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EP0377621B1 - Ciseaux - Google Patents

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Publication number
EP0377621B1
EP0377621B1 EP19880907655 EP88907655A EP0377621B1 EP 0377621 B1 EP0377621 B1 EP 0377621B1 EP 19880907655 EP19880907655 EP 19880907655 EP 88907655 A EP88907655 A EP 88907655A EP 0377621 B1 EP0377621 B1 EP 0377621B1
Authority
EP
European Patent Office
Prior art keywords
scissors
permanent magnet
cutting
cutting plane
scissors according
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
EP19880907655
Other languages
German (de)
English (en)
Other versions
EP0377621A1 (fr
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 EP0377621A1 publication Critical patent/EP0377621A1/fr
Application granted granted Critical
Publication of EP0377621B1 publication Critical patent/EP0377621B1/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 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 grip eyes to the other side.
  • the cutting point moves during cutting, ie when the scissors are closed, with the cooperating cutting edges moving against 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 so that this force runs satisfactorily throughout the cut, ie both at the beginning when the scissor halves are still spread wide and the cutting point is close to the Joint, as well as at the end when the cutting point has moved 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. With professional scissors in particular, the adjustment is very important and the grinding is still a complex operation today.
  • the problem lies particularly in the fact that in conventional scissors the contact force is supplied by a substantially rigid element, namely the screw, and it is not easy to achieve such a rigid connecting element that the contact and operating force over the whole Cut and when moving the cutting point over the entire length of the cutting edge corresponds to a desired course.
  • the invention has for its object to improve the contact of the cutting edges on the scissor halves.
  • At least one of the scissor halves consists entirely of permanently 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 shaped piece made of a permanent magnet material, which is inserted into a correspondingly knocked-out or milled recess in the scissor halves in the area of the cutting edges.
  • the insert can be selected from the point of view of maximum magnetic force and can be given a simple shape, which can be important with magnetic active ingredients.
  • a permanent magnet is arranged in the region 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 on 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 pivot in the form of the screw is conventionally located. 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 holes can also be used, especially 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).
  • the scissor halves are held together by the permanent magnet during normal work. However, unusual stresses can occur that exceed the forces of the permanent magnet, for example if a particularly thick cut has to be cut with the scissors or if 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 set out in claims 10 and 11.
  • a further embodiment of the invention is shown, 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 given 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 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 halves of the scissors with hardening and grinding is still very expensive today.
  • 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 upwards from the joint 3 with the cutting edges 5, 6, while the blades 7, 8 extend downward with the grip eyes 9, 10 provided at the free end.
  • the scissor halves 1, 2 are magnetized overall, in such a way that the magnetic poles within the individual scissor half 1, 2 are opposite one another perpendicular to the cutting plane 11, as is shown in FIG. 2 by the distribution the "+" and "-" signs are indicated.
  • the scissor halves 1, 2 attract in the direction indicated by the arrows, as a result of which the cutting edges 5, 6 experience an application pressure that affects the length.
  • the screw 4 is like a conventional one. Scissors 100 are present, but they only serve to pivot the scissor halves 1, 2 against one another and to absorb forces acting in the cutting plane 11.
  • the screw 4 also functions as a safety stop that prevents the scissor halves 1, 2 from being separated.
  • the screw 4 is not involved in providing the system 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, Has 6 inserts 13, 14 made of a permanent magnet material, which have the form 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 to the scissor halves 1, 2 in any suitable manner, for example by screwing, gluing or soldering.
  • an embodiment is shown in which the scissor halves 1 ', 2' in the basin are designed somewhat wider, so that a permanent magnet designed as a flat circular cylinder 16 is of sufficiently large diameter in a corresponding recess through the scissor half 2 ' 17 can be accommodated.
  • the permanent magnet 16 is in the embodiment just as thick as the basin of the scissor half 2 ', but can also be thicker and protrude slightly outside, as indicated at 16' in Fig. 4.
  • the permanent magnet 16 is fixed by pressing, gluing, soldering or in a similar manner in the scissor half 2 'and cooperates with the magnetizable material of the other scissor half 1' in this case.
  • the permanent magnet 16 has a central hole 18 in the form of a blind hole in which a pivot pin 20 is rotatably arranged, which engages through a bore 19 in the scissor half 1 'and is stuck therein.
  • the pivot pin 20 has only the function of the pivot bearing; the definition perpendicular to the cutting plane 11 is made 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 through to the outer surface, as indicated by dashed lines at 18 '.
  • the pivot pin 20 can go through to the outer surface, as indicated by dashed lines at 18 '.
  • the scissor half 1 ' can also be provided in the scissor half 1 'only a blind hole, as shown in dashed lines at 19'.
  • the permanent magnet 16 cooperates 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 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 a coarse force.
  • the permanent magnet 16 has a through hole 21, the permanent magnet 22 has a threaded bore 23 so that a pivot pin 24 can be screwed in in the form of a cap screw 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 serves only 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 magnetic 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 fits into a recess 28 engages the top of the lower, in the scissor half 1 ⁇ used permanent magnet 32.
  • 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. This ensures that the scissors 100 can move freely.
  • 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 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 magnet 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.
  • the lower end of the hinge pin 34 would sit firmly in the lower permanent magnet 42.
  • a ring 39 with an internal thread is pressed, glued or glued into the central hole 38 of the lower permanent magnet 42 attached in a similar manner.
  • the pivot pin 34 ' has a thread 40 in the part engaging in the permanent magnet 42.
  • 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 inadvertent 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.
  • the upper, the scissor half 2 ⁇ assigned permanent magnet 46 is flat at the bottom 43 10, the cup-shaped holding bush 44, which is open towards the bottom, is fastened by gluing, soldering or in a similar manner, so that the outer circumference of the permanent magnet 46 all around left the cylindrical side wall 45 of the holding bush 44.
  • 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 facing the scissor half 2 ⁇
  • the top of the scissors half 1 ⁇ protrudes to engage in the interior of the holding bush 44 such that the bearing bush 48 is rotatably mounted in the ring 47, but largely without play.
  • the permanent magnet 52 is fixed, the thickness of which corresponds approximately to the thickness of the basin of the scissor half 1eren in the exemplary embodiment.
  • 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 there is a safety stop corresponding to the upper half of FIG. 9.
  • 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 forgeable steel alloy, with metallic or ceramic inserts for forming the cutting edges 5 in the area of the cutting edges , 6 are provided.

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  • 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).

Claims (13)

1. Paire de ciseaux avec deux moitiés de ciseau reliées l'une à l'autre pouvant pivoter dans un plan de coupe, qui portent des bords de coupe coopérant quand les bords longitudinaux se rapprochent quand on ferme les ciseaux, qu'on maintient en appui perpendiculairement au plan de coupe, caractérisée en ce qu'on prévoit des moyens, grâce auxquels on maintient les bords de coupe (5, 6) sous une forme d'application magnétique.
2. Paire de ciseaux selon la revendication 1, caractérisée en ce qu'au moins une lame (1, 2) dans la zone des bords de coupe (5, 6) est entièrement en matériau aimant permanent et attire l'autre lame (2, 1) perpendiculairement au plan de coupe (11).
3. Paire de ciseaux selon la revendication 1, caractérisée en ce qu'au moins une lame (1, 2) présente une garniture (13, 14) s'étendant le long du bord de coupe (5, 6) en matériau aimant permanent et qu'elle attire l'autre lame (2, 1) perpendiculairement au plan de coupe (11).
4. Paire de ciseaux selon la revendication 1, caractérisée en ce qu'on place dans la zone de l'articulation (3) un aimant permanent (16, 22, 26, 32, 36, 42, 46, 52), qui attire l'autre lame (1, 2) perpendiculairement au plan de coupe (11).
5. Paire de ciseaux selon la revendication 4, caractérisée en ce qu'au moins une lame (2′) présente au niveau de la charnière un évidement débouchant (17) perpendiculaire au plan de coupe (11), dans lequel on installe un aimant permanent (16).
6. Paire de ciseaux selon la revendication 4 ou 5, caractérisée en ce que l'aimant permanent (16, 36, 42) présente un trou (18, 33, 38) dans lequel est en prise le tourillon d'articulation (20, 34, 34′).
7. Paire de ciseaux selon la revendication 4 ou 5, caractérisée en ce que l'aimant permanent (26) forme lui-même le tourillon d'articulation et est en prise dans un évidement (28) de l'autre lame (1˝).
8. Paire de ciseaux selon la revendication 7, caractérisée en ce que l'aimant permanent (26) présente un prolongement de tourillon d'articulation (27).
9. Paire de ciseaux selon l'une quelconque des revendications 6 à 8, caractérisée en ce qu'on prévoit sur le tourillon d'articulation (24, 34, 34′) une butée de sécurité (tête 25, collet 35, filetage 40) contre la séparation des lames (1˝, 2˝), perpendiculairement au plan de coupe (11).
10. Paire de ciseaux selon la revendication 9, caractérisée en ce que la butée de sécurité (collet 35) comprend un rebord radial à l'extrémité du tourillon d'articulation (34) et une butée en contre-dépouille (37) dans le trou (33) de l'aimant permanent (36) ou la lame (2˝).
11. Paire de ciseaux selon la revendication 10, caractérisée en ce que la butée en contre-dépouille (37) comprend une douille fixée dans le trou en-dessous de la face inférieure du rebord radial (33).
12. Paire de ciseaux selon la revendication 4 ou 5, caractérisée en ce qu'on fixe l'aimant permanent (46) sur l'une des lames (2˝) dans une douille de maintien (44) cylindrique insérée dans une lame (2˝), de sorte qu'il y ait à la périphérie de l'aimant permanent (46) un jeu avec la périphérie intérieure de la douille de maintien (44) et que dans le volume du jeu une douille de palier (48) solidaire de l'autre lame est en prise tout en pouvant tourner sur la périphérie interne de la douille de maintien (44).
13. Paire de ciseaux selon l'une des revendications 4 à 12, caractérisée en ce que les ciseaux comprennent deux aimants permanents coopérant (16, 22, 26, 32, 36, 42, 46, 52) et que pour le reste ils sont essentiellement en matière plastique.
EP19880907655 1987-08-08 1988-08-02 Ciseaux Expired - Lifetime EP0377621B1 (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
DE19873726434 DE3726434C1 (de) 1987-08-08 1987-08-08 Schere
DE3726434 1987-08-08

Publications (2)

Publication Number Publication Date
EP0377621A1 EP0377621A1 (fr) 1990-07-18
EP0377621B1 true EP0377621B1 (fr) 1991-10-16

Family

ID=6333359

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880907655 Expired - Lifetime EP0377621B1 (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)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4014238A1 (de) * 1990-05-04 1991-11-07 Goebel Gmbh Maschf Einrichtung zum andruecken eines substratbearbeitungswerkzeuges
WO1995013168A1 (fr) * 1993-11-09 1995-05-18 'jaguar' Stahlwarenfabrik Gmbh & Co. Kg. Ciseaux, notamment ciseaux de coiffeur
DE19505149C1 (de) * 1995-02-16 1996-10-02 Pietro Poggetti Schere, insbesondere für Friseure
WO2007125491A1 (fr) * 2006-05-01 2007-11-08 Koninklijke Philips Electronics N.V. Dispositif de coupe et appareil pour couper les cheveux
DE102017131355B4 (de) * 2017-12-27 2019-07-25 Lisa Laser Products Gmbh Gelenkschere mit magnetischem Scherenschloss
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
WO1989001392A1 (fr) 1989-02-23
DE3726434C1 (de) 1988-12-08
EP0377621A1 (fr) 1990-07-18

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