Patent
1981-03-03
1983-07-12
Abercrombie, Willie G.
A22B 516
Patent
active
043922740
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an apparatus for pulling-off the skin of sheep carcasses in connection with slaughtering, comprising an essentially horizontal drum which is arranged to pull off the skin during winding thereof on the drum, the drum being moved upwards along the dorsal side of a sheep carcass suspended from the hind legs.
In connection with slaughtering of big cattle there are known devices for hide pulling wherein a drum is arranged to pull off the hide during simultaneous winding thereof on the drum. However, the known devices are not practically usable for pulling-off of skins in sheep slaughtering, as they do not provide for the necessary and appropriate distribution of the pressure on the skin and the sheep carcass around the whole carcass, with the result that the carcass cracks on exposed places, and the membrane which is to remain on the carcass is pulled off together with the skin.
The object of the invention is to provide an apparatus for pulling-off skins of sheep and lamb carcasses by which there is achieved a rational and effective skin pulling, and wherein the drum is especially shaped in order to achieve reduced working effort in flaying and simultaneously ensure gentle skin pulling without damage of the carcass.
The above-mentioned object is achieved with an apparatus of the type set forth above, which, according to the invention, is characterized in that the drum has a gradually increasing diameter from a central portion towards both ends, and is mounted at the free end of a pivotable lifting beam which is provided with a means for upwards directed pivoting movement of the beam during the pulling operation, and that there is provided a means for rotation of the drum synchronously with the pivoting movement of the lifting beam and with a speed which is adapted to the movement of the lifting beam.
The invention will be more closely described below in connection with an exemplary embodiment with reference to the accompanying drawings, wherein
FIG. 1 shows a side view of a schematically shown skin puller apparatus according to the invention;
FIG. 2 shows a front view along the line II--II in FIG. 1;
FIG. 3 shows a top view of the apparatus in FIG. 1; and
FIG. 4 and 5 schematically illustrate two different operational phases during a skin pulling-off operation.
As shown in FIGS. 1-3, the skin puller apparatus in the illustrated embodiment comprises a vertically disposed, rectangular steel frame 1 having vertical side members carrying suitable bearing means 2 for pivotal mounting of one end of a lifting beam means 3. The bearing means 2 may be displaceably mounted on the side members of the frame. The lifting beam means 3 comprises a pair of e.g. telescopically extendable tube and rod members 4 and 5 and a pair of bracing members 6 extending therebetween. On the free ends of the rod members 5 there are mounted bearings 7 for the support of an essentially horizontal drum 8 which is to be described below. The lifting beam means with the drum is pivotable upwards and downwards by means of an operating means which in the illustrated embodiment comprises a hydraulic cylinder and piston unit 9 (cylinder I). At its upper end the hydraulic cylinder 9 is pivotally connected to an upper cross member of the frame 1, whereas the lower free end of the piston rod 10 is pivotally mounted between a pair of holding plates 11 attached on the bracing members 6 and provided with a plurality of apertures 12 or the like for adjustable mounting of the piston rod end.
On the subgrade, at a suitable distance in front of the lifting beam means 3, there is provided a clamping means with a combined holding and stretching funtion which is to be described more closely below in connection with the use of the apparatus. In the illustrated embodiment the clamping means comprises a supporting frame 13 for the support of a hydraulic cylinder/piston unit 14 (cylinder II). At its lower end the hydraulic cylinder is pivotally connected to the supporting frame 13, and by means of a supporting means 15 the cylinder is
REFERENCES:
patent: 3545037 (1970-12-01), Anderson
patent: 3930284 (1976-01-01), Cook
patent: 4021883 (1977-05-01), Schmidt, Jr.
patent: 4127917 (1978-05-01), Pohio et al.
patent: 4164056 (1979-08-01), Hilgner et al.
patent: 4229860 (1980-10-01), Irwin
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