| 摘要 |
998,568. Seats. SENG CO. April 30, 1964 [May 15, 1963], No. 17989/64. Heading A4J. A tilting chair mechanism comprises a base 19 having spaced walls 21, 22, Fig. 5, with aligned openings 21a, 22a in which are rotatably mounted supporting means 26 consisting of two relatively rotatable parts 27, 28, a torsion bar 37 being slidably and non-rotatably supported in the supporting means 26 by plugs 35, 36 and bushings 31, 33. A tiltable frame member 42 is welded to part 28 of the supporting means and base 19 is secured to the other part 27 by means of a lever 52 -which is adjustable by a screw 56 to prestress the torsion bar 37. |
