Knife Sharpening Device with 1-Point Bearing

Abstract

A knife sharpening device has two sharpening rods which are pivotally arranged on a base and arranged in a V-shape relative to one another to allow insertion of a knife therebetween. The sharpening rods each comprise at least one sharpening insert. The sharpening rods are held in a rest position at a predetermined distance from one another in their V-shaped arrangement by the force of a respective spring. The sharpening rods are spreadable apart in a sharpening position by insertion of the knife upon contact of the knife with the sharpening inserts against the force of the spring. The sharpening rods are held by a single holding point on the base.

Claims

1. A knife sharpening device comprising: at least two sharpening rods (24; 25), which are pivotably mounted on a base (2) and which are arranged in a V-shape relative to one another, wherein the V-shaped arrangement of the sharpening rods (24; 25) relative to one another serves for the insertion of a knife; wherein the sharpening rods (24; 25) each have at least one sharpening insert (30), the sharpening rods (24; 25) are being held in their V-shaped arrangement at a predetermined distance from one another in a rest position (19) by the force of a respective spring (29); the sharpening rods (24; 25) in a sharpening position (1) with insertion of the knife into the V-shaped arrangement of the sharpening rods (24; 25), can be spread apart against the force of the spring (29) upon contact of the knife with the sharpening inserts (30); and each sharpening rod (24; 25) comprises at least one grinding insert (26; 27) in extension of the sharpening insert (30), wherein the sharpening insert (30) and the grinding insert (26; 27) extend in a common plane (3) and extend at an angle to one another; and wherein a single holding point (42) is provided, via which the sharpening rods (24; 25) are held on the base (2).

2. The knife sharpening device according to claim 1, characterized in that the sharpening insert (30) is arranged in the region of the upper end (7) of the slot (6), on the sharpening rod (24; 25).

3. The knife sharpening device according to claim 1, characterized in that the sharpening insert (30) is arranged on the sharpening rod (24; 25) in the region of the lower end (8) of the slot (6).

4. The knife sharpening device according to claim 1, characterized in that the sharpening insert (26; 27) is made of one of hard metal, a hardened metal, sintered metal, ceramic, stone, and diamond.

5. The knife sharpening device according to claim 1, characterized in that the base (2) has a fastening device for fastening to a substrate, at an end facing away from the sharpening rods (24; 25).

6. The knife sharpening device according to claim 1, characterized in that a handle element (20) is arranged on at least one side of the base (2).

7. The knife sharpening device according to claim 1, characterized in that a pivot axis (22) is arranged for pivoting the sharpening rods (24; 25) at an angle to the base (2).

8. The knife sharpening device according to claim 1, characterized in that at least one sharpening rod (24; 25) is mounted movably relative to the base (2) via the single holding point (42).

9. The knife sharpening device according to claim 1, characterized in that the sharpening rod (24; 25) is designed as a protective body which protects the sharpening insert (30) from contact by the user and/or from damage and/or from contamination.

10. The knife sharpening device according to claim 1, characterized in that at least one guide element (10) is arranged on at least one side of the base (2), each guide element (10) having a slot (6) open at one end (7) and closed at the opposite end (8), the V-shaped arrangement of the sharpening rods (24; 25) and the slot (6) being axially aligned with one another.

11. The knife sharpening device according to claim 10, characterized in that the guide element (10) is constructed from a cut-resistant material.

12. The knife sharpening device according to claim 10, characterized in that the slot (6) in the guide element (10) has an exponentially increasing width from its closed end (8) to its open end (7).

13. The knife sharpening device according to claim 1, characterized in that the base (2) comprises a housing (4) in which the sharpening rods (24; 25) are held against each other and/or against the base (2) via the single holding point (42).

14. The knife sharpening device according to claim 13, characterized in that at least one discharge device (17) is provided on an inner wall (12) and/or on an outer side of the housing (4) of the base (2).

15. The knife sharpening device according to claim 13, characterized in that a trunnion (21) is arranged in the housing (4), on which at least one sharpening rod (24; 25) is rotatably mounted.

16. The knife sharpening device according to claim 13, characterized in that the housing (4) is designed as a protective body which protects the spring (29) arranged on the respective sharpening rod (24; 25) from contact by the user and/or protects against damage and/or soiling and/or against visibility.

17. The knife sharpening device according to claim 1, characterized in that the spring (29) is a compression spring or a tension spring.

18. The knife sharpening device according to claim 1, characterized in that one spring (29) is arranged on each sharpening rod (24; 25) respectively.

19. The knife sharpening device according to claim 1, characterized in that the spring (29) is a bending spring or a torque spring.

20. The knife sharpening device according to claim 1, characterized in that the restoring force of the spring (29) directed towards a center line (13) of the slot (6) changes during the transition of the sharpening rods (24; 25) from the rest position (19) to the sharpening position (1).

21. The knife sharpening device according to claim 1, characterized in that in the rest position (19) the distance between the two sharpening rods (24; 25) corresponds at most to the width of the slot in the base (2).

22. The knife sharpening device according to claim 1, characterized in that, in the sharpening position (1), one sharpening rod (24; 25) respectively contacts one side of the blade (60) of the knife with its sharpening insert (30).

23. The knife sharpening device according to claim 13, characterized in that the springs (29) are fixable in the housing (4) and are transferrable from the fixation in the rest position (19) into a sharpening position (1).

24. The knife sharpening device according to claim 1, characterized in that the sharpening insert (30) comprises at least one diamond and/or one ceramic and/or one stone.

25. The knife sharpening device according to claim 1, characterized in that the sharpening insert (30) has regions of different sharpening effect and/or sharpening intensity.

26. The knife sharpening device according to claim 1, characterized in that the sharpening rods (24; 25) and/or the sharpening inserts (30) and/or the base (2) and/or the springs (29) are each designed as exchange modules.

27. A sharpening insert for a knife sharpening device according to claim 1, characterized in that the sharpening insert (30) comprises a sharpening edge (31) and/or a honing edge (32) and/or a polishing surface (33).

28. The sharpening insert according to claim 27, characterized in that the sharpening edges (31) of the sharpening inserts (30) of the sharpening rods (24; 25) each face each other.

29. The sharpening insert according to claim 27, characterized in that the honing edges (32) of the sharpening inserts (30) of both sharpening rods (24; 25) face each other.

30. The sharpening insert according to claim 27, characterized in that the polishing surface (33) is a surface of the sharpening insert (30) which has end faces transverse to the longitudinal axis (34) of the sharpening insert (30), of which one end face is a sharpening edge (31) and the opposite end face is a honing edge (32) respectively.

Description

[0264] Further examples and embodiments of the invention are described in more detail with reference to the drawing.

[0265] Hereby show:

[0266] FIG. 1 shows a front view of the knife sharpening device looking into the housing,

[0267] FIG. 2 shows the knife sharpening device in front view, with sharpening rods in rest position,

[0268] FIG. 3 shows the knife sharpening device in side view with guide elements,

[0269] FIG. 4 shows the knife sharpening device in side view in an exploded view,

[0270] FIG. 5 shows in a sequence of images the honing process of a knife with the knife sharpening device,

[0271] FIG. 6 shows the sharpening insert with its working areas, and

[0272] FIG. 7 shows a lateral section of the sharpening insert.

[0273] FIG. 1 shows a knife sharpening device with a base 2 and a guide element 10 arranged on the upper side of the base 2.

[0274] The knife sharpening device is shown in front view in FIG. 1.

[0275] In the direction of view behind the guide element 10, two sharpening rods 24; 25 are arranged in FIG. 1.

[0276] A housing 4 of the base 2 is shown in FIG. 1.

[0277] The housing 4 comprises in each case a circumferential outer wall 14 and a circumferential inner wall 12. (See also FIG. 2)

[0278] A fastening device is arranged on the underside of the housing 4 of the base 2.

[0279] The fastening device shown in FIG. 1 is designed as a so-called vacuum plate.

[0280] A vacuum is generated between the vacuum plate of the fastening device and a substrate 46 by means of a lever 45 between the fastening device and the substrate 46, by means of which the knife sharpening device 11 can be fastened to the substrate 46 in a loss-proof manner. (See also FIG. 2)

[0281] A discharge device 17 extends along an inner wall 12 of the housing 4. The discharge device 17 is also shown in FIG. 2.

[0282] The discharge device 17 is used to discharge dirt particles and fluids that have entered an interior space 49 of the housing 4.

[0283] FIG. 1 shows that the ends 47 and 48 of the sharpening rods 24 and 25, respectively, project into the interior 49 of the housing 4.

[0284] The ends 47 and 48 of the sharpening rods 24 and 25 are each connected to the inner wall 12 of the housing 4 via springs 29.

[0285] In the example of FIG. 1, the springs 29 are each designed as compression springs.

[0286] The sharpening rods 24 and 25 are shown in FIG. 1 in a V-shaped arrangement 5 in a sharpening position 1.

[0287] In the sharpening position 1, the ends 47 and 48 of the sharpening rods 24 and 25 are pushed against the inner wall 12 of the housing 4. At the same time, the respective associated springs 29 of the circumferential inner wall 12 of the housing 4 are pushed together in the direction of the inner wall 12 of the housing 4, against the spring action.

[0288] Both sharpening rods 24 and 25 are held in the interior 49 of the housing 4 via the one single holding point 42 on the inner wall 12 of the housing 4 of the base 2.

[0289] A pivot axis 22, about which the sharpening rods 24 and 25 are pivotable relative to the housing 4 of the base 2, extends through a trunnion 21.

[0290] In the sharpening position 1 of the sharpening rods 24 and 25, the sharpening rods 24, 25 are shown in a V-shape 5.

[0291] The sharpening rods 24 and 25 are transferred from the rest position 19 (see FIG. 2) to the sharpening position 1 of FIG. 1 by a knife (not shown).

[0292] Each sharpening rod 24; 25 has at least one sharpening insert 30.

[0293] The knife blade 60 (not shown) is inserted at an open upper end 7, into the V-shaped arrangement 5 of the sharpening rods 24,25. Within the slot 6, the knife 60 is moved toward an opposite closed end 8.

[0294] By inserting the knife 60 toward the closed end 8 of the slot 6 of the guide element 10, the two sharpening rods 24 and 25 are spread apart against the force of the respective springs 29.

[0295] In FIG. 1, the V-shaped arrangement 5 of the sharpening rods 24 and 25 is approximately aligned with the slot 6 of the guide element 10 (see also FIG. 2).

[0296] In the longitudinal axis 34 behind the sharpening insert 30 (see FIG. 6), in the region of the lower end 8 of the slot 6, the blade 60 of the knife comes into contact with the sharpening inserts 26; 27 of the respective, opposing sharpening rods 24; 25.

[0297] In other words, the user introduces in particular a very blunt and worn blade of the knife 60, towards the lower end 8 of the slot 6 into the V-shaped arrangement 5 of the sharpening rods 24; 25.

[0298] Along the longitudinal axis 34 of the sharpening insert 30, but axially behind the sharpening inserts 30, the user brings the blade 60 (not shown) into contact with the carbide tips (grinding inserts 26; 27) of the, opposing sharpening rods 24; 25.

[0299] FIG. 2 corresponds essentially to FIG. 1, with the difference that the two sharpening rods 24 and 25 have been transferred to a rest position 19 with respect to the sharpening position 1 from FIG. 1.

[0300] In FIG. 2, the two sharpening rods 24 and 25 are aligned with two arms 50; 51 of the guide element 10 in the rest position 19.

[0301] In the interior 49 of the housing 4, the two ends 47 and 48 of the sharpening rods 24 and 25 rest against a movement limiter 52.

[0302] The movement limiter 52 fixes the two sharpening rods 24 and 25 in their rest position 19.

[0303] The springs 29 are designed as compression springs which, in the rest position of the sharpening rods 24 and 25, push off from the inner wall 12 of the housing 4 and press the sharpening rods 24 and 25 into the interior 49 of the housing 4.

[0304] The holding point 42 of the two sharpening rods 24 and 25 is arranged on the inner wall 12 of the housing 4.

[0305] The pivot axis 22 of the trunnion 21 extends along the longitudinal axis 53 of the trunnion 21.

[0306] FIG. 3 shows side views of the housing 4 of the base 2 with the sharpening rods 24 and 25 projecting from the housing 4.

[0307] In the illustrations of FIG. 3, guide elements 10 are arranged in side view.

[0308] The guide elements 10 each extend axially parallel to the sharpening rods 24 and 25.

[0309] At the ends of the sharpening rods 24 and 25, which are opposite the housing 4, the guide elements 10 are connected to each other by a bar 54 (cf. FIG. 3).

[0310] In the right-hand side views of FIG. 3, lever 45 is shown, which is associated with the fastening device.

[0311] The fastening device is used to fasten the housing 4 of the base 2 to the substrate 46.

[0312] FIG. 4 shows an exploded view of the knife sharpening device 11 with halves 56 and 57 of the housing 4.

[0313] The two halves 56 and 57 of the housing 4 form the interior 49 of the housing 4 when assembled (not shown).

[0314] At the upper sides of the two halves 56 and 57 of the housing 4, which face the sharpening rods 24 and 25, the halves 56 and 57 of the housing 4 each carry a guide element 10.

[0315] A bearing 58 and 59 are arranged on each of the inner walls 12 of the housing 4. The bearings 58 and 59 serve to hold the trunnions 21 of the sharpening rods 24 against the inner wall 12 of the housing 4.

[0316] The one single holding point 42 of the sharpening rods 24 and 25 to the housing 4 is formed by the two bearings 58 and 59 of the trunnion 21 to the housing 4.

[0317] The trunnion 21 is integrally connected to the sharpening rod 24.

[0318] With its long end, the trunnion 21 of the sharpening rod 24 protrudes through a through hole 15 of the sharpening rod 25.

[0319] The longitudinal axis 53 of the trunnion 21 forms the pivot axis 22 of the sharpening rods 24 and 25 relative to the housing 4 of the base 2.

[0320] With its through hole 15, the sharpening rod 25 is pushed onto and/or fastened to the trunnion 21 of the sharpening rod 24.

[0321] Depending on whether the two sharpening rods 24 and 25 are in a sharpening position 1 or in a rest position 19 relative to each other, the two sharpening rods 24 and 25 are pivoted relative to each other about the pivot axis 22 of the trunnion 21.

[0322] FIG. 5 shows in a sequence of images from a-f an operation in which a knife with a blade 60 is guided along inserts 30 of the sharpening rods 24 and 25 for honing the blade 60.

[0323] The illustrations a-f of FIG. 5 show the knife sharpening device according to the invention with the base 2 and the guide element 10, which is arranged in front of the sharpening rods 24 and 25 in the front view of the knife sharpening device 11.

[0324] The guide element 10 is arranged on the side of the housing 4 of the base 2 on which the sharpening rods 24 and 25 protrude from the interior 49 of the housing 4.

[0325] In position a, a blade 60 of a knife is inserted into the slot 6 at the upper end 7 of the slot 6.

[0326] In the process, the blade 60 is placed against a sharpening edge 31 of a sharpening insert 30 on each side.

[0327] By pressing the blade 60 in against the resistance of the spring 29 (not shown) arranged opposite one another in the housing 4, the sharpening rods 24 and 25 are guided from the rest position 19 (cf. position a) into the sharpening position 1 (illustrations b-f).

[0328] To hone the blade 60 of the knife, the blade 60 is guided further towards the lower end 8 of the slot 6 against the force of the springs 29, according to the illustrations b-e.

[0329] As the blade 60 moves toward the lower end 8 of the slot 6, the sharpening rods 24 and 25 are spread further apart against the force of the spring 29 (not shown).

[0330] In the following, a knife is assumed to have a blade 60 on one of its longitudinal sides.

[0331] The blade 60 is inserted into the slot 6 of the knife sharpening device in accordance with the illustrations a to d. With increasing pressure of the blade 60 of the knife against the sharpening rods 24; 25, the blade 60 of the knife is inserted deeper into the slot 6.

[0332] In the process, the sharpening rods 24 and 25 are transferred from the rest position 19 to the sharpening position 1 as the blade 60 is further inserted into the slot 6 of the guide element.

[0333] For sharpening, the blade 60 is inserted between the sharpening rods 24, 25 with the tip pointing downwards. Subsequently, the blade 60 of the knife is pulled through the knife sharpening device 11 with the tip lowered, from the rear to the front.

[0334] Subsequently, the blade 60 is polished. For polishing, the blade 60 is inserted between the sharpening rods 24 and 25 with the tip of the knife facing upwards. Against the pressure of the springs 29 (not shown), the blade 60 of the knife with the tip raised is guided from the rear to the front along the sharpening rods 24 and 25 of the knife sharpening device 11.

[0335] In another example, the blade 60 of the knife is a blade 60, with a side serrated edge.

[0336] By way of example, and in no way exclusively, it is assumed that the serrated edge is located on the right side of the blade 60 of the knife, as viewed from the back of the knife.

[0337] In order to also be able to sharpen and/or polish the serrated edge of the knife, the knife is inserted horizontally between the sharpening rods 24 and 25. At the same time, the blade 60 is pivoted in its horizontal orientation with its tip toward the side of the blade 60 that faces away from the serrated edge. When the blade 60 is guided horizontally along the sharpening rods 24 and 25 from back to front in this position, the side of the blade 60 on which the serrated edge of the knife is located is sharpened and/or polished.

[0338] FIG. 6. shows the sharpening insert 30, which is elongated and/or rod-shaped. The sharpening insert 30 is arranged on the surface 37 of the sharpening rod 24; 25 (not shown).

[0339] The sharpening insert 30 has a surface 35 that is flush with the surface 37 (not shown) of the sharpening rod 24; 25.

[0340] The sharpening insert 30 extends along the longitudinal axis of the sharpening rod 24; 25.

[0341] The sharpening rods 24; 25 (not shown) carrying the sharpening inserts 30 are arranged in a V-shape 5 to each other. The sharpening rods 24; 25 can be pivoted in opposite directions about the pivot axis 22.

[0342] When the sharpening rods 24; 25 are pivoted about the pivot axis 22, the two sharpening rods 24; 25 with the sharpening inserts 30 arranged thereon move radially in opposite directions.

[0343] The sharpening insert 30 comprises at least one surface 35, which is formed as a polishing surface 33. The polishing surface 33 is a plane and flat surface.

[0344] The polishing surfaces 33 are arranged on the sharpening inserts 30 in such a way that they move radially in opposite directions to one another when the sharpening rods 24; 25 are pivoted about the pivot axis 22.

[0345] To polish the knife, the blade 60 (not shown) is drawn horizontally through the sharpening rods 24; 25. Here, the bevel of the blade slides along the polishing surfaces 33 of the V-shaped sharpening rods 24; 25 on both sides.

[0346] When the blade is polished, the previously ground and/or honed bevel of the blade is polished. The blade 60 is additionally compacted and further sharpened by the polishing process.

[0347] Transverse to the longitudinal axis 34 of the sharpening insert 30, the surface 35 of the sharpening insert 30 has one end face on each side.

[0348] One end face is formed as a sharpening edge 31. The opposite end face forms a honing edge 32.

[0349] The sharpening edges 31 are arranged approximately at right angles to the pivot direction of the sharpening rods 24; 25 about the pivot axis 22. The sharpening edges 31 of the sharpening inserts 30 are arranged relative to the plate in such a way that the sharpening edges 31 of the sharpening inserts 30 of both sharpening rods 24; 25 face the plate.

[0350] The end face of the sharpening insert 30, which is formed as the sharpening edge 31, has an angle 38 relative to the surface 35 of the sharpening insert 30, which is approximately 88°.

[0351] It goes without saying that the end face formed as the sharpening edge 31 can also have a different angle relative to the surface 35 of the sharpening insert 30.

[0352] To sharpen the knife, the blade 60 (not shown) is drawn through the sharpening rods 24; 25 with the tip of the blade pointing downward. Here, the bevel of the blade 60 slides along the sharpening edges 31 of the V-shaped sharpening rods 24; 25 on both sides.

[0353] As the blade is sharpened, material is removed from the bevel of the blade 60 (not shown) as it is pulled through.

[0354] The honing edges 32 are arranged approximately perpendicular to the direction of pivoting of the sharpening rods 24; 25 about the pivot axis 22. The honing edges 32 of the sharpening inserts 30 are arranged relative to the plate such that the honing edges 32 of the sharpening inserts 30 of both sharpening rods 24; 25 face away from the plate.

[0355] The honing edge 32 is formed as a curved edge. The honing edge 32 may have a round or oval profiling 39. The honing edge 32 may also have another geometric shape.

[0356] The honing edge 32 has a profiling 39 at least in some areas. The profiling 39 has a roughened surface similar to a sandpaper. The profiling 39 comprises irregularities, preferably nubs and/or longitudinally or transversely extending grooves. It may also have any other geometric shape.

[0357] The honing edge 32 is made of a material that is harder than the material from which the blade of the knife is made.

[0358] To hone the knife, the blade is pulled through the sharpening rods 24; 25 with the tip of the knife pointing upwards. During this process, the bevel of the blade slides along the honing edges 32 of the V-shaped sharpening rods 24; 25 on both sides.

[0359] When the blade is honed, the steel chips or material threads remaining on the blade from the grinding process are removed from the blade of the knife.

[0360] Any unevenness on the blade remaining after the grinding process is leveled when the blade is pulled off.

[0361] FIG. 7 shows the sharpening insert 30 in lateral section according to FIG. 6.

[0362] The sharpening insert 30 has the surface 35, which is formed as a polishing surface 33. In the illustration of FIG. 7, the two end faces of the sharpening insert 30 are shown to the right and left of the surface 35 of the sharpening insert 30.

[0363] One end face is formed as a sharpening edge 31. The honing edge 32 is arranged on the opposite end face.

[0364] The sharpening edge 31 extends at an angle 38 of approximately 88° to the surface 35 of the sharpening insert 30.

[0365] The honing edge 32 is shown on the opposite end face. The honing edge 32 shown in FIG. 7 has a profiling 39 that includes grooves 40.

[0366] The honing edge 32 is arc-shaped and embedded in the sharpening insert 30.

[0367] To fix the sharpening insert 30 to the sharpening rod 24; 25, the sharpening insert 30 has a support 41.

REFERENCE NUMBERS

[0368] 1 Sharpening position [0369] 2 Base [0370] 3 Sharpening rod plane [0371] 4 Housing [0372] 5 V-shaped arrangement of sharpening rods [0373] 6 Slot [0374] 7 Upper end of slot [0375] 8 Lower end of the slot [0376] 9 Insertion area of the slot [0377] 10 Guide element [0378] 11 Knife sharpening device [0379] 12 Inner wall of the housing [0380] 13 Center line of the slot [0381] 14 Outer wall of the housing [0382] 15 Through holes of the sharpening rod [0383] 16 Partial trunnion [0384] 17 Discharge device [0385] 18 Loss prevention device [0386] 19 Rest position [0387] 20 Handle element [0388] 21 Trunnion of the sharpening rod [0389] 22 Pivot axis; trunnion [0390] 23 Side of the sharpening rod facing away from the guide element [0391] 24 Sharpening rod with trunnion [0392] 25 Sharpening rod [0393] 26 Grinding insert [0394] 27 Grinding insert [0395] 28 Remains free [0396] 29 Spring [0397] 30 Polishing insert [0398] 31 Sharpening edge [0399] 32 Honing edge [0400] 33 Polishing surface [0401] 34 Longitudinal axis of the sharpening insert [0402] 35 Surface of the sharpening insert [0403] 36 Remains free [0404] 37 Surface of the sharpening rod [0405] 38 Angle [0406] 39 Profiling [0407] 40 Grooves [0408] 41 Support of the sharpening insert [0409] 42 Holding points [0410] V-shape of the holding points [0411] 46 Substrate [0412] 47 End of the sharpening rod [0413] 48 End of the sharpening rod [0414] 49 Interior [0415] Arm of the guide element [0416] 51 Arm of the guide element [0417] 52 Movement limited [0418] 53 Longitudinal axis of the trunnion [0419] 54 Bar of guide element [0420] Link [0421] 56 Half of the housing [0422] 57 Half of the housing [0423] 58 Bearing [0424] 59 Bearing [0425] 60 Knife/blade of the knife [0426] 61 Fastening device