TH45003A - A chair with a seat and back that slant smoothly. - Google Patents

Abstract

DC60 (11/07/43) A chair with a synchronized tilting seat and backrest consisting of a base structure (14), a seat support structure (18) rotatably attached to the base structure (14) around the first transverse axis (22), a backrest support structure (20) rotatably attached to the base structure (14) around a second axis (24) parallel to the first axis, articulated pathways (48) capable of causing synchronized tilting of the seat and backrest to each other, elastic pathways (32) pushing the seat (12) and backrest (16) forward tilted and resisting the backward tilt of the seat (12) and backrest (16), pathways (54, 68') for inhibiting the forward tilting of the seat and backrest in the normal sitting position. And in the selectable forward tilt position, and pathways (56, 68") for securing the seat (12) and backrest (16) in place in at least one operating position, a pair of tilt restraints (54, 56) fixed to the seat support structure (8) or the backrest support structure (20) are provided and work in conjunction with the corresponding securing parts (68', 68") which slide freely with each other in a direction parallel to the tilt axis (24) of such restraints (54, 56) between the non-operating and operating positions. A chair with a synchronized tilting seat and backrest consists of a base structure (14), a seat support structure (18) swivel-fastened to the base structure (14) around the first transverse axis (22), a backrest support structure (20) swivel-fastened to the base structure (14) around a second axis (24) parallel to the first axis, and articulating pathways (48) capable of causing synchronized tilting of the seat. And the backrests are mutually supportive. A flexible pathway (32) pushes the seat (12) and backrest (16) forward and resists the backward tilting of the seat (12) and backrest (16). A pathway (54,68') inhibits the forward tilting of the seat and backrest in the normal seated position and in the selective forward tilted position, and a pathway (56,68") holds the seat (12) and backrest (16) in place in at least one operational position. A pair of tilt restraints (54,56) fixed to the seat support structure (8) or the backrest support structure (20) are provided and work in conjunction with the corresponding fixing elements (68',68") which slide freely with each other in a direction parallel to the tilt axis (24) of such restraints (54,56) between the non-operating and operational positions.

Claims (7)

1. A chair with a seat and backrest that tilt in a synchronized manner consists of a base structure (14), a seat support structure (18) that is swivel-fastened to the base structure (14) around the first transverse axis (22), a backrest support structure (20) that is swivel-fastened to the base structure (14) to the second axis (24) parallel to the first axis, articulation pathways (48) that allow for synchronized tilting of the seat and backrest, elastic pathways (32) that press the seat (12) and backrest (16) to an forward tilt position and that resist the backward tilt of the seat (12) and backrest (16), pathways (54,68) for inhibiting the forward tilting of the seat and backrest in the normal sitting position and in a selective forward tilt position, and pathways (56,68) for securing the seat (12) and backrest (16) in place in at least one operating position. Its unique characteristic is that it consists of a pair of tilt restraints (54,56) fixed to the seat support structure (18) or backrest support structure (20) and works in conjunction with a corresponding fixing element (68', 68") supported by the base structure (14) which can slide freely to each other in a direction parallel to the tilt axis (24) of the aforementioned restraints (54,56) between the non-operating and operating positions. 2. The chair under claim 1 is characterized by the fact that one of the such tilt restraint units (54) works in conjunction with a pair of end restraint units (102,104) fixed to the base structure (14) to determine the forward tilt of the seat and backrest and the maximum backward tilt, respectively. The first fixed unit (68') works in conjunction with such first restraint unit (54) to determine the cessation of movement corresponding to the normal sitting position of the seat and backrest. 3. The chair under claim 1 is characterized that the second tilt restraint (56) has a number of holes (60) arranged at equal distances from the tilt axis (24) of the second restraint (56). Such holes (60) are arranged in a manner that moves along a circular path, and a second holding element (68") is provided to hold one of the holes (60). 4. The chair under claim 1 is characterized by the following: it consists of a pair of control devices (70,'70") which can be operated manually and which can move the corresponding fixed parts (68',68") between an operating position in which the fixed parts (68',68") do not act on the corresponding tilt restraint (54,56) and an operating position in which the fixed parts (68',68") are elastically compressed to a position in which they grip the corresponding tilt restraint (54,56). 5. The chair under claim 1 is characterized by the backrest support structure (20) consisting of a frame (34) that includes one transverse section (36) and two longitudinal sections (38). The transverse section (36) is rotatably attached to the base structure (14) around such a pivot (24) and such a tilt restraint (36). 6. The chair, as per claim 1, is characterized by the fact that each control device (70',70") consists of a movable housing (78) which can move between two operating positions and a flexible path (90) which can move the fixed part (68',68") between the operating and non-operating positions according to the angular position of the movable housing (78). 7. The chair under claim 1 has the special characteristic that such a flexible path consists of a bick (32) that extends parallel to the pivot axis (22) of the seat support structure (18).