| 摘要 |
A foam dispensing article is provided which includes a reservoir for receiving a liquid product and an operating unit for dispensing foam as an air-liquid mixture. The unit includes an air pump, a liquid pump concentrically surrounded at least partially by the air pump, an operating component positioned above the pumps containing a foam forming screen device, and a spring system. The spring system functions to return pistons of the air and liquid pumps to an unactivated position and includes an inner spring positioned internally concentric to the air piston. The improvement of the present invention is characterized in the spring device having a return force greater than 4 lbs. (17.8 N). In one embodiment, the spring device includes both an outer spring conically tapered and surrounding an inner spring. The outer spring provides the required force in excess of 4 lbs. (17.8 N). Less liquid drip and piston stickage is achieved with the improvement to the spring system.
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