| 摘要 |
A foam pump includes a fluid cylinder, an air cylinder, and a mixing chamber, in which the fluid cylinder is adapted to draw a fluid therein in a priming stroke, and to pump the fluid into the mixing chamber in a dispensing stroke, in which the air cylinder is adapted to draw air therein in a priming stroke, and to pump the air into the mixing chamber in a dispensing stroke, in which the mixing chamber includes a fluid throughflow axis, in which the fluid cylinder and the air cylinder are co-axial with one another and are aligned on a second axis which is substantially normal to the fluid throughflow axis, in which the fluid cylinder and the air cylinder are provided with a common piston member, and in which the foam pump includes spring means adapted to bias the common piston member to perform a priming stroke of the fluid cylinder and the air cylinder. |
| 主权项 |
1. A foam pump comprising a fluid cylinder, an air cylinder, and a mixing chamber,
in which the fluid cylinder is adapted to draw a fluid therein in a priming stroke, and to pump said fluid into said mixing chamber in a dispensing stroke, in which the air cylinder is adapted to draw air therein in a priming stroke, and to pump said air into said mixing chamber in a dispensing stroke, in which the mixing chamber comprises a fluid throughflow axis, in which the fluid cylinder and the air cylinder are co-axial with one another and are aligned on a second axis which is substantially normal to said fluid throughflow axis, in which the fluid cylinder and the air cylinder are provided with a common piston member, in which the foam pump comprises spring means adapted to bias said common piston member to perform a priming stroke of the fluid cylinder and the air cylinder in which the foam pump further comprises a valve chamber provided with a fluid inlet and a fluid outlet, in which said fluid inlet and said fluid outlet are arranged on said fluid throughflow axis, in which the fluid cylinder is in operative connection with said valve chamber, in which said fluid inlet is controlled by a first valve member adapted to open during a priming stroke of said fluid cylinder and to shut during a dispensing stroke of said fluid cylinder, and in which said fluid outlet is controlled by a second valve member adapted to shut during a priming stroke of said fluid cylinder and to open during a dispensing stroke of said fluid cylinder, and in which said second valve member comprises a resilient annular cone mounted on a boss, in which said annular cone comprises an outer rim, in which said outer rim is urged against an inner surface of said valve chamber by a negative pressure generated inside said valve chamber during a priming stroke of said fluid cylinder, and in which said outer rim is forced away from said inner surface by a positive pressure generated inside said valve chamber during a dispensing stroke of said fluid cylinder. |
