two sets of rectangular tables are joined at the base of the U by two quarter round table  41 - 1  and  41 - 2  at each end of rectangular base table  42 . Connector rings  38  are mounted at each corner of the rectangular tables  40 ,  42  and the quarter round table  41 . Each table is joined to the adjacent table or tables at two corners. A projector stand  45  is joined with table  40 - 3  by connector rings at  46  and may be adjusted in position with respect to the tables to center the projected image on screen  47 . 
     Two rectangular tables  50 - 1  and  50 - 2  are joined together end-to-end and with mobile screens  51 - 1 ,  51 - 2  in FIG.  8 . The tables are joined by connector rings  38  at each of the adjacent corners. Divider screens  51  each have tubular vertical frame members  52  on either side of panel  53  which may be a fabric or a board material, for example. Connector rings  54  (only one being visible in FIG. 8) are rotatably supported on vertical frame members  52  by a screw  55  threaded in tube  52 , FIG. 9, at the same height as the connector rings  38  at the corners of the tables. 
     Screen  51 - 1  is positioned along the length of table  50 - 1  and connected with the table at both corners. The second table  50 - 2  and screen  51 - 2  are connected lengthwise with table  50 - 1  and screen  51 - 1 , respectively. Each of the four rings  38  and  54  at the table screen junction  58  has two connections. The adjacent corners of tables  50 - 1 ,  50 - 2  are connected with each other and with the adjacent screen frame  52 . The screen frames  52  are connected together and with the adjacent corners of tables  50 - 1  and  50 - 2 .