CHAIR WITH OSCILLATING BACKREST

• US 20100164263A1
• Filed: 06/05/2008
• Published: 07/01/2010
• Est. Priority Date: 06/06/2007
• Status: Abandoned Application

• Current Assignee: Malenotti S.r.l.
• Original Assignee: Malenotti S.r.l.
• Inventors: Malenotti, Fabio
• Application Number:
  US12/601,095
• Publication Number:
  US 20100164263A1
• Time in Patent Office: Days
• US Class Current: 297/300.100
• CPC Class Codes: A47C 1/03255 with a central column, e.g. rocking office chairs
• CPC Class Codes: A47C 1/03272 with coil springs
• CPC Class Codes: A47C 1/03294 slidingly movable in the base frame, e.g. by rollers

Abstract

A chair with backrest that can be inclined backwards has a seat carried by a support (2b), connected by means of an articulated-parallelogram system (11, 12) to the fixed supporting structure (4, 10) of the chair. The support (17) of the backrest is articulated to the support (2b) of the seat and is operatively connected to said articulated-parallelogram system so that any reclining backwards of the backrest causes a raising and a slight inclination backwards of the seat. The support of the backrest (17) is moreover connected by means of an articulated arm (23) to a sliding support (2a), on which the seat is mounted (2), and is in turn mounted so that it can slide in a longitudinal direction (A) on seat support (2b).

Claims

1. A chair (1) comprising:

a supporting structure (4);

a seat (2), having a seat support (2b), connected to the supporting structure (4, 10) by means of an articulated-parallelogram connection (11, 12), including at least one first arm (11) and at least one second arm (12), each of which is articulated both to the seat support (2b) and to the supporting structure (10) so that the seat can be displaced between a lowered position and a raised position;

a backrest (3) with a backrest support (17), mounted so that it can slide between a substantially upright position and a position reclined backwards, said backrest support (17) being operatively connected to the seat support (2b) in such a way that a displacement of the backrest (3) towards a position reclined backwards causes a displacement of the seat (2) towards a raised position, and vice versa, so that the backrest is recalled towards its upright position by a force depending at least in part upon the weight of the person sitting on the seat (2); and

elastic means (26), operatively set between the supporting structure (10) and said first articulated arm (11) or said second articulated arm (12), or said backrest support (17), which tend to recall the seat (2) towards the lowered position and the backrest (3) towards the upright position,

said chair being characterized in that said seat (2) is carried by a sliding support (2a) mounted so that it can slide on the support of the seat (2b) in a longitudinal direction and in that said sliding support (2a) is operatively connected to said backrest support (17) so that an inclination backwards of the backrest support (17) causes a recession of the sliding support (2a), on which the seat is mounted (2) with respect to the seat support (2b), connected by means of the articulated-parallelogram system to the fixed supporting structure (10).

2. The chair according to claim 1, characterized in that said first articulated arm (11) is prolonged behind its articulation shaft (14) above the fixed supporting structure (10) and terminates with a rear end, connected in an articulated way around a transverse shaft (19, 20) to the backrest support (17), the latter being moreover connected in an articulated way around a transverse shaft (15) to the aforesaid seat support (2b).

3. The chair according to claim 2, characterized in that the part of the aforesaid first articulated arm (11) that is prolonged further, beyond its articulation shaft (14) above the fixed supporting structure (10), carries a transverse pin (21), which is guided in a slot (22) in the fixed supporting structure (10), and presses on a return spring (26) set between said transverse pin (21) and the aforesaid fixed supporting structure (10).

4. The chair according to claim 2, characterized in that the backrest support (17) is moreover connected to the aforesaid sliding support (2a) by means of an articulated arm (23).

5. The chair according to claim 2, characterized in that the rear end of the aforesaid first articulated arm (11) is articulated around a transverse shaft (20) to a shackle element (18), the opposite end of which is articulated around a transverse shaft (19) above the backrest support (17).

6. The chair according to claim 3, characterized in that the rear end of the aforesaid first articulated arm (11) is articulated around a transverse shaft (20) to a shackle element (18), the opposite end of which is articulated around a transverse shaft (19) above the backrest support (17) and in that the aforesaid articulated arm (23) that connects the backrest support (17) to the sliding support (2a) is connected in an articulated way around the aforesaid transverse shaft (20) on the aforesaid shackle element (18).

7. The chair according to claim 1, characterized in that the aforesaid first and second articulated arms (11, 12) are shaped and arranged so that a rotation thereof upwards causes a slight inclination backwards of the seat (2).

8. The chair according to claim 1, characterized in that the part of the fixed supporting structure, to which the first and second articulated arms (11,12) are articulated, is in the form of a box, made in which is at least one guide slot (22) for the aforesaid transverse pin (21), carried by the aforesaid first articulated arm (11), said box containing the aforesaid spring (26) set between the fixed structure and the aforesaid transverse pin (21).

9. The chair according to claim 8, characterized in that there are provided two first articulated arms (11, 12), mounted articulated to the two sides of the aforesaid supporting box (10) and connected by the aforesaid transverse pin (21), which engages two guide slots (22) made in the two sides of said box (10).

10. The chair according to claim 1, characterized in that the backrest support (17) is constituted by an arm having one end connected to the backrest (3) and the opposite end that branches into two arms (17a), the ends of which are articulated, around a common transverse shaft (15), to the aforesaid seat support (2b).

11. The chair according to claim 1, characterized in that associated to the fixed supporting structure (10) is an auxiliary assembly (28) that can be located selectively in a first position, for the normal positioning of the chair, or in a second position, in which it prevents the inclination backwards of the backrest, or in a third position, in which auxiliary elastic means (33) forming part of said auxiliary assembly (28) determine an additional force of reaction that opposes the movement of reclining backwards of the backrest.

12. The chair according to claim 11, characterized in that said auxiliary assembly is mounted so that it can rotate around the axis of a transverse pin (21), rigidly connected to said first articulated arm, that causes deformation of first elastic means (26) associated to the fixed supporting structure of the chair following upon a reclining backwards of the backrest.

13. The chair according to claim 12, characterized in that said auxiliary assembly (28) has different operative positions around the axis of said transverse pin (21) and in that the operative position of the auxiliary assembly (28) is selectable by means of a selector member (35) mounted so that it can rotate around a transverse shaft (36) on the fixed supporting structure of the chair.

14. The chair according to claim 1, characterized in that the aforesaid auxiliary elastic means are constituted by a helical spring (33), which is orientable together with said auxiliary assembly (28) around the axis of said transverse pin (21) and in that in one of said operative positions said spring (33) is set between the fixed supporting structure of the chair and the aforesaid transverse pin (21) so as to react to a movement of inclination backwards of the backrest.