Dynamic seating device

Abstract

The present invention relates to a dynamic seating device with a seat plate ( 1 ), which is mounted by means of a bearing head ( 5 ) on an under-frame with a height-adjustable column ( 14 ) or on a bearing surface. In order to automatically ensure natural movements of the user at the same time with free mobility, according to the invention it is proposed that the seat plate ( 1 ) comprises a recess ( 8 ) arranged in its centre, becoming larger from its top side towards its lower side, that a bush ( 19 ) is passed from below and secured through the recess ( 8 ) in the seat plate ( 1 ), that the bush ( 19 ) rests on the bearing head ( 5 ) of a support pin ( 6 ), wherein the bearing head ( 5 ) is shaped spherically or hemispherically, so that a common rotating and swivelling point arises above the seat plate ( 1 ).

1 . Dynamic seating device with a seat plate ( 1 ), which is mounted by means of a bearing head ( 5 ) on an underframe with a height-adjustable column ( 14 ) or on a bearing surface, characterized in
 that the seat plate ( 1 ) comprises a recess ( 8 ) arranged in its centre, becoming larger from its top side towards its lower side,   that a base plate ( 7 ) with a dome-shaped protuberance is secured in the centre of the seat plate ( 1 ) on its top side,   that the base plate ( 7 ) rests on the bearing head ( 5 ) of a support pin ( 6 ), wherein the bearing head ( 5 ) is shaped hemi-spherically, and   that the support pin ( 6 ) is rigidly connected to the column ( 14 ) or to a plate ( 10 ) forming the bearing surface and protrudes through the recess ( 8 ) through the seat plate ( 1 ),   so that the seat plate ( 1 ) can tilt in all directions and rotate without hindrance.   
     
     
         2 . Dynamic seating device according to  claim 1 , characterized in that the support pin ( 6 ) consists of a metal tube, into whose upper end a bearing head ( 5 ) made from self-lubricating plastic is pressed. 
     
     
         3 . Dynamic seating device according to  claim 1 , characterized in that the support pin ( 6 ) and the bearing head ( 5 ) are integral. 
     
     
         4 . Dynamic seating device according to  claim 2 , characterized in that the radius of the dome-shaped protuberance of the base plate ( 7 ) and the radius of the bearing head ( 5 ) are less than 7 mm. 
     
     
         5 . Dynamic seating device according to  claim 1 , characterized in that a plate ( 13 ) is provided, which is arranged under the seat plate ( 1 ) and is connected to the column ( 14 ) or to the plate ( 10 ) in such a manner that the tilting movement of the seat plate ( 1 ) is restricted. 
     
     
         6 . Dynamic seating device according to  claim 1 , characterized in that a spring washer ( 11 ), pressed onto the support pin ( 6 ), a washer ( 12 ) which is mounted underneath the spring washer ( 11 ) on the support pin ( 6 ) and whose inside diameter is much larger than the support pin ( 6 ) so that this can tilt by at least 20° relative to the washer ( 12 ), and a plate ( 3 ) which is arranged underneath the washer ( 12 ) on the support pin ( 6 ) and rigidly connected to the lower side of the seat plate ( 1 ) and whose central hole is so large that the tilting of the seat plate ( 1 ) is not impaired and the washer ( 12 ) cannot fall through, are provided so that the seat plate ( 1 ) is prevented from lifting off. 
     
     
         7 . Dynamic seating device according to  claim 6 , characterized in that a recess ( 18 ) is provided on the lower side of the seat plate ( 1 ) in such a manner that a horizontal movement of the washer ( 12 ) parallel to the plate ( 3 ) is allowed. 
     
     
         8 . Dynamic seating device according to  claim 6 , characterized in that a spacer is provided between the plate ( 3 ) and the lower side of the seat plate ( 1 ) in such a manner that the movement of the washer ( 12 ) parallel to the plate ( 3 ) is allowed in all directions. 
     
     
         9 . Dynamic seating device according to  claim 5 , characterized in that the column ( 14 ) and the plate ( 13 ) are made of wood, wherein the plate ( 13 ) is firmly glued with the column ( 14 ). 
     
     
         10 . Dynamic seating device according to  claim 1 , characterized in that the surface of the seat plate ( 1 ) is upholstered with flexible material ( 2 ) and lined with a covering material or leather. 
     
     
         11 . Dynamic seating device with a seat plate ( 1 ), which is mounted by means of a bearing head ( 5 ) on an underframe with a height-adjustable column ( 14 ) or on a bearing surface, characterized in
 that a conical bush ( 19 ) which is secured to the lower side of the seat plate ( 1 ), protrudes through a central hole in the seat plate ( 1 ),   that the bush ( 19 ) rests on the bearing head ( 5 ) of a support pin ( 6 ), wherein the bearing head ( 5 ) is shaped spherically, and   that the support pin ( 6 ) is rigidly connected to the column ( 14 ) or to a plate ( 10 ) forming the bearing surface,   so that the seat plate ( 1 ) can tilt in all directions and rotate without hindrance.   
     
     
         12 . Dynamic seating device according to  claim 11 , characterized in that a cap ( 20 ) made from plastic is arranged between the conical bush ( 19 ) and the spherical bearing head ( 5 ) of the support pin ( 6 ). 
     
     
         13 . Dynamic seating device according to  claim 11 , characterized in that a conical bracket ( 21 ) is provided, whose upper opening is smaller than the bearing head ( 5 ) and which is secured together with the bush ( 19 ) to the lower side of the seat plate ( 1 ), in such a manner that when the seat plate ( 1 ) is raised, it is prevented from lifting off. 
     
     
         14 . Dynamic seating device according to  claim 11 , characterized in that a constriction ( 25 ) of the bush ( 19 ) is provided underneath the bearing head ( 5 ), in such a manner that when the seat plate ( 1 ) is raised, it is prevented from lifting off. 
     
     
         15 . Dynamic seating device with a seat plate ( 1 ), which is mounted by means of a bearing head ( 5 ) on an underframe with a height-adjustable column ( 14 ) or on a bearing surface, characterized in
 that the seat plate ( 1 ) comprises a recess ( 8 ) arranged in its centre, becoming larger from its top side towards its lower side,   that a conical metal cap, reduced in diameter from bottom to top, is passed from below through the recess ( 8 ) in the seat plate ( 1 ) and secured, and   that the metal cap rests on the bearing head ( 5 ) of a support pin ( 6 ) and forms the bush ( 19 ), wherein the bearing head ( 5 ) is shaped hemispherically,   so that a common rotating and swivelling point arises above the seat plate ( 1 ).   
     
     
         16 . Dynamic seating device according to  claim 15 , characterized in that the conical bush ( 19 ) is provided at the bottom with an edge ( 25 ), with which the bush ( 19 ) can be secured from below to the seat plate ( 1 ). 
     
     
         17 . Dynamic seating device according to  claim 15 , characterized in that the support pin ( 6 ) in the lower part is shaped cylindrically, in the part adjoining thereto as a truncated cone and in the top part hemispherically and in the centre is provided with a vertical pin ( 23 ), which seats and fixes the bearing head ( 5 ) made from self-lubricating plastic through its hole. 
     
     
         18 . Dynamic seating device according to  claim 15 , characterized in that the conical bush ( 19 ) after being placed on the support pin ( 6 ) is provided with a constriction ( 25 ), which prevents the bush ( 19 ) from being lifted off the support pin ( 6 ). 
     
     
         19 . Dynamic seating device according to  claim 15 , characterized in that a hollow, split truncated cone ( 26 ) fitting into the bush ( 19 ) is provided, whose upper opening is smaller than the diameter of the spherical bearing head ( 5 ) of the support pin ( 6 ) and which is secured together with the edge ( 24 ) of the bush ( 19 ) to the lower side of the seat plate ( 1 ) by means of a washer ( 27 ) in such a manner that after the conical bush ( 19 ) has been placed on the support pin ( 6 ) the seat plate ( 1 ) is prevented from lifting off. 
     
     
         20 . Dynamic seating device according to  claim 15 , characterized in that the lower cylindrical part of the support pin ( 6 ) is provided with a screw thread ( 22 ) and engages into a concentric hole of the column ( 14 ). 
     
     
         21 . Dynamic seating device according to  claim 15 , characterized in that the seat plate ( 1 ) is provided with upholstery ( 2 ).