1980-06-20
1983-03-15
Abercrombie, Willie G.
A22B 508
Patent
active
043763251
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a surface cleaning device for removing undesirable offals, such as glands, loose membranes, veins, blood vessels and blood from the muscles as well as hair and bristles from the rind, in particular in hogs.
The problem of these operations resides in the wish for a removal as complete as possible of said offals without simultaneously damaging the muscles and the rind, respectively, and that this can be done at unprohibitive costs.
In the slaughtering line it is known to use so-called gland tongs to remove glands and veins in particular from the internal neck area in hanging hog carcasses, but this operation is time-consuming, manually strenous for the operative and fails to meet the wish for a complete removal and does not remove surface blood.
Moreover, it is known, for the same purpose to employ a machine-powered, narrow, cutter-like gear wheel, but it suffers from serious drawbacks because only to a very limited extent is this gear wheel able to remove glands and veins and, further, the neck area is rather wide, necessitating several, parallel, up and down movements to remove glands, etc., and since the muscles in the area in question do not lie in one plane or one cylindrical face, it will not help making the known cutter wheel wider because the cutter teeth will then protrude into and lacerate the protruding muscles when treating the deep-lying muscles. Moreover, even the rather narrow cutter wheel requires utmost care on the part of the operator because even a slight increase in the engagement pressure of the cutter wheel against the muscle will lacerate and thus destroy the muscle.
For dehairing carcasses it is known to rotate said carcasses resting horizontally on one or more horizontal support rollers provided with so-called beaters of an elastic material and optionally provided with nose irons. In these dehairing devices it is a considerable drawback involving large costs that the beaters are worn rather quickly and thus loose their dehairing effect and must eventually be replaced with consequent large costs in terms of materials, wages and lost production, and finally, the dehairing effect of said beaters is such that it is necessary to carry out one or more subsequent treatments in the form of burning and brushing to remove the remaining brushes and irregularities.
The objct of the present invention is to eliminate said problems of said operations. This is achieved according to the invention by a surface cleaning device of the type having several, individual scraper elements at engagement ends of fingers arranged to remove undesirable offals by movement along and towards and away from the flesh surface and/or rind.
Hereby it is achieved that the individual scraper fingers apply an engagement pressure, independent of the other scraper fingers, to the surface being processed so that also the deeper surfaces are cleaned without the protruding surfaces becoming destroyed. Another advantage is that for a given finger and wheel geometry the engagement pressure will increase with the square of the number of revolutions, while the scraper rate will increase substantially only linearly with the number of revolutions.
In one embodiment, the scraper fingers consist of plate-like material having engagement ends provided with slots tapering in a direction away from the end edge. Such finger provides a very satisfactory increase in the efficiency of the device. For removing veins and glands in the treatment of muscles, without any damage to the muscles, scraper fingers are used where the slots largely taper in the direction of rotation of the fingers, while fingers with an opposite taper, seen in cross section, have proved to be particularly expedient for removing bristles and hair from rinds.
The provision of a grinding surface at the engagement end of some or all of the scraper fingers has been found to be suitable for dehairing, in that a large portion of the remaining hair and surface irregularities caused by e.g. tetter are removed.
One embodiment of the invention uses rigid scra
REFERENCES:
patent: 695231 (1902-03-01), Preston et al.
patent: 990754 (1911-04-01), Lebiedzinski
patent: 1001640 (1911-08-01), Hannaford
patent: 1214493 (1917-02-01), Allbright
patent: 1249774 (1917-12-01), Kramer
patent: 2204755 (1940-06-01), Gonsor
patent: 2614286 (1952-10-01), Ittel
Boas Peter F.
Petersen Olfert H.
Abercrombie Willie G.
Slagteriernes Forskningsinstitut
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