Butchering – Deboning
Patent
1998-05-15
1999-05-18
Little, Willis
Butchering
Deboning
452137, A22C25/16
Patent
active
059046163
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a process and a device suited for removing bones from filets of meat, and then especially fishbones from untrimmed or un-deboned filets.
When trimming and deboning fish, and especially raw, smoked or cured fish, e.g. salmon or trout, the ventral ribs often remaining the fish meat or the filet after cleaning and cause problems for further processing and when eating the fish. As an example, when cutting thin slices from smoked or cured salmon or when preparing sushi, it is necessary to use boneless filets as a starting material. The preparation of other types of fish filets also requires that all bones are removed from the fish meat prior to serving.
Previously it was thus customary to remove bones from partially cleaned fish by using pliers, tweezers or other types of deboning tools where each bone is removed separately one by one. Such removal of bones is cumbersome and tedious and has as a consequence that the preparation proceeds slowly and that the product becomes more expensive than if such bones were removed automatically or in a rational manner.
Such a problem situation makes a basis for patent application No. 93.2591 disclosing a device for removing bones from fish. Such a previously known device comprises a stationary housing wherein a drum or a wheel is rotating with respect to the housing. The function of the device resides in the fish bones are to be wedged between the housing and the drum and that the bones are to be pulled out from the meat by the rotation of the drum. However, such a device has proven not to be serviceable in practice, since the fish bones either have a tendency to either to stop the drum by becoming tightly. wedged, or they do not become gripped tightly enough by the drum so that they "slip" back into the meat. Furthermore, it is not sufficiently ensured that the bones fit into a slot in the housing wherein the drum rotates.
Consequently there still exists a need for an improved device for removing fish bones from fish meat and which makes manual removal of bones one by one unnecessary.
For getting hold of the fish bones lying hidden inside the fish meat, the fish meat has previously been scraped with a tool with a sharp edge, e.g. a knife. Thereby the meat around the fish bones will become scraped away or become retracted from the end of the bone so that this protrudes from the piece of meat. Such a scraping of pieces of meat and filets has previously been used in connection with manual removal of bones from fish, as disclosed supra. According to the present invention it is preferred, but not necessary, to pretreat the fish meat in the same way.
According to the present invention it has now been found that an extraction instrument comprising two reciprocally and uni-directionally rotating drums will grip and remove the fish bones from a fish filet in a more reliable and easier way than the device indicated supra. Such a de-boning device will comprises those features which are defined in claim 1 in the present application, and will be especially suited for removing bones from pretreated pieces of fish wherein the pieces of fish are scraped to lay the fish bones open.
The invention will be described more closely infra with reference to the enclosed figures wherein:
FIG. 1 shows a main view for the design of the device according to the present invention,
FIG. 2 shows a sectional view of the device according to the present invention,
FIG. 3 shows as an example a design of parts which may be included in the device according to the present invention.
Under reference to the present figures the device according to the present invention comprises two reciprocally rotatable wheels or drums 1,2 wherein the one internal drum 2 may rotate inside the second external drum 1. The rotational direction of both drums is the same, but the rotational speed of the internal drum 2 is somewhat larger than the rotational speed of the outer drum 1. Obviously, the diameter of the internal drum 2 is somewhat smaller than the diameter of the external drum 1. The distance
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patent: 5084056 (1992-01-01), Ecker et al.
patent: 5135430 (1992-08-01), Jordan et al.
patent: 5525101 (1996-06-01), Soperlind
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