Abstract
A knife includes a knife blade having a tang and an RFID transponder which is fixed to the tang. A knife handle surrounds the tang and the RFID transponder. The knife blade is produced from metal, in particular steel. The RFID transponder has an antenna and at least a portion of the antenna of the RFID transponder is constructed in a planar manner and is arranged parallel with a planar lateral face of the tang. In another embodiment, the antenna of the RFID transponder is galvanically connected to the tang. The knife having the RFID transponder increases the reliability of the reading by an RFID reading device.
Claims
1. A knife comprising: a knife blade having a tang; an RFID transponder which is fixed to the tang; and a knife handle which surrounds the tang and the RFID transponder; wherein the knife blade is produced from steel metal; wherein the RFID transponder has an antenna and at least a portion of the antenna of the RFID transponder is constructed in a planar manner and is arranged parallel with a planar lateral face of the tang; wherein the tang has one or more perforations which are engaged over by the antenna of the RFID transponder.
2. The knife according to claim 1, wherein the at least one planar portion of the antenna which is arranged parallel with the planar lateral face of the tang is arranged in front of the planar lateral face with a spacing of a maximum of 2 mm.
3. The knife according to claim 1, wherein the at least one planar portion of the antenna which is arranged parallel with the planar lateral face of the tang is arranged in front of the planar lateral face with a spacing of a maximum of 1 mm.
4. The knife according to claim 1, wherein all the portions of the antenna of the RFID transponder are constructed in the planar manner and arranged parallel with the planar lateral face of the tang.
5. The knife according to claim 4, wherein the antenna of the RFID transponder has two mutually galvanically separated antenna portions wherein the two portions of the antenna are arranged at mutually opposing planar lateral faces of the tang.
6. The knife according to claim 4, wherein the antenna of the RFID transponder has two mutually galvanically separated antenna portions wherein all the portions of the antenna are arranged at the same planar lateral face of the tang.
7. The knife according to claim 1, wherein at least a portion of the antenna of the RFID transponder projects beyond a rear end of the tang facing away from a cutting edge of the knife blade.
8. The knife according to claim 1, including a dielectric carrier disposed between at least a portion of the antenna and a portion of the tang.
9. The knife according to claim 8, including an additional metal substrate, the additional metal substrate being a metal foil or a metal plate, wherein the additional metal substrate is disposed between at least a portion of the dielectric carrier and a portion of the tang.
10. The knife according to claim 9, wherein the additional metal substrate engages under a portion of the antenna which projects beyond the tang.
11. The knife according to claim 9, wherein the additional metal substrate is galvanically connected to the tang.
12. A knife comprising: a knife blade having a tang; an RFID transponder which is fixed to the tang; and a knife handle which surrounds the tang and the RFID transponder; wherein the knife blade is produced from steel metal; wherein the RFID transponder has an antenna and the antenna of the RFID transponder is galvanically connected to the tang.
13. The knife according to claim 2, wherein the antenna of the RFID transponder has two mutually galvanically separated antenna portions, and only one of the antenna portions is galvanically connected to the tang, and wherein the antenna portions have a different capacitance and/or inductivity.
14. The knife according to claim 2, wherein at least a portion of the antenna of the RFID transponder is constructed in a planar manner and is arranged parallel with a planar lateral face of the tang.
15. A method for producing a knife according to claim 1, the method comprising the steps of: a) fixing the RFID transponder to the tang, wherein the at least a planar portion of the antenna of the RFID transponder is arranged parallel with the planar lateral face of the tang; and b) producing the knife handle by the tang and the RFID transponder being overmolded or cast-in with a plastics material using an injection-molding method.
16. The method according to claim 15, including the step of adhesively bonding the RFID transponder to the tang.
17. A method for producing a knife according to claim 12, the method comprising the steps of: a) fixing the RFID transponder to the tang, wherein the antenna of the RFID transponder is galvanically connected to the tang; and b) producing the knife handle by the tang and the RFID transponder being overmolded or cast-in with a plastics material using an injection-molding method.
18. The method according to claim 17, including the step producing a soldering contact between the antenna and the tang.
19. The method according to claim 17, including the step placing the antenna directly on the tang and then of applying and heating a ripple-finish paint or a heat-shrinkable sleeve which surrounds a portion of the antenna and the tang which presses the antenna and tang together.
20. A knife comprising: a knife blade having a tang; an RFID transponder which is fixed to the tang; and a knife handle which surrounds the tang and the RFID transponder; wherein the knife blade is produced from steel metal; wherein the RFID transponder has an antenna and at least a portion of the antenna of the RFID transponder is constructed in a planar manner and is arranged parallel with a planar lateral face of the tang; wherein at least a portion of the antenna of the RFID transponder projects beyond a rear end of the tang facing away from a cutting edge of the knife blade.
21. A knife comprising: a knife blade having a tang; an RFID transponder which is fixed to the tang; and a knife handle which surrounds the tang and the RFID transponder; wherein the knife blade is produced from steel metal; wherein the RFID transponder has an antenna and at least a portion of the antenna of the RFID transponder is constructed in a planar manner and is arranged parallel with a planar lateral face of the tang; wherein the at least one planar portion of the antenna which is arranged parallel with the planar lateral face of the tang is arranged in front of the planar lateral face with a spacing of a maximum of 2 mm; wherein the antenna of the RFID transponder has two mutually galvanically separated antenna portions, and only one of the antenna portions is galvanically connected to the tang, and wherein the antenna portions have a different capacitance and/or inductivity.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
(1) The invention is illustrated in the drawings and is explained in greater detail with reference to embodiments. In the drawings:
(2) FIG. 1a is a schematic side view of a knife blade with a tang for a knife according to the invention; wherein the tang has perforations;
(3) FIG. 1b shows the knife blade from FIG. 1a, with an RFID transponder which is completely fixed to a planar lateral face of the tang;
(4) FIG. 1c is a schematic cross-section through the knife blade of FIG. 1b in the plane of section Ic;
(5) FIG. 1d is a schematic longitudinal section through the knife blade of FIG. 1b in the plane of section Id;
(6) FIG. 1e shows an embodiment of a knife according to the invention, with the knife blade of FIG. 1b and with a cast knife handle;
(7) FIG. 2 is a schematic side view of a knife blade with a tang for a knife according to the invention, having an RFID transponder which is fixed to a planar lateral face of the tang and which projects beyond the end of the tang facing away from the cutting edge;
(8) FIG. 3a is a schematic side view of a knife blade with a tang for a knife according to the invention, having an RFID transponder which is fixed to a planar lateral face of the tang and which projects beyond the end of the tang facing away from the cutting edge, wherein the RFID transponder is arranged on an additional metal substrate;
(9) FIG. 3b is a schematic cross-section through the knife blade of FIG. 3a in the plane of section IIIb;
(10) FIG. 4a is a schematic side view of a knife blade with a tang for a knife according to the invention, having an RFID transponder which engages round the tang;
(11) FIG. 4b is a schematic top view of the knife blade of FIG. 4a in the arrow direction IVb;
(12) FIG. 5a is a schematic side view of a knife blade with a tang for a knife according to the invention, having an RFID transponder which is fixed to a planar lateral face of the tang and which projects beyond the end of the tang facing away from the blade, with the antenna positioned directly on the tang;
(13) FIG. 5b is a schematic side view of the knife blade of FIG. 5a, when viewed from the opposite side;
(14) FIG. 5c is a schematic cross-section through the knife blade of FIG. 5a in the plane of section Vc;
(15) FIG. 6a is a schematic side view of a knife blade with a tang for a knife according to the invention, with the tang being constructed without any perforations;
(16) FIG. 6b shows the knife blade from FIG. 6a, with an RFID transponder which is fixed to a planar lateral face of the tang and which projects beyond the end of the tang facing away from the cutting edge, wherein the antenna of the RFID transponder is galvanically connected to the tang by means of a soldering contact through a dielectric carrier;
(17) FIG. 6c is a schematic cross-section through the knife blade of FIG. 6b in the plane of section Vc;
(18) FIG. 6d shows another embodiment of a knife according to the invention, with the knife blade of FIG. 6b, and with a cast knife handle; and
(19) FIG. 7 is a schematic side view of a knife blade with a tang for a knife according to the invention, wherein an RFID transponder is fixed to an end of the tang remote from the cutting edge and the antenna of which is galvanically connected to the tang by means of a soldering contact.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
(20) FIGS. 1a to 1d illustrate a variant of a production according to the invention of an embodiment of a knife according to the invention, wherein at least a portion of the antenna of an RFID transponder is constructed in a planar manner and is arranged on a planar lateral face of the tang.
(21) FIG. 1a shows a knife blade 1 for the knife according to the invention. The knife blade 1 has a cutting edge 2 and also a tip 3 in this case; it should be noted that the front end of the knife blade 1 can also be constructed to be rounded (not illustrated) and the knife blade 1 can also be constructed to have two cutting edges (not illustrated). At the rear end of the knife blade 1 there is constructed a tang 5 which is arranged in the complete knife inside a knife handle (cf. in this regard FIG. 1e below). The knife blade 1, including the tang 5, is produced from an electrically conductive metal, in particular rust-resistant high-grade steel. In the embodiment shown, the tang 5 has a plurality of perforations (through-holes) 6a, 6b, 6c. Furthermore, there are provided in the tang 5 notches 7 which can be used for the handling of the tang 5 by machine.
(22) In the variant shown, an RFID transponder 8 is subsequently fixed to a planar lateral face 9 of the tang 5, in particular adhesively bonded, cf. FIG. 1b. The RFID transponder 8 has a chip 10 and a two-portion antenna 11 having meandering conductors which extend in a plane in this instance. In the example shown, the first portion 12a (on the left in FIG. 1b) of the antenna 11 and the second portion 12b (on the right in FIG. 1b) of the antenna 11 are constructed in a mirror-symmetrical manner; both portions 12a, 12b are connected to the chip 10, but are otherwise galvanically separated from each other.
(23) As can be seen in the cross-section of FIG. 1c and the longitudinal section of FIG. 1d, the RFID transponder 8 engages over the perforations 6a, 6b, 6c so that high-frequency radiation can also reach the lower side of the antenna 11 through the tang 5; however, the RFID transponder 8 does not project beyond the tang 5 (that is to say, the tang 5 overlaps the entire length of the RFID transponder 8). In the example shown, the RFID transponder 8 has a planar, layer-like dielectric carrier 13 (typically of plastics material), to which the antenna 11 and the chip 10 are applied (in particular imprinted thereon). The dielectric carrier 13 has a thickness D of typically 2 mm or less. The antenna 11 is electrically insulated from the tang 5 by the dielectric carrier 13; at the same time, the spacing AB which the antenna 11 (or the planar portions 12a, 12b thereof) has from the planar lateral face 9 of the tang 5 arranged in a parallel manner is adjusted.
(24) As a result of the spatial proximity of the tang 5 and the mutual orientation, the antenna 11 can couple well to the tang 5 or the entire knife blade 1 in an inductive and/or capacitive manner. The electromagnetic coupling can be finely adjusted by means of the thickness D and the material of the dielectric carrier 13 (in particular the dielectric constant thereof).
(25) Finally, as can be seen in FIG. 1e, the tang 5 together with the RFID transponder 8 is overmolded with a plastics material, whereby a knife handle 14 is formed (hidden elements are illustrated with broken lines in this case). As a result, a knife 30 according to the invention is produced. Typically, the knife 30 (or the cutting edge 2 thereof) is subsequently further ground.
(26) Where the subsequent embodiments and variants correspond to the illustrations of FIGS. 1a-1e, this is not mentioned particularly, but instead the differences are particularly explained in greater detail.
(27) FIG. 2 illustrates a knife blade 1 for the invention, wherein an RFID transponder 8 is fixed to the tang 5 in such a manner that only a first portion 15 of the antenna 11 of the RFID transponder 8 is arranged on a planar lateral face 9 of the tang 5; the remainder of the antenna 11 with the portions 20a, 20b projects beyond the end 16 of the tang 5 facing away from the cutting edge. That remainder of the antenna 11 is thereby accessible in a particularly effective manner for high-frequency radiation of an RFID reading device.
(28) FIG. 3a illustrates another knife blade 1 for the invention. In this case, the RFID transponder 8 also overlaps the tang 5 only with a portion 15 of the antenna 11, and the remainder with the portions 20a, 20b of the antenna 11 projects beyond the tang 5.
(29) In this instance, however, the RFID transponder 8 is arranged on an additional metal substrate 17 which is arranged between a dielectric carrier 13 and the tang 5, cf. FIG. 3b. The metal substrate 17 is constructed in this instance as a rigid metal plate of sheet steel. The metal substrate 17 engages under the RFID transponder 8 in particular in the region which projects beyond the tang 5 at the other side of the rear end 16, and in this case also in the overlap region with the tang 5. In the example shown, the metal substrate 17 is galvanically connected to the tang 5 because the metal substrate 17 is positioned directly on the tang 5. If desirable, the metal substrate 17 can be soldered on the tang 5.
(30) FIG. 4a illustrates a knife blade 1 for the invention, wherein an RFID transponder 8 is positioned in a saddle-like manner on the back of the tang 5 of the knife blade 1.
(31) As can also be seen in the top view of FIG. 4b, a first planar portion 18a of the antenna 11 (at the bottom in FIG. 4b) is arranged on a first planar lateral face 9 of the tang 5 and a second planar portion 18b (at the top in FIG. 4b) of the antenna 11 is arranged on a second planar lateral face 19 of the tang 5, wherein the second lateral face 19 is opposite the first lateral face 9. The chip 10 is positioned centrally on the back of the tang 5 and is connected to the two portions 18a, 18b of the antenna 11 in an electrically conductive manner.
(32) FIG. 5a shows a knife blade 1 for the invention, wherein an RFID transponder 8 with a portion (part) 21 of the antenna 11 thereof is directly positioned on the tang 5 and thereby directly produces a galvanic contact between the supported portion 21 and the tang 5. The remaining portion (part) 22 of the antenna 11 projects beyond the tang 5 at the other side of the rear end 16 of the tang 5. Since in FIG. 5a the antenna 11 is hidden by a dielectric carrier 13, the antenna 11 is indicated only with broken lines. The two portions 21, 22 do not have any electrically conductive connection (that is to say, are galvanically separated) but they are both connected to the chip 10 in an electrically conductive manner.
(33) FIG. 5b shows the knife blade 1 from the opposite side to FIG. 5a, wherein the portion (part) 21 of the antenna 11 is hidden by the tang 5 and is therefore again illustrated with broken lines. It should be noted that in this instance the portion 21 of the antenna 11 is constructed to be far shorter than the portion 22 of the antenna 11. As a result of an unequal division of the antenna 11, it can be adapted to a desired frequency (also with regard to the coupling to the tang 5, which is galvanic here).
(34) FIG. 5c, which is a cross-section through the knife blade 1 in the region of the planar portion (part) 21 of the antenna 11, which portion is positioned on the planar lateral face 9 of the tang 5, shows the direct contact between the antenna 11 and the tang 5; the dielectric carrier 13 on which the antenna 11 is arranged faces away from the tang 5. In order to press the antenna 11 permanently on the tang 5, a ripple-finish paint 23 which is coated around the tang 5 and the RFID transponder 8 in the region of the portion 21 can be used. The ripple-finish paint 23 contracts after heating and is thereby placed under resilient tensile stress, whereby the antenna 11 is urged onto the tang 5. In place of a ripple-finish paint 23, it is also possible to use a jacket made from a heat-shrinkable sleeve which is drawn over the RFID transponder 8 and the tang 5 in the overlap region thereof and heated.
(35) FIGS. 6a to 6d illustrate a variant of a production according to the invention of an embodiment of a knife according to the invention, wherein a galvanic contact is produced between the antenna of an RFID transponder and a tang via a soldering location 24.
(36) FIG. 6a first illustrates a knife blade 1 having a cutting edge 2 and a tang 5, with which a knife according to the invention is produced according to the invention. In this instance, the tang 5 has notches 7 for simple machine engagement, but not perforations in this instance.
(37) An RFID transponder 8 is now fitted to the tang 5, cf. FIG. 6b, wherein the region of a planar portion (part) 21 of an antenna 11 of the RFID transponder 8 is arranged and fixed, in particular adhesively bonded, on a planar lateral face 9 of the tang 5. It should be noted that the portion 21 of the antenna 11 has, as a result of a substantially shorter length, a different inductivity and capacitance from the portion (part) 22 which projects with respect to the tang 5 at the other side of the rear end 16 thereof. The portions 21 and 22 of the antenna 11 are galvanically separated from each other (that is to say, not connected to each other in an electrically conductive manner) but both connected to the chip 10 of the RFID transponder 8.
(38) A dielectric carrier 13 of the RFID transponder 8 has an opening in which there is arranged a measure of soldering tin which connects as a soldering contact 24 the antenna 11 at the outer end of the portion (part) 21 to the tang 5 in an electrically conductive manner, as can be seen in the cross-section of FIG. 6c. The tang 5 or the entire knife blade 1 thereby effectively extends the portion 21 of the antenna 11. As a result of the overlap of the antenna 11 in the portion 21 with respect to the tang 5, the antenna 11 is also further electromagnetically coupled to the tang 5, which can be used for fine adjustment of the resonances in the RFID transponder 8. In this case, in particular also the thickness D of the dielectric carrier or the spacing AB of the planar antenna portion 21 from the planar lateral face 9 of the tang 5 can be selected in a selective manner.
(39) The tang 5 together with the RFID transponder 8 is subsequently overmolded with plastics material in order to produce a knife handle 14 for the knife 31 according to the invention, cf. FIG. 6d. The portions covered by the knife handle 14 are again illustrated with broken lines.
(40) FIG. 7 illustrates a knife blade 1 for the invention, in which the RFID transponder 8 is not fixed to a planar lateral face 9 of the tang 5, but is instead subsequently fixed to the tang 5 at the rear end 16 of the tang 5 facing away from the cutting edge, for example, by adhesive bonding. A galvanic coupling in this instance is achieved with a soldering contact 24 between a front portion (part) 25a of the antenna 11 and the tang 5. The rear longer portion (part) 25b of the antenna 11 is galvanically separated from the front portion 25a, wherein both portions 25a, 25b are, however, electrically connected to the chip 10.
(41) A knife according to the invention may in particular be constructed as a boning knife. Knives according to the invention are in particular used in food product processing facilities, in particular slaughterhouses, and read with RFID reading devices. RFID reading devices can be configured in particular at cleaning stations, disinfection stations, storage stations, room entrances and/or room exits.
