Importance

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Abstract

A device for adjusting the compression force of the spring in an articulation of a seat of the type equipped with a mobile 'rocket launcher'-type base, from which base there rises a column, adjustable in height, which supports a reciprocally hinged seat plane and a seat back, whereby the seat back supports a headrest and a lumbar support that is also adjustable. The seat plane is attached at the front, by means of two straps, to the corresponding front side of a central support body secured to the top of the adjustable column along the vertical axis. The central support body, at the back, keeps hinged in place the lower ends of the two support uprights of the armrests, equipped with a device for adjusting the height of the chair and a device for locking/releasing the swinging of the seat back and seat, said uprights being further hinged in an intermediate position at the ends of the support frame of the seat back. The frame of the seat back is hinged along the sides and near to the rear part of the seat. Between the central support body and the support frame of the seat back, a helical compression spring is interposed, including, near to one end, a spring support that slides between a cylindrical articulation body and a support rod comprised of a pin on which is pivoted a lever with one end resting against the spring support, while the opposite end, partially located inside a tubular element perpendicular to said spring support, exerts a force on a hemispheric cap on the top of a threaded pin equipped with a knob and sliding inside said tubular element, using a threaded bushed bearing located at the protruding end of the same tubular element.

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First Claim