|
(11) | EP 0 115 358 B1 |
| (12) | EUROPEAN PATENT SPECIFICATION |
|
|
| (54) |
Hand-scissors Handschere Ciseaux à main |
|
|
|||||||||||||||||||||||||||||||
| Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention). |
[0001] The invention relates to a pair of hand-scissors, comprising two relatively pivotable blades having cooperating cutting edges and operating means adapted to be gripped by the hand.
[0002] Such a pair of scissors is known from DE-A-1 553 695. The disadvantage of this prior art pair of scissors is that in cutting relatively hard materials they become blunt in an intolerantly short time, causing the scissors to have to be repeatedly re- sharpened, or preventing their use, so that one has to resort to other techniques.
[0003] An example is the cutting of fibres, e.g. those which are commercialized under the registered trade marks ArenkaO by the Firm Enka Glanzstoff, and KeviarO by the Firm Dupont-de Nemours. Such fibres are used and will in the future be used, to an increasing degree among other things for reinforcement of glass-fibre cables for telecommunication purposes. For such an application it is necessary that glass-fibre cables can be readily worked in situ for coupling with end- apparatus, connection with other cables etc. Thereto preferably a pair of hand-scissors is used. Prior art scissors are, due to the very high hardness of the fibres involved, already after some cutting operations utterly unusable.
[0004] Even the cutting of domestic paper containing fibres gives problems in connection with the rapid blunting of a pair of hand-scissors.
[0005] In order to increase their effective life, prior art pairs of hand-scissors usually have the cutting angle of the cutting edges chosen to be only a little less than 90°. This causes the effectiveness of the cutting operation to be not very great, so that a relatively large cutting force has to be exerted with the hand.
[0006] Purpose of the invention is to relieve the mentioned disadvantages and limitations of the prior art and in view thereof the invention provides a pair of hand-scissors of the type described, which is characterized in that said cutting edges consist of tungsten-carbide and in that the cutting angle of said cutting edges is less than 50°.
[0007] In order to avoid that the pair of scissors according to the invention will become too expensive by making the blades including the cutting edges fully of hard-metal tungsten-carbide advantageously the cutting edges may be made in the form as strips adhered to said blades. In this case e.g. the cutting edges are adhered to said blades by hard-soldering. Also other connecting methods may be used.
[0008] The invention will now be explained with reference to the drawing of two preferred embodiments.
[0009] The drawings show:
Fig. 1 a perspective view of a pair of hand-scissors;
Fig. 2 a section along the line II-II in Fig. 1;
Fig. 3 a perspective view of a variant; and
Fig. 4 a perspective view of the variant according to Fig. 3 seen from the other side.
[0010] Fig. 1 shows a pair of hand-scissors 1, comprising two relatively, round a pivot-shaft 2 pivotable blades 3, 4 having cooperating cutting edges, 5 and 6, respectively, in which hand-grips 7, 8 are present at the end directed away from the cutting edges 5, 6 relatively to the pivot-shaft 2.
[0011] The cutting edges 5, 6 comprise strips 9, 10 of tungsten-carbide. The strips 9, 10 are in the way shown in Fig. 2 embedded in blades 3, 4 and connected therewith by hard-soldering, in such a way that they are fully received in the profile.
[0012] At the blade 4 in Fig. 2 the cutting angle 11 is shown. In this embodiment this angle has a value of about 40°.
[0013] The pair of hand-scissors 2 can also comprise blades fully consisting of tungsten carbide. Further the blades may be urged from one another by spring-force, in which, in distinction to the embodiment according to Fig. 1, the operating means can be positioned at the side of the cutting edges relative to the pivot middle-point.
[0014] Fig. 3 shows a so-called one-ring pair of scissors 11 having relatively pivotable blades 12, 13 of synthetic resin, which be means of screws 14, strips 15, 16 of tungsten-carbide are connected. These strips 15, 16 carry cutting edges 17, 18 respectively.
[0015] The blade 12 carries a ring 19, which is intended to receive the ring-finger, and a flat part 20 for cooperation with the middle-finger and forefinger. The blade 13 carries a flat part 21 intended to receive a pressure exerted thereof by the thumb. Blades 12, 13 are urged away from one another by screw-spring 22 indicated by dotted lines in Fig. 4.
1. A pair of hand-scissors (1), comprising two relatively pivotable blades (3, 4)
having cooperating cutting edges (5, 6) and operating means (7, 8) adapted to be gripped
by the hand, characterized in that said cutting edges (5, 6) consist of tungsten-carbide
and in that
the cutting angle (11) of said cutting edges (5, 6) is less than 50°.
the cutting angle (11) of said cutting edges (5, 6) is less than 50°.
2. The pair of hand-scissors according to claim 1, characterized in that said cutting
edges (17, 18) are in the form of strips (15, 16) adhered to said blades (12, 13).
3. The pair of hand-scissors according to claim 2, characterized in that said cutting
edges (17, 18) are adhered to said blades (12, 13) by hard-soldering.
1. Handschere (1), welche zwei relativ drehbare Klingen (3, 4) aufweist, die zusammenwirkende
Schneidkanten (5, 6) und Bedienungseinrichtungen (7, 8) hat, die eingerichtet sind,
von der Hand ergriffen zu werden, dadurch gekennzeichnet, daß die Schneidkanten (5,
6) aus Wolframkarbid bestehen und daß der Scheidwinkel (11) der Schneidkanten (5,
6) weniger als 50° beträgt.
2. Handschere nach Anspruch 1, dadurch gekennzeichnet, daß der Schneidkanten (17,
18) die Form von an den Klingen (12, 13) befestigten Streifen (15, 16) haben.
3. Handschere nach Anspruch 2, dadurch gekennzeichnet, daß die Schneidkanten (17,
18) an den Klingen (12, 13) durch Hartlöten befestigt sind.
1. Pair de ciseaux à main (1) comprenant deux lames (3, 4) qui prevent pivoter l'une
par rapport à l'autre et qui présentent des artêtes de coupe (5, 6) qui coopèrent
et des moyens de manoeuvre (7, 8) pouvant être saisis à l'aide de la main, caractérisé
en ce que les arêtes de coupe (5, 6) sont constituées de carbure de tungstène et en
ce que l'angle de coupe (11) de ces arêtes de coupe (5, 6) est inférieur à 50°.
2. Paire de ciseaux à main conforme à la revendication 1, caractérisée en ce que lesdites
arêtes de coupe (17, 18) se présentent sous la forme de bandes (15, 16) collées sur
les dites lames (12, 13)..
3. Paire de ciseaux à main conforme à la revendication 2, caractérisée en ce que lesdites
arêtes de coupe (17, 18) sont collées sur lesdites lames (12, 13) par brasage fort.