A support assembly for an item of furniture, which support assembly includes: an elongated support structure for connection at an operatively upper end thereof to an upper portion of an item of furniture; a first pair of feet fast with the support structure, at or adjacent an operatively lower end thereof; an elongated guide formation fast with the support structure and extending lengthwise relative to the support structure; a support member displaceable with respect to the support structure which has a second pair of feet at or adjacent an operatively lower end thereof, the displaceable support member being arranged relative to the support structure so that a line drawn between the feet of the first pair is transverse to a line drawn between the feet of the second pair; the displaceable support member also being provided with an elongated guided formation complementary to and longitudinally slidably engaged with the guide formation, so that the displaceable support member is slidably displaceable along a rectilinear guide path which is transverse to the lines drawn between both the pairs of feet (32, 50), with one of the guide formation and the guided formation being in the form of a guided pin, the other one of the guide formation and the guided formation being in the form of a passage defining arrangement defining a guide passage within which the guided pin is longitudinally slidably received, characterized thereby that the passage defining arrangement comprises a hollow carrier with a pair of longitudinally spaced precision washers which engage the guided pin, the dimensions of the washers and the guided pin being such that automatic frictional engagement of the guided pin occurs, in use, with inner walls of the washers in response to pivoting of the displaceable support member about a pivot axis which is transverse to the displaceable support member's guide path, automatically to anchor the displaceable support member frictionally against sliding displacement relative to the support structure. an elongated support structure for connection at an operatively upper end thereof to an upper portion of an item of furniture; a first pair of feet fast with the support structure, at or adjacent an operatively lower end thereof; an elongated guide formation fast with the support structure and extending lengthwise relative to the support structure; a support member displaceable with respect to the support structure which has a second pair of feet at or adjacent an operatively lower end thereof, the displaceable support member being arranged relative to the support structure so that a line drawn between the feet of the first pair is transverse to a line drawn between the feet of the second pair; the displaceable support member also being provided with an elongated guided formation complementary to and longitudinally slidably engaged with the guide formation, so that the displaceable support member is slidably displaceable along a rectilinear guide path which is transverse to the lines drawn between both the pairs of feet (32, 50), with one of the guide formation and the guided formation being in the form of a guided pin, the other one of the guide formation and the guided formation being in the form of a passage defining arrangement defining a guide passage within which the guided pin is longitudinally slidably received, characterized thereby that the passage defining arrangement comprises a hollow carrier with a pair of longitudinally spaced precision washers which engage the guided pin, the dimensions of the washers and the guided pin being such that automatic frictional engagement of the guided pin occurs, in use, with inner walls of the washers in response to pivoting of the displaceable support member about a pivot axis which is transverse to the displaceable support member's guide path, automatically to anchor the displaceable support member frictionally against sliding displacement relative to the support structure.