(57) A swinging supporting frame for a chair seat and back, comprising:
- a sustantially horizontal arm (1) for fastening a chair seat;
- a telescopic rod (2) supporting the chair back and being hinged to said arm (1);
- one or more springs (40) acting on said vertical rod to push the chair back forward;
- a spacer (44) inserted between the walls (5) of said horizontal arm; and
- screw means (16) for pressing the walls of said telescopic rod (2) against the walls
(5) of said arm (1) and against said spacer (44) to lock the chair back in position,
wherein said springs (40) are helical springs inserted onto the hinge pin (6) which
is fitted on said arm (1) and said telescopic rod (2), one of the ends of said springs
acting directly against the wall of said arm (1) and the other spring end acting against
said rod, in particular against said spacer (44) inserted on said clamping screw means.
A plurality of friction plates (10) are arranged between said spacer (44) and the
walls of said arm (1), and in order to position and set up said plates (10), said
frame includes a pair of teeth (8, 9) obtained in the walls (5) of said arm by blanking
and drawing.
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