Butchering – Deboning – Pressure type
Patent
1994-10-03
1996-02-13
Little, Willis
Butchering
Deboning
Pressure type
452170, A22C 1704
Patent
active
054908124
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The present invention relates to a device and a method for boning limbs of poultry or of animals of similar build, in particular, for boning wings and legs.
The prior art reveals the most different devices and methods for automating a boning process. Manual boning, i.e., manual removal of meat is relatively labor-intensive. Furthermore, a complete boning process is most of the time not possible, so that a relatively high percentage of usable mass of meat will remain on the bone. As a consequence, efficiency is very low. With automatically operating methods and devices, one must adopt such a procedure that rapid, reliable and thorough boning is possible with the manual efforts being as small as possible. Especially with small limbs, such as poultry legs or poultry wings, this requires great efforts.
The devices which are known from the prior art and designed for such uses are most of the time based on a fundamental technical principle in which the bone is removed from the meat during the boning operation. EP-A1-439 790, for instance, describes a device in which the limb is held at one end while the meat adhering to the other terminal bone is stripped off. Such a procedure is likely to fail because the whole stripping force has to be intercepted by the center joint. When the center joint has been damaged or when one of the two other bones has been broken, it is not possible to perform the boning operation. A similar removal is already known from FR-A2-566 629 where only a partial boning operation is, however, performed because the projecting bone is to serve holding purposes during consumption.
It is known from EP-A1-402 647 that, as far as poultry or the like is concerned, the center joint is punched out in the stretched state of the extremity and the bones are laterally removed. The problem arises here also that in case of a broken bone a complete removal is not guaranteed, so that additional checks are required. Furthermore, the bones are gripped on the outer joint balls, so that tendon parts or parts of the muscular tissue can also be removed due to the stripping and removing operations.
Apart from the functional reliability of the method, it is important with such boning processes that only a very small period of time is needed for the boning operation. It is only in this way that the devices can be used in an economic way.
Another problem arises with respect to the stability of the skeleton of the limbs to be boned. Especially with fattened poultry, the bones have no adequate strength. As a consequence, procedures are ruled out that are known from boning operations for other animals, such as pigs or cattle. It is, for instance, not possible to separate the bones in the longitudinal direction to perform the boning process.
It is the object of the present invention to provide a method and a device which, being of simple configuration and simple reliable applicability, permit a reliable boning of limbs. The inventive device and the inventive method are to be usable with both wings or legs of poultry and with comparable limbs of similar animals, such as rabbits, sheep, etc.
As for the apparatus, this object is attained according to the invention through a device having the following features: limb; and
The device of the invention is characterized by a number of considerable advantages. The principle underlying the invention is that the bones are pressed out from the meat of the limbs. Since bones have a very great compressive strength, adequate forces can be applied to push the bones out of the meat. Furthermore, no problems arise with partly broken or damaged bones because even a bone which has been broken into two parts can be pushed out in a reliable manner. Possibly existing splinters of bones are also removed through the existing channel. Since both the center joint and the end joints and/or end portions of the limbs are removed with the aid of the device of the invention prior to ejection, there just remains a substantially straight piece of bone which can be removed without any problems
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Abstract 8302495.
Abstract 2227827.
Little Willis
Schaartec GmbH & Co. KG
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