EP0549847B1 - Messer mit einer längsverschieblich geführten Messerklingenhalterung - Google Patents

Messer mit einer längsverschieblich geführten Messerklingenhalterung Download PDF

Info

Publication number
EP0549847B1
EP0549847B1 EP92106101A EP92106101A EP0549847B1 EP 0549847 B1 EP0549847 B1 EP 0549847B1 EP 92106101 A EP92106101 A EP 92106101A EP 92106101 A EP92106101 A EP 92106101A EP 0549847 B1 EP0549847 B1 EP 0549847B1
Authority
EP
European Patent Office
Prior art keywords
knife
catch
knife according
spring
pawl
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.)
Expired - Lifetime
Application number
EP92106101A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0549847A1 (de
Inventor
Harald Prof. Dipl.-Ing. Berns
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.)
Martor Argentax EH Beermann KG
Original Assignee
Martor Argentax EH Beermann KG
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 Martor Argentax EH Beermann KG filed Critical Martor Argentax EH Beermann KG
Publication of EP0549847A1 publication Critical patent/EP0549847A1/de
Application granted granted Critical
Publication of EP0549847B1 publication Critical patent/EP0549847B1/de
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
    • 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 with a knife blade holder which is guided in a longitudinally displaceable manner in a hollow handle body in accordance with the preamble of claim 1.
  • the invention is based on the object improve the handling of the known knife in terms of safety.
  • the locking spring - as well as the return spring - is designed as an elongated tension spring and that the flat locking surface only acted upon by the apex of the locking tooth when the knife blade holder is extended and locked with its longitudinal axis essentially tangential with respect to a circle around it Pawl pivot center extends.
  • the locking spring consists of a short compression spring.
  • the locking spring of the safety knife according to the invention consists of an elongated soft tension spring which, in contrast to a short compression spring, ensures only a slight change in the restoring force per change in length.
  • the elongated soft tension spring according to the invention therefore has a flat spring characteristic (restoring force plotted against the spring deflection), whereas the spring characteristic of the compression spring of the known safety knife is very steep. This means that inherently existing manufacturing tolerances in the elongated soft tension spring according to the invention are very small in contrast to the short compression spring of the known.
  • the locking tooth engages on the flat locking surface of the holding extension of the knife blade holder in such a way that the locking spring must first be tensioned by a certain amount before the guard comes out of engagement.
  • the invention has recognized that such relationships in the tooth geometry of the known safety knife inherently mean a low sensitivity of the pawl. This low response sensitivity is compensated for in the known knife by providing the guard (pawl) with a very large inert mass, but this is accompanied by the disadvantage of a difficult to handle heavy knife design.
  • the invention has overcome this considerable further deficiency in the manageability of the known safety knife in that the flat blocking surface which is only acted upon by the apex of the locking tooth, i.e. in the form of a point or line, with the extended knife blade holder extended, is essentially tangential with its longitudinal axis with respect to a circle around the center of the pivot bearing of the pawl extends.
  • the invention therefore allows an always reproducible restoring force (unchanged responsiveness) because of the elongated soft tension spring and because of the above-described tangential course of the locking surface a relatively low inertial mass of the pawl.
  • the locking position of the pawl which initially appears to be unstable because of the tangential course of the locking surface, nevertheless has a response threshold which is sufficiently high for conventional cutting work because of the inhibiting frictional forces of the safety system.
  • the relatively low inertial mass of the pawl makes the function of the safety device - in contrast to the heavy pawl of the known knife (EP-0 244 517 B1) largely independent of gravity and thus of the handling position in the room.
  • this embodiment according to the invention prevents any deliberate manipulation of the security system from the outside.
  • a favorable installation position for the elongated soft locking spring has been created according to the invention in that the locking spring is arranged alongside the pawl forming an elongated one-armed lever.
  • the length of the locking spring according to the invention is taken into account in that the locking spring engages the pawl adjacent to the pivot bearing of the pawl.
  • an embodiment according to the invention meets these requirements, in which the pawl designed as a one-armed lever is rotatably supported with play on a bearing pin held on the handle body side.
  • the invention provides in a simple manner that the pawl forms at its free end a sliding extension which cooperates with slideways on the handle body and projects on both sides of the pivoting plane of the pawl.
  • the inertial mass is used specifically at the most effective point with a large lever arm, so that the mass of the pawl also in this way (in contrast to the heavy-weight pawl according to EP-0 244 517 B1) can be optimized.
  • the mass accumulation consists of an insert which is held interchangeably in the pawl body, it being possible for there to be a number of interchangeable insert bodies of different densities, each of which has identical external dimensions.
  • Insert bodies of the same outer geometry can also be varied in terms of their mass by hollowing out. If e.g. If the safety knife according to the invention is to be used for carving work in which, as is known, larger accelerations occur from the outset during normal handling, the pawl is assigned a small mass or the insert determining the inert mass is even removed.
  • an insert body of high density for example made of steel or the like, will be chosen to provide a relatively large inert mass.
  • the cavity of the handle body forms at least one receptacle for a reserve insert body.
  • the pawl forms a cylindrical receiving opening for exchangeable cylindrical insert bodies at its free end, which expediently represent straight circular cylinders.
  • the invention has provided a particularly low-friction support for the insert body.
  • the receiving opening is a circular cylindrical opening which encompasses the straight circular cylindrical insert body on its approximately half axial length and that both end faces of the insert body are each guided on a slide rib on the handle body side. In this way, the insert body is guided loosely or floatingly in the pawl and is only coupled to it in motion in the pivoting plane.
  • the invention provides that the locking spring and return spring are identical components. These features are not only advantageous in terms of manufacturing and storage technology. Rather, those features according to the invention ensure that when the safety knife is disassembled and then installed, a mix-up of the locking spring and the return spring is completely uncritical with regard to the triggering threshold or sensitivity of the safety knife.
  • a knife is generally designated by the reference number 10.
  • the knife 10 has two handle shells 11, 12, which are positively joined together and releasably held together by means of a screw connection.
  • the grip shell 11 has a threaded blind hole 13 and the grip shell 12 has a screw bolt 15 held in a receiving opening 14.
  • the grip shells 11, 12 thus jointly form a grip body 16 with an internal cavity H, which accommodates the main functional parts of the knife 10 which will be described below.
  • these main functional parts consist of a pawl 17, a knife blade holder 19 receiving an exchangeable knife blade 18, which is provided with a rear holding extension 20, the latching tooth 21 of which has a Locking surface 22 of the pawl 17 cooperates.
  • the forward ejection direction of the knife blade holder 19 into the cutting position of the knife blade 18 is denoted by a.
  • the protective position of the knife blade 18 is denoted by b.
  • the pawl 17 also forms an inert mass overall. This has the effect that, in the event of an abrupt, violent movement of the knife 10 in accordance with the arrow designated P in FIG. 2, the pawl 17 initially maintains its initial position while the handle body 16 moves downward relative thereto. This has the consequence that the locking surface 22 is removed from the locking tooth 21 and thus the return spring designed as a tension spring allows the knife blade holder to snap back in direction b in its protective position according to FIG. 3.
  • the structural design of the knife 10 can be seen particularly clearly from FIGS. 3-9.
  • the knife blade holder 19 is displaceable in a front guide extension 24 of the grip 11 performed, as can be seen in particular from Fig. 4. It is customary to receive the knife blade 18 designed as a trapezoidal blade and to position it by means of driving cams 25 of the knife blade holder 19. Covering the guide channel 26 by means of a locking slide 27 which can be locked with the front guide extension 24 is also common. The locking slide 27 is removed for the purpose of changing the knife blade, then the knife blade 18 is inserted laterally into its position according to FIG. 3 and then the locking slide 27 is again moved into its locked position according to FIG. 4 (cf. also FIG. 1).
  • the holding extension 20 connects backwards to the knife blade holder 19.
  • the holding extension 20 is firmly connected to the knife blade holder and represents an elongated frame-shaped structure, the rear end of which has an opening 28 over its entire thickness.
  • the opening 28 is penetrated by a holding pin 29 fastened in the grip shell 11, which holds the rear eye 30 of the return spring 23, the front spring eye 31 of which is fastened by a holding pin 32 molded onto the holding extension 20.
  • the locking spring 33 of the pawl 17 is designed as an elongated soft tension spring.
  • the locking spring 33 and the return spring 23 are identical components with the same characteristics.
  • the locking pawl 33 extends alongside the locking pawl 17 which forms an elongated one-armed lever.
  • the locking pawl 33 engages adjacent to the pivot bearing 34 on the locking pawl 17 by means of a rear spring eye 35.
  • the pawl 17 forms a holding pin 37 on a holding arm 36.
  • the front spring eye 38 of the locking spring 33 engages around a holding pin 39 fastened to the grip shell 11.
  • the rotary bearing 34 of the pawl 17 is designed as follows according to FIG. 8:
  • the pawl 17, which is designed as a one-armed lever, is rotatably supported with play in a bearing pin 42 which is inserted in blind holes 40, 41 on both sides of the handle scales 11 and 12.
  • the pawl 17 has a T-shaped extension 43 at its free end, which is on both sides on slideways 44, 45 of the handle scales 11 , 12 supports and there is loosely slidably guided.
  • the pawl 17 forms at its free end facing away from the pivot bearing 34 a mass accumulation in the form of an interchangeably held circular cylindrical insert 46 (for example made of steel) which is made of a material against a reserve insert 48 held in a receiving opening 47 of the handle scales 11, 12 lower density (e.g. made of plastic) can be replaced.
  • an interchangeably held circular cylindrical insert 46 for example made of steel
  • a reserve insert 48 held in a receiving opening 47 of the handle scales 11, 12 lower density (e.g. made of plastic)
  • the pawl-side receptacle for the insert 46 is a circular cylindrical opening 49, in which the insert 46 is accommodated approximately halfway along the axial length in such a way that it is slightly displaceable in its axial direction. Both end faces 50 of the insert body 46 are loosely supported and slide-guided on the slide ribs 51 on the handle body.
  • the insert bodies 46 and 48 have the same dimensions with the above-described different material density.
  • the pawl 17 accordingly has a relatively large inert mass, the trigger threshold is low or the response sensitivity is high.
  • the trigger threshold is increased, however, if the lightweight reserve insert body 48 made of plastic is used instead of the insert body 46.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Knives (AREA)
EP92106101A 1992-01-02 1992-04-09 Messer mit einer längsverschieblich geführten Messerklingenhalterung Expired - Lifetime EP0549847B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4200018A DE4200018C1 (es) 1992-01-02 1992-01-02
DE4200018 1992-01-02

Publications (2)

Publication Number Publication Date
EP0549847A1 EP0549847A1 (de) 1993-07-07
EP0549847B1 true EP0549847B1 (de) 1994-09-07

Family

ID=6449066

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92106101A Expired - Lifetime EP0549847B1 (de) 1992-01-02 1992-04-09 Messer mit einer längsverschieblich geführten Messerklingenhalterung

Country Status (5)

Country Link
US (1) US5203085A (es)
EP (1) EP0549847B1 (es)
JP (1) JP2879279B2 (es)
DE (2) DE4200018C1 (es)
ES (1) ES2064131T3 (es)

Families Citing this family (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4310037C1 (de) * 1993-03-27 1993-12-09 Beermann Kg Martor Argentax Messer mit verschiebbarer Messerklinge
DE4341360C1 (de) * 1993-12-04 1994-08-18 Beermann Kg Martor Argentax Messer mit automatisch wirkender Einzugsvorrichtung der Messerklinge außerhalb ihrer Handhabungsposition
JPH11179072A (ja) * 1997-12-18 1999-07-06 Kds:Kk カッターナイフ
JP3716399B2 (ja) 1998-03-20 2005-11-16 株式会社ケイディエス カッターナイフ
AU5330799A (en) * 1998-07-31 2000-02-21 American Safety Razor Company Automatic spring retractable utility knife
USD434960S (en) * 1999-05-07 2000-12-12 General Housewares Corporation Utility knife
US6233830B1 (en) 1999-05-07 2001-05-22 General Housewares Corporation Utility knife handle
FR2810574B1 (fr) * 2000-06-27 2002-10-31 Mure & Peyrot Cutter a lame retractable automatiquement
US6829827B2 (en) * 2001-08-06 2004-12-14 Han Chung Tseng Artistic knife with spare blades
US7340836B2 (en) * 2003-07-29 2008-03-11 Accurate Concepts, Inc. Hand tool for measuring and cutting
US8857064B2 (en) * 2004-10-15 2014-10-14 Pacific Handy Cutter, Inc. Safety cutter apparatus
US7797836B2 (en) * 2005-08-02 2010-09-21 The Stanley Works Compact utility knife
US8220160B2 (en) * 2005-09-16 2012-07-17 Adco Industries-Technologies, L.P. Box cutter with grip-actuated blade extension
DE102005049411B3 (de) * 2005-10-13 2007-03-01 Martor Kg Messer
US7316070B2 (en) * 2005-11-15 2008-01-08 Irwin Industrial Tool Company Self-retracting utility knife
DE102005057213B3 (de) * 2005-11-29 2007-03-22 Martor Kg Messer
JP4851242B2 (ja) * 2006-06-06 2012-01-11 オルファ株式会社 セーフティカッターナイフ
US7774942B2 (en) * 2006-10-09 2010-08-17 Pacific Handy Cutter, Inc. Utility knife
US20080172883A1 (en) * 2007-01-23 2008-07-24 Accurate Concepts, Inc. Measuring, scoring and cutting tool
ATE514533T1 (de) 2007-04-16 2011-07-15 Adco Ind A Subsidiary Of Dallco Marketing Inc Schneiden von starrem und halbstarrem material
DE102008019441A1 (de) * 2008-04-17 2009-10-22 Martor Kg Messer
US9676106B2 (en) 2008-04-29 2017-06-13 Pacific Handy Cutter, Inc. Safety cutter with guard-actuated blade deployment
US8201336B2 (en) 2008-05-02 2012-06-19 Olympia Tools International, Inc. Retractable utility knife
US8065803B2 (en) * 2008-06-11 2011-11-29 Taylor Brands, Llc Cutting tool
JP5309360B2 (ja) * 2008-07-31 2013-10-09 三菱電機株式会社 半導体装置およびその製造方法
US8695221B2 (en) * 2008-08-21 2014-04-15 Wen Hao Utility knife with extended travel carriage
US8056241B2 (en) * 2008-10-13 2011-11-15 ADCO Industries—Technologies, L.P. Utility cutter
ES2343560B1 (es) * 2009-02-02 2011-07-19 Marta Brucart Bonich Sacacorchos con corta-capsulas telescopico semiautomatico.
US20100223793A1 (en) * 2009-03-04 2010-09-09 The Stanley Works Utility knife
US8307556B2 (en) 2009-06-19 2012-11-13 ADCO Industries—Technologies, L.P. Utility cutter
TWM394220U (en) * 2010-03-24 2010-12-11 jun-feng He Safety utility knife
DE102010019571B4 (de) * 2010-05-05 2020-05-20 Martor Kg Messer
US9289904B2 (en) * 2011-11-14 2016-03-22 Grant Woodrow Hawk Lock optional, spring assisted folding knife
US8782909B1 (en) 2013-02-12 2014-07-22 ADCO Industries—Technologies, L.P. Utility cutter
GB2538280A (en) * 2015-05-14 2016-11-16 Hacksaw & Knife Manufactory Co Ltd Box cutter structure
BR112017026981A2 (pt) * 2015-06-17 2018-09-04 Starrett Ind E Comercio Ltda aperfeiçoamentos introduzidos em estilete compacto de segurança
TWM511938U (zh) * 2015-08-21 2015-11-11 Kantas Products Co Ltd 能在刀柄同側面操控刀刃彈出及收合之彈簧輔助式刀具
KR200486207Y1 (ko) * 2016-05-09 2018-04-16 대우조선해양 주식회사 케이블 피복제거용 전공칼
KR200488029Y1 (ko) * 2016-11-30 2018-12-05 삼성중공업 주식회사 전공칼

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US1623906A (en) * 1926-09-25 1927-04-05 Desmond B Brooks Novelty
GB649406A (en) * 1948-09-14 1951-01-24 Dunlop Rubber Co An improved safety cutting knife
US3999290A (en) * 1976-03-15 1976-12-28 Wood Jess W Safety knife
DE2736395C2 (de) * 1977-08-12 1979-07-12 Martor-Argentax E.H. Beermann Kg, 5650 Solingen Messer mit einer längsverschieblich geführten zugfederbelasteten Messerklingenhalterung
GB8432145D0 (en) * 1984-12-20 1985-01-30 Shirley Inst Knife
GB2192358B (en) * 1986-07-08 1989-12-20 Shirley Inst The Knife
NL8901907A (nl) * 1989-07-24 1991-02-18 Apex Rb Design Kinderveilig hobby mes.

Also Published As

Publication number Publication date
EP0549847A1 (de) 1993-07-07
JPH05212161A (ja) 1993-08-24
DE59200476D1 (de) 1994-10-13
US5203085A (en) 1993-04-20
ES2064131T3 (es) 1995-01-16
JP2879279B2 (ja) 1999-04-05
DE4200018C1 (es) 1992-11-05

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