Abstract:
A device for limiting the depth of a cut, which is to be used in portable machine tools, includes at least one cut-depth guide unit, and at least one stop unit that has at least one stop element. The stop element has, for the purpose of limiting the depth of a cut, a movement potential relative to the cut-depth guide unit along a cut-depth guide track of the cut-depth guide unit. The cut-depth limiting device further includes at least one stop movement unit which is configured to allow the stop element a further movement potential relative to the cut-depth guide unit, at least one of along and about an axis of movement, at least when in a state of operation.

Description:
This application is a 35 U.S.C. §371 National Stage Application of PCT/EP2012/068477, filed on Sep. 20, 2012, which claims the benefit of priority to Serial No. DE 10 2011 086 337.0, filed on Nov. 15, 2011 in Germany, the disclosures of which are incorporated herein by reference in their entirety. 
     BACKGROUND 
     There are already known cut-depth limiting devices for portable power tools, which comprise a cut-depth guide unit and a stop unit, the latter having a stop element that, for the purpose of limiting a depth of cut, has a capability to move relative to the cut-depth guide unit along a cut-depth guide path of the cut-depth guide unit. 
     SUMMARY 
     The disclosure is based on a cut-depth limiting device for portable power tools, comprising at least one cut-depth guide unit, and comprising at least one stop unit, which has at least one stop element that, for the purpose of limiting a depth of cut, has a capability to move relative to the cut-depth guide unit along a cut-depth guide path of the cut-depth guide unit. 
     It is proposed that the cut-depth limiting device have at least one stop movement unit, which is provided to allow a further capability of the stop element to move relative to the cut-depth guide unit along and/or about a movement axis, at least when in an operating state. The expression “cut-depth limiting device” is intended here to define, in particular, a device provided to limit a distance to which a working tool, in particular a circular-saw blade connected to a tool receiver of a portable power tool is inserted into a workpiece on which work is to be performed, and/or to set a length of the insertion distance, in particular by means of the stop unit. “Provided” is to be understood to mean, in particular, specially designed and/or specially equipped. In this case, the depth to which the working tool is inserted in a workpiece on which work is to be performed is, in particular, that viewed along a direction running substantially perpendicularly in relation to a seating surface of a seating unit of the portable power tool, by which the portable power tool is seated on a workpiece surface of a workpiece on which work is to be performed. The expression “substantially perpendicularly” is intended here to define, in particular, an alignment of a direction relative to a reference direction, the direction and the reference direction, in particular as viewed in one plane, enclosing an angle of 90° and the angle having a maximum deviation of, in particular, less than 8°, advantageously less than 5°, and particularly advantageously less than 2°. 
     Preferably, the stop unit is used to limit a movement distance of the tool receiver in the direction of the seating unit, relative to the seating unit, and/or to set a length of the movement distance of the tool receiver in the direction of the seating unit, relative to the seating unit. Preferably, a length of the movement distance of the tool receiver in the direction of the seating unit, relative to the seating unit, can be set by means of setting a position of the stop element relative to the cut-depth guide unit. Preferably, a depth of cut of a working tool, which goes into a workpiece surface when work is being performed on a workpiece, can be set by means of setting a length of the movement distance of the tool receiver, in particular with a working tool attached thereto, relative to the seating unit. A “seating unit” is to be understood here to mean, in particular, a unit that, while work is being performed on a workpiece by means of the portable power tool, the portable power tool being handled in the correct manner, is seated on the workpiece, in particular with a seating surface of the seating unit, and which is provided to support the portable power tool on the workpiece while work is being performed on the workpiece. Particularly preferably, the seating unit is realized as a slide pad and/or as a base plate. 
     The expression “movably mounted” is to be understood here to mean, in particular, a mounting of the stop element on the cut-depth guide unit, wherein the stop element, in particular in isolation from an elastic deformation of the stop element, has a capability to move relative to the cut-depth guide element, along at least one axis along a distance greater than 1 mm, preferably greater than 10 mm, and particularly preferably greater than 20 mm. Alternatively or additionally, however, it is also conceivable for the stop element to have a different movement capability, in particular relative to the cut-depth guide unit, considered appropriate by persons skilled in the art, such as, for example, a capability to move about least one axis, by an angle greater than 10°, preferably greater than 20°, and particularly preferably greater than 30°. The expression “cut-depth guide unit” is intended here to define, in particular, a unit provided to guide a component, during a movement along a predefined path, transversely in relation to a movement direction by means of an action of at least one constraining force. A “constraining force” is to be understood here to mean, in particular, a force provided to prevent a component from moving in at least one direction and/or to keep the component, during a movement, on a path defined by action of the force upon the component. 
     The term “stop movement unit” is intended here to define, in particular, a unit provided to allow, in addition to a capability of the stop element to move along the cut-depth guide path, a further capability of the stop element to move along and/or about a movement axis, relative to the cut-depth guide unit, in at least one operating state. Preferably, the movement axis of the stop element runs at least substantially parallelwise or at least substantially transversely in relation to the cut-depth guide path. “Substantially parallelwise” is intended here to mean, in particular, an alignment of a direction relative to a reference direction, in particular in one plane, wherein the direction deviates from the reference direction by, in particular, less than 8°, advantageously less than 5°, and particularly advantageously less than 2° and, in particular, is identical with reference direction. The expression “at least substantially transversely” is intended here to define, in particular, an alignment of a direction relative to a reference direction, wherein the direction and the reference direction, in particular as viewed in one plane, have mutually differing courses and, in particular, also differ from each other from purely opposite courses of the direction and reference direction. The movement axis can thus run along the cut-depth guide path or have a course that differs from a course of the cut-depth guide course. Preferably, the movement axis is realized as a pivot axis, about which the stop element is mounted so as to be movable relative to the cut-depth guide unit. It is also conceivable, however, for the stop movement unit to be provided to move the stop element along a movement axis running parallelwise in relation to the cut-depth guide path, in at least one state in which a cut-depth guide element of the cut-depth guide unit is fixed relative to a guide rail element of the cut-depth guide unit. 
     Preferably, owing to the further movement capability of the stop element, a stop surface of the stop element is moved by the stop movement unit along at least one distance, in at least one operating position, wherein at least one characteristic quantity of the distance such as, for example, a length of the distance and/or a radius of the distance, etc. corresponds to a dimension, in particular a height, of a constraining guide unit coupled to the portable power tool. The design of the cut-depth limiting device according to the disclosure thus makes it possible, advantageously, to achieve a setting of the stop element to take account of a further relevant parameter such as, for example, a height of a constraining guide unit, when a limitation of a depth of cut is being set, wherein, advantageously, a setting to take account of the parameter, in isolation from a setting of a limitation of the depth of cut, can be effected by means of a movement of the stop element, relative to the cut-depth guide unit, along the cut-depth guide path. Advantageously, therefore, for example in the case of a portable power tool, in particular a circular saw, a setting of a limitation of a depth of cut can be effected by means of a movement of the stop element, relative to the cut-depth guide unit, along the cut-depth guide path, and then, with the use of a constraining guide unit, in particular a guide rail that can be connected to the portable power tool in a form-closed manner, a height of the constraining guide unit can be taken into account, owing to the further movement capability of the stop element, wherein a previously set limitation of a depth of cut can be retained, advantageously, and a readjustment such as, for example, an alteration of a position of a display element and an adaptation of a position of the stop element along the cut-depth guide path, to take account of a height of a constraining guide unit, for the purpose of setting a limitation of a depth of cut, can be avoided. Advantageously, a high degree of operating comfort can thus be achieved. 
     Furthermore, it is proposed that the cut-depth guide unit comprise at least one cut-depth guide element, which is mounted so as to be movable relative to a guide rail element of the cut-depth guide unit and on which the stop element is mounted so as to be movable relative to the cut-depth guide element. The stop element in this case can be mounted in a pivotable and/or translationally movable manner on the cut-depth guide element, in order to achieve a further movement capability of the stop element. A “cut-depth guide element” is to be understood here to mean, in particular, an element that can be moved relative to the guide rail element, directly or indirectly by means of a form-closure connection to a form-closure region of the guide-rail element, at least substantially transversely in relation to a guide path, running form-closure direction, in particular the cut-depth guide path. The cut-depth guide element preferably has at least one latching element, which is integrally formed on to the cut-depth guide element and which is provided to fix the cut-depth guide element in at least one position relative to the guide rail element by acting in combination with latching recesses or with counter-latching element of the guide rail element. “Integrally” is to be understood to mean, in particular, connected in a materially bonded manner such as, for example, by a welding process and/or an adhesive bonding process etc. and, particularly advantageously, by being formed-on, such as, for example, by being produced from a casting and/or by being produced in a single- or multi-component injection process. It is also conceivable, however, for the cut-depth guide element to have at least one latching recess that, by acting in combination with latching elements integrally formed on to the guide rail element, enables the cut-depth guide element to be fixed in at least one position relative to the guide rail element. Owing to the design of the cut-depth limiting device according to the disclosure, a further capability of the stop element to move relative to the cut-depth guide unit can be achieved through simple design means. 
     Advantageously, the stop movement unit has at least one position fixing element, which is provided to fix the stop element in a position relative to the cut-depth guide element. Preferably, the position fixing element is realized as a spring-biased latching pin. Preferably, the position fixing element, realized as a spring-biased latching pin, engages in a position fixing recess of the cut-depth guide element for the purpose of fixing a position of the stop element relative to the cut-depth guide element. It is also conceivable, however, for the position fixing element to be of a different design, considered appropriate by persons skilled in the art, such as, for example, designed as a clamping element, etc. Advantageously, the stop element can be secured in a position relative to the cut-depth guide element in order, advantageously, to avoid an unintentional movement of the stop element relative to the cut-depth guide element. 
     It is additionally proposed that the cut-depth guide unit have at least one further cut-depth guide element, which is mounted so as to be movable relative to a guide rail element of the cut-depth guide unit and on which the cut-depth guide element is movably mounted. Preferably, the further cut-depth guide element is realized as a guide block. Preferably, the cut-depth guide element, realized as a guide block, has an indicator element. The indicator element is preferably provided to indicate to an operator, by means of a scale disposed on the guide rail element, a limitation of a depth of cut set by means of the cut-depth limiting device. It is also conceivable, however, for the indicator element to be realized as a digital display, by means of which a set limitation of a depth of cut can be represented. In this case, the cut-depth guide element is preferably pivotally mounted on the further cut-depth guide element. It is also conceivable, however, for the cut-depth guide element to be mounted in a translationally movable manner on the further cut-depth guide element. Owing to the design of the cut-depth limiting device according to the disclosure, guidance of the stop element, for the purpose of setting a limitation of a depth of cut and, in addition, a capability to lock the stop element relative to the guide rail element, for the purpose of limiting the depth of cut, can be achieved through simple design means. 
     Moreover, it is proposed that the cut-depth guide unit have at least one spring element, which is provided to apply a spring force to the cut-depth guide element in the direction of the guide rail element. A “spring element” is to be understood to mean, in particular, a macroscopic element having at least one extent that, in a normal operating state, can be varied elastically by at least 10%, in particular by at least 20%, preferably by at least 30%, and particularly advantageously by at least 50% and that, in particular, generates a counter-force, which is dependent on the variation of the extent and preferably proportional to the variation and which counteracts the variation. An “extent” of an element is to be understood to mean, in particular, a maximum distance of two points of a perpendicular projection of the element on to a plane. A “macroscopic element” is to be understood to mean, in particular, an element having an extent of at least 1 mm, in particular of at least 5 mm, and preferably of at least 10 mm. Preferably, the spring element is realized as a compression spring. It is also conceivable, however, for the spring element to be of different design, considered appropriate by persons skilled in the art. By means of the spring element it is possible to achieve, in particular, automatic latching of the latching element into corresponding latching recesses of the guide rail element, this being advantageous if the cut-depth guide element is designed so as to be integral with at least one latching element. 
     Furthermore, it is proposed that the stop movement unit have at least one stop movement element, realized as an operating lever, which is mounted on a cut-depth guide element of the cut-depth guide unit so as to be pivotable about the movement axis. It is also conceivable, however, for the stop movement element to be of a different design, considered appropriate by persons skilled in the art, such as, for example, designed as a pushbutton, as a slide, etc. Preferably, the stop movement element is movably mounted on the cut-depth guide element realized with at least one integrally formed-on latching element. This makes it possible, advantageously, to achieve comfortable operation of the stop movement unit, for the purpose of moving the stop element. 
     Advantageously, the stop element and the stop movement element are fixedly connected to each other. In this case, the stop element and the stop movement element can be connected to each other by means of a form-closure, force-closure and/or materially bonded connection. Preferably, the stop element and the stop movement element are fixedly connected to each other by means of a screwed connection. “Fixedly connected to each other” is to be understood here to mean, in particular, a connection between at least two components, by means of which a movement of one of the components is directly transmitted to the other component, in particular in isolation from interposed components, with the exception of connecting elements. It is also conceivable, however, for the stop element and the stop movement element to be connected to each other in a motionally dependent manner via an interposed unit such as, for example, a transmission, or a lever mechanism, etc. Preferably, the stop element and the stop movement element are offset relative to each other by approximately 180°. By simple design means, a movement of the stop movement element can be transmitted to the stop element. Particularly if a screwed connection is used, an inexpensive variant can be achieved for the transmission of movement between the stop element and the stop movement element. 
     Furthermore, it is proposed that the movement axis of the stop element run at least substantially perpendicularly in relation to a course of the cut-depth guide path. It is also conceivable, however, for the movement axis of the stop element to run at least substantially parallelwise in relation to the cut-depth guide path. Advantageously, a compact arrangement of the stop element can be achieved. 
     Advantageously, the stop element is mounted on the cut-depth guide element so as to be pivotable about the movement axis. Preferably, the stop element is mounted on the cut-depth guide element so as to be pivotable relative to the cut-depth guide element. It is also conceivable, however, for the stop element to be mounted on the cut-depth guide element so as to be translationally movable relative to the cut-depth guide element. The fact that the stop element is pivotally mounted makes it possible, advantageously, to achieve a mounting of the stop element that is not susceptible to dirt. Thus, advantageously, a robust stop movement unit can be realized. 
     The disclosure is additionally based on a portable power tool, in particular a circular saw, comprising a cut-depth limiting device according to the disclosure. A “portable power tool” is to be understood here to mean, in particular, a power tool, for performing work on workpieces, that can be transported by an operator without the use of a transport machine. The portable power tool has, in particular, a mass of less than 40 kg, preferably less than 10 kg, and particularly preferably less than 5 kg. Particularly preferably, the portable power tool is realized as plunge-cut circular saw. It is also conceivable, however, for the portable power tool to be of a different design, considered appropriate by persons skilled in the art, such as, for example, designed as a plunge-cut saw, as an electric handsaw, etc. Advantageously, a high degree of operating comfort can be achieved for an operator of the portable power tool. 
     The cut-depth limiting device according to the disclosure and/or the portable power tool according to the disclosure are/is not intended in this case to be limited to the application and embodiment described above. In particular, the cut-depth limiting device according to the disclosure and/or the portable power tool according to the disclosure may have individual elements, components and units that differ in number from a number stated herein, in order to fulfill a principle of function described herein. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Further advantages are given by the following description of the drawing. The drawing shows an exemplary embodiment of the disclosure. The drawing, the description and the claims contain numerous features in combination. Persons skilled in the art will also expediently consider the features individually and combine them to create appropriate further combinations. 
       In the drawing: 
         FIG. 1  shows a schematic representation of a portable power tool according to the disclosure, having a cut-depth limiting device according to the disclosure, 
         FIG. 2  shows a schematic, exploded representation of the cut-depth limiting device according to the disclosure when demounted from the portable power tool, 
         FIG. 3 a    shows a schematic representation of a side view of the portable power tool according to the disclosure while work is being performed on a workpiece, wherein a power-tool stop region bears against a stop element of a stop unit of the cut-depth limiting device according to the disclosure, which stop element is in a workpiece position, 
         FIG. 3 b    shows a schematic representation of a side view of the portable power tool according to the disclosure, while work is being performed on a workpiece, with a constraining guide unit coupled to the portable power tool according to the invention disclosure, wherein the power-tool stop region bears against the stop element, which is in a constraining guide unit position, 
         FIG. 4 a    shows a schematic representation of a detail view of the cut-depth limiting device according to the disclosure, with the stop element in a workpiece position, and 
         FIG. 4 b    shows a schematic representation of a detail view of the cut-depth limiting device according to the disclosure, with the stop element in a constraining guide unit position. 
     
    
    
     DETAILED DESCRIPTION 
       FIG. 1  shows a portable power tool  12 , realized as a plunge-cut saw, which comprises a cut-depth limiting device  10 . The portable power tool  12  additionally comprises a power tool housing  38 , which is provided to enclose a drive unit  40  of the portable power tool  12 . The drive unit  40  comprises a drive shaft (not represented in greater detail here) for driving a working tool  42  ( FIGS. 3 a  and 3 b   ), which can be coupled to a tool receiver (not represented in greater detail here) of the portable power tool  12 , in a manner already known to persons skilled in the art. The portable power tool  12  additionally comprises a seating unit  44 , realized as a base plate or slide pad, by means of which the portable power tool  12 , when performing work on a workpiece  86  ( FIG. 3 a   ), is seated on a workpiece surface of the workpiece  86 , or slides on the workpiece surface during a movement to make a cut in the workpiece  86 . Additionally disposed on the seating unit  44  is a safety unit  46  of the portable power tool  12 , which protects an operator against injury when performing work n the workpiece  86 . In this case, the safety unit  46  is realized as a safety hood, which surrounds the working tool  42 , when mounted, by more than 160° along a rotational direction of the drive shaft. The safety unit  46  additionally has a suction coupling element  48 , which can be connected to a suction unit (not represented in greater detail here) for extracting removed workpiece particles by suction as work is being performed on the workpiece  86 . The power tool housing  38  is mounted on the safety unit  46  so as to be pivotable relative to the seating unit  44 . In this case, the power tool housing  38  is mounted on the safety unit  46  so as to be pivotable about two pivot axes  50 ,  52 , relative to the seating unit  44 , in a manner already known to persons skilled in the art. The two pivot axes  50 ,  52  extend at least substantially perpendicularly relative to each other. In this case, the safety unit  46 , together with the power tool housing  38 , is mounted on the seating unit  44  so as to be pivotable about the pivot axis  50 , relative to the seating unit  44 . The portable power tool  12  is thus of a design that is at least substantially already known to persons skilled in the art. 
     The cut-depth limiting device  10  for the portable power tool  12  is disposed on the safety unit  46 , on a side of the safety unit  46  that faces toward the power tool housing  38 , for the purpose of setting a limitation of a depth of cut. It is also conceivable, however, for the cut-depth limiting device  10  to be disposed at a different position on the safety unit  46 , considered appropriate by persons skilled in the art, or on a different component of the portable power tool  12 . The cut-depth limiting device  10  comprises at least one cut-depth guide unit  14  and at least one stop unit  16 , which has at least one stop element  18  that, for the purpose of limiting a depth of cut, has a capability to move relative to the cut-depth guide unit  14  along a cut-depth guide path  20  of the cut-depth guide unit  14  ( FIG. 2 ). In this case, for the purpose of setting a limitation of a depth of cut of the working tool  42 , the stop element  18  is mounted so as to be translationally movable along the cut-depth guide path  20 . By means of a cut-depth guide element  28  of the cut-depth guide unit  14 , the stop element  18  is mounted on a guide rail element  26  of the cut-depth guide unit  14  so as to be movable along the cut-depth guide path  20 . In this case, the stop element  18  is mounted on the cut-depth guide element  28  so as to be movable relative to the cut-depth guide element  28 . The cut-depth guide unit  14  thus comprises at least the cut-depth guide element  28 , which is mounted so as to be movable relative to the guide rail element  26  of the cut-depth guide unit  14 , and on which the stop element  18  is mounted so as to be movable relative to the cut-depth guide element  28 . 
     The cut-depth guide unit  14  has at least one further cut-depth guide element  32 , which is mounted so as to be movable relative to the guide rail element  26 , and on which the cut-depth guide element  28 , provided for mounting the stop element  18 , is movably mounted. The further cut-depth guide element  32  is realized as a guide block element that, by means of a form-closure connection to a form-closure region  56  of the guide rail element  26  ( FIG. 2 ), is mounted on the guide rail element  26  so as to be movable along the cut-depth guide path  20 . For the purpose of producing a latched connection in order to fix a position of the cut-depth guide element  28  and of the further cut-depth guide element  32  relative to the guide rail element  26 , the cut-depth guide element  28 , provided for mounting the stop element  18 , is mounted on the further cut-depth guide element  32  so as to pivotable about a pivot axis  80  that runs at least substantially perpendicularly in relation to the cut-depth guide path  20 . The cut-depth guide element  28  is thus realized as a cut-depth latching element, which has at least one integrally formed-on latching element  54 . It is also conceivable, however, for the latching element  54  to be separate from the cut-depth guide element  28 , and to be fixedly connected to the cut-depth guide element  28  by means of a type of connection considered appropriate by persons skilled in the art, such as, for example, by means of a form-closure and/or force-closure connection. The latching element  54  is realized as a latching lug, which has a polygonal cross section. The cut-depth guide element  28  has a total of four latching elements  54 , which are integrally formed on to the cut-depth guide element  28  and parallel to each other. It is also conceivable, however, for a number other than four latching elements  54  to be integrally formed on to the cut-depth guide element  28 . 
     For the purpose of producing a latched connection to the cut-depth guide element  28 , realized as a cut-depth latching element, the guide rail element  26  has a latching rail  58 . For the purpose of forming a latched connection to the cut-depth guide element  28 , realized as with a cut-depth latching element, the latching rail  58  has counter-latching elements  60 , which are realized to correspond with the latching elements  54  of the cut-depth guide element  28 . On a side of the guide rail element  26  that faces away from the latching rail  58 , the guide rail element  26  has a measurement scale  82 , which acts in combination with a pointer element  84  disposed on the further cut-depth guide element  32 , for the purpose of indicating a cut depth dimension that corresponds to a cut depth limitation set by means of the stop unit  16 . It is also conceivable, however, for the cut-depth limiting device  10  to comprise a digital display for displaying a cut depth dimension that corresponds to a set limitation of a depth of cut. 
     The cut-depth guide unit  14  additionally has at least one spring element  34 , which is provided to apply a spring force to the cut-depth guide element  28  in the direction of the guide rail element  26 . This results in engagement of the latching elements  54  and counter-latching elements  60  when the cut-depth guide element  28  is in a non-actuated state. For the purpose of releasing the latched connection between the latching elements  54  and counter-latching elements  60 , the cut-depth guide element  28  has an actuating region  62 . An actuation of the actuating region  62  causes the cut-depth guide element  28  to be pivoted about the pivot axis  80 , relative to the further cut-depth guide element  32 . This causes the latching elements  54  and counter-latching elements  60  to be become disengaged. The further cut-depth guide element  32 , realized as a guide block element, can thus be displaced, together with the cut-depth guide element  28 , realized as a cut-depth latching element, along the cut-depth guide path  20 , relative to the guide rail element  26 . Since the stop element  18  is disposed on the cut-depth guide element  28 , the stop element  18  is then likewise displaced along the cut-depth guide path  20 , relative to the guide rail element  26 . As a result of this, a limitation of a depth of cut of the working tool  42  is set. The cut-depth guide element  28  and the further cut-depth guide element  32  thus constitute a part of the stop unit  16 . When work is being performed on the workpiece  86  by means of the working tool  42 , upon a pivot movement of the power tool housing  38  relative to the safety unit  46 , for the purpose of making a cut in the workpiece  86 , or removing workpiece particles of the workpiece  86 , a stop region  64  of the power tool housing  38  strikes against the stop element  18  when a depth of cut, set by means of the stop unit  16 , has been reached. 
     The cut-depth limiting device  10  additionally comprises at least one stop movement unit  22 , which is provided to allow a further capability of the stop element  18  to move relative to the cut-depth guide unit  14 , along and/or about a movement axis  24 , at least when in an operating state. The stop movement unit  22  is provided to allow a further capability of the stop element  18  to move relative to the cut-depth guide unit  14 , at least when the latching elements  54  of the cut-depth guide element  28  have been latched in the counter-latching elements  60  of the guide rail element  26 . The stop movement unit  22  is thus provided to allow a further capability of the stop element  18  to move relative to the cut-depth guide element  28 , by means of the cut-depth guide element  28  realized as a cut-depth latching element, at least when the further cut-depth guide element  32 , realized as a guide block element, is in a fixed position. 
     The stop element  18  is mounted on the cut-depth guide element  28  so as to be pivotable about the movement axis  24 , realized as a stop pivot axis  66 , relative to the cut-depth guide element  28 . The stop pivot axis  66  runs at least substantially perpendicularly in relation to a course of the cut-depth guide path  20 . In addition, the stop pivot axis  66  runs at least substantially parallelwise in relation to the pivot axis  80 , about which the mounted cut-depth guide element  28  can be pivoted relative to the further cut-depth guide element  32 . It is also conceivable, however, for the stop pivot axis  66  to have a different course, considered appropriate by persons skilled in the art, such as, for example, a course running parallelwise in relation to the cut-depth guide path  20  or transversely in relation to the cut-depth guide path  20 , etc. 
     The stop movement unit  22  comprises at least one position fixing element  30 , which is provided to fix the stop element  18  in a position relative to the cut-depth guide element  28 . The position fixing element  30  is realized as a latching pin  68 , which is biased with a spring force by means of a position fixing spring element  70  of the stop movement unit  22 . The stop movement unit  22  has a total of two position fixing elements  30 , which are each assigned to a position of the stop element  18  relative to the cut-depth guide element  28 . For the purpose of moving the stop element  18 , the stop movement unit  22  has at least one stop movement element  36 , which is realized as an operating lever, and which is mounted on the cut-depth guide element  28  of the cut-depth guide unit  14  so as to be pivotable about the movement axis  24 . The stop element and the stop movement element  36  are fixedly connected to each other. In this case, the stop element  18  is fixedly connected to the stop movement element  36  by means of a screwed connection, which comprises a screw  72 , which can be screwed into the stop movement element  36 , and a washer  74 . The stop element  18  is thus motionally dependent on a movement of the stop movement element  36 . The stop movement element  36  has a latching recess  76 , in which one of the two positioning fixing elements  30  engages for the purpose of fixing a position of the stop movement element  36 , and thus of the stop element  18 , in dependence on a position of the stop movement element  36 , and thus of the stop element  18 , relative to the cut-depth guide element  28 . The two position fixing elements  30  are disposed on the cut-depth guide element  28 , offset relative to each other by approximately 90° ( FIGS. 4 a  and 4 b   ). In this case, a spring force of one of two position fixing spring elements  70  of the stop movement unit  22  acts, respectively, upon each of the position fixing elements  30 , realized as latching pins  68 , in the direction of the stop movement element  36 . 
     Thus, after a limitation of a depth of cut has been set, the stop element  18  can additionally be moved, about the movement axis  24  realized as a stop pivot axis  66 , from a workpiece position ( FIGS. 3 a  and 4 a   ) of the stop element  18  to a constraining guide unit position of the stop element  18  ( FIGS. 3 b  and 4 b   ), by means of the stop movement unit  22 . The stop element  18  and the stop movement element  36  are mounted on the cut-depth guide element  28  such that they are each pivotable about the movement axis  24 , realized as a stop pivot axis  66 , relative to the cut-depth guide element  28  by an angle of 90°, starting from the workpiece position or the constraining guide position of the stop element  18 . When the stop element  18  is in the workpiece position, a first stop surface of the stop element  18  therefore constitutes a limiting surface, against which the stop region  64  of the power tool housing  38  can strike, upon a pivot movement relative to the safety unit  46  about the pivot axis  52 , for the purpose of limiting a depth of cut. When the stop element  18  is in the constraining guide unit position, a second stop surface of the stop element  18 , which is offset at least substantially by 90° in relation to the first stop surface of the stop element  18 , constitutes a further limiting surface against which the stop region  64  of the power tool housing  38  can strike, upon a pivot movement about the pivot axis  52 , relative to the safety unit  46 , for the purpose of limiting a depth of cut in the case of use of a constraining guide unit  78  of a power tool system comprising the portable power tool  12 , while work is being performed on the workpiece  86 . 
     As a result of this, for example in the case of use of the constraining guide unit  78  ( FIG. 3 b   ) of the power tool system, a previously set limitation of a depth of cut, with the stop element  18  in the workpiece position, can be adapted to a height of the constraining guide unit  78 . In the case of a previously set depth of cut, changing the stop element  18  over from the workpiece position to the constraining guide position, while work is being performed on the workpiece  86 , has the effect that, when the stop element  18  is in the constraining guide position, in the case of use of the constraining guide unit  78 , the working tool  42  penetrates into, or comes out of, the workpiece  86  to the same extent as when the stop element  18  is in the workpiece position, disassociated from use of the constraining guide unit  78 . In this case, the constraining guide unit  78  is realized as a guide rail, which can be disposed on the workpiece  86 . The constraining guide unit  78  realized as a guide rail is provided to guide the portable power tool  12  along at least one direction. A movement of the stop element  18  relative to the cut-depth guide element  28  realized as a cut-depth latching element, from the workpiece position to the constraining guide unit position, in the case of use of a constraining guide unit  78 , while work is performed on the workpiece  86  by means of the portable power tool  12 , compensates a height of the constraining guide unit  78 . Thus, whether it is selected to perform work on the workpiece  86  with use of the constraining guide unit  78 , or it is selected to perform work on the workpiece  86  without use of the constraining guide unit  78 , there is no need for readjustment of a setting of a limitation of the depth of cut by means of a movement of the cut-depth guide element  28  and of the further cut-depth guide element  32  for the purpose of displacing the stop element  18  along the cut-depth guide path  20 , relative to the guide rail element  26 . A pivot movement of the stop element  18  about the movement axis  24  realized as a stop pivot axis  66 , relative to the fixed cut-depth guide element  28 , starting from the workpiece position of the stop element  18 , is thus provided to adapt a limitation of a depth of cut, set with the stop element  18  in the workpiece position, in the case of use of the constraining guide unit  78 , while work is performed on the workpiece  86 , to a height of the constraining guide unit  78 . The stop region  64  of the power tool housing  38  strikes when the stop element  18  is in the workpiece position, with the position of the cut-depth guide element  28  relative to the guide rail element  26  remaining the same, for the purpose of fixedly setting a limitation of a depth of cut, as compared with striking of the stop region  64  of the power tool housing  38  after a relatively short distance, along which the power tool housing  38  is pivoted about the pivot axis  52  relative to the safety unit  46  for the purpose of making a cut by means of the working tool  42 , when the stop element  18  is in the constraining guide unit position.