DEVICE FOR BONING PIECES OF MEAT WITH SHAPED STAMPS

Abstract: A device for boning pieces of meat, such as shoulders, hams and the like, which device consists substantially of at least one set of first and second matrices (3, 4) with separating means to be carried towards one another for separating the meat from the piece of bone and a replaceable stamp (5, 6) arranged in one of each matrix, of which the elongate, if necessary folding pressure surface coming into contact with the piece of bone displays a relief, wherein in cross section the relief of the pressure surface is raised at least along the edge zones thereof, and the raising increases in those cross sections at the edge portions having a comparatively small radius of curvature, so ensuring that during pressing the piece of bone remains enclosed an even undergoes a pressure force directed lengthwise of the piece of bone.

Description: The invention relates to a device for boning pieces of meat, such as shoulders, hams and the like, which device consists substantially of at least one set of first and second matrices with separating means to be carried towards one another for separating the meat from the piece of bone and a replaceable stamp arranged in one or each matrix, of which the elongate, if necessary folding pressure surface coming into contact with the piece of bone displays a relief. Such a device is known for instance from the European publication 0 086 020. In this publication the means accommodated in the matrix for supporting the piece of bone are shown as layers of yielding material such as rubber. These insert pieces have a more or less contoured form that is adapted to the shape of the piece of bone to be removed from the piece of meat. This relief is arranged in order to prevent as far as possible any bone breakage during the pressing, which in practice has been found to be unsatisfactory. The invention has for its object to provide a device whereby bone breakage is virtually prevented. The invention provides to this end a device that is distinguished in that in cross section the relief of the pressure surface is raised at least along the edge zones thereof, and the raising increases in those cross sections at the edge portions having a comparatively small radius of curvature. Thus ensured is that during pressing the piece of bone remains enclosed and even undergoes a pressure force directed lengthwise of the piece of bone. The invention further proposes to embody the stamp wholly or partially in an undeformable material with great compression strength such as metal. It has been found empirically that the shape of the relief does not have to correspond with the piece of bone in order to avoid the undesired breakage. For this purpose the stamp is manufactured for particular pieces of bone with a relief corresponding to the annexed figures. The invention is further elucidated with reference to the figure description hereinafter of a number of embodiments. In the figures: Fig. 1 shows a top and bottom view of a set of matrices lying at a mutual interval, fig. 2 is a top view of the first matrix in fig. 1, fig. 3 shows a lengthwise section of the first matrix from fig. 1, fig. 4 and 5 show respectively a bottom view and a lengthwise section of the second matrix from fig. 1, fig. 6a shows a peripheral configuration of the stamp from fig. 2 of the first matrix, suitable for shoulder pieces, fig. 6b is a lengthwise section along the line VI-VI in fig. 6a, fig. 6c shows twenty sections in accordance with the cross section in fig. 6a designated with the same numerals, fig. 7a, b, c show a peripheral configuration, lengthwise and cross sections corresponding with fig. 6 of the stamp from fig. 4, suitable for shoulder pieces, fig. 8a, b, c show respectively a top and side view and cross sections of a part of the stamp from fig. 5, fig. 9a, b show respectively a top view and section of a filler part belonging to the stamp part from fig. 8, fig. 10 shows a top view and a section of the stamp part from fig. 3, fig. 11 and 12 show a view and lengthwise section corresponding with fig. 2 and 3 respectively of an alternative embodiment of the stamps in the first matrix according to the invention, fig. 13 and 14 are a top view and lengthwise section corresponding with fig. 4 and 5 respectively of an alternative embodiment of the stamp in the second matrix according to the invention, fig. 15a and b show respectively a top view and cross sections 1-10 of the stamp part from fig. 14, fig. 16a and b show respectively a top view and cross sections 1-9 and 10-15 of an alternative embodiment of the stamp part of fig. 14 suitable for a shoulder piece, fig. 17a, b and c show respectively a top view, a lengthwise section A-A and cross sections 1-18 of a stamp for the first matrix, suitable for boning hams, fig. 18a, b and c show respectively a top view, a lengthwise section A-A and cross sections 1-20 of a stamp for the lower matrix, suitable for boning ham pieces, fig. 19, 20 and 21 each show respectively a top view, cross sections 1-12, 1-11 and 1-8 of stamp parts suitable for boning hams pieces. The set of matrices as according to fig. 1 is movable towards and away from one another by unshown means, whereby the co-action is such that the matrix edges 1 and 2 of the first matrix 3 and the second matrix 4 respectively join together precisely. These edges 1 and 2 form the separation means for severing the piece of meat shown with broken line V from the piece of bone B. It is possible with the matrix configuration shown to as it were punch the piece of bone out of the piece of meat. The piece of bone B thereby falls as precisely as possible within the matrix edges 1 and 2. Serving to sever the meat round the piece of bone is a stamp in the first and second matrix 3, 4, which stamp is shown in detail in the following figures in a number of embodiments. It is noted that the stamp 5 can move up and downward relative to the first matrix 3, while the stamp 6 of the second matrix 4 is arranged fixedly therein. Both stamps 5, 6 however are placed in the matrices 3, 4 so as to be replaceable. Fig. 2 and 3 show a detail of the first matrix 3 having arranged therein the stamp 5 which consists here of three parts 5a, b and c. The part 5a is supported on three rams 7 bearing mounted in the matrix 3, while the matrix portion 5b is embodied with a plunger 8 extending towards the bottom which supports on a fourth ram 9. The plunger 8 of the stamp parts 5b, 5c is directed such that when the ram 9 is moved upward relative to the matrix 3 the stamp parts 5b and 5c move away from one another. Fig. 4 and 5 show in detail the stamp of the second matrix 4 which here also consists of three parts, namely stamp parts 6a, 6b and 6c. The stamp part 6a co-acts with the stamp part 5a from fig. 3, while the stamp parts 6b and c co-act with the stamp parts 5b and c from fig. 2. It is remarked that the stamp parts 5a and 6a are cast, machined or otherwise manufactured from metal, while 6b and 6c can be made of plastic. The invention is however not limited in the choice of material, with the proviso that the material does have to be form-retaining and must display a high compression strength. The matrix shown in fig. 1-4 serves for shoulder pieces whereby the shoulder blade of the foreleg of for instance a pig comes to lie between the stamp parts 5b and c and 6b and c, while the two other leg pieces of the bone come to lie between the stamp parts 5a and 6a. The pressure surface of the stamps, that is, the mutually facing surfaces of the stamps in the first and second matrix 3, 4 has a predetermined relief for a particular type of piece of bone. Worthy of note here is that the relief does not exactly match the peripheral form of the bone to be removed from the piece of meat V. The relief is chosen such that the piece of bone is loaded in optimal manner during pressing such that it does not break. The relevant form for this purpose is shown in the figures 6-10 whereby a particular configuration of the pressure surface is shown both in lengthwise direction of the elongate pressure surface and in many cross sections. It is hereby noted that at least the edge strips of the pressure surface of the stamp displays an elevation which increases in height towards at least one end, that is, the left-hand end in fig. 2 and 4, and particularly increases in height at that location where the edge strip has a large radius of curvature, for instance in fig. 2 at the locations A, B,. It is further noted that close to these raised edge strips means are arranged in the bottom of the relief for placing the piece of bone under pressure, such as three ribs 10 in fig. 2 and 4, and sloping surfaces 11 in the above mentioned figures. Fig. 11-14 once again show a set of matrices with stamps arranged therein which deviate from those of the preceding figures, particularly in the dividing up of the matrix parts 5b, 5c. In fig. 11 the corresponding matrix parts 15b and 15c are separated from one another by a bending severing surface 16, while in the embodiment of fig. 2 this is a straight surface. The associated counter-stamp from fig. 14 is shown in fig. 15. Fig. 16 shows a stamp part forming an alternative to the stamp part as in fig. 10 which is placeable in the first or lower matrix from fig. 3. Shown in fig. 17-21 are the replaceable stamp parts for matrices according to the device from fig. 1 which are particularly suitable for boning pieces of ham instead of the shoulder pieces as described with reference to the figures 1-16.

Claims: Device for boning pieces of meat, such as shoulders, hams and the like, which device consists substantially of at least one set of first and second matrices with separating means for carrying towards one another for severing the meat from the piece of bone and a replaceable stamp arranged in one or each matrix, of which the elongate, if necessary folding pressure surface coming into contact with the bone piece displays a relief, characterized in that in cross section said relief of said pressure surface is raised at least along the edge zones thereof, said raising increases in those cross sections at the edge portions with a comparatively small radius of curvature. Device as claimed in claim 1, characterized in that the or each stamp is wholly or partially manufactured from an undeformable material with great compression strength, such as metal. Stamp for a device as in Claim 1 provided with a pressure surface having a relief as shown in the figures 6, 7, 8, 9, 10, 15 and 16, suitable for boning shoulder pieces. Stamp for a device as in Claim 1 provided with a pressure surface having a relief as shown in the figures 17, 18, 19, 21, suitable for boning hams.

Inventors: LANGEN, CHRISTIANUS PETRUS, LANGEN, JOHANNES CHRISTINA
Applicants: LANGEN RESEARCH B.V.
Application year: 1989
Main classification: A22C17
IPC codes: A22C17