EP1304191A2 - Device for treating a knife's cutting edge - Google Patents

Abstract

Each sharpening bar (3, 3) is rigidly secured at its pivot axis (7, 7) to the axle for a weight that weighs the same as or less than the excentral disc(s) (8, 8) connected with the bar. A spring (13, 13) applies a radial force to the disc at a point in the region of a cross-over point (starting position) (16) at the outer end of the slot. The radius between this point and the excentral axis (7, 7) is less than the radius for the point where the spring contacts the excentral disc in the region of a cross-over point at the inner end of the slot. <??>The device has a base plate (10 with a slot (2) for guiding the blade against spring-loaded, intersecting sharpening bars on either side of the slot. The blade is urged against the bar intersect point. An Independent claim is also included for a second knife sharpening and polishing device, comprising a base plate with a slot for guiding the blade against spring-loaded, intersecting sharpening bars on either side of the slot, where each bar is rigidly secured at its pivot axis to a hub, from which an elastically resilient protrudes so that its free end is in contact with a stop (29, 29) formed by a bolt.

Description

The invention relates to a device for treatment (Sharpening or polishing) a cutting edge of a knife with a provided in a base plate, open to the outside Slit for guiding the knife blade and with against an elastic resilient return force on each side of the slot pivoted, crossing in the area of the slot Treatment rods at the intersection of which the knife edge can be created.

In a known device of this type according to the US PS 4,934,110 is the restoring force for the treatment rods generated by a coil spring, one end of which at the Base plate is attached and the other end at the end of one Arm of a two-armed lever attacks on the other A treatment rod is rigidly attached to the arm and around a bolt fastened in the base plate is pivotally mounted is. In this known device, the axial deflection the coil spring when the crossing point of the treatment rods along the slot in the base plate from the outside migrates inwards, relatively large, so that the im Intersection forces acting on the knife edge Are essentially dependent on the spring characteristic and themselves therefore can change to an undesirable extent. Want but if you want the spring characteristic to be as flat as possible, this is required this is a relatively long coil spring and thus one large base plate, which leads to a bulky device. One has tried the angle at which the treatment rods on the knife edge during the movement along the slot by a corresponding curvature of the treatment rods about to keep the influence of the spring characteristic on the knife edge at the intersection it was not possible to completely apply the forces eliminate. Also shows the above-mentioned US-PS 4,934,110 a device in which the treatment rods return Force not by a spring, but by weights is produced. This device is heavy and can only be used in used in a position in which the weights be moved by gravity.

The invention has for its object one as possible to develop a light and handy device in which the the forces acting on the knife edge during the movement of the crossing point remain as constant as possible.

This object is achieved according to the invention in that each treatment rod rigid on its pivot axis with the Axis a lighter or equal weight than that or the eccentric disk having the treatment rods connected is at the one a radial on the eccentric directional spring force generating spring element attacks in such a way that at in the area of the outer end of the slot standing crossing point (starting position) the spring element at one point of the eccentric disc attacks its radius to the eccentric axis is less than the radius of the point of the spring element on the eccentric in the area of the inner end of the slot attacks the crossing point.

By using an eccentric disk in the force path between the pivot axis of the treatment rods and the spring element can the deflection of the spring element by the Choice of the eccentricity of the eccentric disc arbitrarily small must be chosen, however, this eccentricity must still be be so large that the one attacking the eccentric disc Spring element generates a restoring force that the treatment rods swings back to its starting position when the Knife blade is pulled out of the slot. As eccentric discs light panes can be chosen for no resetting of the treatment rods is possible alone. The invention enables the construction of a lightweight handy Device that the user e.g. also on his apron can hang.

In embodiments of the invention, the spring element on Extent of the eccentric disc or within its circumference attack on an arcuate contact surface. In the latter This can fall within the circumference of the eccentric disc running contact surface be the bottom of a groove, which is recessed in the circumference of an eccentric disc. At this Embodiments of the invention then prevent the flanks the groove a sliding of the spring element from the contact surface. However, this contact surface can also be a rib the eccentric disk can be provided so that the spring element is guided on one side. In embodiments of the Invention can the eccentric in the area of the contact surface also worn shoulder-shaped for the spring element be so that the contact surface is formed by this shoulder is and the spring element in turn on one side through the Side surface of the eccentric disc against sliding off the contact surface is secured. This embodiment can the invention to be further developed in such a way that another disc on the side surface of the eccentric disc is attached, the spring element on the eccentric opposite side leads.

The spring element can be used in embodiments of the invention be differently trained. In one embodiment of the Invention, the spring element is formed in that the Circumference of one attached to the base plate with both ends cylindrical coil spring tangential, if necessary under pressure against the eccentric disc. The Coil spring is then due to the eccentricity of the eccentric disc deflected laterally against the spring force of the coil spring, this deflection generates the restoring force, which returns the treatment rods to the starting position, when the knife blade comes out of the slot of the device is pulled out. It may be the location of greater eccentricity the eccentric disc during the lateral deflection the coil spring on the circumference of the coil spring slide along, it is convenient if a coil spring with close to each other and possibly under tension adjacent turns is used.

In another embodiment of the invention is as a spring element a leaf spring is provided, one end of which, for example is rigidly attached to the base plate, whereas the free end of which engages the eccentric disc, whereby it again either on the circumference of the eccentric disc or on abuts a contact surface running within its circumference.

In a further embodiment of the invention as Spring element uses a spring wire which, like the one mentioned above Coil spring rests on the eccentric disc.

In all of the aforementioned embodiments of the spring element this will only be the case with the movement of the treatment rods at most to the extent of the eccentricity of the eccentric disc deflected, but not by the dimension of the angle of rotation and thus not by the extent of the pivoting movement of the treatment rods deflected so that the device is overall proportionate can be made small.

However, the object of the invention can also be achieved by an embodiment be solved of the invention in which each treatment rod rigidly connected to a hub on its swivel axis is, the circumference of an elastic spring arm radially protrudes, the free end of a stop in the Base plate rests. This arm then acts like a leaf spring. Is the crossing point of the treatment rods in the area the inner end of the slot, this is the spring arm tense or more tense than in the starting position the treatment rods and causes when removing the knife blade the pivoting back of the treatment rods from the slot in their starting position.

This embodiment of the invention can go further be formed that the resilient arm in one piece connected to the hub and the arm and hub out Plastic exist and therefore an inexpensive to manufacture Form plastic injection part.

In embodiments of the invention, the spring element exchangeable or removable attached to the base plate be so that the cleaning of the device and the spring element is relieved.

The advantage of the light weight of the device and its Simple manufacture can be improved by the following features become.

The base plate can be an injection molded part made of plastic or Be made of light metal. You can do this on the base plate known stops for the pivoting movement the treatment rods are molded. Also in embodiments the invention on the base plate fasteners be molded for the spring element, for example Bolt for hanging a coil spring or like. The base plate can also be used as an injection molded part manufactured inexpensively from an ergonomic point of view become.

Finally, handling the device is made easier by that recesses are provided in the base plate, which is used as a handle for pushing fingers through the hand can be. Also, the swivel bearings for the Treatment rods, e.g. Cutouts for the hubs on which the treatment rods are already attached in the base plate be provided when spraying the base plate.

Finally, the use of the device according to the invention even easier that at least in the base plate a recess is provided for attaching the device serves on a pad. In embodiments the invention, for example, a recess, preferably a dovetail cutout on the edge of the Be base plate, with which the device on a corresponding Holding part can be pushed onto a base.

The treatment rods can pass through the base plate Be attached hub, on the end of which the eccentric disc is rotatably attached. This attachment can Embodiments of the invention can be implemented that the hub has at least one radial opening, through which one end of the treatment rod can be passed is. This creates a rotationally fixed connection between the treatment rod and guaranteed via the hub with the eccentric disc.

The treatment rods can be interchangeably connected to the hub be so that treatment rods for polishing as needed or to sharpen the knife edge with the hub can be connected. Finally, treatment sticks can also be used connected to the hub serving as a pivot pin be a section for polishing in a known manner the knife edge and a section for sharpening of the knife edge.

Further features of the invention result from the following Description of embodiments of the invention in conjunction with the claims and the drawing. The single ones Features can be used individually or in several embodiments the invention can be realized.

Fig. 1

eine rückseitige Ansicht des Gerätes mit den Behandlungsstäben in ihrer Ausgangsstellung;

Fig. 1a

einen vergrößerten Ausschnitt aus Fig. 1;

Fig. 2

die in Figur 1 dargestellte Ansicht des Gerätes, bei der sich der Kreuzungspunkt der beiden Behandlungsstäbe im Bereich des inneren Endes eines Schlitzes zur Führung einer Messerklinge befindet;

Fig. 3

eine Ausführungsform des Gerätes von der Rückseite gesehen ohne Exzenterscheibe mit einem elastischen Arm als Federelement; links der Bildmitte die Ausgangsstellung, rechts der Bildmitte die Endstellung eines Behandlungsstabes;

Fig. 4

das bei der Ausführungsform nach Fig. 3 verwendete Federelement und die damit verbundene Nabe eines doppelt ausgeführten Behandlungsstabes;

Fig. 5

eine Bewegung des in Figur 4 dargestellten elastischen Armes in Draufsicht; und

Fig. 6

eine perspektivische, rückseitige Ansicht einer als Spritzteil ausgeführten Grundplatte.

In the drawing, the parts of two embodiments of the invention required to understand the invention are shown. It shows:

Fig. 1

a rear view of the device with the treatment rods in their starting position;

Fig. 1a

an enlarged section of Fig. 1;

Fig. 2

the view of the device shown in Figure 1, in which the crossing point of the two treatment rods is in the region of the inner end of a slot for guiding a knife blade;

Fig. 3

an embodiment of the device seen from the back without an eccentric disc with an elastic arm as a spring element; to the left of the center of the picture the starting position, to the right of the center of the picture the end position of a treatment rod;

Fig. 4

the spring element used in the embodiment of Figure 3 and the associated hub of a double treatment rod.

Fig. 5

a movement of the elastic arm shown in Figure 4 in plan view; and

Fig. 6

a perspective, rear view of a base plate designed as a molded part.

In the embodiment of the invention shown in FIGS. 1 and 2 , a base plate 1 has an outwardly open slot 2 , into which a knife blade for sharpening or polishing is inserted from top to bottom in the drawing. Treatment rods 3, 3 ' are pivotally mounted on the rear view of the base plate 1 in the illustrated view in hubs 4, 4' designed as pivot bolts in recesses 5, 5 'of the base plate 1 and a tab 6, 6' provided for reinforcing the walls of the recess , The hubs 4, 4 'have an axle bolt 7, 7' which passes through the cutout 5, 5 'and on which an eccentric disc 8, 8' arranged on the drawn back is eccentrically and rigidly fastened. The hubs 4, 4 'have a groove 9, 9' along their circumference, into each of which the upper end of the treatment rods 3, 3 'in the drawing is inserted. The hubs have at least one radial through bore 10, 10 ' , through which the U-shaped bent ends of the treatment rods 3, 3' are inserted, so that they are connected to the hub 4, 4 'in a rotationally fixed manner. The U-shaped bend 11, 11 'of the upper end of the treatment rods 3, 3' can be designed such that the section of the treatment rods 3, 3 'adjoining this bend 11, 11' lies firmly in the groove 9 by a clamping action. The bend 11, 11 'can, however, also be designed such that the treatment rods 3, 3' in FIG. 1 can be pushed upwards out of the bores 10, 10 'and cleaned or replaced separately.

The eccentric disc 8 is fastened at a distance from the base plate 1 on the axle bolt 7, 7 '. On the inside of the eccentric disc 8, 8 'facing the base plate 1, a rib 12 is fastened, preferably injection-molded, which runs parallel to the circumference within the circumference of the eccentric disc 8, 8' and forms an arcuate contact surface for a spring element 13, 13 ' . In the embodiment of the invention shown in FIG. 1, this spring element 13, 13 'is formed by a cylindrical helical spring 13, 13', which is fastened at both ends to retaining bolts 14, 14 ' and 15, 15' fastened in the base plate 1. In the starting position of the treatment rods 3, 3 'shown in FIG. 1, the spring element 13, 13' rests under tension at a point on the rib 12 which only slightly presses the straight course of the cylindrical helical spring 13, 13 'outwards. There is a crossing point 16 of the two treatment rods 3, 3 'still in the vicinity of the upper, outer end of the slot 2 (starting position). If a knife blade is inserted into the slot 2, the treatment rods 3, 3 'are swung out, so that the crossing point 16, as shown in FIG. 2, comes to lie in the region of the lower end of the slot 2. The eccentric disc 8, 8 'pivots about its axle pin 7, 7' to such an extent that the spring element 13, 13 'comes to rest on a section of the rib 12 whose radius to the axle pin 7, 7' is greater than the radius of the contact point 1 at the upper crossing point 16. In the position shown in FIG. 2, the rib 12 presses the spring element 13, 13 'much more outwards than in the starting position shown in FIG. 1. The spring element 13, 13 'in FIG. 2 endeavors to turn the eccentric disc 8, 8' back into the starting position shown in FIG. 1, so that the treatment rods 3, 3 'swivel back into the starting position shown in FIG. 1 with the upper crossing point 16.

In the embodiment of the invention shown in FIGS. 3 to 5, instead of an eccentric disc 8, 8 'and a helical spring 13, 13' acting on it, with the hub 4, 4 'or its axle bolt 7, 7', there is a second hub 17, 17 'non-rotatably connected, from the circumference of which an elastically resilient arm 18, 18' protrudes. The free end of this arm 18, 18 ', as shown in FIG. 3, can only be supported resiliently on a stop pin 19 or, as shown in FIG. 5, can engage between two pins 20 and 21 which, like the stop pin 19, engage in the base plate 1 are arranged. The hub 17, 17 'and the arm 18, 18' can be molded in one piece from plastic. As FIG. 3 shows, the arm 18, 18 ', which acts like a leaf spring, is only slightly tensioned in the starting position of the treatment rods 3, 3' (FIG. 5 shown in solid lines), whereas it is tensioned much more in the end position of the treatment rods 3, 3 '(bent ), which is shown in dashed lines in Figure 5. The rotationally fixed connection of the hub 17, 17 'to the hub 4, 4' can be designed to be detachable, so that in this embodiment of the invention as well, the device parts arranged on the front of the base plate 1 and on the rear side of the base plate 1 for cleaning or can be removed from the device for replacement.

The embodiment shown in Figures 3 to 5 Invention has the advantage that it has a particularly simple structure is.

FIG. 4 shows an embodiment in which one side of the slot 2 parallel, at a distance from each other arranged treatment rods 3 are provided, wherein one or two on the other side of the slot 2 provided treatment rods 3 'between these treatment rods 3 intervene. The treatment rods 3, 3 'are in the In the embodiment shown in Figures 3 to 5 in the fixed in the same way in the hubs 4, 4 'as in the embodiment according to FIGS. 1 and 2.

The base plate 1, which can be made of plastic or light metal, has cutouts 22, 22 ' which are used for handling the device and through which fingers of the hand can be inserted. The walls of the recesses 22, 22 'are reinforced by sleeve sections 23, 23' , which in turn are additionally held by a rib 24, 24 ' , which leads to the edge of the base plate 1 and there with a raised, board-like protrusion extending at the edge of the base plate 1 Rib 25, 25 'are connected (Figures 1, 2, and 6). The edges of the slot 2 are also protected and reinforced by ribs 26 protruding from the base plate 1. At the lower end of the base plate in FIGS. 1, 2 and 6 there is a dovetail-shaped recess 27 ' which can be used for fastening, for example pushing the device onto a corresponding holding part of a base.

Further recesses 28, 28 ' in the base plate 1 (FIGS. 1, 2 and 6) serve to reduce the weight of the device and also to grip fingers of the hand when holding the device. In embodiments of the invention, stops 29, 29 ' (FIG. 3) for the treatment rods 3, 3' in the starting position can also be provided in the base plate 1, so that this starting position is always defined.

The invention relates to a device for sharpening or polishing the cutting edge of a knife with a in a base plate 1 provided, open to the outside slot 2 in which the knife blade can be performed and with against an elastic resilient restoring force on each side of the slot 2 pivoted, intersecting in the area of the slot 2 Treatment rods 3, 3 ', at their crossing point 16 the knife edge can be applied. Each treatment rod 3, 3 ' is rigid on its pivot axis 7 with the axis of an eccentric disc 8, 8 'connected to which a radially the eccentric disc 8, 8 'generating directional spring force Spring element 13, 13 'attacks in such a way that in the area of the outer end of the slot 2 standing intersection 16 (starting position) the spring element 13, 13 'on one Place of the eccentric 8, 8 'attacks, the radius of Eccentric axis 7, 7 'is less than the radius of the point, on which the spring element 3, 3 'at in the region of the inner end the slot 2 attacks the crossing point 16, or it is with the axle pin 7 of a treatment rod 3, 3 'an elastically resilient arm rotatably connected, the free end itself at a stop 19, 20, 21 in the base plate 1 supports.

Claims (20)

Device for treating the cutting edge of a knife with a slot (2) provided in a base plate (1), which is open to the outside, for guiding the knife blade and with an elastically resilient restoring force on each side of the slot (2), which is pivoted in the region of the Slit (2) crossing treatment rods (3, 3 '), at the crossing point (16) of which the knife edge can be placed,
characterized in that each treatment rod (3, 3 ') is rigidly connected on its pivot axis (7) to the axis of an eccentric disc (8, 8') having a lower or the same weight than the treatment rod (s, 3, 3 '), which is engaged by a spring element (13, 13 ') which generates a spring force directed radially onto the eccentric disc (8, 8') in such a way that when the point of intersection (16) (starting position) is in the region of the outer end of the slot (2), the spring element ( 13, 13 ') at a point on the eccentric disc (8, 8') whose radius to the eccentric axis (7, 7 ') is smaller than the radius of the point at which the spring element (3, 3') on the eccentric disc ( 8, 8 ') when the point of intersection (16) is in the region of the inner end of the slot (2). Device according to claim 1, characterized in that the spring element (13, 13 ') acts on the circumference of the eccentric disc (8, 8'). Device according to claim 1, characterized in that the Eccentric disc (8, 8 ') within its circumference arcuate contact surface for the spring element (13, 13 '). Apparatus according to claim 3, characterized in that the contact surface provided within the circumference of the eccentric disc (8, 8 ') is formed by the bottom of a groove provided in the circumference of the eccentric disc. Apparatus according to claim 3, characterized in that the contact surface provided within the circumference of the eccentric disc (8, 8 ') is formed by a rib (12) placed laterally on the eccentric disc (8, 8'). Device according to one of claims 1 to 5, characterized in that the spring element (13, 13 ') is formed in that the circumference of a cylindrical helical spring (13, 13') fastened to the base plate with its two ends is tangential, possibly under pressure , bears on the eccentric disc (8, 8 '). Device according to one of claims 1 to 5, characterized in that a leaf spring is provided as the spring element, which rests on the eccentric disc (8, 8 '). Device according to one of claims 1 to 5, characterized in that a spring wire is provided as the spring element. Device for treating the cutting edge of a knife with a slot (2) provided in a base plate (1), which is open to the outside for guiding the knife blade and with an elastically resilient restoring force on each side of the slot (2), which is pivoted in the area of the Slit (2) crossing treatment rods (3, 3 '), at the crossing point (16) of which the knife edge can be placed,
characterized in that each treatment rod (3, 3 ') is rigidly connected on its pivot axis to a hub (17, 17') from the circumference of which an elastically resilient arm (18, 18 ') protrudes, the free end of which abuts a stop (Bolts (19, 19 ', 20, 21)) in the base plate (1). Apparatus according to claim 9, characterized in that the arm (18, 18 ') is made of plastic in one piece with the hub (17, 17'). Device according to one of the preceding claims, characterized in that the spring element (13, 13 '; 18, 18') is exchangeably fastened in the base plate (1). Device according to one of the preceding claims, characterized in that the spring element (13, 13 '; 18, 18') is already biased in the starting position. Device according to one of the preceding claims, characterized in that the base plate (1) consists of an injection molded part made of plastic or light metal. Device according to claim 13, characterized in that stops (29, 29 ') for the treatment rods (3, 3') are formed and / or molded on the base plate (1). Device according to claim 13 or 14, characterized in that fastening means (14, 14 ', 15, 15') for the spring element (13, 13 ') are injection molded onto the base plate (1). Device according to one of the preceding claims, characterized in that the base plate (1) has cutouts (22, 22 ', 28, 28') for handling the device. Device according to one of the preceding claims, characterized in that recesses (5, 5 ') serving as pivot bearings for the treatment rods (3, 3') are provided in the base plate (1). Device according to one of the preceding claims, characterized in that in the base plate (1) at least one recess (27, 27 ')) is provided, which is used to attach the device to a base. Apparatus according to claim 18, characterized in that a dovetail-shaped recess (27 ') is provided in the base plate (1) for sliding onto a holding part of a base. Device according to one of the preceding claims, characterized in that in each case one end of the treatment rods (3, 3 ') through a radial opening (bore (10))
is passed through a hub (4, 4 ') which is rotatably mounted in the base plate (1) of the device.

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