EP3766648A1 - Safety knife - Google Patents

Abstract

The invention relates to a knife for receiving an exchangeable blade (12), with a housing (1, 2) which has a blade channel (3) for inserting a blade (12) with a driver recess, with a blade along the housing (1, 2) ) from the outside of the housing along a movement path slider (7) to move the blade (12) from a storage position in the blade channel (3) into a working position protruding from an opening in the blade channel (3), which is used for coupling the slider ( 7) with the blade (12) carries a coupling element (4) with a driver projection (5) which engages in the driver recess, and with a blade change button (16). For a further development that is advantageous in terms of use, the invention proposes that the blade change button (16) has a blocking section (17) which protrudes into the path of movement of the slide (7) and which the slide (7) strikes in the final phase of its displacement into the working position and which through an actuation of the blade change button (16) can be brought out of the path of movement of the slide (7), so that the slide (7) can bring the blade (12) beyond the working position into a blade change position, the driver projection (5) from the driver recess is controlled.

Description

Field of technology

The invention relates to a knife for receiving an exchangeable blade, with a housing which has a blade channel for inserting a blade having a driver recess, with a slide which is displaceable along a movement path along the housing from the outside of the housing, in order to prevent the blade from being pushed in the blade channel To move the storage position into a working position protruding from an opening of the blade channel, which carries a coupling element for coupling the slide to the blade with a driver projection that engages in the driver recess, and with a blade change button.

State of the art

The US 2009/0277016 A1 describes a knife with a blade carried by a slide, the slide being displaceable by means of a handle in the housing of the knife. A blade change button which has a blocking section protruding into a movement path of the slide must be actuated in order to bring the slide beyond a working position into a blade change position.

The DE 20 2005 016 202 U1 also describes a knife which has a slide which carries a blade and which can be brought from a storage position into a working position. A pivot lever has a blocking section against which the slide strikes in the working position. By pivoting the pivot lever, the blocking section gets out of the path of movement so that the slide can be brought into a blade change position.

A similarly designed knife with a blocking section formed by a pivot lever describes the DE 20 2011 050 068 U1 .

A knife with a side push button is out of the DE 20 2013 101 416 U1 previously known.

A knife with a pivot lever is from the DE 202 02 165 U1 previously known.

Otherwise, knives with a blade which can be brought from a storage position into a working position by actuating a slide and in which a used blade can be replaced by a new blade are known from US Pat GB 2 213 416 B , CN 105171781 A , U.S. 5,581,890 A , WO 2016/201532 , DE 21 2011 100 211 U1 , DE 27 36 395 B1 , DE 72 07 013 , EP 3 165 337 A1 , GB 2 428 618 B , CN 206105907 , CN 204976674 , DE 19717 830 A1 and GB 2 265 104 .

Summary of the invention

The invention is based on the object of developing a knife of the generic type in an advantageous manner.

The object is achieved by the invention specified in the claims.

A first aspect of the invention relates to the blade change button. This is designed in particular as a push button. It can have a blocking section protruding into the path of movement of the slide. The slide is designed in such a way that it is in an end phase when it is moved from the Storage position strikes in the working position on the blocking section. The blocking section can be brought out of the path of movement of the slide by pressing the blade change button in such a way that after the blade change button has been operated, the slide can be displaced beyond the working position described above. In this position the knife assumes a blade change position. A driver projection is provided which rests in a driver recess of the blade both in the storage position and in the working position. The blade is tied to a blade carrier by means of this driver projection. In the blade change position, the driver projection emerges from the driver recess, so that the blade can be pulled out of the blade channel and replaced with a new blade. The driver projection is assigned to a coupling element which is seated again on the blade carrier or a blade carrier arrangement. The blade carrier or the blade carrier arrangement is connected to the slide. In a development of the invention it is provided that the coupling element has a control element. When the slide is moved from the working position to the blade change position, this control element can step against a control flank fixed to the housing, for example a control slope or control cam, in order to bring the coupling element from a coupled position to a decoupled position. Another aspect of the invention relates to the design of the coupling element. The coupling element can be designed as a flexurally elastic body. When moving the slide from the working position into the blade change position, the flexible body can bend transversely to the direction of displacement of the slide. The flexurally elastic body can be formed from a resilient sheet metal, for example a leaf spring. But it is also possible that the coupling element is a rigid body. The rigid body can be pivotably attached, for example, to a blade carrier or to a coupling element carrier. In a variant of the invention it is proposed that the coupling element, the control flank or the Control element from a strip of material, for example a spring tongue. In particular, it can be provided that the spring tongue is a section of the resilient sheet metal of the same material. It can be a material strip that has been bent back, in particular bent back in a U-shape. The control flank on the housing side can be formed by the projection or the like of the housing, the housing preferably being formed by two housing halves. In a further development of the invention it can be provided that the slide sits like a rider on a narrow side of the housing. It can have legs extending over the two broad sides. In its blocking position, the blocking section can lie in the path of movement of one of these legs. If the blade change button, which is also preferably assigned to the broad side of the housing, is actuated against the restoring force of a spring element, the blocking section emerges from the movement path of the leg of the slide. In particular, it is provided that the blocking section is displaced in the direction of the housing. It can then be overrun by the leg of the slide. The spring element can be a reversing gear compression spring. It can be supported on a U-shaped spring holder that sits inside the housing and is fastened with its U-legs to the inside of one of the housing halves. The spring element can be supported on the U-bar. The coupling element can be a stamped and bent part. The driver projection can be an angled section of the coupling element. The control element can also be a section that is connected to the coupling element in the same material. In a further development of the invention it is proposed that the slide forms an actuating section arranged between its legs. A blade carrier can be connected to this operating section. The blade carrier protrudes through a housing slot into the blade channel. The housing slot can be provided at the interface between the two housing halves. The blade carrier can form a contact flank on which a broad side of the blade can be supported. The blade carrier can also form a support shoulder on which a rear edge of the blade can be supported. In addition, the blade carrier can also have a retaining tongue on which the cutting edge of the blade can be supported. Furthermore, a spring element can be provided which has a first end which is attached to the slide or to the blade carrier. A second end of the spring element can be attached to the housing. The spring element is preferably a tension spring which automatically pulls the slide back into the storage position. Latching elements can be provided with which the slide latches in a working position. However, it can also be provided that no latching means are provided, so that the slide must be deliberately held in the working position. In a variant of the invention it can be provided that the blade carrier is spatially assigned a holding flank opposite the contact flank. The blade can be arranged on a first broad side of the blade carrier. The coupling element can be arranged on one of these opposite second broad side surfaces of the blade carrier. In a further development of the invention it is provided that the holding flank for holding the coupling element is formed by a coupling element carrier which is arranged directly on the blade carrier. Blade carrier, coupling element carrier and slide can form a functional unit. Both the blade carrier and the coupling element carrier can have holding sections, for example right-angled bends, which can be inserted into an insertion shaft of the slide. In the joined state, in which a broad side surface of the coupling element carrier rests against a broad side surface of the blade carrier, the two holding sections form a T-profile which is inserted into an insertion slot having a T-shaped cross section.

A particularly preferred solution to the above-mentioned object is that the control flank of the coupling element is U-shaped bent back metal strip is formed. Another, likewise particularly preferred solution to the problem is that a restraint section of the coupling element stands in an insertion shaft which is formed by a plurality of ribs which protrude at a small distance over a base surface of a retaining flank of the coupling element carrier. Another, also preferred solution to the problem is that the blade change button is to be actuated against the restoring force of a reversing gear pressure spring, which is supported on a U-shaped spring holder, which is fastened with its U-legs on the inside of the housing.

The operation of the device is as follows. In the non-actuated state, the slide is held in its retracted position. In this position the blade is in its storage position. If the slide is moved against the restoring force of the spring element, the blade emerges from the mouth of the blade channel into its working position. The slide can be displaced until it hits the blocking section. In this position, the control element lies in front of a control slope or a control curve of the housing. The blade is tied to the blade carrier by means of the driving projection which enters the driving recess of the blade. The coupling element, in particular designed as a flat body, extends in one plane and lies flat against a holding flank of a coupling element carrier. If the blade change button is pressed, the slide can be pushed beyond the working position to a blade change position. The control element of the coupling element steps against the control slope or control curve of the blade channel. This has the consequence that the driver projection is displaced out of the driver recess in a direction transverse to the direction of displacement of the slide. This transverse displacement is caused by the control element sliding onto the control slope or control curve of the blade channel. In the exemplary embodiment, the control element is a leaf spring-like body that is resilient can dodge. During the displacement, in which the driver projection emerges from the driver recess, the coupling element is elastically pretensioned. When the slide is displaced back from the blade change position into the working position, for example, the coupling element springs back into the initial position in which the driver projection engages the driver recess.

An end section of the coupling element remote from the driver projection forms a restraint section which is immovably bound to the coupling element carrier. The restraint section can be inserted in an insertion shaft.

Brief description of the drawings

Fig. 1

eine erste perspektivische Darstellung des Ausführungsbeispiels in einer Arbeitsstellung,

Fig. 2

eine zweite perspektivische Darstellung ebenfalls in der Arbeitsstellung,

Fig. 3

eine Ansicht in einer Verwahrstellung,

Fig. 4

eine Ansicht gemäß der Linie IV in Figur 3

Fig. 5

den Schnitt gemäß der Linie V-V in Figur 4,

Fig. 6

eine Ansicht gemäß Figur 3 jedoch in der Arbeitsstellung,

Fig. 7

eine Darstellung gemäß Figur 5 jedoch in der Arbeitsstellung,

Fig. 8

eine Darstellung gemäß Figur 6, jedoch in der Klingenwechselstellung,

Fig. 9

eine Darstellung gemäß Figur 7 jedoch in der Klingenwechselstellung,

Fig. 10

eine Explosionsdarstellung der Elemente des Messers,

Fig. 11

vergrößert einen Kupplungselement-Träger 26 mit Kupplungselement 4,

Fig. 12

eine Darstellung in Blickrichtung XII in Figur 11,

Fig. 12a

eine Darstellung in Blickrichtung XIIa in Figur 11

Fig. 13

eine weitere Explosionsdarstellung,

Fig. 14

einen Schnitt gemäß der Linie XIV-XIV in Figur 6,

Fig. 15

einen Schnitt gemäß der Linie XV-XV in Figur 14,

Fig. 16

einen Schnitt gemäß der Linie XVI-XVI in Figur 8,

Fig. 17

einen Schnitt gemäß der Linie XVII-XVII in Figur 16.

Embodiments of the invention are explained below with reference to the accompanying drawings. Show it:

Fig. 1

a first perspective illustration of the embodiment in a working position,

Fig. 2

a second perspective view also in the working position,

Fig. 3

a view in a custody,

Fig. 4

a view according to the line IV in Figure 3

Fig. 5

the section along the line VV in Figure 4 ,

Fig. 6

a view according to Figure 3 but in the working position,

Fig. 7

a representation according to Figure 5 but in the working position,

Fig. 8

a representation according to Figure 6 , but in the blade change position,

Fig. 9

a representation according to Figure 7 but in the blade change position,

Fig. 10

an exploded view of the elements of the knife,

Fig. 11

enlarges a coupling element carrier 26 with coupling element 4,

Fig. 12

a representation in viewing direction XII in Figure 11 ,

Figure 12a

a representation in the viewing direction XIIa in Figure 11

Fig. 13

another exploded view,

Fig. 14

a section along the line XIV-XIV in Figure 6 ,

Fig. 15

a section along the line XV-XV in Figure 14 ,

Fig. 16

a section along the line XVI-XVI in Figure 8 ,

Fig. 17

a section along the line XVII-XVII in Figure 16 .

Description of the embodiments

The knife shown in the drawings has a handle which forms a housing. The housing is formed by 2 housing halves 1, 2 of similar design. The housing halves 1, 2 can be made of plastic, aluminum, die-cast zinc or another suitable material. With ribs facing one another, they form a blade channel 3 in which a blade 12 can be pushed back and forth.

A slide 7 rides on a narrow side of the housing 1, 2. The slide 7 has two parallel legs 9, 9 'of different thicknesses, which are connected to one another by an actuating section 9'". On its side pointing into the U-space The actuating section has an indentation undercut on both sides. This indentation forms an insertion slot 28 for holding sections 29 of a blade carrier 10 and a coupling element carrier 26. The blade carrier 10 has a broad side surface which forms a contact flank 15 on which a broad side surface of a trapezoidal blade 12 is supported A rear edge 12 ″ of the blade 12 can be supported on a support shoulder 22 of the blade carrier 10. The back of a coupling element carrier 26 rests on a back of the blade carrier 10. If the blade carrier 10 and the coupling element carrier 26 are back to back, they form a T-profile with the holding sections 29. On the side of the blade carrier arrangement facing away from the contact edge 15, which is formed by the blade carrier 10 and the coupling element carrier 26, there is a retaining edge 21 that merges into an insertion shaft 25 for inserting a restraint section 24 of the coupling element 4. The insertion shaft 25 is formed by a plurality of ribs 31 which protrude over the base surface of the holding flank 21 at a small distance. That in the Figure 11 The coupling element 4 shown, formed by a metal strip, can be inserted into the insertion shaft 25 with its restraint section 24. In In this state, a broad side surface of the coupling element 4 lies flat against the retaining flank 21. (please refer Figures 12 , 12a , 15th and 17th )

The coupling element 4 is a resilient body which is lifted off the retaining flank 21 by a transverse force. In this case, a section of the coupling element 4 forming a driver projection 5 bends in relation to the positionally constrained restraint section 24. Opposite incisions 27 adjoin the restraint section 24. (please refer Figure 17 The incisions 27 are level with an upper rib 31, so that the rib can enter the incisions 27 when the coupling element 4 is bent, in order to prevent the coupling element 4 from slipping out of the insertion shaft 25.

The blade support assembly has hook portions on its rear side. In the exemplary embodiment, both the blade carrier 10 and the coupling element carrier 26 each have a hook section. The end of a spring element 18 is attached to this hook section. In the exemplary embodiment, the spring element 18 is a tension spring. The other end of the spring element 18 is attached to the housing in such a way that a spring force is exerted on the blade carrier arrangement. In the exemplary embodiment, there is a tensile force that the slide of the in the Figure 7 working position shown in the, in the Figure 5 depicted safekeeping applied.

An angle of the coupling element 4 forms a driver projection 5 which engages in a driver recess 23 of the blade 12. As a result, the blade 12 is tied to the blade support arrangement and can by moving the slide from a storage position in which the front Edge 12 'of the blade 12 lies within the blade channel 3, can be moved into a working position in which the front edge 12' protrudes from the housing 1, 2.

A U-shaped spring holder 19 is attached to the housing half 1 on the inside facing the blade channel 3. The spring holder 19 carries a spring element 20 designed as a compression spring, which acts on a blade change button 16 in the outward direction of the housing. An actuating section of the blade change button 16 protrudes through an opening 32 of the housing shell 1. The blade change button 16 forms a blocking section 17 which has emerged through an associated opening 33 in a non-actuated position of the blade change button 16 from the interior of the housing. It lies in the path of movement of the leg 9 of the slide 7, so that the slide 7 only extends into the Figure 14 working position shown can be shifted. If the blade change button 16 is pushed into the in Figure 16 brought displaced position, the blocking section 17 steps out of the path of movement of the leg 9, so that the leg 9 beyond the working position into the in Figure 16 Blade change position shown can be brought. In the exemplary embodiment, the blocking section enters a niche 34 of the leg 9.

The Figures 11 and 12 show a coupling element 4 according to the invention which forms a control element 6. The control element 6 forms a control flank 6 '. In the exemplary embodiment, the control element 6 is formed by an elongated strip which is connected to the coupling element 4 in the same material and is bent back to form a U in such a way that it is in the Figure 14 working position shown in front of a control shoulder 14 is. The control shoulder 14, which can also be designed as a control cam or as a control slope, forms a run-up flank against which the Control edge 6 'of the control element 6 can occur. In the in Figure 14 Touching the control flank 6 'of the control shoulder 14 does not yet have any functional consequence. Only when the blade change button 16 has been brought into the position shown in Figure 16 and the slide 7 has been pushed into the blade change position shown there does the control flank 6 'of the control element 6 slide along the control shoulder 14 so that the coupling element 4 is in a direction transverse to the direction of displacement of the slide 7 bends. The entrainment projection 5 emerges from the entrainment recess 23. This then has the consequence that the blade 12 can be pulled out of the blade shaft 3 and replaced with a new blade. If the slide 7 is then moved back again, the coupling element 4, which is tensioned during its deformation, relaxes back into the position shown in FIG Figure 14 The position shown, in which the driving projection 5 engages in the driving recess 23 in order to tie the blade 12 to the blade carrier arrangement 10, 26.

The above explanations serve to explain the inventions covered by the application as a whole, which at least further develop the state of the art at least through the following combinations of features, whereby two, more or all of these combinations of features can also be combined, namely:

A knife, which is characterized in that the blade change button 16 has a blocking section 17 protruding into the path of movement of the slide 7, against which the slide 7 strikes in the final phase of its displacement into the working position, and which is moved out of the path of movement by actuation of the blade change button 16 of the slide 7 can be brought, so that the slide 7 can bring the blade 12 beyond the working position into a blade change position, the driver projection 5 being controlled from the driver recess.

A knife which is characterized in that the coupling element 4 has a control element 6 which interacts with a control flank 6 'of the blade channel when the slide 7 is displaced from the working position into the blade change position.

A knife which is characterized in that the coupling element 4 is a flexurally elastic body which bends when the slide 7 is moved from the working position to the blade change position transversely to the direction of displacement and is in particular a resilient sheet metal.

A knife which is characterized in that the control flank 6 'is formed by a spring tongue of the coupling element 4, which is in particular bent back and which occurs against the control flank 6', in particular the control slope.

A knife, which is characterized in that the slide 7 is rider-like on a narrow side of the housing 1, 2 and has legs extending over the two broad sides, the blocking section 17 in its blocking position in the movement path of one of the legs 9, 9 ' and / or that the blade change button 16 is arranged on the broad side of the housing 1, 2 and is to be actuated against the restoring force of a spring element 20 in order to enable the displacement of the slide 7 into the blade change position, it being provided in particular that the one from a The spring element 20 formed by a reversing gear compression spring is supported on a U-shaped spring holder 19.

A knife which is characterized in that the driver projection 5 and the control element 6 are connected to the coupling element 4 designed as an elastic flat body as a single material, with provision in particular that the control element 6 is a section angled from the flat body.

A knife which is characterized in that a blade carrier 10 connected to an actuating section 9 '"of the slide 7 protrudes through a housing slot into the blade channel 3 and forms a contact flank 15 on which a broad side of the blade 12 can be supported and / or that a first end of a spring element 18 engages the blade carrier 10, the second end of which engages the housing 1, 2, which spring element 18 is in particular a tension spring or a compression spring.

A knife, which is characterized in that the blade carrier 10 is spatially assigned a holding flank 21 which lies opposite the contact flank 15 and to which the coupling element 4 is attached.

A knife, which is characterized in that a shackling section 24 of the coupling element 4, which is removed from the driving projection 5, is inserted in an insertion shaft 25, in particular of a coupling element carrier 26.

All of the features disclosed are essential to the invention (individually, but also in combination with one another). The disclosure of the application hereby also fully includes the disclosure content of the associated / attached priority documents (copy of the previous application), also for the purpose of including features of these documents in the claims of the present application. The subclaims characterize, even without the features of a referenced claim, with their features independent inventive developments of the prior art, in particular to make divisional applications on the basis of these claims. The invention specified in each claim can additionally have one or more of the features provided in the above description, in particular provided with reference numbers and / or specified in the list of reference numbers. The invention also relates to design forms in which some of the features mentioned in the above description are not implemented, in particular if they are recognizable for the respective purpose or can be replaced by other technically equivalent means. <b><u> List of reference symbols </u></b> 1 Housing halves 24 Bondage section 2 Housing halves 25th Slot 3 Blade channel 26th Coupling element carrier 4th Coupling element 27 incision 5 Driver projection 28 Slot 6th Control 29 Holding section 6 ' Control edge 30th Holding tongue 7th Slider 31 rib 8th Actuation axis 32 opening 9 leg 33 opening 9 ' leg 34 niche 9 " Operating section 10 Blade carrier 11 Support section 12 blade 12 ' front edge 12 " rear edge 14th Control shoulder 15th Contact edge 16 Blade change button 17th Blocking section 18th Tension spring 19th Penholder 20th Spring element 21st Holding flank 22nd Support shoulder 23 Driver recess

Claims (15)

Knife for receiving a replaceable blade (12), with a housing (1, 2) which has a blade channel (3) for inserting a blade (12) having a driver recess, with a blade (12) along the housing (1, 2) from the outside of the housing slide (7), which can be moved along a path of movement, in order to move the blade (12) from a storage position in the blade channel (3) into a working position protruding from an opening in the blade channel (3), which is used to couple the slide (7) to the Blade (12) carries a coupling element (4) with a driver projection (5) which engages in the driver recess, and with a blade change button (16), characterized in that the blade change button (16) protrudes into the path of movement of the slide (7) Has blocking section (17) on which the slide (7) strikes in the final phase of its displacement into the working position, and which is out of motion by actuation of the blade change button (16) gsbahn of the slide (7) can be brought, so that the slide (7) can bring the blade (12) beyond the working position into a blade change position, the driver projection (5) being controlled from the driver recess. Knife according to Claim 1, characterized in that the control flank (6 ') of the coupling element (4) is formed by a metal strip bent back in a U-shape. Knife according to Claim 1 or 2, characterized in that a shackling section (24) of the coupling element (4) is inserted in an insertion shaft (25) which is formed by several ribs (31) which are spaced a small distance from a base surface of a retaining flank ( 21) of the coupling element carrier (26) protrude. Knife according to claim 1, 2 or 3, characterized in that the blade change button (16) is to be actuated against the restoring force of a reversing gear pressure spring (20) which is supported on a U-shaped spring holder (19) which is attached with its U-legs the inside of the housing (1, 2) is attached. Knife according to one of the preceding claims, characterized in that the coupling element (4) has a control element (6) which interacts with a control flank (6 ') of the blade channel when the slide (7) is moved from the working position to the blade change position. Knife according to one of the preceding claims, characterized in that the coupling element (4) is a flexurally elastic body which bends when the slide (7) is moved from the working position to the blade change position transversely to the displacement direction and is in particular a resilient sheet metal. Knife according to one of the preceding claims, characterized in that the control flank (6 ') is formed by a spring tongue of the coupling element (4) which is in particular bent back and which occurs against the control flank (6'), in particular the control slope. Knife according to one of the preceding claims, characterized in that the slide (7) is rider-like on a narrow side of the housing (1, 2) and has legs extending over the two broad sides, the blocking section (17) in its blocking position in the movement path one of the legs (9, 9 ') lies. Knife according to one of the preceding claims, characterized in that the blade change button (16) is arranged on the broad side of the housing (1, 2) and is to be actuated against the restoring force of a spring element (20) in order to move the slide (7) in to enable the blade change position, and / or that the spring element (20) formed by a reversible pressure spring is supported on a U-shaped spring holder (19). Knife according to one of the preceding claims, characterized in that the driver projection (5) and the control element (6) are connected in the same material with the coupling element (4) designed as an elastic flat body, it being provided in particular that the control element (6) is one from the flat body angled section is. Knife according to one of the preceding claims, characterized in that a blade carrier (10) connected to an actuating section (9 ''') of the slide (7) projects through a housing slot into the blade channel (3) and forms a contact flank (15) on which one broad side of the blade (12) can be supported. Knife according to one of the preceding claims, characterized in that a first end of a spring element (18) engages the blade carrier (10), the second end of which engages the housing (1, 2), which spring element (18) is in particular a tension spring or a compression spring . Knife according to one of the preceding claims, characterized in that the blade carrier (10) is spatially assigned a retaining flank (21) which lies opposite the contact flank (15) and to which the coupling element (4) is attached. Knife according to one of the preceding claims, characterized in that a tethering section (24) of the coupling element (4) removed from the driving projection (5) is inserted in an insertion shaft (25), in particular a coupling element carrier (26). Knife, characterized by one or more of the characterizing features of one of the preceding claims.

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