box-spring

Box Spring is a geyser in the Lower Geyser Basin of Yellowstone National Park in the United States.

A box-spring (or divan in the UK) is a type of bed base typically consisting of a sturdy wooden frame covered in cloth and containing springs. Usually the box-spring is placed on top of a wooden or metal bedframe which sits on the floor and acts as a brace, except in the UK where the divan is more often fitted with small castors. The box-spring is usually the same size as the much softer mattress which is placed above the box-spring. Working together, the box-spring and mattress (with optional bed frame) make up a bed. It is common to find a box-spring and mattress being used together without the support of a frame underneath, the box spring being mounted directly on casters standing on the floor. The purpose of the box-spring is threefold:

• to raise the mattress' height, making it easier to get in and out of bed;
• to absorb shock and reduce wear to the mattress; and
• to create a flat and firm structure for the mattress to lie upon.