EP1581373B1 - Manual circular sawing machine - Google Patents

Manual circular sawing machine Download PDF

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Publication number
EP1581373B1
EP1581373B1 EP03814443.2A EP03814443A EP1581373B1 EP 1581373 B1 EP1581373 B1 EP 1581373B1 EP 03814443 A EP03814443 A EP 03814443A EP 1581373 B1 EP1581373 B1 EP 1581373B1
Authority
EP
European Patent Office
Prior art keywords
saw
depth
portable circular
circular saw
cutting
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
EP03814443.2A
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German (de)
French (fr)
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EP1581373A1 (en
Inventor
Heiko Roehm
Eduard Gansel
Wolfgang Fuchs
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.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Publication of EP1581373A1 publication Critical patent/EP1581373A1/en
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Classifications

    • 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
    • B27B9/00—Portable power-driven circular saws for manual operation
    • B27B9/02—Arrangements for adjusting the cutting depth or the amount of tilting
    • 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
    • B27B9/00—Portable power-driven circular saws for manual operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
    • B27G19/02—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws
    • B27G19/04—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws for manually-operated power-driven circular saws

Definitions

  • the present invention relates to a hand-held circular saw comprising a saw unit with a housing which engages around a motor and a driven by the motor saw blade, the saw unit is adjustable pivotably mounted relative to a base plate between minimum and maximum depth of cut and the hand-held circular saw alone by means of a fixed handle connected to a foot plate is manageable and feasible.
  • the JP S59 167202 K1 discloses such a circular saw machine.
  • the saw unit is essentially uncoupled from handling forces, in particular from the handle. A decoupling occurs but only at a standstill to adjust the depth of cut.
  • the present invention with the features of claim 1 has the advantage that in the backstroke the saw unit with the saw blade of the - usually acting on the saw blade according to the state of the art - handling forces of the operator can be decoupled. As a result, it remains out of the suddenly converted rotational energy the saw blade resulting translational pulse smaller, because the saw unit is first accelerated upwards relative to the base plate in its safety position. During this period, the base plate of the portable circular saw does not lift off the workpiece, the pendulum protective hood closes. If the portable circular saw still jumps from the workpiece, the saw blade no longer protrudes under the footplate or is covered by the pendulum protective hood. As a result, the operator is not endangered by the rotating saw blade.
  • the portable circular saw can be handled and guided solely by means of the handle firmly connected to the foot plate, the saw unit can be decoupled in a simple manner from the handling forces exerted by the operator.
  • the saw unit by means of overload clutch relative to the base plate is pivotally releasable, it can dodge in the case of a kickback to the fulcrum of the depth adjustment, the saw unit is accelerated with the saw blade to a position above the base plate, so that even with subsequent lifting of the base plate From the workpiece a risk of injury to the saw blade is excluded.
  • the portable circular saw can be conveniently and safely placed on a base with the foot plate, without the pendulum protection cover resting on it.
  • FIG. 1 shows a side view of the circular saw 10 from the right, which consists of a saw unit 12, which is composed essentially of a motor housing 14 and a protective hood 16.
  • the recorded in the motor housing 14, not shown motor is used to drive a saw blade 18, which is partially encompassed by the protective cover 16.
  • the saw unit 12 is supported by a base plate 22, which serves for secure support on a workpiece, not shown, and facilitates sawing with a certain depth of cut, wherein the saw blade 18 protrudes more or less far below the base plate 22.
  • the saw unit 12 is mounted relative to the base plate 22 about a geometrical axis 20 parallel to the saw blade axis 19 and pivoted down.
  • a geometric axis 20 forming joint 20 ' is supported by a pivot arm 36, which in turn is pivotally mounted relative to the base plate 22 about an axis perpendicular to the saw blade axis 19 35 - to set a Gehrungsposition of the saw blade 18.
  • the saw unit 12 If the saw unit 12 is pivoted down about the joint 20 to the maximum depth of cut, it will strike the pivot arm 36.
  • the saw blade 18 has a maximum projection down beyond the foot plate 22 addition.
  • the operator has the saw unit 12 with one hand, e.g. to take on the guard 16 and press the foot plate 22 out.
  • the locking coupling 44 engages the locking piece 40, which is locked in this illustration in its lowest position by means of the wing nut 45.
  • handle 24 is rigidly connected to the pivot arm 36 and not pivotable as in known circular saws together with the saw unit for adjusting the depth of cut relative to the base plate 22.
  • the handle 24 carries in the upper part of a button-like button 28th for releasing a switch-on lock, with which a switch button 26 can be locked for switching on the saw unit drive. Only when the button 28 is kept pressed can the button 26 be depressed.
  • the protective cover 16 carries an additional handle 34, on which the operator with his second hand, the portable circular saw 10 can lead very safe.
  • the saw unit 12 is pivotally connected to the base plate 22 in two degrees of freedom ( FIG. 5, 6
  • the pivoting arm 36 is supported relative to the base plate 22 by two pivot joints 37 which form a pivot axis 35 parallel to the saw blade 18 and to the base plate 22.
  • the saw unit 12 is mounted with the pivot arm 36 for sawing miter angles so that the saw blade 18 in pivotal positions between 90 ° to 45 ° relative to the base plate 22 can be locked.
  • the pivot arm 36 can be adjusted by means of two pivoting scenes 56, 57 and associated Schwenkarretierungen 58, 59 in lockable selectable pivotal positions relative to the base plate 22.
  • the pivot arm 36 carries the hinge 20, around which the saw unit 12 is pivotally mounted relative to the base plate 22 for adjusting the depth of cut.
  • the joint 20 is arranged in the viewing direction on the right, ie near the front end face of the base plate 22 of the circular saw 10, while on the opposite side, i. behind, on the pivot arm 36, a cutting depth guide 38 is arranged, which is designed as a circular arc around the hinge 20 curved sheet metal strip on which the protective cover 16 by means of the locking piece 40 and the wing nut 45 is arranged lockable.
  • the cutting depth guide 38 has an unspecified longitudinal slot through which the locking piece 40 and the wing nut 45 engage, wherein the locking piece 40 can be continuously positioned in the longitudinal slot between an upper and lower end position and fixed by means of the wing nut 45.
  • the saw unit 12 In the upper end position of the locking piece 40, the saw unit 12 is pivoted so far up that the saw blade 18 and the swing guard 17 are so above the base plate 22 that they do not protrude below this.
  • a latching hook 42 is arranged in a rear, spaced from the saw blade 18 region, which is coupled via a coupling spring 46 elastically with the protective cover 16.
  • the latching hook 42 is swingably pivotable about an axis 43 and engages with a latching edge 54 under a Arretierflanke 52 of the locking piece 40 when the saw unit 12 is far enough down to the base plate 22 toward pivoted. Then, the latching hook 42 slides over the front region of the locking piece 40 in an arresting manner, wherein the latching flank 54 holds under the arresting flank 52.
  • flank angle of the arresting edge and the latching edge 52, 54 are selected so that at a certain critical force, which seeks to turn the saw unit 12 upwards around the hinge, the locking edge 54 can be released from the Arretierflanke 52, so that the Locking coupling 44 is open and the saw unit 12 can be accelerated by the lifting spring 48 in its upper end position.
  • Sets a corresponding setback that is, the saw unit 12 is accelerated upward without the foot plate 22 stands out from the workpiece. Only when the saw unit 12 has reached its upper end position, in which the saw blade 18 no longer protrudes under the base plate 22, the base plate 18 can follow the upward movement of the saw unit 12. In this case, the base plate 22 can lift from the workpiece and possibly also touch the operator, without this would be endangered by the saw blade 18.
  • the release force of the clutch 44 is defined in addition to the flank angles 52, 54 by the forces of the springs 46 and 48, wherein the clutch spring 46 to close the locking clutch 44 but the lifting spring 48, the latching coupling 44 seeks to open. In all cutting depths, the closing force caused by the spring 46 on the sensing coupling 44 is greater than the opening force caused by the spring 48.
  • FIG. 2 shows the circular saw 10 shortly before reaching the upper end position of the saw unit 12. It is clearly seen that the locking coupling 44 is released, so that the latching hook 42 is out of engagement with the locking piece 40 and pressed the saw unit 12 via a lifting spring 48 in its upper end position becomes.
  • FIG. 1 explained features or reference numerals should not be discussed again at this point.
  • FIG. 3 shows the circular saw 10 from the left side, wherein over the FIGS. 1 and 2
  • the lifting spring 48 is shown particularly clearly, which seeks to pivot the saw unit 12 relative to the base plate 22 and against the pivot arm 36 upwards.
  • FIG. 1 and 2 the front pivot gate 56 with the front pivot lock 58 can be seen.
  • the angular adjustment of the saw unit 12 and the saw blade 18 relative to the base plate 22 is lockable adjustable.
  • FIG. 4 shows a plan view of the portable circular saw 10 according to the invention
  • the base plate 22 has rounded corner regions and on the pivot arm 36 is pivotable and about pivoting scenes 56, 57 and pivot locks 58, 59 can be detected.
  • the pivot arm 36 has a bent-up tab 360 to which the handle 24 is fixedly connected.
  • the pivot arm 36 can be adjusted via the handle 24 in its angular position or miter position together with the saw unit 12. Since the pivot arm 36 carries the joint 20, on which the saw unit 12 is mounted up and down or depth adjustable, the handle 24 is decoupled in the up and down pivotal movement of the saw unit 12 of this and stored independently of this.
  • FIG. 5 shows a side view of the base plate 22 without saw unit 12 and handle 24, wherein clearly the pivot arm 36 with its pivot joints 37 and thus in its pivoting relative to the base plate 22 can be seen and wherein the front upwardly directed area with the joint 20 as a rigid connector to the articulated arm 36 and the rear disposed cutting depth guide 38 as a rigid part of the articulated arm 36 and the bent-up lobes 360 as an abutment of the handle 24 can be seen.
  • FIG. 6 shows a plan view of FIG. 5 , wherein the pivot arm 36, the depth of cut guide 38 with the longitudinal slot 39 and a scale not shown in detail is recognizable, at which the depth of cut is controlled adjustable.
  • the detent coupling 44 by means of button or button by hand, so that more comfortable and faster a locking position for parking the portable circular saw is adjustable.
  • the upper end position of the saw unit 12 relative to the base plate 22 is latched lockable and releasable by pressing a button, as is customary in diving saws per se.
  • this feature is optional or not mandatory.

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

Description

Die vorliegende Erfindung geht aus von einer Handkreissägemaschine bestehend aus einem Sägeaggregat mit einem Gehäuse, das einen Motor und ein vom Motor antreibbares Sägeblatt umgreift, wobei das Sägeaggregat gegenüber einer Fußplatte zwischen minimaler und maximaler Schnitttiefe einstellbar schwenkbar gelagert ist und wobei die Handkreissägemaschine allein mittels eines fest mit einer Fußplatte verbundenen Handgriffs handhabbar und führbar ist. Die JP S59 167202 K1 offenbart eine solche Handkreissägemaschine. Das Sägeaggregat ist von Handhabungskräften, insbesondere vom Handgriff, im wesentlichen entkoppelbar. Eine Entkoppelung erfolgt aber nur im Stillstand, um die Schnitttiefe einzustellen.The present invention relates to a hand-held circular saw comprising a saw unit with a housing which engages around a motor and a driven by the motor saw blade, the saw unit is adjustable pivotably mounted relative to a base plate between minimum and maximum depth of cut and the hand-held circular saw alone by means of a fixed handle connected to a foot plate is manageable and feasible. The JP S59 167202 K1 discloses such a circular saw machine. The saw unit is essentially uncoupled from handling forces, in particular from the handle. A decoupling occurs but only at a standstill to adjust the depth of cut.

Es sind Handkreissägemaschinen bekannt, die entweder als Tauch- oder Pendelschutzhauben-Kreissäge ausgestaltet sind, beispielsweise gemäß US 4,856,394 , und die den Nachteil haben, dass sie im Rückschlagfall vom Werkstück wegspringen und unkontrolliert den Bedienenden treffen können, so dass dieser durch das unter der Fußplatte hervorragende, rotierende Sägeblatt verletzt werden kann.There are Handkreissägemaschinen known, which are designed either as diving or pendulum hood circular saw, for example according to US 4,856,394 , And have the disadvantage that they can jump in the fallback of the workpiece and uncontrolled meet the operator, so that it can be injured by the outstanding under the base plate, rotating blade.

Ein Rückschlag tritt bei Handkreissägen immer dann auf, wenn beim Sägen die sich von oben nach unten drehende Seite des Sägeblatts mit ihren Sägezähnen von oben auf das Werkstück trifft bzw. sich im Schnittkanal verhakt. Dadurch wird die Rotationsenergie des Sägeblatts bzw. aller drehenden Teile der Handkreissäge schlagartig in Translationsenergie umgewandelt, so daß sich die Handkreissäge vom Werkstück katapultiert bzw. zumindest abhebt und dadurch den Bedienenden gefährdet.In the case of circular saws, kickback always occurs when, during sawing, the side of the saw blade turning from top to bottom hits the workpiece from above with its saw teeth or engages in the cutting channel. As a result, the rotational energy of the saw blade or all rotating parts of the portable circular saw is suddenly converted into translational energy, so that catapults the portable circular saw from the workpiece or at least lifts and thereby endangers the operator.

Vorteile der ErfindungAdvantages of the invention

Die vorliegende Erfindung mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass im Rückschlagfall das Sägeaggregat mit dem Sägeblatt von den - nach dem Stand der Technik üblicherweise auf das Sägeblatt wirkenden - Handhabungskräften des Bedienenden entkoppelbar ist. Dadurch bleibt der aus der schlagartig umgewandelten Rotationsenergie des Sägeblatts resultierende Translationsimpuls kleiner, weil das Sägeaggregat zunächst gegenüber der Fußplatte in seine Sicherheitsposition nach oben beschleunigt wird. In dieser Zeitspanne hebt die Fußplatte der Handkreissäge noch nicht vom Werkstück ab, die Pendelschutzhaube schließt sich dabei. Springt dann die Handkreissäge trotzdem noch vom Werkstück, ragt das Sägeblatt nicht mehr unter der Fußplatte hervor bzw. ist durch die Pendelschutzhaube abgedeckt. Dadurch ist der Bedienende durch das rotierende Sägeblatt nicht gefährdet.The present invention with the features of claim 1 has the advantage that in the backstroke the saw unit with the saw blade of the - usually acting on the saw blade according to the state of the art - handling forces of the operator can be decoupled. As a result, it remains out of the suddenly converted rotational energy the saw blade resulting translational pulse smaller, because the saw unit is first accelerated upwards relative to the base plate in its safety position. During this period, the base plate of the portable circular saw does not lift off the workpiece, the pendulum protective hood closes. If the portable circular saw still jumps from the workpiece, the saw blade no longer protrudes under the footplate or is covered by the pendulum protective hood. As a result, the operator is not endangered by the rotating saw blade.

Dadurch, dass die Handkreissäge allein mittels des fest mit der Fußplatte verbundenen Handgriffs handhabbar und führbar ist, ist das Sägeaggregat auf einfache Weise von den vom Bediener ausgeübten Handhabungskräften entkoppelbar.Because the portable circular saw can be handled and guided solely by means of the handle firmly connected to the foot plate, the saw unit can be decoupled in a simple manner from the handling forces exerted by the operator.

Dadurch, dass das Sägeaggregat mittels Überlastkupplung gegenüber der Fußplatte schwenkbar lösbar ist, kann es im Fall eines Rückschlages um den Drehpunkt der Schnittiefeneinstellung ausweichen, wobei das Sägeaggregat mit dem Sägeblatt in eine Position oberhalb der Fußplatte beschleunigt wird, so dass auch bei nachfolgendem Abheben der Fußplatte vom Werkstück eine Verletzungsgefahr durch das Sägeblatt auszuschließen ist.Characterized in that the saw unit by means of overload clutch relative to the base plate is pivotally releasable, it can dodge in the case of a kickback to the fulcrum of the depth adjustment, the saw unit is accelerated with the saw blade to a position above the base plate, so that even with subsequent lifting of the base plate From the workpiece a risk of injury to the saw blade is excluded.

Dadurch, dass das Sägeaggregat im Falle eines Rückschlages nach Erreichen seiner Sicherheitsposition in dieser arretierbar ist, wird verhindert, dass das noch rotierende Sägeblatt vom Bedienenden ungewollt wieder unter die Fußplatte in Richtung höhere Schnitttiefe herausgeschwenkt wird und ihn verletzt.The fact that the saw unit is in the event of a setback after reaching its safety position locked in this, it is prevented that the still rotating saw blade is unintentionally swung out again under the foot plate in the direction of higher cutting depth by the operator and injured him.

Dadurch, dass die Kupplung auch von Hand auslösbar ist, kann die Handkreissäge bequem und sicher mit der Fußplatte auf einer Unterlage abgestellt werden, ohne dass auf dieser die Pendelschutzhaube aufliegt.Due to the fact that the coupling can also be released by hand, the portable circular saw can be conveniently and safely placed on a base with the foot plate, without the pendulum protection cover resting on it.

Zeichnungdrawing

Nachstehend ist die Erfindung anhand eines Ausführungsbeispiels mit zugehöriger Zeichnung näher erläutert.The invention is explained in more detail with reference to an embodiment with associated drawing.

Es zeigen

Figur 1
eine Seitenansicht der sägebereiten, erfindungsgemäßen Handkreissäge mit arretierter Kupplung von rechts
Figur 2
die Seitenansicht gemäß Figur 1 mit gelöster Kupplung Figur 3 eine Seitenansicht der Handkreissäge von links
Figur 4
eine Draufsicht der Handkreissäge, teilweise geschnitten,
Figur 5
einen Längsschnitt der Fußplatte mit Schwenkarm ohne Sägeaggregat und
Figur 6
eine Draufsicht der Fußplatte gemäß Figur 5.
Show it
FIG. 1
a side view of Sägebereiten invention Circular saw with locked coupling from the right
FIG. 2
the side view according to FIG. 1 with disengaged clutch FIG. 3 a side view of the circular saw from the left
FIG. 4
a top view of the circular saw, partially cut,
FIG. 5
a longitudinal section of the base plate with swivel arm without sawing unit and
FIG. 6
a plan view of the base plate according to FIG. 5 ,

Ausführungsbeispieleembodiments

Figur 1 zeigt eine Seitenansicht der Handkreissäge 10 von rechts, die aus einem Sägeaggregat 12 besteht, das sich im Wesentlichen aus einem Motorgehäuse 14 sowie einer Schutzhaube 16 zusammensetzt. Der im Motorgehäuse 14 aufgenommene, nicht dargestellte Motor dient dem Antrieb eines Sägeblatts 18, das bereichsweise von der Schutzhaube 16 umgriffen wird. Dabei wird das Sägeaggregat 12 von einer Fußplatte 22 getragen, die zur sicheren Auflage auf ein nicht dargestelltes Werkstück dient und das Sägen mit einer bestimmten Schnittiefe erleichtert, wobei das Sägeblatt 18 mehr oder weniger weit unter der Fußplatte 22 herausragt. FIG. 1 shows a side view of the circular saw 10 from the right, which consists of a saw unit 12, which is composed essentially of a motor housing 14 and a protective hood 16. The recorded in the motor housing 14, not shown motor is used to drive a saw blade 18, which is partially encompassed by the protective cover 16. In this case, the saw unit 12 is supported by a base plate 22, which serves for secure support on a workpiece, not shown, and facilitates sawing with a certain depth of cut, wherein the saw blade 18 protrudes more or less far below the base plate 22.

Das Sägeaggregat 12 ist relativ zur Fußplatte 22 um eine geometrische Achse 20 parallel zur Sägeblattachse 19 auf- und niederschwenkbar gelagert. Ein die geometrische Achse 20 bildendes Gelenk 20' wird von einem Schwenkarm 36 getragen, der seinerseits gegenüber der Fußplatte 22 um eine zur Sägeblattachse 19 rechtwinklige Achse 35 - zur Einstellung einer Gehrungsposition des Sägeblatts 18 - schwenkbar gelagert ist.The saw unit 12 is mounted relative to the base plate 22 about a geometrical axis 20 parallel to the saw blade axis 19 and pivoted down. A geometric axis 20 forming joint 20 'is supported by a pivot arm 36, which in turn is pivotally mounted relative to the base plate 22 about an axis perpendicular to the saw blade axis 19 35 - to set a Gehrungsposition of the saw blade 18.

Ist das Sägeaggregat 12 um das Gelenk 20 bis zur maximalen Schnitttiefe nach unten geschwenkt, schlägt es am Schwenkarm 36 an. Dabei hat das Sägeblatt 18 einen maximalen Überstand nach unten über die Fußplatte 22 hinaus. Dazu ist vom Bedienenden das Sägeaggregat 12 mit einer Hand, z.B. an der Schutzhaube 16 zu ergreifen und zur Fußplatte 22 hin zu drücken. Dabei rastet die Rastkupplung 44 am Arretierstück 40 ein, das in dieser Darstellung in seiner tiefsten Position mittels der Flügelmutter 45 arretiert ist.If the saw unit 12 is pivoted down about the joint 20 to the maximum depth of cut, it will strike the pivot arm 36. The saw blade 18 has a maximum projection down beyond the foot plate 22 addition. For this purpose, the operator has the saw unit 12 with one hand, e.g. to take on the guard 16 and press the foot plate 22 out. In this case, the locking coupling 44 engages the locking piece 40, which is locked in this illustration in its lowest position by means of the wing nut 45.

Ein in der Zeichenebene der Figur 1 hinter der Schutzhaube 16 angeordneter Handgriff 24 ist starr mit dem Schwenkarm 36 verbunden und nicht wie bei bekannten Handkreissägen gemeinsam mit dem Sägeaggregat zum Einstellen der Schnitttiefe relativ zur Fußplatte 22 schwenkbar. Der Handgriff 24 trägt im oberen Bereich einen tastenartigen Knopf 28 zum Lösen einer Einschaltsperre, mit der eine Schalttaste 26 zum Einschalten des Sägeaggregatantriebs arretierbar ist. Nur wenn der Knopf 28 gedrückt gehalten wird, kann die Schalttaste 26 niedergedrückt werden.One in the drawing plane of the FIG. 1 behind the guard 16 arranged handle 24 is rigidly connected to the pivot arm 36 and not pivotable as in known circular saws together with the saw unit for adjusting the depth of cut relative to the base plate 22. The handle 24 carries in the upper part of a button-like button 28th for releasing a switch-on lock, with which a switch button 26 can be locked for switching on the saw unit drive. Only when the button 28 is kept pressed can the button 26 be depressed.

Aus dem Handgriff 24 tritt unten hinten eine Netzleitung 30 zur Stromversorgung des Sägeaggregatsantriebs aus. In Betrachtungsrichtung rechts, d.h. vorn, trägt die Schutzhaube 16 einen Zusatzhandgriff 34, an dem der Bedienende mit seiner zweiten Hand die Handkreissäge 10 besonders sicher führen kann.From the handle 24 occurs at the bottom behind a power line 30 to power the Sägeaggregatsantriebs. In the viewing direction to the right, i. front, the protective cover 16 carries an additional handle 34, on which the operator with his second hand, the portable circular saw 10 can lead very safe.

Das Sägeaggregat 12 ist gegenüber der Fußplatte 22 in zwei Freiheitsgraden schwenkbar verbunden (Figur 5, 6), - sowohl über das Gelenk 20 relativ zum Schwenkarm 36 als auch über den Schwenkarm 36 selbst. Dabei ist der Schwenkarm 36 gegenüber der Fußplatte 22 über zwei Schwenkgelenke 37 gelagert, die parallel zum Sägeblatt 18 und zur Fußplatte 22 eine Schwenkachse 35 bilden. Damit ist das Sägeaggregat 12 mit dem Schwenkarm 36 zum Sägen von Gehrungswinkeln so gelagert, dass das Sägeblatt 18 in Schwenkpositionen zwischen 90° bis 45° gegenüber der Fußplatte 22 arretierbar ist. Der Schwenkarm 36 kann dabei mittels zweier Schwenkkulissen 56, 57 sowie zugehörigen Schwenkarretierungen 58, 59 in feststellbar wählbare Schwenkpositionen gegenüber der Fußplatte 22 eingestellt werden.The saw unit 12 is pivotally connected to the base plate 22 in two degrees of freedom ( FIG. 5, 6 The pivoting arm 36 is supported relative to the base plate 22 by two pivot joints 37 which form a pivot axis 35 parallel to the saw blade 18 and to the base plate 22. Thus, the saw unit 12 is mounted with the pivot arm 36 for sawing miter angles so that the saw blade 18 in pivotal positions between 90 ° to 45 ° relative to the base plate 22 can be locked. The pivot arm 36 can be adjusted by means of two pivoting scenes 56, 57 and associated Schwenkarretierungen 58, 59 in lockable selectable pivotal positions relative to the base plate 22.

Der Schwenkarm 36 trägt das Gelenk 20, um das das Sägeaggregat 12 gegenüber der Fußplatte 22 zum Einstellen der Schnitttiefe schwenkbar gelagert ist. Das Gelenk 20 ist in Betrachtungsrichtung rechts, also nahe der vorderen Stirnseite der Fußplatte 22 der Handkreissäge 10 angeordnet, während auf der gegenüberliegenden Seite, d.h. hinten, auf dem Schwenkarm 36 eine Schnitttiefenführung 38 angeordnet ist, die als kreisbogenförmig um das Gelenk 20 gekrümmter Blechstreifen ausgestaltet ist, an dem die Schutzhaube 16 mittels des Arretierstücks 40 bzw. der Flügelmutter 45 feststellbar angeordnet ist. Die Schnitttiefenführung 38 weist einen nicht näher bezeichneten Längsschlitz auf, durch den hindurch das Arretierstück 40 bzw. die Flügelmutter 45 greifen, wobei das Arretierstück 40 im Längsschlitz zwischen einer oberen und unteren Endposition stufenlos positioniert und dazu mittels der Flügelmutter 45 festgelegt werden kann.The pivot arm 36 carries the hinge 20, around which the saw unit 12 is pivotally mounted relative to the base plate 22 for adjusting the depth of cut. The joint 20 is arranged in the viewing direction on the right, ie near the front end face of the base plate 22 of the circular saw 10, while on the opposite side, i. behind, on the pivot arm 36, a cutting depth guide 38 is arranged, which is designed as a circular arc around the hinge 20 curved sheet metal strip on which the protective cover 16 by means of the locking piece 40 and the wing nut 45 is arranged lockable. The cutting depth guide 38 has an unspecified longitudinal slot through which the locking piece 40 and the wing nut 45 engage, wherein the locking piece 40 can be continuously positioned in the longitudinal slot between an upper and lower end position and fixed by means of the wing nut 45.

In der oberen Endposition des Arretierstücks 40 ist das Sägeaggregat 12 so weit nach oben verschwenkt, dass das Sägeblatt 18 und die Pendelschutzhaube 17 sich derart oberhalb der Fußplatte 22 befinden, dass sie nicht unter dieser herausragen.In the upper end position of the locking piece 40, the saw unit 12 is pivoted so far up that the saw blade 18 and the swing guard 17 are so above the base plate 22 that they do not protrude below this.

An der Schutzhaube ist in einem hinteren, vom Sägeblatt 18 beabstandeten Bereich ein Rasthaken 42 angeordnet, der über eine Kupplungsfeder 46 elastisch mit der Schutzhaube 16 gekoppelt ist. Der Rasthaken 42 ist um eine Achse 43 pendelartig verschwenkbar und greift mit einer Rastflanke 54 unter eine Arretierflanke 52 des Arretierstücks 40, wenn das Sägeaggregat 12 weit genug nach unten, zur Fußplatte 22 hin geschwenkt wird. Dann gleitet der Rasthaken 42 überrastend über den Frontbereich des Arretierstücks 40, wobei sich die Rastflanke 54 unter der Arretierflanke 52 festhält. Dazu sind die Flankenwinkel der Arretierflanke und der Rastflanke 52, 54 so gewählt, dass bei einer bestimmten, kritischen Kraft, die das Sägeaggregat 12 nach oben um das Gelenk zu drehen sucht, sich die Rastflanke 54 von der Arretierflanke 52 lösen kann, so dass die Rastkupplung 44 geöffnet ist und das Sägeaggregat 12 unterstützt von der Hubfeder 48 in seine obere Endlage beschleunigt werden kann. Setzt ein entsprechender Rückschlag ein, wird also das Sägeaggregat 12 nach oben beschleunigt, ohne dass die Fußplatte 22 sich dabei vom Werkstück abhebt. Erst, wenn das Sägeaggregat 12 seine obere Endlage erreicht hat, in der das Sägeblatt 18 nicht mehr unter der Fußplatte 22 hindurchragt, kann die Fußplatte 18 der nach oben gerichteten Bewegung des Sägeaggregats 12 folgen. Dabei kann sich die Fußplatte 22 vom Werkstück heben und möglicherweise auch den Bedienenden berühren, ohne dass dieser durch das Sägeblatt 18 gefährdet wäre.On the guard, a latching hook 42 is arranged in a rear, spaced from the saw blade 18 region, which is coupled via a coupling spring 46 elastically with the protective cover 16. The latching hook 42 is swingably pivotable about an axis 43 and engages with a latching edge 54 under a Arretierflanke 52 of the locking piece 40 when the saw unit 12 is far enough down to the base plate 22 toward pivoted. Then, the latching hook 42 slides over the front region of the locking piece 40 in an arresting manner, wherein the latching flank 54 holds under the arresting flank 52. For this purpose, the flank angle of the arresting edge and the latching edge 52, 54 are selected so that at a certain critical force, which seeks to turn the saw unit 12 upwards around the hinge, the locking edge 54 can be released from the Arretierflanke 52, so that the Locking coupling 44 is open and the saw unit 12 can be accelerated by the lifting spring 48 in its upper end position. Sets a corresponding setback, that is, the saw unit 12 is accelerated upward without the foot plate 22 stands out from the workpiece. Only when the saw unit 12 has reached its upper end position, in which the saw blade 18 no longer protrudes under the base plate 22, the base plate 18 can follow the upward movement of the saw unit 12. In this case, the base plate 22 can lift from the workpiece and possibly also touch the operator, without this would be endangered by the saw blade 18.

Die Lösekraft der Kupplung 44 wird neben den Flankenwinkeln 52, 54 durch die Kräfte der Federn 46 und 48 definiert, wobei die Kupplungsfeder 46 die Rastkupplung 44 zu schliessen aber die Hubfeder 48 die Rastkupplung 44 zu öffen sucht. In allen Schnittiefenpositionen ist die von der Feder 46 bewirkte Schliesskraft auf die Tastkupplung 44 grösser als die von der Feder 48 bewirkte Öffnungskraft.The release force of the clutch 44 is defined in addition to the flank angles 52, 54 by the forces of the springs 46 and 48, wherein the clutch spring 46 to close the locking clutch 44 but the lifting spring 48, the latching coupling 44 seeks to open. In all cutting depths, the closing force caused by the spring 46 on the sensing coupling 44 is greater than the opening force caused by the spring 48.

Figur 2 zeigt die Handkreissäge 10 kurz vor Erreichen der oberen Endposition des Sägeaggregats 12. Dabei ist deutlich erkennbar, dass die Rastkupplung 44 gelöst ist, so dass der Rasthaken 42 außer Eingriff zum Arretierstück 40 ist und das Sägeaggregat 12 über eine Hubfeder 48 in seine obere Endposition gedrückt wird. FIG. 2 shows the circular saw 10 shortly before reaching the upper end position of the saw unit 12. It is clearly seen that the locking coupling 44 is released, so that the latching hook 42 is out of engagement with the locking piece 40 and pressed the saw unit 12 via a lifting spring 48 in its upper end position becomes.

Auf die übrigen schon zu Figur 1 erläuterten Merkmale bzw. Bezugszeichen soll an dieser Stelle nicht noch einmal eingegangen werden.To the rest already too FIG. 1 explained features or reference numerals should not be discussed again at this point.

Figur 3 zeigt die Handkreissäge 10 von der linken Seite, wobei über die Figuren 1 und 2 hinausgehend die Hubfeder 48 besonders deutlich dargestellt ist, die das Sägeaggregat 12 gegenüber der Fußplatte 22 bzw. gegenüber dem Schwenkarm 36 nach oben zu schwenken sucht. FIG. 3 shows the circular saw 10 from the left side, wherein over the FIGS. 1 and 2 In addition, the lifting spring 48 is shown particularly clearly, which seeks to pivot the saw unit 12 relative to the base plate 22 and against the pivot arm 36 upwards.

Besonders deutlich und über Figur 1 und 2 hinausgehend ist auch die vordere Schwenkkulisse 56 mit der vorderen Schwenkarretierung 58 erkennbar. Über die Schwenkkulisse 56 und die zugehörige Schwenkarretierung 58 ist die Winkelverstellung des Sägeaggregats 12 bzw. des Sägeblatts 18 gegenüber der Fußplatte 22 arretierbar einstellbar.Especially clear and over FIG. 1 and 2 In addition, the front pivot gate 56 with the front pivot lock 58 can be seen. About the pivoting gate 56 and the associated pivot lock 58, the angular adjustment of the saw unit 12 and the saw blade 18 relative to the base plate 22 is lockable adjustable.

Figur 4 zeigt eine Draufsicht der erfindungsgemäßen Handkreissäge 10, deren Fußplatte 22 abgerundete Eckbereiche hat und auf der der Schwenkarm 36 schwenkbar und über Schwenkkulissen 56, 57 bzw. Schwenkarretierungen 58, 59 feststellbar ist. Der Schwenkarm 36 hat einen hochgebogenen Lappen 360, mit dem der Handgriff 24 fest verbunden ist. Damit kann der Schwenkarm 36 über den Handgriff 24 in seiner Winkellage bzw. Gehrungsposition gemeinsam mit dem Sägeaggregat 12 verstellt werden. Da der Schwenkarm 36 das Gelenk 20 trägt, an dem das Sägeaggregat 12 auf- und ab- bzw. tiefeneinstellbar gelagert ist, ist der Handgriff 24 bei der Auf- und Ab-Schwenkbewegung des Sägeaggregats 12 von diesem entkoppelt und unabhängig von diesem gelagert. FIG. 4 shows a plan view of the portable circular saw 10 according to the invention, the base plate 22 has rounded corner regions and on the pivot arm 36 is pivotable and about pivoting scenes 56, 57 and pivot locks 58, 59 can be detected. The pivot arm 36 has a bent-up tab 360 to which the handle 24 is fixedly connected. Thus, the pivot arm 36 can be adjusted via the handle 24 in its angular position or miter position together with the saw unit 12. Since the pivot arm 36 carries the joint 20, on which the saw unit 12 is mounted up and down or depth adjustable, the handle 24 is decoupled in the up and down pivotal movement of the saw unit 12 of this and stored independently of this.

Figur 5 zeigt eine Seitenansicht der Fußplatte 22 ohne Sägeaggregat 12 und Handgriff 24, wobei deutlich der Schwenkarm 36 mit seinen Schwenkgelenken 37 und damit in seiner Schwenkbarkeit gegenüber der Fußplatte 22 erkennbar ist und wobei der vordere nach oben gerichtete Bereich mit dem Gelenk 20 als starres Verbindungsstück zum Gelenkarm 36 und die hinten angeordneten Schnitttiefenführung 38 als starres Teil des Gelenkarms 36 sowie der hochgebogene Lappen 360 als Widerlager des Handgriffs 24 erkennbar ist. FIG. 5 shows a side view of the base plate 22 without saw unit 12 and handle 24, wherein clearly the pivot arm 36 with its pivot joints 37 and thus in its pivoting relative to the base plate 22 can be seen and wherein the front upwardly directed area with the joint 20 as a rigid connector to the articulated arm 36 and the rear disposed cutting depth guide 38 as a rigid part of the articulated arm 36 and the bent-up lobes 360 as an abutment of the handle 24 can be seen.

Figur 6 zeigt eine Draufsicht der Figur 5, wobei der Schwenkarm 36, die Schnitttiefenführung 38 mit dem Längsschlitz 39 und einer nicht näher bezeichneten Skala erkennbar ist, an der die Schnitttiefe kontrolliert einstellbar ist. FIG. 6 shows a plan view of FIG. 5 , wherein the pivot arm 36, the depth of cut guide 38 with the longitudinal slot 39 and a scale not shown in detail is recognizable, at which the depth of cut is controlled adjustable.

Bei einem weiteren, nicht dargestellten Ausführungsbeispiel der Erfindung ist die Rastkupplung 44 mittels Taste bzw. Knopf von Hand lösbar, so dass dadurch bequemer und schneller eine Rastposition zum Abstellen der Handkreissäge einstellbar ist.In a further, not shown embodiment of the invention, the detent coupling 44 by means of button or button by hand, so that more comfortable and faster a locking position for parking the portable circular saw is adjustable.

Bei einem weiteren Ausführungsbeispiel der Erfindung ist die obere Endposition des Sägeaggregats 12 gegenüber der Fußplatte 22 überrastbar arretierbar und mittels Tastendruck lösbar, so wie dies bei Tauchsägen an sich üblich ist. Da die erfindungsgemäße Säge jedoch über eine Pendelschutzhaube verfügt, ist dieses Merkmal fakultativ bzw. nicht zwingend notwendig.In a further embodiment of the invention, the upper end position of the saw unit 12 relative to the base plate 22 is latched lockable and releasable by pressing a button, as is customary in diving saws per se. However, since the saw according to the invention has a pendulum protective hood, this feature is optional or not mandatory.

Claims (7)

  1. Portable circular saw machine (10) consisting of a saw unit (12) having a housing (14, 16) which engages around a motor and a saw blade (18) that is drivable by the motor, wherein the saw unit (12) is mounted pivotably so as to be settable between a minimum and maximum cutting depth with respect to a sole plate (22), and wherein the portable circular saw machine (10) is manipulable and guidable solely by means of a handle (24) that is firmly connected to a pivot arm (36) or a sole plate (22), wherein the saw unit (12) is able to be substantially decoupled from handling forces that act on the saw blade (18) during sawing, in particular from the handle (24), in that the saw unit (12) is able to be coupled to cutting-depth setting means (38, 39, 45) via a force-dependent clutch (44) such that, in the event of kickback, the cutting-depth setting means (38, 39, 45) are automatically releasable and then the saw unit (12) can yield in a cutting-depth minimizing manner.
  2. Portable circular saw machine according to Claim 1, wherein the saw unit (12) is mounted on the pivot arm (36) in a depth-settable manner independently of the handle (24).
  3. Portable circular saw machine (10) according to Claim 1 or 2, wherein each cutting-depth position of the saw unit (12) is releasably lockable by means of an overload clutch (44), the releasing direction of which runs towards the minimum cutting depth.
  4. Portable circular saw machine according to Claim 3, wherein the overload clutch (44) is configured as a latching clutch (40, 42) and is arranged on that side of the protective hood (16) that is remote from the axle (20).
  5. Portable circular saw machine according to Claim 4, wherein the latching clutch (40, 42) consists of a locking piece (40) behind which a latching piece (42) is able to engage.
  6. Portable circular saw machine according to Claim 5, wherein the locking piece (40) and the latching piece (42) have mutually corresponding supporting surfaces (52, 54) which are supportable against one another in a manner extending at a corresponding determined angle to the direction of the trigger force, wherein the angle is selected such that the locking piece (40) and the latching piece (42) automatically detach from one another in the event of a particular minimum force that sets the saw unit (12) in the cutting depth "0" position.
  7. Portable circular saw machine according to Claim 4, wherein a release force of the latching clutch (44) is defined by a lifting spring (48) and a clutch spring (46) such that the release force is dependent on the set cutting depth.
EP03814443.2A 2002-12-30 2003-07-25 Manual circular sawing machine Expired - Lifetime EP1581373B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10261743A DE10261743A1 (en) 2002-12-30 2002-12-30 Manual circular saw B27B
DE10261743 2002-12-30
PCT/DE2003/002510 WO2004060621A1 (en) 2002-12-30 2003-07-25 Hand-held circular saw

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EP1581373A1 EP1581373A1 (en) 2005-10-05
EP1581373B1 true EP1581373B1 (en) 2016-04-20

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EP03814443.2A Expired - Lifetime EP1581373B1 (en) 2002-12-30 2003-07-25 Manual circular sawing machine

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US (1) US7975388B2 (en)
EP (1) EP1581373B1 (en)
JP (1) JP2006512228A (en)
CN (1) CN1720123B (en)
DE (1) DE10261743A1 (en)
WO (1) WO2004060621A1 (en)

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Also Published As

Publication number Publication date
WO2004060621A1 (en) 2004-07-22
DE10261743A1 (en) 2004-07-22
CN1720123B (en) 2012-05-23
US7975388B2 (en) 2011-07-12
US20050217124A1 (en) 2005-10-06
EP1581373A1 (en) 2005-10-05
CN1720123A (en) 2006-01-11
JP2006512228A (en) 2006-04-13

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