| 摘要 |
A head depression type dispenser comprises a cylinder formed of an elastic material such as rubber. The cylinder is arranged between a head and a cap, and is constructed to operate as a piston for sucking and pressurizing liquid by axial deformation of the cylinder upon movement of the head. When the depressing force applied to its head is removed after the cylinder is deformed, the cylinder will return to the original shape by its own elasticity. In addition, a sealing piece extends from the cylinder into the passage of the head, thereby closely contacting the inner wall of the passage to form a secondary valve. The sealing piece becomes isolated from the inner wall of the passage when the hydraulic pressure in the cylinder exceeds the elasticity of the sealing piece, allowing the flow of the compressed liquid through the passage, and closely contacts the inner wall of the passage by the elasticity of the sealing piece when the hydraulic pressure becomes lower than the elasticity of the sealing piece. Since the cylinder can deform in its axial direction, it can be sufficiently deformed, thereby sufficiently pressurizing the liquid to a high pressure. |
