Lightweight seat for high-density configurations and cluster of adjacent seat, the seat comprising a support structure (10) supporting a seat pan (20) comprising a rigid shell (21), a lining (23) and an intermediate foam (22), and a backrest (30), wherein most of the rear portion (20A) of the seat pan (20), covering at least one rear third thereof, and at least left and right rear corner regions (20L, 20R) contained within a 10 cm radius from the left and right rear corners, have a thickness equal to or less than 25 mm or 15 mm, and in a front portion (20B) of the seat pan, covering at least a front third thereof, the rigid shell (21) defines a descending slope of at least 15 towards a front edge of the seat pan (20) and the intermediate foam (22) defines a wedge of at least 15.

A chair includes a plurality of legs, a seat, at least one seat extension member movably connected to the seat, a back support connected to the seat via a frame, the back support having at least one cavity, at least one back support extension member movably received in the at least one cavity, an arm support, and a connector extending between a first seat extension member from among the at least one seat extension member and the arm support, the connector connecting the first seat extension with the arm support. A method of using the chair includes moving the at least one seat extension member away from the seat to widen an area of the chair used for sitting, and/or moving the at least one back support extension member away from the back support to widen an area of the chair used for supporting a user's back.

An armrest assembly for a vehicle seat includes an armrest body and a first shaft that extends from a first side of the armrest body along an armrest axis and is attached to the armrest body for relative rotational movement about the armrest axis. The armrest assembly also includes a second shaft that extends from a second side of the armrest body along the armrest axis and is attached to the armrest body for relative rotational movement about the armrest axis. A detent body is fixed on the first shaft and includes a first detent and a second a second detent. A stop is fixed on the armrest body. The stop is retained in the first detent when the armrest body is in a first position relative to the first shaft. The stop is retained in the second detent when the armrest body is in a second position relative to the first shaft.

The present disclosure provides a backrest folding assembly and a seating equipment. The backrest folding assembly includes a fixing piece, an upper linkage rod, a lower linkage rod, a fixing piece for a folding plate, a middle linkage rod and a protection plate. An end of each of the upper linkage rod and the lower linkage rod is rotatably connected with the fixing piece respectively, and the other end of each of the upper linkage rod and the lower linkage rod is rotatably connected with the fixing piece for the folding plate respectively; the middle linkage rod is rotatably connected with the lower linkage rod, and the protection plate is rotatably connected with the upper linkage rod and the middle linkage rod respectively.