Sliding lock mechanism for rotary seat assembly

In a rotary seat assembly comprising rails mounted on a floor, a lower base having leg portions on the lower surface thereof, said leg portions being slidably fitted to the rails, an upper base rotatably mounted on said lower base, a seat mounted on said upper base and a sliding lock mechanism for said rotary seat assembly comprising a lock means to lock the sliding movement of the leg portions relative to said rails and an operating means connected to said lock means, said sliding lock mechanism characterized in that said operating means is mounted to said upper base to provide said lock means with a substantially horizontal movement and that the location where the operating means is rotatably connected to said lock means is positioned on the substantially vertical rotation centerline of said upper base when said lock means is positioned to lock said leg portions;

• wherein said operating means has an operating lever which is connected to said upper base at a first location to substantially horizontally rotate about said first location and is connected to said lock means at a second location to substantially horizontally operate said lock means, and wherein said second location is positioned on the substantially vertical rotation centerline of said upper base when said lock means is positioned to lock said leg portions.