A hob assembly has a housing with a non-conductive ceramic cooking surface 2 fixed to a perimeter frame 1, and a lower support frame (5, fig 2) which presses an induction heater (6, fig 2) in contact with the underside of the cooking surface 2 by a fixing assembly which comprises a bracket having a base part 9 fixed to the housing and a tab which protrudes downwards from the base part through a slotted opening (22, fig 8) in the lower support frame, the tab having a coil spring 15 which is located in a loop-shaped opening so that the spring acts on the underside of the lower frame. The bracket is riveted to the perimeter frame 1, and the spring 15 has a small diameter end (16, fig 5) with a bolt or screw (18, fig 6) that engages a tang (13, fig 4c) of the bracket. During assembly the spring is compressed and slid into the opening.
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