Messer

Abstract

The invention relates to a knife (10) with a housing (12) and with a blade (11), wherein the blade (11) is movable relative to at least a part of the housing (12) between a safety position, in which at least a part of the blade (11) is protected inaccessibly by the housing (12), and a cutting position, in which at least a region of a cutting edge (36) of the blade (11) protrudes from the housing (12), wherein a return element (43) loads the blade (11) or the housing (12) into the safety position, wherein a handle region of the knife (10) is formed on a first end region (17) of a rod (13) and wherein the blade (11) is arranged on a second end region (18) of the rod (13), wherein by means of the rod (13) the user can guide the knife (10) outside a danger zone in which the material to be cut is located. The special feature is that the knife (10) can be locked in at least one of the safety position, cutting position and blade change position by means of a locking device (30) which is movable between a locking position and a release position, wherein the housing (12) has at least one actuation (19, 24) by means of which the locking device (30) can be adjusted between the locking position and the release position.

Description

[0001] The invention relates to a knife.

[0002] The present invention relates to a knife which is used in a hazardous working environment in which the user should not be near the material being cut for safety reasons. For example, contact with the material being cut can be harmful or cutting it open can release dangerous goods, as is the case when cutting big bags. With hanging loads, e.g. hanging big bags, there is a risk that the contents will fall out, which could injure the knife user. A big bag may also have to be opened, e.g. above a conveyor system, in which case there is a risk that the knife user could fall into the conveyor system. The user should therefore stand at a distance from the material being cut and the knife must be able to bridge the distance.

[0003] Such a knife is known from EP 2 890 531 A1. The blade of this knife is arranged at an end region of a rod, allowing the user of the knife to position themselves at a distance from the blade and thus also from the material to be cut. The knife has a housing in which a blade device with a cutting edge is movable about a pivot axis between a safety position and a cutting position. In the cutting position, at least a portion of the cutting edge protrudes from the housing, and in the safety position, the cutting edge is arranged inaccessibly within the housing.

[0004] The blade can be moved between the safety position and the cutting position by means of an actuating device. The actuating device comprises a handle for actuating the actuating device. A holding area, where the user can hold the blade, is formed at a first end of a rod. The housing is arranged at a second end of the rod. The rod can bridge a distance between the material being cut and the user of the blade, allowing the user to stand outside the danger zone.

[0005] IT RM 20080600 A relates to a cutting tool for branches, shrubs, and the like, comprising an annular cutting tool, e.g., a chain, operable along a corresponding guide, e.g., a rail. These devices consist of a guide rail for the cutting chain, typically elliptical, and a motor that causes the chain itself to slide along said rail. Generally, a single device is not suitable for fully meeting the cutting requirements of these diverse applications. This means that it is necessary to have a variety of different cutting tools, or that cutting and pruning operations cannot be optimally performed with a single tool.The cutting tool comprises means for partializing the cutting tool, wherein the partializing means comprise a first and a second partializing element, each adapted to shield one or more corresponding portions of the cutting tool from contact with the body to be cut. The first and second partializing elements are movable relative to the cutting tool and also relative to each other in order to selectively shield the portions of the cutting edge of the tool.

[0006] DE 1 892 054 U describes a fixed knife whose handle forms a solid shaft when opened despite movable joints.

[0007] WO 2018 / 046141 A1 relates to a garden tool, such as pruning shears. The tool comprises a rod with a first end, with a working area connected to the first end. Furthermore, the tool comprises a hook area for gripping branches.

[0008] US 2019 / 0358840 A1 concerns a knife with a pivoting blade guard that can be used to cover one of the blade's edges. The blade guard can be releasably locked. The force required to move the blade guard is also adjustable.

[0009] The object of the invention was to create a knife with a holding area arranged away from the cutting edge, which is equipped with a safety function that prevents injuries to the user on the cutting edge, but which is simplified in terms of its manufacturing effort.

[0010] The problem was solved by a knife having the features of claim 1.

[0011] The knife comprises a housing and a blade. The blade is movable relative to the housing between a safety position and a cutting position. The blade is, for example, fixed relative to a base element, and the housing is movable relative to the blade. Alternatively, the housing is fixed relative to the base element, and the blade is movable relative to the housing. The base element can, for example, be a portion of the rod or a separate part attached to the rod.

[0012] In the safety position, at least a portion of the blade is protected from access by the housing. In the cutting position, at least a portion of the blade's cutting edge protrudes from the housing. A return element forces the blade or the housing into the safety position.

[0013] A handle portion of the knife is formed at a first end portion of a rod, and the blade is located at a second end portion of the rod. The rod allows the user to guide the blade away from the danger zone where the material being cut is located.

[0014] At least in the cutting position, the knife can be locked by means of a locking device that is movable between a locking position and a release position. This means that either a movement of the housing or a movement of the blade can be locked in the cutting position. A movement of the housing or the blade can also be locked in other positions, e.g., in the safety position and / or the blade change position.

[0015] The locking device comprises at least one actuation by means of which the locking device can be adjusted between the locking position and the release position.

[0016] One advantage of the knife is that it allows the user to stand outside the danger zone while performing a cutting operation that must be performed within the danger zone. The knife can be manually moved into the cutting position in a controlled manner and returned to the safety position after the cutting operation, without moving the blade near the user.

[0017] The actuation is designed, for example, in such a way that it can be actuated by a pressure force on the actuation. The pressure force can, for example, be applied in the direction of the base element. In this way, after a cutting operation, with the knife in the cutting position, it is possible to carry out the actuation by striking it against a fixed part or a part with high inertia and thus move the knife back into the safety position. In order to activate the actuation by striking it, the actuation can, for example, protrude in relation to the housing. This can prevent the user from moving the blade close to themselves after the cutting operation in order to move the knife into the safety position, which could already result in injuries.

[0018] An advantageous embodiment provides for a first actuation on a first side of the blade and a second actuation on a second side opposite the first side. In this case, the adjustment can be performed by an actuation on a first side of the blade or on a second side. Depending on the location of a suitable object in the room, the actuation can then be performed on the right side of the blade or on the left side.

[0019] For example, the knife has a two-armed lever that forms a pivot joint with a base element of the knife. A handle for adjusting the lever is assigned to a first lever arm of the knife. A second lever arm is assigned to the housing or the blade, for example. With this design, the knife can be adjusted between the safety position and the cutting position using the handle without any part of the user's body having to be in the immediate vicinity of the blade. Despite manual adjustment between the safety position and the cutting position, the risk of injury is reduced.

[0020] The rod, for example, is telescopic and has a first part and a second part that can be moved relative to the first part. The distance between the knife user and the material to be cut can be adjusted in this way. If the distance between the material to be cut and a suitable position for the knife user is greater, the rod can be lengthened, and if the distance is closer, it can be shortened.

[0021] The second part of the rod can be locked relative to the first part in different relative positions by means of a locking device. The set length can be secured in this way so that it does not change unintentionally. The locking can be achieved, for example, with a collet chuck or, for example, with a positive locking mechanism between the first part and the second part. For example, a locking element can be provided on one of the parts, which can be releasably engaged with at least one locking recess, in particular with a plurality of locking recesses, on the other of the parts.

[0022] The base element, e.g., a plastic base element, is connected to a functional part for stiffening. This allows for easy production of the base element using the plastic injection molding process. Sufficient rigidity is achieved by means of the functional part. The functional part has the shape of a plate or a rod, for example. The functional part can be equipped with additional features, for example.

[0023] The functional part is made of a material with high rigidity, e.g. metal or a fiber-reinforced plastic.

[0024] For example, parts of the locking device are assigned to the functional part. This can be, for example, at least one locking recess or a stop surface for the locking bolt.

[0025] For example, the functional part forms a ram, which forms a blunt element for positioning the material to be cut and protrudes from the base element. The ram can be used to position the material to be cut, e.g., a big bag, in the cutting position.

[0026] The functional part and / or the blade can be accommodated in a seat of the base element in such a form-fitting manner that it has only one degree of freedom in the translational direction or in the pivoting direction. The functional part or the blade can then be easily locked in the seat by blocking the last degree of freedom.

[0027] At least one actuation is designed, for example, as a two-armed lever, with a first lever arm comprising an actuation area and a second lever arm comprising an extension with a locking area. The lever arm enables easier adjustment between the safety position and the cutting position. Furthermore, the lever arm can be used to bridge a path between the actuation area and the locking area.

[0028] The blade can be releasably positioned in a blade seat, which includes a positive locking mechanism, so that the blade can be released from the blade seat exclusively by translational movement in one direction or by pivoting movement, with the movement being lockable by a retaining element. This enables simple and safe assembly and disassembly.

[0029] The retaining element is formed by a spring wire, for example. This allows the blade to be easily locked. The spring wire requires little space and is inexpensive. The wire does not form undercuts or other deposits for particles, making it less susceptible to particle accumulation, which could impair the knife's reliability.

[0030] In the cutting position, the blade's longitudinal axis forms an obtuse angle with the bar's longitudinal axis. Therefore, the bar simply needs to be guided past the material to be cut, and the blade is already in the correct position for a cut. In other words, with an ergonomic bar grip, a cut can be easily made with a pulling or pushing motion.

[0031] For example, the housing is movable relative to the blade into a blade-changing position, wherein the housing is positioned such that the blade can be removed from the blade seat or a blade can be mounted in the blade seat. The blade-changing position represents a relative position between the blade and the housing in which the blade can be removed from the blade seat.

[0032] The return element comprises, for example, a spring with a first spring end and a second spring end. The spring is mounted in such a way that when the knife is moved into the blade-changing position, one spring end can move within a defined range. This feature prevents the housing or blade from being spring-loaded in the blade-changing position. During the blade change, the parts therefore do not have to be held in the blade-changing position against spring force, which could lead to injuries.

[0033] Embodiments of the invention are described by way of example in the following description of the figures, also with reference to the drawings. For the sake of clarity, identical or comparable parts, elements, or regions are designated by identical reference numerals, sometimes with the addition of lowercase letters, even where different embodiments are concerned.

[0034] They show: Fig. 1 a perspective view of the knife from the rear, Fig. 2 a side view of the knife from a first side, with the blade guard in the safety position, Fig. 3 a side view of the knife from a second side, Fig. 4 an enlarged view of section B in Fig. 2, Fig. 5 a longitudinal section of section B in Fig. 4, Fig. 6 based on Fig. 4 the knife in the cutting position, Fig. 7 a sectional view according to section line A - A in Fig. 6, Fig. 8 based on Fig. 4 the knife in the blade change position, Fig. 9 based on Fig. 4 a second side of the knife in the blade change position, Fig. 10 is an exploded view of the knife, with the rod not shown, Fig. 11 is a side view of a second embodiment of the knife, wherein the blade is movably mounted, Fig. 12 is a longitudinal sectional view of the cutting head of the knife in a safety position of the blade, with a plunger of the knife not shown, Fig. 13 is a longitudinal sectional view of the cutting head with the blade in a cutting position, a knife plunger not shown.

[0035] The knife 10 according to Fig. 1 is used for cutting materials in hazardous environments where the user should not stand near the cutting area. The danger may arise, for example, from large suspended loads in the material to be cut or, for example, from the material to be cut having to be cut above a filling opening, into which the user of the knife runs the risk of falling when approaching. With the knife according to the invention, the user can stand at a sufficient distance from the material to be cut during the cutting process. Furthermore, the knife 10 has features that prevent cuts from the blade.

[0036] The knife 10 comprises a rod 13 with a longitudinal central axis m, which comprises a first part 14 and a second part 15 telescopically extending relative to the first part 14. With a locking mechanism 16, which is biased into the locked position and can be unlocked by means of an actuation (not shown), the locked position can be released and another locked position can be set, in which the rod has a greater length relative to the length shown.

[0037] The rod 13 can bridge a distance between the material being cut and the user, so that the user is outside the danger zone of the material being cut during the cutting process. The rod has, for example, a length of 60 cm when the first part 14 and the second part 15 are nested, and a length of 120 cm when extended. A handle area 70 is located on the first part 14.

[0038] The rod has a first end portion 17 on the user side and a second end portion 18 on the blade side. A holding opening 68 is formed at the first end portion 17, which can be used, for example, for hanging the knife 10. A cutting head 40 is attached to the second end portion 18 in a rotationally fixed manner and immovably in directions x1 and x2 parallel to the rod 13.

[0039] The cutting head 40 comprises a housing 12 and a blade 11, which is Fig. 1 is not visible. The blade 11 and the housing 12 are fastened to a base element 60 of the cutting head 40. The housing 12 is movable relative to the blade 11. In the first exemplary embodiment, the housing 12 is pivotable relative to the base element 60, while the blade 11 is immovably connected to the base element 60. According to an alternative embodiment, however, the housing 12 could also be immovable relative to the base element 60 and the blade 11 could be movable, e.g. pivotable, relative to the base element 60. The base element 60 has a seat 22 in which the rod 13 is arranged and fastened.

[0040] In the representation according to Fig. 1, the knife 10 is in the safety position, in which the housing 12 covers the blade 11 so that a user cannot come into contact with the blade 11. By rotating about the pivot axis a1 in the direction u1, the housing 12 can be moved into a cutting position. A locking device 30 can be used to lock the respective position of the housing 12. In this example, the housing 12 is designed as a two-armed lever, with a lever arm 26 forming protective means and a receiving space 37 for the blade to prevent contact with the blade 11, and a lever arm 27 forming a handle 32.

[0041] From the locking position according to Fig. 1, the locking device 30 can be moved into a release position by means of an actuation 19 or by means of an actuation 24 of an actuation device 20, so that the housing 12 can be moved against the force of a Fig. 1, which is not shown in the drawing and which biases the housing 12 into the safety position, can be pivoted about a pivot axis a1 in the direction u1 into a cutting position in which the blade 11 emerges from an opening 63 in the housing 12. In the present example, the actuation 19 is actuated on an actuation surface 67 in the direction y1, or the actuation 24 is actuated on an actuation surface 66 in the direction y2, in each case against the spring force. The actuations 19 and 24 protrude with respect to the housing 12 in such a way that they can be actuated by striking a wall or an object. In the cutting position, the locking device 30 automatically moves into the locking position. In other words, the housing 12 remains in this locked position after the cutting position has been reached.

[0042] In Fig. 1 also shows a functional part 50 attached to the base element 60, which serves to stiffen the base element 60. Furthermore, further features are provided in the functional part 60, forming a plunger 25 and comprising part of the locking device 30, as will be described in more detail later. In the present example, the functional part is made of metal.

[0043] Fig. 2 shows the knife 10 according to Fig. 1 in the safety position in a side view. A section B is enlarged for a better overview in Fig. 4 shown.

[0044] Fig. 3 shows a side view of the knife 10, wherein one of the Fig. 2, the second side 85 of the knife 10, opposite the first side 21 shown in FIG. 2, is shown in the safety position. The blade 11 can be seen, with a blunt portion protruding from an opening 64 of the housing 12 opposite the opening 63. Furthermore, a retaining element 28 can be seen, which interchangeably locks the blade 11 to the base element 60.

[0045] In the enlarged view according to Fig. 4 shows a locking element 49 which interacts with a locking pin 58 to prevent movement of the housing 12 in the direction u2 into a blade-changing position. The locking element 49 comprises a locking surface 56 which bears against the locking pin 58. A spring element 57, which in this example is integrally formed on the locking element 49, but according to an alternative embodiment could also be a separate spring, loads the locking element 49 into engagement with the locking pin into a locked position in which the housing 12 cannot be moved in the direction u2. The locking element 49 can be moved against the spring force of the spring element 57 into a release position in which movement of the housing 12 in the direction u2 into the blade-changing position is released. In this example, the locking pin 58 is fastened to the functional part 50.

[0046] In Fig. 4 shows a bearing seat 33 for the holding element 28. In this case, an end region 69 of the holding element 28 is guided through an opening in the base element 60 and folded over, so that the holding element 28 can pivot in the opening.

[0047] A window 52 in the base element 60 allows the actuation 24 to pass through, so that - when the housing 12 is in the cutting position and the locking device 30 is in the locking position - an adjustment of the locking device 30 into the release position is possible with both actuations 19 and 24, which are arranged on opposite sides of the knife 10.

[0048] A projection 34 is formed on the base member 60, which assists in the secure grip of the knife 10 during the movement of the housing 12 from the safety position to the cutting position when the user pivots the handle 32 in the direction u1.

[0049] Fig. 5 shows a sectional view of the knife 10 according to Fig. 4 according to section line A-A. The receiving space 37 of the housing 12 for receiving the blade 11 in the safety position as well as the blade 11 can be seen, with access to its cutting edge 36 being protected by the housing 12. The functional part 50 has bores 59 which serve for attachment to the base element 60. A tongue 53 cut out of the functional part 50 and bent over extends through a recess in the base element 60 and projects into a blade seat 23, where it engages under an area of ​​the blade 11 and can absorb forces from the blade 11. The tongue 53 is designed to improve the connection between the functional part 50 and the base element 60 and to increase stability. In particular, forces acting on the functional part 50 in directions z1 and z2 can be transmitted to the base element 60 over a large area by means of the tongue 53.

[0050] A locking recess 46 is part of the locking device 30. In the locking position, an extension of the actuation 19 engages in the locking recess 46 when the knife 10 is in the safety position and thus prevents a pivoting movement of the housing 12 in the direction u1. The extension 73 of the actuation 19 (in Fig. 5) then interacts with an edge 71a of the locking recess 46. A ramp 47 sloping from an outer surface 72 of the functional part 50 in the direction y1 is formed on the edge 71b, so that the extension of the actuation 19 can move out of the locking recess 46 via the ramp 47 when the locking element 49 moves into the release position. In the locked position, the locking element 49 prevents movement of the housing 12 in the direction u2 when the housing 12 is in the safety position.

[0051] In Fig. 5 shows that a central axis m2 of the blade 11 forms an angle α to the central axis m1 of the rod 13. This allows the cutting process to be carried out in an ergonomically advantageous manner.

[0052] According to Fig. 6 the knife is in the cutting position, whereby the housing 12 is moved from the safety position in direction u1 around the pivot axis a1 into the position according to Fig. 6 has been pivoted. The blade 11 protrudes with a portion from the opening 63 of the housing 12, so that an area of ​​the cutting edge 36 is freely accessible and a cutting operation can be performed. Due to the handle 32, which is arranged on the lever arm 27 away from the exposed cutting edge, the user can perform the pivoting operation from the safety position to the cutting position without risk of injury. The locking element 49 has no function in the cutting position.

[0053] In the cutting position, the locking device 30 automatically moves into the locking position so that the housing 12 is in the Fig. 6. In the locking position of the locking device 30, the extension 73 cooperates with a stop surface 74 of the functional part 50, which forms part of a reveal of the window 52.

[0054] With the blade 11 mounted in this embodiment, a pulling cut in the direction x1 can be performed in the cutting position. Alternatively, a pushing cut in the direction x2 could also be performed with a blade of a different shape. By striking an object, the actuation 19 can be moved in the direction y1 or, alternatively, the actuation 24 can be moved in the direction y2, whereupon the locking device 30 moves into the release position and the Fig. The return element 43 shown in Figure 6 pivots the housing 12 in the direction u2 into the safety position. In the safety position, the locking device 30 automatically moves into the locking position, with the extension 73 re-engaging in the locking recess 46.

[0055] In Fig. 7 shows a sectional view of section A - A, with the cutting line in Fig. 6. The knife 10 is in the cutting position. The extension 73 of the actuation 19 engages with the window 52. The stop surface 74 of the reveal of the window 52, ​​formed by the functional element 50, interacts with the extension 73 and prevents a pivoting movement of the housing 12 in the direction u2. The actuation 19 can be pivoted in the directions p1 and p2 by means of a pivot axis a2 mounted in the housing 12 and is loaded in the direction p2 by a spring.

[0056] According to Fig. 7, the actuation 19 is designed as a two-armed lever, with an actuation projection 75 on a first lever arm and the extension 73 on a second lever arm. A force on the actuation projection 75 in the direction y1 therefore pivots the actuation 19 against the spring force of the spring 61 (not shown). Fig. 7) in the direction p1 and moves the extension 73 out of engagement with the window 52. The housing 12 can then be pushed by the spring 43 (also in Fig. 7 not shown), which loads the housing 12 into the safety position. Alternatively, by moving the actuator 24 in direction y2, the arm 65 is loaded against the extension 73, whereby the actuator 19 is also moved against the spring force of the Fig. 7, the spring 61 pivots in direction p1 from the locking position into the release position. After the load is released, the spring 61 automatically pivots the actuator 19 in direction p2 into the locking position.

[0057] In Fig. 7 shows the opening 63 at the top of the housing 12, from which the blade 11 emerges in the cutting position. Fig. 7 that the actuating area 48 of the holding element 28 rests on a guide surface 62 and engages behind an undercut 76 of the base element 60 under pretension in the direction z1 and is locked in this way.

[0058] From the security position according to Fig. 4, the housing 12 can be moved into a blade changing position by pivoting the locking element 49 against the restoring force of the spring element 57 in the direction o1 out of engagement with the locking pin 58. The spring element 49 loads the locking element 49 in the direction o2 into engagement with the locking pin 58. The housing 12 can then be moved from the position according to Fig. 4 in direction u2 into the position according to Fig. 8. The extension 73 slides over the ramp 47 past the edge 71b of the locking recess 46. The blade 11 is thereby moved through the lower opening 64 of the housing 12. In the blade change position, the blade 11 can be removed from the blade seat 23.

[0059] The spring 43 (see Fig. 8) rests in the safety position against a stop surface 44 of a stop structure, which forms a movement space 45 for one leg of the spring 43. During the movement from the safety position to the blade change position, one spring leg has the possibility of leaving contact with the stop surface 44 and moving in the direction u2, like the housing 12. The housing 12 is thus not spring-loaded in the blade change position.

[0060] Fig. 9 shows the in relation to Fig. 8 opposite second side 85 of the knife, with the knife 10 being in the blade change position. The blade 23 is arranged in the blade seat 23 and the positive locking pin 29 extends through a recess 39 in the blade 11. The nose 31 engages in a recess 41 of the blade 11. The holding element 28, which serves to secure the blade 11 in the blade seat 23, can be seen. In this example, it is formed from a spring wire. The end region 69 of the holding element 28 extends through the bearing seat 33 and is pivotally mounted therein. A holding region 35 of the holding element 28 engages over an outer surface 77 of the blade 11 and prevents movement of the blade 11 in the direction y1. The actuating region 48, which simultaneously forms part of a locking mechanism for the holding element, is locked to the base element 60. In Fig. 9 shows a locking connection 42 with which the rod 13 is connected to the base element 60.

[0061] A movement of the actuating area 48 in direction z2 (according to Fig. 7) and a subsequent movement in the direction y1 out of the undercut 76 and out of engagement with the guide surface 62, allows the holding element 28 to pivot in the direction q1 until it no longer engages the outer surface 77. The blade 11 can then be removed from the blade seat 23 in the direction y1, disengaged from the positive locking pin 29 and the nose 31, and replaced with a new blade 11. After pivoting the holding element 28 in the direction q2 and subsequently locking it at the undercut 76, if the housing 12 is subsequently pivoted in the direction u1, the locking element 49 automatically engages the locking pin 58 due to the restoring force of the spring element 57.

[0062] Fig. Figure 10 shows an exploded view of the knife 10, with the blade 11 and the rod 13 not shown. The housing 12 is formed from the housing parts 12a and 12b. Both housing parts 12a and 12b can be connected to one another by means of the shaft 54 ​​formed on the housing part 12a and the hook element 55 formed on the housing part 12b, which is designed to engage around the shaft 54.

[0063] Furthermore, parts 12a and 12b are connected by means of an axle pin 79, which passes through a recess 81 in housing part 12a, a pin 78 formed by base element 60, and a recess 82 in housing part 12b, and is secured behind it against removal by a retaining ring 83. The seat 51 for functional element 50 can be seen on base element 60. Pin 78, which forms pivot axis a1, is also provided as a bearing for spring 43, which biases housing 12 in direction u2 into the safety position. Spring 43, in this example a torsion spring, although other springs are also possible, is mounted coaxially on pin 78.

[0064] The actuator 24 comprises the arm 65 and a locking element 84 with which the actuator 24 can be locked to the base element 60. The actuator 24 is elastically deformable, so that a free region with the arm 65 can be moved in direction y2 against the restoring force in order to move the locking device 30 into the release position. The screws 38a and 38b are provided for fastening the functional part 50 to the base element 60, with a portion of the screw 38a simultaneously forming the locking pin 58.

[0065] In Fig. 10 shows the spring 61, which loads the actuation 19 in the pivoting direction p2.

[0066] A second embodiment is shown in the Fig. 11 and Fig. 12. The knife 110 according to the second example differs from the knife 10 of the first embodiment only in that the blade 11 is movable relative to the base element 60 and thus also relative to the rod 13, and the housing 12 is immovable relative to the base element 60.

[0067] The blade 11 is between a Fig. 11 and Fig. 12 shown safety position and one in Fig. 13. In the safety position, the blade 11 is covered by the housing 12 in such a way that access to the cutting edge 36 of the blade 11 is not possible. In the cutting position, the blade 11 protrudes from the housing 12 in such a way that a cutting operation is possible.

[0068] The blade 11 is mounted on a blade carrier 86, which is pivotable about a pivot axis a1' and is biased into the safety position by a spring (not shown). The blade carrier 86 is designed as a two-armed lever, with a first lever arm being provided with the cutting edge 36 and a second lever arm forming a handle 32'.

[0069] The actuator 19 is designed according to the first embodiment and is mounted on the housing 12 according to the first example (see Fig. 7). The extension 73 of the actuation 19 engages in the safety position according to Fig. 12 into a safety recess 88 of the blade carrier 86 and blocks movement into the cutting position. By means of the handle 32', the blade carrier 86 can be pivoted from the safety position in the direction u2 and the blade 11 can be moved into the cutting position according to Fig. 13. In the cutting position, the extension 73 engages in a cutting recess 87 and prevents movement into the safety position.

[0070] The actuation 19 is designed in the same way as in the first embodiment as a two-armed lever, wherein one lever arm is provided with the actuation projection 75 and a second lever arm with the extension 73. By activating the actuation 19 at the actuation projection 75 or by means of the arm 65 of the actuation 24 through the window 52, ​​the extension 73 can be released from the engagement with the cutting recess 87, so that the spring moves the blade carrier 86 with the blade 11 into the safety position according to Fig. 12. The extension 73 then engages again in the safety recess 88 and holds the blade 11 in the safety position. The cutting head 40 can then be moved toward the user in a safe state without the user being injured by the cutting edge 36.

Claims

[1] Knife (10) with a housing (12) and with a blade (11), wherein at least a part of the housing (12) is movable relative to the blade (11) between a safety position, in which at least a part of the blade (11) is protected inaccessibly by the housing (12), and a cutting position, in which at least a portion of a cutting edge (36) of the blade (11) protrudes from the housing (12), wherein a return element (43) loads the housing (12) or the blade (11) into the safety position, wherein a handle portion of the knife (10) is formed on a first end portion (17) of a rod (13) and wherein the blade (11) is arranged on a second end portion (18) of the rod (13), wherein by means of the rod (13) the user can guide the knife (10) outside a danger zone in which the material to be cut is located, characterized bythat the knife (10) can be locked in at least one of the safety position, cutting position and blade change position by means of a locking device (30) which is movable between a locking position and a release position, wherein the housing (12) has at least one actuation (19, 24) by means of which the locking device (30) can be adjusted between the locking position and the release position. [2] Knife according to claim 1, characterized by that the blade (11) is fixedly arranged relative to a base element (60) and the housing (12) is movable relative to the blade (11) or that the housing (12) is fixedly arranged relative to the base element (60) and the blade (11) is movable relative to the housing (12). [3] Knife according to claim 1 or 2, characterized bythat the actuation (19, 24) is arranged such that it can be actuated by a compressive force which is directed in the lateral direction (y1, y2) towards a longitudinal axis (m) of the tool (22). [4] Knife according to one of the preceding claims, characterized by that a first actuation (19) is arranged on a first side of the knife (10) and a second actuation (24) is arranged on a second side of the knife (10). [5] Knife according to one of the preceding claims, characterized by in that a two-armed lever forms a pivot joint with a base element (60) of the knife (10), wherein a handle (32) for adjusting the lever is assigned to a first lever arm (27) and the housing (12) or the blade (11) is assigned to a second lever arm (26). [6] Knife according to one of the preceding claims, characterized bythat the rod (13) is telescopically designed with a first part (14) and a second part (15) movable relative to the first part (14). [7] Knife according to claim 6, characterized by that the second part (15) can be locked relative to the first part (14) in different relative positions by means of a locking device (16). [8] Knife according to one of the preceding claims, characterized by that a functional part (50) for stiffening is connected to the base element (60). [9] Knife according to claim 8, characterized by that parts of the locking device (30) are assigned to the functional part (50). [10] Knife according to claim 8 or 9, characterized by that the functional part (50) is made of metal or of a fiber-reinforced plastic. [11] Knife according to one of claims 8 to 10, characterized bythat the functional part (50) forms a plunger (25) which forms a blunt element for positioning the material to be cut. [12] Knife according to one of claims 8 to 11, characterized by that the functional part (50) can be received in a seat (51) in such a form-fitting manner that it is fixed with respect to the base element (60) at least in an xz plane. [13] Knife according to one of the preceding claims, characterized by that at least one actuation (19) is designed as a two-armed lever, wherein a first lever arm comprises an actuation projection (75) and a second lever arm comprises an extension (73) with a locking region. [14] Knife according to one of the preceding claims, characterized byin that the blade (11) can be releasably positioned in a seat (23) which comprises form-locking means, so that the blade (11) can be released from the seat (23) exclusively by translatory movement in one direction (y1) or by pivoting movement, wherein the movement can be locked by means of a holding element (28). [15] Knife according to one of the preceding claims, characterized by that the holding element (28) is formed by a spring wire. [16] Knife according to one of the preceding claims, characterized by that the blade (11) in the cutting position forms an obtuse angle with a longitudinal axis (m) of the rod (13). [17] Knife according to one of the preceding claims, characterized bythat the housing (12) is movable relative to the blade (11) into a blade changing position, wherein the housing (12) is positioned such that the blade (11) can be removed from the blade seat (23) or a blade (11) can be mounted in the blade seat (23). [18] Knife according to one of the preceding claims, characterized by that the return element (43) comprises a spring with a first spring end and a second spring end and that when the knife (10) moves into the blade changing position, one spring end is mounted in such a way that it can move within a defined range.

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