Patent ID: 8052400

Claim:
An air supply apparatus comprising: an air pump capable of supplying compressed air to an air chamber on the basis of rotation of a wheel; restriction means, provided outside a pump chamber of the air pump, for restricting the supply of compressed air from the pump chamber to the air chamber when the pressure of compressed air supplied from the pump chamber to the air chamber reaches a first set value; adjustment means for adjusting the first set value; and a relief valve which releases compressed air to the atmosphere when the pressure of compressed air supplied from the pump chamber to the air chamber is equal to or greater than a second set value greater than the first set value, wherein the restriction means is a change valve configured such that when the pressure of compressed air supplied from the pump chamber to the air chamber is less than the first set value, the change valve restricts air flow from the pump chamber to the atmosphere, and permits air flow from the pump chamber into the air chamber, wherein when the pressure of compressed air supplied from the pump chamber to the air chamber is equal to or greater than the first set value, the change valve permits air flow between the pump chamber and the atmosphere, and restricts air flow between the pump chamber and the air chamber, and wherein the adjustment means can adjust the first set value and the second set value simultaneously.