EP0286837B1 - Unité de coupe - Google Patents

Unité de coupe Download PDF

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Publication number
EP0286837B1
EP0286837B1 EP88103837A EP88103837A EP0286837B1 EP 0286837 B1 EP0286837 B1 EP 0286837B1 EP 88103837 A EP88103837 A EP 88103837A EP 88103837 A EP88103837 A EP 88103837A EP 0286837 B1 EP0286837 B1 EP 0286837B1
Authority
EP
European Patent Office
Prior art keywords
connecting element
knife
cutting surface
blade insert
bore
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
EP88103837A
Other languages
German (de)
English (en)
Other versions
EP0286837A1 (fr
Inventor
Winfried D. Wittek
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.)
Chicago Pneumatic Tool GmbH
Original Assignee
Chicago Pneumatic Tool GmbH
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 Chicago Pneumatic Tool GmbH filed Critical Chicago Pneumatic Tool GmbH
Publication of EP0286837A1 publication Critical patent/EP0286837A1/fr
Application granted granted Critical
Publication of EP0286837B1 publication Critical patent/EP0286837B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25G—HANDLES FOR HAND IMPLEMENTS
    • B25G3/00—Attaching handles to the implements
    • B25G3/34—Attaching handles to the implements by pressing the handle on the implements; using cement or molten metal, e.g. casting, moulding, by welding or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B7/00—Hand knives with reciprocating motor-driven blades

Definitions

  • the invention relates to a knife insert for tools with an oscillating head, preferably of the type used for the separation of rubber or adhesive beads on windshields, with a cutting surface which is delimited by one or more cutting edges, the knife being perpendicular to its cutting surface Is angled in an L-shape, the cutting surface forms a first L-leg and the second L-leg, which extends essentially vertically from the cutting surface, has a connecting element for connection to an actuating tool.
  • Knives of this type generally have a flat, possibly slightly spherical cutting surface and, in operation, are attached to an oscillating head which carries out very rapidly oscillating rotary movements over a small angular range.
  • the knife is attached to a spindle serving as a tool holder, which in turn is attached to the head of the tool or drive assembly so as to be rotatable about the small angular range mentioned.
  • Knives are known which are either Z-shaped or U-shaped in the side view, one leg of the U or the Z forming the cutting surface or cutting edge, while the knife is fastened to the tool carrier or the spindle with the other leg has been.
  • the intermediate piece connecting the two legs and extending essentially perpendicular to them serves above all to be able to use the knife even in inaccessible places, such as for car windscreens between the support surface in the window frame and the windshield itself.
  • the connection area was also made of the shaft correspondingly complex and expensive and it was generally used for the manufacture of the shaft much more material than for the manufacture of the cutting part of the knife.
  • the material properties mentioned, which are important for the cutting edge are only of minor importance for the shaft. Only a certain strength is required for small construction measures, since the knife is exposed to considerable loads during operation.
  • the axis of rotation is far away from the shaft part which extends perpendicularly from the cutting edge.
  • This part also performs the oscillatory rotary movements with a stroke of a few mm.
  • this creation part lies exactly between the edge of the windshield and the vehicle frame. The oscillating rotary movements of this shaft part can damage the vehicle frame and / or the windshield.
  • a knife insert of the type described in the introduction is known from US-A-4,215,475.
  • the invention is based on this.
  • this known knife insert proves to be disadvantageous in various respects. Due to the screw connection to the drive shaft, the knife is only laborious and time-consuming to change using two screws.
  • the drive shaft, which sets the knife in oscillatory motion is of relatively large volume due to the screw connection and impairs accessibility to the workpiece, in particular when cutting rubber or adhesive beads in the corner areas of the windshields.
  • the problem may arise that the screw fastening loosens over time at the relatively high oscillation frequencies of the knife insert, and problems arise with regard to the safety and functionality of the known device.
  • the knife insert should be inexpensive to manufacture by using different materials for the knife and the connecting element.
  • the object of the invention is to further develop the known knife insert in such a way that an improvement in the properties of use and the functionality is ensured while at the same time being inexpensive to produce
  • the large-area welding has the advantage of sufficient strength of the connection between the L-shaped knife and the connecting element. This connection is exposed to considerable loads during the operation of the tool.
  • the tool oscillates very quickly, for example at 25,000 strokes per minute. Simply because of the inertia of the L-shaped knife, enormous acceleration forces then occur at the fastening point, which could lead to the breaking of a welded joint along a running weld seam.
  • the dynamic loads are therefore extremely high, especially since, in addition to the inertial forces, the resistance of the knife, which very quickly penetrates into an adhesive bead, has to be overcome during the oscillating movements of the knife insert.
  • the large-area welding also represents a considerably more permanent and safe way of connecting the knife to the connecting element than is possible by screwing. Due to the high oscillation frequency, there is a risk of loosening the screw connections in the known knife insert, whereby the functionality but also the functional reliability can be extremely impaired.
  • the connecting element can be made very tapered.
  • the possibility of a tapering of the drive shaft is limited by the fact that the drive shaft must have a plurality of threaded holes for fastening the knife by means of screws.
  • the drive shaft of the known arrangement does not in itself constitute a connecting element to the actuating tool, but is part of the actuating tool.
  • a connecting element is provided at all, which has a bore or a groove, the groove or bore extending substantially perpendicular to the direction of insertion of the knife insert in the tool holder, the possibility is created of the knife insert in the case replace the wear very quickly.
  • the connecting element is welded to the second L-leg by friction welding.
  • connection is very durable and can be made in a matter of seconds.
  • a material can be selected for the connecting element which is much easier to process than the material from which the knife edge and knife shaft are made, and which can nevertheless be easily welded to the knife shaft.
  • the connecting element is a part with a polygonal cross section. Such a part can be easily non-positively and positively attached to a corresponding receptacle on the tool carrier or the spindle of the device which drives the knife.
  • a four- or six-sided shape of the connecting element is preferred.
  • Four- and six-sided forms are used as standard for the power transmission, so that appropriately prepared raw material can be procured and processed at low prices.
  • one of the surfaces of the connecting element in the connecting region with the shaft can optionally be made larger, so that the usual, regular cross-sectional shape no longer results, but rather the connecting element at least in the region in which it welds to the shaft of the knife is asymmetrically shaped.
  • the octagonal or twelve-sided shape or a wave shape of the surface of the connecting element have proven to be expedient.
  • the polygonal elements need not be regular polygonal shapes.
  • a square can also have two narrow and two wide sides, that is to say the cross section of a sheet metal strip.
  • the second L-leg of the knife insert itself can also form the connecting element 4.
  • this can also be inserted into receptacles of a spindle, which is otherwise provided for regular polygonal shapes, the two narrow sides of the connecting element respectively resting in opposite corners of the polygonal receptacle.
  • a screw connection can also be provided between the connecting element and the tool carrier.
  • the connecting element itself can be designed as a screw which can be screwed into a corresponding thread of the tool carrier or the spindle.
  • the symmetrical polygonal connectors have the advantage that the knife insert can be inserted into the spindle rotated by fixed angular amounts. With a regular twelve-sided connection, for example, this angle is 30 °. In the case of a screw connection, the orientation of the knife is generally not so well defined, but can optionally be set as desired using additional holder elements such as lock nuts or the like.
  • the connecting element has a bore or a groove which extends substantially perpendicular to the direction of insertion of the connecting element into the tool carrier.
  • a groove can, for example, be arranged at a fixed axial height along the entire circumference of the connecting element, so that an axial holding of the connecting element by parts engaging in the groove is independent of the orientation in which the knife insert or the connecting element is inserted into the spindle .
  • a locking pin to be guided through a suitable bore in the tool carrier can be inserted into the groove or bore.
  • the knife insert is secured against axial displacement by a locking pin being passed through a bore in the tool carrier, which is at the same axial height as the groove of the inserted connecting element.
  • the bore in the tool carrier and the groove or a corresponding bore in the connecting element are arranged relative to one another such that the locking pin also engages in the groove or the bore of the connecting element.
  • the locking pin can in turn be secured against slipping out of the bore by spring elements.
  • the axial securing of the knife is particularly necessary because the drive elements for the knife perform up to 25,000 strokes per minute and a knife slipping out could be thrown at high speed and could injure people.
  • the connecting element is attached to the second L-leg at a distance from the cutting surface.
  • the connecting element which, for example as a square or hexagonal pin, has a significantly larger cross section than the knife shank or the second L-leg, cannot be easily fitted into narrow gaps or slots, e.g. insert between the windshield and the body, so that it is advantageous if the connecting element is attached to the shaft at a distance from the cutting surface, so that the remaining free shaft part allows the knife to be inserted into the inaccessible areas mentioned.
  • connection element tapers in the direction of the cutting surface.
  • the connecting element can additionally be attached to the shaft at a distance from the cutting surface or not.
  • the tapered part then allows a better insertion of the knife and the knife shaft and possibly also parts of the connecting element into the inaccessible areas mentioned.
  • a connecting element is preferred according to the invention, which can be positively inserted into an adapter provided with a screw connection.
  • the plug-in knife inserts can also be attached to a conventional spindle with a screw thread.
  • the new, plug-in knife inserts therefore do not require the replacement of entire drive units, but the conventional drive units can continue to be used, with either only the spindle being replaced or the one mentioned Adapter is screwed onto the conventional spindle by means of a clamping screw.
  • FIG. 1 shows a knife insert 1 with a cutting surface 2 and a shaft 3 to which a connecting element 4 is welded.
  • the connecting element 4 is mounted at a distance from the cutting surface 2 on the shaft 3 and bevelled at its lower left corner, so that it tapers in the direction of the cutting surface 2. In this way, additional space is gained in order to be able to work with the knife in corner areas and similar places that are difficult to access.
  • the connecting element 4 has in its upper third a circumferential, semi-cylindrical groove 5 and, moreover, has the shape of a square rod, as can best be seen in FIG. 2a.
  • the connecting element 4 is not arranged exactly above the cutting surface 2, but is slightly offset.
  • the axis of rotation around which the Knife executes torsional vibrations in operation essentially coincides with the axis of symmetry 8 of the square rod.
  • the knife is balanced overall with respect to the axis of rotation 8, that is to say that the axis of rotation 8 runs through the center of gravity of the knife insert 1. This contributes to a particularly smooth running during the operation of the cutting device.
  • Figure 2b differs from that of Figure 2a only in that the connecting element 4 is arranged over the rear end of the cutting surface 2 and is not laterally offset.
  • 2c, d and e show further knife shapes, the cross section of the connecting element 4 appearing in FIG. 2e in the form of a regular hexagon.
  • a corner of the hexagon is completely milled or ground away, so that the hexagon in the connecting area can be welded to the shaft 3 over a larger area.
  • the knives shown can have cutting edges either only on one side or also on both sides.
  • a spindle 6 can be seen in FIG. 3, which performs rotary movements oscillating about an axis of rotation 9 during operation.
  • the maximum angle of rotation for these movements is generally less than 20 °.
  • the spindle 6 consists of a multiply graduated cylindrical structure, the lower cylinder parts having an enlarged diameter being designed to accommodate a knife insert. It became conventional for the well-known knives a fastening by means of a screw is provided in the thread 10, but the screw was not firmly connected to the knife insert, but merely fixed the knife in a certain position.
  • the spindle 6 described here still leaves such an attachment option open, since in addition to the receptacle 11 with a star-shaped cross section, the thread 10 is provided inside the spindle 6.
  • a conventional knife comes with its fastening part either on the lower surface of the disc 13 or the hexagonal disc 14 to the plant.
  • the hexagon washer 14 also serves to hold the spindle 6 with the aid of a wrench or the like when fastening a knife insert or in other work on the spindle 6.
  • the receptacle 11 for the plug-in knife insert 1 is star-shaped with eight right-angled outer corners, as can best be seen in the view from below shown in FIG. In this way, it is also possible to insert a four-sided connecting element 4, as shown in FIGS. 1 and 2a to 2d, into the receptacle 11.
  • the corners of the square engage in every second corner of the octagonal star 11.
  • the octagonal cross section of the receptacle 11 makes it possible to insert the knife insert 1 into the receptacle 11 rotated by a fixed angle of 45 ° or a multiple thereof.
  • the arrangement of the knife insert 1 can thus be optimally adapted to the given space and working conditions.
  • the knife movement itself is not influenced by the orientation of the connecting element 4 in the receptacle 11, since the axis of symmetry 8 of the connecting element 4 coincides with the axis of rotation 9 of the spindle 6.
  • the disc 13 at the lower end of the spindle 6 also has a bore 7 through which a locking pin 15 can be inserted.
  • the distance of the bore 7 to the upper end face of the receptacle 11, to which the connecting element 4 of the knife insert 1 strikes when inserted, corresponds essentially to the distance of the groove in the connecting element 4 from its upper edge or upper side, which strikes the end face of the receptacle 11.
  • locking pin 15 is inserted into the bore 7 after the connecting element 4 has been inserted into the receptacle 11, the securing pin lies in the groove 5 of the connecting element 4 and thus prevents the connecting element 4 from moving axially or slipping out of the receptacle 11
  • Figure 5 shown locking pin is available in the illustrated embodiment as a ring spring pin in standardized sizes.
  • the second leg 16 of the locking pin 15 engages in a groove 12 provided on the outer edge of the disk 13, the curvature of the second leg 16 also being adapted to the curvature of the disk 13.
  • the leg 16 of the locking pin 15 presses against the outer edge of the groove 12, while the leg 17 of the locking pin 15 is received in the bore 7 of the washer 13 and in the groove 5 of the connecting element 4. In this way, the locking pin 15 cannot slip out of the bore 7 and the groove 5, so that the connecting element 4 or the knife insert 1 are held securely.
  • the bore 7 can be arranged in any manner in the disk 13, as long as only its part lying radially on the inside with respect to the disk 13 is aligned with the groove 5 of an inserted connecting element 4.
  • the spindle 6 shown can thus be used either for the fastening of the hitherto known knives or knife inserts which are U-shaped in side view, as well as for the new plug-in knife inserts 1 according to the present invention.
  • a great advantage of the plug-in knife inserts in combination with the corresponding spindle lies in the fact that the knife inserts can be released very quickly by pulling out the locking pin 15 and removing the connecting element 4 from the receptacle 11 and, if necessary, exchanging them. Especially when work is constantly changing, for example when removing windshields of different types of cars in a repair shop, the possibility of a quick knife change is very advantageous.
  • the thread 10 can be dispensed with
  • the receptacle 11 can have a hexagonal or twelve-sided cross section
  • the connecting element 4 can also be secured in another way against axial displacement, e.g. by a circlip, a snap coupling or the like.
  • the connecting element 4 is arranged on the outside, ie on the side of the second L-leg 3 facing away from the cutting surface.
  • the connecting element 4 could also have a slot in its lower part, the L-leg 3 being received in the slot 3 and being welded there.
  • the axis of rotation 9 can run through the L-leg 3, so that the oscillatory rotary movements of the L-leg 3 thereby have a minimal Have hub.
  • an adapter 20 is shown in a side view.
  • the adapter 20 has a slot 21 for receiving a leg 3 of an L-shaped knife insert 1.
  • the leg 3 of the knife insert 1 can be fastened with a screw in the slot 21 of the adapter 20 in that the screw into the thread 23 of the Bore 22 is screwed in and thereby clamps the leg 3.
  • the leg 3 can have a suitable bore through which such a screw is passed.
  • the leg 3 of the knife insert 1 could also be held in the slot 21 by other clamping elements, in particular the slot could also be formed between a movable part of the adapter 20 and the rest of the adapter part.
  • the adapter 20 is fastened to the spindle 6 with the aid of a screw, the screw being screwed into the thread 10 of the spindle 6.
  • the adapter 20 has a screw head receptacle 24 and a through hole 25.
  • the adapter 20 has a recess 26 for receiving the hexagon washer 14 so that it can be connected to the spindle 6 in a rotationally fixed manner.
  • the adapter 20 can be attached both to the conventional spindles and to the spindles 6, which according to the invention has a receptacle for insertable knife inserts.
  • the adapter 20 is chamfered on the side opposite the slot 21.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Knives (AREA)
  • Milling Processes (AREA)

Claims (8)

  1. Unité de coupe pour outils à tête oscillante, de préférence du type utilisé pour découper des bourrelets ou bavures de caoutchouc ou de colle sur des pare-brise, comportant une surface de coupe qui est limitée par une ou plusieurs arêtes de coupe, l'outil de coupe formant couteau étant recourbé perpendiculairement par rapport à sa surface de coupe (2) selon un L, la surface de coupe (2) constituant une première branche du L et la deuxième branche du L (3) s'étendant perpendiculairement à la surface de coupe (2) et comportant un élément de liaison (4) pour relier celle-ci avec un outil de commande (6) caractérisée en ce que l'élément de liaison (4) est soudé sur la plus grande partie de sa surface à la deuxième branche du L (3) et l'élément de liaison (4) est réalisé en ayant une diminution de section en direction de la surface de coupe (2), l'élément de liaison (4) comportant un alésage ou une rainure (5) dans sa surface supérieure et la rainure (5) ou l'alésage s'étendant dans une direction générale perpendiculaire à la direction d'insertion de l'unité de coupe (1) dans le porte-outil (6).
  2. Unité de coupe selon la revendication 1 caractérisée en ce que l'élément de liaison (4) et la deuxième branche du L (3) comportent une liaison par soudage par friction.
  3. Unité de coupe selon la revendication 1 ou 2 caractérisée en ce que l'élément de liaison (4) est une pièce qui présente en coupe une forme polygonale.
  4. Unité de coupe selon la revendication 3 caractérisée en ce que l'élément de liaison (4) est constitué au moins en partie en tant que pièce présentant quatre pans ou six pans.
  5. Unité de coupe selon la revendication 1 ou la revendication 2 caractérisée en ce que l'élément de liaison (4) est susceptible d'être vissé sur le porte-outil (6).
  6. Unité de coupe selon l'une des revendications 1 à 5 caractérisée on ce qu'il est prévu une broche de sécurité conçue pour être introduite dans un perçage (7) ménagé dans le porte-outil (4) et s'étendant dans la rainure (5) ou l'alésage de l'élément de liaison (4).
  7. Unité de coupe selon l'une quelconque des revendications 1 à 6 caractérisée en ce que l'élément de liaison (4) est rapporté à une certaine distance de la surface de coupe (2) sur la deuxième branche (3).
  8. Unité de coupe selon l'une quelconque des revendications 1 à 7 caractérisée en ce que l'élément de liaison (3,4) est adapté convenablement dans un adaptateur (20) susceptible d'être vissé sur une broche (6).
EP88103837A 1987-04-14 1988-03-11 Unité de coupe Expired - Lifetime EP0286837B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873712707 DE3712707A1 (de) 1987-04-14 1987-04-14 Messereinsatz
DE3712707 1987-04-14

Publications (2)

Publication Number Publication Date
EP0286837A1 EP0286837A1 (fr) 1988-10-19
EP0286837B1 true EP0286837B1 (fr) 1992-07-08

Family

ID=6325639

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88103837A Expired - Lifetime EP0286837B1 (fr) 1987-04-14 1988-03-11 Unité de coupe

Country Status (3)

Country Link
US (1) US4852261A (fr)
EP (1) EP0286837B1 (fr)
DE (2) DE3712707A1 (fr)

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DE3814554A1 (de) * 1988-04-29 1989-11-09 Fein C & E Schneidmesser
DE8907586U1 (de) * 1989-06-21 1989-08-03 Mütter, Wilhelm, 5650 Solingen Messer zum Auftrennen von Klebewulsten
DE3929852A1 (de) * 1989-08-15 1991-02-21 Fein C & E Schaelmesser
EP0711636B1 (fr) * 1994-11-08 1998-04-15 Engelbert Gmeilbauer Outil motorisé vibrant portable
AUPN743896A0 (en) 1996-01-05 1996-02-01 Lock, Trevor Stanley Improvements in windscreen removal devices
RU2178733C2 (ru) * 1999-08-02 2002-01-27 БОГУСЛАВСКИЙ Борис Зельманович Режущий инструмент для разделения эластичного соединения стекла с корпусом автомобиля
DE20003499U1 (de) * 2000-02-25 2000-05-18 Fein C & E Schneidmesser
DE10058894A1 (de) * 2000-11-23 2002-06-06 C & E Fein Gmbh & Co Kg Werkzeug mit einem Halter zur Befestigung an einer Antriebswelle
US20050022647A1 (en) * 2003-07-28 2005-02-03 Lin Bin Chun Anti-tilt device for arm of band saw
FR2861625B1 (fr) * 2003-10-30 2006-01-27 Daniel Lacourt Appareil de decoupe de revetement de murs ou de sols
USD619152S1 (en) 2009-12-18 2010-07-06 Techtronic Power Tools Technology Limited Adapter
USD623034S1 (en) 2009-12-18 2010-09-07 Techtronic Power Tools Technology Limited Tool arbor
USD653523S1 (en) 2010-09-29 2012-02-07 Milwaukee Electric Tool Corporation Adapter for a tool
USD646542S1 (en) 2010-09-29 2011-10-11 Milwaukee Electric Tool Corporation Accessory interface for a tool
USD651062S1 (en) 2010-09-29 2011-12-27 Milwaukee Electric Tool Corporation Tool interface for an accessory
US9555554B2 (en) 2013-05-06 2017-01-31 Milwaukee Electric Tool Corporation Oscillating multi-tool system

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Also Published As

Publication number Publication date
DE3712707A1 (de) 1988-11-03
EP0286837A1 (fr) 1988-10-19
DE3872565D1 (de) 1992-08-13
US4852261A (en) 1989-08-01

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