Abstract: A chair tilting mechanism (1) is disclosed which has a fixed support (2), a seat support (3) and a backrest support (4). The seat support (3) is pivotally connected to the fixed support (2) by a pivot pin (5). The backrest support (4) is pivotally connected to the seat support (3) by a pivot pin (6). There is additionally provided a link (7) connected by pivot pins (8,9) to the backrest support (4) and the seat support (2). Because of the link (7), rotation of either the backrest or seat support causes the other of the backrest or seat support to tilt in a pre-determined synchronised manner. The manner in which synchronised tilting occurs is set by the interconnection of the various parts. The invention also provides a means (41) for pre-setting the interconnection.

Abstract: An adjustment mechanism (1) is disclosed which has a locking assembly (2) and an actuator (3). The locking assembly (2) is self-contained because it is biased by a spring (12) which acts between a housing (11) for the assembly and clutch leaves (5(a), 5(b)). The actuator (3) has a cam rod (15) which does not take any part in the clamping action on the leaves (5(a), 5(b)). There is a large mechanical advantage in the actuator (3) because the cam surface (17) is formed from a cut-out in the rod (15). A single actuator (45) may be used for two or more locking assemblies. Depending on configuration of the cam surfaces (48, 49), exclusive operation of one locking assembly may be achieved.