SI21997A - Knife with removable blade - Google Patents

Abstract

Subject of the invention is a knife with removable blade (2), which due to the adjustment in each corresponding position and also in the case of replacement can be moved in the longitudinal direction of the knife. The advantage of the knife according to the invention is that on one side during cutting the blade (2) is firmly held in the selected position, while on the other it allows a quick shift or replacement of the blade (2) prior to cutting or after it, while subsequently it can be fastened in the required position. For this purpose the knife includes a holder (1), which in its longitudinal direction holds a moving blade (2) in the corresponding guide (113) which can be fastened in any required position, and can be form-fittingly attached with a control assembly (10) which can also be moved in the direction of the holder (1). The holder (1) consists of at least a guide part (11), which is provided for receiving and guiding the blade (2) and a pressure part (12), which is swivellingly connected to the guide part (11), which is optionally by way of a locking mechanism (13) locked to fit the blade (2) and/or the aforementioned guiding part (11).

Description

Interchangeable blade knife

In the field of processing, the invention relates to hand-held cutting tools, namely knives, and in particular to knives with interchangeable blades.

The invention is based on the problem of how to change the knife with a replaceable blade which, due to its adjustment to the respective position and even in the case of a changeable displacement in the longitudinal direction of the knife, is such that, on the one hand, the blade is held firmly in the selected position as much as possible. position, on the other hand, as soon as possible before and after cutting should also allow for quick and easy moveability or. interchangeability of the blade and then re-hardening the blade in the position selected.

Numerous knife solutions are already known in the art. Thus, JP 2003071153A, US5,269,063, US D443,494, USD443,807 (all Olfa Corporation) or AT 350 373 (Stanley Tools Limited) discusses different designs of interchangeable blade blades, in principle each blade consists of a housing or . a handle in which the blade guide is provided in cross section as profile C and on which the blade control means, which in most cases is implemented as simple as possible, has a sliding control knob along the holder.

The blade itself is made in all the above cases as a distinctly elongated, rhomboid shaped and also markedly flattened strip, one longitudinal edge of which is unilaterally sharpened, and the remaining longitudinal edge is either top or left. perpendicular. In this case, the term edge actually refers to the lateral or frontal surface as a strip of designed blade whose height is insignificant in comparison to its length. The blade is inserted into the knife in such a way that a sharp angle is formed between the sharpened longitudinal edge and the front edge outside the knife body, forming a cutting tip so that the length of the sharpened edge projecting from the housing is generally longer than the length of the blunt edge projecting from the knife body. Further, the blade is provided with abutments, which are designed as oblique with respect to the longitudinal edges, as a rule, parallel to the leading edges of the blade of a running notch on the blade surface. Said impairments are preferably equidistantly distributed over the two dominant surfaces of the blade and coincide on each side of the blade so that the bumps on one surface are located directly below / above the edges on the opposite dominant surface. Said bumps are divided into segments that are otherwise firmly connected, but after wear of the cutting tip or cutting edge, one segment of the cutting edge of the cutting blade can be broken off and then resumed in the area of the further segment, i.e. again with a sharp cutting tip or. sharpened cutting edge.

Furthermore, in the case of knives, according to the previously cited patent documents, the blade at the end intended to be housed and therefore not protruding from the housing during use is provided with a through hole provided for engagement with the blade control means. This means allows both the blade to be held in the position selected and the blade moved in the longitudinal direction of the blade housing. The control means is usually implemented as a control knob which is inserted on one side into said guide in the blade housing and is movable in the longitudinal direction of the blade, and on the other hand comprises a corresponding pin or similar element which can be inserted into said through hole of the blade. Furthermore, the blade control means is adapted to be fixed in the respective position, thereby simultaneously attaching the blade to the position selected in each position. In some embodiments, the position can be selected stepwise, e.g. in equidistant positions arranged along the knife, whereby the distance between the two adjacent anchor positions may e.g. corresponds to the distance between said cuts on the blade and, in certain embodiments, the blade is infinitesimal, i.e. in any blade position along the blade. A stepwise position selection method is feasible e.g. in such a way that one of the edges is provided with equidistantly spaced bushings as profile C of the designed blade guide and control knob, while equidistantly spaced projections are provided in the corresponding edge of the control knob sliding along said edge of the guide. When the button is released, its projections engage the bushes, and by pushing the control button, the aforementioned connection between the bus and the button is temporarily removed, and then it is automatically restored after moving the button and the blade to another suitable position. The infinitesimal way of fastening the knob and thus the blade is e.g. so feasible that the button is provided with a thread which releases the button after unscrewing, and by screwing the button and stem also lock the blade in the selected position.

Such knives are widely used and multi-knives can serve their purpose in many different applications. However, in certain circumstances, their use can lead to problems associated with the lack of precision control of the cutting tip or even inadvertent or uncontrolled extraction of the blade, ultimately even to a serious risk of injury. Due to the unobstructed movement of the blade in the longitudinal direction of the blade, a relatively large clearance is available between the blade and the guide with which the blade is guided, namely the end region of the guide from which the blade protrudes. On the other hand, the blade is relatively flexible and, as said, extremely flattened and therefore also very flexible in the transverse direction, which, given the aforementioned clearance, means that the blade in the transverse direction is difficult to control even when the cutting tip is close to said the end of the guide from which it protrudes. The inability to control the blade effectively and accurately when cutting can quickly lead to relatively large deviations from the desired direction or direction. lines. On the other hand, it is obvious that the blade is held in the position selected in such a way that the blade is only freely movable in the guide, and is connected to the control knob which is held in the position selected. During cutting, in addition to the aforementioned unfavorable forces in the transverse direction and bending deformations of the blade, a force component acting in the longitudinal direction of the knife appears and shows a tendency to pull the blade out of the guide or. housings. So e.g. while cutting thicker materials, e.g. of cardboard, linoleum or plastics, especially those with a large friction coefficient, but simply by striking the blade in the available base, the force on the blade in the longitudinal direction of the knife can quickly reach such a strength that it either causes an unintentional movement in the selected position of the fixed control knob. or even disconnects the managed button and blade. In both cases, the result is a sudden inadvertent pull of the blade from the guide, at least to a certain extent, which is immediately reflected in the total loss of control over the direction of movement of the active area of the cutting edge, or. the cutting tips, but at the same time combined with the aforementioned transverse forces, the bending deformations of the blade may be increased to such an extent that a portion of the blade suddenly breaks. In such a case, the direction of movement of the broken piece is relatively flexible, sharp and with the cutting tip of the completed blade, which undoubtedly indicates a realistic possibility of causing serious injury to either the user or persons or objects in the surrounding area.

For the avoidance of this, AT 359 394 (Stanley Tools Limited) proposes a knife solution in which a holder or a knife is used. the housing consists of two parts which can be e.g. articulated in the posterior region of the knife. In the first part there is a guide in which, after the second part is diverted, a blade is inserted, with which it is locked again thanks to a through hole in the blade - a connected slide, which, like the blade itself, is guided in said guide and is provided with an appropriate control knob for moving the blade. in the longitudinal direction of the knife. The upper part of the holder, which comprises a longitudinal groove for receiving the control knob of said slide, is provided with slopes extending upwards, i.e. away from the bottom and back i.e. away from the cutting tip. On the other hand, the lower part of the holder on the sides is provided with projections which are adapted to cooperate with the said obliques of the upper part. In the rear region of the lower portion, a clamp is provided for moving the upper portion when it is positioned over the lower portion, more precisely, for pushing the upper portion in a longitudinal direction, namely towards the cutting tip.

When a blade and then the slider thereafter are inserted into the guide at the lower end, the slider is connected to the blade by means of a suitable stud. When the upper part of the holder is mounted over the lower part of the holder, the control knob of the slider extends through the groove in the upper part out of the holder. Said nozzles on the sides of the lower part are located directly adjacent to the said slopes along the sides of the upper part of the holder. By moving the slider control knob, it is possible to move the blade in the longitudinal direction of the blade, in which position both parts of the holder are still detachable and allow npt. blade replacement.

In this position of mutual contact of the two parts with the clamp, the upper part is moved along the lower part in the longitudinal direction of the knife, in the direction towards the tip, with the attachments of the lower part of the holder resting on the corresponding oblique upper part, which causes the upper part to clamp to the lower part. This grip should be particularly pronounced in the front, cutting area of the knife, keeping the clamped blade between the two portions in each position selected. In this case, it is important to note that in this case the blade in each position is movable by means of a control knob, both parts of the holder having to be at least partially open while the blade being held in each position thanks to the pressure between the two parts of the holder, which is created by the presence of the said attachments and the said slopes and as a result of the displacement of the upper portion along the lower portion.

The design of said bevels and associated attachments, at least theoretically, allows the necessary pressure to be created between the two parts of the holder and thereby to hold the blade in the position selected in each case, especially assuming that it is a careful and accurate implementation of the bevels and attachments, as well as the upper part holders sufficiently and also with sufficient force pushed along the bottom. Since there is virtually no clearance between the two parts of the holder where the blade protrudes from the blade, the guiding tip of the blade should therefore be at least theoretically excellent. It is disturbing that after adjusting the blade, the position is always selected when the cutting tip is already selected in the selected manner. for the selected distance it protrudes from the holder, subsequently it is inevitable to move the upper part of the holder along the lower part of the holder and therefore along the blade, which inevitably results in the tip of the blade no longer projecting from the distance holder as previously selected, but since then, the distance from the upper part to the lower part is shorter, which in practice is a few mm, e.g. about 3 mm.

On the other hand, the force between the two parts of the holder, which is achieved by the clamp to move the early part, is entirely dependent solely on the moment of clamping of the clamp, which in each case is chosen entirely subjectively or. left to the senses of each user. In case of incomplete or. insufficient tightening of the clamp immediately leads to a drastic decrease in pressure between the parts of the holder, and the blade is then easily moved in the longitudinal direction of the knife holder.

In practice, however, it still turns out that over time or. in certain circumstances, even the tight tightening of the clamp no longer allows the blade to be held securely in the position selected. It should be borne in mind that the blade is already purchased at the time of purchase. the corrosion protection is often oiled and that the two parts of the retainers are made of corrosion-resistant light alloys suitable for injection molding and / or have to meet different technological, economic or other requirements. The performance of the aforementioned slopes and attachments, which are crucial for the operation, must nevertheless be extremely precise, otherwise the achievement of the intended pressure between the parts of the holder is immediately called into question. In this context, the question of ensuring the geometry and dimensions in the area of slopes and fittings during the use of the knife itself is certainly in place, when the two parts of the holders in relatively small surface areas of slopes and projections do not carry only the forces that are transformed into the necessary mutual pressure due to compression of the blade, but also some other loads, e.g. force in the longitudinal direction, which creates a tendency for the blade to be pulled out, further forces in the transverse direction that cause, among other things, the bending of the blade, and other forces that occur or occur. it could also occur during completely regular use of the knife. All these forces, however, can lead to considerable elastic and eventually plastic deformation in the area of slopes and / or the latter cooperating attachments, which is reflected in the drastic reduction of pressure that can be achieved at all between the two parts of the holder, and thus in the reliability of holding the blade in each position selected.

The present invention relates to a knife with an interchangeable blade, said knife comprising a holder consisting of at least two parts and in which a cushioning blade which is movable and in each position selected in the longitudinal direction is held in the longitudinal direction, in particular as a highly flattened strip with parallel dominant surfaces designed and at least one longitudinal cutting edge arranged with at least one cutting edge comprising the cutting blade. Said blade is interconnected formally with the movable control means in the longitudinal direction of the holder, except that the insert is removable or removable at said holder at the cutting end of the holder.

The knife holder according to the invention consists at least of a guide piece intended to receive and guide the blade, and thus a guide part in a pivotally coupled pressure part, which is optionally held in contact with the blade and / or said guide by means of a suitable locking means. part. The guiding part of the holder is provided with a pivot in which the pressure part of the holder, which consists of a relatively rigid one, is pivotally mounted with its bearing means for cooperation with the arrested means adapted to one side of the pivot or. the bearing means disposed and the contact surface to support the blade of the control arm, as well as the extremely flexible, to fit on the blade adapted and on the opposite side of the pivot or. a bearing means of a spaced pressure arm comprising a contact surface for engaging the blade. The contact surface of the guide portion is preferably disposed at the extreme, from the pivot point as far as possible, the cutting end of the guide portion of the holder, while the contact surface of the pressure portion of the holder is disposed at the far end of the pivoting pressure portion of the holder from the bearing means. Various embodiments of said contact surfaces are available, so that at least one of the contact surfaces is either flat and smooth or e.g. embossed so as to include at least one directed projection of the blade surface, and it is also possible that at least one of the contact surfaces is provided with an additional layer to increase the friction and / or adhesion to each respective blade dominant surface. Further, the limited guide portion preferably includes a guide, which consists of a blade guide and a guide of the control means for moving said blade in the longitudinal direction of the holder. Said guide element is preferably completed at a distance from the cutting end of the guide member of the holder. Said arresting means essentially consists of at least a snap edge disposed on the holding end of the guide portion of the holder and a snap tongue disposed on the control arm of the swivel pressure portion of the holder. Preferably, the latching edge is provided on a release means, which is either rotatably or translationally movable at the holding end of the guide portion of the holder.

The invention will now be explained in more detail with the embodiment shown in the accompanying drawing, where FIG. 1 knife according to the invention, illustrated in perspective and ready for use; FIG. 2 a knife according to FIG. 1, again in perspective, but during blade insertion; FIG. 3 is the detail A of FIG. 1, FIG. 4 knife, while moving the blade, in longitudinal section;

FIG. 5 is a longitudinal cross-sectional view of a knife in outline and ready for use, FIG. 6 shows a swivel portion of the holder, comprising features in accordance with a further embodiment of the invention, in an outline;

FIG. 8 Swivel mounting part of the knife holder in the floor plan.

The knife according to the invention basically consists of a holder 1 and a removable blade 2, which is generally insertable or, respectively, into said holder 1. optionally also removable from the holder 1, but in principle it is movable along the holder 1, but at the same time it can be secured in the position selected in each case. to secure against further movement.

In the embodiment shown, the classic, distinctly flattened, rhomboid-shaped steel strip uses a replaceable blade 2 (Fig. 2), one longitudinal edge of which is sharpened and made as a cutting edge 20, while the associated transverse edge 21, which together with said sharpened cutting blade the edge 20 forms a cutting tip 22, extends obliquely and at an acute angle with respect to said cutting edge 20. In at least a certain area, at least one dominant surface 23 of the blade 2 near the cutting tip 22 and the cutting edge 20 are available at least substantially transversely, especially in parallel with said transverse edge 21, currents and preferably equidistantly distributed abutments 23 defining segments 24 of the blade 23 that are brittle after wear of the cutting edge 20 or only the cutting tip 22, i.e. removable by refraction, thereby activating a properly sharpened cutting edge of 20 oz. usable cutting tip 22 of each adjacent segment 25 of blade 2.

Further, the blade 2 on said dominant surface 23 is provided with a through hole 26, which is provided for holding the blade 2 and in particular for establishing a suitable barrier connection between the blade 2 and the associated holding element, e.g. control knob 10 by which it is possible to either move the blade 2 in the longitudinal direction of the holder 1 or. the said blade 2 must also be held in the position selected at least in certain embodiments of such blades.

In the knife of FIG. 1 to 7, according to the invention, is a characteristic holder 1 consisting of a guide part 11 and with respect to the latter a swivel pressure part 12.

The guide portion 11 is provided for receiving and guiding the blade 2 and for this purpose comprises a longitudinal guide 113 formed by the blade guide 113 'and the control knob 113 of the control button 10. At the cutting end 111 of the guide portion 11, where insertable into the guide portion 11 oz. it protrudes from it and, while using the knife, protrudes at least the cutting tip 22 with the associated cutting edge 20 of the blade 2; supporting blade 2, wherein the term contact surface 114 may also mean only the corresponding contact edge.

Said guide 113 is configured in the example shown such that the guide 113 of the control knob 10 is terminated at a distance from said cutting end 111 of the guide portion 11 of the holder 1, while the guide 113 'of the blade 2 extends to said contact surface 114 to engage the blade 2. the button 10, which is slidably movable along the guide 113 in the guide portion 11 of the holder 1, extends beyond the holder 1 a gripping surface 101 which is ergonomically shaped and adapted to engage the finger, as well as an insertable retaining nozzle 102 arranged inside the holder 1 into said through hole 26 of blade 2, such that after inserting the blade 2 into the guide 113 'between the blade 2 and the button 10, there is a form-locking connection. However, it should already be made clear that, with the knife according to the invention, the control knob 10 is intended solely to move the blade 2 along the holder 1 and not to hold the blade 2 in the position selected during the cutting.

Further, at a suitable distance from said contact surface 114, a suitable pivot 115 is provided, in which the previously pressed part 12 of the holder 1 is appropriately pivoted, in such a way that the pressure part 12 is rotatable one way towards the cutting end 111 guide part 11 and, on the other hand, can be fixed in the reclining position on the blade 2 or. at the cutting end 111 of guide portion 11 of holder 1.

In the example shown, said pivot 115 is arranged at the cutting end 111 of the guide portion 11 of the holder 1, but at a suitable distance from said contact surface 114 to support the blade 2.

Accordingly, the pressure part 12 of the holder 1 consists of a suitable bearing means 125, by means of which said part 12 is pivotally mounted in the pivot 115 of the guide part 11 of the holder 1, as well as of two arms 121, 122, namely of the pressure arm 121, which is arranged on one side of the pivot 115 oz. bearing means 125 in the area of the guide portion 11 of the holder 1, and the control arm 122 disposed on the opposite side of the pivot 115, respectively. bearing means 125 and adapted for controlling said pressure arm 121. An appropriate contact surface 124 is provided on the pressure arm 121, and this term can also take only the corresponding contact edge.

In this example, the bearing 115 in the guide portion 11 of the holder 1 is made of two projecting projections 1 in the transverse direction of the holder, while the bearing means 125 on the pressure portion 12 form two individually facing recesses. In any case, a reverse embodiment is also possible, in which the bearing 115 forms recesses and the bearing means a nozzle, and other embodiments of the pressure portion 12 of the holder 1 to 1 are possible. to Leadership 11, which is not essential to the invention itself.

To secure the pressure part 12 in the reclining position on the guide part 11, and in particular in the position of the pressure arm 121 on the cutting end 111 of the guide part 11, a suitable arresting means 13 is provided on the holder 1, which in the present case consists of a snap edge 131, which is made as an exposed transverse edge and disposed at the holding end 112 of the holder 11, further from the snap tongue 132, which is available in the end region of the control arm 122 of the pressure part 12, as well as from the release means 133, by means of which the pressure part 12 is possible. to release from the snapped or. of the arresting position on the guide portion 11, thereby allowing it to be rotated in the pivot 115 relative to said guide portion 11. In the embodiment shown, the snap edge 131 is mounted on the release means 133 disposed in the region of the holding end 112 and after sufficient pressure is applied thereto. as rotating counterclockwise.

The guide portion 11 of the holder 1 is designed to be relatively rigid, either single or integral, intended to receive and guide it in the guide region 113 'of the inserted blade 2 and at the same time to rigidly and reliably support said blade 2 in the region of the abutment surface 114 on the cutting blade. end 111 of guide portion 11.

On the other hand, the pressure portion 12 in the area of the control arm 122 is made as rigidly as possible, while the pressure arm 121 in the region of the cutting end 111 is as flexible as possible.

Each of said contact surfaces 114, 124, namely, contact surface 114 on guide portion 11 or. the contact surface 124 on the pressure portion 12 is substantially intended to fit on the respective dominant surface 23 of the blade 2, and for this purpose is made either as a flat and smooth surface or as a ribbed surface or similarly shaped additional holding surface elements, or optionally also provided with at least one additional surface layer

123 or application (Fig. 6) to increase the friction and / or adhesion between this contact surface 114, 124 and the blade 2.

When the pressure part 12 is removed from the guide part 11, the control knob 10 is freely movable on the associated guide 113 along the holder 1, while at the same time a blade 2 can be inserted into the guide 113, namely into the guide 113 'of the blade 2. of the control knob 10 into the through hole 26 of the blade 2, this blade 2 along the guide 113 'or. In this state, the blade 2 can be easily pulled out of the holder 1 or pushed into the holder 1 to the extent that the desired cutting edge length of 20 or 10 extends from the holder 1 in such a condition. that the desired distance of the cutting tip 22 of the blade 2 is established from the cutting end 111 of the holder 1. Then, the pressing part 12 is rotated to snap by means of an isthmus means 13, in which case the snap tongue 132 on the rigid control arm 122 of the pressure part 12 snaps into place the edge 131 of the holding end 112 of the guide portion 11. From then on, the pressing part 12 fits snugly against the guide portion 11, the two parts 11,12 forming a knife holder that is conveniently and ergonomically shaped in a completely appropriate manner, which enables, among other things, precise handling. At the moment of the mutual arrest of the two parts 11 and 12, due to the rigidity of the control arm 122 and also its flexibility, the pressure arm 121 of the pressure part 12 with its bearing surface 124 is pressed relatively tightly against the corresponding surface 23 of the blade 2, which in turn is also pressed against the bearing surface 114 of guide portion 11. In this way, at the moment of arrest, a secure holding of the blade 2 is established between the two contact surfaces 114, 124 and thus prevents any further movement of the blade 2 in both the transverse and longitudinal directions of the knife holder 1. It is to be noted that the said contact surfaces 114, 124 are located below / above each other and therefore the distance of the cutting tip 22 of the blade 2 from the cutting end 111 does not change after the arresting of both parts 11,12 of the holder 1. Furthermore, due to the suitably selected resilience of the pressure arm 121 of the pressure portion 12 against firmly pressing it against the blade 2, any excessive deformation is excluded, which means that the pressing of the contact surface 124 against the blade 2 is necessary even after prolonged use of the knife.

After using the knife, it is possible - however, exclusively on the knife. the desired way - to achieve the movability of the blade 2 in the longitudinal direction of the holder 1 by simply pressing the expander 133, in which case the expander 133 is rotated to such an extent that the edge 131 is displaced by the tongue 132 and then pressed due to the flexibility of the pressure arm 121 the part 12 of the holder 1 is automatically unscrewed from the guide part 11 of the holder 1, and from then on it is possible to move the blade 2 along the holder 1 by means of the control knob 10, while at the same time it is possible, e.g. also blade replacement

Claims (12)

PATENT APPLICATIONS A knife with a removable blade (2) comprising a holder (1) comprising at least two parts (11, 12) and in which, in the corresponding guide (113), it is movable in the longitudinal direction of the holder (1) and in each position selected fixable, as a distinctly flattened strip with parallel dominant surfaces (23) designed and at least one longitudinal cutting edge (20) arranged with at least one adjacent cutting tip (22) comprising a blade (2) which is also articulated in connection with the longitudinal direction of the holder (1) the movable control means (10) of the blade (2), and insertable or removable into said holder (1) at the cutting end (111) of the holder (1), characterized in that the holder (1) consists of at least a guide portion (11), which is intended for receiving and guiding the blade (2), as well as from the said guide part (11) in a pivotally connected pressure part (12), which is optionally held in a suitable isthmus means (13) in fitting to the blade (2) and / or said conduit on the part (11). Knife according to claim 1, characterized in that the guide part (11) of the holder (1) is provided with a pivot (115) in which the pressure part (12) of the holder (1) is pivotally supported by its bearing means (125). , consisting of a relatively rigid device for cooperating with an arresting means (13) adapted and on one side of the pivot (115) or. the bearing means (125) arranged and the contact surface (114) to support the blade (2) of the enclosing control arm (122), as well as the highly flexible, recessed blade (2) arranged on the opposite side of the pivot (115) or. the bearing means (125) of the disposed pressure arm (121) comprising a contact surface (124) adapted to engage the blade (2). Knife according to claim 1 or 2, characterized in that the contact surface (114) is disposed at the extreme, from the pivot point (115) as far away from the cutting end (111) of the guide portion (11) of the holder (1), the contact surface ( 124) at the extreme end of the pressure part (121) of the swivel pressure part (12) of the holder (1) at the furthest end of the pressure means (125). Knife according to one of claims 1 to 3, characterized in that at least one of the contact surfaces (114, 124) is flat and smooth. Knife according to one of Claims 1 to 3, characterized in that at least one of the contact surfaces (114, 124) is embossed and comprises at least one projecting projection (23) of the blade (2) corresponding to the respective surface (23). Knife according to one of Claims 1 to 3, characterized in that at least one of the contact surfaces (114, 124) is provided with an additional layer (123) for increasing the friction and / or adhesion against the respective dominant blade surface (23). (2). Knife according to any one of the preceding claims, characterized in that the guide portion (11) includes a guide (113) consisting of a blade guide (113 ') and a guide (113) for the blade movement means (10). (2) in the longitudinal direction of the holder (1). Knife according to claim 7, characterized in that the guide (113) of the control means (10) is terminated at a distance from the cutting end (111) of the guide part (11) of the holder (1). Knife according to one of the preceding claims, characterized in that the arresting means (13) consists of at least a snapping edge (131) disposed at the holding end (112) of the guide portion (11) of the holder (1) and the snapping tongue (132) arranged on the control arm (122) of the swivel pressure portion (12) of the holder (1). Knife according to claim 9, characterized in that the locking edge (131) is provided on the release means (133) which is mounted on the holding end (112) of the guide portion (11) of the holder (1). Knife according to claim 10, characterized in that the release means (133) is pivotably mounted on the guide portion (11) of the holder (1). Knife according to claim 10, characterized in that the release means (133) is translationally movable mounted on the guide portion (11) of the holder (1).