Pumps – Motor driven – Fluid motor
Reexamination Certificate
1999-09-27
2001-07-10
Tyler, Cheryl J. (Department: 3746)
Pumps
Motor driven
Fluid motor
C417S394000, C222S082000, C222S334000, C222S386500
Reexamination Certificate
active
06257844
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a pump device for pumping liquid foodstuff, e.g. ketchup, mustard, sauce, dressing or similar, wherein the pump device includes a pump housing, an inlet, an outlet, a pump body and at least one pump means, wherein the pump body has an elastic member which by means of the pump means can be stretched for imparting pump movements thereon for pumping foodstuff out of the pump housing through the outlet, and wherein the elastic member of the pump body is provided to perform, through contraction, suction movements for sucking foodstuff into the pump housing through the inlet.
BACKGROUND OF THE INVENTION
A pump device for foodstuff of this type is already known from U.S. Pat. No. 4,961,508 and the object of the present invention is to improve these pump devices such that one therewith can feed or discharge exactly the same amounts of foodstuff during each portioning step. A similar pump device, but for other substances than foodstuff is known from EP 0 390 298.
SUMMARY OF THE INVENTION
In an exemplary embodiment of the present invention a pump device for pumping liquid foodstuff is presented. The pump device includes a pump housing having an inlet and an outlet for pumping the foodstuff therethrough. A pump body is disposed within the pump housing having an elastic member which contains a predetermined volume of pressurized liquid. The pressurized liquid expands the elastic member from an unpressurized normal shape to a prestressed shape. The volume of liquid contained within the elastic member remains substantially fixed while the elastic member expands from its prestressed shape to a stretched shape to pump a predetermined amount of foodstuff out of the outlet.
Since the pump device according to the invention is provided with said characterizing features, it is attained that one for sure can feed or discharge exactly the same amounts of foodstuff during each portioning step, and that the elastic member of a pump body forming part of the pump device is prestressed such that said elastic member can contract to the same extent after every pump movement.
The invention will be further described below with reference to the accompanying drawing, which is a section through the pump device according to the invention.
REFERENCES:
patent: 2033210 (1936-03-01), Tennant et al.
patent: 3212447 (1965-10-01), Browne
patent: 4120424 (1978-10-01), Zygiel
patent: 4603793 (1986-08-01), Stern
patent: 577401 (1993-05-01), None
patent: 0390298 (1990-10-01), None
patent: 276735 (1970-07-01), None
ASEPT International AB
McCormick Paulding & Huber LLP
Tyler Cheryl J.
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