DE102021121231A1 - Knife - Google Patents

Abstract

The invention relates to a knife with a blade and a handle body that is hollow at least in some areas, the blade being able to be brought into a safety position, in which it is completely accommodated in the handle body, and into a cutting position, in which it protrudes at least in some areas from an opening in the handle body. A handle is also provided which, when actuated, brings the blade into its cutting position. The invention now proposes that a pivoting element be provided, which is arranged on or in the handle body so that it can pivot directly or indirectly about a pivot axis, with the pivoting element being pivoted when the handle is actuated. Furthermore, it is provided that the blade is brought into its cutting position by the pivoting movement of the pivoting element.

Description

The invention relates to a knife of the type mentioned in the introductory clause of claim 1. Such knives are also known as safety knives and are used in many ways, for example in discounters, in warehouses and logistics areas, in trade, but also in the home. Such safety knives are often used to open cartons and packaging, but also to cut goods, such as carpets or other flat goods. Depending on the area of application, it can happen that operators have to carry out many cutting processes a day as part of their work, for example 1,000 or 2,000 pieces.

In particular, when an operator has to carry out so many cutting processes every day, it is important that the blade is operated as smoothly as possible in order to avoid fatigue in the hands or injuries. In addition to safety knives, where the blade is pushed forward with the thumb or a finger, there are also those with a handle that can be operated with the whole hand or with several fingers at the same time.

The EP 3 030 385 B1 describes a safety knife with such a handle. In the knife described there, a blade carrier is provided which, in a blade changing position in which the blade of the knife can be changed, protrudes further out of the housing of the knife and in which a lock is provided for releasably securing the blade carrier in the blade changing position. The inner structure of the knife is not described in detail.

Furthermore, safety knives are known from the prior art in which, when the handle is actuated, two parts running obliquely to one another are moved towards one another. As a result, the corresponding knife becomes relatively stiff and the parts must be regularly provided with a lubricant in order to prevent excessive frictional forces.

It is therefore the object of the invention to avoid the aforementioned disadvantages and to design a safety knife which is smooth-running and ergonomic to operate, but which is compact and safe to use. This object is achieved by the characterizing features of claim 1, which have the following special meaning.

To move the blade, a pivoting element is provided, which is mounted on or in the handle body so that it can pivot directly or indirectly about a pivot axis. When the handle is actuated, the pivoting movement of the pivoting element is carried out, which in turn brings the blade into its cutting position. The pivoting element enables the handle to be actuated very smoothly, which can be implemented in a very space-saving manner and is maintenance-free.

In a preferred embodiment, the pivoting element has a bolt which is connected to a first elongated hole which is arranged directly or indirectly on the handle. As a result, the movement of the handle is transmitted to the pivoting element with the interposition of the bolt and the first elongated hole. This transmission is also very smooth and maintenance-free.

Furthermore advantageously, the pivoting element has a second elongated hole, while a pin is provided directly or indirectly on the blade, which engages in this second elongated hole. With a pivoting movement of the pivoting element, the pin moves in the second elongated hole, causing the blade to move between the safety position and the cutting position and back again. This double deflection enables the handle to be operated very smoothly and the blade to be moved as well.

A feed element can also be provided, to which the blade can be detachably fastened and which remains permanently inside the handle body. This can then have the pin which interacts with the second elongated hole on the pivoting element. The blade is advantageously arranged behind the feed element in the feed direction, so that it projects out of the handle body in its cutting position, while the feed element remains in the handle body. In order to prevent the feed element from being guided out of the handle body, a limit can be provided on the feed element which, in the cutting position of the blade, interacts with a counter limit on the handle body by resting against it. It is then not possible to push the feed element further out of the handle body, but it remains completely in the handle body.

Furthermore, there can be at least one spring which strives to move the blade into its safety position. When the handle is actuated, the force of the spring is then overcome in order to move the blade in the feed direction into its cutting position with the pivot element being interposed. After the cutting process, the force of the spring moves the blade back into its safety position. Also the Handle is brought back to its original position by spring force. The spring is preferably arranged with its one end on the feed element or the blade and with the other end on the handle. By arranging the two ends of the spring on two moving parts, the spring force to be overcome by the operator when operating the handle is minimized, which also leads to a particularly smooth-running and ergonomic operation of the knife. In addition, it is avoided to provide further attachment points for the spring in the handle body, which saves space and thus enables a slim and compact handle body.

The blade can preferably be encapsulated with a plastic jacket, at least in certain areas. The best way to do this is to choose a plastic with good sliding properties that causes as little friction as possible when moving the blade. In addition, the blade is then safer to touch with the hand - especially when changing the blade, e.g. due to wear - because the overmoulded area has no sharp edges or corners, thus minimizing the risk of injury.

In a further preferred exemplary embodiment, the handle body has at least one hollow on its inside near the opening, while the plastic casing of the blade has at least one nose. The nose and hollow are arranged in such a way that they are adjacent to one another when the blade is in the cutting position. If a cutting process is now carried out, the nose on the plastic casing of the blade penetrates into the depression on the inside of the handle body. This has the advantage that the nose and hollow absorb a large part of the forces generated during the cutting process and these do not affect the movement mechanics that are located inside the handle body. This protects the movement mechanism from greater stress and makes it more durable. The nose on the plastic casing is replaced every time the blade is changed. In this way, no greater wear can occur here.

The handle can have two coaxially aligned pivot points for the pivoting movement that it performs when it is actuated. These can be spaced so far apart that the blade and/or the plastic casing and/or the feed element move between the pivot points when the blade moves. This ensures that the handle body can be made very small, handy and compact, since this saves space.

Furthermore, a barrier is preferably provided which has two different layers. In its first position, the release position, normal operation of the blade is permitted, while in its second position, the locked position, the blade is prevented from being moved to its cutting position. In the locked position, it can be avoided that the blade unintentionally reaches its cutting position, for example when the knife is transported in a pocket or the like.

The lock can have a stop which, when the lock is in the locked position, interacts with a counter-stop on the handle. This prevents the handle from being actuated and thus also prevents the blade from being moved into its cutting position. The blade is held in its safe position by the force of the spring.

Preferably, the lock includes a button that engages through the handle body. If the button is pressed from one side of the handle body, the lock is placed in its locked position; when the button is actuated from the other side, the lock is brought into its release position. This offers an easy way of actuating the lock, even if the operator is wearing gloves, for example.

In order to further simplify the operation of the button, symbols can be arranged on both sides which indicate whether the lock is brought into its blocked position or into its released position when it is actuated from the respective side. For example, the symbols can be designed as a closed padlock for the blocking algae and as an open padlock for the release position. Other types of symbols or even letters, numbers or words can also be used here.
The button of the lock is particularly preferably designed approximately in the shape of a prism and has a flexible elastic area with a projection. This projection is in operative connection with a counter-projection. The counter-projection can be arranged on the handle body or on the handle or on another component. When the button is actuated, the projection and counter-projection collide. A brief elastic deformation of the flexible elastic area allows the projection to overcome the counter-projection and move the lock into the respective other position, in which it also remains until the button is pressed again. Because the button does not protrude beyond the outside of the handle body in either position of the lock, unintentional actuation of the button or the lock is not possible, so that the knife is secured when the lock is in the locked position, even if there are several there are other items in the pocket that also contains the knife.

• 1: ein erfindungsgemäßes Messer mit Klinge in Sicherheitsposition perspektivisch von oben,
• 2: das Messer aus 1 mit Klinge in Schneidposition,
• 3: das Messer ohne Klinge, Vorschubelement, Handhabe und obere Hälfte des Griffkörpers,
• 4: das Messer aus 3 mit Handhabe,
• 5: das Messer aus den 3 und 4 mit Vorschubelement und mit oberer Hälfte des Griffkörpers ohne untere Hälfte des Griffkörpers,
• 6: das Messer gemäß 3 und 4 mit Vorschubelement, Klinge und Feder in Sicherheitsposition,
• 7: das Messer aus 6 ohne Feder in Schneidposition,
• 8: das Messer aus 6 und 7 in Sicherheitsposition mit Sperre in Sperrlage,
• 9: eine erfindungsgemäße Klinge mit Kunststoffmantel,
• 10: das Messer aus 8 mit Sperre in Freigabelage
• 11: das Messer aus 10 mit einer Belastung beim Schneidvorgang,
• 12: das erfindungsgemäße Messer in Vorderansicht,
• 13: das Messer aus 12 im Schnitt, entlang der Achse XIII-XIII
• 14: ein erfindungsgemäßer Knopf perspektivisch von der Seite,
• 15: der Knopf aus 14 perspektivisch von unten,
• 16: das Messer in Seitenansicht von der anderen Seite,
• 17: das Messer aus 16 im Schnitt, entlang der Achse XVII-XVII, mit Sperre in Freigabelage,
• 18: das Messer im Schnitt gemäß 17 mit Sperre in Sperrlage.

Further advantages and embodiments of the invention result from the following description, the dependent claims and the drawings. In the drawings, the invention is shown in an embodiment. Show it:

• 1 : a knife according to the invention with a blade in the safety position in perspective from above,
• 2 : the knife off 1 with blade in cutting position,
• 3 : the knife without blade, feed element, handle and upper half of the handle body,
• 4 : the knife off 3 with handle
• 5 : the knife from the 3 and 4 with feed element and with the upper half of the handle body without the lower half of the handle body,
• 6 : the knife according to 3 and 4 with feed element, blade and spring in safety position,
• 7 : the knife off 6 without spring in cutting position,
• 8th : the knife off 6 and 7 in safety position with lock in locked position,
• 9 : a blade according to the invention with a plastic sheath,
• 10 : the knife off 8th with lock in release position
• 11 : the knife off 10 with a load during the cutting process,
• 12 : the knife according to the invention in front view,
• 13 : the knife off 12 in section, along the XIII-XIII axis
• 14 : a button according to the invention in perspective from the side,
• 15 : the button off 14 perspective from below,
• 16 : the knife in side view from the other side,
• 17 : the knife off 16 in section, along the XVII-XVII axis, with the lock in the release position,
• 18 : according to the knife in the cut 17 with lock in lock position.

The 1 and 2 show an embodiment of the knife 10 according to the invention. One side 14 of the handle body 11 can be seen, as well as the handle 50 and the button 62 of the lock 60. In 1 the blade 20 is shown in its safety position 20.1. This means that the blade 20 is completely accommodated inside the handle body 11 . The handle 50 is not actuated either. In 2 the handle 50 is shown actuated and the blade 20 is in its cutting position 20.2 and protrudes in some areas from the opening 12 of the handle body 11. In this position, a cutting operation can be performed.

The internal structure of the knife 10 illustrate the 3 until 7 . The knife 10 is shown without the upper half of the handle body 11 in the direction of the drawing. 3 shows the pivoting element 30 which can be pivoted about a pivot axis 33 and has a bolt 31 and a second slot 32 . When interacting with the handle 50, the bolt 31 moves in the first elongated hole 51 of the handle 50, as in FIG 4 you can see. If the handle 50 is actuated, it moves the first elongated hole 51 and, in doing so, moves the bolt 31 with it, which thereby pivots the pivoting element 30 .

Out of 5 it can be seen that a pin 44 is provided on the feed element 40 . This engages in the second elongated hole 32 on the pivoting element 30 . If the pivoting element 30 is pivoted by actuating the handle 50, the second slot 32 also moves and pushes the feed element 40 by moving the pin 44 in the second slot 32 in the direction of the opening 12 of the handle body 11. If a blade 20 is arranged on the feed element 40 is, by actuating the handle 50 by the components described, it is pushed forward through the opening 12 in the handle body 11 and thus comes into its cutting position 20.2.

Furthermore, one recognizes in 5 also two coaxially arranged articulation points 52 for the handle 50. When the handle 50 is actuated, it is pivoted about the two articulation points 52. The spacing of the pivot points 52 has the advantage that the spacing was chosen such that the blade 20 or the plastic casing 21 and also the feed element 40 can move between the two pivot points 52 . In this way, space can be saved and the handle body 11 can be made slimmer and easier to handle.

In addition, one recognizes in 6 also the spring 41, which strives to keep the blade 20 in its safety position 20.1. The spring 40 is fastened to the feed element 40 at one end 42 and to the handle 50 at the other end 43. The spring 40 is therefore not only tensioned in the handle body 11 when the handle 50 is actuated, but is also moved. As a result, when the handle 50 is actuated, it has to be less Spring force can be overcome, which makes operation very smooth and ergonomic.

The structure of the blade 20 is from the 6 until 9 clearly. The blade 20 is overmoulded with a plastic jacket 21 in some areas. This makes handling the blade 20 safer when changing blades, since the plastic casing 21 has no sharp edges and can be touched by an operator without any problems. In addition, the blade 20 is connected to the feed element 40 via the plastic jacket 21 . Furthermore, the blade 20 has a nose 22 on its plastic casing 21 while a hollow 13 is provided on the handle body 11 . The peculiarity of these parts will be explained in more detail later.

In particular 7 and 8th one can also see the interaction of the limit 45 on the feed element 40 and the counter-limit 17 on the handle body 11. If the blade 20 is moved into its cutting position 20.2, the limit 45 on the feed element 40 strikes the counter-limit 17. A further movement of the feed element 40 in Direction of the opening 12 is no longer possible. This prevents the feed element 40 from being pushed further out of the handle body 11 than is necessary for the normal cutting position 20.2 of the blade 20.

How out 10 As can be seen, the nose 22 on the blade 20 and the hollow 13 on the handle body 11 are arranged directly adjacent to one another as soon as the blade 20 has been brought into its cutting position 20.2. If a cutting process is now carried out, the blade 20 is subjected to a force in the direction of the arrow in FIG 11 . As a result, the blade 20 is slightly deflected upwards, as a result of which the nose 22 penetrates into the hollow 13 . This prevents these forces from being passed on to the mimics of movement within the handle body 11 during the cutting process or any other loading of the blade 20, which could additionally load them and, in extreme cases, permanently damage them.

Furthermore, one recognizes in the 10 and 11 that the lock 60 is in its release position 60.1, in which the stop 61 on the lock 60 and the counter-stop 53 on the handle 50 are not engaged with one another. The lock 60 includes a button 62 which extends through the handle body 11 and which is marked on its outside with a symbol 63--here a closed padlock. If you press the button 62 from the one side 14 of the knife 10 shown here, the lock 60 is brought into its locking position 60.2.

This is at the in 12 and 13 shown knife 10 takes place. In the sectional view in 13 one can see how the stop 61 on the lock 60 interacts with the counter-stop 53 on the handle 50 and thus blocks actuation of the handle 50 . As a result, the blade 20 cannot be brought into its cutting position 20.2.

The structure of the button 62 is in the 14 and 15 shown closer. The button 62 also has the stop 61 in addition to the symbol 63 . In addition, a flexible elastic area 64 is provided, on which a projection 65 is arranged. By actuating the button 62, the lock 60 is moved into its release position 60.1 or into its locking alga 60.2. Because the button 62 is embedded in the handle body 11, it is not possible to inadvertently actuate the button 62 even when the knife 10 is being stored or transported in a pocket occupied with other objects.

The 16 until 18 finally clarify the two positions of the lock 60. It can be seen that the button 62 on the other side 15 of the knife 10 is equipped with another symbol 63, which here represents an open padlock to indicate that when the button 62 is actuated from this side is transferred from the lock 60 in its release position 60.1.

The sectional view in 17 shows the lock 60 in the release position 60.1. The button 62 was pressed on the left side in the drawing. The projection 65 on the flexible elastic area 64 of the lock 60 is arranged on the right next to the counter-projection 16 on the handle body 11 . To lock 60 now in the in 18 To bring the position shown, the button 62 must be pressed from the right side. The projection 65 must then overcome the counter-projection 16, which it accomplishes with temporary elastic deformation of the flexible elastic area 64. As soon as the counter-projection 16 has been overcome, the elastic deformation of the flexible elastic area 64 returns. The combination of projection 65, counter-projection 16 and flexible elastic area 64 also ensures that the lock 60 cannot accidentally move from your locked position 60.2 to its release position 60.1 or back.

Finally, it should also be pointed out that the embodiments presented here are merely exemplary implementations of the invention. This is not limited to this. Rather, modifications and variations are possible. In particular, the kinematic reversal is also included and the arrangement of the bolts or pins and elongated holes can be reversed.

Reference List

10

Knife

11

grip body

12

Opening at 11

13

cool in 11

14

A page of 11

15

Other side of 11

16

counter projection

17

counter limitation

20

blade

20.1

security position of 20

20.2

cutting position of 20

21

plastic jacket

22

Nose

30

swivel element

31

bolt

32

Second slot

33

Pan axis of 30

40

feed element

41

Feather

42

One end of 41

43

Different end of 41

44

cones

45

limitation

50

handle

51

First slot

52

Pivot point at 50

53

counterattack

60

lock

60.1

release position

60.2

blocking position

61

attack

62

Button

63

symbol

64

Flexible elastic area

65

head Start

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• EP 3030385 B1 [0003]

Claims (15)

Knife (10) with a blade (20) and a handle body (11) that is hollow at least in some areas, wherein the blade (20) moves into a safety position (20.1), in which it is completely accommodated in the handle body (11), and into a cutting position (20.2 ), in which it protrudes at least partially from an opening (12) in the handle body (11), and wherein a handle (50) is provided which, when actuated, brings the blade (20) into its cutting position (20.2), thereby characterized in that a pivoting element (30) is provided, which is arranged on or in the handle body (11) so that it can pivot directly or indirectly about a pivot axis (33), the pivoting element (30) being pivoted when the handle (50) is actuated and that the blade (20) is brought into its cutting position (20.2) by the pivoting movement of the pivoting element (30). knife (10) after claim 1 , characterized in that the pivoting element (30) has a bolt (31) which cooperates with a first elongated hole (51) on the handle (50), whereby the movement of the handle (50) when it is actuated to the pivoting movement of the pivoting element ( 30) is transmitted. Knife (10) according to one of Claims 1 or 2 , characterized in that the pivoting element (30) has a second elongated hole (32), a pin (44) being provided directly or indirectly on the blade (20) which engages in the second elongated hole (32) and during the pivoting movement of the pivoting element (30) is moved in the second elongated hole (32), thereby causing the blade (20) to move between the safety position (20.1) and the cutting position (20.2). Knife (10) according to one of Claims 1 until 3 , characterized in that a feed element (40) is provided, on which the pin (44) is located and on which the blade (20) is arranged releasably attachable. knife (10) after claim 7 , characterized in that a limitation (45) is provided on the feed element (40), while the handle body (11) comprises a counter limitation (17). Knife (10) according to one of Claims 1 until 5 , characterized in that at least one spring (41) is provided which strives to move the blade (20) into its safety position (20.1). Knife (10) after the claims 4 or 5 and after claim 6 , characterized in that one end (42) of the spring (41) is arranged on the blade (20) and/or on the feed element (40) and the other end (43) of the spring (41) on the handle (50). is. Knife (10) according to one of Claims 1 until 7 , characterized in that the blade (20) is encapsulated in some areas with a plastic jacket (21). knife (10) after claim 8 , characterized in that at least one depression (13) is provided on the handle body (11) near the opening (12), while the blade (20) has at least one nose (22) in its plastic casing (21) which, in the cutting position ( 20.2) of the blade (20) are arranged adjacent to one another. Knife (10) according to one of Claims 1 until 9 , characterized in that the handle (50) is arranged pivotably, wherein the pivot axis of the handle (50) has two coaxial pivot points (52) on the handle body (11), which are spaced so far apart that the blade (20) and / or the plastic casing (12) and/or the feed element (40) can move between the pivot points (52). Knife (10) according to one of Claims 1 until 10 , characterized in that a lock (60) is provided which in its first position, the release position (60.1), allows normal operation of the blade (20), but in its second position, the lock position (60.2), prevents that the blade (20) can be brought into its cutting position (20.2). knife (10) after claim 11 , characterized in that a stop (61) is provided on the lock (60) which interacts with a counter-stop (53) on the handle (50) and thus prevents the handle (50) from being operable when the lock ( 60) is in its locked position (60.2). Knife (10) according to one of Claims 11 or 12 , characterized in that the lock (60) comprises a button (62) which reaches through the handle body (11), wherein when the one side (14) of the handle body (11) is actuated, the lock (60) moves into its locked position ( 60.2) and upon actuation from the other side (15) of the handle body (11), the lock (60) is brought into its release position (60.1). knife (10) after Claim 13 , characterized in that the button (62) carries a symbol (63) on the respective side to indicate whether when the button (62) is actuated, the blocking position (60.2) or the release position (60.1) is reached. Knife (10) according to one of Claims 11 until 14 , characterized in that the button (62) of the lock (60) is designed approximately in the shape of a prism and has a flexible elastic area (64) with a projection (65) which, when the button (62) is actuated, with a counter-projection (16) comes into contact and has to overcome this by short-term elastic deformation of the flexible elastic area (64) in order to bring the lock (60) from its release position (60.1) into its locked position (60.2) and back again.

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