EP0247217B1 - Self-sharpening cutting implement and method of making the same - Google Patents

Self-sharpening cutting implement and method of making the same Download PDF

Info

Publication number
EP0247217B1
EP0247217B1 EP19860107110 EP86107110A EP0247217B1 EP 0247217 B1 EP0247217 B1 EP 0247217B1 EP 19860107110 EP19860107110 EP 19860107110 EP 86107110 A EP86107110 A EP 86107110A EP 0247217 B1 EP0247217 B1 EP 0247217B1
Authority
EP
European Patent Office
Prior art keywords
cutting
planar
sharpening
cutting edge
abrasive
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
Application number
EP19860107110
Other languages
German (de)
French (fr)
Other versions
EP0247217A1 (en
Inventor
Sol Levine
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.)
Individual
Original Assignee
Individual
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
Priority to US06/547,046 priority Critical patent/US4592141A/en
Application filed by Individual filed Critical Individual
Priority to DE8686107110T priority patent/DE3666679D1/en
Priority to EP19860107110 priority patent/EP0247217B1/en
Publication of EP0247217A1 publication Critical patent/EP0247217A1/en
Application granted granted Critical
Publication of EP0247217B1 publication Critical patent/EP0247217B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D15/00—Hand tools or other devices for non-rotary grinding, polishing, or stropping
    • B24D15/06—Hand tools or other devices for non-rotary grinding, polishing, or stropping specially designed for sharpening cutting edges
    • B24D15/063—Hand tools or other devices for non-rotary grinding, polishing, or stropping specially designed for sharpening cutting edges for grinding shears, scissors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B13/00—Hand shears; Scissors
    • B26B13/06—Hand shears; Scissors characterised by the shape of the blades

Definitions

  • This invention relates to a self-sharpening cutting implement in general, and more particularly, to self-sharpening scissors, as well as to a method of making the same.
  • a self-sharpening cutting element as specified in the initial clause of claim 1 is known from US-A 2 420 650 where abrasive elements are mounted in longitudinally extending recesses provided in the cutting blades of the shears. Such a construction would then contact one of the cutting edges during use of the shears and thus through this movement execute a sharpening operation on the cutting edge.
  • This arrangement requires a good deal of precision in the manufacture of such shears, as both the abrasive elements and the longitudinal recesses need to be precisely manufactured and assembled.
  • a concomitant object is to devise a method of making a cutting implement self-sharpening, which method is easy to perform and which achieves reliable results.
  • a self-sharpening cutting implement which comprises a pair of elongated cutting elements each having a gripping portion and a cutting portion, each of said cutting portions having a cutting edge and a substantially planar adjacent surface; means for so connecting the cutting elements to one another intermediate the cutting and gripping portions so that the planar adjacent surfaces extend along a common plane and the cutting elements perform a pivoting movement about the connecting means along the aforementioned plane with each of the cutting edges contacting the planar adjacent surface of the respectively other of the cutting elements at least in a part of the trajectory of pivotal movement thereof; and a film-like honing layer of an abrasive element applied to one of the planar adjacent surfaces and constituting a permanent part thereof, extending from the cutting edge of the planar adjacent surface and co-extensive therewith along the common plane across the cutting element having said one planar adjacent surface.
  • a particular advantage of this structure is that the layer of abrasive material need not be precisely aligned since it is applied to a surface that is already in the proper position relative to the cutting edge due to the construction of the cutting element and the operation of the connecting means, and that it can only be worn off, but never lost since it constitutes an integral part of the respective cutting element. Moveover, the layer can be reapplied time and time again in a relatively simple manner not requiring any extraordinary skills.
  • the abrasive layer can be constituted by various materials, such as a plated abrasive material, sprayed abrasive material, vapor depositied abrasive material, vacuum metallized abrasive material, sintered abrasive material, or an adhered abrasive material, such as a mixture of stettable organic binder and particulate abrasive material, such as grit.
  • materials such as a plated abrasive material, sprayed abrasive material, vapor depositied abrasive material, vacuum metallized abrasive material, sintered abrasive material, or an adhered abrasive material, such as a mixture of stettable organic binder and particulate abrasive material, such as grit.
  • a further feature the invention resides in a method of making a cutting implement, said cutting implement which includes two elongated elements that are movable relative in a predetermined path and have planar surfaces extending along a common plane and at least one element being delimited by a cutting edge that is self-sharpening, which is produced by a method which comprises the step of applying an abrasive material in a permanent manner to the other of the planar surfaces for abrading and sharpening the cutting edge during the movement in the path as the cutting edge slides along the abrasive material layer applied in an applying step.
  • the applying step includes spraying the abrasive material onto the planar surface, plating the abrasive material onto the planar surface vapor depositing the abrasive material onto the planar surface, vacuum metallizing the abrasive material onto the planar surface, sintering the abrasive material onto the planar surface, adhering an adhesive substance having abrasive properties to the planar surface, or adhering an adhesive substance having abrasive particles interspersed therein to the planar surface.
  • reference numeral 1 identifies a cutting implement, such as scissors, which includes two cutting elements 2 and 3 which are connected to one another by a pivot hinge 4 for pivoting along a common plane extending parallel to the plane of the drawing.
  • the cutting elements 2 and 3 have respective gripping portions 2a and 3a configured as eyelets, and respective cutting portions 2b and 3b which have respective planar, recess-free surfaces 2c and 3c extending in the aforementioned plane and delimited by respective cutting edges 2d and 3d.
  • a film-like layer 5 of an abrasive or honing material is integrally and permanently applied to the planar surface 3c of the cutting portion 3b. As shown in FIG. 2, the layer 5 is applied by a spraying nozzle 6 that is aimed at the planar surface 3c during the spraying operation.
  • the spraying operation is performed in a conventional manner and using conventional materials, either at room temperature or elevated temperatures.
  • the abrasive layer 5 can also be applied by using other known techniques, such as by plating, vacuum metallizing, vapor deposition, sintering, or by adhering the layer 5 to the surface 3c using an abrasive adhesive substance, especially a binder having particulate abrasive material interspersed and embedded therein, such as a settable mixture of epoxy and grit.
  • an abrasive adhesive substance especially a binder having particulate abrasive material interspersed and embedded therein, such as a settable mixture of epoxy and grit.
  • the abrasive layer 5 has been applied to the planer surface 3c and has become a permanent integral part of the cutting portion 3b, such as by cooling, setting or otherwise hardening, it is possible to use the scissors 1 for cutting.
  • the cutting edge 2d of the cutting portion 2b slides along the abrasive layer 5 during at least a part of the pivoting movement of the cutting portion 3b, as the planar surfaces 2c and 3c are situated in a common plane.
  • the contact of the cutting edge 2d with the abrasive layer 5, on the one hand sharpens the cutting edge 2d by removing excess material thereof.
  • this contact also hardens the material of the cutting portion 2b at the region of the cutting edge 2d, so that the tendency of the cutting edge 2d to become dull during its contact with the material being shorn or severed is counteracted and thus the time period of sharpness of the cutting edge 2d is effectively extended.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Description

  • This invention relates to a self-sharpening cutting implement in general, and more particularly, to self-sharpening scissors, as well as to a method of making the same.
  • A self-sharpening cutting element as specified in the initial clause of claim 1 is known from US-A 2 420 650 where abrasive elements are mounted in longitudinally extending recesses provided in the cutting blades of the shears. Such a construction would then contact one of the cutting edges during use of the shears and thus through this movement execute a sharpening operation on the cutting edge. This arrangement requires a good deal of precision in the manufacture of such shears, as both the abrasive elements and the longitudinal recesses need to be precisely manufactured and assembled.
  • Notwithstanding the precision in manufacture, in the use of such shears, the abrasive elements are likely to be dislodged from the longitudinal recesses.
  • It is the object of the present invention to provide a cutting implement which is simple in construction, inexpensive to manufacture, easy to use, and has reliable self-sharpening properties.
  • A concomitant object is to devise a method of making a cutting implement self-sharpening, which method is easy to perform and which achieves reliable results.
  • In pursuance of this objects, one aspect of the invention resides in a self-sharpening cutting implement which comprises a pair of elongated cutting elements each having a gripping portion and a cutting portion, each of said cutting portions having a cutting edge and a substantially planar adjacent surface; means for so connecting the cutting elements to one another intermediate the cutting and gripping portions so that the planar adjacent surfaces extend along a common plane and the cutting elements perform a pivoting movement about the connecting means along the aforementioned plane with each of the cutting edges contacting the planar adjacent surface of the respectively other of the cutting elements at least in a part of the trajectory of pivotal movement thereof; and a film-like honing layer of an abrasive element applied to one of the planar adjacent surfaces and constituting a permanent part thereof, extending from the cutting edge of the planar adjacent surface and co-extensive therewith along the common plane across the cutting element having said one planar adjacent surface.
  • A particular advantage of this structure is that the layer of abrasive material need not be precisely aligned since it is applied to a surface that is already in the proper position relative to the cutting edge due to the construction of the cutting element and the operation of the connecting means, and that it can only be worn off, but never lost since it constitutes an integral part of the respective cutting element. Moveover, the layer can be reapplied time and time again in a relatively simple manner not requiring any extraordinary skills.
  • The abrasive layer can be constituted by various materials, such as a plated abrasive material, sprayed abrasive material, vapor depositied abrasive material, vacuum metallized abrasive material, sintered abrasive material, or an adhered abrasive material, such as a mixture of stettable organic binder and particulate abrasive material, such as grit.
  • A further feature the invention resides in a method of making a cutting implement, said cutting implement which includes two elongated elements that are movable relative in a predetermined path and have planar surfaces extending along a common plane and at least one element being delimited by a cutting edge that is self-sharpening, which is produced by a method which comprises the step of applying an abrasive material in a permanent manner to the other of the planar surfaces for abrading and sharpening the cutting edge during the movement in the path as the cutting edge slides along the abrasive material layer applied in an applying step. The applying step includes spraying the abrasive material onto the planar surface, plating the abrasive material onto the planar surface vapor depositing the abrasive material onto the planar surface, vacuum metallizing the abrasive material onto the planar surface, sintering the abrasive material onto the planar surface, adhering an adhesive substance having abrasive properties to the planar surface, or adhering an adhesive substance having abrasive particles interspersed therein to the planar surface.
  • In the accompanying drawings:
    • FIG. 1 is a side elevational view of self-sharpening scissors made in accordance with the present invention;
    • FIG. 2 is an enlarged sectional view taken along the line 2-2 of FIG. 1 during a spraying operation; and
    • FIG. 3 is a view similar to that of FIG. 2 but taken during the cutting operation.
  • Referring now to FIG. 1, reference numeral 1 identifies a cutting implement, such as scissors, which includes two cutting elements 2 and 3 which are connected to one another by a pivot hinge 4 for pivoting along a common plane extending parallel to the plane of the drawing. The cutting elements 2 and 3 have respective gripping portions 2a and 3a configured as eyelets, and respective cutting portions 2b and 3b which have respective planar, recess- free surfaces 2c and 3c extending in the aforementioned plane and delimited by respective cutting edges 2d and 3d.
  • A film-like layer 5 of an abrasive or honing material is integrally and permanently applied to the planar surface 3c of the cutting portion 3b. As shown in FIG. 2, the layer 5 is applied by a spraying nozzle 6 that is aimed at the planar surface 3c during the spraying operation. The spraying operation is performed in a conventional manner and using conventional materials, either at room temperature or elevated temperatures. However, instead of using the illustrated spraying technique, the abrasive layer 5 can also be applied by using other known techniques, such as by plating, vacuum metallizing, vapor deposition, sintering, or by adhering the layer 5 to the surface 3c using an abrasive adhesive substance, especially a binder having particulate abrasive material interspersed and embedded therein, such as a settable mixture of epoxy and grit.
  • Once the abrasive layer 5 has been applied to the planer surface 3c and has become a permanent integral part of the cutting portion 3b, such as by cooling, setting or otherwise hardening, it is possible to use the scissors 1 for cutting. During the cutting operation, as shown in FIG. 3, the cutting edge 2d of the cutting portion 2b slides along the abrasive layer 5 during at least a part of the pivoting movement of the cutting portion 3b, as the planar surfaces 2c and 3c are situated in a common plane. The contact of the cutting edge 2d with the abrasive layer 5, on the one hand, sharpens the cutting edge 2d by removing excess material thereof. On the other hand, this contact also hardens the material of the cutting portion 2b at the region of the cutting edge 2d, so that the tendency of the cutting edge 2d to become dull during its contact with the material being shorn or severed is counteracted and thus the time period of sharpness of the cutting edge 2d is effectively extended.
  • It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of arrangements differing from the type described above, such as in shears, pocket knives, mowers and other cutting implements or the like.

Claims (2)

1. Self-sharpening cutting implement (1), comprising
- a pair of elongated cutting elements (2, 3) each having a gripping portion (2a, 3a) and a cutting portion (2b, 3b), each of said cutting portions (2b, 3b) having a cutting edge (2d, 3d) and a substantially planar adjacent surface (2c, 3c);
- means (4) for so connecting said cutting elements (2, 3) to one another intermediate said gripping and cutting portions (2a, 3a and 2b, 3b) thereof for pivoting movement relative to one another about said connecting means (4) and along a common plane, the planar adjacent surfaces (2c, 3c) extending in said common plane and each of the cutting edges (2d, 3d) contacting the planar adjacent surface of the respectively other cutting element (2, 3) at least in a part of the trajectory of relative pivotal movement thereof; and
- an abrasive element applied to one of the planar adjacent surfaces (3c) and constituting a permanent portion of said one planar adjacent surface (3c), the abrasive element (5) being operative for abrading and sharpening the cutting edge (2d) of the respectively other cutting element (2) during the movement thereof in said part of said trajectory, characterized in that the abrasive element is a film-like honing layer (5) extending from the cutting edge (3d) of said planar adjacent surface (3c) and co-extensive therewith along the common plane across the cutting element (3) having said one planar adjacent surface (3c).
2. A method of making a cutting implement (1), which includes two elongated elements (2, 3) that are movable relative to one another in a predetermined path and have planar surfaces (2c, 3c) extending along a common plane and at least one being delimited by a cutting edge (2d) that is self-sharpening, comprising the step of applying an abrasive material in a permanent manner to the other of the planar surfaces (3c) for abrading and sharpening the cutting edge (2d) during the movement in the path as the cutting edge (2d) slides along the abrasive material layer (5), characterized in that the applying step includes spraying, plating, vapor depositing, vacuum metallizing, sintering or adhering a film-like honing layer (5) onto said planar surface (3c).
EP19860107110 1983-10-31 1986-05-26 Self-sharpening cutting implement and method of making the same Expired EP0247217B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US06/547,046 US4592141A (en) 1983-10-31 1983-10-31 Self-sharpening cutting implement and method of making the same
DE8686107110T DE3666679D1 (en) 1986-05-26 1986-05-26 Self-sharpening cutting implement and method of making the same
EP19860107110 EP0247217B1 (en) 1986-05-26 1986-05-26 Self-sharpening cutting implement and method of making the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19860107110 EP0247217B1 (en) 1986-05-26 1986-05-26 Self-sharpening cutting implement and method of making the same

Publications (2)

Publication Number Publication Date
EP0247217A1 EP0247217A1 (en) 1987-12-02
EP0247217B1 true EP0247217B1 (en) 1989-11-02

Family

ID=8195154

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860107110 Expired EP0247217B1 (en) 1983-10-31 1986-05-26 Self-sharpening cutting implement and method of making the same

Country Status (2)

Country Link
EP (1) EP0247217B1 (en)
DE (1) DE3666679D1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE9601564D0 (en) * 1996-04-24 1996-04-24 Manuel Braun Self-sharpening cutting device
US7918032B2 (en) 2009-07-14 2011-04-05 Sullivans Usa Ruler with abrasive edge

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2420650A (en) * 1944-12-15 1947-05-20 Sr Roy F Burch Self-sharpening shears
DE2360729A1 (en) * 1973-12-06 1975-06-12 Wendel Dr Ing Eberhard Production process for scissors - involves coating surfaces to be ground for sharpening with thick hard nickel layer
DE3022510A1 (en) * 1979-06-15 1980-12-18 Werner Vogel Scissors self sharpening system - uses cutting sheet with layer of grinding material coated with plastics

Also Published As

Publication number Publication date
EP0247217A1 (en) 1987-12-02
DE3666679D1 (en) 1989-12-07

Similar Documents

Publication Publication Date Title
JPH0753914Y2 (en) Knife blade
JP5375977B2 (en) Blade structure for a blade and a blade provided with the blade structure
US5594966A (en) Knife with blade sharpener stored in knife handle
US5056227A (en) Razor blade technology
US6260280B1 (en) Knife with ceramic blade
US4592141A (en) Self-sharpening cutting implement and method of making the same
EP0247217B1 (en) Self-sharpening cutting implement and method of making the same
DE60222234D1 (en) Knife and blade sharpener
US5157879A (en) Broadhead arrow sharpener
MX170705B (en) Razors for shaving
EP1029624A3 (en) Circular saw blades with cutting teeth composed of ultrahard tool material, and method for its production
CA1258577A (en) Self-sharpening cutting implement and method of making the same
JP4966065B2 (en) Processing blades for building materials
JPS60212187A (en) Scissors
US2058348A (en) Sharpener for razor blades
JP3906106B2 (en) Knife
JP3021591U (en) Scissors sharpener
JPH10116884A (en) Cutter for wafer protection tape
JPS6352820A (en) Blade of reaper
JP2510566Y2 (en) Knife sharpener
JPS62173193A (en) Cutting tool
GB1582330A (en) Cutting device
JPH049436B2 (en)
JP2005193337A (en) Grindstone
JPS6288594A (en) Cutting tool

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19870427

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR IT

17Q First examination report despatched

Effective date: 19880203

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR IT

ITF It: translation for a ep patent filed
REF Corresponds to:

Ref document number: 3666679

Country of ref document: DE

Date of ref document: 19891207

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19910412

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19910423

Year of fee payment: 6

ITTA It: last paid annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Effective date: 19930129

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19930202

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

Effective date: 20050526