Abstract: An aircraft seat assembly (14) is convertible between three seats (LA, LM, LW) with a first seat width and two seats (LA, W) with a second wider seat width. The seat assembly includes a tube-in-tube support frame for the seats which allows the conversion to be accomplished by a simple sliding movement of the aisle and middle seat frames towards and away from the window seat frame which is fixed in position. Movement of the aisle and middle seat frames automatically changes the position of the two inside armrests (22, 24). The middle seat back frame (66) is vertically split into parts (66A, 66B). Movement of the seat frames from the three-seat configuration to the two-seat configuration disconnects seat back parts (66A, 66B) from each other and locks one part (66A) to the window seat back frame (64) and the other part (66B) to the aisle seat back frame (68).

Abstract: An aircraft seat assembly (12) is convertible between a first, narrower configuration of three seats (RA, RN, RW) and a second, widened seat configuration which adds an even increase in space between armrests (18, 22, 24). A seat assembly (12) includes a tube-in-tube support frame for the seats which allows the conversion to be accomplished by a simple sliding movement of the aisle and middle seat frames (RA, RM) toward and away from the window seat frame (RW) which is fixed in position. Movement of the aisle and middle seat frames (RA, RM) automatically centers the middle seat frame (RM) between the aisle and window seat frames (RA, RW) and automatically changes the position of the two inside armrests (22, 24) to provide even spacing therebetween. A lock mechanism (124, 130) locks the seat frame parts together, both in the first, narrower configuration and in the second, widened configuration.

Abstract: Two seat assemblies are provided side-by-side, in a row, on opposite sides of an aisle (16). A first seat assembly comprises window, middle and aisle seats (RW, RM, RA) which are movable between a first narrow seat spacing and a second wider seat spacing (FIGS. 7 and 8). The second seat assembly is convertible between three seats (LA, LM, LW) with the first spacing and two seats with the larger spacing (FIGS. 7 and 8). Each seat assembly includes a tube-in-tube support frame for the seats which allows the conversion and seat size to be accomplished by a simple sliding of movement of the aisle and middle seat frames towards and away from the window seat frame which is fixed in position (FIGS. 9 and 10).