knife with two blades

Abstract

A knife (100) with two blades (110) is proposed, comprising a central part (120) and two guide plates (130, 135). The central part (120) is arranged between the guide plates (130, 135), thus forming two sheaths for receiving and guiding the two blades (110). Furthermore, the knife (100) has a sliding mechanism for each blade (110), whereby the blades (110) can be selectively moved into at least one extended position and into one recessed position within the knife (100). A track for the sliding mechanism for extending and retracting the respective blade (110) is formed in each of the guide plates (130, 135). This knife provides two blades in one tool. This saves space, as several separate tools are not required. The handle can be ergonomic and large enough to accommodate the blades even if they are optimally shaped for the respective purpose.At the same time, the blades are protected and safely stored in the recessed position.

Description

Field of the InventionThe invention relates to a knife.Such devices are used predominantly for cutting, lancing, chewing or chopping, very specialized designs being known for various applications.Prior ArtKnives are available in a wide variety of designs for a wide variety of fields of application.In order to reduce the space requirement and to increase the safety when the knife is not in use, there are knives whose blades are stored within the handle and are only retrieved for use. Known knives with this property are, for example, fall knives, spring knives, folding or pocket knives and also folding knives (for example Baisong or Butterfly knives). So-called cutter (e.g. carpet knives) also belong to this category.In order that the user does not have to carry a plurality of knives with them in order to provide all the functionalities necessary for a typical application, knives with a plurality of blades can also be provided. Typically, these are designed as pocket knives, the most known example being the Swiss pocket knife. Such knives typically include a plurality of blades or other tools (e.g., cork pullers, scissors, saw, can openers, file, etc.) which are rotatably mounted on axles at the outer ends of the handle so that they can be individually lowered into or raised from the handle. Typically, they are pressed into the retracted or deployed position by integrated springs. The blades or tools are parallel adjacent to each other and typically face in different directions for use, so that the handle is generally symmetrical, which is not particularly ergonomic. The rotatable mounting of the tools or blades also often restricts the strength or rigidity of the connection to the handle. Moreover, the shape of the blades or tools represents a compromise in order to achieve the desired compactness. Since a plurality of blades or tools are mounted on the same axle, it is also generally not possible to replace the blades or tools.From the publication DE 296 07 627 U1 a fastening and carrying device for blades is known which has a similarity to a cutter or carpet knife. This has a handle with at least one receiving compartment longitudinally extending therethrough for receiving a blade therein and a guide slot extending in a lateral side thereof and communicating with the receiving compartment. In the receiving compartment, there are provided a support plate having a groove formed on one side thereof for receiving an end portion of the blade, and a fixing member having an engaging end extending through the guide slot and fixing the blade to the support plate. There is also an open-ended receiving compartment for receiving blades.US 6,006,433 A describes a utility knife which also has similarity to a cutter. This has on opposite sides a channel with open ends which extends over the entire length of the housing. The central portions of the upper and lower edges of the channels include a plurality of teeth. In each channel there is arranged a sliding mechanism which receives a razor blade at each end, the sliding mechanism engaging by means of the teeth. Thus, instead of the usual one, a housing or handle contains a total of four razor blades which can be alternately extended or retracted by means of the two sliding mechanisms.The design publication U.S. Pat. No. 418,036 S also shows a tool for applying sealing material, which likewise has very great similarity to a cutter or carpet knife. It has two blades lying parallel to one another, it not being clearly recognizable whether the blades can be operated independently of one another. In addition, a rotatable disc is provided beneath the blades, which disc presumably performs a rolling function.From the publication DE 29 26 809 A1 an automatic spring blade is known. Its housing has two grooves, into each of which a spring steel strip is inserted on edge and running parallel to the longitudinal central plane of the blade. This can thus be bent towards or away from the central longitudinal axis of the blade. A spring steel strip can be brought with its free end into a lateral recess of the blade, which has an edge running perpendicular to the longitudinal axis of the blade as a stop for the spring steel strip. The recess also has an inclined edge which facilitates the engagement of the spring steel strip. This structure serves to make the handling of the spring blade more safe and reliable, since malfunctions of the latch mechanism are to be avoided.The object is to provide a method for performing a processThe object of the invention is to provide a knife which provides two blades which are retractable into the handle without having the mentioned disadvantages of a pocket knife.SolutionThis object is achieved by the subject matter of the independent claim. Advantageous developments of the subject matter of the independent claim are characterized in the dependent claims. The wording of all claims is hereby incorporated by reference into the content of this description.The use of the singular is not intended to exclude the plural, which is also to be considered in the reverse sense, unless otherwise disclosed.To achieve the object, a knife is proposed, having two blades, a middle part and two guide plates. The central part has depressions on both sides for the complete reception of the blades. The central part is arranged between the two guide plates, so that the central part and the two guide plates form two sheaths for receiving and guiding the two blades. In addition, the knife has a slide mechanism for each blade whereby each of the two blades is selectively movable into at least one extended and retracted position in the knife, wherein a path for the respective slide mechanism for extending and retracting the respective blade is formed in each of the guide plates.Such a knife makes it possible to provide in one tool two blades typically required for an activity, for example a filleting and shingling knife for fishing, or also a bread and meat knife etc. As a result, space can be saved, for example for the outdoor use, since no more separate tools are required. The handle can be designed ergonomically and so large that the blades fit in even if they have an optimum shape for the respective purpose. At the same time, when the blades are not used, they are protected and securely accommodated in the retracted position.The operation of the knife is improved if the paths of the guide plates perpendicular to their longitudinal direction have recesses for engaging the sliding mechanism. In particular, safety is increased in this way, since the blade cannot unexpectedly come out of the respectively provided position.The knife is even more versatile if for each blade there is at least one further recess for engaging the sliding mechanism, which recess corresponds to a partially extended position of the blade. In this way, shorter blades can also be provided for certain applications.The sliding mechanism preferably has a latching element, a sliding element, at least one spring and a pusher.An effective locking of the blades in the intended positions is achieved if the locking elements are block-shaped and extend perpendicular to the longitudinal direction of the respective blade and / or the path of the guide plate in such a way that they fit positively into the recesses for locking.Optimal functioning is made possible by the fact that the sliding elements are seated on the respective latching element, are rigidly but detachably connected to the respective blade and project through the path of the respective guide plate for operation.The slide elements can be connected to the respective blade in a particularly fixed and easily detachable manner by means of at least one screw connection and / or magnetic connection. In the case of a screw connection, conventional cross-slot screws are preferred.For operation, a pusher is preferably arranged on each slide element.This is connected through the sliding element to the respective latching element, for example by a screw or plug connection.The extension and retraction of the blades of the knife becomes particularly comfortable and safe if at least one spring is arranged in each slide element, which pushes out the pusher and thereby pushes the latching element connected to the pusher into the recesses for latching. Only when the trigger is pressed in can the blade then be extended or retracted. It is particularly preferred here if helical springs are arranged in the sliding element 2. However, other embodiments are also conceivable, for example with resilient sheet metal strips or rubber or plastic elements.The knife is particularly stable if the middle part is connected to the guide plates by a plurality of screw and / or bolt connections. It is preferred in this case if both screw and bolt connections are used. For the bolts, corresponding bores are provided in the central part and in at least one of the guide plates. Thus, the individual components can be connected to one another in a fixed but detachable manner, wherein it is ensured that they are correctly aligned with one another and do not slip.If bolt connections are provided, it is particularly preferred that the bolts are firmly connected to one of the guide plates or the middle part. This simplifies the assembly considerably, and the bolts cannot be lost.The ergonomicness of the knife can be further improved if it has grip shells which are arranged on the respective outer side of the guide plates. The handle trays each have a slot along the tracks of the guide plates for operating the slide mechanism. The sliding mechanism thus projects outwardly through this slot, whereby it can be easily operated. The further shape of the grip shells can be adapted to the shape of the hand of a user, for example.Preferably, the bolt connections also connect the handle shells to the guide plates and the central part. This ensures that the grip shells are correctly oriented and cannot slip during assembly.The handle shells are particularly easily mountable and replaceable if they have a plurality of permanent magnets which are magnetized orthogonally to the blade plane and project inwardly from the handle shells. For this purpose, positioning holes for the permanent magnets are then provided in the guide plates. Furthermore, the middle part consists of ferromagnetic material. The grip shells can then be released and mounted without tools, which makes it possible, for example, to adapt the grip shells to individual requirements of the user.The object is further achieved by a blade suitable for a knife as just described. The dimensions of the blade are designed such that it can be completely inserted into one of the sheathes of the knife.The blade preferably has holes and / or recesses which enable a positive, releasable connection to one of the latching elements. This applies in particular when the trigger is actuated. Then, the blade can be slid along the path of the guide plate.The blade fits particularly well to the knife if it has at least one provision for connection to a slide element. These can be, for example, one, preferably a plurality of bores with threads for screw connections, or also magnets.The object is also achieved by a set comprising a plurality of blades, each as described above. These may serve as a supplement to enable the knife to further functionality by replacing already present blades with others from the set.Preferably, the set includes blades having different sizes and / or different configurations of their respective blades. The functionality of the knife can thus be extended in a particularly wide variety of ways.Further details and features will become apparent from the following description of a preferred exemplary embodiment in conjunction with the figures.An exemplary embodiment is schematically illustrated in the figures. Identical reference numerals in the individual figures denote identical or functionally identical elements or elements corresponding to one another with regard to their functions. In detail, the following shows: FIG. 1 is a three-dimensional representation of a knife as described with a blade in the extended position; and FIG. 2 is an exploded view of such a knife.FIG. 1 shows a knife 100 as already described in a three-dimensional representation. The left blade 110 is shown in the fully extended position, while the right blade is not seen in this figure. The handle consists of the central part 120, the guide plates 130 and 135, and the handle shells 140 and 145. In the slot 150 in the (left) handle shell 140, which is arranged above the corresponding path of the (left) guide plate 130, the sliding element 160 can be seen with the pusher 170 of the sliding mechanism of the left blade 110. The connecting screw 180, by means of which the pusher 170 is connected to the latching element (concealed in this illustration), can also be seen.The exploded view of this knife in FIG. 2 allows the construction to be seen in detail. The left blade 210 and the right blade 215 fit into the recesses of the center part 220. These depressions, of which only the left-hand one 225 can be seen here, form a respective sheath for the respective blade together with the guide plates 230, 235. The handle trays 240, 245 are each disposed outside the corresponding guide plates. Screws 232 and bolts 237 can be seen on the left guide plate 230 and the holes or bores 233, 238 associated therewith can be seen on the right guide plate. By these means, guide plates and middle part 220 can be connected to one another. In this embodiment, the bolts 237 are fixedly connected to the left guide plate 230. However, it is also conceivable to connect them, for example, firmly to the central part 220 or even provide them as individual parts. In the embodiment shown in FIG. 2, the bolts also project outwards beyond the guide plates in order to ensure the correct alignment of the grip shells 240, 245. Corresponding holes or bores 248 can be seen on the right grip shell 245. Permanent magnets 242 can be provided for fastening the grip shells 240, 245 if the central part 220 is made of ferromagnetic material (e.g. iron or iron-containing alloy). These magnets 242 can be seen on the right hand grip shell 245. They can be arranged, for example, in a recessed manner in the handle shell or, as in the case shown, can protrude therefrom. The magnets 242 fit into positioning holes 243 provided for this purpose in the guide plates 230, 235 in this case. In this way they also contribute to the correct alignment of the handle shells.Tracks 252, 257 are present in the guide plates 230, 235, which guide the respective sliding mechanism for extending and retracting the blades 210, 215. These tracks have recesses 253, 258 for engaging the respective sliding mechanism. In this embodiment, three recesses are visible in each track, which correspond to a blade which is fully retracted, fully extended and only extended a small distance (for example 3 cm). For each of the blades 210, 215, the slide mechanism includes a latch member 260, 265, a slide member 270, 275, a pusher 280, and springs 290. Of the sliding mechanism of the right blade 215, only the latching element 265 and the sliding element 275 can be seen in this illustration. The latching elements 260, 265 are substantially block-shaped and extend perpendicularly to the direction of the tracks 252, 257. They fit into corresponding recesses 262, 267 of the respective blade, into which they can be pressed by the pusher 280. Otherwise, they can snap into the recesses 243 in the guide plates 230, 235. On the snap-in element 260, 265, the slide element 270, 275 is respectively mounted, on which the pusher 280 is seated. The trigger 280 is connected, for example by a screw connection, through the sliding element 270, 275 to the latching element 260, 265, whereby the latter can be actuated. The slider 270, 275 extends outwardly through the slots 250, 255 in the handle shells 240, 245 for operation. The springs 290 ensure that the pusher 280 and thus also the latching element 260, 265 are pushed outwards if the pusher 280 is not actuated. This complete sliding mechanism is connected to the respective blade 210, 215, for example by magnets. In the case depicted, on the other hand, a screw connection is present. Although the screws are not shown, the bores 295 provided for this purpose can be seen in the blades 210, 215.It can be seen that all connections of components are designed to be fixed and stable, but releasable, and in particular such that no complex tool is required for releasing and restoring the connections (at most one screwdriver). This facilitates both the replacement of parts for different purposes of use, for example the replacement of blades and / or handle shells, and the cleaning and care of the individual components, and their replacement in the event of a defect. This contributes to greater sustainability in handling resources and environmental protection through waste avoidance.Thus, such a knife having a set of blades configured for different purposes respectively can replace a larger set of different knives. This saves space and effort, which is advantageous in particular in the outdoor sector, for example in camping, roaming, fishing, survival, or for travelers.By replacing the grip shells, in particular the external appearance of the knife can be adapted to the user's wishes. However, the use of grip shells made of different materials with different grip, thermal conductivity, etc., is also possible, whereby adaptations to particular application purposes can be made possible. The knife can also be adapted to different hand shapes and sizes in this way.Reference numerals denote reference numerals100 Knife 110, 210 left blade 120, 220 middle part 130, 230 left guide plate 135, 235 right guide plate 140, 240 left grip shell 145, 245 right grip shell 150, 250, 255 slot 160, 270 left slide element 170, 280 pusher 180 connecting screw 215 right blade 225 left recess 232 screw 233 hole for screw 237 bolt 238, 248 hole for bolt 242 permanent magnet 243 positioning hole for magnet 252 left track 257 right track 253, 258 notches for engaging 260 left engage element 262, 267 notches in blade 265 right engage element 275 right slide element 290 spring 295 hole for screw connection in blade

Claims

A knife (100) comprising: 1.1 two blades (110; 210, 215); 1.2 a central portion (120; 220); 1.2.1 the central portion (120; 220) having depressions (225) on both sides for receiving the blades (110; 210, 215) completely; 1.3 two guide plates (130, 135; 230, 235); 1.3.1 the central portion (120; 220) being disposed between the two guide plates (130, 135; 230, 235); 1.3.2 the central portion (120; 220) and the two guide plates (130, 135; 230, 235) forming two slots for receiving and guiding the two blades (110; 210, 215); and 1.4 a sliding mechanism for each blade (110; 210, 215) whereby each of the two blades (110; 210, 215) is selectively movable into at least one extended position and into a retracted position in the knife (100); 1.4.1, wherein a path (252, 257) for the respective slide mechanism for extending and retracting the respective blade (110; 210, 215) is formed in each of the guide plates (130, 135; 230, 235).Knife (100) according to the preceding claim, characterized in that the tracks (252, 257) of the guide plates (130, 135; 230, 235) have, perpendicular to their longitudinal direction, recesses (253, 258) for engaging the sliding mechanism.Knife (100) according to the immediately preceding claim, characterized in that for each blade (110; 210, 215) there is at least one further recess (253, 258) for engaging the sliding mechanism, which recess corresponds to a partially extended position of the blade (110; 210, 215).Knife (100) according to one of the preceding claims, characterized in that the sliding mechanism has a latching element (260, 265), a sliding element (160; 270, 275), at least one spring (290) and a pusher (170; 280), respectively.Knife (100) according to the immediately preceding claim, characterized in that 5.1 the engagement elements (260, 265) are block-shaped; 5.2 wherein they extend perpendicular to the longitudinal direction of the respective blade (110; 210, 215) and / or the path (252, 257) of the guide plate (130, 135; 230, 235) in such a way that they fit positively into the recesses (253, 258) for engagement.Knife (100) according to one of the two immediately preceding claims, characterized in that the slide elements (160; 270, 275) 6.1 are seated on the respective latching element (260, 265); 6.2 are rigidly but releasably connected to the respective blade (110; 210, 215); and 6.3 project through the path (252, 257) of the respective guide plate (130, 135; 230, 235) for operation.Knife (100) according to the immediately preceding claim, characterized in that the slide elements (160; 270, 275) are connected to the respective blade (110; 210, 215) by means of at least one screw connection (295) and / or magnetic connection.Knife (100) according to one of claims 4 to 7, characterised in that 8.1 a pusher (170; 280) is arranged on each pushing element (160; 270, 275) for operation; 8.2 wherein the pusher (170; 280) is connected to the respective latching element (260, 265) through the pushing element (160; 270, 275).Knife (100) according to the immediately preceding claim, characterized in that 9.1 at least one spring (290) is arranged in each slide element (160; 270, 275); 9.2 wherein the spring (290) pushes out the pusher (170; 280) and thereby pushes the latching element (260, 265) connected to the pusher (170; 280) into the recesses (253, 258) for latching.Knife (100) according to one of the preceding claims, characterized in that the middle part (120; 220) is connected to the guide plates (130, 135; 230, 235) by a plurality of screw and / or bolt connections (232, 233, 237, 238).Knife (100) according to the immediately preceding claim, characterized in that 11.1 bolt connections (237, 238) are provided; 11.2 wherein the bolts (237) are firmly connected to one of the guide plates (130, 135; 230, 235) or the middle part (120; 220).Knife (100) according to one of the preceding claims, having 12.1 grip shells (140, 145; 240, 245); 12.1.1 wherein the grip shells (140, 145; 240, 245) are arranged on the respective outer side of the guide plates (130, 135; 230, 235); and 12.1.2 wherein the grip shells (140, 145; 240, 245) each have a slot (150; 250, 255) along the tracks (252, 257) of the guide plates (130, 135; 230, 235) for operating the sliding mechanism.Knife (100) according to the preceding claims 11 and 12, characterized in that the bolt connections (237, 238, 248) also connect the grip shells (140, 145; 240, 245) to the guide plates (130, 135; 230, 235) and the middle part (120; 220).Knife (100) according to claim 12, characterised in that 14.1 the grip shells (140, 145; 240, 245) have a plurality of permanent magnets (242); 14.1.1 the permanent magnets (242) being magnetised orthogonally to the blade plane; 14.1.2 the permanent magnets (242) protruding inwardly from the grip shells (140, 145; 240, 245); 14.1.3 positioning holes (243) for the permanent magnets (242) being provided in the guide plates (130, 135; 230, 235); and 14.2 the central part (120; 220) consists of ferromagnetic material.Blade (110; 210, 215) suitable for a knife (100) according to any of the preceding claims, characterized by dimensions such that it is completely retractable into one of the vaginas of the knife (100).Blade (110; 210, 215) according to the immediately preceding claim, characterised by holes and / or recesses (262, 267) which enable a positive, releasable connection to one of the latching elements (260, 265).Blade (110; 210, 215) according to one of the two immediately preceding claims, characterized byat least one provision (295) for connection to a slide element (160; 270, 275).A kit comprising a plurality of blades (110; 210, 215) each according to any one of the three immediately preceding claims.Set according to the immediately preceding claim, characterized in that the blades (110; 210, 215) have different sizes and / or different configurations of their respective cutting edge.

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