EP1714752B1 - Ciseaux - Google Patents

Ciseaux Download PDF

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Publication number
EP1714752B1
EP1714752B1 EP20050425258 EP05425258A EP1714752B1 EP 1714752 B1 EP1714752 B1 EP 1714752B1 EP 20050425258 EP20050425258 EP 20050425258 EP 05425258 A EP05425258 A EP 05425258A EP 1714752 B1 EP1714752 B1 EP 1714752B1
Authority
EP
European Patent Office
Prior art keywords
bush
scissors
rivet
levers
lever
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
EP20050425258
Other languages
German (de)
English (en)
Other versions
EP1714752A1 (fr
Inventor
Dionigi Gianola
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.)
Consorzio Premax
Original Assignee
Consorzio Premax
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 Consorzio Premax filed Critical Consorzio Premax
Priority to DE200560007329 priority Critical patent/DE602005007329D1/de
Priority to EP20050425258 priority patent/EP1714752B1/fr
Priority to PCT/EP2006/003623 priority patent/WO2006111383A1/fr
Publication of EP1714752A1 publication Critical patent/EP1714752A1/fr
Application granted granted Critical
Publication of EP1714752B1 publication Critical patent/EP1714752B1/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
    • B26B13/00—Hand shears; Scissors
    • B26B13/28—Joints

Definitions

  • the present invention refers to a pair of scissors commonly used for cutting various types of materials and objects in general.
  • a pair of scissors comprises two levers pivoted to each other in an intermediate point.
  • each lever defines a power arm and a resistance arm.
  • the two power arms are shaped as opposite handles to be gripped in one hand of the user and the two resistance arms are shaped as opposed blades to make the cut.
  • the two levers of the scissors are pivoted to each other by means of a screw.
  • the first lever has a threaded hole in an intermediate position and the second lever has a through hole.
  • the threaded shank of the screw passes through the through hole of the second lever and engages in a screwing relationship in the threaded hole of the first lever.
  • the second lever can rotate around the shank of the screw which remains integral with first lever.
  • Said type of conventional scissors has various drawbacks due to the screw closing system of the two levers.
  • FR-A-2 605.545 describes a pair of scissors wherein a screw or solid rivet is provided for joining the two levers of the scissor.
  • the solid rivet is in direct contact with holes provided into the levers, which therefore rotate around the rivet.
  • at least a ceramic ring is interposed between the rivet and the holes of the levers in such a way that the rotation takes place between the rivet and the ring.
  • the object of the present invention is to overcome the drawbacks of the prior art by providing scissors that are efficient, effective, long-lasting, cheap and simple to produce.
  • the scissors according to the invention comprise two levers provided with respective coaxial holes in their central portions.
  • a bush is rotatably mounted in the holes of the central portions of the levers, so that the levers can rotate around the bush and a rivet is coupled inside the bush to block the bush and prevent the axial movement of the central portions of the levers.
  • the outside diameter of the bush is greater than the diameter of the pivoting screw, with the result of a greater contact and sliding surface during the rotation of the levers.
  • the riveting pressure of the rivet can be set in the riveting machine to obtain a constant and precise closure of the blades of the scissors during the rotation of the levers.
  • the rivet has a central through hole that can be engaged by a support pin.
  • the scissors according to the invention can be placed rapidly and safely in a case or in a counter display unit provided with suitable scissor support pins.
  • the scissors 1 comprise a first lever 2 and a second lever 2', substantially identical.
  • first lever 2 and the second lever 2' will henceforth be called bottom lever 2 and top lever 2'.
  • Each lever (2, 2') comprises a central portion (20, 20'), a cutting portion (21, 21') and a gripping portion (22, 22').
  • the central portion (20, 20') has a greater thickness than the cutting portion (21, 21').
  • the cutting portion (21, 21') has the shape of a cutting blade and the gripping portion (22, 22') is shaped so as to be able to be gripped easily by the user. For example, an open or closed ring able to allow a user's finger to be inserted therein can be provided at the end of the handle portion (22, 22').
  • a bush 3 is disposed inside the two holes (25, 25'), in a rotating coupling relationship, so that the two levers (2, 2') can rotate with respect to the bush 3.
  • the bush 3 is shaped as a cylinder hollow on the inside and having an axial through hole 30.
  • the thickness of the bush 3 is extremely small and can vary in the range of 0.5 mm to 4 mm, preferably about 1 mm.
  • the outside diameter of the bush 3 is equal to or slightly smaller than the outside diameter of the holes (25, 25') in the central parts of the levers, so as to ensure an adequate surface contact of the outer surface of the bush 3 with the inner surface of the central parts (20, 20') around the holes (25, 25') during the rotation of the levers.
  • both the outer surface of the bush 3 and the inner surfaces of the central parts (20, 20') of the levers which define the holes (25, 25') must be suitably smooth and must have a low coefficient of friction related to the reciprocal sliding.
  • the bush 3 can made of light alloy materials, such as aluminium and brass, and/or of composite materials such as Nylon and Teflon.
  • the outside diameter of the bush 3 must be large enough to ensure the largest possible contact surface in the rotating coupling between the levers 2 and the bush 3.
  • the bush 3 can preferably have an outside diameter greater than 2 mm, preferably 6 mm.
  • the height of the bush 3 is equal to the sum of the thicknesses of the central parts (20, 20') of the levers. In this manner, as shown in Figure 2 , the end edges of the bush 3 are level with the outer surfaces of the central parts (20, 20') of the levers.
  • the rivet 4 has an outside diameter equal to or slightly smaller than the inside diameter of the bush 3.
  • the height of the rivet 4 is greater than the height of the bush 3.
  • the rivet has an edge, for example the top edge 41', folded outwards so as to form a collar with a larger diameter than the inside diameter of the bush 2.
  • a washer 5 having a hole 50 with a slightly larger diameter than the outside diameter of the rivet 4 is also provided.
  • the washer 5 is disposed beneath the central part 20 of the bottom lever 2 around the bottom edge 41 of the rivet.
  • the washer 5 can be made in a single body with the bush 3. In this case the washer 5 forms a collar that protrudes radially outward from the bottom edge of the bush 3.
  • the riveting machine has a special tool which is inserted in the hole 40 of the rivet. This tool, with an eccentric rotation, expands the material of the rivet 4 from the inside outwards.
  • the riveting pressure is set in the riveting machine so as to have a constant closing precision of the blades (21, 21') during the rotation of the two levers (2, 2').
  • the rivet 4 is preferably made of metal material such as steel or light alloys and has a slightly greater thickness than the thickness of the bush 3.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Scissors And Nippers (AREA)

Claims (9)

  1. Ciseaux (1) comprenant un levier inférieur (2) et un levier supérieur (2') présentant des orifices coaxiaux respectifs (25, 25') dans leurs portions centrales (20, 20'),
    - une bague (3) installée à l'intérieur desdits orifices (25, 25') dans les portions centrales (20, 20') des leviers, et
    - un rivet (4) inséré dans ladite bague (3),
    caractérisés par une rondelle (5) disposée autour dudit rivet (4), en-dessous de la partie centrale (20) du levier inférieur (2), et en ce que ledit rivet (4) est formé comme un cylindre creux à l'intérieur, comprenant une embase supérieure (41') possédant un diamètre supérieur au diamètre intérieur de la bague (3), de façon à buter contre la bague (3) et la surface de la partie centrale (20') du levier supérieur (2'), un bord inférieur (41) étant plié vers l'extérieur par-dessus ladite rondelle (5) de façon à bloquer la bague (3) et à empêcher le mouvement axial des portions centrales (20, 20') des levier, tout en leur permettant d'effectuer une rotation autour de ladite bague (3).
  2. Ciseaux (1) selon la revendication 1, caractérisés en ce que la surface extérieure de ladite bague (3) est lisse et constituée d'un matériau présentant un faible coefficient de friction par rapport au matériau des surfaces intérieures des portions centrales (20, 20') des leviers, qui définissent les orifices (25, 25').
  3. Ciseaux (1) selon l'une quelconque des précédentes revendications, caractérisés en ce que ladite bague (3) est constituée d'un alliage léger, tel que l'aluminium et le laiton, et/ou de matériaux composites tels que le nylon et le téflon.
  4. Ciseaux (1) selon l'une quelconque des précédentes revendications, caractérisés en ce que ladite bague (3) possède un diamètre extérieur supérieur à 2 mm.
  5. Ciseaux (1) selon l'une quelconque des précédentes revendications, caractérisés en ce que ladite bague (3) possède une épaisseur située entre 0,5 et 0,4 mm.
  6. Ciseaux (1) selon l'une quelconque des précédentes revendications, caractérisés en ce qu'au moins l'un des bords (41, 41') à l'extrémité dudit rivet (4) possède des fentes.
  7. Ciseaux (1) selon l'une quelconque des précédentes revendications, caractérisés en ce que ledit rivet (4) est constitué d'acier ou d'alliages légers.
  8. Ciseaux (1) selon l'une quelconque des précédentes revendications, caractérisés en ce que ledit bord inférieur (41) dudit rivet (4) est riveté sous contrôle de la pression, afin d'obtenir une précision de fermeture constante des lames de ciseaux.
  9. Ciseaux (1) selon la revendication 1, caractérisés en ce que ladite rondelle (5) forme une seule pièce avec ladite bague (3).
EP20050425258 2005-04-22 2005-04-22 Ciseaux Expired - Lifetime EP1714752B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE200560007329 DE602005007329D1 (de) 2005-04-22 2005-04-22 Schere
EP20050425258 EP1714752B1 (fr) 2005-04-22 2005-04-22 Ciseaux
PCT/EP2006/003623 WO2006111383A1 (fr) 2005-04-22 2006-04-20 Ciseaux

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20050425258 EP1714752B1 (fr) 2005-04-22 2005-04-22 Ciseaux

Publications (2)

Publication Number Publication Date
EP1714752A1 EP1714752A1 (fr) 2006-10-25
EP1714752B1 true EP1714752B1 (fr) 2008-06-04

Family

ID=34943172

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20050425258 Expired - Lifetime EP1714752B1 (fr) 2005-04-22 2005-04-22 Ciseaux

Country Status (3)

Country Link
EP (1) EP1714752B1 (fr)
DE (1) DE602005007329D1 (fr)
WO (1) WO2006111383A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5989200B1 (ja) * 2015-06-08 2016-09-07 株式会社近正 鋏の軸部の構造
ITUB20154041A1 (it) * 2015-09-30 2017-03-30 Consorzio Con Attivita Esterna Fra Imprenditori Coltellinai E Forbiciai E Fabbricanti Di Utensileria Forbice da sartoria
GB2636051A (en) * 2023-11-03 2025-06-11 Endomagnetics Ltd Improvements in and relating to the manufacture of handheld jointed instruments

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB261856A (en) * 1925-08-31 1926-11-30 Verena Winifred Holmes Improvements in scissors, and like tools comprising two leg members pivotally connected
GB2047791B (en) * 1979-03-15 1982-11-24 Willows Reed Products Ltd Pivot bearings
JPS5929649Y2 (ja) * 1981-09-18 1984-08-25 公一 石田 鋏
GB2170137A (en) * 1985-01-30 1986-07-30 Wilkinson Sword Ltd Improvements-in-hand-tools
EP0195868A1 (fr) * 1985-03-29 1986-10-01 Evertyte Inc. Jonction à chevauchement à friction réduite
FR2605545B1 (fr) * 1986-10-22 1991-06-07 Gautier Jean Perfectionnements aux instruments travaillant par cisaillement

Also Published As

Publication number Publication date
EP1714752A1 (fr) 2006-10-25
DE602005007329D1 (de) 2008-07-17
WO2006111383A1 (fr) 2006-10-26

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