Abstract:
A table having a stationary supporting device and a movable furniture segment and an operating device for moving the furniture segment is provided. The operating device is swivelably movable about a vertical axis and is operatively connected with the table leaf by at least one control device. The control device converts a swiveling movement of the operating device to a furniture segment movement different from the swiveling movement of the operating device. The table having the control device and operating device is particularly advantageous in for a multiphase movement of the movable furniture segment. A connecting link guide can be used in the control device, particularly implemented in the form of a control cam having a control groove by means of which a furniture-segment-side control pin can be displaced for the movement of the movable furniture segment.

Description:
[0001]     The present application claims priority under 35 U.S.C. § 119 to German Patent Application No. 10 2004 063 580.3, filed Dec. 27, 2004, the entire disclosure of which is herein expressly incorporated by reference.  
       BACKGROUND AND SUMMARY OF THE INVENTION  
       [0002]     The invention relates to a piece of furniture, preferably a table, having a stationary supporting device and a furniture segment, preferably a table leaf, which can be moved horizontally with respect to the supporting device, as well as having an operating device for moving the furniture segment.  
         [0003]     Such pieces of furniture, in the case of which individual furniture segments can be moved horizontally with respect to a stationary supporting device, are known in various forms. The horizontal mobility of the furniture segments permits a more flexible utilization of the piece of furniture in that the furniture segments can usually be moved between a space-saving not-in-use position and a moved-out in-use position depending on the demand. Tables, particularly dining tables, for example, are wide-spread which, depending on the position of at least one movable leaf segment, offer a variable number of spaces.  
         [0004]     A particularly simple construction is provided in the case of a large number of shelf systems and tables, in the case of which an additional leaf can be pulled out when needed. Otherwise, this additional leaf is arranged in a space-saving manner under a main leaf or a shelf in a not-in-use position.  
         [0005]     European Patent Document EP 0 663 164 A1 discloses a table which has a main leaf and two additional leaves and whose additional leaves are in each case constructed to be swivelable about a table leg, so that they can be moved under the main leaf in a not-in-use position and beside the main leaf and flush with the main leaf in an in-use position. The guiding of the additional leaves at the table legs is implemented such that a swiveling of the additional leaves simultaneously results in a vertical position change, so that it is achieved that, in their in-use position, the table leaves have a flush surface with the main leaf and, in their not-in-use position, they are arranged underneath the main leaf.  
         [0006]     For changing between a not-in-use and an in-use position, in the described state of the art, the corresponding furniture segments are usually directly guided manually. The furniture segments are changed into the desired position either by a pulling or a swiveling movement, if necessary, by using an operating device directly connected with the furniture segment. Such changing of the furniture segments from their not-in-use position to their in-use position is considered to be disadvantageous when a complex sequence of movements is required, in which several movement phases with different moving directions follow one another. Such a sequence of movements is difficult to carry out manually.  
         [0007]     It is an object of the invention to provide a piece of furniture with a horizontally movable furniture segment which is advantageous with respect to the state of the art and which is to permit particularly an easy operation for changing between a not-in-use and an in-use position of the furniture segment.  
         [0008]     According to the invention, a piece of furniture, preferably a table, is disclosed which has a stationary supporting device and at least one furniture segment, preferably a table leaf, which can be horizontally moved with respect to the supporting device, as well as an operating device for moving the furniture segment, the operating device being disposed to be swivelably movable about a vertical axis and being operatively connected with the furniture segment by means of a control device, the control device being constructed for converting a swiveling movement of the operating device into a furniture segment movement different from the swiveling movement of the operating device. The furniture segment preferably has an in-use surface extending essentially horizontally, whose position can be changed relative to the supporting device depending on the demand between a first end position, such as a not-in-use position, in which it does not project beyond the overall dimensions of the remaining piece of furniture, and a second end position, such as an in-use position, in which it is accessible for being used. The operating device is preferably further developed such that it is easily accessible for a manual operation. It is—preferably manually—swiveled about the vertical axis, in which case, in a swiveling starting position, the furniture segment is arranged in the first end position and, in swiveling end position, the furniture segment is arranged in the second end position. A swiveling angle between the swiveling starting position and the swiveling end position preferably amounts to less than 360°, particularly between 150° and 180°. The control device is used for converting the swiveling movement of the operating device to the movement of the furniture segment. The movement of the furniture segment may be a translatory as well as a rotatory movement or may be further developed as a combination of a translatory and a rotatory movement. By means of the control device, it is achieved that the swiveling movement of the operating device differs from the furniture segment movement, which is advantageous particularly when the furniture segment movement from the not-in use position into the in-use position is of a complex type, so that a direct movement of the furniture segment or a movement of an operating device which is directly connected with the furniture segment would have presented the problem that an operator would have to carry out the complex furniture segment movement and, depending on the intermediate position of the movable furniture segment, would have to adapt the force applied to the piece of furniture with respect to the direction. In addition, a space-saving furniture segment movement can be achieved without the requirement that the ergonomically advantageous control movement has to adapt itself. In addition to the construction having a movable furniture segment, constructions are also expedient and included in the invention in which several movable furniture segments are provided. These can be movable by separate or joint operating devices and/or control devices. Constructions having two furniture segments which are arranged symmetrically to one another on the piece of furniture, and constructions in which three or more movable furniture segments are provided which can be moved horizontally radially with respect to a joint center are disclosed.  
         [0009]     In a further development of the invention, the control device is constructed for converting the swiveling movement of the operating device to a vertical furniture segment movement. As a result of the swiveling movement of the operating device, the furniture segment is therefore moved horizontally as well as vertically. The vertical movement of the furniture segment is preferably a translatory movement. The horizontal and the vertical movement do not have to take place proportionally to one another. In contrast, it is conceivable and may be expedient that the swiveling movement of the operating device has individual swiveling angle ranges over a total swiveling angle from the swiveling starting position to the swiveling end position, in which swiveling angle ranges the horizontal or the vertical movement of the furniture segment is interrupted. This is, for example, expedient when first a certain horizontal or vertical position is to be reached before a vertical or horizontal movement can be carried out that builds up on the latter, in order to avoid a collision between the movable furniture segment and other parts of the piece of furniture.  
         [0010]     In a further development of the invention, the control device has a first control element with a horizontally extending first control groove and a first control pin engaging in the first control groove. In this case, the control element is preferably a control cam which can be swiveled about the vertical axis and is non-rotatably connected with the operating device, and the first control pin is preferably connected in one piece with the furniture segment. Such a connecting link guide for the horizontal movement of the furniture segment represents a simple and reliable possibility for converting the swiveling movement of the operating element to the movement of the furniture segment. In this context, a control groove is also a recess penetrating the control element. The first control groove is constructed such that, at least in partial areas, it has a changing distance from the vertical axis, so that the first control pin engaging in the first control groove, as a function of its position in the first control groove, has a different distance from the vertical axis. As a result, it is achieved that the swiveling position of the first control element about the vertical axis results in a defined position of the first control pin relative to the vertical axis or, inversely, the position of the first control pin influences the swiveling position of the first control element. Preferably, either the first control groove or the first control pin is fixedly connected with the furniture segment. In this case, it is particularly preferable for the first control pin to be fixedly connected with the furniture segment and for the furniture segment, as a whole, to be guided in a translatory fashion. In such an embodiment, a swiveling movement of the first control groove causes a translatory deflection of the furniture segment. The extent of the deflection of the furniture segment or of the first control pin depends on the further development of the first control groove. The first control groove can interact with a first control bolt which is guided in a straight line and not radially with respect to the vertical axis provides two groove sections, which each extend largely radially, originating from the swiveling starting position of the first control device, the first control pin is guided in the first groove section, until an imaginary connection line between the first control pin and the vertical swiveling axis encloses approximately a right angle with respect to the moving direction of the first control pin. In this position of the first control element, the first control pin changes into the second groove section in that it is guided essentially opposite to the direction in the first groove section radially to the outside. Such a first control groove makes it possible to achieve a wide translatory movement of the furniture segment or of the first control pin by means of a small swiveling movement of the control element. The first control element is preferably non-rotatably connected with the operating device, so that the swiveling angle of the operating device is identical with the swiveling angle of the control element. However, the insertion of a transmission is also expedient by means of which the rate of the swiveling movement of the control element can be increased or reduced with respect to the rate of the swiveling movement of the operating device. Furthermore, an embodiment may also be expedient in which the first control pin is non-rotatably or in one piece is connected with the operating element, and the first control element is connected in one piece with the furniture segment. If, in the case of such an embodiment, the furniture segment is constructed for a purely translatory horizontal movement, by means of a swiveling movement of the operating device and therefore a swiveling movement of the first control pin, the first control groove is translatorily displaced together with the furniture segment.  
         [0011]     In a further development of the invention, the control device has a second control element with a second control groove preferably equidistantly surrounding the vertical axis and a second control pin engaging in the second control groove. This second control element can be a cylinder sleeve swivelable about the vertical axis and non-rotatably connected with the operating device, and the second control pin can be connected in one piece with the supporting device. By means of this second control element, it becomes possible to cause a vertical movement of the furniture segment as a result of the swiveling movement of the operating device. In this further development, a swiveling movement of the second control element as a result of a swiveling movement of the operating device has the result that the control element is translatorily displaced relative to the control pin when the control pin in the course of the swiveling movement of the second control element, reaches an ascending section of the second control groove. The translatory displacement is a function of the swiveling angle between the second control pin and the second control element with the second control groove. It is particularly advantageous for the control groove to extend equidistantly to the vertical axis because a radial movement of the contact point between the second control groove and the second control pin which is connected with an undesirable friction is thereby avoided. The operating device can non-rotatably, particular in one piece, be connected with the second control element. However, it may also be expedient to provide a transmission by which a rate of the swiveling movement of the operating device is increased or reduced with respect to a rate of the swiveling movement of the control element. An embodiment is considered to be particularly preferable in which the second control pin is fixedly connected with the supporting device by means of a column-shaped section of the supporting device and the second control element in the form of a cylinder sleeve with the second control groove is pushed onto this column-shaped section. The outside diameter of the column-shaped section and the inside diameter of the cylinder sleeve are preferably dimensioned such that the cylinder sleeve is non-tiltably guided on the column section but can move translatorily and rotatorily relative to the column section.  
         [0012]     In a further development of the invention, the first control element and the second control element are constructed as a one-piece control element. In this case, it is preferred that this one-piece control element is non-rotatably, particularly in one piece, connected with the operating device. By means of the swiveling movement of the operating device, an identical swiveling movement of the one-piece control element is caused, whereby the control element, as a result of the second control groove and the second control pin, is swiveled as a whole and is vertically moved together with the operating device. The first and the second control groove are equally swiveled along with the one-piece control element and therefore, on the one hand, cause the vertical movement of the control element and, on the other hand, cause the vertical and horizontal movement of the furniture segment operatively connected with the first control groove.  
         [0013]     In a further development of the invention, the control device is constructed such that a swiveling movement of the operating device has swiveling angle ranges in which an essentially, preferably exclusively, horizontal or essentially, preferably exclusively, vertical movement is caused, the first control groove preferably having at least one groove section with a uniform distance to the vertical axis or the second control groove having at least one horizontal groove section. Such swiveling angle ranges, in which no horizontal or no vertical movement of the furniture segment is caused, is expedient because, as a result, complex movement sequences of the furniture segment are permitted for reaching the in-use position of the furniture segment. Thus, it becomes possible, for example, to provide a vertical movement of the furniture segment only starting from a certain swiveling angle of the operating device, at which a horizontal movement of the furniture segment has been concluded so far that no collision with other parts of the piece of furniture has to be feared during a vertical movement of the furniture segment. With respect to the horizontal movement of the furniture segment and of the first control groove, an omission of a horizontal movement of the furniture segment can be achieved by a further development of the groove, in which the groove has a uniform distance from the vertical axis in the corresponding swiveling angle range. As a result, it is achieved that the horizontal position of the first control pin does not change because of a swiveling movement of the operating device in this swiveling range. With respect to the second control groove and the second control pin, an omission of a vertical movement of the furniture segment can be achieved in that the second control groove in the questionable swiveling angle range has a horizontal construction, so that the second control element during a swiveling in this range carries out no translatory movement.  
         [0014]     In a further development of the invention, the control device is constructed such that an operating movement of the operating device from a swiveling starting position into a swiveling end position causes a movement of the furniture segment with at least three movement phases, in which case a swiveling angle range of the operating movement of the operating device is assigned to each of these movement phases and, in a first swiveling angle range, by means of the control device, a horizontal movement of the furniture segment into a first direction is caused; in a second swiveling angle range, no horizontal movement of the furniture segment is caused; and in a third swiveling angle range, a horizontal movement of the furniture segment is caused into a second direction, preferably opposite to the first direction. The control device constructed in this manner achieves a particularly stable positioning of the furniture segment in an in-use position. As a result of the third movement phase, the furniture segment can be pressed against a component of the furniture which is fixed to the supporting device, so that an increased stability of the furniture segment in this in-use position is achieved. It is particularly advantageous for the furniture segment to be vertically moved between the first and the third horizontal movement phase in order to reach the range of a stationary stop on the piece of furniture which is fixed to the supporting device, against which stop, it is pulled with the second movement phase. A further development of the control device for a third movement phase is considered to be particularly advantageous which causes a movement which exceeds the movement required for the pure contact because, as a result, a bracing of the furniture segment is achieved by which the stability is increased and the tolerances which are unavoidable in the control device are compensated.  
         [0015]     In a further development of the invention, the control device is constructed such that, in the first and third swiveling angle range, no vertical movement of the furniture segment and, in the second swiveling angle range, a vertical movement, in the upward direction, is caused by the control device. An overall movement of the furniture segment is thereby achieved during which, after reaching a maximal horizontal deflection, the furniture segment is vertically moved in order to arrive in the vertical area of a stop fixed to the supporting device. The control device is constructed such that, when the end of this swiveling angle range has been reached, the furniture segment in the vertical direction is in the desired in-use position and, by means of the horizontal displacement toward a stop fixed to the piece of furniture is in contact with the stop and can thereby be stabilized.  
         [0016]     In a further development of the invention, the control device is constructed such that, as a result of a swiveling movement of the operating device in a swiveling angle range starting from the swiveling starting position, a lowering of the furniture segment is caused. Such a lowering movement permits the arranging of the furniture segment in a not-in-use position which is particularly protected from being seen. The protection from being seen can be achieved, for example, by means of a shielding apron fixed to the supporting device in the area of the not-in use position. By means of the lowering, the furniture segment is displaced to a level which permits a horizontal displacement by passing through under this protective apron. Such a protection against being seen and a correspondingly adapted control device are considered to be particularly advantageous for tables. In the case of tables, a section for a shielding from view can be provided which, for example, extends around a leaf fixed to the supporting device and from the outer edge of the leaf downward.  
         [0017]     In a further development of the invention, the operating device is constructed to be radially displaceable with respect to the vertical axis. Such a radially displaceable operating device is expedient for a simple operation. When the furniture segment is to be moved from one position to another, for example, from a not-in-use position into an in-use position, the operating device can be radially pulled out, so that the swiveling lever becomes as large as possible and, as a result, the swiveling becomes as easy as possible. In addition, the radial displacement of the operating device toward the outside creates a better accessibility of the operating device. After the conclusion of the swiveling movement of the operating device, the latter can be displaced again radially toward the inside, so that it hinders neither the accessibility to the piece of furniture or to the furniture segment, nor interferes with the aesthetic appearance of the piece of furniture.  
         [0018]     In a further development of the invention, the supporting device has at least one recess adapted to the operating device, and the operating device is constructed so that it can be slid into this recess, in a swiveling end position and/or a swiveling starting position.  
         [0019]     Together with the operating device, such a recess in the supporting device is used as a locking device. When the operating device is slid into the recess, a swiveling movement of the operating device is no longer possible. This locks the movable furniture segment with respect to its horizontal and vertical position. The recess can be arranged in the area of the operating device in the swiveling starting position or the swiveling end position, and also at different intermediate positions between the swiveling starting position and the swiveling end position. As a result, it is achieved that the furniture segment can be locked in different positions, so that, for example, depending on the requirement, the furniture segment can be moved different distances vertically and horizontally and can be locked in the respectively desired position.  
         [0020]     In a further development of the invention, the piece of furniture has two horizontally movable furniture segments, such as table leaves, which are operatively connected with the operating device by means of the control device. The control device can be constructed for the symmetrical movement of both furniture segments in reaction to the swiveling movement of the operating device.  
         [0021]     Such a symmetrical arrangement of movable furniture segments is, on the one hand, expedient for aesthetic reasons and, on the other hand, is mechanically expedient because the center of gravity of such a piece of furniture does not change as a result of the movement of the furniture segments. This is an advantage when designing the supporting device.  
         [0022]     A piece of furniture is particularly preferable which has a joint control element for both furniture segments, such as a control cam with two congruent first control grooves arranged on opposite sides of the vertical axis.  
         [0023]     In a further development of the invention, the control device is constructed such that, in the swiveling starting position of the operating device, the movable furniture segment is arranged completely under a horizontally stationary furniture segment of the piece of furniture, and that, in the swiveling end position of the operating device, the movable furniture segment is arranged at least partially not under the horizontally stationary furniture segment. Such a piece of furniture is characterized by a low space requirement when the furniture segment is not in use.  
         [0024]     In a further development of the invention, the control device is constructed such that, in the swiveling end position, an upward pointing surface of the movable furniture segment is arranged to be in an alignment with an upward pointing surface of the horizontally stationary furniture segment.  
         [0025]     This results in a uniform surface, for example, a table top, which can be utilized particularly advantageously. On the one hand, such a swiveling end position can be reached in that, in the course of the swiveling movement of the operating device, the movable furniture segment is successively moved horizontally and vertically, and can, on the other hand, be reached in that the movable furniture segment is moved horizontally toward the outside, and the horizontally stationary furniture segment is subsequently vertically lowered.  
         [0026]     In a further development of the invention, the control device is constructed for the horizontal movement of a vertically stationary and for the vertical movement of a horizontally stationary furniture segment, in the swiveling end position, the horizontally stationary furniture segment being lowered to the level of the horizontally movable furniture segment.  
         [0027]     In a further development of the invention, the supporting device has a supporting column, which, at least in sections, has an outside diameter adapted to an inside diameter of the cylinder sleeve.  
         [0028]     These and additional characteristics of preferred further developments of the invention are indicated, in addition to the claims, also in the specification and the drawings. The individual characteristics can in each case be implemented separately or combined in the form of subcombinations in an embodiment of the invention and in other fields and can represent advantageous constructions, which can be protected separately and for which protection is claimed here. 
     
    
     BRIEF DESCRIPTION OF THE DRAWING FIGURES  
       [0029]     Embodiments of the invention are schematically illustrated in the drawings and will be explained in detail in the following.  
         [0030]      FIGS. 1   a  to  1   d  are perspective views of a table according to the invention diagonally from below in four different move-out stages of additional leaves; and  
         [0031]      FIGS. 2   a  to  2   h  are schematic views of the method of operation of the connecting link guide for the horizontal movement of the additional leaves. 
     
    
     DETAILED DESCRIPTION  
       [0032]      FIGS. 1   a  to  1   d  illustrate a table according to the invention having a supporting device  10 , a main leaf  12  and two additional leaves  14   a ,  14   b . The supporting device  10  has a base  16  with which a supporting column  18  is connected in one piece. In a manner not shown in  FIGS. 1   a  to  1   d , the main leaf  12  is permanently joined with the supporting column  18 . Underneath the main leaf  12 , a horizontal-guidance system  20  is provided which has a base plate  22  and two guide rails  24   a  and  24   b  fixedly connected with the base plate and arranged parallel on both sides of a vertical center axis  42 . The guide rails  24   a  and  24   b  are used for the horizontal guidance of the additional leaves  14   a  and  14   b . For this purpose, the additional leaf  14   b  has two guiding strips  26  fixedly connected with the additional leaf  14   b , which, in a known manner, are guided on the sides of the guide rails  24   a  and  24   b  pointing to the outside and, as a result, permit a horizontal movement of the additional leaf  14   b  in the direction indicated by the arrow  30   b . In a similar fashion, the additional leaf  14   a  has two guiding strips  28  which are fixedly connected with the additional leaf  14   a  and which are guided on the inside rails of the guide rails  24   a  and  24   b . This guidance permits a translatory movement of the additional leaf  14   a  in the direction indicated by the arrow  30   a . The entire guidance system  20  as well as the additional leaves  14   a ,  14   b  are arranged in a vertically movable fashion and rest on a control element  32 . The control element  32  comprises a control cam  34 , a cylinder sleeve  36 , which is connected in one piece with the control cam  34 , as well as an operating device  38  which is constructed as a metal rod and is displaceably guided in two guide bushes  40  mounted on the underside of the control cam  34 . Swivelably about the vertical center axis  42  and translatorily movably in the direction of the center axis  42 , the control element  32  is pushed onto the supporting column  18 . The supporting column  18  is operatively connected with the control element  32  by means of a connecting link guide  44 , one part of this connecting link guide  44  being a control recess  46  provided in the cylinder sleeve  36 , and the other part being a control pin  48  radially extending from the supporting column  18 . In a manner not shown, a ball bearing control roller is provided on the control pin  48 .  
         [0033]     The control element  32  is operatively connected with the guiding system  20  and the additional leaves  14   a ,  14   b  by way of a second connecting link guide  50 . On the part of the control cam  34 , the connecting link guide  50  has two control recesses  52  and, on the part of the guiding system  20  or of the additional leaves  14   a ,  14   b , has two control pins  54   a ,  54   b . The first control pin  54   a  is constructed in one piece with one of the guiding strips  28  of the additional leaf  14   a , and the second control pin  54   b  is constructed in one piece with one of the guiding strips  26  of the additional leaf  14   b . In order to achieve an identical spacing of both control pins  54   a ,  54   b  from the center axis  42 , although the control pin  54   a  is assigned to the additional leaf  14  with the interior guiding strips  28  and the control pin  54   b  of the additional leaf  14   b  is assigned to the exterior guiding strips  26 , an auxiliary arm is fastened to one of the guiding strips  28  and reaches over one guiding strip  26  and on whose end the control pin  54   a  is provided.  
         [0034]     In a manner not visible in the drawing, a total of four holes are provided in the supporting column  18 , two holes respectively being situated opposite one another in the wall of the supporting column  18 . The first pair of holes is arranged such that, in a swiveling starting position illustrated in  FIG. 1   a , the operating rod  38  can be pushed through the supporting column  18 . The second pair of holes is arranged such that, in a swiveling end position illustrated in  FIG. 1   d , the operating rod  38  can be pushed through the supporting column  18 .  
         [0035]      FIG. 1   a  illustrates the table with the moved-in additional leaves  14   a ,  14   b . In this condition, the additional leaves  14   a ,  14   b  are situated in the not-in-use position underneath the table and the useful table surface is thereby limited to the surface of the main leaf  12 . The control element  32  and the operating rod  38  are in their swiveling starting position, in which case the control pin  48  of the supporting column  18  is arranged at one end  46   a  of the control recess  46 , and the control pins  54   a ,  54   b  of the guiding strips  26 ,  28  are each arranged at one end  52   a  of the respective control recess  52  of the control cam  34 . In this not-in-use position, the operating rod  38  is pushed through the holes provided for this purpose in the supporting column  18 , so that an accidental swiveling of the operating rod  38  and of the control element  32  cannot take place.  
         [0036]      FIG. 1   b  shows a second stage of the moving-out of the additional leaves  14   a ,  14   b . This moving-out is achieved by a manual operation of the operating rod  38 . For this purpose, it is pulled out of its not-in-use position illustrated in  FIG. 1   a , so that it no longer engages in the supporting column  18  and the locking connected therewith is correspondingly released. With respect to the starting position, the operating rod  38  as well as the control element  32  are swiveled by approximately 45° about the vertical center axis  42 . The consequence of this swiveling is, on the one hand, that the control pin  48  of the supporting column  18  is moved in the control recess  48 . Because of the horizontal alignment of the guiding recess  46  in the area  46   b , this results in no vertical position change of the control element  32 . The second consequence of the swiveling of the operating rod  38  and of the control element  32  is that the control pins  54   a ,  54   b  of the guiding strips  26 ,  28  are guided toward the leaf edge of the main leaf  12 , whereby the leaves  14   a ,  14   b  are also displaced toward the outside. In the condition illustrated in  FIG. 1   b , the control pins  54   a ,  54   b  have each already been guided along a section  52   b  of the control recesses  52  of the control cam  34 . The end of this recess section  52   b  oriented essentially radially to the vertical center axis  42  is followed by a short circular-arc-shaped recess section  52  which has the result that, in the course of the swiveling movement of the operating rod  38  and of the control element  32  in a small angular range of less than 10°, no further displacement of the additional leaves  14   a ,  14   b  takes place. In the condition illustrated in  FIG. 1   b , the control pins  54   a ,  54   b  have slid into a third recess section  52   d  also oriented largely radially with respect to the center axis  42 , which recess section  52   d , in the course of the continued swiveling of the operating rod  38  and of the control element  32 , causes the further moving-out of the additional leaves  14   a ,  14   b , in which case the control pins  54   a ,  54   b  move away again from the center axis  42 .  
         [0037]     In the stage illustrated in  FIG. 1   c , the maximal deflection of the additional leaves  14   a ,  14   b  has been reached. By means of the further swiveling of the operating rod  38  and of the control element  32 , the control pins  54   a ,  54   b  were pressed as a result of the recess section  52   b  into this condition of maximal deflection. The recess section  52   d  is followed by a recess section  52   e  which, relative to the vertical center axis  42 , has a circular-arc-shaped construction. A swiveling of the control element  32  in the angular range in which the control pins  54   a ,  54   b  are in this recess section  52   e , therefore has no effect on the horizontal deflection of the additional leaves  14   a ,  14   b . In the condition illustrated in  FIG. 1   c , the control pin  48  of the supporting column  18  has reached an ascending section  46   c  of the control recess  46 . A swiveling of the control element  32  has the effect in this area that the entire control element  32  is lifted together with the operating rod  38  and the guidance system  20  as well as the guiding strips  26 ,  28  and the additional leaves  14   a ,  14   b . In this case, the ascending section  46   c  is dimensioned such that the height difference between the horizontal section  46   b  and a second horizontal section  46   d  following the ascending section  46   c  corresponds to the height difference of the additional leaves  14   a ,  14   b  between the not-in-use condition and the in-use condition. In the stage which is illustrated in  FIG. 1   c , the additional leaves  14   a ,  14   b  are therefore just lifted to the level of the main leaf  12 .  
         [0038]      FIG. 1   d  illustrates the functional condition of the table with completely moved-out additional leaves  14   a ,  14   b , the leaves  14   a ,  14   b  forming a plane surface together with the main leaf  12 . In this condition, the control pin  48  of the supporting column  18  is arranged at the end  46   e  of the second horizontal section  46   d . By means of the position in the second horizontal section  46   d , it is achieved that the weight loading the cylinder sleeve  36  generates no torque about the vertical center axis  42  upon the cylinder sleeve, as occurs in the ascending section  46   c . The control pins  54   a ,  54   b  are each situated at the end  52   h  of the control recesses  52 . As a result of the swiveling movement of the operating rod  38  and of the control element  32  between the conditions illustrated in  FIG. 1   c  and in  FIG. 1   d , the control pins  54   a ,  54   b  in a recess section  52   f , which is constructed in the shape of a spiral section, were moved closer to the vertical axis  52 , so that the additional leaves  14   a ,  14   b  are pressed closer against the main leaf  12 . The respectively last recess section  52   g  of the recesses  52  has a circular-arc-shaped construction again relative to the vertical center axis  42 , so that the pins  54   a ,  54   b  do not exercise a torque by means of the recess sections  52   f  about the vertical center axis  42  upon the control cam  34 . For locking the control element  38  in the functional condition illustrated in  FIG. 1   d , the operating rod  38  is pushed through the holes in the supporting column  18  not visible in the figure, so that an accidental swiveling of the operating rod  38  and of the control element  32  is prevented.  
         [0039]      FIGS. 2   a  to  2   h  have the purpose of illustrating the horizontal movement of the additional leaves  14   a ,  14   b  and the interaction of the swivelably disposed control cam  32  and the control recesses  52  with the control pins  54   a ,  54   b . For reasons of simplification, only one respectively of the guiding strips  26  of the additional leaf  14   b  with the control pin  54   b  as well as the control cam  34  with the control recess  52  is illustrated in the drawings.  
         [0040]      FIG. 2   a  shows the starting position before the moving-out of the additional leaf  14   b  by a swiveling movement of the control cam  34 . In this condition, the control pin  54   b  is situated at the end  52   a  of the control recess  52 .  
         [0041]      FIG. 2   b  shows a condition after the swiveling of the control cam  34  by approximately 10°. The control pin  54   b  was driven forward within a first recess section  54   b  which is oriented essentially radially with respect to the vertical center axis  42 , in which case the guiding strip  26  was displaced in the direction of its orientation. The starting position  26   a  is illustrated by a broken line in order to permit an easier recognition of the movement of the guiding strip  26 .  
         [0042]     In the stage illustrated in  FIG. 2   c , the control cam  34  is swiveled approximately 25° with respect to its starting position illustrated in  FIG. 2   a . In the meantime, the control pin  54   b  has traversed the recess section  52   c  of the recess  52 , this recess section  52   c  having a circular-arc shape relative to the vertical center axis  42 . This has the result that no further movement of the guiding strip  26  was caused in a swiveling angle range between approximately 20 E and approximately 25°.  
         [0043]     In the condition illustrated in  FIG. 2   d , the control pin  54   b  is situated in the third section  52   d  of the control recess  52 . This third section  52  is, in turn, oriented essentially radially with respect to the vertical center axis  42  and, because of the swiveling movement of the control cam  34 , causes a further displacement of the guiding strip  26 .  
         [0044]      FIG. 2   e  shows a stage in which the control cam  34  is swiveled approximately 85° with respect to its starting position. The control pin  54  has reached the fourth section  52   e  of the control recess  52 . This section again has a circular-arc-shaped construction. In the stage illustrated in  FIG. 2   e , the guiding strip  26  is in the condition of its maximal displacement.  
         [0045]     In condition  2   f , the control cam  34  is swiveled by approximately 150° with respect to its starting position. In comparison to the condition illustrated in  FIG. 2   e , the position of the control pin  54   b  and of the guiding strip  26  is unchanged because the circular-arc-shaped recess section  52   e  forces no change of the position of the control pin  54   b . In this angular range between 85°, illustrated in  FIG. 2   e , and  150 E illustrated in  FIG. 2   f , the vertical lifting of the additional leaves  14   a ,  14   b  takes place by the control recess  46  in the cylinder sleeve  36  and the control pin  48  of the supporting column  18 . When the stage illustrated in  FIG. 2   f  with respect to the swiveling angle is reached, the additional leaves  14   a ,  14   b  are at a level with the main leaf  12  and form a common plane surface.  
         [0046]     In the condition illustrated in  FIG. 2   g , the control cam  34  is swiveled approximately 155° with respect to the starting position. The control pin  54   b  is in the second to the last section  52   f  of the control recess  52 . This section has the shape of a spiral section so that the distance from the front end of section  52   f  to the vertical center axis  42  is greater than the distance from the back end of section  52   f . This has the result the control pin  54   b  is moved by a small distance against the previous moving direction and the guiding strip  26  moves together with it in the same direction. As a result, it is achieved that, while the height remains the same, the additional leaves  12  are pressed against the main leaf  12 . In the process, a bracing of all tolerances provided in the mechanism of the table occurs, so that the additional leaves  14   a ,  14   b  together with the main leaf  12  form a stable and inherently rigid overall top. For illustrating this movement taking place against the previous moving direction, the position  26 ′ of the guiding strip  26  is illustrated by a dotted line in its position of maximal deflection.  
         [0047]     In the condition illustrated in  FIG. 2   g , the end of the swiveling movement has been reached. The control pin  54   b  is at the end  52   h  of the control recess  52 . In the area between the end  52   h  and the second to the last recess section  52   f , a last recess section  52   g  is provided which, in turn, relative to the vertical center axis  42 , has a circular-arc-shaped dimension. As a result, it is achieved that a force acting in the direction of the arrow  62  from the control cam  34  upon the control pin  54   b  does not result in a torque acting upon the control cam  34  which, when a locking is absent, would result in a drifting-apart of the additional leaves  14   a ,  14   b  away from the main leaf.  
         [0048]     The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.