Dispensing – Resilient wall – Supply container delivering to receiving chamber
Utility Patent
1999-01-28
2001-01-02
Shaver, Kevin (Department: 3754)
Dispensing
Resilient wall
Supply container delivering to receiving chamber
C222S341000, C222S212000, C222S372000, C222S380000, C222S383100, C222S450000
Utility Patent
active
06168050
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a pump for dispensing liquids. The pump includes a hollow, cylindrical support body having an annular channel formed at a first axial end of the body and open towards the internal cavity of the body. A delivery duct is carried by the hollow cylindrical body and projects radially therefrom, the delivery duct being in communication with the annular channel by means of an orifice. Engagement structure is disposed at the other end of the hollow cylindrical body for the connection of the pump to a container of liquid to be dispensed, and a pumping member in the form of a resiliently-flexible, cup-shaped diaphragm which has its cavity facing the channel and a convex surface facing the structure for connection to the container of liquid is housed in the hollow cylindrical body. A flange is fixed to the diaphragm of the pumping member, projecting radially outwardly relative to the cavity and connected peripherally to the internal wall of the hollow cylindrical body in order to anchor the pumping member to the cylindrical body. A lever is mounted for pivoting about a pin carried by the hollow cylindrical body, the lever having a first end disposed inside the cavity of the hollow cylindrical body in contact with the convex surface of the cup-shaped diaphragm of the pumping member and a second end formed as a trigger, disposed outside the hollow cylindrical body, for the manual operation of the pumping member in opposition to the resilient force due to the deformation of the cup-shaped diaphragm of the pumping member.
BACKGROUND OF THE INVENTION
Pumps for dispensing liquids of the type specified above are known in the art.
Examples of these pumps are described in patents U.S. Pat. Nos. 4,138,038 and 3,995,774.
The basic problem encountered in known liquid-dispensing pump structures of the type specified above relates to the tortuous nature of the passageways for the liquid through the pumping member, which cause considerable pressure losses and thus appreciably reduce the efficiency of the pumps which, in any case, is limited owing to the very nature of small hand-operated pumps.
Another problem which is encountered in known pump structures relates to the poor functional capacity of the valve members in the pipe for drawing the liquid from the container and for supplying it to the delivery duct.
In known structures, these valve functions are performed by respective portions of a single annular lip of the cup-shaped diaphragm of the pumping member, these portions having to be deformed in opposite directions during each stage of the operation of the pump in order to draw liquid from the container and to supply liquid to the delivery pipe, respectively, whilst belonging to the same structural element of the diaphragm.
This leads to warping of the portions of the lip which are intended to operate as valve elements with consequent loss of sealing capacity and, in the final analysis, with a loss of efficiency of the pump.
The object of the present invention is therefore to provide a hand-operated pump structure for dispensing liquids having improved valve devices, the efficiency of which is maintained in the long term and in which tortuous paths are not created for the passage of the liquid to be dispensed, with the overall result of better pumping efficiency.
A further object of the present invention is to provide a very compact pump structure with a limited number of components all of which can be produced by molding.
The above-mentioned objects are achieved by a pump of the type mentioned above.
REFERENCES:
patent: 3749290 (1973-07-01), Micallef
patent: 3973700 (1976-08-01), Schmidt et al.
patent: 4101057 (1978-07-01), LoMaglio
patent: 4138038 (1979-02-01), Grogan
patent: 4155487 (1979-05-01), Blake
patent: 4204614 (1980-05-01), Reeve
patent: 5553752 (1996-09-01), Foster et al.
Deal David
Guala Dispensing S.p.A.
Nixon & Vanderhye P.C.
Shaver Kevin
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