GB2506016A

GB2506016A - A fixed angle portable machine tool

Info

Publication number: GB2506016A
Application number: GB201315476A
Authority: GB
Inventors: Uwe Engelfried; Petr Grulich; Thomas Duerr
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2012-08-31
Filing date: 2013-08-29
Publication date: 2014-03-19
Also published as: DE102012215450A1; CN103659745A; GB201315476D0

Abstract

The invention details a portable hand-held machine tool comprising at least one drive unit 12a, which has a drive unit longitudinal axis 14a, and at least one operating support unit 16a, which has at least one support surface 18a. It is proposed that the drive unit longitudinal axis 14a and the support surface 18a include a fixed angle 20a of between 0Â° and 90Â°. Preferably the angle 34a is between 90Ëš and 180Ëš. Preferably a parting device 24a is included comprising a cutting train 26a, which may be a cutting chain, and a guide unit 28a. Another embodiment (figure 2) may include a pistol grip handle (52b, figure 2).

Description

Portable machine tool

Background art

Portable machine tools are known, comprising a drive unit, which has.a drive unit longitudinal axis, as well as an operating support unit, which has a support surface.

Disclosure of the invention

The invention proceeds from a portable machine tool having at least one drive unit, which has a driv unit longitudinal axis, and having at least one operating support unit, which has at least one support surface.

It is proposed that the drive unit longitudinal axis and the support surface include a fixed angle having an angular dimension of between 00 and 900. Here, by a "portable machine tool" is meant in particular a machine tool, in particular a hand-held machine tool, which may be transported by an operator without a transport machine.

The portable machine tool has in particular a weight that is less than 40 kg, preferably less than 10 kg and-particularly preferably less than 5 kg. The portable machine tool in this case may take the form of a corded or cordless portable machine tool. The term "drive unit" here t is to define in particular a unit that is provided for generating forces and/or torques for driving the cutting train. In a preferred manner, fo generating forces and/or torques by means of the motor unit thermal energy, chemical energy and/or electrical energy is converted to kinetic energy. In particular the drive unit i configured to be capable of coupling directly and/or indirectly to the cutting train. In a particularly preferred manner the drive unit comprises at least one stator and at least one rotor, which has at least one armature shaft. The drive unit is therefore configured in particular as an electric motor unit.

Here, by a "drive unit longitudinal axis" is meant in particular an axis of the drive utlit that extends at least substantially coaxially with an axis of rotation of a drive shaft of the drive unit, in partIcular an armatué shaft of the drive unit. In particular the drive unit has a maximum dimension along the drive unit longitudinal axis. The drive unit longitudinal axis is formed preferably by an axis of rotation of the armature shaft of the drive unit.

Here, by an "operating suppo±t unit" is meant in particular a unit which during machining of a workpiece by means of the machine tool, given correct handling of the machine tool, rests in particular with the support surface of the operating support unit on the worlcpiece and which is provided for supporting the machine tool on the workpiece during machining of the workpiece. In a particularly preferred manner the operating support unit is configured as a sliding pad and/or as a base plate. The machine tool during machining of the workpiece preferably slides by means of the operating support unit, in particular the -support surface of the operating support unit, along a t surface of the workpiece to be machined. Here, by the expression "a fixed angle having an angular dimension of between 0° and 90°" is meant in particular a fixed angle between two axes that is non-adjustable and has an angular dimension greater than 00 and smaller than 90°. In an advantageous manner by means of the development according to the invention of the portable machine tool a distance between the support surface of the operating support unit and a coupling device of the portable machine tool and/or an insert tool clamping point may be kept low in order to keep an unused length of an insert tool advaritageous.y small.

It is further proposed that the portable machine tool has at least one machine tool housing, in which the drive unit is disposed, wherein the angle extends from the support *surface in the direction of the madhine tool housing. A large free space may therefore be advantageously created between the operating support unit and the machine tool housing, thereby making it possible to grasp the handle area of the machine tool housing particularly comfortably.

Thus, a high degree of operating comfort may advantageously be achieved.

The invention further proceeds from a machine tool system having at least one portable machine tool according to the invention and having at least one machine tool parting device, which comprises at least one cutting train and at least one guide unit. Here, by a "cutting train" is meant in particular a unit that is provided for locally undoing ah atomic coherence of a workpiece to be machined, in particular by means of mechanically severing and/or by means of mechanically removing workpiece particles from the workpiece. In a preferred manner the cutting train is provided for dividing the wor]cpiece into at least two parts that are physically separate from one another and/or for at least partially detaching and/or rethbving workpiece particles of the workpiece from a surface of the workpiece.

In a particularly advantageous manner cut slits of small dimensions may be produced by the cutting train, viewed along the direction extending at least substantially at right angles to the cutting plane of the cutting train, having a maximum dimension of between 1.3 mm and 2.2 nun.

In a particularly preferred manner the cutting train in at least one operating state executes a rotational movement, in particular along a circumference of the guide unit.

Here, by a "guide unit" iê meant in particular a unit that is provided for exerting a positive force on the cutting train at least along a direction at right angles to a cutting direction of the cutting train in order to define a scope of movement of the cutting train along the cutting direction. In this connection, by "provided" is meant in particular specially designed and/or specially equipped.

In a preferred manner the guide unit comprises at least one guide element, in particular a guide slot, through which the cutting train is conveyed. In a preferred manner the cutting train, viewed in a cutting plane, is conveyed along an entire circumference of the guide unit through the guide unit by means of the guide element, in particular the guide slot. Preferably the guide unit together with the mounted cutting train, viewed along a direction extending at least substantially parallel to the cutting plane of the cutting train and at least substantially at right angles toa main extent direction of the guide unit, has a maximum dimension of less than 50 mm. -5

Here, the term "cutting plane" is to define in particular a plane, in which the cutting train in at least one operating state is moved along a circumference of the guide unit in at least two mutually opposite cutting directions re.ative to the guide unit. In a preferred manner the cutting plane during machining of a workpiece is aligned at least substantially transversely of a workpiece surface that is to be machined. Here, by "at least substantially transversely" is meant in particular an alignment of a plane and/or a direction relative to a further plane and/or a further direction that preferably differs from a parallel alignment of the plane and/or the direction relative to the further plane and/or the further direction. It is however also conceivable that the cutting plane during machining of a workpiece is aligned at least substantially parallel to a workpiece surface that is to be machined, in particular given a configuration of the cutting tain as a grinding -means etc. Here, by "at least substantially parallel" is meant in particular an alignment of a direction relative to a reference direction, in particular in a plane, wherein the direction in relation to the reference direction has a deviation of in particular less than 8°, advantageously less than 5° and particularly advantageously less than 2°.

Here, by a "cutting direction" is meant in particular a direction, along which the cutting train, in order to produce a cut slit and/or to detach and/or remove workpiece particles of a workpiece to be machined, in at least one operating state is moved as a result of a driving force.

and/or a driving torque, in particular in the guide unit.

In a preferred manner the cutting train in one operating state is moved along the cutting direction relative to the guide unit. . . Preferably the guide unit and the cutting train together form a closed system. Here, theterm "closed system" is to define in particular a system, which comprises at least two components that by means of an interaction in a state of disassembly of the system from a system that is of a higher level to the system, such as for example a machine tool, retain a functionality aid/or which in the state of disassembly are captively connected to one another. In a preferred manner, for an operator the at least two components of the closed system are at least substantially non-detachably connected to one another. Here, by "at least substantially non-detachably" is meant in particular a connection of at least two structural parts, which are separable from one another only with the aid of parting tools, such as for example a saw, in particular a mechanical saw etc., and/or chemical parting agents, such as for example solvents etc. By means ofthe development according to the invention of the machine tool system a user-friendly machine tool system may be advantageously achieved, which enables a comfortable machining of It is moreover proposed that the portable machine tool comprises at least one coupling device for coupling the machine tool parting device and the guide unit has a longitudinal axis, which with the drive unit longitudinal axis of the drive unit includes a further angle having an angular dimension of between 90° and 160°. Here, by a "coupling device" is meant in particular a device that is provided for workingly connecting the machine tool parting device by means of a positive and/or no-n-positive connection to the portable machine tool for machining a workpiece. In particular, in a coupled state of the coupling device to the machine ool parting device, in one operating state of the portable machine tool force and/or torques nay be transmitted from the drive unit bf the portable machine tool to the drive unit parting device in order to drive the cutting train The coupling device is therefore preferably oonfigured as a tool holder. Here, the term "longitudinal axis" is to define in particular an axis, along which a structural part, in particular the guide unit, has a maximum dimension. By means of the development according to the invention a particularly small unused length of the machine tool parting device may be advantageously achieved in a state, in which the machine tool parting device is disposed on the coupling device.

It is further proposed that the further angle between the drive unit longitudinal axis and the longitudinal axis of the guide unit has an angular dimension that is greater than 90. It is therefore advantageously possible to create a large free space between the support unit and the machine tool housing for a hand or for fingers of a hand of an operator in order to enable comfortable grasping *of a handle region of the machine tool housing.

It is further proposed that the further angle between the drive unit longitudinal axis and the longitudinal axis of the guide unit has an angular dimension that is less than 1800. In a particularly advantageous manner it is possible to create a facility, whereby a hand or fingers of a hand of an operator may easily reach through between support unit and the machine tool housing, wherein the portable machine tool has compact dimensions.

The machine tool according to the invention and/or the machine tool system according to the invention should not be limited hereby to the application and form of construction described above. In particular the machine tool according to the invention and/or the machine tool system according to the invention in orde to fulfil a mode of operation described herein may comprise a number of individual elements, components and units that differs from a number described herein.

Drawings Further advantages emerge from the following description of drawings. In the drawings embodiments of the inventiOn are represented. The drawings, 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.

The drawings show: Fig. 1 a diagrammatic representation of a machine tool systemaccording to the invention, comprising a portable machine tool according to the invention and a machine tool parting device according to the invention, and Fig. 2 a diagrammatic representation of an alternative machine tool system according to the invention, comprising a portable machine tool according to the invention and a machine tool parting device according to the invention.

Description of the embodiments

Figure 1 shows a machine tool system 36a having a portable machine tool ba and having a machine tool parting device 24a, which comprises at least one cuttIng train 26a and at least one guide unit 28a. The portable machine tool LOa comprises at least one drive unit 12a, which.has a drive unit longitudinal axis 14a, and at least one operatinq support unit 16a, which has at least one support surface lBa. The drive unit longitudinal axis 14a and the support surface 18a in this case include a fixed angle 20a having an angular dimension of between 0° and 90°. In the present case, the drive unit longitudinal axis 14a and the support surface iSa include a fixed angle 20a having an angular dimension of between 10° and 45°. The portable machine tool ba further comprises at least one machine tool housing 22a, in which the drive unit l2a is disposed, whereiz the angle 20a extends from the support surface iSa in the direction of the machine tool housing 22a. The machine tool housing 22a surrounds the drive unit 12a and a gear unit 38a of the portable machine tool lOa and supports bearing forces of the drive unit 12a and the gear unit 38a.

In the present case the machine tool housing 22a has a rod--shaped configuration. A sub-region of the machine tool housing 22a therefore forms a handle region 42a of the portable machine tool ba. An operator control element 50a of an operator control unit 48a of the portable machine tool bOa for start-up and/or interruption of a power supply of the drive unit l2ais disposed on the machine too: housing 22a in the handle region 42a. The handle reion 42a is of a cylindrical configuration. The drive unit 12a is moreover surrounded by the handle region 42a. The drive unit l2a is therefore disposed inside the maohine tool housing 22a in the area of the handle region 42a. The drive unit l2a and the gear unit 30a are workingly connected to one another in a manner already known to a person skilled in the art in order to generate a driving. . -torque that may be transmitted tb the machine tool parting device 24a. The gear unit 38a takes the form of a right-angle gear. The drive unit l2a *takes the form of an electric motor unit. The drive unit longitudinal axis l4a of the drive unit l2a therefore takes the form of the axis of rotation of an armature shaft 40a of the drive unit 12a.

It is however also conceivable for the drive unit 12a and/or the geat unit 38a to have a different configuration deemed meaningful by a person skilled in the art. The drive unit l2a is provided for driving the cutting train 26a of the machine tool parting device 24a in at least one state via the gear unit 38a.

The portable machine tool lOa further comprises at least one coupling device 30a for coupling the machine tool parting device 24a. The coupling device 30a is provided for coupling the machine tool parting device 24a positively and/or nonTpositively to the portable machine tool ba.

The coupling device -30a in this case may take the form of a bayonet catch and/or any other coupling device deemed meaningful by a person skilled in the art. The guide unit 28a moreover has a longitudinal axis 32a, which in a state, in which the machine tool partifig device 24a is disposed on the coupling device 30a, with the drive unit longitudThal axis 14a of the drive unit 12a includes a further angle 34a having an angular dimension of between 90°. and 180°. In the present case the further angle 34a between the drive unit longitudinal axis 14a and the longitudinal axis 32a of the guide unit 28a has an angular dimension that is greater than 90°. The further angle 34a between the drive unit longitudinal axis 14a and the longitudinal axis 32a of the guide unit 28a moreover has an angular dimension that is less than 180°.

tn a state, in which the machine tool parting device 24a is disposed on the coupling device 30a, the drive unit longitudinal axis 14a of the drive unit 12a and the longitudinal axis 32 of the guide unit 28a are disposedn a common plane. The common plane in this case extends at least substantially at right angles to the support surface iSa of the operating support unit 16a. In an embodiment of the portable machine tool l0a that is not represented in detail here, the drive unit longitudinal axis 14a of the drive unit l2a is disposed in a plane extending at least substantially at right angles to the support surface l8a of the operating support unit l6a and in a state, in which the machine tool parting device 24a is disposed on the coupling device 30a, the longitudinal axis 32a of the guide unit 28a is disposedin a further plane extending at least substantially at right angles to the support surface l8a of the operating support unit 16a, wherein the plane and the further plane run at least substantially parallel. In the present case, the machine tool parting device 24a at a side of the operating support unit l6a remote from the machine tool housing 22a projects beyond the support surface.l8a * for machining workpieces by means of the cutting train 26a.

Thus, in a state, in which the machine tool parting device 24a is disposed on the coupling device 30a, the guide unit 28a, viewed along the longitudinal axis 32a of the guide unit 2&a, extends beyond the support surface 18a for machining workpieces by means of the cutting train 26a.

The longitudinal axis 32a of the guide unit 28a in this case extends at least substantially at right angles to the support surface iSa of the operating support unit 16a.

The cutting train 26a and the guide unit 28a of the machine tool parting device 24a together form a closed system. The cutEing train 26a is guided by means of the guide unit 28a.

For this purpose the guide unit 28a has at least one guide slot (not represented in detail here) . The cutting train 26a is guided by means of marginal regions of the guide unit 28a that delimit the guide slot. It is however also conceivable for the guide unit 28a to have a different element for guiding the cutting train 26a that is deemed mèainingful by the etson skilled in the art, such as for example an element in the form of a rib-like moulding on the guide unit 28a, which engages into a recess in the cutting train 26a. The cutting train 26a while in operation is moved rotationally along a circumference of the guide unit 28a in the guide slot. The cutting train 26a takes the form of a cutting chain. For this purpose the cutting *train 26a comprises a plurality of mutually connected cutting train segments 44a, 46a.

In a state, in which the machine tool parting device 24a is disposed on the coupling device 30a, an output element in the form of a gear wheel (not represented in detail here) of. the gear unit 38a engages into the guide unit 28a. In this case the output element for driving the cutting train 26a is temporarily in mesh with the cutting train segments 44a, 46a of the cutting train 26a. The output element is fastened in a rotationafly locked manner by means of a positive and/or non-positive connection on an output shaft of the gear unit 38a. It is however also conceivable for the output element to be formed integrally with the output shaft.

In Figure 2 an alternative embodiment is represented.

Substantially unaltered components, features and functions are in principle denoted by the same reference characters.

In order to differentiate between the embodiments the letters a and b have been added to the reference dharacters of the embodiments. The following description is confined substantially to the differences from the first embodiment described in Figure 1, wherein with regard to unaltered components, features and functions reference may be made to the description of the first embodiment in Figure 1.

Figure 2 shows a machine tool system 3'6b having a portable machine tool lOb and having a machine tool parting device 24b, which comprises at least one cutting train 26b and at least one guide unit 2b. The portable machine tool lOb comprises at least one drive unit l2b, which has a drive unit longitudinal axis 1.4b, and at least one operating support unit 16b, which has at least one support surface lBb. The drive unit longitudinal axis l4b and the support surface lSb in this case include a fixed angle 20b having an angular dimension of between 0° and 90°. In the present case the drive unit longitudinal axis 14b and the support surface l8b include a fixed angle 20b having an angular dimension of between 40° and 75°. *The portable machine tool lOb further comprises at least one machine tool housing 22b, in which the drive unit 12b is disposed, wherein the angle 2Gb extends from the support surface lSb in the direction of the machine tool housing 22b. The portable machine tool lOb moreover comprises a handle 52b.

The handle 52b extends at least substantially transversely of the drive unit longitudinal axis 14b of the drive unit l2b. The handle 52b is moreover moulded integrally onto the machine tool housing 22b. The handle 52b forms a so-called pistol grip of the portable machine tool lob.

Disposed on the handle 52b is an operator control element 50b of an operator control unit 48b of the portable machine tool lOb for start-up and/or interruption of a pbwer supply of the drive unit l2b. With regard to further features of the machine tool system 36b of Figure 2 reference may be made to the description of the machine tool system 36a of Figure 1.