KNIFE SHARPENING DEVICE WITH HOLDING POINTS

Abstract

A knife sharpening device having a plate with two sharpening rods, which are mounted on the plate so that they can swivel. The plate has a slot, which is open at one end and closed at the opposite end. The arrangement of the sharpening rods and the slot are in axial alignment with each other and serve to insert a knife. The sharpening rods each have at least one sharpening insert. The sharpening rods are kept at a predetermined distance from each other in a rest position by the force of one spring in each case. The sharpening rods can be spread apart against the force of the spring in a sharpening position upon insertion of the knife when the knife comes into contact with the sharpening inserts. The plate has at least one point, at which at least one sharpening rod is held relative to the plate.

Claims

1. A knife sharpening device comprising: a plate with two sharpening rods, which are arranged on the plate so that they can swivel, wherein the plate has a slot, which is open at one end and closed at an opposite end; wherein the sharpening rods and the slot are arranged in axial alignment with each other and serve to insert a knife; wherein the sharpening rods each have at least one sharpening insert; wherein the sharpening rods are kept at a predetermined distance from each other in a rest position by a force of one spring in each case, and wherein the sharpening rods can be spread apart against the force of the spring in a sharpening position upon insertion of the knife when the knife comes into contact with the sharpening inserts, wherein the plate has at least one point, at which at least one sharpening rod is held on the plate.

2. The knife sharpening device according to claim 1, wherein the plate has three points, at which the sharpening rods are held relative to the plate.

3. The knife sharpening device according to claim 2, wherein the points, at which the sharpening rods are held on the plate, are arranged relative to each other in a V-shape.

4. The knife sharpening device according to claim 1, wherein at least one sharpening rod is movable at the point, at which it is held on the plate.

5. The knife sharpening device according to claim 2, wherein the plate has at least two points, each of which serves to hold the same sharpening rod.

6. The knife sharpening device according to claim 2, wherein the plate has at least two points, each of which serves to hold different sharpening rods.

7. The knife sharpening device according to claim 1, wherein the point in the plate is an oblong hole or a bore.

8. The knife sharpening device according to claim 1, wherein the plate has at least one grip element on at least one of two sides of the slot.

9. The knife sharpening device according to claim 1, wherein the plate has one bore on each side of the slot and the sharpening rod positioned in an area of the respective bore has a pin, by means of which the sharpening rod engages the bore.

10. The knife sharpening device according to claim 3, further comprising a bore that is an oblong hole.

11. The knife sharpening device according to claim 1, wherein the plate is composed of a cut-resistant material.

12. The knife sharpening device according to claim 1, wherein the slot in the plate has a width which increases exponentially from its closed end towards its open end.

13. The knife sharpening device according to claim 1, wherein the sharpening rod is configured in the form of a protective body, which protects the sharpening insert arranged on the respective sharpening rod against contact by a user and/or against damage and/or against visibility.

14. The knife sharpening device according to claim 1, wherein the sharpening rod is configured in the form of a protective body, which protects the spring arranged on the respective sharpening rod against contact by a user and/or against damage and/or dirt and/or against visibility.

15. The knife sharpening device according to claim 1, wherein one spring is arranged on one sharpening rod in each case.

16. The knife sharpening device according to claim 1, wherein the spring is a bending spring or a torsion spring.

17. The knife sharpening device according to claim 1, wherein the restoring force of the spring directed towards a centre line of the slot varies when the sharpening rods move from the rest position to the sharpening position.

18. The knife sharpening device according to claim 1, wherein the springs are fixed in a holding device and can be moved in this fixed state from a rest position to a sharpening position.

19. The knife sharpening device according to claim 1, wherein the sharpening insert comprises at least one diamond and/or one ceramic and/or one stone.

20. The knife sharpening device according to claim 1, wherein the sharpening inserts have areas of different sharpening effect and/or sharpening intensity.

21. The knife sharpening device according to claim 1, further comprising a swivel axis arranged approximately at right angles relative to the plate.

22. The knife sharpening device according to claim 1, wherein the sharpening rods and/or the sharpening inserts and/or holding device and/or the springs form a replacement module.

23. The knife sharpening device according to claim 1, wherein in the rest position, the distance of the two sharpening rods from each other corresponds at least to a width of the slot in the plate.

24. The knife sharpening device according to claim 1, wherein in the sharpening position, one sharpening rod in each case is in contact with one side of the knife with its sharpening insert.

25. The knife sharpening device according to claim 1, wherein the sharpening insert comprises a sharpening edge and/or a honing edge and/or a polishing surface.

26. The knife sharpening device according to claim 23, wherein sharpening edges of the sharpening inserts of both sharpening rods face the plate.

27. The knife sharpening device according to claim 23, wherein honing edges of the sharpening inserts (30) of both sharpening rods face away from the plate.

28. The knife sharpening device according to claim 23, wherein a polishing surface is a surface of the sharpening insert which has end faces extending transversely to a longitudinal axis of the sharpening insert, one end face of which is a sharpening edge and the opposite end face is a honing edge.

Description

DESCRIPTION OF THE DRAWINGS

[0206] Further examples and implementations of the invention are described in more detail with reference to the drawings, in which:

[0207] FIG. 1 shows an exploded view of the knife sharpening device,

[0208] FIG. 2 shows a side view of the knife sharpening device in its assembled state,

[0209] FIG. 3 shows the sharpening insert with its working areas, and

[0210] FIG. 4 shows a lateral sectional view of the sharpening insert.

DETAILED DESCRIPTION

[0211] FIG. 1 shows the knife sharpening device 11 with a plate 1, which is fastened approximately vertically to a stand 2.

[0212] The two sharpening rods 24; 25 are arranged in a plane 3, which extends approximately parallel to a plane 4 of the plate 1. The sharpening rods 24; 25 are shown in FIG. 1 in a V-shaped arrangement 5.

[0213] The plate 1 has a slot 6, which comprises an upper open end 7 and a lower closed end 8.

[0214] The slot 6 has an insertion area 9.

[0215] The insertion area 9 serves to insert a knife (not shown) into the slot 6 of the plate 1 between the sharpening rods 24; 25.

[0216] In order to delimit the slot 6 from the plate 1, the plate 1 has edges 10.

[0217] Reference numeral 10 indicates the edges of the slot 6 in the plate 1 of the knife sharpening device 11.

[0218] FIG. 1 shows a centre line 13 of the slot 6. In the area of the open end 7 of the slot 6, one oblong hole 14 is arranged in the plate 1 on each side (12) of the centre line 13.

[0219] In the area of the closed end 8 of the slot 6, a bore 15 is arranged in the plate 1, which has a circular diameter in FIG. 1.

[0220] The two oblong holes 14 each serve to receive one pin 16 of each sharpening rod 24; 25.

[0221] The pin 16 of the respective sharpening rod 24; 25 passes through the bore 14, which is configured in the form of an oblong hole. In order to hinge the two sharpening rods 24; 25 to the plate 1 in a captive manner, the pins 16 are protected on the rear side 17 of the plate 1 facing away from the sharpening rods 24; 25 preferably by a captive securing means 18 (not shown) to prevent them from slipping out of the oblong holes 14.

[0222] On both sides (12) of the centre line 13 of the slot 6, grip elements 20 are arranged on the plate 1.

[0223] A pin 21 is provided, which forms the swivel axis 22.

[0224] The pin 21 is provided on one side 23 of the sharpening rod 24 facing away from the plate 1.

[0225] The pin 21 penetrates a sharpening rod 25 arranged between the sharpening rod 24 and the plate 1.

[0226] The pin 21 penetrates a holding device 26.

[0227] For hinging the two sharpening rods 24; 25 and the holding device 26 to the plate 1, the pin 21 penetrates the plate 1. The pin 21 is held on the rear side 17 of the plate 1 facing away from the sharpening rods 24; 25 with a captive securing means 18 (not shown).

[0228] The sharpening rod 24 has a faceplate 28.

[0229] The holding device 26 serves as a carrier for the springs 29, which are not shown.

[0230] It is not shown either that the springs 29 are fastened to the sharpening rods 24 and 25 with their upper ends facing away from the holding device 26.

[0231] A sharpening insert 30 is arranged in the sharpening rod 24.

[0232] The sharpening insert 30 intended for replacement is shown in the area of the sharpening rods 24; 25.

[0233] FIG. 1 shows three points 42, 43, 44 of the plate 1, at which the sharpening rods 24; 25 are held on the plate 1.

[0234] The points 42, 43, 44 of the plate 1 are arranged relative to each other in a V-shape 45.

[0235] FIG. 2 shows the plate 1 of the knife sharpening device 11, which is arranged approximately vertically to the stand 2 on the latter.

[0236] The side view of the knife sharpening device 11 shows the holding device 26.

[0237] In the area of the open end 7 and the closed end 8 of the slot 6, the captive securing means 18 are shown. The pins 21; 16 are secured against slipping out of the bores 14; 15 by means of the captive securing means 18.

[0238] The pin 21 is arranged on the sharpening rod 24. The pin 21 passes through the sharpening rod 25. The pin 21 penetrates the holding device 26.

[0239] On the rear side 17 of the plate 1 facing away from the sharpening rods 24; 25, the pin 21 penetrates the bore 14; 15 in the plate 1. The pin 21 is held on the plate 1 with the captive securing means 18 so that it is captive and can be swivelled relative to the plate 1.

[0240] The sharpening inserts 30 are arranged in the sharpening rods 24 and 25.

[0241] The side view of FIG. 2 shows a spring 29.

[0242] FIG. 2 shows the spring 29 of the sharpening rod 24. At its lower end, the spring 29 is fastened to the holding device 26. At its upper end, the spring 29 is fastened to the sharpening rod 25.

[0243] The plate 1 extends in the plane 4. The plane 3, in which the sharpening rods 24 and 25 extend, runs parallel thereto.

[0244] FIG. 3. 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.

[0245] The sharpening insert 30 has a surface 35, which is flush with the surface 37 of the sharpening rod 24; 25.

[0246] The sharpening insert 30 extends along the longitudinal axis 36 of the sharpening rod 24; 25.

[0247] The sharpening rods 24; 25 (not shown) carrying the sharpening inserts 30 are arranged relative to each other in a V-shape 5. The sharpening rods 24; 25 can be swivelled in opposite directions around the swivel axis 22.

[0248] When the sharpening rods 24; 25 are swivelled around the swivel axis 22, the two sharpening rods 24; 25 with the sharpening inserts 30 arranged thereon move radially in opposite directions relative to each other.

[0249] The sharpening insert 30 comprises at least one surface 35, which is configured in the form of a polishing surface 33. The polishing surface 33 is a flat and plane surface.

[0250] The polishing surfaces 33 are arranged on the sharpening inserts 30 in such a way that when the sharpening rods 24; 25 are swivelled around the swivel axis 22, they move radially in opposite directions relative to each other.

[0251] For polishing the knife, the blade is pulled horizontally through the sharpening rods 24; 25. During this process, the bevel of the blade slides on both sides along the polishing surfaces 33 of the sharpening rods 24; 25 arranged in a V-shape.

[0252] Polishing the knife involves polishing the previously ground and/or honed bevel of the blade. As a result of the polishing process, the blade is additionally compressed and sharpened still further.

[0253] Transversely 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.

[0254] One end face is configured in the form of a sharpening edge 31. The opposite face forms a honing edge 32.

[0255] The sharpening edges 31 are arranged approximately at right angles relative to the swivel direction of the sharpening rods 24; 25 around the swivel axis 22. The sharpening edges 31 of the sharpening inserts 30 are arranged relative to the plate 1 in such a way that the sharpening edges 31 of the sharpening inserts 30 of both sharpening rods 24; 25 face the plate 1.

[0256] The end face of the sharpening insert 30 which is configured in the form of a sharpening edge 31 has an angle 38 of approximately 88 relative to the surface of the sharpening insert 30.

[0257] It is understood that the end face of the sharpening insert configured in the form of a sharpening edge 31 may also have a different angle relative to the surface 35 of the sharpening insert 30.

[0258] For grinding the knife, the blade is pulled through the sharpening rods 24; 25 with the point of the knife facing downwards. During this process, the bevel of the blade slides on both sides along the sharpening edges 31 of the sharpening rods 24; 25 arranged in a V-shape.

[0259] When the knife is ground, material is removed from the bevel of the blade as the blade is pulled through.

[0260] The honing edges 32 are arranged approximately at right angles relative to the swivel direction of the sharpening rods 24; 25 around the swivel axis 22. The honing edges 32 of the sharpening inserts 30 are arranged relative to the plate 1 in such a way that the honing edges 32 of the sharpening inserts 30 of both sharpening rods 24; 25 face away from the plate 1.

[0261] The honing edge 32 is configured in the form of a curved edge. The honing edge 32 can have a round or oval profile 39. The honing edge 32 can also have any other geometric shape.

[0262] The honing edge 32 has a profile 39 at least in some areas. The profile 39 has a roughened surface that resembles sandpaper. The profile 39 comprises irregularities, preferably nubs and/or grooves running lengthwise or crosswise. It can also have any other geometric shape.

[0263] The honing edge 32 is made of a material which is harder than the material of which the blade of the knife is made.

[0264] For honing the knife, the blade is pulled through the sharpening rods 24; 25 with the point of the knife facing upwards. During this process, the bevel of the blade slides on both sides along the honing edges 32 of the sharpening rods 24; 25 arranged in a V-shape.

[0265] When the knife is honed, the steel chips or threads of material remaining on the blade as a result of the grinding process are removed from the blade of the knife.

[0266] Any irregularities remaining on the blade after the grinding process are levelled when the blade is honed.

[0267] FIG. 4 shows a lateral sectional view of the sharpening insert 30 according to FIG. 3.

[0268] The sharpening insert 30 has the surface 35, which is configured in the form of a polishing surface 33. As illustrated in FIG. 4, the two end faces of the sharpening insert 30 are shown on the right and left of the surface 35 of the sharpening insert 30.

[0269] The one end face is configured in the form of a sharpening edge 31. On the opposite end face, the honing edge 32 is arranged.

[0270] The sharpening edge 31 extends at an angle 38 of approximately 88 relative to the surface 35 of the sharpening insert 30.

[0271] The honing edge 32 is shown on the opposite end face. The honing edge 32 shown in FIG. 4 has a profile 39 comprising grooves 40.

[0272] The honing edge 32 is arc-shaped and embedded in the sharpening insert 30.

[0273] For fixing the sharpening insert 30 to the sharpening rod 24; 25, the sharpening insert 30 has a carrier 41.

REFERENCE NUMERALS

[0274] 1 plate [0275] 2 stand [0276] 3 plane of the sharpening rod [0277] 4 plane of the plate [0278] 5 V-shaped arrangement of the sharpening rods [0279] 6 slot [0280] 7 upper end of the slot [0281] 8 lower end of the slot [0282] 9 insertion area of the slot [0283] 10 edges of the plate [0284] 11 knife sharpening device [0285] 12 side of the slot in the plate [0286] 13 centre line of the slot [0287] 14 oblong hole [0288] 15 bore [0289] 16 pin of the sharpening rod [0290] 17 rear side of the plate [0291] 18 captive securing means [0292] 19 rest position [0293] 20 grip element [0294] 21 pin of the sharpening rod [0295] 22 swivel axis; pin [0296] 23 side of the sharpening rod facing away from the plate [0297] 24 sharpening rod with pin [0298] 25 sharpening rod [0299] 26 holding device [0300] 27 remains unassigned [0301] 28 faceplate [0302] 29 spring [0303] 30 sharpening insert [0304] 31 sharpening edge [0305] 32 honing edge [0306] 33 polishing surface [0307] 34 longitudinal axis of the sharpening insert [0308] 35 surface of the sharpening insert [0309] 36 longitudinal axis of the sharpening rod [0310] 37 surface of the sharpening rod [0311] 38 angle [0312] 39 profile [0313] 40 grooves [0314] 41 carrier of the sharpening insert [0315] 42, 43, 44 holding point [0316] 45 V-shape of the holding points