Patent ID: 6378946
Filing Date: 2002-04-30
Classification: B60N

Abstract:
A seat backrest frame having a rigid peripheral frame structure which, relative to an in-use orientation, has a plurality of frame portions including laterally spaced, upstanding side portions, an upper transverse portion joining upper ends of said side portions and a lower transverse portion joining lower ends of said side portions, wherein each of said frame portions has an elongate channel form defined by respective side flanges and an interconnecting web, each said web is disposed forwardly with respect to said frame structure with the channel of each said frame portion opening rearwardly, each frame portion has an outer one of said respective side flanges such that the outer side flanges together define an outer periphery of the frame structure, each web is transversely arcuate so as to curve rearwardly to each respective side flange, each said side portion defines a forwardly projecting wing over at least the lower half of its length, such that the depth of each side portion channel in at least the region of said wing is substantially greater than the depth of said channels of said respective upper and lower transverse portions and such that each side portion progressively increases in front-to-rear depth from an upper end part of its length to the respective said wing, and wherein said peripheral frame structure is integrally formed by pressure die casting a light alloy selected from magnesium, aluminum and zinc alloys.