EP3727770B1 - Wall saw with a locking device - Google Patents

Wall saw with a locking device Download PDF

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Publication number
EP3727770B1
EP3727770B1 EP18807378.7A EP18807378A EP3727770B1 EP 3727770 B1 EP3727770 B1 EP 3727770B1 EP 18807378 A EP18807378 A EP 18807378A EP 3727770 B1 EP3727770 B1 EP 3727770B1
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EP
European Patent Office
Prior art keywords
saw
saw blade
rotation
drive spindle
flange
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Active
Application number
EP18807378.7A
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German (de)
French (fr)
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EP3727770A1 (en
Inventor
Josef Schittl
Bruno Werder
Walter Nessler
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Hilti AG
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Hilti AG
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Publication of EP3727770A1 publication Critical patent/EP3727770A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B5/00—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
    • B27B5/29—Details; Component parts; Accessories
    • B27B5/38—Devices for braking the circular saw blade or the saw spindle; Devices for damping vibrations of the circular saw blade, e.g. silencing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/04—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs
    • B28D1/044—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs the saw blade being movable on slide ways
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/04—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs
    • B28D1/045—Sawing grooves in walls; sawing stones from rocks; sawing machines movable on the stones to be cut
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B5/00—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
    • B27B5/29—Details; Component parts; Accessories
    • B27B5/30—Details; Component parts; Accessories for mounting or securing saw blades or saw spindles
    • B27B5/32—Devices for securing circular saw blades to the saw spindle

Definitions

  • the present invention relates to a wall saw with a locking device according to the preamble of claim 1.
  • the saw blade is attached to the drive spindle using a saw blade flange.
  • the saw blade flange consists of two flange halves, with a first flange half being connected to the drive spindle and a second flange half being connected to the saw blade.
  • the first and second flange halves are connected to one another via a screw connection.
  • On the circumference of the first flange half radially arranged locking screws are provided, which are screwed into corresponding radial bores with internal threads in the second flange half.
  • the disadvantage is that the operator has to remove the saw blade to loosen the bolted connection between the flange halves.
  • the locking device preferably has a pull rod, which is guided inside the drive spindle, and a first connecting element and the saw blade flange has a second connecting element, the first and second connecting elements being able to be connected in a non-positive and/or positive manner.
  • the first and second connecting elements are particularly preferably connected in a non-positive and/or positive manner in the locked state of the saw blade flange.
  • the lever can be adjusted between a first and second end position when the saw blade flange is in the locked state, with the pawl blocking torque transmission in the direction of rotation of the saw blade in the first end position of the lever and releasing it in the second end position of the lever.
  • the lever can only be adjusted by the operator from the first end position to the second end position when the tool holder for the tool is sunk into the saw arm housing.
  • the pawl In the unlocked state of the saw blade flange, the pawl particularly preferably blocks rotation of the drive spindle in the direction of rotation of the saw blade and releases the rotation of the drive spindle in the opposite direction to the direction of rotation.
  • FIG. 1 shows a device system 10 with a tool device 11 which is designed as a wall saw, and a guide rail 12 .
  • the wall saw 11 comprises a processing and feed unit 13 arranged to be displaceable on the guide rail 12 and a remote control 14 .
  • the processing and feed unit 13 comprises a processing unit 15 and a motorized feed unit 16 .
  • the processing unit 15 is designed as a saw head and includes a saw blade 17 which is attached to a saw arm 18 and is driven by a drive motor about an axis of rotation 19 .
  • the saw blade 17 is surrounded by a saw blade guard 21 which is attached to the saw arm 18 by means of a blade guard holder 22 .
  • the saw arm 18 is designed to be pivotable about a pivot axis by a pivot motor.
  • the swivel angle of the saw arm 18 determines with a saw blade diameter of the saw blade 17 how deep the saw blade 17 dips into a workpiece to be machined.
  • the motorized feed unit 16 includes a guide carriage 23 and a feed motor.
  • the saw head 15 is mounted on the guide carriage 23 and is designed to be displaceable via the feed motor along the guide rail 12 in a feed direction 24 (double arrow).
  • FIGN. 2A , B show the saw head 15 of the wall saw 11 with the pivotable saw arm 18 in detail, with the saw blade 17 and the saw blade guard 21 being removed. while showing FIG. 2A the saw head 15 in a front view facing the saw arm and FIG. 2 B shows the saw head 15 in a rear view facing away from the saw arm.
  • FIG. 3 shows the saw head 15 of the wall saw 11 without the saw blade 17 and saw blade guard 21 in a side view.
  • the saw blade 17 can be connected to the saw arm 18 in a rotationally fixed manner by means of the saw blade flange 25 .
  • the saw blade 17 is driven about the axis of rotation 19 via a drive motor 31 , a transmission device and a drive spindle 33 .
  • the drive motor 31 is arranged in a motor housing 34 and non-rotatably connected to the transmission device, which is designed as a planetary gear in the exemplary embodiment.
  • the planetary gear is at least partially arranged in a saw arm housing 35 of the saw arm 18 .
  • the last stage of the planetary gear is connected to the drive spindle 33 in a torque-transmitting manner.
  • the saw head 15 is mounted on the guide carriage 23 and is moved along the guide rail 12 by a feed motor 36 .
  • the feed motor 36, the swivel motor 27 and the drive motor 31 can be designed as separate motors or can be integrated into one or more motors.
  • all of the motors 27 , 31 , 36 of the wall saw 11 are arranged in the motor housing 34 .
  • the saw blade flange 25 in the embodiment of FIG. 3 designed in several parts and comprises an inner flange 37 , an outer flange 38 and a fastening screw 39 .
  • the inner flange 37 is mounted non-rotatably on the drive spindle 33, then the saw blade 17 and the outer flange 38 are successively pushed onto the drive spindle 33 and finally the outer flange 38 is fastened via the fastening screw 39.
  • the fastening screw 39 is tightened until the saw blade 17 is clamped between the inner flange 37 and the outer flange 38 in a torque-proof manner.
  • a one-part saw blade flange for flush cuts which is also referred to as a flush cut flange, can be used.
  • FIGN. 4A , B show the drive spindle 33 and the saw blade flange 25 arranged on the drive spindle 33 in an unlocked state ( FIG. 4A ) and a locked state ( FIG. 4B ).
  • the saw blade flange 25 consists of the inner flange 37, which can be connected in a torque-proof manner to the drive spindle 33, and of the outer flange 38 and the fastening screw 39.
  • the inner flange 37 is opposite the Drive spindle 33 is designed to be adjustable and in the locked state the inner flange 37 is connected to the drive spindle 33 in a torque-proof manner.
  • the locking of the inner flange 37 takes place via a locking device 41 , which is designed in several parts in the exemplary embodiment.
  • the locking device includes a rod 42 which is designed as a pull rod and is guided inside the drive spindle 33 , a tool holder and a first connecting element 44 .
  • the tool holder is provided on an end of the pull rod 42 facing away from the inner flange 37 and is designed as an inner Torx holder in the exemplary embodiment.
  • the first connecting element 44 is provided on an end of the pull rod 42 facing the inner flange 37 and is designed as an external thread in the exemplary embodiment.
  • the external thread 44 is complementary to an internally threaded bore 45 which is provided in the inner flange 37 and forms a second connecting element.
  • the drive spindle 33 is hollow and forms a guide for the pull rod 42 on the inside.
  • the pull rod 42 is preloaded in the pulling direction by a spring 46 which is arranged in a hollow space in the drive spindle 33 surrounding the pull rod 42 .
  • the movement of the pull rod 42 takes place via a tool which can be connected to the pull rod 42 via the tool holder and which is designed as a Torx key in the exemplary embodiment.
  • the Torx key is inserted into the tool holder.
  • the pull rod 42 is initially displaced in the axial direction along the axis of rotation 19 against the spring tension of the spring 46 with the aid of the Torx key until the external thread 44 of the pull rod 42 engages in the internal thread 45 of the inner flange 37 .
  • the external thread 44 is screwed into the internal thread 46 by turning the Torx key around the axis of rotation 19 .
  • the external thread 44 of the pull rod 42 and the internal thread 45 of the inner flange 37 form a non-positive and positive connection between the inner flange 37 and the pull rod 42.
  • the threaded connection between the inner flange 37 and the pull rod 42 is fully formed when the tool holder is opposite the saw arm housing 35 is flush or is set back relative to the saw arm housing 35 towards the inner flange 37 .
  • the wall saw 11 has a safety device that ensures that the external and internal threads 44, 45 are positively connected over the minimum height.
  • a lever 48 is provided on the side of the saw arm housing 35 facing away from the flange, which is part of the safety device and which can be adjusted about an adjustment axis 49 between a first end position and a second end position. In the FIG. 4A The position of the lever 48 shown is referred to as the first end position and the FIG. 4B shown position of the lever 48 is referred to as the second end position.
  • FIGN. 5A , B show the safety device in a first position, which corresponds to the first end position of the lever 48
  • FIGN. 6A , B show the safety device in a second position, which corresponds to the second end position of the lever 48.
  • the safety device comprises a pawl 51 , an axle element which rigidly connects the lever 48 and the pawl 51 to one another, and a push button.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)

Description

Technisches Gebiettechnical field

Die vorliegende Erfindung betrifft eine Wandsäge mit einer Verriegelungseinrichtung gemäß dem Oberbegriff des Anspruchs 1.The present invention relates to a wall saw with a locking device according to the preamble of claim 1.

Stand der TechnikState of the art

Bei der Anwendung von Wandsägen zum Trennen eines Werkstückes zwischen einem ersten und zweiten Endpunkt ist es üblich, den Trennschnitt in mehreren Teilschnitten mit unterschiedlich großen Sägeblättern durchzuführen. Wenn mehrere Sägeblätter eingesetzt werden, beginnt die Bearbeitung in der Regel mit dem kleinsten Sägeblattdurchmesser und das Sägeblatt muss zwischen den Teilschnitten gewechselt werden.When wall saws are used to cut a workpiece between a first and second end point, it is customary to make the cut in several partial cuts with saw blades of different sizes. If several saw blades are used, processing usually starts with the smallest saw blade diameter and the saw blade has to be changed between the partial cuts.

EP 0 785 054 B1 offenbart ein Gerätesystem mit einer Wandsäge und einer Führungsschiene. Die Wandsäge weist einen Sägekopf und eine motorische Vorschubeinheit auf. Der Sägekopf umfasst ein Sägeblatt, das an einem Sägearm befestigt ist und von einem Antriebsmotor um eine Drehachse angetrieben wird. Der Sägearm ist schwenkbar ausgebildet und wird von einem Schwenkmotor um eine Schwenkachse verstellt. Die motorische Vorschubeinheit umfasst einen Führungsschlitten und einen Vorschubmotor, wobei der Sägekopf auf dem Führungsschlitten angeordnet und über den Vorschubmotor entlang der Führungsschiene verfahren wird. Der Antrieb des Sägeblattes um die Drehachse erfolgt über den Antriebsmotor, eine Antriebsspindel und eine Übertragungseinrichtung, die die Antriebsspindel drehmomentübertragend mit dem Antriebsmotor verbindet. Das Sägeblatt wird mit Hilfe eines Sägeblattflansches auf der Antriebsspindel befestigt. Der Sägeblattflansch besteht aus zwei Flanschhälften, wobei eine erste Flanschhälfte mit der Antriebsspindel und eine zweite Flanschhälfte mit dem Sägeblatt verbunden werden. Die erste und zweite Flanschhälfte werden über eine Schraubverbindung miteinander verbunden. Am Umfang der ersten Flanschhälfte sind radial angeordnete Sicherungsschrauben vorgesehen, die in korrespondierende radiale Bohrungen mit Innengewinde in der zweiten Flanschhälfte eingeschraubt werden. Nachteilig ist, dass der Bediener das Sägeblatt entfernen muss, um die Schraubverbindung zwischen den Flanschhälften zu lösen. EP 0 785 054 B1 discloses a device system with a wall saw and a guide rail. The wall saw has a saw head and a motorized feed unit. The saw head comprises a saw blade which is attached to a saw arm and is driven about an axis of rotation by a drive motor. The saw arm is pivotable and is adjusted about a pivot axis by a pivot motor. The motorized feed unit comprises a guide carriage and a feed motor, the saw head being arranged on the guide carriage and being moved along the guide rail by the feed motor. The saw blade is driven about the axis of rotation via the drive motor, a drive spindle and a transmission device which connects the drive spindle to the drive motor in a torque-transmitting manner. The saw blade is attached to the drive spindle using a saw blade flange. The saw blade flange consists of two flange halves, with a first flange half being connected to the drive spindle and a second flange half being connected to the saw blade. The first and second flange halves are connected to one another via a screw connection. On the circumference of the first flange half, radially arranged locking screws are provided, which are screwed into corresponding radial bores with internal threads in the second flange half. The disadvantage is that the operator has to remove the saw blade to loosen the bolted connection between the flange halves.

Darstellung der ErfindungPresentation of the invention

Die Aufgabe der vorliegenden Erfindung besteht darin, bei einer Wandsäge die Verriegelung des Sägeblattflansches auf der Antriebsspindel für den Bediener zu vereinfachen. Außerdem soll das Wechseln eines Sägeblattes zwischen Teilschnitten eines Trennschnittes für den Bediener erleichtert werden.The object of the present invention consists in simplifying the locking of the saw blade flange on the drive spindle for the operator in the case of a wall saw. In addition, changing a saw blade between partial cuts of a separating cut should be made easier for the operator.

Diese Aufgabe wird bei der eingangs genannten Vorrichtung erfindungsgemäß durch die Merkmale des unabhängigen Anspruchs gelöst. Vorteilhafte Weiterbildungen sind in den abhängigen Ansprüchen angegeben.In the case of the device mentioned at the outset, this object is achieved according to the invention by the features of the independent claim. Advantageous developments are specified in the dependent claims.

Erfindungsgemäß ist vorgesehen, dass die Antriebsspindel im entriegelten Zustand des Sägeblattflansches in der Drehrichtung des Sägeblattes blockiert ist und in einer zur Drehrichtung entgegen gerichteten Gegenrichtung um die Drehachse drehbar ist. Im entriegelten Zustand des Sägeblattflansches ist der Sägeblattflansch nicht drehfest mit der Antriebsspindel verbunden und ist gegenüber der Antriebsspindel verstellbar ausgebildet. Die erfindungsgemäße Ausbildung der Antriebsspindel hat den Vorteil, dass ein unbeabsichtigtes Anlaufen des Sägeblattes im entriegelten Zustand des Sägeblattflansches unterbunden ist. Dadurch, dass die Antriebsspindel in der zur Drehrichtung entgegen gerichteten Gegenrichtung um die Drehachse drehbar ist, kann der Bediener das Sägeblatt oder die Antriebsspindel in eine Winkelposition bewegen, die ihm den Wechsel des Sägeblattes erleichtert.According to the invention it is provided that the drive spindle is blocked in the unlocked state of the saw blade flange in the direction of rotation of the saw blade and can be rotated about the axis of rotation in an opposite direction to the direction of rotation. In the unlocked state of the saw blade flange, the saw blade flange is not connected in a rotationally fixed manner to the drive spindle and is designed to be adjustable in relation to the drive spindle. The design of the drive spindle according to the invention has the advantage that the saw blade is prevented from starting up unintentionally when the saw blade flange is in the unlocked state. Because the drive spindle can be rotated about the axis of rotation in the opposite direction to the direction of rotation, the operator can move the saw blade or the drive spindle into an angular position that makes it easier for him to change the saw blade.

Bevorzugt weist die Wandsäge eine motorische Vorschubeinheit mit einem Führungsschlitten und einem Vorschubmotor auf, wobei der Sägekopf auf dem Führungsschlitten angeordnet und vom Vorschubmotor entlang einer Führungsschiene in einer Vorschubrichtung verfahrbar ist. Die erfindungsgemäße Ausbildung der Wandsäge ist vorteilhaft bei großen und schweren Werkzeuggeräten, die nicht handgeführt ausgebildet sind, sondern eine motorische Vorschubeinheit aufweisen, die das Werkzeuggerät entlang einer Führungsschiene verfahren.The wall saw preferably has a motorized feed unit with a guide carriage and a feed motor, the saw head being arranged on the guide carriage and being movable by the feed motor along a guide rail in a feed direction. The construction of the wall saw according to the invention is advantageous for large and heavy power tools that are not designed to be hand-held but have a motorized feed unit that moves the power tool along a guide rail.

Bevorzugt weisen die Verriegelungseinrichtung eine Zugstange, die im Inneren der Antriebsspindel geführt ist, und ein erstes Verbindungselement und der Sägeblattflansch ein zweites Verbindungselement auf, wobei das erste und zweite Verbindungselement kraft- und/oder formschlüssig verbindbar sind. Besonders bevorzugt sind das erste und zweite Verbindungselement im verriegelten Zustand des Sägeblattflansches kraft- und/oder formschlüssig verbunden.The locking device preferably has a pull rod, which is guided inside the drive spindle, and a first connecting element and the saw blade flange has a second connecting element, the first and second connecting elements being able to be connected in a non-positive and/or positive manner. The first and second connecting elements are particularly preferably connected in a non-positive and/or positive manner in the locked state of the saw blade flange.

In einer bevorzugten Ausführung weist die Wandsäge eine Sichereinheitseinrichtung auf. Bevorzugt weist die Sichereinheitseinrichtung einen Hebel, eine Klinke und ein Achselement, das den Hebel und die Klinke miteinander verbindet, auf.In a preferred embodiment, the wall saw has a safety unit device. The safety unit device preferably has a lever, a pawl and an axle element which connects the lever and the pawl to one another.

Besonders bevorzugt ist der Hebel im verriegelten Zustand des Sägeblattflansches zwischen einer ersten und zweiten Endposition verstellbar, wobei die Klinke eine Drehmomentübertragung in Drehrichtung des Sägeblattes in der ersten Endposition des Hebels blockiert und in der zweiten Endposition des Hebels freigibt. Der Hebel lässt sich vom Bediener nur dann aus der ersten Endposition in die zweite Endposition verstellen, wenn die Werkzeugaufnahme für das Werkzeug im Sägearmgehäuse versenkt ist.Particularly preferably, the lever can be adjusted between a first and second end position when the saw blade flange is in the locked state, with the pawl blocking torque transmission in the direction of rotation of the saw blade in the first end position of the lever and releasing it in the second end position of the lever. The lever can only be adjusted by the operator from the first end position to the second end position when the tool holder for the tool is sunk into the saw arm housing.

Besonders bevorzugt blockiert die Klinke im entriegelten Zustand des Sägeblattflansches eine Drehung der Antriebsspindel in Drehrichtung des Sägeblattes und gibt die Drehung der Antriebsspindel in der zur Drehrichtung entgegen gerichteten Gegenrichtung frei.In the unlocked state of the saw blade flange, the pawl particularly preferably blocks rotation of the drive spindle in the direction of rotation of the saw blade and releases the rotation of the drive spindle in the opposite direction to the direction of rotation.

Ausführungsbeispieleexemplary embodiments

Ausführungsbeispiele der Erfindung werden nachfolgend anhand der Zeichnung beschrieben. Diese soll die Ausführungsbeispiele nicht notwendigerweise maßstäblich darstellen, vielmehr ist die Zeichnung, wo zur Erläuterung dienlich, in schematischer und/oder leicht verzerrter Form ausgeführt. Dabei ist zu berücksichtigen, dass vielfältige Modifikationen und Änderungen betreffend die Form und das Detail einer Ausführungsform vorgenommen werden können, ohne von dem Schutzumfang der anhängenden Ansprüche abzuweichen.Exemplary embodiments of the invention are described below with reference to the drawing. This is not necessarily intended to represent the exemplary embodiments to scale; instead, the drawing is in schematic and/or slightly distorted form where it is useful for explanation. It is to be understood that various modifications and changes may be made in form and detail of an embodiment without departing from the scope of the appended claims.

Die allgemeine Idee der Erfindung ist nicht beschränkt auf die exakte Form oder das Detail der im Folgenden gezeigten und beschriebenen bevorzugten Ausführungsform oder beschränkt auf einen Gegenstand, der eingeschränkt wäre im Vergleich zu dem in den Ansprüchen beanspruchten Gegenstand. Bei gegebenen Bemessungsbereichen sollen auch innerhalb der genannten Grenzen liegende Werte als Grenzwerte offenbart und beliebig einsetzbar und beanspruchbar sein. Der Einfachheit halber sind nachfolgend für identische oder ähnliche Teile oder Teile mit identischer oder ähnlicher Funktion gleiche Bezugszeichen verwendet.The general idea of the invention is not limited to the exact form or detail of the preferred embodiment shown and described below, or limited to a subject matter which would be limited compared to the subject matter claimed in the claims. In the case of given design ranges, values lying within the specified limits should also be disclosed as limit values and should be able to be used and claimed as desired. For the sake of simplicity, the same reference numbers are used below for identical or similar parts or parts with an identical or similar function.

Es zeigen:

FIG. 1
ein Gerätesystem mit einer Führungsschiene und einer Wandsäge, die eine entlang der Führungsschiene verschiebbar angeordnete Bearbeitungs- und Vorschubeinheit mit einem Sägekopf und einer motorischen Vorschubeinheit umfasst;
FIGN. 2A, B
den Sägekopf der FIG. 1 in einer Vorderansicht (FIG. 2A) und einer Rückansicht (FIG. 2B);
FIG. 3
den Sägekopf der FIG. 1 ohne Sägeblatt, das mittels eines Sägeblattflansches an einer Antriebsspindel anordbar ist, in einer Seitenansicht;
FIGN. 4A, B
die Antriebsspindel und den Sägeblattflansch der FIG. 3, die mittels einer Verriegelungseinrichtung miteinander verbindbar sind, in einem entriegelten Zustand (FIG. 4A) und einem verriegelten Zustand (FIG. 4B);
FIGN. 5A, B
eine Sicherheitseinrichtung in einer ersten Endposition, die dem in FIG. 4A dargestellten, entriegelten Zustand des Sägeblattflansches entspricht; und
FIGN. 6A, B
die Sicherheitseinrichtung in einer zweiten Endposition, die dem in FIG. 4B dargestellten, verriegelten Zustand des Sägeblattflansches entspricht.
Show it:
FIG. 1
a device system with a guide rail and a wall saw, which comprises a processing and feed unit with a saw head and a motorized feed unit, which is arranged to be displaceable along the guide rail;
FIGN. 2A, B
the saw head FIG. 1 in a front view ( FIG. 2A ) and a rear view ( FIG. 2 B );
FIG. 3
the saw head FIG. 1 without a saw blade, which can be arranged on a drive spindle by means of a saw blade flange, in a side view;
FIGN. 4A, B
the drive spindle and the saw blade flange FIG. 3 , which can be connected to one another by means of a locking device, in an unlocked state ( FIG. 4A ) and a locked state ( FIG. 4B );
FIGN. 5A, B
a safety device in a first end position, which corresponds to the in FIG. 4A shown, corresponds to the unlocked state of the saw blade flange; and
FIGN. 6A, B
the safety device in a second end position, which corresponds to the in FIG. 4B corresponds to the locked state of the saw blade flange shown.

FIG. 1 zeigt ein Gerätesystem 10 mit einem Werkzeuggerät 11, das als Wandsäge ausgebildet ist, und einer Führungsschiene 12. Die Wandsäge 11 umfasst eine an der Führungsschiene 12 verschiebbar angeordnete Bearbeitungs- und Vorschubeinheit 13 und eine Fernbedienung 14. Die Bearbeitungs- und Vorschubeinheit 13 umfasst eine Bearbeitungseinheit 15 und eine motorische Vorschubeinheit 16. Die Bearbeitungseinheit 15 ist als Sägekopf ausgebildet und umfasst ein Sägeblatt 17, das an einem Sägearm 18 befestigt ist und von einem Antriebsmotor um eine Drehachse 19 angetrieben wird. FIG. 1 shows a device system 10 with a tool device 11 which is designed as a wall saw, and a guide rail 12 . The wall saw 11 comprises a processing and feed unit 13 arranged to be displaceable on the guide rail 12 and a remote control 14 . The processing and feed unit 13 comprises a processing unit 15 and a motorized feed unit 16 . The processing unit 15 is designed as a saw head and includes a saw blade 17 which is attached to a saw arm 18 and is driven by a drive motor about an axis of rotation 19 .

Zum Schutz des Bedieners ist das Sägeblatt 17 von einem Sägeblattschutz 21 umgeben, der mittels eines Blattschutzhalters 22 am Sägearm 18 befestigt wird. Der Sägearm 18 ist von einem Schwenkmotor um eine Schwenkachse schwenkbar ausgebildet. Der Schwenkwinkel des Sägearms 18 bestimmt mit einem Sägeblattdurchmesser des Sägeblattes 17, wie tief das Sägeblatt 17 in ein zu bearbeitendes Werkstück eintaucht. Die motorische Vorschubeinheit 16 umfasst einen Führungsschlitten 23 und einen Vorschubmotor. Der Sägekopf 15 ist auf dem Führungsschlitten 23 befestigt und über den Vorschubmotor entlang der Führungsschiene 12 in einer Vorschubrichtung 24 (Doppelpfeil) verschiebbar ausgebildet.To protect the operator, the saw blade 17 is surrounded by a saw blade guard 21 which is attached to the saw arm 18 by means of a blade guard holder 22 . The saw arm 18 is designed to be pivotable about a pivot axis by a pivot motor. The swivel angle of the saw arm 18 determines with a saw blade diameter of the saw blade 17 how deep the saw blade 17 dips into a workpiece to be machined. The motorized feed unit 16 includes a guide carriage 23 and a feed motor. The saw head 15 is mounted on the guide carriage 23 and is designed to be displaceable via the feed motor along the guide rail 12 in a feed direction 24 (double arrow).

FIGN. 2A , B zeigen den Sägekopf 15 der Wandsäge 11 mit dem schwenkbaren Sägearm 18 im Detail, wobei das Sägeblatt 17 und der Sägeblattschutz 21 demontiert sind. Dabei zeigt FIG. 2A den Sägekopf 15 in einer dem Sägearm zugewandten Vorderansicht und FIG. 2B zeigt den Sägekopf 15 in einer dem Sägearm abgewandten Rückansicht. FIGN. 2A , B show the saw head 15 of the wall saw 11 with the pivotable saw arm 18 in detail, with the saw blade 17 and the saw blade guard 21 being removed. while showing FIG. 2A the saw head 15 in a front view facing the saw arm and FIG. 2 B shows the saw head 15 in a rear view facing away from the saw arm.

Das Sägeblatt 17 wird mittels eines Sägeblattflansches 25 am Sägearm 18 montiert und rotiert im Betrieb der Wandsäge 11 in einer Drehrichtung 26 um die Drehachse 19. Der Sägearm 18 ist mittels eines Schwenkmotors 27 um eine Schwenkachse 28 schwenkbar ausgebildet; alternativ kann der Sägearm 18 mit Hilfe eines Linearantriebes oder einer sonstigen Antriebseinrichtung verstellbar ausgebildet sein.The saw blade 17 is mounted on the saw arm 18 by means of a saw blade flange 25 and rotates in the operation of the wall saw 11 in a direction of rotation 26 about the axis of rotation 19. The saw arm 18 is designed to be pivotable about a pivot axis 28 by means of a pivot motor 27 ; alternatively, the saw arm 18 can be designed to be adjustable with the aid of a linear drive or some other drive device.

FIG. 3 zeigt den Sägekopf 15 der Wandsäge 11 ohne Sägeblatt 17 und Sägeblattschutz 21 in einer Seitenansicht. Das Sägeblatt 17 ist mittels des Sägeblattflansches 25 drehfest mit dem Sägearm 18 verbindbar. Der Antrieb des Sägeblattes 17 um die Drehachse 19 erfolgt über einen Antriebsmotor 31, eine Übertragungseinrichtung und eine Antriebsspindel 33. Der Antriebsmotor 31 ist in einem Motorgehäuse 34 angeordnet und mit der Übertragungseinrichtung, die im Ausführungsbeispiel als Planetengetriebe ausgebildet ist, drehfest verbunden. Das Planetengetriebe ist zumindest teilweise in einem Sägearmgehäuse 35 des Sägearmes 18 angeordnet. Die letzte Stufe des Planetengetriebes ist im Ausführungsbeispiel drehmomentübertragend mit der Antriebsspindel 33 verbunden. FIG. 3 shows the saw head 15 of the wall saw 11 without the saw blade 17 and saw blade guard 21 in a side view. The saw blade 17 can be connected to the saw arm 18 in a rotationally fixed manner by means of the saw blade flange 25 . The saw blade 17 is driven about the axis of rotation 19 via a drive motor 31 , a transmission device and a drive spindle 33 . The drive motor 31 is arranged in a motor housing 34 and non-rotatably connected to the transmission device, which is designed as a planetary gear in the exemplary embodiment. The planetary gear is at least partially arranged in a saw arm housing 35 of the saw arm 18 . In the exemplary embodiment, the last stage of the planetary gear is connected to the drive spindle 33 in a torque-transmitting manner.

Der Sägekopf 15 ist auf dem Führungsschlitten 23 befestigt und wird von einem Vorschubmotor 36 entlang der Führungsschiene 12 verfahren. Der Vorschubmotor 36, der Schwenkmotor 27 und der Antriebsmotor 31 können als separate Motoren ausgebildet sein oder in einen oder mehrere Motoren integriert sein. Im Ausführungsbeispiel sind sämtliche Motoren 27, 31, 36 der Wandsäge 11 im Motorgehäuse 34 angeordnet.The saw head 15 is mounted on the guide carriage 23 and is moved along the guide rail 12 by a feed motor 36 . The feed motor 36, the swivel motor 27 and the drive motor 31 can be designed as separate motors or can be integrated into one or more motors. In the exemplary embodiment, all of the motors 27 , 31 , 36 of the wall saw 11 are arranged in the motor housing 34 .

Der Sägeblattflansch 25 im Ausführungsbeispiel der FIG. 3 mehrteilig ausgebildet und umfasst einen Innenflansch 37, einen Außenflansch 38 und eine Befestigungsschraube 39. Der Innenflansch 37 wird drehfest auf der Antriebsspindel 33 montiert, anschließend werden nacheinander das Sägeblatt 17 und der Außenflansch 38 auf die Antriebsspindel 33 aufgesteckt und zuletzt wird der Außenflansch 38 über die Befestigungsschraube 39 befestigt. Die Befestigungsschraube 39 wird soweit angezogen, dass das Sägeblatt 17 drehfest zwischen dem Innenflansch 37 und dem Außenflansch 38 eingeklemmt ist. Alternativ zum gezeigten mehrteiligen Sägeblattflansch 25 aus Innen- und Außenflansch 37, 38 kann ein einteiliger Sägeblattflansch für Bündigschnitte, der auch als Bündigschnittflansch bezeichnet wird, eingesetzt werden.The saw blade flange 25 in the embodiment of FIG. 3 designed in several parts and comprises an inner flange 37 , an outer flange 38 and a fastening screw 39 . The inner flange 37 is mounted non-rotatably on the drive spindle 33, then the saw blade 17 and the outer flange 38 are successively pushed onto the drive spindle 33 and finally the outer flange 38 is fastened via the fastening screw 39. The fastening screw 39 is tightened until the saw blade 17 is clamped between the inner flange 37 and the outer flange 38 in a torque-proof manner. As an alternative to the shown multi-part saw blade flange 25 made up of inner and outer flanges 37, 38, a one-part saw blade flange for flush cuts, which is also referred to as a flush cut flange, can be used.

FIGN. 4A , B zeigen die Antriebsspindel 33 und den auf der Antriebsspindel 33 angeordneten Sägeblattflansch 25 in einem entriegelten Zustand (FIG. 4A) und einem verriegelten Zustand (FIG. 4B). Der Sägeblattflansch 25 besteht aus dem Innenflansch 37, der mit der Antriebsspindel 33 drehfest verbindbar ist, sowie aus dem Außenflansch 38 und der Befestigungsschraube 39. Im entriegelten Zustand ist der Innenflansch 37 gegenüber der Antriebsspindel 33 verstellbar ausgebildet und im verriegelten Zustand ist der Innenflansch 37 drehfest mit der Antriebsspindel 33 verbunden. FIGN. 4A , B show the drive spindle 33 and the saw blade flange 25 arranged on the drive spindle 33 in an unlocked state ( FIG. 4A ) and a locked state ( FIG. 4B ). The saw blade flange 25 consists of the inner flange 37, which can be connected in a torque-proof manner to the drive spindle 33, and of the outer flange 38 and the fastening screw 39. In the unlocked state, the inner flange 37 is opposite the Drive spindle 33 is designed to be adjustable and in the locked state the inner flange 37 is connected to the drive spindle 33 in a torque-proof manner.

Das Verriegeln des Innenflansches 37 erfolgt über eine Verriegelungseinrichtung 41, die im Ausführungsbeispiel mehrteilig ausgebildet ist. Die Verriegelungseinrichtung umfasst eine Stange 42, die als Zugstange ausgebildet und im Inneren der Antriebsspindel 33 geführt ist, eine Werkzeugaufnahme und ein erstes Verbindungselement 44. Die Werkzeugaufnahme ist an einem dem Innenflansch 37 abgewandten Ende der Zugstange 42 vorgesehen und im Ausführungsbeispiel als Innen-Torx-Aufnahme ausgebildet. Das erste Verbindungselement 44 ist an einem dem Innenflansch 37 zugewandten Ende der Zugstange 42 vorgesehen und im Ausführungsbeispiel als Außengewinde ausgebildet.The locking of the inner flange 37 takes place via a locking device 41 , which is designed in several parts in the exemplary embodiment. The locking device includes a rod 42 which is designed as a pull rod and is guided inside the drive spindle 33 , a tool holder and a first connecting element 44 . The tool holder is provided on an end of the pull rod 42 facing away from the inner flange 37 and is designed as an inner Torx holder in the exemplary embodiment. The first connecting element 44 is provided on an end of the pull rod 42 facing the inner flange 37 and is designed as an external thread in the exemplary embodiment.

Das Außengewinde 44 ist komplementär zu einer Bohrung mit Innengewinde 45 ausgebildet, die im Innenflansch 37 vorgesehen ist und ein zweites Verbindungselement bildet. Die Antriebsspindel 33 ist hohl ausgeführt und bildet im Inneren eine Führung für die Zugstange 42. Die Zugstange 42 ist durch eine Feder 46, die in einem die Zugstange 42 umgebenden Hohlraum der Antriebsspindel 33 angeordnet ist, in Zugrichtung vorbelastet. Die Bewegung der Zugstange 42 erfolgt über ein Werkzeug, das über die Werkzeugaufnahme mit der Zugstange 42 verbindbar ist und das im Ausführungsbeispiel als Torx-Schlüssel ausgebildet ist.The external thread 44 is complementary to an internally threaded bore 45 which is provided in the inner flange 37 and forms a second connecting element. The drive spindle 33 is hollow and forms a guide for the pull rod 42 on the inside. The pull rod 42 is preloaded in the pulling direction by a spring 46 which is arranged in a hollow space in the drive spindle 33 surrounding the pull rod 42 . The movement of the pull rod 42 takes place via a tool which can be connected to the pull rod 42 via the tool holder and which is designed as a Torx key in the exemplary embodiment.

Um den Innenflansch 37 aus dem entriegelten Zustand (FIG. 4A) in den verriegelten Zustand (FIG. 4B) zu überführen, wird der Torx-Schlüssel in die Werkzeugaufnahme gesteckt. Die Zugstange 42 wird mit Hilfe des Torx-Schlüssels zunächst in axialer Richtung entlang der Drehachse 19 gegen die Federspannung der Feder 46 verschoben, bis das Außengewinde 44 der Zugstange 42 in das Innengewinde 45 des Innenflansches 37 eingreift. Durch Drehung des Torx-Schlüssels um die Drehachse 19 wird das Außengewinde 44 in das Innengewinde 46 eingeschraubt. Das Außengewinde 44 der Zugstange 42 und das Innengewinde 45 des Innenflansches 37 bilden eine kraft- und formschlüssige Verbindung zwischen dem Innenflansch 37 und der Zugstange 42. Die Gewindeverbindung zwischen dem Innenflansch 37 und der Zugstange 42 ist vollständig ausgebildet, wenn die Werkzeugaufnahme gegenüber dem Sägearmgehäuse 35 bündig ausgebildet ist oder gegenüber dem Sägearmgehäuse 35 zum Innenflansch 37 hin zurückversetzt ist.To move the inner flange 37 from the unlocked state ( FIG. 4A ) to the locked state ( FIG. 4B ) to convert, the Torx key is inserted into the tool holder. The pull rod 42 is initially displaced in the axial direction along the axis of rotation 19 against the spring tension of the spring 46 with the aid of the Torx key until the external thread 44 of the pull rod 42 engages in the internal thread 45 of the inner flange 37 . The external thread 44 is screwed into the internal thread 46 by turning the Torx key around the axis of rotation 19 . The external thread 44 of the pull rod 42 and the internal thread 45 of the inner flange 37 form a non-positive and positive connection between the inner flange 37 and the pull rod 42. The threaded connection between the inner flange 37 and the pull rod 42 is fully formed when the tool holder is opposite the saw arm housing 35 is flush or is set back relative to the saw arm housing 35 towards the inner flange 37 .

Um sicherzustellen, dass der Innenflansch 37 im Betrieb des Sägeblattes 17 sicher mit der Antriebsspindel 33 verbunden ist, muss das Außengewinde 44 der Zugstange 42 über eine Mindesthöhe in das Innengewinde 45 des Innenflansches 37 eingeschraubt werden. Die Wandsäge 11 weist eine Sicherheitseinrichtung auf, die sicherstellt, dass das Außen- und Innengewinde 44, 45 über die Mindesthöhe formschlüssig verbunden sind. An der flanschabgewandten Seite des Sägearmgehäuses 35 ist ein Hebel 48 vorgesehen, der Bestandteil der Sicherheitseinrichtung ist und der um eine Verstellachse 49 zwischen einer ersten Endposition und einer zweiten Endposition verstellbar ist. Die in FIG. 4A dargestellte Position des Hebels 48 wird als erste Endposition bezeichnet und die in FIG. 4B dargestellte Position des Hebels 48 wird als zweite Endposition bezeichnet.In order to ensure that the inner flange 37 is securely connected to the drive spindle 33 when the saw blade 17 is in operation, the outer thread 44 of the pull rod 42 must be screwed into the inner thread 45 of the inner flange 37 over a minimum height. The wall saw 11 has a safety device that ensures that the external and internal threads 44, 45 are positively connected over the minimum height. At the A lever 48 is provided on the side of the saw arm housing 35 facing away from the flange, which is part of the safety device and which can be adjusted about an adjustment axis 49 between a first end position and a second end position. In the FIG. 4A The position of the lever 48 shown is referred to as the first end position and the FIG. 4B shown position of the lever 48 is referred to as the second end position.

FIGN. 5A , B zeigen die Sicherheitseinrichtung in einer ersten Position, die der ersten Endposition des Hebels 48 entspricht, und FIGN. 6A , B zeigen die Sicherheitseinrichtung in einer zweiten Position, die der zweiten Endposition des Hebels 48 entspricht. Die Sicherheitseinrichtung umfasst neben dem Hebel 48 eine Klinke 51, ein Achselement, das den Hebel 48 und die Klinke 51 starr miteinander verbindet, und einen Drückknopf. FIGN. 5A , B show the safety device in a first position, which corresponds to the first end position of the lever 48, and FIGN. 6A , B show the safety device in a second position, which corresponds to the second end position of the lever 48. In addition to the lever 48, the safety device comprises a pawl 51 , an axle element which rigidly connects the lever 48 and the pawl 51 to one another, and a push button.

FIG. 5A zeigt den Hebel 48 in der ersten Endposition, die dem in FIG. 4A dargestellten entriegelten Zustand des Innenflansches 37 entspricht, und FIG. 6A zeigt den Hebel 48 in der zweiten Endposition, die dem in FIG. 4B dargestellten verriegelten Zustand des Innenflansches 37 entspricht. Der Hebel 48 lässt sich vom Bediener nur dann aus der ersten Endposition in die zweite Endposition verstellen, wenn die Werkzeugaufnahme für den Torx-Schlüssel im Sägearmgehäuse 35 versenkt ist. FIG. 5A shows the lever 48 in the first end position, which corresponds to that in FIG. 4A illustrated unlocked state of the inner flange 37 corresponds, and FIG. 6A shows the lever 48 in the second end position, which corresponds to that in FIG. 4B illustrated locked state of the inner flange 37 corresponds. The operator can only move the lever 48 from the first end position to the second end position when the tool holder for the Torx key is sunk into the saw arm housing 35 .

Claims (8)

  1. Wall saw (11), comprising:
    ▪ a drive spindle (33) which is mounted rotatably about an axis of rotation (19),
    ▪ a drive motor (31) and a transmission device which connects the drive motor (31) to the drive spindle (33), wherein the transmission device is at least partially arranged in a saw arm housing (35),
    ▪ a saw blade (17) which is fastened to a saw arm (18) and is rotatable by the drive spindle (33) in a direction of rotation (26) about the axis of rotation (19),
    ▪ a saw blade flange (25), wherein the saw blade (17) can be arranged by means of the saw blade flange (25) on the drive spindle (33) for rotation therewith, and
    ▪ a locking device (41), wherein the saw blade flange (25) is adjustable by means of the locking device (41) between a locked state and an unlocked state, in the locked state the saw blade flange (25) is connected to the drive spindle (33) for rotation therewith, and, in the unlocked state, the saw blade flange (25) is adjustable in relation to the drive spindle (33),
    characterized in that, in the unlocked state of the saw blade flange (25), the drive spindle (33) is blocked in the direction of rotation (26) of the saw blade (17) and is rotatable about the axis of rotation (19) in a counter direction directed counter to the direction of rotation (26).
  2. Wall saw according to Claim 1, characterized in that the wall saw (11) has a motorized feed unit (13) with a guide carriage (23) and a feed motor (36), wherein a saw head (15) is arranged on the guide carriage (23) and is movable by the feed motor (36) along a guide rail (12) in a feed direction (24).
  3. Wall saw according to Claim 1, characterized in that the locking device (41) has a tie rod (42), which is guided in the interior of the drive spindle (33), and a first connecting element (44), and the saw blade flange (25) has a second connecting element (45), wherein the first and second connecting elements (44, 45) are connectable in a force-fitting and/or form-fitting manner.
  4. Wall saw according to Claim 3, characterized in that, in the locked state, the first and second connecting elements (44, 45) are connected in a force-fitting and/or form-fitting manner.
  5. Wall saw according to Claim 1, characterized in that the wall saw (11) has a safety device.
  6. Wall saw according to Claim 5, characterized in that the safety device has a lever (48), a latch (51) and an axle element which connects the lever (48) and the latch (51) to each other.
  7. Wall saw according to Claim 6, characterized in that, in the locked state of the saw blade flange (25), the lever (48) is adjustable between a first and second end position, wherein the latch (51) blocks a transmission of torque in the direction of rotation (26) of the saw blade (17) in the first end position of the lever (48) and releases same in the second end position of the lever (48).
  8. Wall saw according to Claim 7, characterized in that, in the unlocked state of the saw blade flange (25), the latch (51) blocks a rotation of the drive spindle (33) in the direction of rotation (26) of the saw blade (17) and releases same in the counter direction directed counter to the direction of rotation (26).
EP18807378.7A 2017-12-22 2018-11-29 Wall saw with a locking device Active EP3727770B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP17209957.4A EP3501766A1 (en) 2017-12-22 2017-12-22 Wall saw with a locking device
PCT/EP2018/083004 WO2019120925A1 (en) 2017-12-22 2018-11-29 Wall saw having a locking device

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EP3727770A1 EP3727770A1 (en) 2020-10-28
EP3727770B1 true EP3727770B1 (en) 2022-03-23

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EP17209957.4A Withdrawn EP3501766A1 (en) 2017-12-22 2017-12-22 Wall saw with a locking device
EP18807378.7A Active EP3727770B1 (en) 2017-12-22 2018-11-29 Wall saw with a locking device

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EP17209957.4A Withdrawn EP3501766A1 (en) 2017-12-22 2017-12-22 Wall saw with a locking device

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US (1) US11597117B2 (en)
EP (2) EP3501766A1 (en)
WO (1) WO2019120925A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3970932A1 (en) * 2020-09-22 2022-03-23 Hilti Aktiengesellschaft System, method and flange device for fixing a saw blade to a drive spindle of a sawing device

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US51478A (en) * 1865-12-12 Improvement in centering circular saws
US114926A (en) * 1871-05-16 Improvement in methods of attaching saws to their arbors
US3623281A (en) * 1969-06-16 1971-11-30 Robert H Moffat Mounting fixture
DE19601522A1 (en) 1996-01-17 1997-07-24 Hilti Ag Wall saw and saw blade
EP2269286B1 (en) * 2008-02-29 2021-11-24 Husqvarna AB Electric saw
DE102011085561A1 (en) * 2011-06-06 2012-12-06 Robert Bosch Gmbh Hand machine tool fixture
US9089989B2 (en) * 2012-12-31 2015-07-28 Robert Bosch Gmbh Geared bolt system for securing a circular saw blade
JP6287205B2 (en) * 2013-12-27 2018-03-07 日立工機株式会社 Power working machine
JP6478409B2 (en) * 2015-08-18 2019-03-06 株式会社マキタ Work tools
US10906153B2 (en) * 2018-06-01 2021-02-02 Makita Corporation Work tool
US11052475B2 (en) * 2018-11-27 2021-07-06 Zhejiang Burley Tools Co., Ltd. Rapid replacing structure for multi-purpose saw
IT201800010747A1 (en) * 2018-11-30 2020-05-30 Gmm S P A Tool holder assembly of a machine for processing block or sheet materials, a machine including this group and method for processing block or sheet materials

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WO2019120925A1 (en) 2019-06-27
EP3727770A1 (en) 2020-10-28
EP3501766A1 (en) 2019-06-26
US20200376704A1 (en) 2020-12-03
US11597117B2 (en) 2023-03-07

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