EP0092835B1 - Cutting device - Google Patents

Cutting device Download PDF

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Publication number
EP0092835B1
EP0092835B1 EP83104047A EP83104047A EP0092835B1 EP 0092835 B1 EP0092835 B1 EP 0092835B1 EP 83104047 A EP83104047 A EP 83104047A EP 83104047 A EP83104047 A EP 83104047A EP 0092835 B1 EP0092835 B1 EP 0092835B1
Authority
EP
European Patent Office
Prior art keywords
cutting
cutting device
blade
contact
contact pieces
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
EP83104047A
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German (de)
French (fr)
Other versions
EP0092835A1 (en
Inventor
Helmut Wenger
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.)
Helmut Wenger Te Kranzberg Bondsrepubliek Duitsla
Original Assignee
Wenger Helmut
ZANGL GmbH
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Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6161967&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0092835(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Wenger Helmut, ZANGL GmbH filed Critical Wenger Helmut
Priority to AT83104047T priority Critical patent/ATE18739T1/en
Publication of EP0092835A1 publication Critical patent/EP0092835A1/en
Application granted granted Critical
Publication of EP0092835B1 publication Critical patent/EP0092835B1/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/08—Means for treating work or cutting member to facilitate cutting
    • B26D7/10—Means for treating work or cutting member to facilitate cutting by heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F3/00—Severing by means other than cutting; Apparatus therefor
    • B26F3/06—Severing by using heat
    • B26F3/08—Severing by using heat with heated members
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/03—Heaters specially adapted for heating hand held tools
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/283—With means to control or modify temperature of apparatus or work
    • Y10T83/293—Of tool

Definitions

  • the invention relates to an electrically heated cutting device for cutting rubber and plastics with a current-carrying knife made of flat material, which is essentially U-shaped with two legs, the free ends of which are connected to the two poles of a supply current source.
  • the knife In a known cutting device of this type (DE-B 1 943189), the knife is designed in the form of a flat, U-shaped blade running in the cutting direction, the legs of which end in the connecting region with a V-shaped or acute-angled cutting edge.
  • the knife is made of flat material, and to achieve the acute-angled cutting edge, this flat material is bent perpendicular to its plane.
  • Such a cutting device enables waste-free cutting of rubber and plastics, provided the cutting point or the cutting line is freely accessible. In the case of cutting points which are difficult to access, for example when cutting out the glued windows of motor vehicles, the use of this known knife is difficult, if not impossible.
  • a cutting device is also known (DE-B 1515 265), in which a knife attached to the ends of electrode rods has a V-shaped blade, which is also made of flat material, but is bent in a V-shape on its own plane. At the free ends of this V-shaped knife, legs which are adapted to a bevel of the electrode rods are fastened, so that the overall result is a W-shaped shape of the knife.
  • this knife is also not suitable for cutting at difficult-to-reach cutting points, but is preferably used for cutting off the sprue cones.
  • the invention has for its object to provide a cutting device of the type mentioned, which also enables the cutting of material in hard-to-reach places.
  • the cutting device Due to its angled shape, the cutting device according to the invention enables cutting even in hard-to-reach places, for example cutting out glued windows of motor vehicles, with the greatest heating occurring on the leg lying in front in the cutting direction in its bending region and adjacent to it.
  • This is particularly advantageous when cutting out glued window panes, since in the bending area, i.e. H.
  • a material accumulation occurs during cutting, which leads to rapid heat dissipation and thus to cooling of the knife in an area which should just be at the highest temperature.
  • the heat distribution can be controlled very precisely by reducing the width of the leg at this point and / or at other points where increased heat dissipation occurs, depending on the application.
  • a cooling device which cools the part of the knife lying outside the cutting area, so that a further heat concentration occurs on the cutting area itself, since the hotter areas of the knife have a greater resistance.
  • the cutting device is preferably fed via lines connected to a supply current source, since otherwise the weight of the cutting device itself would become too great if a transformer were arranged in the cutting device.
  • This requires switching the power supply of the knife in the circuit of the knife itself, i. H. on the secondary side of a transformer forming the supply current source.
  • the switch is preferably designed in the form of an actuating lever which is biased in the direction of switching off and which carries a contact plate which is provided at one end with a contact which interacts with a fixed contact.
  • This contact is connected, for example, to the feed line, and in this case the contact plate itself is connected to the one contact piece via a flexible wire. In this way, the two current transitions via contact surfaces required for other switches are avoided.
  • the cooling device can preferably be switched on and off depending on the actuation of the switch, for which purpose known detectors are provided for the voltage drop along the secondary winding of the transformer and / or the current flowing on the secondary side.
  • recesses can be provided in the contact pieces in the area between the housing and the clamping plates clamping the knife, which reduce the heat transfer.
  • the contact pieces are prestressed in one direction away from the cutting knife in their longitudinal direction in order to compensate for the greater thermal expansion of the leg of the knife which has more heat and has the cutting edge.
  • the leg of the knife carrying the cutting edge is attached to the associated contact piece clamped while this contact piece is pulled out of the housing against the action of the bias.
  • both contact pieces are resiliently biased into the interior of the housing, so that the cutting direction of the cutting device with respect to the housing or the position of the switch can be selected as desired.
  • the cutting device can have a carrier arranged in the middle in the form of a rod with a rectangular or square cross section made of heat-resistant insulating material, which is provided in the front area of the housing with grooves running in the axial direction, in which extensions of the contact pieces can slide.
  • These extensions of the contact pieces have elongated holes, through which bolts fastened in the carrier run, on which washers and nuts are placed above the extensions of the contact pieces, which are tightened to such an extent that the extensions of the contact pieces can be moved in the grooves of the carrier becomes.
  • the contact pieces are connected to the feed lines via flexible strands that do not hinder the movement of the contact pieces.
  • the housing When using a substantially centrally arranged carrier, the housing can be designed as a sleeve and pushed over the carrier, so that the housing can be fastened to the narrow sides of the carrier by screws which are screwed into threaded holes in the carrier. This results in a very compact and robust structure that enables very high cutting forces.
  • FIGS. 1 and 2 The embodiment of the electrically heated cutting device shown in FIGS. 1 and 2 has a housing 1 to which contact pieces 2 are fastened, which interact with clamping plates 3 in order to clamp a knife 6.
  • the clamping plates 3 are pressed with the aid of screws 4, 5 against the knife resting on the contact pieces 2 and result in a secure electrical contact.
  • Electrical feed lines 9, 10 and a hose 11 extend through the housing and feed a cooling device 7 to be explained with cooling air.
  • the feed line 9 is connected directly to the one contact piece 2, while the other feed line 10 can be connected to the other contact piece 2 via a switch which can be actuated by an actuating lever 8.
  • the switch consists of a contact plate 11 embedded in the actuating lever 8, which is connected to the associated contact piece 2 via a flexible wire 12 and has a contact., Which is connected to a fixed contact 13 Actuation of the actuating lever can be brought into contact.
  • the actuating lever is biased by a spring 14 such that the circuit from the feed line 10 to the associated contact piece 2 is interrupted.
  • the knife 6 extends the free end of a cooling tube 7 which is provided with air outlet openings directed towards the clamping plates and the knife.
  • cooling air is fed into the cooling tube 7 via the hose 11, so that parts of the knife 6 which are not in cutting engagement are cooled.
  • the areas of the knife that are outside the actual interface are kept at a low temperature, so that due to the increase in resistance in the other areas of the knife, the heat output is concentrated in these other areas.
  • the knife 6 has an angled section 6a which can run at any angle to the rest of the area of the knife.
  • the case of a right-angled bend shown in the drawings represents only a special case which is suitable, for example, for the application case already mentioned of cutting out glued motor vehicle windows.
  • the width of the leg 6b of the knife lying in front in the cutting direction is reduced in the bend area and adjacent thereto, so that a heat concentration occurs here. This is particularly advantageous because a material accumulation occurs in this area during cutting, which results in a comparatively greater heat dissipation.
  • this reduction can the width in addition to the bending area at other areas of the front leg in the cutting direction, so that a corresponding adaptation of the knife to the cutting conditions and the heat dissipation occurring is possible.
  • the reduction in the width results in a cutting tip in the bent region 6a, which facilitates the penetration of the knife into the material to be cut.
  • the bent region 6a connecting the two legs 6b and 6c of the knife can either be of an isosceles acute angle or asymmetrical in accordance with FIG. 4b, as shown in FIG. 3b, depending on the application.
  • the contact pieces 2 are provided with cutouts, which are shown in FIG. 2 as circular openings 15. These openings 15 significantly reduce the heat transfer through the contact pieces, but do not lead to a substantial increase in the resistance of the contact pieces, the dimensions of which are mainly determined by the mechanical stresses that occur during cutting. These bores 15, in particular in connection with the cooling air from the cooling tube 7, result in a substantial reduction in the heating of the housing 1.
  • the feeding of the cooling air into the hose 11 can be controlled as a function of the actuation of the switch via the feed circuit of the knives, whereby the supply of cooling air can be interrupted if necessary or the amount reduced.
  • FIGS. 5 to 8 show a further embodiment of the cutting device which is suitable for use with straight as well as curved knives.
  • This embodiment of the cutting device differs from the embodiment described above according to FIGS. 1 and 2 in particular in that the contact pieces 2a are not fastened to the housing 1a itself, but rather are slidably on a carrier 100 which is arranged essentially centrally in the housing 1a is, are led.
  • this carrier has a square, for example rectangular.
  • the extensions 101 self-locking nuts 104 are screwed onto the bolts 103, wherein sliding washers are arranged between the nuts 104 and the extensions 101, which enable the extensions 101 to be displaced in the longitudinal direction.
  • the extensions 101 On their ends facing away from the contact pieces 2a, the extensions 101 have longitudinal bores 107 which open into the rear elongated hole 101a. Springs are inserted into these longitudinal bores 107, which are supported at their rear ends by flexible strands 12a and 12b fastened in the extensions 101. The front end of these springs 107 is supported against the respective bolts 103, so that the contact pieces are biased towards the rear into the housing.
  • the cutting knife is clamped with the aid of the clamping plates 3a and the screws 4 in such a way that the contact piece carrying the cutting leg of the knife is pulled out of the housing against the pretension of the spring 107, so that the leg having the cutting edge is also at a due to the heating caused expansion by the action of the spring 107 is always kept taut and a flawless clean cut is possible.
  • the free ends of the flexible strands 12a. 12b are fastened in a contact plate 11a forming part of the switch or in a fixed connecting piece 13b.
  • the contact plate 11a forms part of the switch already described, which, however, is also modified compared to the embodiment according to FIGS. 1 and 2.
  • the actuating lever 8a is fastened to the contact plate 11a via a spring leaf 110 and two screws 111, 112, the screw 111 being screwed through a hole in the spring leaf into a threaded hole in the actuating lever 8a while the screw 112 is screwed through an elongated hole in the spring leaf into the contact plate 11a.
  • This configuration of the switch enables a further movement of the actuating lever 8a after the contacts on the contact plate 11a or a connecting piece 13a carrying the fixed contact is closed, so that a further improvement in the contact is achieved.
  • the contact plate 11 is pivotably mounted in a U-shaped bracket 120 with the aid of a screw 121.
  • the bracket 120 like all other components of the cutting device, is held on the carrier 100.
  • the feed lines 9 and 10 are screwed to the connecting pieces 13a, 13b.
  • the carrier 100 furthermore has threaded bores 105 which are offset by 90 ° around the longitudinal axis in relation to the extensions 101 of the contact pieces 2a, 2b and are used for fastening the sleeve-shaped housing 1a.
  • This housing has a recess 113 which is largely adapted to the outline of the actuating lever 8a of the switch.
  • the actuating lever 8a has a rounded edge at its front end, which can engage with a narrow side of the recess 113 under the action of a cam. In this way, the cutting device can be operated in continuous operation without actuating the actuating lever 8a.
  • the circular openings 15 of the embodiment according to FIG. 2 are replaced by a large number of smaller bores 15a in the contact pieces 2a. This results in an increased strength with low heat conduction to the handle.
  • the embodiment according to fig. 7 also shows an embodiment of a cooling device 7a in the form of a bent tube with openings which are directed towards the legs of the cutting knife.
  • this curved cooling air tube in the interior of the housing 1a can be provided with small bores 117 which guide part of the air flow into the interior of the housing of the handle and cool it, so that it is pleasant even in continuous operation Handling is guaranteed.

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Details Of Cutting Devices (AREA)
  • Knives (AREA)
  • Confectionery (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Scissors And Nippers (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

An electrically heated excising or cutting tool for cutting rubber, plastic, and the like includes a handle carrying at one end a cutting blade of flat resistive material through which current flows to produce heat. The blade is substantially U-shaped with limbs having free ends clamped to contact pieces on the handle connected to the poles of a power supply. The blade is bent at right angles to the plane of the flat material in the region between the free ends of the limbs and the bight portion of the U-shaped blade to define a cutting region having a first limb disposed in a cutting direction from the second limb. The first limb is reduced in cross-sectional area at the bend to increase the production and concentration of heat in the cutting region to counteract the increased heat dissipation in the cutting region caused by the accumulation of excised material thereat. A cooling device is provided on the handle for cooling the parts of the blade away from the cutting region to reduce the transfer of heat to the handle and to simultaneously result in an increase in heat generation in the cutting portion of the blade due to the increase in electrical resistance in that region. The contact pieces are provided with openings to further reduce heat transfer to the handle.

Description

Die Erfindung bezieht sich auf ein elektrisch beheiztes Schneidgerät zum Schneiden von Gummi und Kunststoffen mit einem aus Flachmaterial bestehenden stromdurchflossenen Messer, das im wesentlichen U-förmig mit zwei Schenkeln ausgebildet ist, deren freie Enden mit den beiden Polen einer Speisestromquelle verbunden sind.The invention relates to an electrically heated cutting device for cutting rubber and plastics with a current-carrying knife made of flat material, which is essentially U-shaped with two legs, the free ends of which are connected to the two poles of a supply current source.

Bei einem bekannten Schneidgerät dieser Art (DE-B 1 943189) ist das Messer in Form einer ebenen, in Schneidrichtung verlaufenden U-förmigen Klinge ausgebildet, deren Schenkel im Verbindungsbereich mit einer V-förmigen oder spitzwinkligen Schneidkante enden. Hierbei ist das Messer aus Flachmaterial hergestellt, und zur Erzielung der spitzwinkligen Schneidkante ist dieses Flachmaterial senkrecht zu seiner Ebene abgebogen. Ein derartiges Schneidgerät ermöglicht ein abfallfreies Schneiden von Gummi und Kunststoffen, sofern die Schneidstelle bzw. die Schnittlinie frei zugänglich ist. Bei schwerzugänglichen Schneidstellen, beispielsweise beim Heraustrennen von geklebten Scheiben von Kraftfahrzeugen, ist die Anwendung dieses bekannten Messers schwierig, wenn nicht sogar unmöglich.In a known cutting device of this type (DE-B 1 943189), the knife is designed in the form of a flat, U-shaped blade running in the cutting direction, the legs of which end in the connecting region with a V-shaped or acute-angled cutting edge. Here, the knife is made of flat material, and to achieve the acute-angled cutting edge, this flat material is bent perpendicular to its plane. Such a cutting device enables waste-free cutting of rubber and plastics, provided the cutting point or the cutting line is freely accessible. In the case of cutting points which are difficult to access, for example when cutting out the glued windows of motor vehicles, the use of this known knife is difficult, if not impossible.

Es ist weiterhin ein Schneidgerät bekannt (DE-B 1515 265), bei dem ein an den Enden von Elektrodenstäben befestigtes Messer eine V-förmige Klinge aufweist, die ebenfalls aus Flachmaterial besteht, jedoch in seiner eigenen Ebene V-förmig gebogen ist. An den freien Enden dieses V-förmigen Messers sind an eine Abschrägung der Elektrodenstäbe angepaßte Schenkel befestigt, so daß sich insgesamt eine W-förmige Form des Messers ergibt. Dieses Messer ist jedoch ebenfalls nicht zum Schneiden an schwerzugänglichen Schneidstellen geeignet, sondern dient vorzugsweise zum Abschneiden von vorstehenden Angußkegeln.A cutting device is also known (DE-B 1515 265), in which a knife attached to the ends of electrode rods has a V-shaped blade, which is also made of flat material, but is bent in a V-shape on its own plane. At the free ends of this V-shaped knife, legs which are adapted to a bevel of the electrode rods are fastened, so that the overall result is a W-shaped shape of the knife. However, this knife is also not suitable for cutting at difficult-to-reach cutting points, but is preferably used for cutting off the sprue cones.

Der Erfindung liegt die Aufgabe zugrunde, ein Schneidgerät der eingangs genannten Art zu schaffen, das auch das Schneiden von Material an schwerzugänglichen Stellen ermöglicht.The invention has for its object to provide a cutting device of the type mentioned, which also enables the cutting of material in hard-to-reach places.

Diese Aufgabe wird durch die im kennzeichnenden Teil des Anspruchs 1 angegebenen Merkmale gelöst.This object is achieved by the features specified in the characterizing part of claim 1.

Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den UnteransprĂĽchen.Advantageous refinements and developments of the invention result from the subclaims.

Das erfindungsgemäße Schneidgerät ermöglicht aufgrund seiner abgewinkelten Form das Schneiden selbst an schwerzugänglichen Stellen, beispielsweise das Ausschneiden von verklebten Scheiben von Kraftfahrzeugen, wobei die stärkste Erhitzung an dem in Schneidrichtung vorn liegenden Schenkel in dessen Biegungsbereich und benachbart hierzu auftritt. Dies ist insbesondere bei dem Ausschneiden von verklebten Fensterscheiben vorteilhaft, da hierbei im Biegungsbereich, d. h. in der Kante des die Scheibe aufnehmenden Falzes, beim Schneiden eine Materialanhäufung auftritt, die zu einer raschen Wärmeabfuhr und damit zu einer Abkühlung des Messers in einem Bereich führt, der gerade die höchste Temperatur aufweisen sollte. Durch die Verringerung der Breite des Schenkels an dieser Stelle und/oder an anderen Stellen, an denen je nach Anwendungsfall eine vergrößerte Wärmeabfuhr auftritt, kann die Wärmeverteilung sehr genau gesteuert werden.Due to its angled shape, the cutting device according to the invention enables cutting even in hard-to-reach places, for example cutting out glued windows of motor vehicles, with the greatest heating occurring on the leg lying in front in the cutting direction in its bending region and adjacent to it. This is particularly advantageous when cutting out glued window panes, since in the bending area, i.e. H. In the edge of the fold receiving the disc, a material accumulation occurs during cutting, which leads to rapid heat dissipation and thus to cooling of the knife in an area which should just be at the highest temperature. The heat distribution can be controlled very precisely by reducing the width of the leg at this point and / or at other points where increased heat dissipation occurs, depending on the application.

Gemäß einer weiteren vorteilhaften Ausgestaltung der Erfindung ist eine Kühlvorrichtung vorgesehen, die den außerhalb des Schneidbereiches liegenden Teil des Messers kühlt, so daß eine weitere Wärmekonzentration auf den Schneidbereich selbst erfolgt, da die heißeren Bereiche des Messers einen größeren Widerstand aufweisen.According to a further advantageous embodiment of the invention, a cooling device is provided which cools the part of the knife lying outside the cutting area, so that a further heat concentration occurs on the cutting area itself, since the hotter areas of the knife have a greater resistance.

Da zu einer ausreichenden Erhitzung des Messers eine erhebliche Leistung erforderlich ist, wird das Schneidgerät vorzugsweise über mit einer Speisestromquelle verbundene Leitungen gespeist, da andernfalls bei Anordnung eines Transformators in dem Schneidgerät selbst das Gewicht des Schneidgerätes zu groß werden würde. Dies setzt ein Schalten der Stromversorgung des Messers im Stromkreis des Messers selbst voraus, d. h. auf der Sekundärseite eines die Speisestromquelle bildenden Transformators. Um Probleme hinsichtlich der Kontaktgabe bei derartig hohen Strömen zu vermeiden, ist der Schalter vorzugsweise in Form eines in Ausschaltrichtung vorgespannten Betätigungshebels ausgebildet, der eine Kontaktplatte trägt, die an einem Ende mit einem Kontakt versehen ist, der mit einem festen Kontakt zusammenwirkt. Dieser Kontakt ist beispielsweise mit der Speiseleitung verbunden, und die Kontaktplatte selbst ist in diesem Fall über eine flexible Litze mit dem einen Kontaktstück verbunden. Auf diese Weise werden die bei anderen Schaltern erforderlichen zwei Stromübergänge über Kontaktflächen vermieden.Since considerable power is required to adequately heat the knife, the cutting device is preferably fed via lines connected to a supply current source, since otherwise the weight of the cutting device itself would become too great if a transformer were arranged in the cutting device. This requires switching the power supply of the knife in the circuit of the knife itself, i. H. on the secondary side of a transformer forming the supply current source. In order to avoid problems with the contact at such high currents, the switch is preferably designed in the form of an actuating lever which is biased in the direction of switching off and which carries a contact plate which is provided at one end with a contact which interacts with a fixed contact. This contact is connected, for example, to the feed line, and in this case the contact plate itself is connected to the one contact piece via a flexible wire. In this way, the two current transitions via contact surfaces required for other switches are avoided.

Die Kühlvorrichtung ist vorzugsweise in Abhängigkeit von der Betätigung des Schalters ein-und ausschaltbar, wobei zu diesem Zweck an sich bekannte Detektoren für den Spannungsabfall längs der Sekundärwicklung des Transformators und/oder den auf der Sekundärseite fließenden Strom vorgesehen sind.The cooling device can preferably be switched on and off depending on the actuation of the switch, for which purpose known detectors are provided for the voltage drop along the secondary winding of the transformer and / or the current flowing on the secondary side.

Um eine Wärmeübertragung von dem Messer auf das Gehäuse des Schneidgerätes so weit wie möglich zu verringern, können weiterhin in den Kontaktstücken im Bereich zwischen dem Gehäuse und den die Messer einklemmenden Klemmplatten Aussparungen vorgesehen sein, die den Wärmeübergang verringern.In order to reduce heat transfer from the knife to the housing of the cutting device as much as possible, recesses can be provided in the contact pieces in the area between the housing and the clamping plates clamping the knife, which reduce the heat transfer.

Gemäß einer weiteren bevorzugten Ausgestaltung der Erfindung sind die Kontaktstücke in einer Richtung von dem Schneidmesser fort in ihrer Längsrichtung vorgespannt, um eine Kompensation der größeren Wärmeausdehnung des sich stärker erwärmenden, die Schneidkante aufweisenden Schenkels des Messers zu erzielen. Der die Schneidkante tragende Schenkel des Messers wird mit Hilfe der Klemmplatte an dem zugehörigen Kontaktstück festgeklemmt, während dieses Kontaktstück gegen die Wirkung der Vorspannung aus dem Gehäuse herausgezogen ist. Um eine beliebige Einspannung der Messer zu ermöglichen, ist hierbei vorzugsweise vorgesehen, daß beide Kontaktstücke elastisch in das Innere des Gehäuses hinein vorgespannt sind, so daß die Schneidrichtung des Schneidgerätes bezogen auf das Gehäuse bzw. die Lage des Schalters beliebig wählbar ist.According to a further preferred embodiment of the invention, the contact pieces are prestressed in one direction away from the cutting knife in their longitudinal direction in order to compensate for the greater thermal expansion of the leg of the knife which has more heat and has the cutting edge. The leg of the knife carrying the cutting edge is attached to the associated contact piece clamped while this contact piece is pulled out of the housing against the action of the bias. In order to enable any clamping of the knives, it is preferably provided that both contact pieces are resiliently biased into the interior of the housing, so that the cutting direction of the cutting device with respect to the housing or the position of the switch can be selected as desired.

Das Schneidgerät kann hierbei einen in der Mitte angeordneten Träger in Form eines Stabes mit rechteckigem oder quadratischem Querschnitt aus wärmebeständigem Isoliermaterial aufweisen, der im vorderen Bereich des Gehäuses mit in Axialrichtung verlaufenden Nuten versehen ist, in denen Verlängerungen der Kontaktstücke gleiten können. Diese Verlängerungen der Kontaktstücke weisen Langlöcher auf, durch die hindurch in dem Träger befestigte Schraubbolzen laufen, auf die oberhalb der Verlängerungen der Kontaktstücke Scheiben und Muttern aufgesetzt sind, die so weit angezogen sind, daß eine Verschiebbarkeit der Verlängerungen der Kontaktstücke in den Nuten des Trägers ermöglicht wird. Die Kontaktstücke sind mit den Speiseleitungen über flexible Litzen verbunden, die die Bewegung der Kontaktstücke nicht behindern.The cutting device can have a carrier arranged in the middle in the form of a rod with a rectangular or square cross section made of heat-resistant insulating material, which is provided in the front area of the housing with grooves running in the axial direction, in which extensions of the contact pieces can slide. These extensions of the contact pieces have elongated holes, through which bolts fastened in the carrier run, on which washers and nuts are placed above the extensions of the contact pieces, which are tightened to such an extent that the extensions of the contact pieces can be moved in the grooves of the carrier becomes. The contact pieces are connected to the feed lines via flexible strands that do not hinder the movement of the contact pieces.

Bei Verwendung eines im wesentlichen mittig angeordneten Trägers kann das Gehäuse als Hülse ausgebildet und über den Träger geschoben sein, so daß das Gehäuse an den Schmalseiten des Trägers durch Schrauben befestigbar ist, die in Gewindebohrungen in dem Träger eingeschraubt sind. Hierdurch ergibt sich ein sehr kompakter und robuster Aufbau, der sehr hohe Schneidkräfte ermöglicht.When using a substantially centrally arranged carrier, the housing can be designed as a sleeve and pushed over the carrier, so that the housing can be fastened to the narrow sides of the carrier by screws which are screwed into threaded holes in the carrier. This results in a very compact and robust structure that enables very high cutting forces.

Die Erfindung wird im folgenden anhand eines in der Zeichnung dargestellten Ausführungsbeispiels noch näher erläutert.The invention is explained in more detail below with reference to an embodiment shown in the drawing.

In der Zeichnung zeigen :

  • Figur 1 eine Seitenansicht einer AusfĂĽhrungsform des Schneidgerätes,
  • Figur 2 eine teilweise geschnittene Draufsicht auf das Schneidgerät gemäß Fig. 1,
  • Figur 3a bis 3d eine erste AusfĂĽhrungsform eines Schneidmessers des Schneidgerätes nach den Fig. 1 und 2,
  • Figur 4a bis 4d eine zweite AusfĂĽhrungsform eines Messers fĂĽr das Schneidgerät gemäß den Fig. 1 und 2,
  • Figur 5 eine teilweise weggebrochen dargestellte Draufsicht auf eine weitere AusfĂĽhrungsform des Schneidgerätes, wobei die obere Hälfte des Gehäuses fortgelassen ist,
  • Figur 6 eine teilweise weggebrochene Längsschnittansicht unter einem rechten Winkel zur Fig. 5,
  • Figur 7 eine der Fig. 5 entsprechende AusfĂĽhrungsform des Schneidgerätes mit einer KĂĽhlvorrichtung,
  • Figur 8 eine Schnittansicht entlang des Linie VIII-VIII nach Fig. 5 bei Betrachtung in Richtung der Pfeile, wobei der Schalter fortgelassen ist.
The drawing shows:
  • FIG. 1 shows a side view of an embodiment of the cutting device,
  • FIG. 2 shows a partially sectioned top view of the cutting device according to FIG. 1,
  • 3a to 3d show a first embodiment of a cutting knife of the cutting device according to FIGS. 1 and 2,
  • 4a to 4d a second embodiment of a knife for the cutting device according to FIGS. 1 and 2,
  • FIG. 5 shows a top view, partially broken away, of a further embodiment of the cutting device, the upper half of the housing being omitted,
  • FIG. 6 shows a partially cut-away longitudinal sectional view at a right angle to FIG. 5,
  • 7 shows an embodiment of the cutting device corresponding to FIG. 5 with a cooling device,
  • 8 shows a sectional view along the line VIII-VIII of FIG. 5 when viewed in the direction of the arrows, the switch being omitted.

Die in den Fig. 1 und 2 gezeigte Ausführungsform des elektrisch beheizten Schneidgerätes weist ein Gehäuse 1 auf, an dem Kontaktstücke 2 befestigt sind, die mit Klemmplatten 3 zusammenwirken, um ein Messer 6 einzuspannen. Die Klemmplatten 3 werden mit Hilfe von Schrauben, 4, 5 gegen das auf den Kontaktstücken 2 aufliegende Messer gedrückt und ergeben einen sicheren elektrischen Kontakt.The embodiment of the electrically heated cutting device shown in FIGS. 1 and 2 has a housing 1 to which contact pieces 2 are fastened, which interact with clamping plates 3 in order to clamp a knife 6. The clamping plates 3 are pressed with the aid of screws 4, 5 against the knife resting on the contact pieces 2 and result in a secure electrical contact.

Durch das Gehäuse hindurch erstrecken sich elektrische Speiseleitungen 9, 10 sowie ein Schlauch 11, der eine noch zu erläuternde Kühlvorrichtung 7 mit Kühlluft speist.Electrical feed lines 9, 10 and a hose 11 extend through the housing and feed a cooling device 7 to be explained with cooling air.

Die Speiseleitung 9 ist direkt mit dem einen Kontaktstück 2 verbunden, während die andere Speiseleitung 10 über einen durch einen Betätigungshebel 8 betätigbaren Schalter mit dem anderen Kontaktstück 2 verbindbar ist. Im Hinblick auf die relativ großen durch das Messer fließenden Ströme besteht der Schalter aus einer in dem Betätigungshebel 8 eingebetteten Kontaktplatte 11, die mit dem zugeordneten Kontaktstück 2 über eine biegsame Litze 12 verbunden ist und einen Kontakt .aufweist, der mit einem festen Kontakt 13 bei Betätigung des Betätigungshebels in Kontakt gebracht werden kann. Der Betätigungshebel ist durch eine Feder 14 derart vorgespannt, daß der Stromkreis von der Speiseleitung 10 zum zugeordneten Kontaktstück 2 unterbrochen wird.The feed line 9 is connected directly to the one contact piece 2, while the other feed line 10 can be connected to the other contact piece 2 via a switch which can be actuated by an actuating lever 8. In view of the relatively large currents flowing through the knife, the switch consists of a contact plate 11 embedded in the actuating lever 8, which is connected to the associated contact piece 2 via a flexible wire 12 and has a contact., Which is connected to a fixed contact 13 Actuation of the actuating lever can be brought into contact. The actuating lever is biased by a spring 14 such that the circuit from the feed line 10 to the associated contact piece 2 is interrupted.

Oberhalb des Messers 6 erstreckt sich das freie Ende eines Kühlrohres 7, das mit auf die Klemmplatten und das Messer gerichteten Luftauslaßöffnungen versehen ist. Im Betrieb wird über den Schlauch 11 Kühlluft in das Kühlrohr 7 eingespeist, so daß nicht in Schneideingriff befindliche Teile des Messers 6 gekühlt werden. Auf diese Weise werden die Bereiche des Messers, die sich außerhalb der eigentlichen Schnittstelle befinden, auf einer niedrigen Temperatur gehalten, so daß aufgrund der Widerstandserhöhung in den übrigen Bereichen des Messers die Wärmeabgabe in diesen anderen Bereichen konzentriert ist.Above the knife 6 extends the free end of a cooling tube 7 which is provided with air outlet openings directed towards the clamping plates and the knife. In operation, cooling air is fed into the cooling tube 7 via the hose 11, so that parts of the knife 6 which are not in cutting engagement are cooled. In this way, the areas of the knife that are outside the actual interface are kept at a low temperature, so that due to the increase in resistance in the other areas of the knife, the heat output is concentrated in these other areas.

Wie dies aus den Fig. 1 und 2 sowie insbesondere aus den Fig. 3a bis 3d und 4a bis 4d zu erkennen ist, weist das Messer 6 einen abgewinkelten Abschnitt 6a auf, der unter einem beliebigen Winkel zum übrigen Bereich des Messers verlaufen kann. Der in den Zeichnungen dargestellte Fall einer rechtwinkligen Abbiegung stellt nur einen Sonderfall dar, der beispielsweise für den bereits genannten Anwendungsfall des Herausschneidens von verklebten Kraftfahrzeugscheiben geeignet ist. Wie dies aus den Fig. 3a und 3b sowie 4a und 4b zu erkennen ist, ist die Breite des in Schneidrichtung vorne liegenden Schenkels 6b des Messers im Biegungsbereich sowie benachbart hierzu verringert, so daß hier eine Wärmekonzentration auftritt. Dies ist insbesondere deshalb vorteilhaft, weil in diesem Bereich beim Schneiden eine Materialanhäufung auftritt, die eine vergleichsweise stärkere Wärmeabfuhr ergibt.As can be seen from FIGS. 1 and 2 and in particular from FIGS. 3a to 3d and 4a to 4d, the knife 6 has an angled section 6a which can run at any angle to the rest of the area of the knife. The case of a right-angled bend shown in the drawings represents only a special case which is suitable, for example, for the application case already mentioned of cutting out glued motor vehicle windows. As can be seen from FIGS. 3a and 3b as well as 4a and 4b, the width of the leg 6b of the knife lying in front in the cutting direction is reduced in the bend area and adjacent thereto, so that a heat concentration occurs here. This is particularly advantageous because a material accumulation occurs in this area during cutting, which results in a comparatively greater heat dissipation.

Selbstverständlich kann diese Verringerung der Breite zusätzlich zum Biegungsbereich an anderen Bereichen des in Schneidrichtung vorn liegenden Schenkels vorgesehen sein, so daß eine entsprechende Anpassung des Messers an die Schneidbedingungen und die hierbei auftretende Wärmeabfuhr möglich ist.Of course, this reduction can the width in addition to the bending area at other areas of the front leg in the cutting direction, so that a corresponding adaptation of the knife to the cutting conditions and the heat dissipation occurring is possible.

Wie dies aus den Fig. 3b und 4b weiterhin zu erkennen ist, ergibt sich durch die Verringerung der Breite eine Schneidspitze in dem abgebogenen Bereich 6a, die das Eindringen des Messers in das zu schneidende Material erleichtert.As can also be seen from FIGS. 3b and 4b, the reduction in the width results in a cutting tip in the bent region 6a, which facilitates the penetration of the knife into the material to be cut.

Der die beiden Schenkel 6b und 6c des Messers verbindende abgebogene Bereich 6a kann in der in Fig. 3b ersichtlichen Weise entweder gleichschenklig spitzwinklig oder gemäß Fig. 4b unsymmetrisch ausgebildet sein, je nach Anwendungszweck.The bent region 6a connecting the two legs 6b and 6c of the knife can either be of an isosceles acute angle or asymmetrical in accordance with FIG. 4b, as shown in FIG. 3b, depending on the application.

Zur Vermeidung eines Wärmeüberganges von dem Messer bzw. von den Kontaktstücken 2 auf das Gehäuse 1 sind die Kontaktstücke 2 mit Aussparungen versehen, die in Fig. 2 als kreisrunde Öffnungen 15 dargestellt sind. Diese Öffnungen 15 verringern den Wärmeübergang durch die Kontaktstücke erheblich, führen aber nicht zu einer wesentlichen Vergrößerung des Widerstandes der Kontaktstücke, deren Abmessungen hauptsächlich durch die auftretenden mechanischen Beanspruchungen beim Schneiden bestimmt sind. Diese Bohrungen 15 ergeben, insbesondere in Verbindung mit der Kühlluft aus dem Kühlrohr 7, eine wesentliche Verringerung der Erwärmung des Gehäuses 1. Die Einspeisung der Kühlluft in den Schlauch 11 kann in Abhängigkeit von der Betätigung des Schalters über den Speisestromkreis der Messer gesteuert werden, wobei die Kühlluftzufuhr im ausgeschalteten Zustand gegebenenfalls unterbrochen oder in ihrer Menge reduziert werden kann.To avoid heat transfer from the knife or from the contact pieces 2 to the housing 1, the contact pieces 2 are provided with cutouts, which are shown in FIG. 2 as circular openings 15. These openings 15 significantly reduce the heat transfer through the contact pieces, but do not lead to a substantial increase in the resistance of the contact pieces, the dimensions of which are mainly determined by the mechanical stresses that occur during cutting. These bores 15, in particular in connection with the cooling air from the cooling tube 7, result in a substantial reduction in the heating of the housing 1. The feeding of the cooling air into the hose 11 can be controlled as a function of the actuation of the switch via the feed circuit of the knives, whereby the supply of cooling air can be interrupted if necessary or the amount reduced.

In den Fig. 5 bis 8 ist eine weitere Ausführungsform des Schneidgerätes dargestellt, das sowohl für die Verwendung mit geraden als auch gebogenen Messern geeignet ist. Diese Ausführungsform des Schneidgerätes unterscheidet sich von der vorstehend beschriebenen Ausführungsform nach den Fig. 1 und 2 insbesondere dadurch, daß die Kontaktstücke 2a nicht an dem Gehäuse 1a selbst befestigt sind, sondern gleitend an einem Träger 100, der im wesentlichen mittig in dem Gehäuse 1a angeordnet ist, geführt sind. Dieser Träger weist, wie dies insbesondere aus Fig. 8 zu erkennen ist, einen viereckigen, beispielsweise rechteckigen. Querschnitt auf und ist mit Nuten 106 versehen, in denen Verlängerungen 101 der Kontaktstücke 2a geführt sind. Diese Verlängerungen weisen Langlöcher 101a auf, durch die hindurch Schraubbolzen 103 ragen, die in Gewindebohrungen dem Träger 100 eingeschraubt sind. Oberhalb der Verlängerungen 101 sind auf die Schraubbolzen 103 selbstsichernde Muttern 104 aufgeschraubt, wobei zwischen den Muttern 104 und den Verlängerungen 101 Gleitscheiben angeordnet sind, die eine Verschiebung der Verlängerungen 101 in Längsrichtung ermöglichen. Die Verlängerungen 101 weisen auf ihren von den Kontaktstücken 2a abgewandten Enden Längsbohrungen 107 auf, die in das jeweils hintere Langloch 101a münden. In diese Längsbohrungen 107 sind Federn eingesetzt, die sich an ihren hinteren Enden an in den Verlängerungen 101 befestigten Enden von biegsamen Litzen 12a bzw. 12b abstützen. Das vordere Ende dieser Federn 107 stützt sich gegen die jeweiligen Schraubbolzen 103 ab, so daß die Kontaktstücke nach hinten hin in das Gehäuse hinein vorgespannt werden.5 to 8 show a further embodiment of the cutting device which is suitable for use with straight as well as curved knives. This embodiment of the cutting device differs from the embodiment described above according to FIGS. 1 and 2 in particular in that the contact pieces 2a are not fastened to the housing 1a itself, but rather are slidably on a carrier 100 which is arranged essentially centrally in the housing 1a is, are led. As can be seen in particular from FIG. 8, this carrier has a square, for example rectangular. Cross section on and is provided with grooves 106, in which extensions 101 of the contact pieces 2a are guided. These extensions have elongated holes 101a, through which screw bolts 103 project, which are screwed into threaded holes in the carrier 100. Above the extensions 101, self-locking nuts 104 are screwed onto the bolts 103, wherein sliding washers are arranged between the nuts 104 and the extensions 101, which enable the extensions 101 to be displaced in the longitudinal direction. On their ends facing away from the contact pieces 2a, the extensions 101 have longitudinal bores 107 which open into the rear elongated hole 101a. Springs are inserted into these longitudinal bores 107, which are supported at their rear ends by flexible strands 12a and 12b fastened in the extensions 101. The front end of these springs 107 is supported against the respective bolts 103, so that the contact pieces are biased towards the rear into the housing.

Das Einspannen des Schneidmessers mit Hilfe der Klemmplatten 3a und der Schrauben 4 erfolgt derart, daß das den schneidenden Schenkel des Messers tragende Kontaktstück gegen die Vorspannung der Feder 107 aus dem Gehäuse herausgezogen ist, so daß der die Schneidkante aufweisende Schenkel auch bei einer durch die Erwärmung hervorgerufenen Ausdehnung durch die Wirkung der Feder 107 immer straff gespannt gehalten wird und ein einwandfreier sauberer Schnitt möglich ist.The cutting knife is clamped with the aid of the clamping plates 3a and the screws 4 in such a way that the contact piece carrying the cutting leg of the knife is pulled out of the housing against the pretension of the spring 107, so that the leg having the cutting edge is also at a due to the heating caused expansion by the action of the spring 107 is always kept taut and a flawless clean cut is possible.

Die freien Enden der biegsamen Litzen 12a. 12b sind in einer einen Teil des Schalters bildenden Kontaktplatte 11a bzw. in einem festen AnschluĂźstĂĽck 13b befestigt.The free ends of the flexible strands 12a. 12b are fastened in a contact plate 11a forming part of the switch or in a fixed connecting piece 13b.

Die Kontaktplatte 11a bildet einen Teil des bereits beschriebenen Schalters, der jedoch ebenfalls gegenüber der Ausführungsform nach den Fig. 1 und 2 abgeändert ist. Bei der Ausführungsform nach den Fig. 5 bis 8 ist der Betätigungshebel 8a an der Kontaktplatte 11a über ein Federblatt 110 und zwei Schrauben 111, 112 befestigt, wobei die Schraube 111 durch eine Bohrung in dem Federblatt hindurch in eine Gewindebohrung in dem Betätigungshebel 8a eingeschraubt ist, während die Schraube 112 durch eine Langlochbohrung in dem Federblatt hindurch in die Kontaktplatte 11a eingeschraubt ist. Durch diese Ausgestaltung des Schalters wird eine weitere Bewegung des Betätigungshebels 8a nach dem Schließen der Kontakte an der Kontaktplatte 11 a bzw. einem den festen Kontakt tragenden Anschlußstück 13a ermöglicht, so daß eine weiter Verbesserung der Kontaktgabe erzielt wird.The contact plate 11a forms part of the switch already described, which, however, is also modified compared to the embodiment according to FIGS. 1 and 2. In the embodiment according to FIGS. 5 to 8, the actuating lever 8a is fastened to the contact plate 11a via a spring leaf 110 and two screws 111, 112, the screw 111 being screwed through a hole in the spring leaf into a threaded hole in the actuating lever 8a while the screw 112 is screwed through an elongated hole in the spring leaf into the contact plate 11a. This configuration of the switch enables a further movement of the actuating lever 8a after the contacts on the contact plate 11a or a connecting piece 13a carrying the fixed contact is closed, so that a further improvement in the contact is achieved.

Die Kontaktplatte 11 ist wie bei der Ausführungsform nach den Fig. 1 und 2 in einem U-förmigen Bügel 120 mit Hilfe einer Schraube 121 schwenkbar gelagert. Der Bügel 120 ist bei der Ausführungsform nach den Fig. 5 bis 8 ebenso wie alle anderen Bauteile des Schneidgerätes an dem Träger 100 gehaltert.As in the embodiment according to FIGS. 1 and 2, the contact plate 11 is pivotably mounted in a U-shaped bracket 120 with the aid of a screw 121. In the embodiment according to FIGS. 5 to 8, the bracket 120, like all other components of the cutting device, is held on the carrier 100.

Die Speiseleitungen 9 bzw. 10 sind mit den AnschluĂźstĂĽcken 13a, 13b verschraubt.The feed lines 9 and 10 are screwed to the connecting pieces 13a, 13b.

Wie dies aus Fig. 8 zu erkennen ist, weist der Träger 100 weiterhin gegenüber den Verlängerungen 101 der Kontaktstücke 2a, 2b um die Längsachse herum um 90° versetzte Gewindebohrungen 105 auf, die zur Befestigung des hülsenförmig ausgebildeten Gehäuses 1a dienen. Dieses Gehäuse weist eine Aussparung 113 auf, die weitgehend dem Umriß des Betätigungshebels 8a des Schalters angepaß ist. Durch Lösen der Schraube 112, Drücken des Betätigungshebels 8a zum Schließen des Schalters und Vorschieben des Betätigungshebels 8a, was durch das Langloch des Federblattes 110 ermöglicht wird, kann der Betätigungshebel 8a im Inneren des Gehäuses 1a arretiert werden. Dies wird dadurch erreicht, daß der Betätigungshebel 8a an seinem vorderen Ende eine abgerundete Kante aufweist, die mit einer Schmalseite der Aussparung 113 unter Nockenwirkung in Eingriff kommen kann. Auf diese Weise kann das Schneidgerät im Dauerbetrieb ohne Betätigung des Betätigungshebels 8a betrieben werden. Wie dies aus Fig. 5 zu erkennen ist, sind die kreisrunden Öffnungen 15 der Ausführungsform nach Fig. 2 durch eine Vielzahl von kleineren Bohrungen 15a in den Kontaktstücken 2a ersetzt. Hierdurch ergibt sich eine vergrößerte Festigkeit bei geringer Wärmeleitung zum Handgriff hin.As can be seen from FIG. 8, the carrier 100 furthermore has threaded bores 105 which are offset by 90 ° around the longitudinal axis in relation to the extensions 101 of the contact pieces 2a, 2b and are used for fastening the sleeve-shaped housing 1a. This housing has a recess 113 which is largely adapted to the outline of the actuating lever 8a of the switch. By loosening screw 112, pressing the actuator lever 8a for closing the switch and advancing the actuating lever 8a, which is made possible by the elongated hole of the spring leaf 110, the actuating lever 8a can be locked inside the housing 1a. This is achieved in that the actuating lever 8a has a rounded edge at its front end, which can engage with a narrow side of the recess 113 under the action of a cam. In this way, the cutting device can be operated in continuous operation without actuating the actuating lever 8a. As can be seen from FIG. 5, the circular openings 15 of the embodiment according to FIG. 2 are replaced by a large number of smaller bores 15a in the contact pieces 2a. This results in an increased strength with low heat conduction to the handle.

Die Ausführungsform nach fig. 7 zeigt weiterhin eine Ausführungsform einer Kühlvorrichtung 7a in Form eines gebogenen Rohres mit Öffnungen, die auf die Schenkel des Schneidmessers gerichtet sind. Wie dies in Fig. 7 schematisch angedeutet ist, kann dieses gebogene Kühlluftrohr im Inneren des Gehäuses 1a mit kleinen Bohrungen 117 versehen sein, die einen Teil des Luftstromes in das Innere des Gehäuses des Handgriffes leiten und dieses kühlen, so daß auch im Dauerbetrieb eine angenehme Handhabung gewährleistet ist.The embodiment according to fig. 7 also shows an embodiment of a cooling device 7a in the form of a bent tube with openings which are directed towards the legs of the cutting knife. As indicated schematically in Fig. 7, this curved cooling air tube in the interior of the housing 1a can be provided with small bores 117 which guide part of the air flow into the interior of the housing of the handle and cool it, so that it is pleasant even in continuous operation Handling is guaranteed.

Claims (12)

1. Electrically heated cutting device for cutting rubber and plastics, comprising a blade through which current flows and which consists of flat material and which in the plane of the flat material is made substantially U-shaped with two legs whose free ends are connected to the two poles of a supply current source, characterized in that the portion of the flat blade (6) carrying the cutting edge in a region lying between the free ends of the legs (6b, 6c) and the connecting region is bent out of the plane of the blade and that the leg (6b) lying at the front in the cutting direction comprises in the bend region and adjacent thereto a reduced width.
2. Cutting device according to claim 1, characterized in that the bend of the blade extends substantially at right-angles.
3. Cutting device according to claim 1 or 2, characterized in that the cutting device comprises a housing (1) with contact pieces (2) which are connected to the lines (9, 10) connected to the supply current source and that the free ends of the legs (6b, 6c) of the blade (6) are pressed via clamping plates (3) onto the contact pieces (2).
4. Cutting device according to any one of the preceding claims, characterized in that a cooling means (7) is provided for cooling the contact pieces (2) and the legs (6b, 6c) of the blade (6).
5. Cutting device according to claim 4, characterized in that the cooling means is formed by a tube (7) which extends transversely of the longitudinal direction of the legs (6b, 6c), comprises bores directed towards the legs and is fed from a cooling air source.
6. Cutting device according to claim 4 or 5, characterized in that the cooling air source is adapted to be switched on and off in dependence upon the actuation of a switch (8, 11, 12, 13) closing the circuit through the blade (6).
7. Cutting device according to any one of the preceding claims, characterized in that in the housing (1) a switch (8, 11, 12, 13) is disposed which is connected into at least one of the supply lines (9, 10) and which comprises a contact plate (11) which is embedded in an actuating lever (8) and which via a flexible stranded wire (12) is connected to a contact piece (2) or the supply line and that the contact plate (11) has a contact which on actuation of the actuating lever is brought into contact with a fixed contact (13) which is connected to the supply line or the contact piece (2).
8. Cutting device according to any one of the preceding claims, characterized in that in the contact pieces (2) in the region lying outside the housing (1) between said housing (1) and the clamping plates (3) recesses (15) are disposed which reduce the conduction of heat from the blade (6) to the housing (1).
9. Cutting device according to any one of claims 3 to 8, characterized in that the contact pieces (2a) are biased in a direction away from the blade (6).
10. Cutting device according to claim 9, characterized in that the contact pieces (2a) comprise extensions (101) which are guided slidingly in opposite grooves (106) of a support (100).
11. Cutting device according to claim 10, characterized in that the extensions (101) are provided with elongated slots (101a) through which bolts (103) screwed into the support (100) extend and that onto the ends projecting from the extensions (101) nuts (104) are screwed which bear against the exposed surface of the extensions (101) of the contact pieces (2a).
12. Cutting device according to any one of claims 9 to 11, characterized in that the support (100) comprises securing bores (105) for a sleeve- shaped housing (1a).
EP83104047A 1982-04-26 1983-04-25 Cutting device Expired EP0092835B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83104047T ATE18739T1 (en) 1982-04-26 1983-04-25 CUTTER.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3215503 1982-04-26
DE3215503A DE3215503A1 (en) 1982-04-26 1982-04-26 ELECTRICALLY HEATED CUTTER

Publications (2)

Publication Number Publication Date
EP0092835A1 EP0092835A1 (en) 1983-11-02
EP0092835B1 true EP0092835B1 (en) 1986-03-26

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EP83104047A Expired EP0092835B1 (en) 1982-04-26 1983-04-25 Cutting device

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US (1) US4539467A (en)
EP (1) EP0092835B1 (en)
JP (1) JPS591200A (en)
AT (1) ATE18739T1 (en)
DE (2) DE3215503A1 (en)

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Also Published As

Publication number Publication date
EP0092835A1 (en) 1983-11-02
ATE18739T1 (en) 1986-04-15
DE3362658D1 (en) 1986-04-30
JPS591200A (en) 1984-01-06
DE3215503A1 (en) 1983-11-03
US4539467A (en) 1985-09-03

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