EP0687530A1 - Couteau avec lame interchangeable, en particulier pour couper le tapis - Google Patents

Couteau avec lame interchangeable, en particulier pour couper le tapis Download PDF

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Publication number
EP0687530A1
EP0687530A1 EP95104890A EP95104890A EP0687530A1 EP 0687530 A1 EP0687530 A1 EP 0687530A1 EP 95104890 A EP95104890 A EP 95104890A EP 95104890 A EP95104890 A EP 95104890A EP 0687530 A1 EP0687530 A1 EP 0687530A1
Authority
EP
European Patent Office
Prior art keywords
knife
flap
blade
handle body
knife blade
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95104890A
Other languages
German (de)
English (en)
Other versions
EP0687530B1 (fr
Inventor
Heinz-Peter Knoop
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schlipkoter Michael Dr
Original Assignee
Schlipkoter Michael Dr
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schlipkoter Michael Dr filed Critical Schlipkoter Michael Dr
Publication of EP0687530A1 publication Critical patent/EP0687530A1/fr
Application granted granted Critical
Publication of EP0687530B1 publication Critical patent/EP0687530B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the invention relates to a knife, in particular carpeting cutting knives, with a handle body and a blade holder which interchangeably holds therein a knife blade and which is overlapped by a flap which can be pivoted about a pivot axis.
  • the flap is assigned to a blade carrier and, together with it, is movable and spring-loaded in the retracting direction.
  • the flap which can be folded outwards about an articulation axis running transversely to the blade feed direction and parallel to the transverse axis of the handle body, is held in its closed position by means of a resilient locking pin connection.
  • This flap is less suitable for knives with which particularly high cutting pressures and tensile forces have to be transferred to the knife blade via the working hand. This is particularly the case with professional carpet cutting knives for floor installers. Knives of this type require frequent blade changes because of the relatively resistant material to be cut. For this reason, this group of users is demanding a knife in which the blade change can be carried out as quickly as possible, in an ergonomically more favorable manner and also in a manner which reliably prevents cuts.
  • DE-GM 69 48 045 discloses a non-generic, ergonomically unfavorably designed knife of small thickness, which essentially consists of a base plate made of steel strip and a cover plate which is connected to the base plate via two rivet pins with little play. A knife blade is clamped between this cover plate and the lower plate.
  • a two-armed lever is articulated on the lower plate, which has a chamfer on its shorter lever arm, which engages in a wedge shape in the space between the cover plate and the lower plate, whereby the knife blade is clamped between the lower plate and the cover plate in the closed position of the lever.
  • this knife Because of its ergonomically unfavorable shape, this knife has the disadvantage that its knife blade near the rivet pins tends to tilt or tilt when large lateral forces are exerted, such as can occur with a carpet cutting insert, since non-positive clamping only in the narrow tangential areas of the front edges of the cover plate and lower plate.
  • a knife of another type in which the knife blade (scalpel-like deburring blade) is arranged between a recess in the handle body and a handle part which can be swiveled by 90 ° about an axle bolt and which is parallel to the plane of the knife blade extending plane is arranged.
  • the knife blade is held by an eccentric with self-locking, which is arranged near the axle bolt in the swiveling handle part.
  • the grip part can be pivoted about an axis bolt running perpendicular to the plane of the knife blade in approximately the plane of the knife blade.
  • This embodiment has a relatively small clamping surface on the knife blade, which prevents the knife blade from being cut with high pressure and tensile forces, as is customary with a carpet knife.
  • either the other hand of the operator or a multiple grasping with the thumb or a finger of the working hand is required to open and pivot the handle part in the direction of the tip of the knife blade.
  • a knife of another type which does not have a flap, but in which the handle body is formed from two half-shells which are held together by a film hinge on one longitudinal edge and on the other longitudinal edge by means of locking knobs and locking grooves can be clipped together and hold a knife blade in their blade holder after this closing process.
  • the film hinge tends to tear and the locking knobs naturally loosen from their locking grooves.
  • the invention has for its object to provide a knife for particularly heavy professional cutting work, in particular a carpet cutting knife, which ensures a quick blade change in an ergonomically favorable manner and thereby safely avoids cutting injuries.
  • the pivot axis of the cutting edge is adjacent to the knife blade and its longitudinal axis of symmetry is arranged approximately in the cutting direction, the flap being lockable in its closed position by a pivot bolt adjacent to the back of the knife blade.
  • the knife blade can then be quickly removed with the other hand by the operator and replaced with a new one before the thumb of the working hand pivots the flap into its covering position about the pivot axis and then by pushing the thumb or a finger the pivot bar into its flap locking position shifts.
  • opening and closing the knife only takes a period of time from one to two seconds. At this time, the period for replacing the old with a new knife blade must be added. Since the knife blade is completely exposed when the flap is open, the knife blade can be changed just as quickly and without cuts.
  • the flap and the pivot bolt can be locked in their closed position under the action of inherently elastic, leaf spring-like forces. Due to this positive and form-locking self-locking effect, the blade is held securely in this locking position even with strong transverse forces applied perpendicular to its blade plane.
  • the swivel bolt can be pivoted about an axis of rotation which is attached to one of its ends and runs transversely to the plane of the knife blade and is advantageously arranged at its end facing away from the knife blade.
  • the swivel bolt has on its side facing the handle body a wart-shaped projection which, in the closed position of the flap, is assigned to an edge of a recess provided in it as a sash.
  • the flap and the pivot bolt are supported not only by their inherently elastic, leaf spring-like spring or by an additional spring, but also by the clamping force of the sash acting in a plane perpendicular thereto in the form of a wart-like projection in connection with an edge of the flap.
  • the pivot axis of the flap consists of projecting, integrally connected to it with eyelets and projecting eyelets of the handle body, which mutually engage in the recesses between the eyelets and either through a jointly penetrating thru axle or by positive and non-positive Clip together male-like projections in female-like recesses are pivotally connected to each other.
  • the flap covers not only the blade holder, but also a magazine space which is remote from it and is arranged in the handle body.
  • This magazine space advantageously has a raised support edge on a longitudinal side of the reserve knife blades arranged in it, which edge keeps it in a favorable inclined position. This allows the knife blades to be ergonomic conveniently removed from the magazine room and inserted into the blade holder.
  • the side view of the handle body is provided with a circular arc shape on its top side facing the back of the knife and on its underside behind the pivot axis of the flap with two undulating indentations and with an undulating elevation located between them, which continuously, e.g. sinusoidal, merge.
  • the width of an indentation corresponds approximately to the thickness of the middle index finger and the width of the rear indentation corresponds at least to the thickness of a little finger of a male person.
  • the thickness of the handle body between the end facing away from the knife blade and the support of the thumb of the operating hand is approximately the same width, whereas the thickness of the handle body then tapers from the thumb support in the direction of the knife blade tip.
  • This shape is known in principle from a different type of knife from DE 33 09 342 C1.
  • the knife 10 has a handle body 11 and a knife blade 12, which is held interchangeably in a blade holder 13.
  • the blade holder 13 is overlapped by a flap 15 that can be swiveled about a pivot axis 14 so that it can be closed.
  • the pivot axis 14 is adjacent to the cutting edge 12a of the knife blade 12 and its longitudinal axis 16 of symmetry is arranged approximately in the cutting direction according to the arrow x, the flap 15 in its closed position shown in FIGS. 1 and 2 from a pivot bolt adjacent to the back 12b of the knife blade 12 17 is locked.
  • the pivot bolt 17 can be pivoted about an axis of rotation 18 arranged at its end 17a and extending transversely to the plane of the knife blade 12, in the example shown perpendicular to the plane of the drawing.
  • the axis of rotation 18 could, although not ergonomically so favorable, be arranged at the other end 17b (here: free end 17b) of the pivot bolt 17.
  • a further reinforcement of these inherently elastic forces can also be achieved in that the pivot bolt 17 accordingly with leaf spring-like, elastic forces when pivoting in the direction of the arrow 19 of FIG. 3 in its closed position also presses against the side surface of the flap 15 facing it.
  • the flap 15 and the pivot bolt 17 act as leaf springs in opposite pressure directions transverse to the plane of the knife blade 12.
  • the invention also allows the flap 15 and the pivot bolt 17 in their closed position under the action of a spring acting on the flap 15 in the opening direction according to FIG. 3 in the form of a spiral spring, not shown, a cylindrical or conical coil spring or a leaf spring can be locked.
  • the swivel bolt 17 is provided on its lower surface facing the handle body 11 with a wart-like projection 20 which, in the closed position according to FIGS. 1 and 2, has an edge 15a of the flap 15 of a recess 21 arranged in the flap 15 (see Fig. 1) is assigned as a sash.
  • the wart-shaped projection 20 with its sliding edge 20a presses against the edge 15a of the flap 15, as a result of which a cantilever force is exerted on the edge 15a of the flap 15 approximately in the direction of the arrow y.
  • the recess 21 here represents a recess-like reduction in the thickness of a projection V of the flap 15 pointing toward the top 11a of the handle body 11.
  • the pivot axis 14 of the flap 15 consists of projecting, cohesively connected to it 22 and from projecting and likewise cohesively connected to the handle body 23, which engage each other in the recesses 24 between the eyelets 22, 23 and either by a jointly penetrating thru axle 25 or by positive and non-positive clipping together are pivotable.
  • one part of the eyelets is provided with matrix-like, for example dome-like recesses and the other part with male-like projections.
  • the flap 15 covers not only the blade receptacle 13 but also a magazine space 26 which is remote from the latter and is arranged in the handle body 11. Reserve blades, not shown, are stored in the magazine room 26.
  • a support edge 26c which is raised in relation to the inner surface 26b, is arranged on one long side, here 26a, of the magazine space 26. Because they rest with an edge on this support edge 26c, the reserve blades are held in an inclined position, which allows them to be removed quickly and avoid cuts.
  • the handle body 11 is in a side view on its top 11a facing the back of the knife 12b in adaptation to the palm 36 with a circular arc shape and on its underside 11b behind the pivot axis 14 of FIG Flap 15 is provided with two undulating indentations 27, 28 and an undulating elevation 29 located between them, which merge into one another continuously, approximately sinusoidally.
  • the width of the front indentation 27 corresponds approximately to the thickness of the index finger 34 and the rear indentation 28 corresponds at least to the thickness of a little finger 35 of the working hand 33 of a male person.
  • the thickness of the handle body 11 between the end 30 facing away from the knife blade 12 and the area 31 adjacent to the free end 17b of the swivel lock 17 is approximately the same width, whereas the width of the handle body 11 tapers from the area 31 to the knife tip 12d.
  • the flap 15 is opened in a flash in that the thumb 32 of the operating hand 33 pivots the swivel bolt 17 upward in the direction of the arrow 19 and immediately after pivoting with the thumb side surface grips the narrow upper edge 15b of the flap 15 in a frictional manner and with one perpendicular to the plane of the drawing extending pivoting movement of the thumb 32 in the position shown in FIG. 3 folds down.
  • the knife blade 12 which is thereby completely exposed can then quickly be grasped by the other hand of the operator and lifted out of the blade holder 13 and replaced by a new one.
  • the thumb 32 pivots the flap 15 with a sideways movement of the thumb 32 in the direction of the corresponding contact surface on the handle body 11 and pushes it in the next moment the swivel bolt 17 with the tip of the thumb 32 into the locking position according to FIGS. 1 and 2.
  • the thumb 32 assumes its working position by pivoting downward from its position according to FIG. 2 (when the locking bolt 17 has been locked) in a manner not shown, overlapping the pivot bolt 17 and flap 15 and finally adjacent to the underside of the handle on the index finger 34 comes to the plant.
  • the blade change can be not only extremely quick, but also ergonomically cheaper and avoid cuts.

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Knives (AREA)
EP95104890A 1994-06-17 1995-04-01 Couteau avec lame interchangeable, en particulier pour couper le tapis Expired - Lifetime EP0687530B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4421351A DE4421351C1 (de) 1994-06-17 1994-06-17 Messer, insbesondere Teppichboden-Schneidmesser, mit auswechselbarer Messerklinge
DE4421351 1994-06-17

Publications (2)

Publication Number Publication Date
EP0687530A1 true EP0687530A1 (fr) 1995-12-20
EP0687530B1 EP0687530B1 (fr) 1997-01-15

Family

ID=6520916

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95104890A Expired - Lifetime EP0687530B1 (fr) 1994-06-17 1995-04-01 Couteau avec lame interchangeable, en particulier pour couper le tapis

Country Status (3)

Country Link
EP (1) EP0687530B1 (fr)
DE (2) DE4421351C1 (fr)
ES (1) ES2098982T3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19600447C1 (de) * 1996-01-09 1996-08-22 Schlipkoeter Michael Dr Messer mit einer Wechselklinge
DE19749254A1 (de) * 1997-11-07 1999-05-12 Wolfcraft Gmbh Messer, insbesondere Teppichmesser
DE19959874C1 (de) * 1999-12-10 2001-08-16 Beermann Kg Martor Argentax Messer

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3520059A (en) * 1967-10-05 1970-07-14 Allway Tools Knife handle for adjustable blade
GB1446958A (en) * 1974-06-08 1976-08-18 Plas Plugs Ltd Holders for use in hand tools
US4612707A (en) * 1984-03-29 1986-09-23 Shea Thomas M Cutting and scraping device
DE3622343C2 (fr) * 1986-07-03 1989-01-19 Martor-Argentax E. H. Beermann Kg, 5650 Solingen, De

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6920468U (de) * 1969-05-21 1969-11-27 Guenter Schreiber Universalmesser
DE6948045U (de) * 1969-12-08 1970-03-19 Hans Karl Middeldorf Mit einer auswechselbaren, blattfoermigen klinge versehenes werkzeug
DE3309342C1 (de) * 1982-03-16 1984-03-01 Martor-Argentax E.H. Beermann Kg, 5650 Solingen Werkzeuggriff für eine darin längsverschiebliche Messerklinge
DE9310886U1 (de) * 1993-07-21 1993-09-02 Martor-Argentax E. H. Beermann KG, 42653 Solingen Messer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3520059A (en) * 1967-10-05 1970-07-14 Allway Tools Knife handle for adjustable blade
GB1446958A (en) * 1974-06-08 1976-08-18 Plas Plugs Ltd Holders for use in hand tools
US4612707A (en) * 1984-03-29 1986-09-23 Shea Thomas M Cutting and scraping device
DE3622343C2 (fr) * 1986-07-03 1989-01-19 Martor-Argentax E. H. Beermann Kg, 5650 Solingen, De

Also Published As

Publication number Publication date
DE59500090D1 (de) 1997-02-27
EP0687530B1 (fr) 1997-01-15
ES2098982T3 (es) 1997-05-01
DE4421351C1 (de) 1995-02-02

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