1983-03-08
1986-06-17
Abercrombie, Willie G.
17 46, A22C 1704
Patent
active
045947511
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a method and a device for deboning meat such as hams, shoulders and legs of animals and poultry by bringing them under pressure in a press while allowing a sideways escape for the meat transversely to the pressing direction, so that by the pressure the meat is loosened from the bones and moves sideways while the bones are retained between the opposite cooperating pressing surfaces, after which the said meat is removed separately from the bones.
Such a method and device are known from Netherlands patent application No. 77.07838. Therein the meat is not degenerated in structure but is pushed away sideways in relatively large lumps and thus loosened substantially from the bones therein. This is a method different from what happens in the so-called bone presses, in which bones and meat are compressed in a closed space under high pressure, the meat being thereby transformed into a paste-like condition, so that it can leave the space throught small openings. Such bone presses are often used for reclaiming meat remnants still attached to the bones after they have been obtained by deboning e.g. by hand, or for obtaining meat from small animals with a lot of relatively small bones such as poultry and fish.
The invention aims at improving such known deboning methods and devices in order to obtain a more complete removal of meat from the bones with less damage to the meat and less crushing of the bones at relatively low pressures.
To this end a method according to the invention as indicated in the preamble above is characterized in that at least one of the cooperating pressing surfaces has means conforming in shape to the shape of the bones.
This means that at the end of the pressing operation the bones find a space between the pressing surfaces so that on the one hand they are not crushed between these surfaces and on the other hand these surfaces can contact each other in all zones where there is no bone between them so that the meat is more completely pushed out. This gives a high yield of meat which no bone splitters and, for a good taste, no bone marrow is present. On the other hand a considerable part of the connective tissue, by which the meat is connected to the bones, remains with the bones and is thus separated from the meat.
There are in essence two different ways to apply the invention, one being the use of a pressing surface with a recess substantially conforming to the shape of the bones, the other being to apply an elastically deformable press platen which adapts itself to the shape of the bones during pressing, but both ways may be combined.
The invention thus relates to methods and devices based on both possibilities, as will become clear from the following description of the drawings and from the attached claims. Said drawings give several preferred embodiments of a device according to the invention and in said drawings:
FIG. 1 is a vertical section at the left and elevation at the right of a vertically operating press device according to the invention in a first embodiment;
FIG. 2 is a vertical section of the device of FIG. 1 along the line II--II in FIG. 1 in the left part, and an elevation from the outside as seen in the same direction in the right part;
FIG. 3 is a view of a detail of this device;
FIG. 4 shows on a larger scale in vertical section a part of the device of FIG. 1 and 2 in a different embodiment;
FIG. 5 is a section along the line V--V in FIG. 4 of this detail;
FIG. 6 shows a view of the upper pressing surface of such a device according to FIGS. 4 and 5 in one of many possible embodiments;
FIG. 7 shows this upper pressing surface in one of the other possible embodiments;
FIG. 8 shows somewhat diagrammatically the most important parts of a device according to the invention in another embodiment in horizontal view from the side; and
FIG. 9 shows a partial section on a larger scale of the device of FIG. 8 according to the line IX--IX in FIG. 8.
The device shown in FIGS. 1 and 2 has a frame 1 and therein a conveyor belt 2 guided over end rollers 3 and 4, with
REFERENCES:
patent: 2897536 (1959-08-01), Bergstrom
patent: 3612128 (1971-10-01), Beck
patent: 3762258 (1973-10-01), Bender
Abercrombie Willie G.
Protecon B.F.
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