| 摘要 |
PURPOSE:To make a tire holdable airtightly despite being simple in structure, by coupling both large and small rim pieces with a transfer body installed in a core part via a link. CONSTITUTION:When a cylinder 21 is drawn back, a transfer body 19 is solidly drawn back in one so that each of rim pieces 4 and 5 is pulled by dint of links 28 and 28' and they are drawn in the inner part whereby a rim outer diameter becomes contracted. Under this condition, an outer circumferential surface of each rim is formed by a large diametral rim piece 4 alone. A tire 30 is fitted in the rim diametrically contracted like this, and when air is fed from an air hole 22 at the opposite side to a cylinder device 17 and its cylinder 21 is made to go forward, these rim pieces 4 and 5 are moved outward whereby the rim outer diameter is diametrically expanded large. With this constitution, engagement between a bead part of the tire 30 and a rim outer circumference is strengthened enough, thus the tire 30 is firmly held by the rim body 2. In a state that both circumferential surfaces of the small rim piece 5 and the large rim piece 4 are situated on the same circumference of a circle. |
