KNIFE WITH ONE KNIFE HANDLE AND ONE BLADE

Description

field of technology

[0001] The invention relates to a knife with a knife handle and a blade according to the features of the preamble of claim 1. State of the art

[0002] Knives of the type in question are known as "craft knives," "carpet knives," "Japanese knives," or even "Stanley knives." These knives are equipped with a handle into which a blade is retracted when the knife is not in use. To move the blade into a use position, it is extended relative to the handle, at least with respect to a portion of the blade, so that at least a portion of the blade's tip protrudes freely beyond one end of the handle.

[0003] Furthermore, two different blade designs are known. First, a design with a rigid blade that can be used in different positions or orientations and can be replaced after wear. And second, a design with a so-called break-off or segment blade, in which, after wear, a front blade segment in the extension direction is broken off along a predetermined breaking point.

[0004] For the state of the art, reference is made to DE 10 2005 038 308 A1 or DE 10 2011 007 234 B3.

[0005] A knife is known from WO 2008 / 066365 A1, but the manner in which an extended position is secured is not further explained. The blade carriage is provided with an actuating part formed immovably into a carriage part.

[0006] US 2005 / 019356 A1 discloses a knife with an actuating part and a blade carriage. The actuating part is firmly connected to a carriage part.

[0007] WO 99 / 07526 A1 discloses a knife with a blade carriage that can be locked in place. The locking mechanism is formed in a broad side of the housing. The blade carriage is designed without any parts that move relative to each other. A comparable knife is also known from US 2016 / 136825 A1. The locking mechanism is formed in the broad side of the housing. The blade carriage is designed without any parts that move relative to each other.

[0008] A locking mechanism in the broad side of the housing is also known in a knife known from US 4 240 202 A. In this context, reference should also be made to JP H 10 263217 A.

[0009] Further prior art is provided by US 6 484 404 B1, EP 2 703 133 A1 and US 2018 / 200898 A1. Summary of the invention

[0010] Based on WO 2008 / 066365 A1, the object of the invention is to provide a knife with a knife handle and a blade carriage with an actuating part and a carriage part, which is advantageously constructed.

[0011] This object is achieved in the subject matter of claim 1, wherein the blade carriage is essentially composed of the carriage part and a wedge carriage part, wherein the wedge carriage part is movable in a longitudinal direction relative to the carriage part when actuated via the actuating part, and wherein the locking of the blade carriage takes place as a result of an interaction of a carriage-side locking part with locking recesses provided on the inside of the wall of a narrow side of the receiving part or on the inside of the wall of a narrow side of the housing, wherein these locking recesses are arranged so as to be evenly distributed over the length.

[0012] When the blade is extended, the reinforcement section supports the blade, particularly in a bending direction perpendicular to the blade's broad surface, which would otherwise occur under corresponding load on the blade without the reinforcement section. Depending on the knife's application and, in addition, on the extended length of the blade relative to the knife handle, such potential bending stress on the blade can lead to an uncontrolled breakage of the blade, possibly to a breakage along a predetermined breaking point between two blade segments. The reinforcement section counteracts such bending stress and accordingly stabilizes, in particular, the extended section of the blade. Furthermore, the stability of the extended section of the blade achieved in this way enables precise cutting.

[0013] The reinforcement part, like the blade itself, is movable relative to the knife handle, preferably extending and retracting in the direction of movement of the blade. This sliding displacement of the reinforcement part can be coupled with that of the blade, so that a sliding displacement of the blade in the extension or retraction direction can result in a corresponding extension or retraction of the reinforcement part.

[0014] Alternatively, the reinforcement can be moved independently of the blade. This offers the user the option of optionally assigning the reinforcement to the extended area of ​​the blade, allowing the user to use the blade even under moderate bending stress if necessary. Furthermore, such a design allows the reinforcement to be moved into a blade support position over only a portion of the extended area of ​​the blade, or alternatively, over the entire extended area of ​​the blade.

[0015] A locking holder for the locked adjustment of different extended positions of the blade can initially be formed by a locking mechanism, seen from the blade carriage and / or the reinforcement part carriage below the area in which the blade or an imaginary extension of the blade extends.

[0016] To extend and retract the blade, a sliding carriage is provided, which is operatively connected to the blade, for example, through a form-lock connection. The sliding carriage has an outward-facing handle for the user, which allows sliding movement of the sliding carriage and, in turn, the blade.

[0017] The locking mechanism, particularly between the carriage and the knife handle, allows for different extended and retracted positions of the blade and / or a designated reinforcement. In connection with segmented break-off blades, it is known to offer locking positions of the carriage and thus of the blade depending on the distance between the predetermined breaking points between two blade segments.

[0018] The locking mechanism, in particular between the carriage and the knife handle, in particular the knife handle housing or a fixed part connected to the housing, can be located below the area in which the blade or an imaginary extension of the blade extends, as viewed from the carriage, or underneath the blade with respect to the handle of the carriage facing outwards towards the user, or underneath a blade plane resulting from the broad side lower surface of the blade facing away from the handle. With respect to the handle of the carriage facing the user, this can thus result in a locking mechanism that is covered by the blade, at least over the area of ​​the blade, and also by the carriage itself. This can result in a hidden locking mechanism.

[0019] The blade carriage may have a holding magnet for holding the blade in place.

[0020] The preferably provided holding magnet can serve according to the invention to support the retention of the blade on the associated carriage, particularly during a re-equipment of the carriage with a blade (blade change). The holding magnet can be provided in addition to a possible positive connection between the carriage and the blade. The magnetic force can also be selected such that, on the one hand, the blade is securely held on the blade carriage and therefore does not fall off even in an overhead position, for example, while, on the other hand, it allows the user to lift the blade from the blade carriage without the need for tools during a possible blade change.

[0021] A closure cap can be arranged on the knife handle at the rear of the blade, which closes the travel path for the blade travel carriage and / or the reinforcing part of the travel carriage.

[0022] According to one possible embodiment, the blade carriage and / or the reinforcement part carriage can be displaced in a sliding manner essentially over the entire longitudinal extent of the knife handle in the blade displacement direction and / or the reinforcement part displacement direction. In the extension direction, the sliding displacement of the carriage can be limited by a stop. This prevents unintentional displacement of the carriage and any blade attached thereto beyond the facing end of the knife handle.

[0023] In the opposite direction of displacement, corresponding to the retraction direction, the blade carriage, in particular, can be displaced beyond the corresponding end of the knife handle, for example, to enable a blade change, preferably by removing the locking mechanism between the carriage and the knife handle. The blade—and, correspondingly, the reinforcement part in the case of the reinforcement carriage—can then be completely removed from the area of ​​the knife handle.

[0024] During normal knife use, the sliding movement of the blade carriage and / or the reinforcement section carriage in the retraction direction is also limited by a stop. This stop can be provided by a locking cap that blocks the travel path essentially perpendicular to the travel direction. The carriage can then move against this cap with a stop limit. For purposes such as changing the blade, the locking cap can be removed to release the travel path.

[0025] A reinforcing part with the blade can be provided which can be moved relative to the knife handle, wherein the locking mechanism between the carriage and the knife handle can be formed below the blade or an imaginary extension of the blade and / or the blade carriage has a holding magnet for holding interaction with the blade, wherein furthermore a closure cap can optionally be arranged on the knife handle on the back side of the blade.

[0026] The reinforcement part can be movable relative to the blade. The direction of travel of the reinforcement part can, as is also preferred, be parallel to that of the blade. The reinforcement part and blade can thus be extended or retracted over different travel distances and (to a limited extent) independently of each other.

[0027] The knife handle can be elongated and have a longitudinal direction. During normal use of the knife, such an elongated knife handle is gripped by the fingers of one of the user's hands essentially transversely to the longitudinal direction, while the thumb, which may also be used to operate the carriage, points essentially in the longitudinal direction.

[0028] Furthermore, the knife handle can have a longitudinal extension dimension that can correspond to approximately 5 to 10 times or more of the width extension viewed transversely thereto.

[0029] According to a preferred embodiment, the blade can be movable in the longitudinal direction of the knife handle, preferably both in the extension and retraction directions.

[0030] The reinforcement part can also be movable in the longitudinal direction of the knife handle, corresponding to the same displacement direction as the blade.

[0031] According to one possible embodiment, the reinforcing part can be designed in a rod-like manner, associated with a longitudinal edge of the blade, wherein, according to a further embodiment, the reinforcing part can be designed to wrap around the edge of the blade. The stiffening of the blade using the reinforcing part takes place accordingly in the area of ​​the edge of the blade, in particular the edge opposite the cutting edge of the blade, essentially in the area of ​​the blade spine.

[0032] For this purpose, the reinforcing part can have, for example, a U-shaped cross-sectional area in a cross-section perpendicular to the longitudinal extent, wherein the reinforcing part with its U-legs running essentially parallel in cross-section can cover the blade area along the edge on the top and bottom sides and the edge of the blade runs associated with the U-web of the reinforcing part connecting the U-legs.

[0033] The reinforcing part can have such a U-shaped cross-sectional design, in particular over its entire usable length that can be brought into interaction with the blade, whereby the reinforcing part is designed to be rigid, in particular in a direction transverse to the extension or retraction direction.

[0034] The U-legs of the reinforcement profile can have a free extension length in cross-section, viewed from the U-web connecting these legs, which can correspond to one fifth to one tenth or less of the width of the blade viewed in the same direction and thus transverse to the direction of travel of the blade.

[0035] The knife handle features a receptacle for the blade carriage connected to the blade. The receptacle provides guidance for the carriage, particularly during the blade extension and retraction process. The receptacle can be slotted along the length of the knife handle.

[0036] The knife handle also has a travel mount for the reinforcement slide connected to the reinforcement. This travel mount also runs in a slot-like manner in the longitudinal direction of the knife handle, as described above.

[0037] The blade carriage and the reinforcement part carriage are arranged in the same receptacle. Thus, the single receptacle for the knife handle serves to guide and, if necessary, hold both the blade carriage and the reinforcement part carriage. Thus, if both carriages are arranged together in the receptacle, the blade carriage and the reinforcement part carriage can be arranged one behind the other in the receptacle, in terms of the longitudinal direction or the direction of travel. Furthermore, as is also preferred, the blade carriage can be arranged in front of the reinforcement part carriage, viewed in the extension direction.

[0038] In a further embodiment, the blade can be designed as a flat part, having a thickness that is essentially the same in both the longitudinal and transverse directions. For example, the blade can be made from a continuous steel strip.

[0039] The blade can also have predetermined breaking points for breaking off a used blade segment. Thus, for a possible blade with an exemplary length of approximately 80 mm and a transverse width of approximately 9 to 25 mm, and a substantially constant thickness of approximately 0.4 to 0.7 mm, 10 to 15 such predetermined breaking points can be provided, more preferably approximately 12 predetermined breaking points, resulting in a corresponding number of usable blade sections.

[0040] To lock the carriage, a retained locking part is provided in the blade carriage and / or in the reinforcement part carriage, and locking openings or recesses arranged one behind the other in the longitudinal direction are provided in the knife handle. The locking position is achieved by the engagement of the locking part in one of the locking openings. In particular, the blade carriage can lock with the knife handle, for example, in blade segment length increments. This is achieved by appropriately spacing the locking openings or recesses in the longitudinal direction. In one possible embodiment, the locking distance of the reinforcement part carriage in the displacement direction corresponds to that of the blade carriage.

[0041] The arrangement can further be selected such that the locking part of the reinforcement part carriage can enter the same locking openings or locking recesses as the locking part of the blade carriage.

[0042] Individual locking openings, such as hole-like ones, can be provided in the knife handle. A slot-like locking configuration along the entire length is also possible, with tapered areas that define successive locking openings in the lengthwise direction.

[0043] According to a further, also preferred, embodiment, the locking part accommodated in the blade carriage can penetrate the blade in the region of a blade opening. Accordingly, in such a configuration, the locking part can serve not only to lock the carriage in place but also to positively secure the blade to the carriage.

[0044] Thus, the locking part accommodated in the blade carriage can engage the blade both in the locked state and during the blade's movement from a first to a second locking position. The engagement position or positive locking position between the blade carriage and the blade is preferably maintained over the entire possible travel path of the blade when the associated carriage is guided in the travel holder by the locking part penetrating the blade.

[0045] In a further embodiment, the locking mechanism for the blade carriage and the blade on the carriage can be designed separately. For example, a locking projection formed separately from the locking part can be provided on the blade carriage, which extends through the blade opening to hold the blade.

[0046] In addition, the locking projection can be biased into the locking position by a spring. For this purpose, a separate spring acting on the locking projection can be provided if the locking mechanism for the blade on the carriage is designed separately. The spring can be a leaf spring, for example, or even a cylindrical compression spring or the like.

[0047] The separate locking mechanism for the blade on the blade carriage also offers the possibility of releasing the locking mechanism of the blade without affecting the locking mechanism of the blade carriage. For this purpose, it can be further provided that the locking mechanism of the blade on the locking projection of the blade carriage can be released via an actuatable button provided on the housing. This button can preferably be actuated by the user from the outside of the housing.

[0048] According to one possible embodiment, the blade's locking mechanism on the blade carriage can be released in any travel position of the blade carriage. A preferred embodiment is one in which this locking mechanism of the blade can only be released in a predetermined travel position of the blade carriage. More preferably, this position corresponds to a maximum possible extension position of the blade together with the blade carriage. Only in this position is a locking release possible upon pressing the button.

[0049] The blade carriage and / or the reinforcement part carriage comprise an actuating part and a carriage part, the actuating part being movable longitudinally relative to the carriage part. The actuating part is freely movable outwardly for actuation by the user, for example, for thumb actuation. This actuating part can be slidably displaced in the longitudinal direction of the knife housing, initially relative to the carriage part guided in the travel holder, which is initially locked by the aforementioned locking mechanism.

[0050] When applied in the longitudinal direction, the actuating part - with the slide part blocked accordingly - causes the locking part to be pulled out of the locking opening and thus the locking of the slide part is released, corresponding to the entire corresponding travel slide.

[0051] After the locking mechanism is released, the actuating part can be moved longitudinally together with the carriage part, thus extending or retracting the blade and / or the reinforcement part. Advantageously, to release the locking mechanism and move, for example, the blade into an extended position, the actuating part, which is usually operated by a thumb, is only displaced longitudinally by sliding. This sliding displacement of the actuating part causes both the locking mechanism to be released and the displacement of the moving part (blade or reinforcement part) connected to the carriage. This simplifies operation compared to known solutions in which the actuating part must be pressed down essentially perpendicular to the direction of travel and then pushed.

[0052] According to one possible embodiment, the locking part can be spring-loaded into the locking position. This user-friendly design results in the locking part automatically returning to the locking position. This position can be automatically assumed as soon as the locking part overlaps a locking opening. The locking part can be raised via the actuating part, counter to the force of the spring.

[0053] In one possible embodiment, the spring may be a leaf spring, alternatively, for example, a conventional cylindrical spring in the form of a compression or tension spring; furthermore, if appropriate, a spring element made of an elastically resilient plastic material.

[0054] The actuating part can also interact with the slide part via a spring acting longitudinally. This spring applies pressure to the actuating part and slide part toward a home position, which can correspond to the detent position. The sliding displacement of the actuating part relative to the slide part therefore preferably occurs counter to the force of the spring.

[0055] This spring can also be, for example, a cylindrical spring, further, for example, in the form of a compression or tension spring, further, for example, a leg spring or an elastically resilient plastic element.

[0056] The spring can be supported at both ends in the slide part, but can be lifted off a respective support surface by the actuating part when the actuating part is subjected to longitudinal pressure. Accordingly, in a home position of the carriage, where the actuating part is not subjected to pressure, the spring can be supported at both ends, if necessary solely, on corresponding surfaces of the slide part. Only upon sliding displacement of the actuating part relative to the slide part is an end region of the spring lifted off the facing surface section of the slide part, resting against a corresponding surface section of the actuating part.

[0057] A wedge-shaped slide part is provided, which is movable in the longitudinal direction relative to the slide part by means of the actuating part in order to act on the locking part. The wedge-shaped slide part can interact directly with the locking part. Accordingly, an indirect interaction between the actuating part and the locking part results. According to one possible embodiment, the wedge-shaped slide part is displaced relative to the slide part via the actuating part, and thus more preferably dragged along in the sliding direction by the actuating part. During this displacement, the locking part can be pulled out of the locking opening via a wedge surface provided in the wedge-shaped slide part.

[0058] For this purpose, the locking part can have a free-standing loading surface transverse to the longitudinal direction, for cooperation with the wedge slide part, in particular for cooperation with a corresponding wedge surface of the wedge slide part.

[0059] In one possible embodiment, the closure cap can be plugged and / or latched onto the knife handle, in particular onto the handle housing. Furthermore, the closure cap can be slidably mounted on the knife handle transversely to its longitudinal extension. A groove-like positive-lock guide for the closure cap can be provided at the end of the knife handle. In the insertion direction or the direction of attachment of the closure cap, the sliding displacement path can be limited by a stop, whereby the possibly limited end position can be secured, for example, by a latch.

[0060] Alternatively, the cap can also be attached to the handle housing in a pivoting or foldable manner.

[0061] In one possible embodiment, in the arrangement position, the outer contour of the knife handle, in particular of the handle housing, further in particular in the end area having the closure cap, merges at least approximately seamlessly into the contour of the closure cap.

[0062] According to a preferred embodiment, the closure cap can only be removed in one direction transverse to the longitudinal extent of the knife handle in order to expose the travel receptacle guiding the travel carriage(s) for the rearward removal of the travel carriage with the travel part (blade and / or reinforcement part) arranged thereon.

[0063] The closure cap can have an outwardly exposed groove to provide a break-off aid when the closure cap is removed. The groove is designed to accommodate a front edge region of the foremost blade segment in the extension direction, after which this edge region of the blade segment is surrounded by the cap-side groove wall in a substantially U-shaped cross-section. Using the closure cap, this foremost blade segment can be easily broken off along the predetermined breaking point.

[0064] A particularly advantageous development is one in which a magnet can be arranged in the closure cap, corresponding to the groove, for holding a broken-off blade segment in the groove. The broken-off blade segment is securely held in place thanks to the magnet's position in the groove of the closure cap. Accordingly, there is no uncontrolled release of the blade segment during the breaking process. This ensures safe and improved handling.

[0065] The magnetic force is preferably selected so that the broken-off blade segment is securely held in the groove, taking into account the forces acting on the blade segment during the breaking-off process. The magnetic force is set so low that the blade segment can be removed from the groove without difficulty, if necessary with the aid of pliers to grasp the blade segment.

[0066] According to one possible design, the locking part can be movable for locking or unlocking essentially perpendicular to the width of the blade. Alternatively, a corresponding movement of the locking part transverse to a displacement direction of the blade carriage and / or the reinforcement part carriage is possible. This allows a reduced height of the knife overall to be achieved.

[0067] The blade carriage and / or the reinforcement part carriage can have a width, wherein a width direction of the reinforcement part carriage and / or the blade carriage can correspond to a width of the blade, wherein the locking part is further movable in the width direction of the blade carriage and / or the reinforcement part carriage. The width or the width direction is preferably viewed transversely to a longitudinal extension of the knife blade or transversely to a displacement direction of the blade, and optionally also transversely to a longitudinal extension of the knife as a whole.

[0068] The locking part can be a sphere or a cylinder. With a cylindrical design, the locking part can, for example, have a circular disc shape, an oval cross-sectional area, or even a polygonal surface transverse to a longitudinal extension.

[0069] Thus, according to a further preferred embodiment, the locking part can be designed in the form of a locking pin.

[0070] The blade carriage and / or the reinforcement part carriage can have a locking projection on one longitudinal side for interaction with the locking part in a locking position. In a locking position, this locking projection acts on the locking part in such a way that it is forced into an associated locking opening or locking recess, preferably fixed relative to the carriage.

[0071] The blade carriage and / or the reinforcement part carriage can also have a displacement projection for interacting with the locking part in a release position. The displacement projection can be suitable for displacing the locking part out of the locking position when the locking is released and / or for supporting the locking part in the release position when the respective carriage is displaced.

[0072] In a preferred embodiment, the displacement projection can protrude further in the width direction than the locking projection. The displacement projection can protrude beyond the locking projection by a distance, viewed in the width direction, which can correspond to approximately one-tenth to one-third of the greatest extent of the locking part viewed in the width direction, furthermore, for example, approximately one-fifth.

[0073] In one possible embodiment, the locking projection and / or the displacement projection can be provided on a wedge-slide part that is held displaceably relative to the displacement slide. Short description of the drawings

[0074] The invention is explained below with reference to the accompanying drawings, which, however, only represent exemplary embodiments. A part that is explained only with reference to one of the exemplary embodiments and is not replaced by another part in another embodiment due to the special feature highlighted therein is thus also described for this further embodiment as a possible part present at any rate. The drawing shows: Fig. 1 shows the knife in perspective view relating to a first embodiment; Fig. 2 shows the top view of the knife; Fig. 3 shows a side view of the knife; Fig. 4 shows the rear view of the knife; Fig. 5 shows the front view of the knife; Fig. 6 shows the longitudinal section along the line VI-VI in Figure 2 ; Fig. 7 the enlargement of area VII in Figure 6 ; Fig. 8the section along the line VIII-VIII in Figure 7 ; Fig. 9the section along the line IX-IX in Figure 7 ; Fig. 10 a detailed view of a carriage area of ​​the knife in partial explosion; Fig. 11 the carriage area in plan view, with the actuating parts of the carriage removed; Fig. 12 the knife in exploded perspective view; Fig. 13 an enlarged exploded perspective view of a carriage; Fig. 14 an exploded perspective view of the knife in bottom view; Fig. 15 the longitudinal section along the line XV-XV in Figure 6; Fig. 16 the longitudinal section along the line XVI-XVI in Figure 2 ; Fig. 17 the enlarged view of area XVII in Figure 16 ; Fig. 18 the enlarged view of area XVIII in Figure 16 ; Fig. 19 a representation according to Figure 17 , but with the actuating part of a blade carriage shifted in an extension direction, to cancel a locking position; Fig. 20 a representation according to Figure 18 , however, concerning the position pursuant to Figure 19 ; Fig. 21 a subsequent representation to Figure 19 , with further sliding displacement of the actuating part and dragging of the entire blade carriage with the blade held thereon; Fig. 22 a representation according to Figure 18 , however, concerning the subsequent presentation according to Figure 21 ; Fig. 23 a subsequent representation to Figure 21 , when the sliding action of the actuating part is removed and the locking position is assumed; Fig. 24 a sectional position according to Figure 19, but after removing the locking position for moving the blade carriage in the retraction direction; Fig. 25 one of the Figure 19 corresponding illustration concerning the locking release and sliding displacement of a reinforcement part carriage in the extension direction; Fig. 26 a perspective illustration of a front knife end, with the blade partially extended; Fig. 27 a subsequent illustration to Figure 25 , after a sliding displacement of the reinforcement part moving part in the extension direction; Fig. 28 one of the Figure 26 corresponding illustration, with the reinforcement part extended; Fig. 29 the section along the line XXIX-XXIX in Figure 28 , with corresponding detail enlargement; Fig. 30one of the Figure 1 corresponding representation, concerning a second embodiment; Fig. 31 a perspective bottom view towards the knife according to arrow XXXI in Figure 30; Fig. 32 the top view of the knife of the second embodiment; Fig. 33 a side view of the knife; Fig. 34 an exploded perspective view of the knife; Fig. 35 an exploded perspective view of a blade carriage and a reinforcement part carriage; Fig. 36 an exploded perspective view of the knife in bottom view; Fig. 37 the enlarged section according to the line XXXVII-XXXVII in Figure 33 , concerning a locking position; Fig. 38one of the Figure 37 corresponding illustration, but concerning a position after the locking mechanism has been released; Fig. 39 the section along the line XXXIX-XXXIX in Figure 32 ; Fig. 40the knife in perspective view looking at the back, with the blade fully extended; Fig. 41the section along the line XLI-XLI in Figure 40 ; Fig. 42one of the Figure 41 corresponding sectional view, but concerning a locking position for possible removal of the blade. Description of the embodiments

[0075] Shown and described is, firstly with reference to the representation in Figure 1 , a knife 1 in the form of a so-called cutter knife, whereby the representations of the Figures 1 to 29 show a first embodiment.

[0076] The knife 1 initially and essentially comprises a knife handle 2 and a blade 3, which may be designed as a so-called segment blade.

[0077] The blade 3 is slidably displaceable relative to the knife handle 2 in the longitudinal direction L of the knife handle 2. This results in an extension direction A and a retraction direction E of the blade 3.

[0078] The knife handle 2 initially has a housing 4, for example made of a hard plastic, furthermore, for example, in the form of a plastic injection-molded part. Alternatively, the housing 4 can also be a metal housing, for example, made of a zinc die-casting.

[0079] The housing 4 has, with respect to the longitudinal direction L, two in a cross-section, for example as shown in Figure 8 opposite narrow housing sides 5 and a housing base 6 connecting these narrow housing sides 5 to one another. Opposite the housing base 6, a housing cover 7 is formed, which centrally leaves a slotted opening 8 extending in the longitudinal direction L over the entire length of the housing cover 7. Furthermore, the housing 4 has a front opening 9 and a rear opening 10. The slotted opening 8 opens into these openings 9 and 10 at the end.

[0080] The rear opening 10 is closed by a closure cap 11 in the normal use state of the knife 1. This closure cap 11 is positively connected to the housing 4 in the use position. For this purpose, a positive-locking guide is provided in the illustrated embodiment, wherein the closure cap 11, with reference to a cross-section through the closure cap 11 perpendicular to a possible displacement direction of the closure cap 11, has guide webs 12 facing the housing cover 7 and the housing base 6, which engage in corresponding guide grooves 13 of the housing 4 in the region of the housing cover 7 and the housing base 6.

[0081] This provides a guided sliding displacement of the closure cap 11 transversely to the longitudinal direction L.

[0082] In the sliding direction, the sliding displacement of the closure cap 11 is limited by a stop. For this purpose, a stop 14 is formed on the housing 4 in the corresponding section of the housing's narrow side 5. The closure cap 11 can be freely displaced in the opposite direction to the sliding direction, enabling complete removal of the closure cap 11 from the housing 4.

[0083] The closure cap 11 has an outwardly exposed groove 15. This groove is provided on the cap side, when the closure cap 11 is arranged on the knife handle 2, facing away from the slotted opening 8, and extends essentially parallel to the guide webs 12 of the closure cap 11 and thus preferably transverse to the longitudinal direction L.

[0084] The groove 15 forms a substantially U-shaped receptacle in cross-section. This can be used, with the closure cap 11 removed, to break off a tip-side blade segment 16 of the blade 3 along a predetermined breaking line 17.

[0085] A magnet 18 is provided associated with the groove 15 and acting on a blade segment 16 that may be located in the groove 15. This magnet can be embedded in the preferred plastic material of the closure cap 11, in particular associated with a groove surface that, in cross-section, delimits a U-shaped leg of the groove 15. This magnet can be a permanent magnet.

[0086] A blade segment 16 broken off from the blade 3 with the aid of the closure cap 11 is thus securely held magnetically in the groove 15.

[0087] Part of the knife handle 2 is also a movable receptacle 19, preferably made of a metal material. As also shown, this can be a bent sheet metal part. This, too, is elongated in the longitudinal direction L, similar to the housing 4, and has two receptacle narrow sides 20 opposite in cross-section and a receptacle base 21 connecting the receptacle narrow sides 20.

[0088] Opposite the receiving base 21, a receiving ceiling 22 is formed. This also has a slotted opening 23 extending centrally in the longitudinal direction L, which extends from a rear opening 24 in the longitudinal direction L toward a front opening 25 of the movable support 19, but while leaving a substantially complete section 26 of the receiving ceiling 22 provided at the front.

[0089] The movable mount 19 is mounted in the housing 4 below the slotted opening 8 in a mount 27 whose cross-section is adapted to the movable mount 19. In this mounting position, the slotted opening 23 of the movable mount 19 is directed upwards toward the slotted opening 8 of the housing 4. The rear end with the opening 24 can extend essentially in the plane defined by the rear opening 10 of the housing 4, oriented perpendicular to the extension or retraction direction A, E.

[0090] At the front end, the travel holder 19 extends freely beyond the front opening 9 of the housing 4, approximately over a length that is defined by the substantially closed section 26 of the receiving cover 22.

[0091] In the essentially U-shaped receiving contour of the displacement receptacle 19, which results in a cross-section transverse to the longitudinal direction L, the blade 3 is initially received in a slidingly displaceable manner in the extension direction A or retraction direction E. In a use position of the knife 1, at least the tip-side blade segment 16 is displaced into a freely projecting position via the tip-side edge of the displacement receptacle 19 pointing in the extension direction A.

[0092] The blade 3 is overall leaf-shaped with longitudinal edges and narrow edges, whereby one longitudinal edge of the blade 3 forms the cutting edge 28.

[0093] The blade 3 points with its broad side surfaces towards the housing cover 7 and the housing base 6.

[0094] Furthermore, the blade 3 is divided into several trapezoidal blade segments 16 arranged one behind the other in the longitudinal direction L, which blade segments 16 are initially connected to one another via predetermined breaking lines 17. For example, ten, eleven, or even fifteen such blade segments 16 can be pre-stamped. Only the blade segment 16 exposed at the front end can be used for cutting, but all exposed blade segments 16 can also be used, i.e., even several segments protruding beyond the front end.

[0095] A bore-like blade opening 29 is formed in the rear end of the blade 3 for positively holding the blade 3 on a blade carriage 30.

[0096] The blade carriage 30 as well as a reinforcement part carriage 31 described below essentially consist of a carriage part 32, an actuating part 33 and a wedge carriage part 34, furthermore a locking part 35.

[0097] The slide part 32 is mounted on the travel holder 19 so as to be displaceable in the longitudinal direction L. For this purpose, external receiving grooves 36 of the slide part 32 extending in the longitudinal direction L engage the mutually facing edges of the slotted openings 23 on the travel holder side. With reference to a cross-section, a part of the slide part 32 can extend within the U-shaped opening of the travel holder 19 and a - larger - part of the slide part 32 can extend substantially in the region of the slotted opening 8 of the housing 4.

[0098] Pointing toward the housing cover 7, the slide part 32 is box-shaped. The wedge slide part 34 rests on the box bottom of the slide part 32, capable of sliding movement in the longitudinal direction L, flanked on both sides in the longitudinal direction L and optionally guided—at least partially—by box walls 38 of the slide part 32.

[0099] Furthermore, a substantially elongated rectangular opening 39 is formed in the box base 37. The longitudinal side, with respect to the plan view of the opening, is directed transversely to the longitudinal direction L.

[0100] Through this opening 39, the locking part 35, which in the first embodiment is designed as a locking pin 66, engages, the pin body of which is essentially cross-sectionally adapted to the opening surface of the opening 39.

[0101] According to this design, the locking part 35 is held in the slide part 32 in a rotationally fixed manner about an axis directed perpendicular to the longitudinal direction L and perpendicular to the housing base 6, but is linearly displaceable along this axis.

[0102] In the first embodiment, the locking part 35 also penetrates the wedge slide part 34 in the region of a bottom opening 40, in particular in the region of a waist section 41. On both sides of the end of the waist section 41, extended pin sections remain, essentially adapted to the opening area of ​​the opening 39 in the box bottom 37.

[0103] The pin section 42, which engages in an interior region of the wedge-slide part 34, forms free-standing application surfaces 43 on the underside, ie directed in the direction of the housing base 6, for interaction with wedge surfaces 44 of the wedge-slide part 34.

[0104] The wedge surfaces 44 are provided on both sides of the opening 40 passing through the wedge slide part 34, viewed in the longitudinal direction L. Furthermore, two wedge surfaces 44 are provided on each side, which run in opposite directions in the longitudinal direction L and meet in a valley in the middle of the extension of the wedge slide part 34, viewed in the longitudinal direction L. In this valley, the locking part 35 rests with its contact surfaces 43 in a locked basic position against the wedge surfaces 44 (see Figure 17 ).

[0105] The wedge surfaces 44 extend accordingly from this in the extension direction A and in the retraction direction E at an angle of approximately 10 to 20 degrees.

[0106] The locking part 35 can be loaded in the direction of the receiving base 21 via a spring 45 in the form of a leaf spring.

[0107] According to the illustrations, the spring 45 can be fastened to the slide part 32 in the manner of an abutment using a fastening element 46, for example in the form of a screw (see Figure 17 ).

[0108] The locking part 35 engages through the opening 39 of the slide part 32 into a locking opening 47 in the receiving base 21. In this locking position, the travel slide 30, 31 is fixed in the longitudinal direction L.

[0109] The receiving base 21 has, viewed in the longitudinal direction L, a plurality of locking openings 47 arranged one behind the other and having the same opening area. Their opening cross-section essentially corresponds to that of the opening 39 in the slide part 32 and is adapted accordingly to the cross-sectional design of the locking part 35, in particular the locking pin 66.

[0110] As also shown, the locking openings 47 can be connected to one another by waist-like, slot-shaped openings which are correspondingly reduced in terms of the opening area compared to the locking openings 47.

[0111] To enable sliding displacement of the slide part 32, the locking connection between the locking part 35 and the locking opening 47 must be removed. For this purpose, the wedge slide part 34 is preferably acted upon in such a way that it is displaced relative to the slide part 32 in the longitudinal direction L. This is achieved using the actuating part 33, which is exposed in the slotted opening 8 on the housing side with an actuating surface 48.

[0112] The actuating part 33 has, on its underside and pointing toward the slide part 32, driving projections 49 which, viewed in the longitudinal direction L, each engage against corresponding surfaces of the wedge slide part 34 on the outside of the wall. The wedge slide part 34 is accordingly captured in the longitudinal direction L between these driving projections 49.

[0113] A sliding displacement of the actuating part 33 in the extension direction A causes a corresponding dragging of the wedge slide part 34 via the rear driving projection 49 viewed in the extension direction A. The locking part 35 is pulled out of the locking opening 47 via the rear wedge surfaces 44 in the extension direction A in a direction perpendicular to the longitudinal direction L (see Figure 19). This relative sliding displacement of the actuating part 33 and the wedge-shaped slide part 34 takes place until the section of the slide part 34 cooperating with the driving projection 49 comes into contact with the raised locking part 35 to a limiting extent, after which the slide part 32 is now also dragged along via the locking part 35 with a corresponding further sliding displacement of the actuating part 33 in the extension direction A.

[0114] In the same way, a sliding displacement takes place in the opposite direction, namely in the retraction direction E, whereby the rear driving projection 49 of the actuating part 43 in the retraction direction E interacts with the wedge slide part 34 and the rear wedge surfaces 44 in the retraction direction E lift the locking part 35 or pull it out of the locking opening 47 (see Figure 24 ).

[0115] Accordingly, in order to release the locking mechanism and to shift the slide in the longitudinal direction L, only a deliberate shifting of the respective carriage 30, 31 is necessary.

[0116] Upon completion of the sliding displacement of the travel carriage 30, 31 with corresponding removal of the load on the actuating part 33 in the sliding direction, the respective wedge carriage part 34 with the actuating part 33 returns to an initial position, which preferably corresponds to the locking position.

[0117] For this purpose, the wedge slide part 34 is loaded toward the home position by a spring 50, here in the form of a cylindrical compression spring. This spring 50 is located in a spring receptacle 51 formed in the slide part 32 on the box base 37. In a (neutral) home position, it is supported, if necessary, at both ends on associated wall sections of the spring receptacle 51.

[0118] The carriage-side contact surfaces for the spring 50 are each penetrated by projections 52 of the actuating part 33, whereby at least one projection 52 can also be formed directly by a driving projection 49. The projections 52 have support surfaces 53 directed towards one another, which, depending on the direction of travel A or E, become effective for lifting the facing end of the compression spring received in the spring receptacle 51 from the facing contact surface in the receiving surface 51. If the spring 50 is designed as a cylindrical compression spring, it is tensioned accordingly when the actuating part 33 is displaced in a direction of displacement between a support surface 53 of the actuating part 33 and a contact surface of the spring receptacle 51.

[0119] As a result of this design, only one spring 50 causes a return to the initial position both in the case of a sliding displacement in the extension direction A and in the retraction direction E.

[0120] The above-described functionality for unlocking, sliding displacement and locking applies to both the blade carriage 30 and the reinforcement part carriage 31.

[0121] The locking part 35 of the blade carriage 30 can simultaneously engage through the blade opening 29, thereby positively connecting the latter to the blade carriage 30. The blade 3 is received on the underside of the carriage part 32 in a receiving pocket 54 opening toward the receiving base 21 of the moving receptacle 19. Even in the raised position of the locking part 35, which releases the locking, the locking part 35 continues to engage through the blade opening 29, thus maintaining the positive locking position even during a sliding displacement.

[0122] The associated end of the blade 3 is positioned in the receiving pocket 54 such that its broad side rests on a preferably flat support surface 65. This support surface 65 is penetrated by the locking part 35.

[0123] The receiving pocket 54 and thus also the support surface 65 are delimited by a contact surface 64, against which a transverse edge of the blade 3, preferably running parallel to the predetermined breaking lines 17, can rest. The shape of the contact surface 65 is adapted to that of the transverse edge. In a preferred embodiment, the transverse edge runs at a distance from the contact surface 65.

[0124] As the blade 3 extends, the free end of the blade 3 pointing toward the tip of the travel holder is displaced through the front opening 25 of the travel holder 19. The blade 3 is guided in the direction of the blade plane by curved spring sections 55 in the region of the ceiling-side section 26 and in the region of the receiving base 21 of the travel holder 19.

[0125] To further secure the positive locking between the carriage-side locking part 35 and the blade 3, a holding magnet 56 can be arranged in the carriage part 32 of the blade carriage 30, for holding cooperation with the blade 3 in the receiving pocket 54 receiving the blade opening 29. This proves particularly advantageous when changing the blade, in which, after removing the closure cap 11, the blade carriage 30 together with the blade 3 is pulled out through the rear opening 10 of the housing 4 and the rear opening 24 of the displacement receptacle 19. In particular, the reinsertion of a new blade 3, if necessary, together with the blade carriage 30 proves to be significantly simplified by the inventive arrangement of a magnet that holds the blade 3 on the carriage part 32.

[0126] As further evident from the illustrations, a reinforcement part carriage 31 can be provided. This carriage is also displaceable in the same receptacle 19 in the longitudinal direction L, both in the extension direction A and in the retraction direction E. The reinforcement part carriage 31 is arranged behind the blade carriage 30, viewed in the extension direction A.

[0127] The reinforcement part displacement carriage 31 serves for the deliberate linear displacement of a reinforcement part 57, on which reinforcement part 57 the blade 3, in particular the area of ​​the blade 3 extended beyond the front opening 25 of the displacement holder 19, is supported in the extended position.

[0128] For this purpose, the reinforcing part 57 has a substantially U-shape in a cross-section transverse to the longitudinal direction L, with two spaced-apart, parallel U-legs 58 and a U-web 59 connecting the U-legs. The edge 60 of the blade 3, which is opposite the cutting edge 28 on the broad side, is received in the U-opening, this with reference to a cross-section, for example according to Figure 9 over a length or depth of the U-groove viewed transversely to the longitudinal direction L, which can correspond to approximately one sixth to one quarter of the width of the blade 3 viewed transversely to the longitudinal direction L.

[0129] At the end, facing the rear area of ​​the housing 4, the reinforcement part 57 forms a sword-like extension 61. This extension is received in a slot-like receptacle of the slide part 33 of the reinforcement part carriage 31. The reinforcement part 57 is thus positively connected to the corresponding slide part 32 and can be displaced by sliding in the longitudinal direction L via this slide part.

[0130] Furthermore, the reinforcement part 57 is guided in an edge region laterally of the carriage parts 32 in the travel holder 19, and in a fully retracted position of the reinforcement part and blade travel carriage 30, 31, extends at least approximately over the entire length of the blade 3.

[0131] When the blade 3 is extended, if necessary, particularly if a large bending stress on the blade 3 is expected during the cutting work and thus the risk of blade segments 16 breaking off, the reinforcement part carriage 31 can also be displaced in the extension direction A after the locking is released, wherein the front end region of the reinforcement part 57 facing away from the carriage also protrudes via the front opening 25 of the travel holder 19 and here - also visible - grips the edge 60 of the blade 3 and stabilizes the blade 3.

[0132] If, however, a slight flexibility of the extended section of the blade 3 is actually useful for the cutting process to be carried out, the reinforcing part carriage 31 can be moved back into the retraction direction E or can remain in the resulting basic position.

[0133] As can be seen, the reinforcing part 57 is displaceable relative to the blade 3 both in the extension direction A and in the retraction direction E.

[0134] As can be seen particularly from the cross-sectional views in Figures 8 and 9, the receiving base 21 of the movable receptacle 19, which has the locking openings 47, is optionally completely closed and covered by the housing base 6. The locking can therefore be achieved in a concealed arrangement. The locking part 35 is located in a protected position within the respective movable carriage 30 or 31.

[0135] Furthermore, a space 63 extending in the longitudinal direction L, which can be exposed by removing the closure cap 11, can be provided between the receiving base 21 and the housing base 6 for receiving, for example, further blades 3 which are used for replacement.

[0136] The Figures 30 to 39 show a second embodiment of a knife 1 according to the invention.

[0137] For example, Figure 34 As can be seen, the housing 4 can have two shell-like parts, for example, an upper housing part 80 and a lower housing part 81. The two housing parts 80 and 81 can, as shown, be connected to one another via a locking mechanism to form the housing 4 as a whole. For example, one housing part can have locking pins 82 that interact in a locking manner with associated locking receptacles 83 of the other housing part. Additionally or alternatively, the housing parts can also be connected via one or more screws 84.

[0138] In this embodiment, the blade 3 is alternatively separately held in a locking position on the blade carriage 30. For this purpose, a locking projection 67 is provided, which is displaceable perpendicular to a wide-surface extension of the blade 3. This projection passes through a bottom opening 68 of the blade carriage 30 and is guided in the carriage with a stop limit, particularly in the direction of a locking position. In addition, the locking projection 67 is displaceable in the direction of a locking position according to Figure 39 spring-loaded. For this purpose, as also shown, a cylinder compression spring 69 can be provided, which is supported at one end on the locking projection 67 and at the other end on a cover section 70 of the blade carriage 30.

[0139] The locking projection 67 engages through the opening 68 into the blade opening 29 to secure the blade 3 to the blade carriage 30.

[0140] The free end face of the locking projection 67 can, as is also preferred, be formed in a roof-like manner, for example in a dome-like manner, in particular in a spherical dome-like manner, so that when a new blade 3 is inserted, the locking projection 67 is first automatically displaced into an evasive position against the restoring force of the compression spring 69 and can finally fall into the blade opening 29 via the compression spring 69.

[0141] In this embodiment, a blade change preferably occurs after moving the blade carriage 30 into a forward, preferably stop-limited position, so that such a blade change can be performed via the front opening 9 of the knife 1. In the first embodiment described above, a blade change occurs via the rear opening 10 after the travel path has been released by removing the closure cap 11.

[0142] The Figures 40 and 41show the knife 1 in a preferred blade-changing position. The blade carriage 30, together with the blade 3, is displaced into a stop-limited, frontmost position. In this position, the carriage part 32, in particular, can strike against an associated stop surface 87 of the housing 4 (see Figure 41 ).

[0143] In this position, the locking projection 67, which interacts with the blade 3, is associated with a button 86 provided in the lower housing part 81. This button 86 can be used to release the locking between the blade 3 and the blade carriage 30.

[0144] The button 86 is connected to a base section 89 via an arm section 88, for example, acting in a spring-like manner. The base section 89, arm section 88, and button 86 can, as is also preferred, be formed of the same material and in one piece.

[0145] The button 86 is secured to the housing 4, in particular to the housing lower part 81, via the base section 89. The button 86, which protrudes freely above the arm section 88, is movable about a geometric pivot axis preferably located in the region of the arm section 88. The pivot axis extends transversely to the longitudinal extent of the blade 3.

[0146] The pivoting of the button 86 takes place against a restoring force that builds up during the pivoting, for example of the spring-acting arm section 88. This accordingly preferably results in a spring-elastic reset of the button 86 in the direction of a basic position according to Figure 41 .

[0147] The button 86 is accessible from the underside of the lower housing part 81. Upon actuation of the button 86, it pivots in the direction of the facing locking projection 67. The facing button surface contacts the end face of the locking projection 67, whereupon, upon further pivoting of the button 86, the locking projection 67 is displaced against the force of the compression spring 69 such that the free, preferably dome-shaped end face of the locking projection 67 lies in the blade opening 29. In this position, the blade 3 can be pulled forward beyond the end opening 9, wherein the opening edge of the blade opening 29, in cooperation with the dome-shaped end face of the locking projection 67, pushes the locking projection 67 further into the release position.

[0148] In this position, the facing end face of the key 86 preferably lies below a plane defined by the underside of the blade 3. Accordingly, the facing end face of the key 86 does not engage, preferably not even partially, in the blade opening 29. This can be achieved, as also shown, by striking a key-side stop shoulder 90 against a housing-side counter-stop shoulder 91 (see Figure 42 ).

[0149] In the second embodiment, the closure cap 11 can serve solely to close the space 63 for accommodating replacement blades. In an alternative or combined configuration, the closure cap 11 can also limit the slide space to the rear, as in the first embodiment.

[0150] If the locking of the blade carriage 30 and / or the reinforcement part carriage 31 of the Figures 1-29illustrated first embodiment essentially in a direction perpendicular to the longitudinal direction L and thus essentially in a depth direction of the knife 1, this locking in the second embodiment is essentially in a width direction B viewed transversely to the longitudinal direction L.

[0151] Corresponding to the first embodiment, in the second embodiment, each carriage 30, 31 is essentially composed of a carriage part 32 and a wedge-slide part 34, wherein the wedge-slide part 34 is movable in the longitudinal direction L relative to the carriage part 32. Here, too, actuation is effected via an actuating part 33.

[0152] The locking of the respective carriage 30, 31 occurs due to the interaction of a carriage-side locking part 35 with locking recesses 71 provided on the inside of the wall of the narrow side 20 of the receptacle or on the inside of the narrow side 5 of the housing. These locking recesses 71 are arranged evenly distributed over the length, like the locking openings 47 in the travel receptacle 19 in the previously described embodiment.

[0153] By constructing the housing 4 from a metal material, for example, die-cast magnesium, zinc, or aluminum, a sufficiently stable design of the locking recesses 71 can be achieved directly on the housing 4. If the housing 4 is constructed from metal, a separate travel holder 19, as provided in the first embodiment described above, may be unnecessary.

[0154] The wedge slide part 34, which is also motion-coupled to the actuating part 33 in the second embodiment, can be displaced relative to the slide part 32, particularly with respect to the blade travel slide 30, against the restoring force of a spring 50, for example in the form of a cylindrical compression spring. A neutral center position of the wedge slide part 34 can be achieved via the spring 50.

[0155] Viewed in the longitudinal direction, the wedge slide part 34 is preferably provided with a locking projection 72 in the center and, pointing toward the locking recess 71. Viewed in the extension direction A, a displacement projection 73 is formed at a distance in front of the locking projection 72, and, viewed in the extension direction A, a further displacement projection 73 is preferably provided behind the locking projection 72.

[0156] The locking projection 72 and the two displacement projections 73 can, with reference to a plan view according to Figure 37, originate from a common end face of the wedge slide part 34, which appears linear in plan view. Between the locking projection 72 and the respective displacement projection 73, there is a pocket-like locking part receptacle 74, open at the edge in the direction of the locking recesses 71. Facing the central locking projection 72, the boundary of each locking part receptacle 74 is defined by a wedge surface 44. Both wedge surfaces 44 open into a pan-like support surface 75 of the locking projection 72.

[0157] The support surface 75 provides support for the locking part 35, which in the second embodiment is preferably designed as a ball 76, in the locking position. As an alternative to a ball 76, the locking part 35 can also be formed by a circular cylinder. In this locking position according to Figure 37The locking part 35 is caught between the support surface 75 of the locking projection 72 and an associated locking recess 71, so that the ball 76 is prevented from moving transversely to the extension direction A or transversely to the retraction direction E. The selected extended position or the retracted position of the blade 3 is thereby secured.

[0158] The ball 76 can also be captured in a recess 77 of a slide wall 78, viewed in the longitudinal direction L, such that the ball 76 can only perform a displacement in the width direction B. Such a displacement to release the locking is made possible by sliding the wedge slide part 34 in the longitudinal direction L or in the extension direction A or retraction direction E according to the first embodiment. By such a sliding displacement, a locking part receptacle 74 of the wedge slide part 34 is assigned to the locking part 35, or here the ball 76 (see Figure 38 ). During the further sliding displacement of the slide part 32 together with the wedge slide part 34, the ball 76 is dragged along by the displacement projection 73 in the displacement direction. Due to the pan-shaped design of the locking recesses 71, the ball 76 is forced out of the locking recess 71 into the locking part receptacle 74 (see Figure 38 ).

[0159] In this embodiment, too, upon release of the actuating part 33, the wedge slide part 34 can be spring-assisted back into the central position. In this case, the locking part 35, in particular the ball 76, is preferably moved outward in the width direction B. The ball 76 is pushed into the locking recess 71 via the wedge surface 44. Upon reaching the central position of the wedge slide part 34, the ball 76 is captured between the locking recess 71 and the support surface 75 of the locking projection 72. The locking position is thus reassumed.

[0160] Starting from the longitudinal side 79, from which the displacement projections 73 and the locking projection 72 extend, the displacement projections 73 preferably protrude by a greater dimension c than the locking projection 72 (dimension d). The resulting difference (dimension c minus dimension d) can correspond to approximately one-fifth of the largest extension dimension of the locking part 35 in the width direction B, i.e., according to the second embodiment, approximately one-fifth of the diameter of the ball 76. During a displacement process, each displacement projection 73 preferably loads the ball 76 in the region of an upper ball half facing the respective slide.

[0161] The extension arm 61 of the reinforcement part 57 can, like the design of the first embodiment, lie in a pocket-like recess of the carriage part 32 of the reinforcement part carriage 30. Additionally or alternatively, a possibly form-fitting holder can also be provided, for example, on a pin of the carriage part 32, for which purpose a bore-like receptacle 85 can be provided in the region of the extension arm 61.

[0162] The scope of the present invention is defined by the appended claims. List of reference symbols 1 Knife 29 Blade opening 2 knife handle 30 Blade carriage 3 blade 31 Reinforcement part carriage 4 Housing 5 Narrow side of the housing 32 Sled part 6 Case back 33 Actuating part 7 Housing cover 34 Wedge slide part 8 Slot opening 35 locking part 9 front opening 36 Receiving groove 10 rear opening 37 Box bottom 11 cap 38 box wall 12 Guide bridge 39 breakthrough 13 guide groove 40 breakthrough 14 stop 41 Waist section 15 Nut 42 Tenon section 16 Blade segment 43 Impact area 17 Predetermined breaking line 44 wedge surface 18 magnet 45 Feather 19 Traversing recording 46 Fastening element, part 20 Recording narrow side 47 locking opening 21 receiving base 48 Actuating surface 22 Receiving blanket 49 Carrying advantage 23 Slot opening 50 Feather 24 rear opening 51 Spring holder 25 front opening 52 projection 26 Section 53 Support surface 27 Recording 54 Recording pocket 28 cutting edge 55 spring section 56 magnet 82 locking pin 57 Reinforcement part 83 Snap-in mount 58 U-leg 84 screw 59 U-bridge 85 Recording 60 edge 86 button 61 boom 87 Stop surface 62 Recording 88 arm section 63 Space 89 Base section 64 contact surface 90 Stop shoulder 65 Support surface 91 Counter stop shoulder 66 locking pin 67 locking projection 68 opening 69 compression spring 70 Ceiling section A Extension direction 71 locking recess B Latitude direction 72 locking projection E Entry direction 73 Sliding projection L Longitudinal direction 74 Locking part holder 75 Support surface 76 Bullet 77 recess 78 Sled wall c measure 79 long side d measure 80 Upper case 81 Lower housing part

Claims

1. A knife (12) with a knife handle (2) and a blade (3), wherein the blade (3) can be extended and retracted relative to the knife handle (2), with a reinforcing part (57), on which an extended region of the blade (3) can be supported, wherein the reinforcing part (57) is displaceable relative to the knife handle (2) and detachably connected to the blade (3), wherein further, the knife handle (2) has a displacement receptacle (19) for a blade displacement carriage (30) that is connected to the blade (3), wherein further, the blade displacement carriage (30) has an actuating part (33) and a carriage part (32), characterized in that the actuating part (33) can be moved relative to the carriage part (32) in the longitudinal direction (L)in that the blade displacement carriage (30) is essentially composed of the carriage part (32) and a wedge carriage part (34), the wedge carriage part (34) being movable in a longitudinal direction (L) relative to the carriage part (32) when actuated via the actuating part (33), and in that the latching of the blade displacement carriage (30) takes place as a result of an interaction of a carriage-side catch part (35, 76) with catch depressions (71) provided on the inner wall side of the narrow housing side (20) or the inner wall side of the narrow housing side (5), wherein these catch depressions (71) being arranged uniformly distributed over the length.

2. The knife according to claim 1, characterized in that a catch projection (67), which is realized separately of the catch part (35), is provided on the blade displacement carriage (30) and penetrates the blade opening (29) in order to retain the blade (3), wherein the catch projection (67) can be loaded into the catching position by means of a spring (69).

3. The knife according to claim 2, characterized in that acatch retention of the blade (3) on the catch projection (67) of the blade displacement carriage (30) can be disengaged by actuating a button (86) provided on the housing.

4. The knife according to one of the preceding claims, characterized in that the actuating part (33) interacts with the carriage part (32) by means of a spring (50) acting in the longitudinal direction (L).

5. The knife according to claim 4, characterized in that the spring (50) is supported in the carriage part (32) with both ends, but can be lifted off a respective supporting surface (53) by the actuating part (33) when the actuating part (33) is acted upon in the longitudinal direction (L).

6. The knife according to one of the preceding claims, characterized in that a closing cap (11) is arranged on the knife handle (2) on the back to the blade (3), wherein said closing cap closes the displacement path for the blade displacement carriage (30) and / or the reinforcing part displacement carriage (31).

7. The knife according to claim 6, characterized in that the closing cap (11) is fastened on the knife handle (2) in a sliding manner transverse to the longitudinal extent.

8. The knife according to claim 6, characterized in that that the closing cap (11) is retained on the knife handle (2) in a pivoting or folding manner.

9. The knife according to one of the claims 6 to 8, characterized in that the closing cap (11) has a groove (15), which is exposed toward the outside, in order to make available a snap-off aid when the closing cap (11) is removed.

10. The knife according to one of the claims 6 to 9, characterized in that a magnet (18) is arranged in the closing cap (11) in association with the groove (15) in order to retain a snapped off blade segment (16).

11. The knife according to one of the preceding claims, characterized in that the catch part (35, 76) is movable transverse to a displacement direction of the blade displacement carriage (30) and / or the reinforcing part displacement carriage (31) in order to realize its respective disengagement or engagement.

12. The knife according to one of the preceding claims, characterized in that the catch part (35, 76) is a ball (76) or a cylinder.

13. The knife according to one of the preceding claims, characterized in that the blade displacement carriage (30) and / or the reinforcing part displacement carriage (31) has on a longitudinal side (79) a catch projection (72) for interacting with the catch part (35, 76) in a catching position.

14. The knife according to one of the preceding claims, characterized in that the blade displacement carriage (30) has a displacement projection (73) for interacting with the catch part (35, 76) in a release position.

15. The knife according to claim 14, characterized in that the displacement projection (73) protrudes farther than the catch projection (72) in the width direction (B).