Kitchen knife

Abstract

The invention relates to a knife comprising a blade (1) and a handle (2) having a joining portion and a main gripping portion (200), wherein the main gripping portion (200) of the handle (2) has a shape having a longitudinal widening extending in the longitudinal plane and defined by a longitudinal widening angle α formed between a lower edge (222) and an upper edge (221), the longitudinal widening angle α having a set value of between 3° and 8°, and wherein the joining portion is such that the ratio between the lower joining arrow (FiJ) and the joining height (HJ) decreases in the longitudinal direction (L) starting from the blade (1) and going towards the main gripping portion (200).

Description

FIELD OF INVENTION

[0001] The present invention relates to the field of knives, and more specifically to kitchen knives. STATE OF THE ART

[0002] Knives, and kitchen knives in particular, can be held and used for extended periods. Their design is therefore paramount to providing the user with the best possible experience, as well as a certain level of control and dexterity in their movements.

[0003] One of the important factors in this user experience lies in the design of the knife handle, also called the grip.

[0004] There are many shapes and sizes of kitchen knife handles which vary depending on the use and sometimes the size of the blade.

[0005] There are also different arrangements of materials that make up kitchen knife handles, whether they are one-piece (i.e. the handle is made of the same material as the blade) or multi-material.

[0006] Regarding the ergonomics of these handles, knives come in various shapes and are made from specific materials to optimize hand movements and user comfort when cooking. Document WO 2016 / 144428 A1 provides an example of a knife with a specific handle design.

[0007] However, it is very difficult to find a perfect balance between all design criteria and existing models will often favor one aspect over another, which will ultimately harm this sought-after balance. DESCRIPTION OF THE INVENTION

[0008] One aim of the present invention is to provide a knife which is not only comfortable for a user to grip but also safe, in particular without impromptu hand movements when using the knife.

[0009] Another objective of the present invention is to provide a knife that does not require excessive pressure on the handle during use, thus avoiding muscle fatigue.

[0010] One aim of the present invention is indeed to provide a knife which facilitates the usual movements assigned by the user, providing the user with high cutting precision.

[0011] Another objective of the present invention is to provide a knife with a specific handle geometry that optimizes grip for the user. A good grip will have the advantage of preventing premature wear of the blade due to improper use.

[0012] In particular, an object of the present invention is to provide a knife with a handle whose shape naturally adapts to the shape of the hand, regardless of the size of the user's hand, and regardless of which hand (right or left) is used.

[0013] Another objective of the present invention is to provide a knife for which the grip is optimized, and where the effort required to hold and maintain the knife properly is limited.

[0014] Another objective of the present invention is to provide a knife where user fatigue is reduced and where their efforts are concentrated on cutting and not on gripping the knife.

[0015] Another objective of the present invention is to provide a one-piece knife, that is to say, whose handle is formed from the same material as the blade, in particular a metallic material, which does not slip in the user's hand when the latter uses it.

[0016] Another objective of the present invention is to provide a knife whose design principles are applicable to all knife sizes.

[0017] To this end, a knife is proposed, comprising a blade having a back of the blade and a cutting edge opposite the back of the blade, the blade extending in a longitudinal plane in a longitudinal direction between a distal end and a proximal end, a handle extending from the proximal end of the blade in the longitudinal direction, the handle having a connecting portion attached to the proximal end of the blade, and a main gripping portion extending from the connecting portion, the main gripping portion having an upper edge extending substantially in line with the back of the blade in the longitudinal plane, a lower edge extending in the longitudinal plane and opposite the upper edge, two flanks respectively on either side of the longitudinal plane and extending between the upper edge and the lower edge,each side being formed of an upper side portion connected to the upper slice and a lower side portion connected to the lower slice, the upper side portion being connected to the lower side portion by means of a gripping edge projecting transversely and constituting the outermost area of ​​the side transversely with respect to the longitudinal plane, in which the main gripping portion of the handle has a shape having a longitudinal flare extending from the junction portion in the longitudinal plane and defined by a longitudinal flare angle α formed between the lower slice and the upper slice, the longitudinal flare angle α having a fixed value between 3° and 8°,and wherein the main gripping portion of the handle has a shape exhibiting a transverse flare extending from the junction portion and defined by a transverse flare angle β formed between the two gripping edges of the flanks of the main gripping portion of the handle, the transverse flare angle β having a fixed value between 1° and 5°.

[0018] We also offer a knife, including a blade having a back of the blade and a cutting edge opposite the back of the blade, the blade extending in a longitudinal plane in a longitudinal direction between a distal end and a proximal end, a handle extending from the proximal end of the blade in the longitudinal direction, the handle having a connecting portion attached to the proximal end of the blade, and a main gripping portion extending from the connecting portion, the main gripping portion having an upper edge extending substantially in line with the back of the blade in the longitudinal plane, a lower edge extending in the longitudinal plane and opposite the upper edge, two flanks respectively on either side of the longitudinal plane and extending between the upper edge and the lower edge,each side being formed of an upper side portion connected to the upper edge and a lower side portion connected to the lower edge, the upper side portion being connected to the lower side portion by means of a gripping edge projecting transversely and constituting the outermost area of ​​the side transversely relative to the longitudinal plane, in which the main gripping portion of the handle has a shape having a longitudinal flare extending from the joining portion in the longitudinal plane and defined by a longitudinal flare angle α formed between the lower edge and the upper edge, the longitudinal flare angle α having a fixed value between 3° and 8°, and in which the joining portion includes an upper joining edge extending substantially in the continuation of the back of the blade in the longitudinal plane,the upper junction slice connecting the back of the blade to the upper slice of the main gripping portion, a lower junction slice extending in the longitudinal plane and opposite the upper junction slice, the lower junction slice connecting the proximal end of the blade to the lower slice of the main gripping portion, two junction flanks respectively on either side of the longitudinal plane and extending between the upper junction slice and the lower junction slice, each junction flank being formed of a portion of the upper junction flank connected to the upper junction slice and a portion of the lower junction flank connected to the lower junction slice,the upper junction flank portion being connected to the lower junction flank portion via a transversely projecting junction gripping edge constituting the outermost area of ​​the junction flank transversely relative to the longitudinal plane, wherein the distance in the longitudinal plane between the lower junction slice and the upper junction slice at a given position along the longitudinal direction defines a junction height, and the distance in the longitudinal plane between the lower junction slice and the projection of the junction gripping edge in the longitudinal plane at a given position along the longitudinal direction defines a lower junction deflection, the ratio between the lower junction deflection and the junction height being decreasing along the longitudinal direction from the blade towards the main gripping portion.

[0019] The main gripping portion of the handle of such a knife may have a shape having a transverse flare extending from the junction portion and defined by a transverse flare angle β formed between the two gripping edges of the sides of the main gripping portion of the handle, the transverse flare angle β having a fixed value between 1° and 5°.

[0020] Some preferred but not exhaustive aspects of these knives, taken alone or in combination, are as follows: The longitudinal flare angle α has a fixed value between 3.5° and 5.5°. The transverse flare angle β has a fixed value between 1.5° and 4°, preferably between 2° and 3°. The upper and lower edges each extend along a straight line, and each gripping edge extends along a straight line. The handle height of the main gripping portion at the point where it joins the connecting portion has a value between 17 mm and 22 mm, preferably between 18 mm and 21 mm.preferably still on the order of 20 mm. Each joint gripping edge is curved and includes an inflection point where a change in concavity is present. The joint portion of the handle has a shape with a longitudinal flare extending from the blade in the longitudinal plane and defined by a longitudinal joint flare angle αJ formed between the lower and upper joint edges, the longitudinal joint flare angle αJ having a fixed value between 15° and 20°. The joint portion of the handle has a shape with a transverse flare extending from the blade and defined by a transverse joint flare angle βJ formed between the two joint gripping edges of the joint portion of the handle.The transverse flare angle of the joint βJ has a fixed value between 15° and 20°. The upper joint edge extends along a straight line, and the lower joint edge extends along a curve with an inflection point at which a change in concavity is present. The joint height of the joint portion has a minimum value between 14 mm and 18 mm, preferably between 15 mm and 16 mm. The handle further comprises an end portion connected to and extending from the main gripping portion. The end portion comprises: an upper end edge extending substantially in line with the back of the blade in the longitudinal plane, the upper end edge being connected to the upper edge of the main gripping portion; and a lower end edge extending in the longitudinal plane and opposite the upper end edge.the lower end slice being connected to the lower slice of the main gripping portion, ∘ two end flanks respectively on either side of the longitudinal plane and extending between the upper end slice and the lower end slice, ∘ each end flank being formed of an upper end flank portion connected to the upper end slice and a lower end flank portion connected to the lower end slice, the upper end flank portion being connected to the lower end flank portion by means of an end gripping edge projecting transversely and constituting the area of ​​the end flank that is furthest transversely from the longitudinal plane,• wherein the distance in the longitudinal plane between the lower end slice and the upper end slice at a given position along the longitudinal direction defines an end height, and the distance in the longitudinal plane between the lower end slice and the projection of the end gripping edge in the longitudinal plane at a given position along the longitudinal direction defines a lower end deflection, the ratio of the lower end deflection to the end height decreasing along the longitudinal direction from a free end of the end portion towards the main gripping portion. Each end gripping edge is curved and has no inflection point. The upper end slice extends along a straight line and the lower end slice extends along a curve without an inflection point. The knife is a single piece. DESCRIPTION OF THE FIGURES

[0021] Other features and advantages of the invention will become apparent from the following description, which is purely illustrative and not limiting and should be read in conjunction with the accompanying drawings, on which: There figure 1 is a perspective view of a knife according to a first embodiment; The figure 2 is a side view of the knife of the figure 1 ; There figure 3 is a top view of the knife of the figure 1 ; There figure 4 is a view from below of the knife of the figure 1 ; There figure 5 is the side view of the figure 2 on which the longitudinal flare angle α has been represented; The figure 6 is the side view of the figure 2 on which the longitudinal flare angle of the junction αJ has been represented; The figure 7 is the top view of the figure 4 on which the transverse flare angle β has been represented; The figure 8is the top view of the figure 4 on which the transverse flare angle of the junction βJ has been represented; The figure 9 is a cross-sectional view of the junction portion of the knife handle along the cutting line AA of the figure 3 ; There Figure 10 is a cross-sectional view of the main gripping portion of the knife handle along the BB cutting line of the figure 3 ; There figure 11 is a cross-sectional view of the end portion of the knife handle along the CC cutting line of the figure 3 ; There figure 12 is a perspective view of a knife according to a second embodiment; The figure 13 is a side view of the knife of the figure 12 ; There figure 14 is a top view of the knife of the figure 12 ; There figure 15 is a view from below of the knife of the figure 12 ; There figure 16is a side view of the knife handle according to the second embodiment, illustrating the groove angles; The figure 17 is a perspective view of a knife according to a third embodiment; The figure 18 is a side view of the knife of the figure 17 ; There figure 19 is a top view of the knife of the figure 17 ; There Figure 20 is a view from below of the knife of the figure 17 ; There figure 21 is a side view of the knife handle according to the third embodiment, illustrating the groove angles. DETAILED DESCRIPTION OF THE INVENTION

[0022] A knife consists of a blade 1 from which extends a handle 2, also commonly called a grip.

[0023] The blade 1 always has the following geometry. It has a blade back 11 and a cutting edge 12 opposite the blade back 11, the cutting edge 12 forming the side from which a user can cut. The blade 1 extends in a longitudinal plane along a longitudinal direction L between a distal end 13 and a proximal end 14. The distal end 13 constitutes the free end of the blade, generally pointed or rounded. The proximal end 14 is coupled to the handle 2, as will be seen later.

[0024] Blade 1 is generally a single piece formed from a single material, for example metallic.

[0025] Blade 1 can take different shapes and sizes depending on the intended use.

[0026] As stated above, the handle 2 extends from the proximal end 14 of the blade 1 in the longitudinal direction L, the handle 2 being connected to the proximal end 14 of the blade 1.

[0027] For kitchen knives, the handle 2 is permanently and securely attached to the blade 1. The handle may, for example, be welded to the blade, particularly in the case of one-piece knives. A one-piece knife is defined as a knife whose handle is formed from a material similar to that of the blade, especially a metallic material. Preferably, a one-piece knife has a handle and a blade formed from the same material.

[0028] Preferably, the proposed knife is made from a single piece of metal. It could, for example, be made from a metallic material, in particular a steel alloy, such as stainless steel.

[0029] Overall, the handle 2 comprises an upper handle slice 21 extending substantially in line with the back of the blade 11 in the longitudinal plane, and a lower handle slice 22 extending in the longitudinal plane and opposite the upper handle slice 21.

[0030] The handle 2 further comprises two handle flanks 23 respectively on either side of the longitudinal plane and extending between the upper handle slice 21 and the lower handle slice 22. Each handle flank 23 thus makes it possible to connect the upper handle slice 21 to the lower handle slice 22.

[0031] These handle sides 23 are preferably convex transversely outwards relative to the longitudinal plane. It is these handle sides 23 that will notably define the volume of the handle 2.

[0032] Preferably, each handle side 23 is formed of a portion of upper handle side 231 connected to the upper handle slice 21 and a portion of lower handle side 232 connected to the lower handle slice 22.

[0033] Preferably, the upper handle flank portion 231 is connected to the lower handle flank portion 232 by means of a handle gripping edge 233 projecting transversely and forming the outermost area of ​​the handle flank transversely relative to the longitudinal plane. Such a handle gripping edge 233 is formed in the lower part of the handle 2, that is, on the side of the lower handle edge 22. More precisely, the handle gripping edge 233 is closer to the lower handle edge 22 than to the upper handle edge 21.

[0034] This 233 handle grip ridge is designed to fit snugly along the user's interphalangeal line, ensuring a perfect grip on the knife handle. This results in a more comfortable and secure grip, as the 233 handle grip ridge prevents the knife from rotating around its longitudinal axis in the hand.

[0035] The handle is preferably symmetrical with respect to the longitudinal plane. In this case, the structure and geometry of the sides are identical, with the sides also being symmetrical with respect to the longitudinal plane. Such a configuration is particularly advantageous so that the knife can be used equally well by a right-handed or left-handed person, with the same benefits.

[0036] Preferably, handle 2 is formed of several portions depending on the longitudinal position considered, these portions having shapes and functions that may differ.

[0037] The handle 2 may first have a junction portion 100 connected to the proximal end 14 of the blade 1. Besides linking the blade 1 to the rest of the handle 2, this junction portion 100 may also be provided to facilitate fine manipulations of the knife, for example when the knife needs to be tilted along an axis of translation orthogonal to the longitudinal plane.

[0038] The handle 2 also has a main gripping portion 200 extending from the joint portion 100, allowing the user to fully grip the knife with their entire hand. This main gripping portion 200 corresponds to the largest portion of the handle in the longitudinal direction.

[0039] The main gripping portion 200 can, for example, represent at least 2 / 3 of the handle length, or even at least 3 / 4 of the handle length, for example 80% of the length.

[0040] Preferably but not necessarily, the handle 2 further comprises an end portion 300 connected to and extending from the main gripping portion 200. If present, this end portion 300 thus constitutes the free end of the handle, opposite the tip of the blade. Main gripping portion

[0041] Just like the handle 2 in general, the main gripping portion 200 has an upper edge 221 (also called the upper gripping edge) extending substantially in line with the back of the blade 11 in the longitudinal plane, a lower edge 222 (also called the lower gripping edge) extending in the longitudinal plane and opposite the upper edge 221, and two flanks 223 (also called gripping flanks) respectively on either side of the longitudinal plane and extending between the upper edge 221 and the lower edge 222.

[0042] According to a preferred but not mandatory design, each side is formed of an upper side portion 2231 connected to the upper slice 221 and a lower side portion 2232 connected to the lower slice 222.

[0043] Preferably, the upper flank portion 2231 is connected to the lower flank portion 2232 by means of a gripping edge 2233 projecting transversely and constituting the outermost area of ​​the flank transversely with respect to the longitudinal plane, as can be clearly seen in the figure 11 for example, which illustrates a cross-section of the handle in the main gripping portion.

[0044] The 2233 gripping edge is preferably positioned specifically to fit into the user's interphalangeal line so that their hand fits perfectly into the knife handle.

[0045] In this regard and with reference to the Figure 10 , the handle height H is defined as corresponding to the distance in the longitudinal plane between the lower slice 222 and the upper slice 221 at a given position along the longitudinal direction L.

[0046] Still referring to the Figure 10 The lower arrow Fi is defined as the distance in the longitudinal plane between the lower slice 222 and the projection of the gripping edge 2233 in the longitudinal plane at a given position along the longitudinal direction L. The upper arrow Fs corresponds to the distance in the longitudinal plane between the upper slice 221 and the projection of the gripping edge 2233 in the longitudinal plane at a given position along the longitudinal direction L.

[0047] According to an advantageous and preferred embodiment, the main gripping portion 200 is specifically formed so that the positioning of the gripping edge 2233 is such that the ratio between the lower deflection and the handle height is substantially constant at every point of the main gripping portion of the handle along the longitudinal direction L. By substantially constant, it is understood that the ratio is constant within manufacturing and measurement tolerances. Thus, the percentage value is constant to within ±2%, or even ±1%.

[0048] Preferably, in the main gripping portion 200, the ratio between the lower deflection and the grip height has a fixed value between 13% and 20%. Preferably, this value is between 16% and 18%, for example a value of around 17%.

[0049] The specific positioning of such a gripping edge 2233 within the main gripping portion 200 of the handle 2 also facilitates food cutting by the user in a direction substantially perpendicular to the longitudinal direction L of the blade. Indeed, such a gripping edge 2233 creates a protruding line that opposes the user's hand when they make an up-and-down motion with the knife. Not only is the force applied by the hand to the handle effectively transmitted to the blade, but this force transmission is made easier thanks to the gripping edge 2233.

[0050] Thus, the user can reduce the pressure exerted on the handle so that the knife still fits well in the hand.

[0051] In addition, the handling of the knife is safe since this gripping edge 2233 prevents the knife from rotating in the hand around its longitudinal axis.

[0052] Preferably, the gripping edge 2233 is sufficiently prominent to fit well into the interphalangeal crease when a user takes the knife in hand. In this respect, the gripping edge angle θ, which is the internal angle formed between the upper flank portion 2231 and the lower flank portion 2232, is preferably less than 160°, preferably between 120° and 150°, and preferably between 135° and 145°.

[0053] The gripping edge 2233 is preferably straight. Advantageously, the lower slice 222 can extend along a straight line, just as the upper slice 221 extends along a straight line.

[0054] The upper flank portion 2231 and the lower flank portion 2232 may be curved with their concavity facing inwards towards the handle. Preferably, neither the upper flank portion 2231 nor the lower flank portion 2232 has a point of inflection. This geometry provides a handle 2 with a soft and comfortable grip, the gripping edge 2233 stabilizing the handle 2 in the user's hand.

[0055] According to a preferred but not mandatory additional design, taken alone or in combination with the other proposed designs, the main gripping portion 200 of the handle 2 has a shape exhibiting a longitudinal flare extending from the joining portion 100 in the longitudinal plane and defined by a longitudinal flare angle α formed between the lower slice 2232 and the upper slice 2231, as illustrated in the figure 7 .

[0056] Preferably, the longitudinal flare angle α has a fixed value between 3° and 8°. Even more preferably, the longitudinal flare angle α has a fixed value between 3.5° and 5.5°. For example, the longitudinal flare angle α has a value of approximately 4.5°.

[0057] This longitudinal flare of the handle 2 is particularly advantageous as it helps to keep the knife securely in the hand during use. In particular, when the user cuts food with a translational movement along the longitudinal direction L, the longitudinal flare prevents the hand from slipping relative to the handle, especially during a backward translation, i.e., from the blade towards the handle.

[0058] Furthermore, the specific longitudinal flare offered ensures a comfortable grip for the user. The user's hand feel on the handle is not disrupted by an aggressive geometry or any additional handle features designed to aid hand retention.

[0059] Finally, this longitudinal flare allows all fingers to be used when gripping the knife, particularly those furthest from the blade (ring and little fingers), especially when the upper edge of the main gripping portion is aligned with the spine of the blade. Furthermore, the reduced force exerted by the outermost fingers is compensated for by the greater handle height (due to the longitudinal flare angle α), thus ensuring a consistent grip regardless of the finger used.

[0060] According to a preferred but not mandatory additional design, taken alone or in combination with the other proposed designs, the main gripping portion 200 of the handle 2 has a shape having a transverse flare extending from the joining portion 100 and defined by a transverse flare angle β formed between the two gripping edges 2233 of the flanks of the main gripping portion 200 of the handle 2.

[0061] Preferably, the transverse flare angle β has a fixed value between 1° and 5°. Even more preferably, the transverse flare angle β has a fixed value between 1.5° and 4°, preferably a fixed value between 2° and 3°.

[0062] This transverse flare of the handle 2 is particularly advantageous as it helps to keep the knife securely in the hand during use. Specifically, when the user cuts food with a translational movement along the longitudinal direction L, the transverse flare prevents the hand from slipping relative to the handle, particularly during a backward translation, i.e., from the blade towards the handle.

[0063] Furthermore, the specific transverse flare offered ensures a comfortable grip for the user. The user's hand feel on handle 2 is not disrupted by an aggressive geometry or any additional handle features designed to aid hand retention.

[0064] As with longitudinal flare, such transverse flare allows all fingers to be engaged when the user grips the knife, particularly those fingers furthest from the blade (ring and little fingers). Furthermore, the reduced force exerted by the outermost fingers is compensated for by the greater handle height (due to the transverse flare angle β), thus ensuring a uniform grip regardless of the finger used.

[0065] In a specific example, the transverse flare angle β differs from the longitudinal flare angle α, where applicable. This creates a kind of asymmetry in the handle geometry, which enhances the user's grip and strengthens the hand's locking function during translational movement of the knife along the longitudinal direction L. Furthermore, this asymmetry prevents the knife from rotating in the hand around its longitudinal axis.

[0066] The handle height of the main gripping portion 200 at the connection with the joining portion 100 preferably has a value between 17 mm and 22 mm, preferably a value between 18 mm and 21 mm, preferably still in the order of 20 mm. Junction portion

[0067] Just like the handle 2 in general, the joining portion 100 includes an upper joining slice 121 extending substantially in line with the back of the blade 11 in the longitudinal plane, the upper joining slice 121 connecting the back of the blade 11 to the upper slice 221 of the main gripping portion 200.

[0068] The junction portion 100 further includes a lower junction slice 122 extending in the longitudinal plane and opposite the upper junction slice 121, the lower junction slice 122 connecting the proximal end of the blade to the lower slice 222 of the main grasping portion 200.

[0069] Furthermore, the junction portion 100 comprises two junction flanks 123 respectively on either side of the longitudinal plane and extending between the upper junction slice 121 and the lower junction slice 122.

[0070] The junction portion 100 is commonly referred to as a mitre in the dedicated language.

[0071] According to a preferred but not mandatory design, each junction flank 123 is formed of a portion of upper junction flank 1231 connected to the upper junction slice 121 and a portion of lower junction flank 1232 connected to the lower junction slice 122.

[0072] Preferably, the upper junction flank portion 1231 is connected to the lower junction flank portion 1232 via a junction gripping edge 1233 projecting transversely and constituting the outermost area of ​​the junction flank transversely relative to the longitudinal plane.

[0073] The 1233 junction gripping edge is preferably positioned specifically to fit into the user's interphalangeal line, more precisely into the interphalangeal line of the thumb and / or index finger.

[0074] In this regard and with reference to the figure 9 , the junction height HJ is defined as corresponding to the distance in the longitudinal plane between the lower junction slice 122 and the upper junction slice 121 at a given position along the longitudinal direction L.

[0075] Still referring to the figure 9The lower junction arrow FiJ is defined as the distance in the longitudinal plane between the lower junction slice 122 and the projection of the junction gripping edge 1233 in the longitudinal plane at a given position along the longitudinal direction L. The upper junction arrow FsJ corresponds to the distance in the longitudinal plane between the upper junction slice 121 and the projection of the junction gripping edge 1233 in the longitudinal plane at a given position along the longitudinal direction L.

[0076] According to an advantageous and preferred embodiment, the junction portion 100 is specifically formed so that the positioning of the junction gripping edge 1233 is such that the ratio between the lower junction deflection FiJ and the junction height HJ is decreasing along the longitudinal direction L from the blade 1 towards the main gripping portion 200.

[0077] Preferably, the ratio between the lower junction deflection FiJ and the junction height HJ has a maximum value between 35% and 55%, preferably a maximum value between 45% and 50%. This maximum value of the ratio corresponds to the endpoint of the junction gripping edge 1233 which is on the blade side, i.e. in the front part of the junction portion 100.

[0078] Furthermore, the ratio between the lower junction arrow FiJ and the junction height HJ has a minimum value equal to the value of the ratio between the lower arrow Fi and the handle height H of the main gripping portion 200. Indeed, this minimum value of the ratio is found at the other endpoint of the junction gripping edge 1233 which is on the side of the main gripping portion 200.

[0079] Thus, the junction gripping edge 1233 and the gripping edge 2233 form a continuous line at the connection area between the junction portion 100 and the main gripping portion 200. This ensures a good gripping feel for the user and the function of the gripping edge is maintained regardless of the portion of the handle 2 considered.

[0080] Each junction gripping edge 1233 is preferably curved, and may include an inflection point at which a change in concavity is present.

[0081] The inflection point is rather placed in the rear part of the junction portion 100, that is to say on the side of the main gripping portion 200. For example, the projection of the inflection point in the longitudinal plane is at a distance from the main gripping portion of between 5 mm and 10 mm, preferably between 6 mm and 9 mm.

[0082] As with the gripping edge 2233 of the main gripping portion 200, the joining gripping edge 1233 helps to secure the user's grip on the knife because it prevents the handle from rotating on itself in the user's hand.

[0083] Furthermore, the junction gripping edge 1233 also facilitates food cutting by a user in a direction substantially perpendicular to the longitudinal direction L of the blade. Due to the decreasing ratio between the lower junction deflection FiJ and the junction height HJ, the junction gripping edge 1233 is inclined relative to the gripping edge 2233, creating resistance when cutting along the longitudinal direction L of the knife. This phenomenon is accentuated when the junction gripping edge 1233 has a curved shape, particularly with a point of inflection. Thanks to the junction gripping edge 1233, cutting is facilitated, and the user's hand is better held in place because it does not slip.

[0084] Preferably, the junction gripping edge 1233 is sufficiently prominent to fit well into the interphalangeal crease when a user grips the knife. In this respect, the junction gripping edge angle θJ, which is the internal angle formed between the upper junction flank portion 1231 and the lower junction flank portion 1232, is preferably less than 160°, preferably between 120° and 150°, and preferably between 135° and 145°.

[0085] According to a preferred but not mandatory additional design, taken alone or in combination with the other proposed designs, the joining portion 100 of the handle 2 has a shape exhibiting a longitudinal flare extending from the blade in the longitudinal plane and defined by a longitudinal joining flare angle αJ formed between the lower joining edge 122 and the upper joining edge 121, the longitudinal joining flare angle αJ, as illustrated in the figure 8 .

[0086] Preferably, the longitudinal flare angle of the junction αJ has a fixed value which is between 15° and 20°.

[0087] In addition to the advantages mentioned above concerning the longitudinal flare of the handle 2, this longitudinal flare specifically provided at the grip portion 100 is particularly advantageous as it ensures that the knife is held in the hand during use, and prevents slippage, especially when the user has a knife grip very close to the blade, for example a pincer grip.

[0088] According to a preferred but not mandatory additional design, taken alone or in combination with the other proposed designs, the joint portion 100 of the handle 2 has a shape having a transverse flare extending from the blade and defined by a transverse joint flare angle βJ formed between the two joint gripping edges 1233 of the joint portion of the handle.

[0089] Preferably, the transverse junction flare angle βJ has a fixed value between 15° and 20°.

[0090] In a specific example, the transverse flare angle of the joint βJ differs from the longitudinal flare angle of the joint αJ, where applicable. This creates a kind of asymmetry in the handle geometry, which enhances the user's grip and strengthens the hand's locking function during a translational movement of the knife along the longitudinal direction L.

[0091] The upper joining edge 121 extends along a straight line since it is in line with the back of the blade 11. It should be noted that the upper joining edge 121 of the joining portion 100 and the upper edge 221 of the main gripping portion 200 form a single straight line which extends the back of the blade 11.

[0092] The lower junction slice 122 extends along a curve. Preferably, the lower junction slice 122 has a slice inflection point where a change in concavity is present.

[0093] The curvature of the lower junction edge 122 combined with the junction flanks 123 form a recession intended in particular for the positioning of the index.

[0094] This recession can for example be positioned as follows: it originates from the proximal portion 13 (or heel) of the blade, gradually thickening towards the main gripping portion 200 and progressively joining this main gripping portion 200. In this way, the lower joining edge 122 prevents the back of the index finger from being injured against the heel of the blade 1 when the hand moves the knife forward.

[0095] The cross-section of this recession can, according to a preferred embodiment, comprise 3 distinct zones which are connected to each other by a tangency in order not to create an edge which could injure the index finger.

[0096] The central zone, corresponding to the lower junction edge 122, has a large radius of curvature that decreases as it moves towards the heel. The width of this zone is such that it allows the knife to remain balanced on its own when placed in the distal interphalangeal joint. That is to say, once the index finger is positioned in the recession zone, the knife does not tip to the left or right.

[0097] The lateral areas corresponding to the junction flanks 123 thin out as they join the blade 1, allowing the index finger to bend naturally around the shape while respecting the shape of the interphalangeal fold.

[0098] The cross-section of the recession is therefore broken down into the part corresponding to the lower junction slice 122 from which the junction flanks 123 extend on either side, with in particular a change of curvature between the elements.

[0099] The fact that the cross-section of this recess is neither round nor elliptical allows for an immediate sense of lateral balance of the knife in the hand, which has the advantage of reassuring the user about the correct positioning of their hand and fingers on the front of the knife. A classic bolster with a round or elliptical lower section will rotate more easily in the hand, and a prismatic bolster will be less comfortable to use.

[0100] Preferably, the knife is formed so that the center of gravity of the knife is in the junction portion, in particular at the level of the trough area of ​​the recession, i.e. the junction area or height HJ of the junction portion has its minimum value.

[0101] Preferably, the junction height HJ of the junction portion 100 has a minimum value between 14 mm and 18 mm, preferably between 15 mm and 16 mm. End portion

[0102] Just like the handle 2 in general, the end portion 300 includes an upper end slice 321 extending substantially in the continuation of the back of the blade 11 in the longitudinal plane, the upper end slice 321 being connected to the upper slice 221 of the main gripping portion 200.

[0103] The end portion 300 further includes a lower end slice 322 extending in the longitudinal plane and opposite the upper end slice 321, the lower end slice being connected to the lower slice 222 of the main gripping portion 200.

[0104] Furthermore, the end portion 300 comprises two end flanks 323 respectively on either side of the longitudinal plane and extending between the upper end slice 321 and the lower end slice 322.

[0105] According to a preferred but not mandatory design, each end flank 323 is formed of a portion of upper end flank 3231 connected to the upper end slice 321 and a portion of lower end flank 3232 connected to the lower end slice 322.

[0106] Preferably, the upper end flank portion 3231 is connected to the lower end flank portion 3232 via an end gripping edge 3233 projecting transversely and constituting the outermost area of ​​the end flank transversely relative to the longitudinal plane.

[0107] The end gripping edge 3233 is preferably positioned specifically to fit into the user's interphalangeal line.

[0108] In this regard and with reference to the figure 11 , the end height HE is defined as corresponding to the distance in the longitudinal plane between the lower end slice 322 and the upper end slice 321 at a given position along the longitudinal direction L.

[0109] Still referring to the figure 11The lower end deflection FiE is defined as the distance in the longitudinal plane between the lower end slice 322 and the projection of the end gripping edge 3233 in the longitudinal plane at a given position along the longitudinal direction L. The upper end deflection FsE corresponds to the distance in the longitudinal plane between the upper end slice 321 and the projection of the end gripping edge 3233 in the longitudinal plane at a given position along the longitudinal direction L.

[0110] According to an advantageous and preferred embodiment, the end portion 300 is specifically formed so that the positioning of the end gripping edge 3233 is such that the ratio between the lower end deflection FiE and the end height HE is decreasing along the longitudinal direction L from a free end of the end portion 300 towards the main gripping portion 200.

[0111] Preferably, the ratio between the lower end deflection FiE and the end height HE has a minimum value between 0% and 10%, preferably a minimum value between 2% and 5%.

[0112] Furthermore, the ratio between the lower end deflection FiE and the end height HE has a maximum value equal to the value of the ratio between the lower deflection Fi and the height H of the main gripping portion 200.

[0113] Thus, the end gripping edge 3233 and the gripping edge 2233 form a continuous line at the connection area between the end portion 300 and the main gripping portion 200. This ensures a good gripping feel for the user and the function of the gripping edge is maintained regardless of the portion of the handle 2 considered.

[0114] Each end gripping edge 3233 is curved and does not have a point of inflection.

[0115] As with the gripping edge 2233 of the main gripping portion 200, the end gripping edge 3233 helps to secure the user's grip on the knife because it prevents the handle from rotating in the user's hand.

[0116] Due to the decreasing ratio between the lower end deflection FiE and the end height HE, the end gripping edge 3233 is inclined relative to the gripping edge 2233, creating resistance when cutting is performed along the longitudinal direction L of the knife. This phenomenon is accentuated when the end gripping edge 3233 has a curved shape. Thanks to the end gripping edge 3233, cutting is facilitated and the user's hand is better held in place because it does not slip.

[0117] Preferably, the end gripping edge 3233 is sufficiently prominent to fit well into the interphalangeal crease when a user grips the knife. In this respect, the end gripping edge angle θE, which is the internal angle formed between the upper end flank portion 3231 and the lower end flank portion 3232, is preferably less than 160°, preferably between 120° and 150°, and preferably between 135° and 145°.

[0118] The upper end slice 321 extends along a straight line since it is in line with the back of the blade 11. It should be noted that the upper end slice 321 of the end portion 300 and the upper slice 221 of the main gripping portion 200 form a single straight line which extends the back of the blade 11.

[0119] The lower end slice 322 can extend along a curve. Preferably, the lower end slice 322 has no inflection points. Gorges

[0120] According to a preferred but not compulsory additional design, taken alone or in combination with the other proposed designs, the handle 2 comprises a plurality of grooves 400 formed on at least one of the handle flanks 23.

[0121] Preferably, the grooves 400 are distinct from one another, the plurality of grooves 400 comprising a reference groove 410 positioned closest to the blade and the other grooves 400 being arranged next to one another from the reference groove 410 along the handle 2 towards a free end of the handle 2 opposite the blade 1.

[0122] Each 400 groove extends over a certain length and can be straight, as in the knife example shown in the diagram. figures 12 to 17 , or be curved as in the knife example illustrated in figures 18 to 21 It should be noted that a specific handle design with straight grooves and other curved grooves could be considered.

[0123] Each groove 400 has a certain width and a certain depth from the surface of the corresponding handle flank 23.

[0124] The 400 groove generally has a fixed width, as is the case for a straight groove, but it can also have a variable width, particularly for a curved groove. In any case, a maximum width for the 400 groove can be defined, measured at the surface of the handle's side.

[0125] The maximum width has a value of at least 2 mm, and is preferably at most equal to 10 mm.

[0126] Each 400 groove can have a different profile, but 400 grooves generally have a specific profile; the profile of a 400 groove is defined in particular by its cross-section. Such a cross-section can, for example, be rectangular, circular, or elliptical.

[0127] Each 400 groove also has a maximum depth, this maximum depth being at least 0.2 mm. Preferably, the maximum depth is not greater than 1 mm.

[0128] Furthermore, the maximum depth is at most equal to one third of the maximum width defined above.

[0129] Preferably, the maximum depth has a value between 5% and 12% of the value of the maximum width, preferably between 6% and 11%, for example around 10%.

[0130] For example, the maximum width is between 2.5 mm and 6.5 mm, preferably between 3.5 mm and 5 mm, and the maximum depth is between 0.25 mm and 0.5 mm, preferably between 0.35 mm and 0.45 mm.

[0131] For each groove 400 of the handle, we can define an average extension direction 401. We define more specifically such an average extension direction as the line passing through the middle of each of the sides forming the ends of the groove 400 considered.

[0132] The average extension direction 401 of each 400 groove was represented by dashed lines at the figure 16 for an example of handles with straight grooves, and at the figure 21 for an example of handles with curved grooves.

[0133] The orientation of each of the grooves 400 can be defined thanks to this average extension direction 401. In this regard, we consider in particular the groove angle γ corresponding to the angle formed between the projection in the longitudinal plane of the average extension direction 401 and the longitudinal direction L.

[0134] The arrangement of the various grooves 400 can be defined with respect to the reference groove 410. Such a reference groove 410 is oriented according to a reference groove angle γR which is preferably between 0° and 10°. Preferably, the reference groove angle γR is between 2° and 6°.

[0135] Each subsequent 400 groove in the plurality of grooves has a groove angle γ greater than the reference groove angle γR, the respective γ groove angles of two adjacent 400 grooves being different.

[0136] Preferably, the respective throat angles γ of two adjacent 400 throats differ by an angle of at least 1°, and preferably an angle between 4° and 8°, and even more preferably an angle between 5° and 7°.

[0137] According to a first possible arrangement of the grooves 400, each groove 400 in the plurality of grooves has, in the direction from the reference groove 410 towards the free end of the handle 2, a groove angle γ greater than the groove angle γ of the preceding grooves. In other words, the further a groove 400 is from the reference groove 410 in the direction towards the free end of the handle 2, the larger the corresponding groove angle γ.

[0138] According to a second possible arrangement of the 400 grooves, the groove angle γ of the plurality of 400 grooves is initially increasing relative to the reference groove angle γR as the corresponding groove moves further away from the reference groove 410, and then decreasing as it approaches the free end of the handle 2. Examples of handles of the figures 12 to 16 and figures 17 to 21 correspond to this particular arrangement.

[0139] The use of 400 grooves with the specific geometry, orientation and arrangement offered is particularly advantageous as it allows the user's hand to grip the knife, which improves the grip on the one hand and facilitates cutting while ensuring user safety, preventing the hand from slipping relative to the handle.

[0140] The shape and orientation of the 400 grooves allows the hand to fit the external shape of the handle well, and increases the contact area with the surface of the hand.

[0141] The specific orientation of the 400 grooves also has the particular advantage of creating zones that oppose the movement imparted by the user with their hand when cutting food.

[0142] Specifically, the 400 grooves located on the front side of the handle 2, i.e., the blade side, are oriented substantially parallel to the longitudinal direction L, or slightly inclined relative to it. These 400 grooves thus facilitate food cutting by the user in a direction substantially perpendicular to the longitudinal direction L of the blade. It should be noted that such cuts are generally made from the front of the handle, i.e., towards the joint portion.

[0143] Moving away from the blade 1, the 400 grooves tend to straighten to have a more pronounced inclination relative to the longitudinal direction L, for example with angles of the order of 25° or more, which gives the corresponding 400 grooves, namely to favor the cutting of food by a user in a direction substantially perpendicular to the longitudinal direction L of the blade, but also in a direction of translation along the longitudinal direction L.

[0144] According to a particular example of implementation, and as represented in figures 17 to 21 , a first part of the grooves 400 are curved with a concavity oriented towards the side of the upper handle slice 21 and a second part of the grooves 400 of the plurality of grooves are curved with a concavity oriented towards the side of the lower handle slice 22.

[0145] The first part of the grooves 400 having a concavity oriented towards the side of the upper handle edge 21 are preferably arranged together, on the front side of the handle, i.e. close to the blade 1.

[0146] The second part of the grooves 400 having a concavity oriented towards the side of the lower handle edge 22 are also preferably arranged together, on the rear side of the handle, that is to say close to the free end of the handle 2.

[0147] The fact that the grooves 400 exhibit such a change in concavity further facilitates cutting, particularly during a cut in translation along the longitudinal direction L. Indeed, during such a cut moving towards the rear of the knife (i.e., from the blade towards the handle), the force exerted by the hand is concentrated towards the front of the handle 2, and the concavity of the grooves 400 positioned at the front of the handle 2 thus promotes cooperation between the hand and the handle during the cut. Conversely, during a cut in translation moving towards the front of the knife (i.e., from the handle towards the blade), the force exerted by the hand is concentrated towards the middle or rear of the handle 2, and the concavity of the grooves 400 positioned at the rear of the handle 2 thus promotes cooperation between the hand and the handle during the cut.

[0148] The grooves could be formed on only one of the two sides of the handle. However, it is preferable for each side of the handle to have multiple grooves. In this case, it is preferable for the grooves 400 on one of the handle sides 23 to be symmetrical to the grooves 400 on the other handle sides 23 with respect to the longitudinal plane. This allows, in particular, for an ambidextrous knife, usable with either the right or left hand.

[0149] Let us recall that this particular design with the provision of 400 grooves made on the sides of the handle 2, can be combined with one or more of the designs previously described, including the proposed longitudinal flare, the proposed transverse flare, and the formation of a specific gripping edge.

[0150] In the case where the handle 2 includes a gripping edge 233 separating the upper handle flank portion 231 from the lower handle flank portion 232, then the grooves are preferably provided in the upper handle flank portion 231 of the corresponding handle flank 23. General dimensions and shape of the knife

[0151] One of the advantages of the proposed knife is that its design is based on principles that are adaptable to all sizes and shapes of knives.

[0152] The design principles described are particularly applicable to both small and large knives.

[0153] In the culinary field, small knives include paring knives or utility knives, and large knives include chef's knives, santoku knives, bread knives, or slicing knives.

[0154] The example of a knife illustrated in figures 1 to 4 corresponds to a chef's type knife, in which several combined design parameters from those described above have been applied, namely the proposed longitudinal flare, the proposed transverse flare, and the formation of a specific gripping edge.

[0155] The example of a knife illustrated in figures 12 to 15 also corresponds to a chef's type knife, in which several combined design parameters from those described above have been applied, namely the proposed longitudinal flare, the proposed transverse flare, the formation of a specific gripping edge, and the provision of grooves, these grooves being straight.

[0156] The example of a knife illustrated in Figures 17 to 20also corresponds to a chef's type knife, in which several combined design parameters from those described above have been applied, namely the proposed longitudinal flare, the proposed transverse flare, the formation of a specific gripping edge, and the provision of grooves, these grooves being curved.

[0157] Digital references 1 blade 11 back of blade 12 blade edge 13 distal end 14 proximal end 2 handle 21 upper handle slice 22 lower handle slice 23 handle side 231 portion of upper handle side 232 portion of lower handle side 233 handle grip edge 100 junction portion 121 upper junction slice 122 lower junction slice 123 junction flank 1231 upper junction flank portion 1232 lower junction flank portion 1233 junction gripping edge 200 main gripping portion 221 upper slice 222 lower slice 223 flank 2231 upper flank portion 2232 lower flank portion 2233 gripping edge 300 end portion 321 upper end slice 322 lower end slice 323 end flank 3231 upper end flank portion 3232 lower end flank portion 3233 end gripping edge 400 gorges 410 reference gorge 401 average extension direction

Claims

1. A knife, comprising: - a blade (1) having a blade spine (11) and a cutting edge (12) opposite the blade spine (11), the blade (1) extending in a longitudinal plane in a longitudinal direction (L) between a distal end (13) and a proximal end (14), - a handle (2) extending from the proximal end (14) of the blade (1) in the longitudinal direction (L), the handle (2) having a junction portion (100) connected to the proximal end (14) of the blade (1), and a main gripping portion (200) extending from the junction portion (100), the main gripping portion (200) having: - an upper edge (221) extending substantially in the extension of the blade spine (11) in the longitudinal plane, - a lower edge (222) extending along the longitudinal plane and opposite the upper edge (221), - two sides (23) respectively on either side of the longitudinal plane and extending between the upper edge (221) and the lower edge (222), - each side (23) consisting of an upper side portion (2231) connected to the upper edge (221) and a lower side portion (2232) connected to the lower edge (222), the upper side portion (2231) being connected to the lower side portion (2232) by means of a gripping ridge (2233) projecting transversely and constituting the outermost side area, transversely relative to the longitudinal plane, wherein the main gripping portion (200) of the handle (2) has a shape having a longitudinal flare extending from the junction portion (100) in the longitudinal plane and defined by a longitudinal flare angle α formed between the lower edge (222) and the upper edge (221), the longitudinal flare angle α having a fixed value of between 3° and 8°, and wherein the junction portion (100) comprises an upper junction edge (121) extending substantially in the extension of the blade spine (11) along the longitudinal plane, the upper junction edge (121) connecting the blade spine (11) to the upper edge (221) of the main gripping portion (200), a lower junction edge (122) extending along the longitudinal plane and opposite the upper junction edge (121), the lower junction edge (122) connecting the proximal end (14) of the blade (1) to the lower edge (222) of the main gripping portion (200), two junction sides (123) respectively on either side of the longitudinal plane and extending between the upper junction edge (121) and the lower junction edge (122), each junction side (123) being formed of a portion of the upper junction side (1231) connected to the upper junction edge (121), and a lower junction side portion (1232) connected to the lower junction edge (122), the upper junction side portion (1231) being connected to the lower junction side portion (1232) by means of a junction gripping edge (1233) projecting transversely and constituting the outermost area of the junction side, transversely to the longitudinal plane, wherein the distance in the longitudinal plane between the lower junction edge (122) and the upper junction edge (121), at a given position in the longitudinal direction (L), defines a junction height (HJ), and the distance in the longitudinal plane between the lower junction edge (122) and the projection of the junction gripping edge (1233) in the longitudinal plane, at a given position in the longitudinal direction (L), defines a lower junction deflection (FiJ), the ratio between the lower junction deflection (FiJ) and the junction height (HJ) decreases in the longitudinal direction (L) from the blade (1) toward the main gripping portion (200).

2. The knife according to claim 1, wherein the longitudinal flare angle α has a fixed value between 3.5° and 5.5°.

3. The knife according to either of claims 1 and 2, wherein the main gripping portion (200) of the handle (2) has a shape with a transverse flare extending from the junction portion (100) and defined by a transverse flare angle β formed between the two gripping edges of the sides (23) of the main gripping portion (200) of the handle (2), the transverse flare angle β having a fixed value of between 1° and 5°.

4. The knife according to claim 3, wherein the transverse flare angle β has a fixed value of between 1.5° and 4°, preferably a fixed value of between 2° and 3°.

5. The knife according to any of claims 1 to 4, wherein the upper edge (221) and the lower edge (222) each extend along a straight line, and wherein each gripping edge (2233) extends along a straight line.

6. The knife according to any of claims 1 to 5, wherein the handle height (H) of the main gripping portion (200) at the connection with the junction portion (100) has a value between 17 mm and 22 mm, preferably between 18 mm and 21 mm, more preferably of the order of 20 mm.

7. The knife according to any of claims 1 to 6, wherein each junction gripping edge (1233) is curved and includes an inflection point at which a change in concavity is present.

8. The knife according to any of claims 1 to 7, wherein the junction portion (100) of the handle (2) has a shape having a longitudinal flare extending from the blade (1) in the longitudinal plane and defined by a longitudinal junction flare angle αJ formed between the lower junction edge (122) and the upper junction edge (121), the longitudinal junction flare angle αJ having a fixed value between 15° and 20°.

9. The knife according to any of claims 1 to 8, wherein the junction portion (100) of the handle (2) has a shape having a transverse flare extending from the blade (1) and defined by a junction transverse flare angle βJ formed between the two junction gripping edges of the junction portion (100) of the handle (2), the junction transverse flare angle βJ having a fixed value between 15° and 20°.

10. The knife according to any of claims 1 to 9, wherein the upper junction edge (121) extends along a straight line and the lower junction edge (122) extends along a curve having an edge inflection point at which a change in concavity is present.

11. The knife according to any of claims 1 to 10, wherein the junction height (HJ) of the junction portion (100) has a minimum value of between 14 mm and 18 mm, preferably between 15 mm and 16 mm.

12. The knife according to any of claims 1 to 11, wherein the handle (2) further comprises an end portion (300) connected to and extending from the main gripping portion (200), the end portion (300) comprising: an upper end edge (321) extending substantially in line with the blade spine (11) along the longitudinal plane, the upper end edge (321) being connected to the upper edge (221) of the main gripping portion (200), a lower end edge (322) extending along the longitudinal plane and opposite the upper end edge, the lower end edge (322) being connected to the lower edge (222) of the main gripping portion (200), two end sides (323) respectively on either side of the longitudinal plane and extending between the edge upper end edge (321) and the lower end edge (322), each end side (323) being formed of an upper end side portion (3231) connected to the upper end edge (321), and a lower end side portion (3232) connected to the lower end edge (322), the upper end side portion (3231) being connected to the lower end side portion (3232) by means of an end gripping edge (3233) projecting transversely and constituting the outermost end side area, transversely to the longitudinal plane, wherein the distance in the longitudinal plane between the lower end edge (322) and the upper end edge (321), at a given position in the longitudinal direction (L), defines an end height (HE), and the distance in the longitudinal plane between the lower end edge (322) and the projection of the end gripping edge (3233) in the longitudinal plane, at a given position in the longitudinal direction (L), defines a lower end deflection (FiE), the ratio between the lower end deflection (FiE) and the end height (HE) increasing in the longitudinal direction (L) starting from a free end of the end portion (300) toward the main gripping portion (200).

13. The knife according to claim 12, wherein each end gripping edge (3233) is curved and has no inflection point.

14. The knife according to any of claims 12 to 13, wherein the upper end edge (321) extends along a straight line and the lower end edge (322) extends along a curve having no inflection point.

15. The knife according to any of claims 1 to 14, characterized in that it is monobloc.

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