Patent ID: 8689954

Claim:
A vehicle comprising: a vehicle body; a vehicle wheel; and a shock absorber operably positioned between the vehicle body and the vehicle wheel; wherein the shock absorber comprises an air chamber containing air, and at least a first pressure adjustment valve that introduces air at atmospheric pressure into the air chamber from the atmosphere when air pressure in the air chamber is below a lower threshold value; the first pressure adjustment valve includes a first check valve including a spring arranged to automatically adjust the air pressure in the air chamber during extension and compression movement of the shock absorber; the air chamber includes a first air chamber that reduces in volume upon extension of the shock absorber and that increases in volume upon compression of the shock absorber, and a second air chamber that increases in volume upon extension of the shock absorber and that reduces in volume upon compression of the shock absorber; and the shock absorber further includes a third pressure adjustment valve arranged to discharge air from the first air chamber to the atmosphere when the air pressure in the first air chamber becomes larger than an upper threshold value as a result of air in the first air chamber being compressed upon extension of the shock absorber, and the third pressure adjustment valve is not coaxial with the first pressure adjustment valve.