Abstract: A movable seat assembly, such as a removable vehicle seat, comprising a structure having front legs and rear legs, each of the legs including a fork member and arranged to co-operate with a fixed attachment rod of a frame. A movable lock member is provided on each leg and is used to lock the leg on the corresponding attachment rod. A return biasing means is provided for urging each of the lock members into its locked position, and manually operated means are provided for actuating each of the lock members into its unlocked position, against the return biasing means, in order to release the seat legs from the corresponding attachment rods.