CHAIR MECHANISM

Abstract: Chair mount for a spring activated tilting movement between a seat and a turning column of a chair, being connected respectively with the seat mount (2) and the frame (3) of the mechanism, where a rectilinear torsion spring (1) preferably having a square cross section, in each end being secured to pipes (5, 6) surrounding the spring (1), where the second pipe (5) extending from one end of the spring (1) at least to beyond the middle of the spring (1), at which point the second pipe (5) is connected with the frame (3) which again is connected with the turning column (4) of the chair, the first pipe (6) extending from the other end of the spring (1) to near the second pipe (5) and here being connected with one end of a stop arm (7) of which the other end with a prestress is abutting against the seat mount of the chair by intersection of an adjustable bolt, and further that the seat mount (2) being turnably journalled around the second pipe (5).

Description: Chair Mechanism The present invention is related to a chair mechanism for biased tilting movement between the seat and the base column, connected respectively with the seat portion and the frame of the chair mechanism. Throughout the passed years tilting mechanisms or chair mechanisms comprising torsion springs, have been used extensibly especially for office chairs and such and also have proved to be satisfactory with their small dimensions, simplicity in adjust¬ ment and good reliability. Partly this is achieved by a recti¬ linear torsion spring, usually clamped in both ends which then can be turned in relation to each other and the spring being surrounded by pipes. With the present invention is found that this structure can be substantially simplified and especially the same advantageous are achieved by use of only one pipe, as defined by the features stated in the claim. The drawing discloses in Fig. 1 schematically the chair mechanism according to the present invention in a top view, Fig. 2 discloses a front view, Fig. 3 discloses a ground view and Fig. 4 discloses a side view of the chair mechanism according to the present invention. A torsion spring 1 having a square cross section, is arranged within and at both ends secured to a pipe, respectively 5 and 6. One of the pipes 6 is connected with a stop arm 7 abutting against a seat mount 2. By a means of a suitable grip the spring pressure of the torsion spring can be adjusted between the mount 2 and the arm 7. The other pipe 5 is directly connected with the frame 3 mounted to the column 4 of the chair. The seat mount 2 is arranged to be journalled around the other pipe 5. The force path is according to the above described details, to be found from the seat mount 2, through the arm 7 and to the pipe 6, further from hear through the torsion spring 1 to the other pipe 5 and to the column or fundament of the chair through the frame 3.

Claims: Patent Claim 5 Chair mount for a spring activated tilting moveme between a seat and a turning column of a chair, being connect respectively with the seat mount (2) and the frame (3) of t mechanism, where a rectilinear torsion spring (1) preferab having a square cross section, in each end being secured to pip o (5, 6) surrounding the spring (1), CHARACTERIZED IN the seco pipe (5) extending from one end of the spring (1) at least t beyond the middle of the spring (1), at which point the seco pipe (5) is connected with the frame (3) which again is connecte with the turning column (4) of the chair, the first pipe (6 s extending from the other end of the spring (1) to near the secon pipe (5) and here being connected with one end of a stop arm (7 of which the other end with a prestress is abutting against th seat mount of the chair by intersection of an adjustable bolt and further that the seat mount (2) being turnably journalle o around the second pipe (5).

Inventors: LIE TORE, LIE, TORE
Applicants: RING MEKANIKK AS, RING MEKANIKK A.S.
Application year: 1992
Main classification: A47C9
IPC codes: A47C3