elements 12 slide along the outside of the rails 6 8 and 10 and they have a foot 16 which projects inwards between the rails 6 8 and 10 and is provided with a guide collar 18 for defining the position of each supporting element 12 in the transverse direction relative to the rails 6 8 and 10 the feet 16 are interconnected by means of a chain 20 which is guided around a sprocket 22 which in turn is driven in a manner not shown in any further detail by means of a shaft 24 the supporting elements 12 can thus be moved along the rails 6 8 and 10 at regular intervals from each other in the direction of the arrow 14 the device rests by means of legs 26 on a plate 28 which is placed on a floor 30 the supporting elements 12 conveyed along the legs 26 are ready for receiving a front half of a slaughtered bird on each of them the front halves are then conveyed along the rails 8 at the top side of the device for filleting the front half the supporting elements 12 in this case pass in succession a hook operating.