Patent attributes
A seat structure comprises a base (1), a back and a bolster (2) located on at least one edge of the base or back. The bolster (2) includes an upholstered cover (3) and a support structure (4) for controlling the position of the upholstered cover (3). The support structure (4) comprises: a support member (11) pivotally mounted for pivotal movement between a raised position in which the support member (11) supports the upholstered cover (3) in a raised state, and a lowered position in which the upholstered cover (3) is no longer supported in the raised state, a first strut member (14) pivotally connected to the support member (11) and a second strut member (16) pivotally connected to the first strut member (14) to form with the first strut member (14) an over-centre strut (13) which, when in its over-centre configuration, holds the support member in its raised state. Inflatable bladders (19, 20) are provided on opposing sides of the over-centre strut (13) and can be inflated in order to engage against the over-centre strut (13) and move it passed it trip position, thereby moving the support member (11) between its raised and lowered positions.
