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WO1989001392A1 - Ciseaux - Google Patents

Ciseaux Download PDF

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Publication number
WO1989001392A1
WO1989001392A1 PCT/EP1988/000704 EP8800704W WO8901392A1 WO 1989001392 A1 WO1989001392 A1 WO 1989001392A1 EP 8800704 W EP8800704 W EP 8800704W WO 8901392 A1 WO8901392 A1 WO 8901392A1
Authority
WO
WIPO (PCT)
Prior art keywords
scissors
permanent magnet
scissor
scissors according
cutting plane
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.)
Ceased
Application number
PCT/EP1988/000704
Other languages
German (de)
English (en)
Inventor
Pietro Poggetti
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
Application filed by Individual filed Critical Individual
Priority to AT88907655T priority Critical patent/ATE68392T1/de
Publication of WO1989001392A1 publication Critical patent/WO1989001392A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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 invention relates to a pair of scissors corresponding to the preamble of claim 1.
  • Such scissors are generally known.
  • the two elongated scissor halves are connected to one another approximately in the middle by a hinge pin forming the joint, for example a screw.
  • the parts of the scissor halves that support the cutting edges extend from the joint to one side, the stalks with the gripping eyes to the other side.
  • the cutting point moves during cutting, ie when the scissors are closed, with the cooperating cutting edges moving towards one another outward from the joint.
  • the quality of the cut is determined by the quality of the cutting edges and the force that holds the scissor halves in contact with the cutting edges perpendicular to the cutting plane. It is not easy to design the scissors in such a way that this force runs satisfactorily throughout the cut, ie both at the beginning when the scissor halves are still widely spread and the cutting point is close to the Joint, as well as at the end when the cutting point has shifted near the ends of the scissor halves.
  • the contact force is not only decisive for the cut as such, but also for the operating force of the scissors. Especially with professional scissors, the adjustment is very important and the grinding is still a complex operation today.
  • the problem lies particularly in the fact that, in the conventional scissors, the contact force is supplied by an essentially rigid element, namely the screw, and it is not easy to achieve with such a rigid connecting element that the system - And actuating force over the entire cut and when moving the cutting point over the entire length of the cutting edge corresponds to a desired course.
  • the object of the invention is to improve the position of the cutting edges on the scissor halves.
  • At least one of the scissor halves consists entirely of permanent magnetic material, at least in the area of the cutting edges (claim 2).
  • the magnetization should be set so that the poles on the scissor halves are opposite each other perpendicular to the cutting plane.
  • the scissor halves are usually made of steel, which can be permanently magnetized in a magnetic field.
  • the insert can consist of a suitable molding made of a permanent magnet material, which is inserted into a corresponding knocked-out or milled recess in the scissor halves in the area of the cutting edges.
  • the insert can be chosen entirely from the point of view of maximum magnetic force and can be given a simple shape, which can be important with magnetic active substances.
  • a permanent magnet is arranged in the area of the joint, which attracts the other half of the scissors (claim 4).
  • the task of the permanent magnet or the magnetic design of the scissor halves is only to deliver the contact force perpendicular to the cutting plane.
  • the two halves of the scissors should be supported against one another by means of a hinge pin or in a similar manner in order to absorb the cutting forces.
  • the effect of the permanent magnet is of course more pronounced the larger it is.
  • the broadest point of the scissors is generally in the pelvis, where the hinge pin is conventionally in the form of the screw. So if the permanent magnet is placed in the place with the most space, i.e. in the pool, there must be some interaction with the pivot pin.
  • the permanent magnet expediently has a perforation in this aspect, in which the pivot pin engages.
  • the perforation can be continuous, which is preferable in terms of simple manufacture of the permanent magnet.
  • blind perforations are also possible, particularly from the point of view that the pivot pin is then not visible from the outside.
  • the permanent magnet itself can also form the hinge pin and engage in a recess in the other half of the scissors (claim 7). It is also possible to provide the permanent magnet with a hinge pin attachment (claim 8).
  • the scissor halves are held together by the permanent magnet during normal work.
  • unusual stresses can occur that exceed the forces of the permanent magnet, for example if the scissors have to be used to cut a particularly thick cut or the scissors fall to the ground.
  • a safety stop (claim 9) can be provided which does not take effect during normal work with the scissors.
  • Such a safety stop can be designed constructively in the manner reproduced in claims 10 and 11.
  • Claim 12 shows a further embodiment of the invention, which has the advantage that the permanent magnet only has to be designed as a simple cylindrical disk. It is glued or soldered into the holding sleeve with a flat side, which in turn is inserted into a pair of scissors, for example pressed in, glued in or soldered in.
  • the invention is suitable for normal scissors in which the scissor halves are conventionally die-cut from a suitable steel.
  • the scissors body can also consist of a non-metallic material such as plastic, because the contact force is already provided by the two permanently magnetically interacting elements.
  • the expression "essentially plastic" is intended to mean that additional metallic inserts which form the cutting edges may also be present in the area of the cutting edges. Such a construction of the scissors would make them considerably cheaper, because the production of the forged scissor halves with hardening and grinding is still very expensive today.
  • Fig. 1 shows a view of a pair of scissors
  • Fig. 2 shows a section along the line II-II with closed scissors
  • Fig. 3 shows a corresponding section of a modified A s enclosuresform
  • FIG. 4 shows a section along the line IV-IV in FIG. 5 with permanent magnets arranged in the region of the joint;
  • FIG. 5 shows a partial view corresponding to FIG. 1 of the embodiment according to FIG. 4;
  • Fig. 6 shows a section along the line VI-VI in Fig. 7;
  • FIG. 7 shows a partial view corresponding to FIG. 1 of the embodiment according to FIG. 6;
  • the scissors designated 100 as a whole in FIG. 1 are hairdressing scissors with two elongated scissor halves 1, 2, which are pivotally connected to one another in the plane parallel to the plane of the drawing, approximately in the middle by a pivot pin 3 in the form of a screw 4.
  • the scissor halves 1, 2 each have parts that extend upward from the joint 3 with the cutting edges 5, 6, while the blades 7, 8 extend downward with the gripping eyes 9, 10 provided at the free end.
  • the scissor halves 1, 2 are magnetized as a whole, in such a way that the magnetic poles within the individual scissor halves 1, 2 lie opposite one another perpendicular to the cutting plane 11, as is shown in FIG.
  • the screw 4 is present like in a conventional pair of scissors 100, but it only serves to pivot the scissor halves 1, 2 against one another and to absorb forces acting in the cutting plane 11. In an emergency, the screw 4 also functions as a safety stop which prevents the scissor halves 1, 2 from being separated. However, the screw 4 is not involved in the provision of the contact pressure perpendicular to the cutting plane 11 along the cutting edges 5, 6. Rather, this is provided by the magnetic forces. For this reason, a certain amount of play 12 is also indicated on the underside of the head of the screw 4.
  • the difference is only that not all of the material of the scissor halves 1, 2 is massively magnetized, but that conventional, normally unmagnetized scissors 100 in the scissor halves 1, 2 in the area of the cutting edges 5.6 has inserts 13, 14 made of a permanent magnet material, which have the shape of flat strips, the outline of which is indicated in FIG. 1 by the dash-dotted area.
  • the recesses 15 for receiving the inserts 13, 14 are knocked out or milled out of the scissor halves 1, 2.
  • the inserts 13, 14 are fastened in some suitable manner to the scissor halves 1, 2, for example by screws, by gluing or by soldering. With regard to the magnetization of the inserts 13, 14, what has been said regarding FIG.
  • the scissor halves 1 ', 2' in the basin are designed somewhat wider, so that a permanent magnet 16 designed as a flat circular cylinder is of a sufficiently large diameter in a corresponding through the scissors half 2 'continuous recess 17 can be housed.
  • the permanent magnet 16 is as thick as the basin of the scissor half 2 ', but can also be thicker and protrude slightly from the outside, as indicated at 16' in FIG. 4.
  • the permanent magnet 16 is fastened in the scissor half 2 'by pressing, gluing, soldering or in a similar manner and interacts with the material of the other scissor half e 1' which can be magnetized in this case.
  • the permanent magnet 16 has a central perforation 18 in the form of a blind bore, in which a pivot pin 20 is rotatably arranged, which engages through a bore 19 in the scissor half 1 * and is fixed therein.
  • the hinge pin 20 has only the function of the pivot bearing; the determination perpendicular to the cutting plane 11 takes place exclusively by the force of the permanent magnet 16.
  • the permanent magnet 16 can also have a continuous bore and the pivot pin 20 can go as far as the outer surface, as is indicated by dashed lines at 18 '.
  • the pivot pin 20 can go as far as the outer surface, as is indicated by dashed lines at 18 '.
  • only one pocket hole can also be provided in the scissor half 1 *, as is shown in dashed lines at 19 '.
  • the permanent magnet 16 interacts with the material of the scissor half 1 'in the embodiment according to FIG. 4, two permanent magnets 16, 22 are provided in the scissor halves 2 "and 1" in the embodiment according to FIGS. 6 and 7, respectively for this purpose in the area of the basin in the manner shown in FIG. 7 have a circular expanded plan.
  • the permanent magnets 16, 22 are polarized in the manner indicated by the "+” or "-" signs, so that they are pulled towards one another with great force.
  • the permanent magnet 16 has a through bore 21, the permanent magnet 22 has a threaded bore 23, so that a pivot pin 24 in the form of a cap screw can be screwed in, which fits snugly into the threaded bore 23 but is not tightened.
  • the head 25 of the cap screw has some play to the top of the permanent magnet 16 and only serves as a safety stop against unwanted separation of the scissor halves 1 ", 2".
  • a corresponding iron disk can also be provided, which is simpler in view of the provision of the threaded bore 23, which is difficult to install in ceramic magnet bodies.
  • the upper permanent magnet 26 inserted into the scissor half 2 ", which for this purpose has a flat cylindrical hinge pin extension 27 on the underside, which engages in a recess 28 on the upper side of the lower permanent magnet 32 inserted into the scissor half 1 ".
  • the recess 28 is also flat-cylindrical and has on its circumference a bearing ring 29 made of a low-friction plastic, against which the pivot pin shoulder 27 abuts with its circular-cylindrical outer circumference. In this way, good mobility of the scissors 100 is ensured.
  • the definition perpendicular to the cutting plane 11 is made only by the magnetic force.
  • the permanent magnet 26 can also be continuously cylindrical, as indicated at 26 '.
  • the scissor halves 2 "and 1" are opposite one another Permanent magnets 36, 42 are used, but in contrast to FIG. 8 a safety stop against unintentional separation of the scissor halves 1 ", 2" is provided.
  • a safety stop against unintentional separation of the scissor halves 1 ", 2" is provided.
  • Two different embodiments of such a safety stop are shown.
  • the pivot pin 34 has at its upper end a radial collar 35, the diameter of which corresponds to the diameter of a central perforation made in the permanent magnets 36.
  • a plastic ring is pressed tightly into the perforation 33 as an abutment 37, which, although it still permits rotation of the articulated shaft 34, prevents it from being pulled out of the perforation 33 downward according to FIG. 9.
  • the lower end of the pivot pin 34 would sit firmly in the lower permanent magnet 42.
  • a ring 39 with an internal thread is in the central perforation 38 of the lower permanent magnet 42 pressed in, glued in or fastened in a similar manner.
  • the hinge pin 34 ' has a thread 40 in the part engaging in the permanent magnet 42.
  • the upper end of the pivot pin 34 is firmly seated in the permanent magnet 36.
  • the thread pairing does not serve to provide the pressing force of the cutting edges 5, 6 perpendicular to the cutting plane 11, but only as a safeguard against unintentional separation of the scissor halves 1 ", 2".
  • the embodiment according to FIG. 10 places the lowest demands on the shape of the permanent magnets 46, 52. These need only be designed as flat circular cylinders.
  • This side wall 45 is provided on the inside with a coating or a ring 47 made of a low-friction plastic, which serves as a bearing surface for the cylindrical side wall 49 of a cup-shaped bearing bush 48, which is seated in a corresponding recess in the scissor half 1 "and over which the Scissor half 2 "facing the top of scissor half 1" protrudes to engage in the interior of the holding bush 44 in such a way that the bearing bush 48 can be rotated in the ring 47 but is largely free of play.
  • the permanent magnet 52 is fixed inside the bearing bush 48, whose thickness in the exemplary embodiment corresponds approximately to the thickness of the basin of the scissor half 1 ".
  • the upper edge of the side wall 49 of the bearing bush 48 can have a radially outwardly projecting collar which sits on the top of a correspondingly narrower ring 47, so that here too a safety stop corresponding to the upper half of FIG. 9 is given.
  • the permanent magnets do not necessarily have to have a circular cross section, although this is of course the most preferred embodiment of the manufacture of the permanent magnets and the corresponding recesses in the scissor halves. It is also not necessary for the permanent magnets accommodated in the two scissor halves to have exactly the same diameter.
  • the bodies of the scissor halves 1, 2 of FIGS. 3 and 1 "and 2" of FIGS. 6 to 10 can also consist of plastic instead of the customary malleable steel alloy, metallic or ceramic inserts for forming the Cutting edges 5,6 are provided.

Landscapes

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

Abstract

Des ciseaux se caractérisent par le fait que la force qui s'exerce sur les bords tranchants perpendiculairement au plan de coupe (11) n'est pas générée par la vis (4) qui forme le pivot (3) mais par une force magnétique qui s'exerce perpendiculairement au plan de coupe (11).
PCT/EP1988/000704 1987-08-08 1988-08-02 Ciseaux Ceased WO1989001392A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88907655T ATE68392T1 (de) 1987-08-08 1988-08-02 Schere.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP3726434.6 1987-08-08
DE19873726434 DE3726434C1 (de) 1987-08-08 1987-08-08 Schere

Publications (1)

Publication Number Publication Date
WO1989001392A1 true WO1989001392A1 (fr) 1989-02-23

Family

ID=6333359

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1988/000704 Ceased WO1989001392A1 (fr) 1987-08-08 1988-08-02 Ciseaux

Country Status (3)

Country Link
EP (1) EP0377621B1 (fr)
DE (1) DE3726434C1 (fr)
WO (1) WO1989001392A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0455041B1 (fr) * 1990-05-04 1993-06-16 Maschinenfabrik GOEBEL GmbH Dispositif pour serrer un instrument de traitement de substrat
WO1995013168A1 (fr) * 1993-11-09 1995-05-18 'jaguar' Stahlwarenfabrik Gmbh & Co. Kg. Ciseaux, notamment ciseaux de coiffeur
US8132332B2 (en) * 2006-05-01 2012-03-13 Koninklijke Philips Electronics N.V. Cutting device
CN117378501A (zh) * 2023-11-22 2024-01-12 山东安然纳米实业发展有限公司 一种植物组织培养罐及其控制方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19505149C1 (de) * 1995-02-16 1996-10-02 Pietro Poggetti Schere, insbesondere für Friseure
DE102017131355B4 (de) * 2017-12-27 2019-07-25 Lisa Laser Products Gmbh Gelenkschere mit magnetischem Scherenschloss

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
No relevant documents disclosed. *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0455041B1 (fr) * 1990-05-04 1993-06-16 Maschinenfabrik GOEBEL GmbH Dispositif pour serrer un instrument de traitement de substrat
WO1995013168A1 (fr) * 1993-11-09 1995-05-18 'jaguar' Stahlwarenfabrik Gmbh & Co. Kg. Ciseaux, notamment ciseaux de coiffeur
US8132332B2 (en) * 2006-05-01 2012-03-13 Koninklijke Philips Electronics N.V. Cutting device
CN117378501A (zh) * 2023-11-22 2024-01-12 山东安然纳米实业发展有限公司 一种植物组织培养罐及其控制方法

Also Published As

Publication number Publication date
EP0377621B1 (fr) 1991-10-16
DE3726434C1 (de) 1988-12-08
EP0377621A1 (fr) 1990-07-18

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