Actively dynamic seating furniture

Abstract

The invention relates to a spring strut (1) for a pendulating chair (100) comprising a central cylindrical middle shaft (10) which is mounted in an axially displaceable manner on a plurality of guide elements (30) in a shaft cage (20) which can be received in a cylindrical securing sleeve (40) having an inner jacket (41), wherein the guide elements (30) each have a spring body (31) on which resilient support arms (32), each with a clamping contour (K), are provided, and a caster (34) which is mounted rotatably on a shaft (33), wherein the shaft cage (20), for resilient mounting of the spring bodies (31), forms respective recesses (21) in each of which a spring body (31) is mounted with clamping, and the respective spring body (31) bears with clamping with its clamping contour (K) on a mating contour on the shaft cage (20).

1 . A spring strut ( 1 ) for a pendulating chair ( 100 ) comprising a central cylindrical middle shaft ( 10 ) which is mounted in an axially displaceable manner on a plurality of guide elements ( 30 ) in a shaft cage ( 20 ) which can be received in a cylindrical securing sleeve ( 40 ) having an inner jacket ( 41 ), wherein the guide elements ( 30 ) each have a spring body ( 31 ) on which resilient support arms ( 32 ), each with a clamping contour (K), are provided, and a caster ( 34 ) which is mounted rotatably on a shaft ( 33 ), wherein the shaft cage ( 20 ), for resilient mounting of the spring bodies ( 31 ), forms respective recesses ( 21 ) in each of which a spring body ( 31 ) is mounted with clamping, and the respective spring body ( 31 ) bears with clamping with its clamping contour (K) on a mating contour on the shaft cage ( 20 ). 
     
     
         2 . The spring strut ( 1 ) as set forth in  claim 1 , characterized in that the clamping contour (K) is embodied as a retaining lug ( 37 ) projecting from the support arm ( 32 ). 
     
     
         3 . The spring strut ( 1 ) as set forth in  claim 1 , characterized in that the mating contours on the shaft cage ( 20 ) which are provided for the purpose of clamping a support arm ( 32 ) are each instantiated by an edge ( 24 ) at the respective recess, particularly an edge that points inward toward the center. 
     
     
         4 . The spring strut ( 1 ) as set forth in  claim 1 , characterized in that the recesses ( 21 ) for receiving a spring body ( 31 ) each have a substantially rectangular central opening cross section which is adjoined by two laterally diametrically opposed and circumferentially extending recess regions for receiving the support arms, which recess regions in particular have a lower height when viewed in the axial direction in comparison to the height in the region of the central opening cross section. 
     
     
         5 . The spring strut ( 1 ) as set forth in  claim 1 , wherein the central shaft ( 10 ) has a portion ( 11 ) at one end for attachment to or in a pendulum joint. 
     
     
         6 . The spring strut ( 1 ) as set forth in  claim 1 , characterized in that a respective first set of guide elements ( 30 ) is clampingly mounted in receptacles ( 21 ) that are respectively arranged in the circumferential direction in a first (lower) assembly region (M 1 ) of the shaft cage ( 20 ), and a second set of guide elements ( 30 ) is clampingly mounted in additional receptacles ( 21 ) which are spaced apart axially from the first assembly region (M 1 ) and are respectively arranged in the circumferential direction in a second (upper) assembly region (M 2 ). 
     
     
         7 . The spring strut ( 1 ) as set forth in  claim 1 , characterized in that three or four guide elements ( 30 ) are respectively arranged in recesses ( 21 ) that are arranged in the circumferential direction on a common mounting plane of the shaft cage ( 20 ), preferably at positions with an angular interval of 120° or 90°. 
     
     
         8 . The spring strut ( 1 ) as set forth in  claim 1 , characterized in that the recesses ( 21 ) are embodied as openings and the resilient support arms ( 32 ) extend through the openings at least with a portion ( 32   a ). 
     
     
         9 . The spring strut ( 1 ) as set forth in  claim 1 , characterized in that two support arms ( 32 ) on diametrically opposed sides of the spring body ( 31 ) are each integrally connected to the same via an arc portion ( 32   b ) and are arranged within the envelope of the outer jacket of the shaft cage ( 20 ) when the spring body ( 31 ) is in the assembled state. 
     
     
         10 . A pendulating chair with a seat part and a foot part on which a pendulum joint is arranged and a spring strut ( 1 ) which is equipped with a coil spring and designed with the aforedescribed features as set forth in  claim 1 , the spring strut ( 1 ) being attached at one end to the pendulum joint. 
     
     
         11 . A method for assembling a spring strut ( 1 ) as set forth in  claim 1 , comprising at least the following steps:
 a. mounting of the plurality of guide elements ( 30 ) from the outside through the openings ( 21 ) of the shaft cage ( 20 ) such that the casters ( 34 ) of the guide elements ( 30 ) are each aligned toward the intended position of the center shaft, and   b. clampingly locking-together of the guide elements ( 30 ) with their support arms ( 32 ) against the mating contour on the shaft cage ( 20 ).