Spring assembly

A spring assembly comprising coil springs supported on a spring support member,

• wherein the coil springs include at least a plurality of first coil springs and a second coil spring,
• wherein the spring support member includes a first support member and a second support member disposed to face the first support member,
• wherein one ends of the plurality of first coil springs are supported on a front surface of the first support member,
• wherein one end of the second coil spring is supported on the front surface of the first support member or a front surface of the second support member, and in this state, another end of the second coil spring protrudes further than other ends of the plurality of first coil springs,
• wherein a sum of elastic repulsive forces of the plurality of first coil springs is larger than an elastic repulsive force of the second coil spring in a state where the plurality of first coil springs and the second coil spring are compressed,
• wherein the other ends of the plurality of first coil springs are supported on a back surface of the second support member,
• wherein a holding mechanism that holds the plurality of first coil springs in a compressed state is provided between the first support member and the second support member,
• wherein when the second coil spring is pressed, after the other end of the second coil spring is compressed to a length of not protruding from the front surface of the second support member, the first coil springs held in the compressed state by the holding mechanism are further compressed from the compressed state.