Liquid purification or separation – Filter – With movable means to compress medium
Patent
1996-09-20
1997-10-28
Walker, W. L.
Liquid purification or separation
Filter
With movable means to compress medium
210356, 2104161, 210453, 210488, B01D 2958
Patent
active
056814666
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a filtering appliance for use in removing debris and/or other matter from cooking oil in a food fryer.
The invention is especially, but not exclusively, concerned with a filtering appliance as aforesaid and which possesses, in combination, the features of single-handed portability and motorised operation. These features make it feasible conveniently to clean or partially clean the oil in a food fryer several times during a single day without disrupting the use of the fryer to an unacceptable extent.
We have found that, having regard to dimensional limitations imposed by the aforesaid single-handed portability, it is desirable to circulate oil through the filtering appliance at as high a rate, in terms of cubic measure per unit time, as possible and at the same time achieve a filtering performance, in terms of oil cleaning, consistent with certain regulations in the food industry. These requirements dictate that the filtering appliance comprises a cartridge type filter of generally elongate configuration and annular cross-section. Such filters are described, for example, in United States Patent Specifications Nos. 2753047 (Kettlewell) and 4632755 (Graffenried) both of which are concerned specifically with filters constructed from stacked annular filter elements. In each case, the filter stack is clamped between abutments which are fixed within a casing of the filter appliance when the appliance is assembled. These arrangements have the disadvantage that they are unsuited for use with a filter stack which is not dimensionally stable in the axial direction.
According to the present invention there is provided a filtering appliance comprising an elongate casing defining inwardly facing surface, a stack of annular filter elements disposed within the casing and defining outwardly facing surface and a hollow core, the annular filter elements being of a compressible material so that the length of the stack is variable in use according to the magnitude of force acting on the stack in the longitudinal direction thereof, the inwardly facing surface of the casing being spaced from the outwardly facing surface of the stack, an abutment means within and fixed to the casing and abutted by one end of said stack, means defining a duct in said abutment means for carrying fluid from the hollow core of the stack, fluid outlet means for discharging filtered fluid from the appliance and communicating with said duct, closure means defining mutually opposite faces of which one is in contact with an other end of the stack to prevent fluid flow directly into the said hollow core of the stack, the closure means being shiftable with respect to the casing to enable the closure means to follow the said other end of the stack when in use the length of the stack varies, fluid inlet means providing access to the outwardly facing surface of the stack and to the other face of the closure means, a spring arranged to act between the casing and the said other face of the closure means and urging the closure means to remain in contact with said other end of the stack, and an elongate former extending within the stack and having the annular elements arranged thereon so that the annular elements and the former are mutually relatively shiftable in the longitudinal direction thereof.
An embodiment of the present invention will now be described, by way of example, with reference to the accompanying drawings in which:
FIG. 1 is partly-sectioned side elevation showing a filter appliance in accordance with the present invention being used to remove debris and/or other matter from cooking oil in a food fryer;
FIG. 2 is a partly-sectioned side elevation of the filter appliance shown in FIG. 1 and to a slightly larger scale; and
FIG. 3 is a cross-sectional view on the line III--III in FIG. 2.
In FIG. 1 of the drawings, the filtering appliance consists of an elongate casing means indicated generally by reference numeral 10 and having an intake nozzle 11 at one end of the casing means 10 for sweeping over the floor 12 of a food fry
REFERENCES:
patent: 2753047 (1956-07-01), Kettlewell
patent: 3622003 (1971-11-01), Czech
patent: 4350590 (1982-09-01), Robinson
patent: 4632755 (1986-12-01), DeGraffenreid
patent: 4664814 (1987-05-01), Backman et al.
Goldberg Margaret Buchart
Goldberg Terence Murray
Griese Michael Phillip
Goldberg Margaret Buchart
Walker W. L.
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