WO2012116837A1

WO2012116837A1 - Portable power tool

Info

Publication number: WO2012116837A1
Application number: PCT/EP2012/000949
Authority: WO
Inventors: Rudolf Fuchs
Original assignee: Robert Bosch Gmbh
Priority date: 2011-03-03
Filing date: 2012-03-02
Publication date: 2012-09-07
Also published as: DE102011005017A1

Abstract

The invention relates to a portable power tool having at least one coupling device (12a; 12b) which can be coupled to a power tool separation device consisting of at least one cutting unit (14a; 14b) and at least one guide unit (16a; 16b). According to the invention, said portable power tool comprises at least one boring ejection protection unit (20a; 20b).

Description

description

Portable machine tool

State of the art

Portable machine tools are already known which comprise a coupling device which can be coupled to a machine tool separating device formed by a cutting strand and a guide unit.

DISCLOSURE OF THE INVENTION The invention is based on a portable power tool having at least one coupling device which can be coupled to a power-tool separating device formed from at least one cutting strand and at least one guide unit. It is proposed that the portable power tool at least one

Spanausreißschutzeinheit includes. The machine tool and the tool guide unit preferably together form a tool system. A "portable power tool" is to be understood here in particular as meaning a power tool, in particular a power tool, which can be transported by an operator so that it can not be transported particularly preferably less than 5 kg.Particularly preferably, the portable machine tool comprises at least one drive unit for driving the cutting strand. The term "drive unit" is intended here to define in particular a unit which is provided for forces and / or

To generate torques for a drive of the cutting strand. Prefers For the generation of forces and / or torques by means of the drive unit thermal energy, chemical energy and / or electrical energy is converted into kinetic energy. In particular, the drive unit is formed directly and / or indirectly coupled to the cutting strand. Particularly preferably, the drive unit comprises at least one stator and at least one rotor, which has at least one armature shaft. Preferably, the drive unit is designed as an electric motor unit. However, it is also conceivable that the drive unit has another, to a professional appear appropriate design. A "coupling device" is to be understood here as meaning, in particular, a device which is intended to operatively connect the machine tool separating device to the portable machine tool by means of a positive and / or non-positive connection for machining a workpiece In the state of the coupling device, in an operating state of the portable power tool, forces and / or torques are transmitted from the drive unit of the portable power tool for driving the cutting strand to the power-tool parting device, thus, the coupling device is preferably designed as a tool receptacle.

A "cutting strand" is to be understood here as meaning, in particular, a unit which is intended to locally cancel the atomic cohesion of a workpiece to be machined, in particular by means of a mechanical separation and / or by means of a mechanical removal of material particles of the workpiece to separate the workpiece into at least two physically separate parts and / or to at least partially separate and / or remove material particles of the workpiece from a surface of the workpiece, particularly preferably along a circumference of the cutting strand in at least one operating state A "guide unit" is to be understood here as meaning, in particular, a unit which is provided with a constraining force at least along a direction perpendicular to a cutting direction of the cutting strand onto the cutting strand exercise to specify a possibility of movement of the cutting strand along the cutting direction. Preferably, the guide unit has at least one guide element, in particular a guide groove, through which the cutting strand is guided. Preferably, the cutting strand, viewed in a cutting plane, guided along an entire circumference of the guide unit by the guide unit by means of the guide element, in particular the guide groove. Preferably, the guide unit is designed as a sword. The term "sword" is intended here to define in particular a geometric shape which, viewed in the cutting plane, has a closed outer contour which comprises at least two mutually parallel straight lines and at least two respectively connecting ends of the straight lines connecting connecting sections, in particular circular arcs, Thus, the guide unit has a geometric shape which, viewed in the cutting plane, is composed of a rectangle and at least two circular sectors arranged on opposite sides of the rectangle

Cutting strand is moved in at least one operating state along a circumference of the guide unit in at least two mutually oppositely directed cutting directions relative to the guide unit. Preferably, the cutting plane is aligned at least substantially transversely to a machined workpiece surface when machining a workpiece. The term "at least essentially transversal" is to be understood here as meaning, in particular, an alignment of an plane and / or a direction relative to a further plane and / or a further direction, which preferably depends on a parallel orientation of the plane and / or the direction relative to However, it is also conceivable that the cutting plane is aligned at least substantially parallel to a machined workpiece surface when machining a workpiece, in particular when the cutting strand is designed as an abrasive, etc. Under "at least In this case, an orientation of a direction relative to a reference direction, in particular in a plane, is to be understood here, the direction relative to the reference direction having a deviation, in particular less than 8 °, advantageously less than 5 ° and particularly advantageously less than 2 ° ,

A "cutting direction" is to be understood here as meaning, in particular, a direction along which the cutting strand is used to produce a cutting gap and / or to separate and / or remove material particles of a workpiece to be machined in at least one operating state as a result of a driving force and / or a drive torque, in particular in the guide unit, is moved. Preferably, the cutting strand is moved in an operating state along the cutting direction relative to the guide unit. The cutting strand and the guide unit preferably together form a closed system. In particular, the term "closed system" is intended to define a system comprising at least two components that retain functionality and / or function in the system by interacting in a disassembled state of the system from a system-superior system, such as a portable machine tool Preferably, the at least two components of the closed system are at least substantially inseparably connected with each other for an operator. "At least substantially unsolvable" is to be understood here as meaning, in particular, a connection of at least two components which are only with the aid of assistance of separating tools, such as a saw, in particular a mechanical saw, etc., and / or chemical separating agents, such as solvents, etc., are separable from each other. The term "chip removal protection unit" is intended here to define in particular a unit which is intended to prevent chipping of chips at least in a region of a surface of the workpiece which adjoins a section which can be introduced by means of the machine tool cutting device when machining a workpiece by means of the machine tool cutting device In a machining of a workpiece, the chip break-out unit slides at least with a partial area on a surface of a workpiece to be machined, and the chip break-out protection unit preferably comprises at least one workpiece two chip breaker elements which, viewed along a direction perpendicular to the cutting plane in a mounted state of the power tool cutting device, in a distance of less than 8 mm, preferably less than 5 mm and more preferably less than 3 mm are arranged relative to each other. In particular, the at least two chip breakage protection elements have a distance, viewed along a direction perpendicular to the cutting plane in a mounted state of the machine tool cutting device, that corresponds to a maximum dimension of the machine tool separating device, in particular of the cutting strand along the direction perpendicular to Cutting plane extending direction corresponds. By means of the embodiment of the portable power tool according to the invention, a clean cut edge can advantageously be achieved during machining of a workpiece by means of the power tool separating device operatively coupled to the portable power tool by the coupling device.

Furthermore, it is proposed that the portable power tool has a machine tool unit on which the chip removal protection unit is mounted. Particularly preferably, the machine tool unit is designed as a housing unit. Herbei preferably the drive unit and the gear unit are mounted in the housing unit. It is also conceivable that the machine tool unit is designed as a sliding shoe and / or as a tool support unit, etc. Particularly preferably, the chip breaker is relative to the housing unit linearly movable on and / or stored in the housing unit. It can be achieved structurally simple Spanausreißschutzeinheit.

Preferably, the chip breakage protection unit has at least one spring element which is provided to act on at least one guide element of the chip breakage protection unit at least in a direction away from the machine tool unit with a spring force. A "spring element" is to be understood in particular as a macroscopic element which has at least one extension that is elastically changeable by at least 10%, in particular by at least 20%, preferably by at least 30% and particularly advantageously by at least 50% in a normal operating state , and which in particular produces a counterforce which is dependent on a change in the extent and preferably proportional to the change and which counteracts the change. "Extension" of an element is understood to mean, in particular, a maximum distance between two points of a vertical projection of the element onto a plane , A "macroscopic element" is to be understood as meaning, in particular, an element having an extension of at least 1 mm, in particular of at least 5 mm and preferably of at least 10 mm By means of the configuration according to the invention, the chip breakage protection unit can advantageously be involved in machining a workpiece in the direction of the workpiece a spring force to be applied. It is also proposed that the machine tool unit has at least one guide recess, in which at least one guide element of the chip breaker unit is arranged movably relative to the machine tool unit in an assembled state. A "guide recess" is to be understood here as meaning, in particular, a recess which is intended to exert a constraining force on at least one direction on the guide element by means of edge regions which delimit the recess, in order to predetermine a possibility of movement of the guide element within the recess Spanausreißschutzeinheit along at least substantially parallel to a longitudinal axis of the guide unit extending

Directed linearly movable. The longitudinal axis of the guide unit preferably runs at least substantially parallel to the straight lines of the outer contour of the guide unit. It can structurally simple a movable storage of Spanausreißschutzeinheit be realized relative to the machine tool unit. Distance can advantageously be a direct contact of a portion of the

Spanausreißschutzeinheit be maintained in a machining of a workpiece, in particular in a non-uniform and / or an uneven course of a surface of the workpiece. Advantageously, the chip removal protection unit comprises at least one precutting device, which is intended to cut at least one surface of a workpiece to be machined. The surface of a workpiece to be machined is particularly preferably scribed by means of the precutting device in a region in which a cut is to be made by means of the machine tool parting device before a cut is made by means of the machine tool parting device into a workpiece to be machined. In particular, during machining of a workpiece, cutting edges, the distance of which along a direction extending at least substantially perpendicular to the cutting plane of the cutting strand specifies a maximum dimension of a cut which can be introduced by means of the machine tool cutting device, are scored by means of the precutting device. Preferably, the pre-cutting device comprises at least one pre-cutting element designed as a blade, which is arranged in a plane which extends at least substantially offset parallel to the cutting plane of the cutting strand. The precutting element is, viewed in front of the workpiece, along a direction extending from the coupling device in the direction of a handle and / or a grip region. arranged machine tool separating device. It can be advantageously prevented a tearing of chips in the region of cut edges.

In addition, the invention is based on a power tool separating device with at least one cutting strand and with at least one guide unit. It is proposed that the power-tool parting device comprises a chip break-out unit. Preferably, the Spanausreißschutzeinheit is attached to the guide unit. Particularly preferably, the chip breakage protection unit is connected to the guide unit at least in an operating state by means of a form-locking and / or a frictional connection. Particularly preferably, the chip breakage protection unit is releasably connected to the guide unit. Advantageously, precise cuts can be made by means of the machine tool separating device into a workpiece to be machined.

Furthermore, it is proposed that the chip breaker unit comprise at least one precutting unit which is provided to pre-cut at least one surface of a workpiece to be machined prior to machining the workpiece with the cutting strand. Particularly preferably, the surface of a workpiece to be machined by means of the pre-cutting in a region in which a cut is to be introduced by means of the machine tool cutting device, scribed before a cut is introduced by means of the machine tool cutting device in a workpiece to be machined. Preferably, the pre-cutting device comprises at least one pre-cutting element designed as a blade, which is arranged in a plane which extends at least substantially offset parallel to the cutting plane of the cutting strand. It may be advantageous to scrape cutting edges and to introduce cuts by means of the machine tool parting device during an operating state during a movement of the power tool parting device relative to a workpiece to be machined.

The machine tool separating device according to the invention and / or the portable power tool according to the invention should not be limited to the application and embodiment described above. In particular, the power-tool parting device according to the invention and / or the portable power-tool according to the invention can be used to fulfill one of them Functioning described have a number of individual elements, components and units differing from a number mentioned herein. In particular, with regard to alternative embodiments of the chip breaker protection unit, reference may be made in particular to the document EP 0 621 821 B1, whose contents, in particular with regard to alternative embodiments of the chip breaker unit, are to be regarded as part of the disclosure of the present document.

drawing

Further advantages emerge from the following description of the drawing. In the drawings, embodiments of the invention are shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Show it:

1 shows a portable power tool according to the invention with a machine tool separating device according to the invention in a schematic representation,

2 is a detailed view of a chip removal protection unit of the portable power tool according to the invention in a schematic representation,

3 shows a sectional view along the line III-III from FIG. 2 of the chip breaker unit in a schematic representation,

4 is a detailed view of the machine tool separating device according to the invention in a schematic representation,

5 is a sectional view along the line VV of Figure 4 of the machine tool separating device according to the invention in a schematic representation, 6 is a detail view of cutter support elements of a

Cutting strand of the machine tool separating device according to the invention in a schematic representation,

7 shows a further detailed view of one of the cutter carrier elements of the cutting strand of the machine tool cutting device according to the invention in a schematic representation,

8 shows a detailed view of an arrangement of the cutter carrier elements in a guide unit of the machine tool separating device according to the invention in a schematic representation, FIG. 9 shows an alternative portable machine tool according to the invention with an alternative chip breaker unit in a schematic representation,

10 is a detailed view of the alternative chip breaker in a schematic representation,

11 is a sectional view along the line Xl-Xl of Figure 10 of the alternative chip breaker in a schematic representation and

12 shows a detailed view of an alternative inventive machine tool separating device in a schematic representation.

Description of the embodiments

FIG. 1 shows a portable machine tool 10a with a machine tool separating device 18a, which together form a machine tool system. The portable power tool 10a has a coupling device 12a for the positive and / or non-positive coupling with the machine tool separating device 18a. In this case, the coupling device 12a can be embodied as a bayonet closure and / or as another coupling device that appears meaningful to a person skilled in the art. Further, the portable power tool 10a has a machine tool unit 22a formed as a housing unit, which encloses a motor unit 44a and a gear unit 46a of the portable power tool 10a. The motor unit 44a and the gear unit 46a are for generating one on the power tool separating device 18a transferable drive torque in a manner already known to a person skilled in the art operatively connected. In this case, the motor unit 44a and / or the gear unit 46a are provided to be coupled in a mounted state by means of the coupling device 12a to a cutting strand 14a of the power-tool parting device 18a. The gear unit 46a of the portable power tool 10a is formed as an angle gear. The motor unit 44a is designed as an electric motor unit. However, it is also conceivable for the motor unit 44a and / or the gear unit 46a to have another configuration that appears appropriate to a person skilled in the art. The motor unit 44a is provided for driving the cutting strand 14a of the power-tool parting device 18a in at least one operating state with a cutting speed of less than 6 m / s. In this case, the portable power tool 10a has at least one operating mode in which a drive of the cutting strand 14a in a guide unit 16a of the machine tool separating device 18a along a cutting direction 48a of the cutting strand 14a with a cutting speed of less than 6 m / s is made possible. Further, the portable power tool 10a comprises a support unit 50a for resting on a workpiece to be machined by the portable power tool 10a (not shown in detail here). The support unit 50a is designed as a sliding block and / or as a base plate, by means of which and / or which the portable power tool 10a slides and / or is supported on the workpiece during proper handling during machining of a workpiece.

Figure 2 shows an arrangement of a chip breaker unit 20a of the portable power tool 10a on the unit machine tool unit 22a of the portable power tool 10a. The chip breaker protection unit 20a is in this case mounted linearly movably on the machine tool unit 22a designed as a housing unit. The machine tool unit 22a embodied as a housing unit has two guide recesses 28a, 30a, in which two guide elements 32a, 34a of the chip breakaway protection unit 20a are movably mounted in an assembled state relative to the machine tool unit 22a designed as a housing unit. The guide recesses 28a, 30a extend in a coupled state of the power-tool parting device 18a with the coupling device 12a in two at least substantially parallel to a cutting plane of the Cutting strand 14a arranged levels. To secure the guide elements 32a, 34a from falling out of the guide recesses 28a, 30a, the guide elements 32a, 34a engage, for example by means of threaded bolts (not shown here), which engage in a slot (not shown in detail here) of the guide elements 32a, 34a , secured in the guide recesses 28a, 30a. However, it is also conceivable that the guide elements 32a, 34a are secured against falling out by means of other securing elements that appear appropriate to a person skilled in the art. The guide recesses 28a, 30a have a greater extension than the guide elements 32a, 34a along a longitudinal movement direction of the guide elements 32a, 34a, along which the guide elements 32a, 34a are arranged to be linearly movable in the guide recesses 28a, 30a.

Further, the chip breaker unit 20a includes two spring members 24a, 26a provided to apply a spring force to the chip breaking protection unit 20a in a direction away from the machine tool unit 22a formed as a housing unit. In each case one of the two spring elements 24a, 26a is arranged on one of the guide elements 32a, 34a. In this case, the guide elements 32a, 34a respectively extend through the spring element arranged on the respective guide element 32a, 34a

24a, 26a through. The spring elements 24a, 26a are designed as compression springs. However, it is also conceivable that the spring elements 24a, 26a have another, a skilled person appear appropriate design, such as a plate spring, as Evolutfeder etc. The spring elements 24a, 26a are each supported by one end 52a, 54a on an outer side designed as a housing unit machine tool unit 22a. With a further end 56a, 58a, the spring elements 24a, 26a are each supported on a shoulder 60a, 62a of the guide elements 32a, 34a. Further, the chip breaker unit 20a has two chip breakage protection members 64a, 66a formed integrally with the guide members 32a, 34a. The Spannausreißschutzelemente 64a, 66a are movably mounted by means of the guide elements 32a, 34a relative to the housing formed as a machine tool unit 22a. However, it is also conceivable that the chip breakage protection elements 64a, 66a are additionally mounted to be movable relative to one another. The chip breaker protection elements 64a, 66a are each in one coupled state of the power-tool parting device 18a with the coupling device 12a on one of two outer walls 68a, 70a of the guide unit 16a. Thus, the power-tool parting device 18a is arranged in a coupled state with the coupling device 12a in a partial region, viewed along a direction at least substantially perpendicular to the cutting plane of the cutting strand 14a, between the chip break-out protection elements 64a, 66a. When machining a workpiece (not shown here in detail) by means of the power-tool parting device 18a, the chip break-out protection elements 64a, 66a can slide on the outer walls 68a, 70a along the longitudinal movement direction of the guide elements 32a, 34a. The chip breaker elements 64a, 66a are pressed onto a surface of the workpiece during machining of a workpiece in order to avoid chipping of chips in the region of cut edges of a section which can be introduced by means of the cutting strand 14a due to the spring force of the spring elements 24a, 26a. In this case, the chip breakage protection elements 64a, 66a rest flush against outer edges of cutting elements 72a, 74a of the cutting strand 14a in a partial area of the power-tool parting device 18a (FIG. 3). In addition, it is also conceivable that the chip breakage protection elements 64a, 66a each have an adjustable partial area which, as a function of a total width of the machine tool separating device 18a, viewed along a direction perpendicular to the flat plane, can be adjusted by means of a setting unit. Thus, the chip breaker protection elements 64a, 66a can each be adapted to a machine tool separating device coupled to the coupling device 12a. It is also conceivable that the chip breakage protection elements 64a, 66a each have a replaceable partial area which, as a result of an exchange with another partial area, can be adapted to a total width of a machine tool separating device coupled to the coupling device 12a.

FIG. 4 shows the power-tool parting device 18a in a state decoupled from the coupling device 12a of the portable power tool 10a. The machine tool separating device 18a has the cutting strand 14a and the guide unit 16a, which together form a closed system. The guide unit 16a is designed as a sword. Furthermore, the guide unit 16a, viewed in the cutting plane of the cutting strand 14a, at least two convexly shaped ends 76a, 78a. The convex The ends 76a, 78a of the guide unit 16a are arranged on two opposite sides of the guide unit 16a. The cutting strand 14a is guided by the guide unit 16a. For this purpose, the guide unit 16a at least one guide element 80a (Figure 8), by means of which the cutting strand 14a is guided. The guide member 80a is here formed as a guide groove 82a, which extends in the cutting plane of the cutting strand 14a along an entire circumference of the guide unit 16a. Here, the cutting strand 14a is guided by means of the guide groove 82a bounding edge regions of the guide unit 16a. However, it is also conceivable that the guide element 80a is formed in another manner that appears appropriate to a person skilled in the art, such as, for example, as rib-like molding on the guide unit 16a, which engages in a recess on the cutting strand 14a. The cutting strand 14a, viewed in a plane perpendicular to the cutting plane, is surrounded on three sides by the edge regions delimiting the guide groove 78a (FIG. 8). The cutting strand 14a is during a

Operation circumferentially in the guide groove 82 a relative to the guide unit 16 a moves.

Furthermore, the power-tool parting device 18a has a torque transmission element 42a, which is at least partially supported by means of the guide unit 16a, for driving the cutting strand 14a. In this case, the torque transmission element 42a has a coupling recess 84a, which in a mounted state can be coupled to the motor unit 44a and / or the gear unit 46a. The coupling recess 84a is arranged concentrically in the torque transmission element 42a. The coupling recess 84a is formed as a hexagon socket. However, it is also conceivable for the coupling recess 84a to have another configuration that appears appropriate to a person skilled in the art. In an uncoupled state of the torque transmitting member 42a with the motor unit 44a and / or the gear unit 46a, the torque transmitting member 42a is transverse to the cutting direction 48a of FIG

Cutting strand 14a and / or arranged along the cutting direction 48a in the guide unit 16a movable (Figure 5). Here, the torque transmission element 42a is at least partially disposed between the two outer walls 68a, 70a of the guide unit 16a. The outer walls 68a, 70a extend at least substantially parallel to the cutting plane of the cutting strand 14a.

The guide unit 16a has in outer surfaces 86a, 88a of the outer walls 68a, 70a each have a recess 90a, 92a, in which the torque transmission element 42a is at least partially arranged.

The torque transmission element 42a is arranged with a partial region in the recesses 90a, 92a of the outer walls 68a, 70a. In this case, the torque transmission element 42a has, at least in the partial region arranged in the recesses 90a, 92a, an extension along an axis of rotation 94a of the torque transmission element 42a, which terminates flush with one of the outer surfaces 86a, 88a of the guide unit 16a. Further, in the recesses 90a, 92a of the outer surfaces 86a, 88a of the guide unit

16a disposed portion of the torque transmitting element 42a an at least substantially perpendicular to the rotation axis 94a of the torque transmitting element 42a extending outer dimension, which is at least 0.1 mm smaller than at least substantially perpendicular to the rotation axis 94a of the torque transmitting element 42a extending inner dimension of the recesses 90a, 92a , The arranged in the recesses 90a, 92a portion of the torque transmitting element 42a is arranged along a direction perpendicular to the axis of rotation 94a extending direction each spaced from a respective recess 90a, 92a limiting edge of the outer walls 68a, 70a. Thus, in the recesses

90a, 92a arranged portion of the torque transmitting element 42a a game within the recesses 90a, 92a.

FIG. 6 shows a detailed view of cutter carrier elements 96a, 98a of the cutting strand 14a of the power tool separating device 18a. The cutting strand 14a comprises a plurality of interconnected cutter support elements 96a, 98a, each interconnected by a connecting element 100a, 102a of the cutting strand 14a, which is at least substantially flush with one of two outer surfaces 104a, 106a of one of the interconnected cutter support elements 96a, 98a (see also Figure 8).

The connecting elements 100a, 102a are bolt-shaped. The outer surfaces 104a, 106a extend in a state arranged in the guide groove 82a of the cutting strand 14a at least substantially parallel to the cutting plane of the cutting strand 14a. A person skilled in the art will, depending on the application, have a suitable number of cutter carrier elements 96a for the cutting strand 14a.

Select 98a. The cutter support elements 96a, 98a are each in one piece formed with one of the connecting elements 100a, 102a. Furthermore, the cutter support elements 96a, 98a each have a connecting recess 108a, 110a for receiving one of the connecting elements 100a, 102a of the interconnected cutter support elements 96a, 98a. The connecting elements 100a, 102a are guided by means of the guide unit 16a (FIG. 8). Here, the connecting elements 100a, 102a are arranged in the assembled state of the cutting strand 16a in the guide groove 82a. The connecting elements 100a, 102a may, viewed in a plane perpendicular to the cutting plane, be supported on two side walls 112a, 114a of the guide groove 82a. The side walls 112a, 114a define the guide groove 82a along a direction perpendicular to the cutting plane. Furthermore, the side walls 112a, 114a of the guide groove 82a, viewed in the cutting plane, extend outward from the guide unit 16a perpendicular to the cutting direction 48a of the cutting strand 14a.

The cutter support elements 96a, 98a of the cutting strand 14a each have a recess 116a, 118a, which is in each case arranged in an assembled state on a torque transmission element 42a facing side 120a, 122a of the respective cutter support member 96a, 98a. The torque transmission element 42a engages in at least one operating state

Drive the cutting strand 14a into the recesses 116a, 118a. The torque transmission element 42a is formed here as a gear. Thus, the torque transmitting element 42a includes teeth 124a, 126a provided for, in at least one operating state, for driving the cutting strand 14a into the recesses 116a, 118a of the cutter support elements

96a, 98a intervene. Further, the torque transmitting member 42a facing sides 120a, 22a of the cutter support members 96a, 98a are formed in a circular arc. The sides 120a, 122a of the cutter carrier elements 96a, 98a facing the torque transmission element 42a in an assembled state are each in partial regions 128a, 130a, 132a, 134a between a central axis 136a of the respective connecting element 100a, 102a and a central axis 138a, 140a of the respective one Connection recess 108a, 110a viewed, circular arc designed. The arcuate portions 128a, 130a, 132a, 134a are respectively formed adjacent to the recesses 116a, 118a into which the torque transmitting member 42a engages. In this case, the circular-arc-shaped partial areas 28a, 130a, 132a, 134a a radius corresponding to a radius of a course of the guide groove 82a at the convex ends 76a, 78a. The partial regions 128a, 130a, 132a, 134a are concave (FIG. 7).

Furthermore, the cutting strand 14a has the cutting elements 72a, 74a. The cutting elements 72a, 74a are each formed integrally with one of the cutter support elements 96a, 98a. A number of the cutting elements 72a, 74a are dependent on a number of cutter support elements 96a, 98a. A person skilled in the art will select a suitable number of cutting elements 72a, 74a depending on the number of cutter carrier elements 96a, 98a. The cutting elements 72a, 74a are provided to allow a separation and / or removal of material particles of a workpiece to be machined (not shown here). The cutting elements 72a, 74a can be designed, for example, as a full chisel, semi-chisel or other types of cutting edge that appear meaningful to a person skilled in the art, which are intended to enable a separation and / or removal of material particles of a workpiece to be machined. The cutting strand 14a is endless. Thus, the cutting strand 14a is formed as a cutting chain. The blade carrier elements 96a, 98a are in this case designed as chain links, which are connected to one another by means of the bolt-shaped connecting elements 100a, 102a. However, it is also conceivable that the cutting strand 14a, the cutter support elements 96a, 98a and / or the connecting elements 100a, 102a are configured in another manner that appears appropriate to a person skilled in the art.

FIGS. 9 to 12 show two alternative embodiments. Substantially identical components, features and functions are basically numbered by the same reference numerals. To distinguish the embodiments, the letters a to c are added to the reference numerals of the embodiments. The following description is essentially limited to the differences from the first exemplary embodiment in FIGS. 1 to 8, wherein reference can be made to the description of the first exemplary embodiment in FIGS. 1 to 8 with regard to components, features and functions that remain the same.

FIG. 9 shows an alternative portable power tool 10b with a machine tool separating device 18b, which together form a machine tool Form system. The portable power tool 10b and the power tool cutting device 18b each have a portable power tool 10a described in FIGS. 1 to 8 and a structure similar to the described power tool separating device 14a. Thus, the portable power tool 10b has a coupling device 12b which can be coupled to the machine tool separating device 18b formed by a cutting strand 14b and a guide unit 16b. In addition, the portable power tool 10b includes a chip breaker unit 20b. The chip breaker protection unit 20b is in this case mounted on a housing unit designed as a machine tool unit 22b of the portable power tool 10b linearly movable. The machine tool unit 22b designed as a housing unit has two guide recesses 28b, 30b in which two guide elements 32b, 34b of the chip breaker unit 20b are movably mounted in an assembled state relative to the machine tool unit 22b designed as a housing unit (FIG. 10). Further, the chip breaker unit 20b includes two spring members 24b, 26b which are provided to apply a spring force to the chip breaking protection unit 20b in a direction away from the machine tool unit 22b configured as a housing unit. The spring elements 24b, 26b are arranged in the guide recesses 28b, 30b. Thus, the spring elements 24b, 26b are each supported by one end 52b, 54b of the spring elements 24b, 26b on an edge region of the machine tool unit 22b designed as a housing unit that delimits the respective guide recess 28b, 30b. With a further end 56b, 58b of the spring elements 24b, 26b, the spring elements 24b, 26b are each supported on a side of the respective guide element 32b, 34b facing the respective spring element 24b, 26b.

Furthermore, the chip removal protection unit 20b comprises a precutting device 36b, which is provided to cut at least one surface of a workpiece to be machined (not shown here in detail). The precutting device 36b has two precutting elements 38b, 40b designed as blades, which are each arranged in a plane which extends at least substantially parallel to the cutting plane of the cutting strand 14b. When machining a workpiece, a surface of a workpiece to be machined is scratched by means of the rough cutting elements 38b, 40b in a region in which a cut can be made by means of the cutting strand 14b a cut is made by means of the cutting strand 14b in a workpiece to be machined. Here, cutting edges whose distance along a direction extending at least substantially perpendicular to the cutting plane of the cutting strand 14b direction a maximum dimension of one by means of

Cutting strand 14b provides inculpable cut, scored by the Vorschneidelementen 38b, 40b in a surface of a workpiece to be machined. The pre-cutting elements 38b, 40b are viewed in a coupled state of the power-tool parting device 18b with the machine along a direction extending from the coupling device 12b in the direction of a handle and / or a grip region of the portable power tool 10b

Coupling device 12b arranged in front of the cutting strand 14b (Figure 11).

FIG. 12 shows an alternative power-tool parting device 18c, which has a cutting strand 14c and a guide unit 16c for guiding the cutting strand 14c. With regard to a construction of the power-tool separating device 18c with respect to an embodiment of the cutting strand 14c, the guide unit 16c and a torque-transmitting element 42c of the machine-tool separating device 18c for driving the cutting strand 14c supported in the guide unit 16c, the embodiment shown in FIGS be referred to the described construction. The power-tool parting device 18c comprises a chip break-out protection unit 20c, which is fastened to the guide unit 16c in a form-fitting and / or force-locking manner. However, it is also conceivable that the chip breaker protection unit 20c is integrally connected to outer walls 68c, 70c of the guide unit 16c.

The chip removal protection unit 20c comprises two chip breakage protection elements 64c, 66c, which are movably mounted relative to the guide unit 16c. In addition, the chip breakage protection elements 64c, 66c are movably mounted relative to one another. The chip breakage protection elements 64c, 66c respectively abut against one of two outer walls 68c, 70c of the guide unit 16c. Thus, the guide unit 16c in a partial area, viewed along a direction at least substantially perpendicular to the cutting plane of the cutting strand 14c direction, between the chip breaker protection elements 64c, 66c arranged. Furthermore, the chip breaker unit 20c has two spring elements 24c, 26c, which are provided for guiding the chip breakage protection elements 64c, 66c in a direction running in a cutting plane of the cutting strand 14c with a spring. to apply force. When machining a workpiece (not shown here in detail) by means of the power-tool parting device 18c, the chip break-out protection elements 64c, 66c can slide on the outer walls 68c, 70c. The chip breaker elements 64c, 66c are pressed onto a surface of the workpiece during machining of a workpiece in order to avoid chipping of chips in the area of cut edges of a section which can be introduced by means of the cutting strand 14c due to the spring force of the spring elements 24c, 26c. In this case, the chip breakage protection elements 64c, 66c rest flush against outer edges of cutting elements 72c, 74c of the cutting strand 14c in a partial region of the power-tool parting device 18c.

In addition, the chip breaker unit 20c has a precutting device 36c, which is provided to cut at least one surface of a workpiece to be machined (not shown here in detail). The precutting device 36c has two precutting elements 38c, 40c designed as blades, which are each arranged in a plane which extends at least substantially parallel to the cutting plane of the cutting strand 14c. When machining a workpiece, a surface of a workpiece to be machined is scored by means of the rough cutting elements 38c, 40c in an area in which a cut is insertable by means of the cutting strand 14c, before a cut is made by the cutting strand 4c in a workpiece to be machined. In this case, cutting edges whose distance along a direction extending at least substantially perpendicular to the cutting plane of the cutting strand 14c specifies a maximum dimension of a cut which can be introduced by means of the cutting strand 14c are incised by means of the precutting elements 38c, 40c in a surface of a workpiece to be machined.

Claims

claims

Portable machine tool having at least one coupling device (12a, 12b) which can be coupled to a machine tool separating device formed from at least one cutting strand (14a, 14b) and at least one guide unit (16a, 16b),

characterized by at least one chip removal protection unit (20a; 20b).

2. Portable machine tool according to claim 1,

characterized by a machine tool unit (22a; 22b) on which the chip breakage protection unit (20a; 20b) is mounted.

3. Portable machine tool according to claim 2,

characterized in that the Spanausreißschutzeinheit (20a, 20b) at least one spring element (24a, 26a, 24b, 26b), which is provided, at least one guide element (32a, 34a, 32b, 34b) of the chip breaker protection unit (20a, 20b) at least To act in a direction away from the machine tool unit (22a; 22b) direction with a spring force.

4. Portable machine tool at least according to claim 2,

characterized in that the machine tool unit (22a; 22b) has at least one guide recess (28a, 30a; 28b, 30b) in which at least one guide element (32a, 34a; 32b, 34b) of the chip breaker unit (20a; 20b) in an assembled state movably relative to the machine tool unit (22a; 22b).

Portable machine tool according to one of the preceding claims, characterized in that the chip breakage protection unit (20b) comprises at least one precutting device (36b) which is provided to pre-cut at least one surface of a workpiece to be machined. Machine tool separating device with at least one cutting strand (14c) and with at least one guide unit (16c),

characterized by a chip breakage protection unit (20c).

Machine tool separating device according to claim 6,

characterized in that the chip breakage protection unit (20c) on the

Guide unit (16c) is attached.

Machine tool separating device at least according to claim 6,

characterized in that the chip breaker unit (20c) comprises at least one precut device (36c) having at least one precut element (38c, 40c) arranged in a plane at least substantially parallel to a cutting plane of the cutting strand (14c) ,

Machine tool separating device at least according to claim 6,

characterized by at least one torque transmission element (42c) for driving the cutting strand (14c), which is at least partially mounted in the guide unit (16c).

Machine tool system with at least one portable power tool according to one of claims 1 to 5 and with at least one machine tool separating device comprising at least one cutting strand (14a; 14b) and at least one guide unit (16a; 16b).