Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
  • B26B5/00—Hand knives with one or more detachable blades
  • B26B5/001—Hand knives with one or more detachable blades with blades being slid out of handle immediately prior to use
  • B26B5/003—Hand knives with one or more detachable blades with blades being slid out of handle immediately prior to use comprising retraction means for the blade or the blade holder

Definitions

• the invention relates to a knife according to the preamble of claim 1.
• Such a knife is known from DE 197 23 279 C1
• a blade carrier is slidably mounted in the housing between a retracted into the housing and a displaced forward position. In the pushed forward
• An actuating member has a primary coupling element which is engageable with a secondary coupling element of the blade carrier to engage the
• Blade carrier from the retracted position in the advanced
• the movement of the operating part is limited to the front.
• the blade carrier With regard to this foremost position of the actuating part, the blade carrier is allowed additional relative movement, by means of which the primary and the secondary coupling element can be disengaged.
• the blade carrier can therefore be withdrawn with decreasing cutting force on the blade of a spring element in the housing.
• the principle of the invention is that the knife a
• Blade carrier has, which about a fixed pivot axis between a safety position, an intermediate position and a cutting position is pivotable. By a restoring force of the blade carrier is loaded in the safety position. In the safety position, the blade is inaccessible within the housing. In the intermediate position and the cutting position, the blade protrudes from an opening of the housing.
• Relative movement in the sense of the invention, may mean any kind of movement, such as e.g. Pivoting movement or linear movement.
• the primary blade part is associated with first coupling means, which are releasably engageable with second coupling means, which are associated with the secondary blade part.
• Coupling agents may e.g. be directly or indirectly connected to the primary blade part.
• Coupling agent e.g. be directly or indirectly connected to the secondary blade part.
• An actuator with actuating means e.g. the primary and secondary blade parts are movable by the relative movement of the primary to the secondary blade part between a home position and an operation position.
• the actuator may e.g. be burdened by a restoring force in the home position.
• the first and second clutch means are releasably engageable.
• the first clutch means and the second clutch means engage because the first clutch means are in the path of travel of the second clutch means.
• the blade carrier is also moved in the further movement of the actuator.
• the coupling means are already in the basic position in engagement.
• the blade carrier is moved from the safety position into the intermediate position, for example. In this intermediate position, the blade protrudes from the housing.
• the blade carrier While in the actuation position of the primary and secondary blade parts, e.g. can act to a defined end position, the blade carrier with respect to the intermediate position additional pivotal movement is allowed in the cutting position.
• the additional pivotal movement of the blade carrier into the cutting position may be e.g. be caused by a cutting force.
• the first and second coupling means move out of engagement.
• the primary and secondary blade parts do not necessarily remain in the actuation position.
• a release of the coupling means enabling movement of the primary and the secondary blade part is also conceivable.
• the path of movement of the blade carrier is free to retract to the safety position.
• the blade carrier pivots back into the safety position. For example, if the blade leaves the cut product, when the first and second coupling means are disengaged from each other, the blade carrier can move back to the safety position, although the actuator is in the actuated position.
• the blade housing may be formed by the primary and / or the secondary blade part.
• the axis of rotation of the blade carrier is fixed.
• the axis of rotation may e.g. be stored on the primary blade part or alternatively on the second blade part. According to a further alternative, the axis of rotation can be mounted on both blade parts.
• the advantage of the invention is that the pivotally fixed to the housing mounted blade carrier does not have to be moved over a long length in the housing. Therefore, it is less susceptible to contamination of the housing and possibly arranged therein drive elements. Moreover, between the safety position and the cutting position, no great way, but e.g. only a small swing angle covered. Therefore, the blade carrier can be moved quickly from the safety position to the intermediate position. After a separation of the coupling means, the blade carrier also moves quickly back to the safety position.
• the housing need not have bearing structures for displaceable mounting of the blade carrier in the knife longitudinal direction.
• the housing can therefore be made structurally simpler. Nevertheless, the knife provides full safety function, the blade being automatically withdrawn into the housing when leaving the material to be cut even though the actuator is in the operating position.
• the first coupling means or the second coupling means are associated with the blade carrier.
• the blade carrier is for example mounted on the primary blade part and thus connected to this blade part.
• the first coupling means or the second coupling means are formed by a structure which is fixedly connected to one of the blade parts. The structure may be formed, for example, in one piece with one of the blade parts.
• the first coupling means or the second coupling means are associated with actuating means for actuating the blade carrier.
• the actuating means may e.g. be firmly connected to one of the blade parts or alternatively be movably mounted on at least one of the blade parts.
• the coupling means may be formed by a handlebar.
• the actuating means are associated with a lever with a fixed axis of rotation.
• the lever may e.g. be formed by the primary blade part, which is mounted by means of a fixed axis of rotation at the secondary blade part.
• the lever e.g. the first or the second coupling agent to be connected.
• the lever may e.g. be designed as two-armed lever. In this way it is possible to make the safety knife like a tongs and e.g. to operate a first lever arm by hand.
• a second lever arm of the two-armed lever the coupling means may be assigned. Upon pivoting of the lever, the coupling means engage and cause in this way a pivoting of the blade holder.
• the actuating means comprise at least one handlebar.
• the handlebar may e.g. be slidably mounted in a slot with an end.
• a firm with the handlebar e.g. be slidably mounted in a slot with an end.
• Handlebar connected bolt be guided in the slot.
• the handlebar may e.g. be formed by a rigid rod.
• forces and movements of the transmission parts can be translated.
• the blade carrier can perform a desired movement by means of the gearbox when the primary blade part is moved relative to the secondary blade part.
• the blade carrier can form part of the transmission.
• the transmission is formed by a linkage.
• a first link of the transmission may be formed by the blade carrier.
• a second link may e.g. be connected to the blade carrier and with one of the blade parts.
• the first or the second coupling means may be associated with a link of the steering gear.
• the first or second coupling agents may e.g. at least during the engagement of the first and the second coupling means form a part of the steering gear.
• the first coupling means and / or the second coupling means are formed by at least one spring element.
• a spring element has the advantage that it is elastically deformable. For example, during movement from the safety position to the intermediate position, the spring element may be deformed after the coupling means have engaged. When releasing the coupling means, the spring element can move back to the starting position.
• the first coupling means may be moved out of the path of movement of the second coupling means after being disengaged.
• a spring element due to the elastic deformability of the engagement of the first coupling means remain with the second coupling means even if the first coupling means and the second coupling means move in at least a first specific direction relative to each other.
• the coupling means may, for example, disengage.
• the blade holder is against the force of a spring element from the safety position to the intermediate position and from the intermediate position in the
• Cutting position movable. If the blade carrier is no longer held by the cutting force in the cutting position, it moves automatically due to the restoring force of the spring element in the
• Actuator is moved back to the home position, the blade carrier pivots, caused by the restoring force in the safety position.
• the engaged first coupling means and / or the second coupling means are elastically deformed when moving from the safety to the cutting position against its resilient restoring force and move back to its original position upon release of the coupling means. During the entire movement of the blade holder from the safety to the intermediate position, the coupling means therefore remain engaged.
• the first coupling means and the second coupling means are disengaged so that the first coupling means and / or the second coupling means caused by their resilient restoring force, can move back to the starting position. Due to the return movement into the starting position, the first coupling means are not in the path of movement of the second coupling means, whereby the blade holder can pivot back into the safety position.
• FIG. 1 is a schematic side view of a first embodiment of the safety knife according to the invention in safety position
• FIG. 3 is a side view of the safety knife in an intermediate position, based on FIG. 1,
• FIG. 4 is a schematic sectional view of the safety knife in the intermediate position, based on FIG. 2, FIG.
• FIG. 5 is a side view of the safety knife in a cutting position, with a cutting force holding the blade carrier in the cutting position, on the basis of FIG. 3, FIG.
• FIG. 6 is a schematic sectional view of the safety knife in the cutting position, with a cutting force holding the blade carrier in the cutting position on the basis of FIG. 4, FIG.
• FIG. 7 is a side view of the safety knife in the safety position, with the actuating device in the actuated position, based on FIG. 5, FIG.
• Fig. 8 is a schematic sectional view of the safety knife in the safety position, with the actuating device in the actuated position.
• Fig. 9 is a schematic representation of a second
• FIG. 10 is a schematic representation of the safety knife in the intermediate position, on the basis of FIG. 9,
• FIG. 11 is a schematic representation of the safety knife in the cutting position, and on the basis of FIG.
• Fig. 12 based on Fig. 11 is a schematic representation of the safety knife in the safety position, wherein the actuating device is in the operating position.
• the safety knife as a whole is denoted by the reference numeral 10 in the drawings. As far as differing embodiments are shown below, are analogous to each other
• the safety knife 10 has, according to FIG. 1, a housing 11 and an actuating device 12.
• the actuator 12 is pivotally mounted on the housing 11 about a pivot axis a1 in directions vi and v2.
• the actuating device 12 is tongs-like between a basic position shown in FIG. pivotable in Fig. 3 illustrated actuating position.
• the knife 10 has a spring element 22, which loads the actuating device 12 in the direction v2 the basic position.
• the spring element 22 rests with a spring leg 27 on an inner surface 28 of a receiving space 16 of the housing 11. Another, not shown spring leg of the spring element 22 abuts against the actuator 12.
• the actuating device 12 is designed as a two-armed lever, wherein a lever arm of the handle portion 13 and another lever arm is formed by an actuating portion 17.
• a blade carrier 14 is pivotally mounted on the housing 11 about a pivot axis a2 in directions u1, u2.
• the pivot axis a2 is fixed to the housing.
• a blade 15 is held with a cutting edge S. In the safety position shown, for example, in FIG. 2, the blade 15 is located completely inside the housing 11, so that injury to the user is not possible.
• a beak-like projection 18 is formed on the actuating part 17.
• the projection 18 cooperates with a spring element 19, which is fastened to the blade carrier 14.
• the spring element 19 surrounds an S-shaped two integrally formed on the blade carrier 14 cylinder stumps
• the spring element 19 is fixedly connected to the blade carrier 14. At a free end portion 31 of the spring element 19, a U-shaped bent receiving seat 20 is formed for the projection 18.
• the receiving seat 20 In the safety position shown in FIG. 2, the receiving seat 20 is in the path of movement of the projection 18, but the projection 18 is not in contact with the spring element 19. If the actuating device 12 is pivoted from the basic position according to FIGS. 1 and 2 in the direction vi into the actuating position according to FIGS. 3 and 4, the lug 18 engages in the receiving seat 20 and moves the blade carrier 14 counter to the force of only one schematically a broken line indicated spring element 21 from the safety position in the direction u1 in the intermediate position, which is shown in Figs. 3 and 4. The spring element 19 is thereby deformed against its elastic restoring force.
• the blade carrier 14 is pivoted in the first cutting position by an angle ⁇ .
• the blade 15 exits from an opening 32 of the housing 11.
• the actuating device 12 is pivoted so far against the force of the spring element 22 (only shown in FIG. 2 for the sake of clarity) that a provided on the actuator 12 stop member 23 rests against an outer surface 33 of the handset area 24.
• Actuating position is located.
• a second embodiment is shown in Figs. 9 to 11.
• a primary blade part 11 is pivotally connected to a secondary blade part 12 by means of a pivot joint a1.
• the primary blade part 11 can therefore be moved relative to the secondary blade part 12 from the basic position shown in Fig. 9, e.g. against the restoring force of an elastically deformable element 22 shown only by a dashed line, in the direction w1 in an operating position shown in FIG. 10 movable.
• the pivoting movement from the primary blade part 11 to the secondary blade part 12 may be e.g. be limited by a stop in a manner not shown.
• a blade carrier 14 is pivotally mounted on the secondary blade part 12 by means of a pivot joint a2. On the blade carrier 14 a blade 15 is held. From the safety position shown in FIG. 9, the blade carrier 14 can be moved in the pivoting direction u1 against the restoring force of an elastic element 21 into an intermediate position shown in FIG. From the intermediate position of the blade carrier 14 in the direction u1 in a cutting position shown in Fig. 1 1 is pivotable. In the safety position, the blade 15 is received inaccessible to a user in a receiving space 16 of the knife 10. In the intermediate position and the cutting position, the blade 15 projects through an opening 32 out of the receiving space 16.
• An extension 37 is fixedly connected to the blade carrier 14.
• the extension 37 is connected by means of a pivot joint a3 with a first end portion 41 of a link 35.
• a pin 40 is fixed, which is guided in a slot 39 in the direction of n1, n2 pivotally and in the direction x1, x2 longitudinally displaceable.
• the pin 40 forms with the slot 39 a joint a5.
• Bar 38 mounted by means of a pivot joint a4.
• the rod 38 is releasably engageable with first coupling means in the form of a structure 36.
• the structure 36 is formed on the primary blade part 11.
• Structure 36 disengaged.
• the rod 38 and the structure 36 engage.
• the rod 38 is pivoted relative to the handlebar 35 against the force of an elastic element, not shown, in the direction of p1.
• the arm 35 is pivoted in the direction n2 about the pivot axis a5 during the movement into the intermediate position.
• the pin 40 is moved with the end portion 42 in the slot 39 in the direction x1.
• the blade carrier 14 can now be pivoted from the cutting position shown in FIG. 11 of the elastic member 21 in the safety position, since the rod 38 and the structure 36 are no longer engaged.
• the blade carrier 14 therefore pivots into the safety position as soon as the restoring force of the elastic element is greater than the cutting force acting on the blade 15 by the cutting operation.
• the pin 40 is moved in the slot 39 in the direction x2.
• the handlebar pivots in the direction of n1.

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• Life Sciences & Earth Sciences (AREA)
• Forests & Forestry (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Knives (AREA)

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• 2009
  • 2009-01-31 AU AU2009208188A patent/AU2009208188B2/en not_active Ceased
  • 2009-01-31 EP EP09705539.6A patent/EP2203281B2/fr active Active
  • 2009-01-31 WO PCT/DE2009/000127 patent/WO2009095002A1/fr not_active Ceased
  • 2009-01-31 AT AT09705539T patent/ATE556823T1/de active
  • 2009-01-31 ES ES09705539.6T patent/ES2386523T5/es active Active
  • 2009-01-31 US US12/670,947 patent/US8752297B2/en active Active

Non-Patent Citations (1)

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