| 摘要 |
HAND-HELD DISPENSER WITH AUTOMATIC CAP VENTING A hand-held dispenser for a flowable product capable of gasifying, comprising a container having a neck part at its top, and a dispensing cap having a body part provided with a discharge opening. The cap-body and container-neck parts are cooperable to mount the cap on the container, and are constituted to form cooperable automatic pressure-relief valving means which, in response to increased gas pressure in the container, vents a limited quantity of gas when the container is upright. This prevents expelling or splattering of the container contents. A first annular sealing surface on one part and a cooperable annular sealing surface on the other part effect a seal when the cap is fully seated on the container, and permit escape of gas when the cap is slightly unseated. A projection on one part is engageable with a projection on the other part to provide a biasing action which returns the cap to fully-seated position after the venting. The cap part has a unique venting passage exterior to the seal, to conduct the vented gas downward past outwardly-projecting portions of the container neck part. Either the container neck part, or the cap body part is of yieldable plastic, or both may be yieldable. The advantage of the present construction over the devices of the prior art is that the simplicity of the venting structures makes the device less expensive to manufacture, without sacrifice in reliability or ease of use. |
