Patent ID: 6901850

Claim:
A head having multiple retractable needles applicable for injecting in meat pieces fluid substances such as brine, proteins, phosphates or similar products in a solution, designed for an uprightly up and down run comprising: a distributing chamber connected to means for supplying under pressure such fluid substance to be injected coming from a tank thereof; a plurality of spaced injection needles ( 4 ) each of which having a penetration point ( 14 ), an internal axial passageway ( 12 ) communicated with at least an injection hole ( 15 ) close to the said penetration point ( 14 ), a length ( 4 a ) of the needle ( 4 ) extending through the said distribution chamber with possibility of guided slide and a end ( 18 ) distal from the penetration point ( 14 ) provided with an insertion limiting stop ( 17 ) which end ( 18 ) remains facing elastic retaining means which allow the needle back motion in the event it finds bone in the piece to be injected; and means for establishing a communication between such distribution chamber and said needle internal axial passageway ( 12 ); characterized in that: such distribution chamber comprises a plurality of elongated, parallel, intercommunicated ducts ( 3 ) through which the said lengths ( 4 a ) of the needles ( 4 ) can slide, such ducts ( 3 ) having a diameter wider than such lengths ( 4 a ) determining annular chambers and means ( 5 ) are arranged for sealing and guiding-centering such lengths ( 4 a ) close to the inlet and outlet of each duct ( 3 ); such needles ( 4 ) comprise at least a hole ( 13 ) communicating with such axial passageway ( 12 ), such hole ( 13 ) being located in an area of such length ( 4 a ) at a distance of the said stop ( 17 ) equivalent to approximately the length of related duct ( 3 ) such hole ( 13 ) remaining positioned , which is at least one, in a lifted position of the head, prior to the injection, close to the lower end of related duct ( 3 ), so that it is always communicated within it during the guided displacement of the needle ( 4 ), allowing the access of such fluid to be injected within the said passageway ( 12 ) wherever the back motion level of the needle ( 4 ) could be; and in an area ( 4 b ) immediately close to the axial penetration point of each injection needle ( 4 ) there exists a plurality of holes ( 15 ) through which the injection is performed when the head is fully lowered and each needle is stuck in the meat product.