Tilt device for seat furniture

A tilt device for seat furniture, comprising:

• (a) a base which can be fastened to an underframe of the seat furniture and which serves as a carrier for a seat and a backrest;
• (b) an angular backrest carrier with a lower leg and an upper leg, said backrest carrier being rotatably mounted on the base in a middle region of its lower leg by means of a rotary bearing and consisting, at least in its lower leg, of two backrest cheeks arranged parallel to and at a distance from one another;
• (c) a seat plate which is supported at least in its front region by the base;
• and
• (d) at least one spring element having one end which is fastened to the base and another end which engages the backrest carrier behind the rotary bearing and exerts an upwardly directed force on the backrest carrier;
• wherein:
• (e) the base is designed as a narrow closed carrier box which is composed of a plurality of sheet-metal parts and which is arranged between the backrest cheeks;
• and
• (f) the carrier box has on its front side a sheet-metal crossmember which projects laterally beyond the backrest cheeks and which carries the seat plate in its front region;
• the tilt device further comprising:
• (g) a locking device having a locking pin which can engage into a plurality of locking bores located at the front of the backrest carrier, the locking bores being made directly on the front end of one of the backrest cheeks, and the crossmember having on the side which projects beyond the backrest cheek equipped with the locking bores, two mutually spaced tabs which are perpendicular to the crossmember and in which the locking pin is guided.