Dual-intake air capsule
A dual-intake air capsule includes a hollow main body having a resilient top, an opposite bottom and a side wall connecting the top and the bottom. Two intake valves and two discharge valves are mounted to the side wall. A resilient pillar is arranged inside the main body with a lower end fixed to the bottom and an upper physically engaging and thus supporting the top. All the valves are one-way valves whereby when the top of the main body is depressed by an external load, air inside the main body is pumped out through the discharge valves. When the loaded is removed, the resiliency of the top of the main body and the resilient pillar return the top of the main body to the original position, which forces surrounding air into the main body through the intake valves. Thus air can be continuously pumped by the air capsule.
1 . A dual-intake air capsule, comprising a main body having a resilient top and a bottom, two intake valves and two outlet valves mounted to the main body, a resilient pillar being mounted to the bottom of the main body and having an upper end physically engaging and thus supporting the top of the main body.
2 . The dual-intake air capsule as claimed in claim 1 , wherein the pillar is made of a polymeric material.
3 . The dual-intake air capsule as claimed in claim 2 , wherein the polymeric material comprises polyurethane.
4 . The dual-intake air capsule as claimed in claim 1 , wherein the bottom of the main body defines an opening, the pillar having a lower end around which an annular groove is defined to receive an inner circumference of the opening therein to securely fix the pillar inside the main body and form an airtight sealing between the pillar and the opening.