Seating furniture

Claim 2

An article of seating furniture comprising a seat, a back rest, a back rest support connected to said back rest and pivotably connected to said seat, a base connected to said seat, and a single adjusting lever, said article of seating furniture further comprising: seat adjust means connected to said seat and said base for adjusting the height of said seat; back seat tilt means connected to said back rest support for tilting said back rest backward and forward; and back rest height adjust means connected to said back rest for adjusting the height thereof, wherein said seat adjust means, said back rest tilt means and said back rest height adjust means are all controlled by said single lever.

Claim 3

An article of seating furniture in accordance with claim 1, wherein said seat adjust means includes a first pneumatic spring incorporated in said base and connected to said seat, said first pneumatic spring having a locking device operable by a release pin and wherein said release pin is in contact with said lever whereby a swing of said lever in a first direction will depress said release pin and release the locking device of said first pneumatic spring; wherein said back rest tilt means includes a second pneumatic spring connected at one end to the bottom of the seat and at the other end to said back rest support, said second pneumatic spring having a locking device operable by a release pin, and wherein said release pin is in contact with said lever whereby a swing of said lever in a second direction will depress said release pin and release tHe locking device of said second pneumatic spring; and wherein said back rest height adjust means includes a rotatable threaded rod vertically mounted in said back rest support, a threaded nut non-rotatably mounted on said threaded rod and connected to said back rest, and a cable fastened at one end to said threaded rod and at the other end to said lever whereby rotation of said lever about the longitudinal axis thereof causes rotation of said threaded rod and therefor vertical translation of said threaded nut and back rest therealong.

Claim 4

An article of seating furniture in accordance with claim 2 wherein each of said first and second pneumatic springs comprises: a tubular casing containing a fluid filling; a piston axially movable in said tubular casing mounted on a piston rod emerging at one end of said casing through a seal therein, said piston rod being immovably anchored on said base or said back rest support; said locking device capable of locking said piston in an adjusted position blocking an overflow opening for said filling and having said release pin emerging from the end of said casing adjacent said lever, said pin being capable of opening said overflow opening and of connecting the casing space ahead of said piston to the casing space behind said piston via a by-pass chamber.

Claim 5

An article of seating furniture in accordance with claim 1 wherein said lever includes a spherical bearing mounted thereon and said seat includes a holder fastened therebeneath and a bearing mount fastened to said holder, and wherein said spherical bearing is mounted in said bearing mount.

Claim 6

An article of seating furniture in accordance with claim 4 wherein said holder includes recesses therein through which said lever passes, said recesses forming guides for the motion of said lever in said first and second directions.

Claim 7

An article of seating furniture in accordance with claim 2 wherein said lever includes a spherical bearing mounted thereon and said seat includes a holder fastened therebeneath and a bearing mount fastened to said holder, and wherein said spherical bearing is mounted in said bearing mount.

Claim 8

An article of seating furniture in accordance with claim 6 wherein said back rest tilt means further includes a sliding block mounted in said holder perpendicular to the direction of said lever, said sliding block having a projection that contacts the release pin of said second pneumatic spring, wherein one end of said lever passes through said sliding block allowing displacement of said block upon swinging said lever in said second direction which in turn depresses said release pin and allows movement of said back rest.