Abstract:
A closure device, in particular a tool-holder closure device, includes at least one movably mounted closure element and at least one securing unit. The securing unit includes at least one movably mounted securing element configured to secure the closure element in at least one position thereof. The closure device further includes at least one stop unit which has at least one stop element. The stop element, depending on at least one position of the closure element, is configured to stop the securing element at least largely against a movement relative to the closure element.

Description:
This application is a 35 U.S.C. §371 National Stage Application of PCT/EP2013/059986, filed on May 15, 2013, which claims the benefit of priority to Serial No. DE 10 2012 211 098.4, filed on Jun. 28, 2012 in Germany, the disclosures of which are incorporated herein by reference in their entirety. 
     BACKGROUND 
     Closure devices which include a movably mounted closure element and a fixing unit which comprises a movably mounted fixing element for fixing the closure element in at least one position of the closure element are already known. 
     SUMMARY 
     The disclosure proceeds from a closure device, in particular a tool holder closure device, having at least one movably mounted closure element and having at least one fixing unit which comprises at least one movably mounted fixing element for fixing the closure element in at least one position of the closure element. 
     It is proposed that the closure device comprises at least one locking unit which includes at least one locking element which locks the fixing element at least extensively against a movement relative to the closure element in dependence on at least one position of the closure element. In this connection, the closure device can be realized as a box closure device, such as, for example, a tool box closure device or as a hand-held machine tool box closure device. In a particularly preferred manner, the closure device is realized as a tool holder closure device. However, it is also conceivable for the closure device to comprise another development that appears sensible to an expert. The term “movably mounted”, in this case, is to define in particular a bearing arrangement of a unit and/or of an element relative to at least one further unit and/or relative to a further element, the unit and/or the element, in particular decoupled from elastically deforming the unit and/or the element and decoupled from movement possibilities that are produced due to bearing play, comprising a movement possibility along at least one axis along a section greater than 1 mm, in a preferred manner greater than 10 mm and in a particularly preferred manner greater than 20 mm and/or a movement possibility about at least one axis by and angle greater than 10°, in a preferred manner greater than 45° and in a particularly preferred manner greater than 60°. 
     A “closure element” is to be understood in this context in particular as an element which is provided, in at least one position, in particular in a closure position, for the purpose of exerting a holding force onto a further element that is abutting against the closure element or fixing or closing two components that are movable relative to one another. The term “provided” is to be understood, in particular, as especially programmed, designed and/or equipped. The closure element is realized in a preferred manner as a tool holder element of a tool holder. The tool holder is provided in a preferred manner for the purpose of receiving a tool holder in a positive locking and/or non-positive locking manner or of fixing a machine tool separating device on a basic body of the tool holder by means of a positive locking and/or by means of non-positive locking connection by means the closure element. For fixing a machine tool separating device on the basic body in a preferred manner by means of a positive locking connection, the closure element exerts a holding force in the direction of the basic body onto a guide unit of the machine tool separating device. For transmitting driving forces to the machine tool separating device, the machine tool separating device is preferably received by the tool holder or is fixed on the basic body of the tool holder. In this connection, at least in a fixing position, the closure element preferably exerts a holding force onto the machine tool separating device, in particular in at least a state with the machine tool separating device connected to the tool holder. In addition, the closure element is preferably mounted so as to be pivotable about a movement axis of the closure element. In this connection, the movement axis of the closure element extends in a preferred manner at least substantially parallel to a clamping face of the closure element. 
     In this connection, it is conceivable for the closure element to be acted upon with a spring force of a spring element of the closure device in at least one position, in particular in a disengaging position, of the closure element. The term “substantially parallel” is to be understood in this context in particular as an alignment of a direction relative to a reference direction, in particular in one plane, the direction deviating from the reference direction in particular by less than 8°, in an advantageous manner by less than 5° and in a particularly advantageous manner by less than 2°. The clamping face of the closure element is preferably provided for the purpose of abutting against a machine tool separating device that is arranged in the tool holder in the fixing position, in particular against a guide unit of the machine tool separating device. As a result, a holding force is exerted onto the machine tool separating device by means of the clamping face of the closure element in a fixing position of the closure element. 
     The term “locking unit” in this context in particular is to define a unit which is provided for the purpose of preventing, at least extensively, by means of a positive locking and/or non-positive locking connection, a movement of an element relative to a further element, in particular of preventing, at least extensively, a movement of an element relative to a further element in two oppositely directed directions. In a particularly preferred manner, the locking unit is provided for the purpose of fixing the fixing element, at least in a disengaging position of the closure element, against a movement relative to the closure element. In the disengaging position of the closure element, a machine tool separating device is preferably able to be removed from or inserted into a receiving recess of a basic body of the tool holder. The locking unit or the locking element preferably releases a movement of the fixing element in a fixing position of the closure element. Consequently, the fixing element is movable relative to the closure element in a fixing position of the closure element. The fixing element is movable into a locking position in a fixing position of the closure element. In a locking position of the fixing element, the closure element is fixed on the basic body of the tool holder at least by means of the fixing element against a movement of the closure element into a disengaging position of the closure element. By means of the development according to the disclosure of the closure device, convenient operability can be achieved in an advantageous manner. In addition, an unintended movement of the fixing element into a locking position of the fixing element in a disengaging position of the closure element can be avoided in an advantageous manner by means of the locking element. Consequently, an adverse effect of a movement of the closure element, proceeding from a disengaging position of the closure element, into a fixing position of the closure element as a consequence of a fixing element that has already been moved into a locking position can be avoided in an advantageous manner. 
     In addition, it is proposed that the locking element is arranged so as to be movable on the fixing element. The term “arranged so as to movable” is to be understood in this context in particular as a movable bearing arrangement of the locking element on the fixing element or an arrangement of the locking element on the fixing element which enables a movement of at least one part region of the locking element relative to the fixing element, in particular as a result of the locking element deforming elastically. Consequently, transferring the locking element from a locking position into a release position can be achieved in a structurally simple manner. 
     In addition, it is proposed that the locking element is realized integrally with the fixing element. The term “integrally” is to be understood in particular as at least positive material bonding, for example as a result of a welding process, an adhesive process, a spray-on process and/or another process that appears sensible to the expert, and/or is to be understood as formed advantageously in one piece, such as, for example, as a result of production from a casting and/or as a result of production using a single or multiple component injection method and in an advantageous manner from one single blank. However, it is also conceivable for the locking element to be realized separately from the fixing element and to be mounted so as to be movable on the fixing element. A compact locking unit can be achieved in an advantageous manner by means of the development according to the disclosure of the closure device. In addition, installation space, assembly expenditure and costs can be saved in an advantageous manner. 
     In addition, it is proposed that the locking element is realized as a resilient continuation. A “resilient continuation” is to be understood in this context in particular as an element which changes its original shape and/or its original alignment relative to a further element under the influence of a force and, when the influencing force is taken away, returns into the original shape and/or assumes the original alignment again relative to the further element and consequently generates a counter force that works against deformation. However, it is also conceivable for the locking element to be realized as a rigid element which is acted upon with a spring force of a spring element of the locking unit. Other developments that appear sensible to an expert are also conceivable. By means of the development according to the disclosure, automatic resetting of the locking element into a locking position of the locking element can be achieved in an advantageous manner. Consequently, greater operating convenience can be achieved in an advantageous manner. 
     In addition, it is proposed that the locking unit includes at least one stop element against which the locking element abuts for locking the fixing element in at least one position of the locking element. In a preferred manner, the stop element is realized integrally with the closure element. However, it is also conceivable for the stop element to be realized separately from the closure element and to be fastened on the closure element by means of at least one fastening element which appears sensible to an expert. The fixing element is able to be locked in a structurally simple manner as a result of a positive locking connection between the locking element and the stop element. In addition, a compact closure device can be achieved in an advantageous manner. 
     In addition, it is proposed that the locking unit includes at least one disengaging element which moves the locking element away from a stop element of the locking unit for mobility of the fixing element. In a preferred manner, the disengaging element is provided for the purpose of moving the locking element away from a stop element of the locking unit as a result of a movement of the closure element. The disengaging element is preferably realized integrally with the basic body of the tool holder. However, it is also conceivable for the disengaging element to be mounted movably on the closure element or movably on the fixing element such as, for example, as a slide etc. By means of the development according to the disclosure, in an advantageous manner a locking of the fixing element can be lifted in order to enable the fixing element to move relative to the closure element. 
     In addition, it is proposed that the disengaging element comprises at least one inclined face which, as a result of a movement of the closure element, exerts a force component onto the locking element in the direction of a release position of the locking element. The locking element is moved into contact with the inclined face of the disengaging element as a result of a movement, in particular a pivoting movement, of the closure element. Sliding friction can be utilized in an advantageous manner for transferring the locking element into a release position of the locking element. Consequently, a deflection of the locking element can be achieved in an advantageous manner for moving the locking element into a release position. In addition, a movement-dependent or position-dependent releasing of the locking element can be achieved in an advantageous manner. 
     In addition, it is proposed that the fixing element is mounted on the closure element so as to be pivotable. In this connection, a movement axis of the fixing element extends in a preferred manner at least substantially parallel to the movement axis of the closure element. A principle of a lever can be utilized in an advantageous manner to generate an actuating force. In addition, a toggle lever principle can be realized in an advantageous manner for fixing the closure element. 
     In addition, the disclosure proceeds from a tool holder with a closure device according to the disclosure. The closure device is preferably arranged on a basic body of the tool holder. The basic body, in a preferred manner, is mounted so as to be rotatable on a machine tool housing of a machine tool. As a result, in an advantageous manner a tool holder that can be securely closed and conveniently operated can be realized. 
     In addition, the disclosure proceeds from a machine tool with a tool holder according to the disclosure. In a particularly preferred manner, the machine tool is realized as a portable machine tool. The tool holder, in a preferred manner, is provided for positive and/or non-positive coupling with a machine tool separating device. A “portable machine tool” is to be understood in this context in particular as a machine tool, in particular a hand-held machine tool, which is able to be transported by an operator without a transporting machine. The portable machine tool comprises in particular a mass which is smaller than 40 kg, in a preferred manner smaller than 10 kg and in a particularly preferred manner smaller than 5 kg. A machine tool on which a machine tool separating device is able to be arranged in a particularly convenient manner can be advantageously achieved. 
     In a particularly preferred manner, the machine tool and the machine tool separating device form a machine tool system. The machine tool separating device, in a preferred manner, includes at least one cutting train and at least one guide unit, which together with the cutting train forms a closed system. Consequently, the machine tool separating device itself is realized in a preferred manner as a closed system. A “cutting train” is to be understood in this context in particular as a unit which is provided for the purpose of locally eliminating an atomic cohesion of a workpiece to be machined, in particular by means of mechanically cutting off and/or by means of mechanical removing material particles of the workpiece. In a preferred manner, the cutting train is provided for the purpose of separating the workpiece into at least two parts that are physically separate from one another and/or of cutting off and/or removing at least in part material particles of the workpiece proceeding from a surface of the workpiece. The cutting train, in a preferred manner, is realized as a cutting chain. However, it is also conceivable for the cutting train to comprise another development that appears sensible to an expert such as, for example, a development as a cutting line on which cutting elements are fixed. 
     The term “guide unit” is to define in this context in particular a unit which is provided for the purpose of exerting a constraining force onto the cutting train at least along a direction perpendicular to a cutting direction of the cutting train in order to define a movement possibility of the cutting train along the cutting direction. A “cutting direction” is to be understood in this context in particular as a direction along which the cutting train is moved to generate a cutting gap and/or to cut off and/or to 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 driving torque, in particular in the guide unit. In a preferred manner, the cutting train is moved in an operating state relative to the guide unit along the cutting direction. The term “closed system” is to define in this context in particular a system which includes at least two components which, by means of interaction, with the system in a disassembled state, retain a functionality from a system that is higher-ranking to the system, in particular the tool holder, and/or which are captively connected to one another in the disassembled state. In a preferred manner, the at least two components of the closed system are connected together in a manner that is at least substantially non-disengageable for the operator. “At least substantially non-disengageable” is to be understood in this context in particular as a connection between at least two components which are separable from one another only by using separating tools, such as, for example, a saw, in particular a mechanical saw, etc., and/or chemical separating agents such as, for example, solvents etc. 
     The machine tool separating device, in particular when viewed along a direction that extends at least substantially perpendicularly to a cutting plane of the machine tool separating device, comprises a maximum dimension that is smaller than 10 mm, in a preferred manner smaller than 8 mm and in a particularly preferred manner smaller than 5 mm. The dimension is preferably realized as the width of the machine tool separating device. In a particularly preferred manner, the machine tool separating device, when viewed along the direction that extends at least substantially perpendicularly to the cutting plane of the machine tool separating device, comprises an at least substantially constant maximum dimension along an overall length of the machine tool separating device. Consequently, the machine tool separating device is preferably provided for the purpose of generating a cutting gap which, when viewed along the direction that extends at least substantially perpendicularly to a cutting plane of the machine tool separating device, comprises a maximum dimension that is smaller than 5 mm. By means of the machine tool system, an adaptation to different fields of application can be achieved in a particularly convenient manner by the machine tool separating device being removable in an advantageous manner from the tool holder. 
     The closure device according to the disclosure, the tool holder according to the disclosure and/or the machine tool according to the disclosure is/are not to be restricted, in this connection, to the above-described application and embodiment. In particular, the closure device according to the disclosure, the tool holder according to the disclosure and/or the machine tool according to the disclosure can comprise a number of individual elements, components and units that deviates from the number named herein to fulfill a method of operation described herein. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Further advantages are produced from the following description of the drawing. An exemplary embodiment of the disclosure is shown in the drawing. The drawing, the description and the claims include numerous features in combination. In an expedient manner, the expert will also observe the features individually and combine them to form sensible further combinations. 
       The drawing is as follows: 
         FIG. 1  shows a schematic representation of a portable machine tool according to the disclosure with a tool holder according to the disclosure and 
         FIG. 2  shows a schematic representation of a view of a detail of the tool holder according to the disclosure in a state disassembled from the portable machine tool according to the disclosure with a closure device according to the disclosure, 
         FIG. 3  shows a schematic representation of a view of a further detail of the tool holder according to the disclosure in a state disassembled from the portable machine tool according to the disclosure with the closure device according to the disclosure and 
         FIG. 4  shows a schematic representation of a view of a detail of a fixing element of the closure device according to the disclosure. 
     
    
    
     DETAILED DESCRIPTION 
       FIG. 1  shows a machine tool  38  formed by a portable machine tool with a tool holder  36  for a positive locking and/or non-positive locking coupling of a machine tool separating device  40 . The portable machine tool  38  and the machine tool separating device  40  together form a machine tool system. The machine tool separating device  40  includes at least one cutting train  42  and at least one guide unit  44  for guiding the cutting train  42 . The guide unit  44  and the cutting train  42  together form a closed system. Consequently, the machine tool separating device  40  is realized as a closed system. In addition, the machine tool  38  comprises a machine tool housing  46  which surrounds a drive unit  48  and a transmission unit  50  of the machine tool  38 . The drive unit  48  and the transmission unit  50  are connected together operatively in a manner that is already known to an expert to generate a driving torque which is transmittable to the machine tool separating device  40 . The transmission unit  50  is realized as a miter gear. The drive unit  48  is realized as an electric motor unit. However it is also conceivable for the drive unit  48  and/or the transmission unit  50  to comprise a different development that appears sensible to an expert, such as, for example, a development of the drive unit  48  as a hybrid drive unit or as an internal combustion drive unit etc., and/or a development of the transmission unit  50  as a worm gear etc. The drive unit  48  is provided for the purpose of driving the cutting train  42  of the machine tool separating device  40  in at least one operating state by means of the transmission unit  50 . In this connection, the cutting train  42  is moved in the guide unit  44  of the machine tool separating device  40  along a cutting direction of the cutting train  42  relative to the guide unit  44 . The cutting train  42  is moved circulating around the guide unit  44  in operation. 
     The tool holder  36  is provided for receiving the machine tool separating device  40  realized as a closed system. In this connection, the tool holder  36  includes at least the closure device  10  and a basic body  52 . The basic body  52  is mounted on the machine tool housing  46  of the machine tool  38  so as to be rotatable. The basic body  52  is mounted on the machine tool housing  46  so as to be rotatable about a rotational axis  64  of the basic body  52  that is at least substantially parallel to a rotational axis of a drive element (not shown in any more detail here) of the tool holder  36  and/or of the machine tool  38 . For fixing a rotational position of the basic body  52  relative to the machine tool housing  46 , the machine tool  38  comprises at least one rotational positioning unit (not shown in any more detail here). The closure device  10  is arranged on the basic body  52  of the tool holder  36 . Consequently, the closure device  10  is realized as a tool holder closure device. In addition, the closure device  10  includes at least one movably mounted closure element  12  and at least one fixing unit  14  which comprises at least one movably mounted fixing element  16  for fixing the closure element  12  in at least one position of the closure element  12 . The closure element  12  is realized as a tool holding element. In this connection, the closure element  12  is mounted on the basic body  52  so as to be pivotable about a movement axis  54  of the closure element  12  which extends at least substantially parallel to a clamping face  60  of the closure element  12 . 
     The basic body  52  comprises a receiving recess  56  for at least partially receiving the machine tool separating device  40  in a state with the machine tool separating device  40  coupled to the tool holder  36 . The receiving recess  56  of the basic body  52  and the clamping face  60  of the closure element  12  interact for fixing the machine tool separating device  40  on the tool holder  36  in a positive locking and/or non-positive locking manner. As a result, in a state with the machine tool separating device  40  arranged on the tool holder  36 , a holding force is exerted onto the machine tool separating device  40 . In addition, the receiving recess  56  comprises a form that corresponds with a part region of a periphery of the machine tool separating device  40 . Consequently, forces and/or torques in a cutting plane of the machine tool separating device  40  are supported on the tool holder  36  by means of the receiving recess  56 . 
     In addition, the basic body  52  comprises a rotational play opening  58  in which the drive element (not shown in any more detail here) of the tool holder  36  and/or of the machine tool  38  is arranged. The drive element is provided for the purpose of transmitting a driving force of the drive unit  48  to the cutting train  42 . Consequently, the drive element, in a state with the machine tool separating device  40  connected to the tool holder  36 , engages in the cutting train  42 . In this connection, the drive element engages in drive recesses of cutting train segments of the cutting train  42  (not shown in any more detail here). 
     In addition, the closure device  10  includes at least one locking unit  18  which includes at least one locking element  20  which locks the fixing element  16  at least extensively against a movement relative to the closure element  12  in dependence on at least one position of the closure element  12 . In this connection, the locking element  20  locks the fixing element  16  at least extensively against a movement relative to the closure element  12  in a disengaging position of the closure element  12 . In a disengaging position of the closure element  12 , the closure element  12  is arranged pivoted in a direction directed away from the basic body  52  relative to the basic body  52 . Consequently, the clamping face  60  of the closure element  12 , in a disengaging position of the closure element  12 , is aligned at least substantially transversely with respect to a stop face  62  of the basic body  52  which defines the receiving recess  56 . The stop face  62  of the basic body  52 , in this connection, at least substantially perpendicularly to the rotational axis  64  of the basic body  52 . In a fixing position of the closure element  12 , in which a holding force for fixing the machine tool separating device  40  in a positive locking and/or non-positive locking manner can be exerted onto the machine tool separating device  40  by means of the closure element  12  and the stop face  62 , the clamping face  60  of the closure element  12  is aligned at least substantially parallel to the stop face  62 . 
     The locking element  20  is arranged so as to be movable on the fixing element  16  for locking the fixing element  16 . In this connection, the locking element  20  is realized integrally with the fixing element  16 . For movably arranging the locking element  20  on the fixing element  16 , the locking element  20  is realized as a resilient continuation. The locking unit  18  comprises additionally a further locking element  22  which is arranged so as to be movable on the fixing element  16  for locking the fixing element  16 . Consequently, the locking unit  18  includes at least two locking elements  20 ,  22  which lock the fixing element  16  at least extensively against a movement relative to the closure element  12  in dependence on at least one position of the closure element  12 . However, it is also conceivable for the locking unit  18  to include a number of locking elements  20 ,  22  that deviates from two. The further locking element  22  is also realized integrally with the fixing element  16 . Consequently, the further locking element  22  is also realized as a resilient continuation for movably arranging the further locking element  22  on the fixing element  16 . The locking element  20  and the further locking element  22  comprise an at least substantially analogous development. In this connection, the locking element  20  and the further locking element  22  are arranged on the fixing element in a mirror-symmetrical manner with respect to a plane that extends at least substantially perpendicularly to a movement axis  66  of the fixing element  16 . However, it is also conceivable for the locking element  20  and the further locking element  22  to comprise a different arrangement on the fixing element  16  that appears sensible to an expert, such as, for example, an arrangement that is offset with reference to the movement axis  66  of the fixing element  16  etc. The fixing element  16 , in this connection, is mounted on the closure element  12  so as to be pivotable. Consequently, the movement axis  66  of the fixing element  16  is realized as a pivot axis. The movement axis  66  of the fixing element  16  extends at least substantially parallel to the movement axis  54  of the closure element  12 . 
     In addition, the locking unit  18  includes at least one stop element  24  against which the locking element  20  abuts for locking the fixing element  16  in at least one position of the locking element  20 . The stop element  24  is integrally molded onto the closure element  12  in a region of the movement axis  66  of the fixing element  16 . The locking element  20 , in this connection, abuts against the stop element  24  by way of an end face  68  for locking the fixing element  16  in dependence on a position of the closure element  12 . The locking unit  18  additionally includes at least one further stop element  26 , against which the further locking element  22  abuts for locking the fixing element  16  in at least one position of the further locking element  22 . The further stop element  26  is also integrally molded onto the closure element  12  in a region of the movement axis  66  of the fixing element  16 . The further locking element  22 , in this connection, abuts against the further stop element  26  by way of an end face  70  for locking the fixing element  16  in dependence on a position of the closure element  12 . Consequently, the locking unit  18  includes at least two stop elements  24 ,  26 , against which the locking element  20  or the further locking element  22  abuts for locking the fixing element  16  in at least one position of the locking element  20  or of the further locking element  22 . However, it is also conceivable for the locking unit  18  to include a number of stop elements  24 ,  26  which deviates from two. 
     The stop element  24  and the further stop element  26  are arranged on the closure element  12  in a mirror-symmetrical manner with regard to a plane that extends at least substantially perpendicularly to the movement axis  66  of the fixing element  16 . By means of interaction between the locking element  20  and the further locking element  22  and the stop element  24  and the further stop element  26 , the fixing element  16  is prevented at least extensively from moving in the direction of a locking position of the fixing element  16  in dependence on a position of the closure element  12 . 
     In addition, the fixing element  16  includes at least one stop continuation  72  and a further stop continuation  74  ( FIGS. 2 to 4 ) which are provided for the purpose of defining a movement of the fixing element  16  relative to the closure element  12  in a direction that is opposed to a movement in the direction of the locking position of the fixing element  16 . In this connection, the stop continuation  72  and the further stop continuation  74  in each case interact with a stop face  76 ,  78  of the closure element  12 . 
     In addition, the locking unit  18  includes at least one disengaging element  28  which moves the locking element  20  away from the stop element  24  of the locking unit  18  for mobility or for release of the fixing element  16  for movement. The disengaging element  28  is provided for the purpose of moving the locking element  20  away from the stop element  24  of the locking unit  18  in dependence on a movement of the closure element  12  relative to the basic body  52  for mobility or for release of the fixing element  16  for movement. In this connection, the disengaging element  28  is realized integrally with the basic body  52 . The locking unit  18  additionally comprises a further disengaging element  30  which moves the further locking element  22  away from the further stop element  26  of the locking unit  18  for mobility or for release of the fixing element  16  for movement. The further disengaging element  30  is provided for the purpose of moving the further locking element  22  away from the further stop element  26  of the locking unit  18  in dependence on a movement of the closure element  12  relative to the basic body  52  for mobility or for release of the fixing element  16  for movement. In this connection, the further disengaging element  30  is also realized integrally with the basic body  52 . The disengaging element  28  and the further disengaging element  30  are in each case integrally molded onto the basic body  52  as a continuation. In this connection, the disengaging element  28  and the further disengaging element  30  extend in a direction directed away from the basic body  52  at least substantially perpendicularly to the stop face  62  of the basic body  52 . The disengaging element  28  and the further disengaging element  30  in each case comprise at least one inclined face  32 ,  34  which exerts a force component in the direction of a release position of the locking element  20  or of the further locking element  22  onto the locking element  20  or onto the further locking element  22  as a result of a movement of the closure element  12 . Consequently, the fixing element  16  cannot be moved into a locking position of the fixing element  16  until the locking element  20  and the further locking element  22  are moved by the disengaging element  28  and the further disengaging element  30  into a release position of the locking element  20  and of the further locking element  22  in dependence on a movement of the closure element  12  proceeding from a disengaging position of the closure element  12  into a fixing position of the closure element  12 . 
     For coupling the machine tool separating device  40  with the tool holder  36 , the machine tool separating device  40  is inserted into the receiving recess  56  of the basic body  52 . The closure element  12  is situated, in this connection, in a disengaging position. Consequently, the fixing element  16  is locked at least extensively against a movement relative to the closure element  12  by means of the locking unit  18 . Once the machine tool separating device  40  has been inserted by the operator, proceeding from a disengaging position of the closure element  12 , the closure element  12  is pivoted about the movement axis  54  of the closure element  12  into a fixing position of the closure element  12 . In dependence on the pivot movement of the closure element  12 , a disengaging face  80  of the locking element  20  is moved toward the inclined face  32  of the disengaging element  28  and a disengaging face  82  of the further locking element  22  is moved toward the inclined face  34  of the further disengaging element  30 . As a result of contact between the disengaging face  80  of the locking element  20  and the inclined face  32  of the disengaging element  28  and contact between the disengaging face  82  of the further locking element  22  and the inclined face  34  of the further disengaging element  30 , in each case a force component is exerted in the direction of a release position of the locking element  20  and of the further locking element  22  onto the locking element  20  and the further locking element  22 . As a result of the further movement of the closure element  12  into a fixing position of the closure element  12  and of the contact between the disengaging faces  80 ,  82  and the inclined faces  32 ,  34 , the locking element  20  and the further locking element  22  are moved in each case in a resilient manner in opposite directions into a release position. Consequently, the locking element  20  and the further locking element  22  are forced apart relative to one another ( FIG. 3 ) by means of the disengaging element  28  and the further disengaging element  30 . Once the locking element  20  and the further locking element  22  have been moved in each case into a release position, the fixing element  16  is movable in the direction of a locking position of the fixing element  16 . 
     As a result of a pivot movement of the fixing element  16  about the movement axis  66  of the fixing element  16 , latching regions  84 ,  86  of the fixing element  16  are connected in a positive locking and/or non-positive locking manner to fixing bolts  88 ,  90  of the fixing unit  14 . However, it is also conceivable for the latching regions  84 ,  86  to be connected in a positive locking and/or non-positive locking manner to part regions of a single fixing bolt as a result of a pivot movement of the fixing element  16  about the movement axis  66  of the fixing element  16 . The latching regions  84 ,  86 , when viewed in a plane which extends at least substantially perpendicularly to the movement axis  66  of the fixing element  16 , are realized in an arcuate manner and in each case define an arcuate latching recess. The fixing bolts  88 ,  90  are fixed on the basic body  52 . The fixing element  16 , together with the fixing bolts  88 ,  90 , forms a toggle lever fixing unit which generates a holding force in a manner already known to an expert. Consequently, the fixing unit  14  is provided for the purpose of fixing the closure element  12  in a fixing position of the closure element  12  by means of a positive locking and/or non-positive locking connection. For securing the fixing element  16  in a locking position of the fixing element  16 , the fixing element  16  additionally comprises a retaining continuation  92  ( FIG. 4 ). The retaining continuation interacts in a locking position of the fixing element  16  with a latching continuation  94  of the fixing unit  14  which is integrally molded onto the closure element  12  ( FIG. 3 ). In addition, in a state with the machine tool separating device  40  fixed on the tool holder  36 , cutting train segments of the cutting train  42  engage with the drive element for driving the cutting train  42 . 
     For disengaging the fixing of the closure element  12  in the fixing position of the closure element  12 , the fixing element  16  is pivoted in the direction of the closure element  12 . In this connection, the retaining continuation  92  and the latching continuation  94  over-latch in a manner known to an expert in order to enable a movement of the fixing element  16 . On account of an inner tension in the locking element  20  and in the further locking element  22  as a result of the locking element  20  and the further locking element  22  deforming into a release position, once the fixing has been disengaged, the closure element  12  is moved slightly about the movement axis  54  in the direction of a disengaging position of the closure element  12 . Consequently, the locking element  20  and the further locking element  22  are moved automatically into a locking position on account of the pivot movement of the fixing element  16  up until the stop continuations  72 ,  74  strike against the stop faces  76 ,  78  and on account of the inner tension of the locking element  20  and of the further locking element  22 . Consequently, the locking element  20  and the further locking element  22  abut once again against the stop element  24  and the further stop element  26  and lock the fixing element  16  at least extensively against a movement relative to the closure element  12 .