EP3815843A1 - Tensioning device for tensioning a workpiece - Google Patents

Abstract

To a clamping device for clamping a workpiece, comprising a housing, a clamping arm pivotably held on the housing and a clamping screw which is rotatably mounted about a longitudinal axis of the clamping screw, the clamping screw having a thread and the clamping arm having an engagement section which in a working state the clamping device is in engagement with the thread of the clamping screw, in which the clamping arm can be moved as quickly as possible from a first working position relative to the housing of the clamping device into a second working position relative to the housing of the clamping device, it is proposed that the clamping device have a Decoupling device comprises, by means of which the thread of the clamping screw can be brought out of engagement with the engagement portion of the clamping arm, so that the clamping arm is independent of a rotation of the clamping screw relative to the housing of the clamping device between a first working position and a z wide working position is pivotable.

Description

The present invention relates to a clamping device for clamping a workpiece, the clamping device comprising a housing, a clamping arm pivotably held on the housing and a clamping screw which is mounted rotatably about a longitudinal axis of the clamping screw,
wherein the tensioning screw has a thread and the tensioning arm has an engagement section which, in a working state of the tensioning device, is in engagement with the thread of the tensioning screw.

In known clamping devices of this type, the clamping arm is moved from a first working position into a second working position in that the clamping screw is rotated about its longitudinal axis. This rotation of the tensioning screw causes the tensioning arm to pivot due to the engagement of the thread of the tensioning screw with the engagement section of the tensioning arm.

If the difference angle between the first working position and the second working position of the tensioning arm is large, a large number of turns of the tensioning screw are required to move the tensioning arm from the first working position into the second working position.

The present invention is based on the object of creating a clamping device of the aforementioned type in which the clamping arm can be moved as quickly as possible from a first working position relative to the housing of the clamping device into a second working position relative to the housing of the clamping device.

This object is achieved according to the invention in a tensioning device with the features of the preamble of claim 1 in that the tensioning device comprises a decoupling device by means of which the thread of the tensioning screw disengages from the engagement section of the tensioning arm can be brought so that the clamping arm can be pivoted between a first working position and a second working position independently of a rotation of the clamping screw relative to the housing of the clamping device.

In order to be able to move the clamping arm as quickly as possible from a first working position relative to the housing of the clamping device into a second working position relative to the housing of the clamping device, it can be provided that the clamping device comprises a decoupling device by means of which the thread of the clamping screw disengages from the Engagement portion of the tensioning arm can be brought so that the tensioning arm can be pivoted between a first working position and a second working position independently of a rotation of the tensioning screw relative to the housing of the tensioning device.

Such a decoupling device can in particular comprise a guide element which receives a guide section of the tensioning screw and is movable, in particular displaceable, between an engagement position in which the tensioning screw is in engagement with the tensioning arm and a release position in which the tensioning screw is out of engagement with the tensioning arm , is.

The decoupling device can in particular comprise a pretensioning device which pretensions the guide element into the engagement position.

As an alternative or in addition to this, the decoupling device can comprise a latching device, by means of which the guide element can be latched in the engagement position and / or in the release position - preferably on the housing of the clamping device.

The latching device can comprise at least one latching part that between a latching position in which the latching part locks the guide element in the engagement position and / or in the release position, and a disengaging position, in which the latching part releases a movement of the guide element from the engagement position into the release position and / or from the release position into the engagement position, is movable.

In particular, the latching device can comprise a spring element which biases the at least one latching part into the latching position.

In a particular embodiment of the latching device, it is provided that the latching device comprises two latching parts which protrude in opposite directions from the housing of the clamping device.

The latching part or at least one of the latching parts can be provided with an actuating element on which an operator can act in order to move the latching part into the unlatched position.

The latching part or at least one of the latching parts is preferably guided displaceably in a guide channel of the guide element.

The clamping screw preferably comprises an actuating end part on which a screwing tool can act in order to rotate the clamping screw about its longitudinal axis.

The actuating end part can in particular be designed as a tensioning screw head.

The actuating end part can have a polygonal cross-section, in particular a hexagonal cross-section, taken perpendicular to the longitudinal axis of the clamping screw.

Furthermore, it can be provided that the actuating end part is provided with a recess with a polygonal cross section, in particular with a hexagonal cross section.

The clamping screw can have a bearing end part, by means of which the clamping screw is pivotably mounted relative to the housing - preferably on the housing.

The bearing end part can have a partially spherical bearing section, which is arranged on a bearing receptacle of the housing of the clamping device, which is designed to be complementary in sections.

The tensioning arm is preferably pivotable by an angle of at least 30 °, in particular at least 45 °, particularly preferably at least 60 °, relative to the housing of the tensioning device when the thread of the tensioning screw is out of engagement with the engagement section of the tensioning arm.

The clamping device can comprise at least one chip protection element, which at least partially covers an intermediate space between two opposing inner walls of the housing of the clamping device.

In particular, the clamping device can comprise an upper chip protection element, which is arranged on a side of the clamping arm facing away from the support surface of the clamping device, and / or a lower chip protection element, which is arranged on a side of the clamping arm facing the support surface of the clamping device.

In order to prevent chips or other impurities from getting between a chip protection element and the clamping arm into an interior of the housing of the clamping device, it is advantageous if at least one Chip protection element has an edge portion which rests against the tensioning arm or is spaced from the tensioning arm by less than 2 mm, in particular by less than 1 mm.

In a particular embodiment of the clamping device according to the invention, the clamping device further comprises a fastening means for fastening the clamping device to a substrate and a fastening means receptacle in which the fastening means can be received.

In order to be able to carry out the fastening of the clamping device on a substrate in a particularly simple and easy manner, it is advantageous if
the clamping arm has at least one recess which is designed and arranged on the clamping arm in such a way that an actuating tool engaging the fastening means for actuating the fastening means can extend in at least one working position of the clamping arm relative to the housing through the recess to the fastening means,
and or
the tensioning arm has at least one bend which is designed and arranged on the tensioning arm in such a way that an actuating tool engaging the fastening means for actuating the fastening means in at least one working position of the tensioning arm relative to the housing laterally past the cranked area of the tensioning arm up to the Fastening means can extend.

The fastening means is arranged in the fastening means receptacle of the tensioning device when the actuating tool engages the fastening means and extends through the recess of the tensioning arm or laterally past the cranked area of the tensioning arm to the fastening means.

In a preferred embodiment of the invention, it is provided that the clamping arm can be pivoted between a first working position and a second working position relative to the housing and the recess or the bend is designed so that the actuating tool is in the first working position as well as in the second Working position can extend through the recess or laterally past the angled area of the clamping arm to the fastening means.

In the second working position, the tensioning arm is pivoted by an angle of preferably at least 30 °, in particular at least 40 °, particularly preferably at least 60 °, with respect to the first working position relative to the housing of the tensioning device.

It is particularly advantageous if the recess or the bend is designed so that the actuating tool moves through the recess or laterally past the bent area of the tension arm in each position of the tensioning arm relative to the housing between the first working position and the second working position can extend up to the fastening means.

The at least one recess can in particular be designed as a passage opening in the tensioning arm.

Such a passage opening preferably extends from an upper side of the tensioning arm facing away from the fastening means receptacle to an underside of the tensioning arm facing the fastening means receptacle through the tensioning arm.

The recess can in particular be designed as an elongated hole in order to enable the actuating tool to extend in a multiplicity of working positions through the recess designed as an elongated hole to the fastening means.

In a particular embodiment of the clamping device according to the invention, it is provided that the clamping arm has at least one first recess and one second recess and can be pivoted between a first working position and a second working position relative to the housing, the first recess being designed so that the actuating tool can can extend in the first working position through the first recess up to the fastening means and the second recess is designed such that the actuating tool can extend in the second working position through the second recess up to the fastening means.

Furthermore, it can be provided that the tensioning arm has more than two recesses through which the actuating tool can extend to the fastening means when the tensioning arm is in different working positions.

At least two of the recesses in the tensioning arm can be designed in such a way that they open at a common mouth opening on the underside of the tensioning arm facing the fastening means receptacle.

In order to be able to set a desired working position of the clamping arm relative to the housing of the clamping device as precisely as possible, it is advantageous if the clamping device comprises at least one working position scale, which is arranged on the housing or on a component of the clamping device connected non-rotatably to the housing, and a Includes index marking which is arranged on the tensioning arm or on a component of the tensioning device that is non-rotatably connected to the tensioning arm, wherein a predetermined positioning of the index mark relative to the working position scale is assigned to several working positions of the tensioning arm relative to the housing.

In particular, it can be provided that the working position scale comprises several working position markings, which are assigned different working positions of the tensioning arm relative to the housing.

In a special embodiment of the invention it is provided that the clamping arm is provided with a pressure piece and the heights H of the pressure piece in relation to a support surface of the housing of the clamping device, which the pressure piece assumes in the various working positions to which the working position markings are assigned, form an essentially equidistant sequence.

One of the working position markings on the working position scale can be an upper end position marking which is assigned to the working position in which the height H _{o of} the pressure piece is at a maximum in relation to the bearing surface of the housing.

Furthermore, one of the working position markings can be a lower end position marking which is assigned to the working position in which the height H _{u of} the pressure piece is minimal in relation to the bearing surface of the housing.

At least one working position scale is preferably provided on two different sides of the clamping device housing so that the positioning of the clamping arm relative to the clamping device housing can be easily read from two opposite sides of the clamping device.

In a special embodiment of the clamping device according to the invention, it is provided that at least one of the working position scales is arranged on an outer edge of the housing.

As an alternative or in addition to this, it can be provided that at least one of the working position scales is arranged on an inner edge of the housing which is opposite an edge of a bearing section of the tensioning arm.

With the bearing section, the tensioning arm is preferably mounted on a boundary wall of the housing of the tensioning device so as to be pivotable about a pivot axis of the tensioning arm.

The tensioning arm is preferably provided with a pressure piece which comprises a pressure piece main body and a pressure piece insert which is detachably connected to the pressure piece main body.

The pressure piece main body is preferably held captive on the clamping arm.

The pressure piece insert is preferably connected to the pressure piece main body such that it can be exchanged for another pressure piece insert.

In a special embodiment of a pressure piece insert, the pressure piece insert can have an essentially flat clamping surface with which the pressure piece can be placed against a workpiece to be clamped.

In a special embodiment of a pressure piece insert, the pressure piece insert can comprise a clamping surface which is provided with one or more grooves in order to produce a corrugation or profiling of the clamping surface.

In a special embodiment of a pressure piece insert it can be provided that the pressure piece insert has a recess with which the workpiece can come into engagement when the workpiece is clamped.

Such a recess can extend, for example, in a longitudinal direction or in a transverse direction of the clamping device.

The recess can have a cross section - taken perpendicular to its longitudinal direction - which is preferably triangular or trapezoidal.

In a special embodiment of the clamping device, it is provided that the pressure piece insert is detachably connected to the pressure piece base body by means of a magnetic element.

The magnetic element preferably comprises a permanent magnet.

The magnetic element can be arranged on the pressure piece main body or on the pressure piece insert.

The pressure piece base body is preferably provided with a projection, the underside of which, facing away from a pressure piece pivot axis of the clamping device, can serve as a clamping surface for a workpiece to be clamped by means of the clamping device if no pressure piece insert is arranged on the pressure piece base body.

The pressure piece insert can have a recess into which the projection of the pressure piece main body engages when the pressure piece insert is arranged on the pressure piece main body.

The recess is preferably designed to be complementary to the projection, so that the projection and the recess together form a form fit, which prevents displacement of the pressure piece insert relative to the pressure piece main body in a direction parallel to the underside of the pressure piece main body.

The clamping device according to the invention is particularly suitable for use in a combination of a clamping device according to the invention and an actuating tool for actuating a fastening means for fastening the clamping device to a substrate.

The actuating tool can have a substantially rectilinear tool section which extends from the recess or from the angled region of the clamping arm to the fastening means when the actuating tool is used to actuate the fastening means.

In particular, it can be provided that the actuating tool is designed as an Allen key.

In this case, the fastening means preferably comprises a hexagon socket screw.

Further features and advantages of the invention are the subject matter of the following description and the graphic representation of an exemplary embodiment.

Fig. 1

eine perspektivische Darstellung einer Spannvorrichtung zum Einspannen eines Werkstücks, welche ein Gehäuse, einen schwenkbar an dem Gehäuse gehaltenen Spannarm und eine Spannschraube umfasst, wobei der Spannarm sich in einer oberen Endstellung befindet;

Fig. 2

eine Seitenansicht der Spannvorrichtung aus Fig. 1;

Fig. 3

eine Draufsicht auf die Spannvorrichtung aus den Fig. 1 und 2, mit der Blickrichtung in Richtung des Pfeiles 3 in Fig. 2;

Fig. 4

eine Draufsicht auf die Spannvorrichtung aus den Fig. 1 bis 3 von unten, mit der Blickrichtung in Richtung des Pfeiles 4 in Fig. 2;

Fig. 5

eine Vorderansicht der Spannvorrichtung aus den Fig. 1 bis 4, mit der Blickrichtung in Richtung des Pfeiles 5 in Fig. 2;

Fig. 6

eine Ansicht der Spannvorrichtung aus den Fig. 1 bis 5 von hinten, mit der Blickrichtung in Richtung des Pfeiles 6 in Fig. 2;

Fig. 7

einen Längsschnitt durch die Spannvorrichtung aus den Fig. 1 bis 6, längs der Linie 7 - 7 in Fig. 3, wobei der Spannarm sich in seiner oberen Endstellung befindet und ein Eingriffsabschnitt des Spannarms in Eingriff mit einem Gewinde der Spannschraube steht;

Fig. 8

einen Längsschnitt durch die Spannvorrichtung aus den Fig. 1 bis 7, längs der Linie 8 - 8 in Fig. 2, wobei ein Führungselement einer Entkopplungsvorrichtung der Spannvorrichtung sich in einer Eingriffstellung befindet, in welcher die Spannschraube in Eingriff mit dem Spannarm steht, und Verrastungsteile einer Rastvorrichtung der Entkopplungsvorrichtung sich in einer Raststellung befinden, in welcher die Verrastungsteile das Führungselement in der Eingriffstellung arretieren;

Fig. 9

einen der Fig. 8 entsprechenden Längsschnitt durch die Spannvorrichtung, wobei das Führungselement sich in der Eingriffstellung befindet und die Verrastungsteile in eine Entrastungsstellung bewegt worden sind, in welcher die Verrastungsteile eine Bewegung des Führungselements von der Eingriffstellung in eine Freigabestellung, in welcher die Spannschraube außer Eingriff mit dem Spannarm ist, freigeben;

Fig. 10

einen den Fig. 8 und 9 entsprechenden Längsschnitt durch die Spannvorrichtung, wobei das Führungselement von der Eingriffstellung in die Freigabestellung bewegt worden ist und wobei die Verrastungsteile sich in der Entrastungsstellung befinden, in welcher die Verrastungsteile eine Bewegung des Führungselements von der Freigabestellung in die Eingriffstellung freigeben;

Fig. 11

eine Draufsicht von oben auf die Spannvorrichtung aus den Fig. 1 bis 10, wobei der Spannarm sich in seiner oberen Endstellung befindet, das Führungselement sich in der Freigabestellung befindet und die Verrastungsteile sich in der Entrastungsstellung befinden;

Fig. 12

einen Querschnitt durch die Spannvorrichtung im Bereich der Rastvorrichtung, längs der Linie 12 - 12 in Fig. 11, wobei die Verrastungsteile der Rastvorrichtung sich in der Entrastungsstellung befinden, in welcher die Verrastungsteile eine Bewegung des Führungselements von der Freigabestellung in die Eingriffstellung freigeben;

Fig. 13

einen der Fig. 12 entsprechenden Querschnitt durch die Spannvorrichtung, wobei die Verrastungsteile von der Entrastungsstellung in die Raststellung bewegt worden sind, in welcher die Verrastungsteile das Führungselement in der Freigabestellung arretieren;

Fig. 14

einen den Fig. 8 bis 10 entsprechenden Längsschnitt durch die Spannvorrichtung, wobei das Führungselement sich in der Freigabestellung befindet und die Verrastungsteile sich in der Raststellung befinden;

Fig. 15

einen der Fig. 7 entsprechenden Längsschnitt durch die Spannvorrichtung, wobei der Spannarm sich in seiner oberen Endstellung befindet, das Führungselement sich in der Freigabestellung befindet und das Gewinde der Spannschraube außer Eingriff mit dem Eingriffsabschnitt des Spannarms ist;

Fig. 16

einen der Fig. 15 entsprechenden Längsschnitt durch die Spannvorrichtung, wobei der Spannarm in seine untere Endstellung bewegt worden ist und das Führungselement sich in der Eingriffstellung befindet, so dass das Gewinde der Spannschraube in Eingriff mit dem Eingriffsabschnitt des Spannarms steht;

Fig. 17

eine perspektivische Darstellung der Spannvorrichtung aus den Fig. 1 bis 16, eines Befestigungsmittels und eines Betätigungswerkzeugs zum Betätigen des Befestigungsmittels, welches sich seitlich an einem abgekröpften Bereichs des Spannarms vorbei bis zu dem Befestigungsmittel erstreckt, wobei der Spannarm sich in seiner oberen Endstellung befindet;

Fig. 18

eine Seitenansicht der Spannvorrichtung, des Befestigungsmittels und des Betätigungswerkzeugs aus Fig. 17;

Fig. 19

einen Längsschnitt durch die Spannvorrichtung, das Befestigungsmittel und das Betätigungswerkzeug aus den Fig. 17 und 18;

Fig. 20

eine perspektivische Darstellung der Spannvorrichtung, des Befestigungsmittels und des Betätigungswerkzeugs aus den Fig. 17 bis 19, wobei der Spannarm sich in seiner unteren Endstellung befindet;

Fig. 21

eine Seitenansicht der Spannvorrichtung, des Befestigungsmittels und des Betätigungswerkzeugs aus Fig. 20;

Fig. 22

einen Längsschnitt durch die Spannvorrichtung, das Befestigungsmittel und das Betätigungswerkzeug aus den Fig. 20 und 21.

Fig. 23

eine perspektivische Darstellung des freien Endbereichs des Spannarms, eines Druckstück-Grundkörpers und mehrerer austauschbarer Druckstück-Einsätze bei einer Variante der Spannvorrichtung;

Fig. 24

eine Seitenansicht des freien Endbereichs des Spannarms, des Druckstück-Grundkörpers und der Druckstück-Einsätze aus Fig. 23, mit der Blickrichtung in Richtung einer Druckstück-Schwenkachse der Spannvorrichtung;

Fig. 25

einen Längsschnitt durch den freien Endbereich des Spannarms, den Druckstück-Grundkörper und die Druckstück-Einsätze aus Fig. 24;

Fig. 26

eine Vorderansicht des freien Endbereichs des Spannarms, des Druckstück-Grundkörpers und der Druckstück-Einsätze aus den Fig. 23 bis 25, mit der Blickrichtung senkrecht zu der Druckstück-Schwenkachse und parallel zur Längsrichtung der Spannvorrichtung; und

Fig. 27

einen Querschnitt durch den freien Endbereich des Spannarms, den Druckstück-Grundkörper und die Druckstück-Einsätze aus Fig. 26.

In the drawings show:

Fig. 1

a perspective view of a clamping device for clamping a workpiece, which has a housing, a comprises a tensioning arm pivotably held on the housing and a tensioning screw, the tensioning arm being in an upper end position;

Fig. 2

a side view of the jig from Fig. 1 ;

Fig. 3

a plan view of the jig from FIG Fig. 1 and 2 , looking in the direction of arrow 3 in Fig. 2 ;

Fig. 4

a plan view of the jig from FIG Figs. 1 to 3 from below, looking in the direction of arrow 4 in Fig. 2 ;

Fig. 5

a front view of the jig from FIG Figs. 1 to 4 , looking in the direction of arrow 5 in Fig. 2 ;

Fig. 6

a view of the jig from the Figs. 1 to 5 from behind, looking in the direction of arrow 6 in Fig. 2 ;

Fig. 7

a longitudinal section through the jig from the Figures 1 to 6 , along the line 7-7 in Fig. 3 wherein the tensioning arm is in its upper end position and an engagement portion of the tensioning arm is in engagement with a thread of the tensioning screw;

Fig. 8

a longitudinal section through the jig from the Figures 1 to 7 , along line 8-8 in Fig. 2 , wherein a guide element of a decoupling device of the clamping device is in an engagement position in which the clamping screw is in engagement with the clamping arm, and latching parts of a latching device of the decoupling device are in a latching position in which the latching parts lock the guide element in the engaged position;

Fig. 9

one of the Fig. 8 corresponding longitudinal section through the clamping device, wherein the guide element is in the engaged position and the locking parts have been moved into a disengaging position in which the locking parts cause a movement of the guide element from the engaged position into a release position in which the clamping screw is out of engagement with the clamping arm, release;

Fig. 10

one the Fig. 8 and 9 corresponding longitudinal section through the clamping device, wherein the guide element has been moved from the engagement position into the release position and wherein the locking parts are in the unlocking position, in which the locking parts release a movement of the guide element from the release position into the engagement position;

Fig. 11

a plan view from above of the jig from FIG Figures 1 to 10 , wherein the clamping arm is in its upper end position, the guide element is in the release position and the locking parts are in the unlocking position;

Fig. 12

a cross section through the tensioning device in the region of the locking device, along the line 12-12 in FIG Fig. 11 wherein the locking parts of the locking device are in the unlocking position, in which the locking parts release a movement of the guide element from the release position into the engagement position;

Fig. 13

one of the Fig. 12 corresponding cross-section through the clamping device, wherein the locking parts have been moved from the unlocking position into the locking position in which the locking parts lock the guide element in the release position;

Fig. 14

one the Figures 8-10 corresponding longitudinal section through the clamping device, the guide element being in the release position and the latching parts being in the latching position;

Fig. 15

one of the Fig. 7 corresponding longitudinal section through the tensioning device, wherein the tensioning arm is in its upper end position, the guide element is in the release position and the thread of the tensioning screw is out of engagement with the engagement portion of the tensioning arm;

Fig. 16

one of the Fig. 15 corresponding longitudinal section through the clamping device, wherein the clamping arm has been moved into its lower end position and the guide element is in the engagement position, so that the thread of the clamping screw is in engagement with the engagement section of the clamping arm;

Fig. 17

a perspective view of the clamping device from FIG Figures 1 to 16 , a fastening means and an operating tool for operating the fastening means, which extends laterally past a cranked area of the tensioning arm up to the fastening means, wherein the tensioning arm is in its upper end position;

Fig. 18

a side view of the clamping device, the fastening means and the operating tool Fig. 17 ;

Fig. 19

a longitudinal section through the clamping device, the fastening means and the operating tool from the Fig. 17 and 18th ;

Fig. 20

a perspective view of the clamping device, the fastening means and the operating tool from FIG Figures 17 to 19 , wherein the tension arm is in its lower end position;

Fig. 21

a side view of the clamping device, the fastening means and the operating tool Fig. 20 ;

Fig. 22

a longitudinal section through the clamping device, the fastening means and the operating tool from the Fig. 20 and 21st .

Fig. 23

a perspective view of the free end region of the tensioning arm, a pressure piece base body and several exchangeable pressure piece inserts in a variant of the tensioning device;

Fig. 24

a side view of the free end region of the clamping arm, the pressure piece base body and the pressure piece inserts Fig. 23 , with the viewing direction in the direction of a pressure piece pivot axis of the clamping device;

Fig. 25

a longitudinal section through the free end area of the clamping arm, the pressure piece base body and the pressure piece inserts Fig. 24 ;

Fig. 26

a front view of the free end of the tension arm, the pressure piece base body and the pressure piece inserts from the Figures 23 to 25 , with the viewing direction perpendicular to the pressure piece pivot axis and parallel to the longitudinal direction of the clamping device; and

Fig. 27

a cross section through the free end area of the tension arm, the pressure piece base body and the pressure piece inserts Fig. 26 .

Identical or functionally equivalent elements are denoted by the same reference symbols in all figures.

One in the Figs. 1 to 22 The clamping device 100 shown is used to clamp a workpiece 102 on a clamping surface 104, which can, for example, be coplanar with a support surface 106 of a housing 108 of the clamping device 100, but also offset upwards or downwards with respect to this support surface 106 and / or inclined with respect to the support surface 106 can be.

How best from the Fig. 3 , 4th and 6th As can be seen, the housing 108 is preferably designed in two parts and comprises a first housing part 110a and a second housing part 110b, which preferably abut one another in a contact plane 112 which is parallel to a longitudinal direction 114 of the clamping device 100 and perpendicular to a transverse direction 116 of the clamping device 100 is aligned.

The longitudinal direction 114 and / or the transverse direction 116 are preferably aligned parallel to the support surface 106 of the housing 108.

A height direction 118 of the clamping device 100 is oriented perpendicular to the longitudinal direction 114 and perpendicular to the transverse direction 116 and thus also perpendicular to the support surface 106 of the housing 108 of the clamping device 100.

The two housing parts 110a and 110b are fixed to one another, preferably detachably, by means of one or more, for example three, fastening elements 120.

The fastening elements 120 can, for example, each be designed as a screw which penetrates a passage opening in one housing part, for example in the second housing part 110b, and with its thread (not shown) in a complementary internal thread on the other housing part, for example on the first Housing part 110a, is screwed.

As best seen from the top view of the underside of the jig 100 in FIG Fig. 4 As can be seen, the housing 108 is provided on its front edge 122 with a fastening means receptacle 124, for example essentially U-shaped, which serves to accommodate a fastening means for fastening the clamping device 100 to a substrate 126.

Such a fastening means 128 can comprise, for example, a fastening screw 130 and a T-slot piece 132, the fastening screw 130 being screwed with its external thread into an internal thread of the T-slot piece 132 complementary thereto (see FIG Figures 17 to 22 ).

The base 126, to which the clamping device can be fastened by means of the fastening means 128, can be designed, for example, as a machine table, as a workpiece pallet or as a base element on which the clamping device 100 is placed in order to move the support surface 106 by the height of the base element from the Clamping surface 104 to be spaced.

As best from the sectional view of Fig. 7 As can be seen, the tensioning device 100 further comprises a tensioning arm 136 which is held on the housing 108 so as to be pivotable about a pivot axis 134.

The pivot axis 134 of the tensioning arm 136 is aligned parallel to the transverse direction 116 of the tensioning device 100.

The tensioning arm 136 comprises a clamping section 138, which extends through an outlet opening 140, bordered by the housing parts 110a and 110b, on the front side of the housing 108 into an outer space 142 of the housing 108.

On a free end region 144 of the clamping arm 136 facing away from the pivot axis 134, a pressure piece 146 is arranged, which serves to transmit a clamping force from the clamping device to the workpiece 102 to be clamped.

The pressure piece 146 is preferably articulated on the tensioning arm 136 so as to be pivotable about a pressure piece pivot axis 148 relative to the free end region 144 of the tensioning arm 136.

The pressure piece 146 can be formed in one piece.

As an alternative to this, the pressure piece 146 preferably comprises a pressure piece base body 150, which is connected to the tensioning arm 136, and a pressure piece insert 152 which is detachably connected to the pressure piece base body 150 (see FIG Fig. 1 ).

The pressure piece insert 152 is preferably connected to the pressure piece main body 150 by a form fit.

In particular, it can be provided that the pressure piece insert 152 is detachably fixed on the pressure piece base body 150 by means of a tongue and groove connection.

Due to the releasable connection between the pressure piece insert 152 and the pressure piece main body 150, it is possible to replace the pressure piece insert 152 with a differently designed further pressure piece insert.

As an alternative or in addition to a releasable connection between the pressure piece insert 152 and the pressure piece base body 150 by means of a tongue and groove connection, it can be provided that the pressure piece insert 152 'is detachably connected to the pressure piece base body 150 by means of a magnetic element 310 .

Such a variant of the pressure piece 146 is in the Figures 23 to 27 shown.

In this embodiment, the pressure piece main body 150 preferably has a projection 312 on its underside facing away from the pressure piece pivot axis 148, the underside 314 of which can serve as a clamping surface 290 for clamping a workpiece 102 by means of the clamping device 100 if there is no pressure piece insert 152 ' the pressure piece main body 150 is arranged.

The clamping surface 290 can be designed to be essentially flat and, when the clamping device 100 is used for clamping a workpiece 102, can rest against the workpiece 102.

The pressure piece insert 152 'preferably has a recess 316 into which the projection 312 of the pressure piece main body 150 engages when the pressure piece insert 152' is arranged on the pressure piece main body 150.

The recess 316 is preferably designed to be complementary to the projection 312, so that the pressure piece insert 152 ′ is secured against displacement relative to the pressure piece base body 150 in directions parallel to the underside 314 of the projection 312 when the pressure piece insert 152 'Is arranged on the pressure piece main body 150.

The magnetic element 310, which produces a non-positive connection between the pressure piece insert 152 'and the pressure piece main body 150, is arranged on the pressure piece insert 152' in the embodiment shown in the drawing.

In principle, however, it could also be provided that the magnetic element 310 is arranged on the pressure piece main body 150; in this case it is not necessary to provide the pressure piece inserts 152 'with a magnetic element 310 as well.

The first pressure piece insert 152b 'is provided with one or more grooves 292 on the clamping surface 290 facing away from the pressure piece base body 150 in the assembled state of the pressure piece insert 152b', through which the clamping surface 290 is profiled so that the pressure piece insert 152b 'can dig into the workpiece 102 to be clamped with its clamping surface 290 in order to increase the adhesion between the pressure piece 146 and the workpiece 102 to be clamped.

As shown in the drawing, the grooves 292 can run parallel to the transverse direction 116 of the clamping device 100 (and thus parallel to the pressure piece pivot axis 148) or run parallel to the longitudinal direction 114 of the clamping device 100 or run in any other direction.

In the second pressure piece insert 152c ', a recess 294 is provided on the clamping surface 290 facing away from the pressure piece base body 150 in the assembled state of the pressure piece insert 152c', which extends in the transverse direction 116 of the clamping device 100 and perpendicular to this, preferably a trapezoidal or Has triangular cross-section.

In the third pressure piece insert 152d ', the clamping surface 290 facing away from the pressure piece base body 150 in the assembled state of the pressure piece insert 152d' is provided with a recess 294 'which extends parallel to the longitudinal direction 114 of the clamping device 100 and perpendicular to this direction preferably has a trapezoidal or triangular cross-section.

Through the recess 294 or 294 'of the second pressure piece insert 152c' or the fourth pressure piece insert 152d ', a particularly good transmission of force from the pressure piece 146 to a workpiece 102 can be achieved, which is at least partially complementary to the respective recess 294 or 294'. having formed workpiece portion.

Incidentally, it is correct in the Figures 23 to 27 Variant of the clamping device shown in terms of structure, method of manufacture and function with that in the Figs. 1 to 22 The basic version of the clamping device shown corresponds to the preceding and following description of which reference is made in this respect.

As best seen from the side view of the tensioner 100 in FIG Fig. 2 As can be seen, the clamping device 100 comprises a working position scale 154, which is arranged on the housing 108 of the clamping device 100, and an index marking 156 which interacts with the working position scale 154 and which is arranged on the clamping arm 136.

The index marking 156 preferably extends in a direction directed radially to the pivot axis 134 of the tensioning arm 136.

The index marking 156 can be embodied, for example, as a depression or as an elevation on the tensioning arm 136.

As an alternative to this, provision can be made for the index marking 156 to stand out from the surrounding area of the tensioning arm 136 by its color and / or its brightness.

The working position scale 154 preferably comprises several working position markings 158 which are assigned to different working positions of the clamping arm 136 relative to the housing 108 of the clamping device 100, the clamping arm 136 being rotated in these different working positions by different angles relative to the housing 108 about the pivot axis 134.

In the embodiment shown in the drawing, the working position scale 154 comprises, for example, five such working position markings 158; as an alternative to this, however, it can also be provided that the working position scale 154 comprises only one, two, three, four or more than five working position markings 158.

The working position markings 158 preferably extend in a direction directed radially to the pivot axis 134.

The work position markings 158 can in particular be embodied as elevations or recesses on the housing 108.

As an alternative or in addition to this, it is possible for the working position markings 158 to stand out from the area of the housing 108 adjoining the working position markings 158 by their color and / or by their brightness.

In the embodiment of a clamping device 100 shown here in the drawing, two working position scales 154 are provided, one of the working position scales 154 being arranged on the first housing part 110a and a second working position scale 154 being arranged on the second housing part 110b.

Correspondingly, two index marks 156 are also provided on the tensioning arm 136, a first index marking 156a being arranged on the side of the tensioning arm 136 facing the first working position scale 154a and the second index marking being arranged on the side of the tensioning arm 136 facing the second working position scale 154.

The fact that there is a working position scale 154 cooperating with an index mark 156 of the clamping arm 136 on each side of the clamping arm 136 means that the respective working position of the clamping arm 136 can be read easily and reliably from both sides of the clamping device 100.

Preferably, one of the working position markings 158 of the working position scale 154 is an upper end position marking 160a, which is assigned to the working position of the clamping arm 136, at which the height H _{o of} the pressure piece pivot axis 148 in relation to the support surface 106 of the housing 108 of the clamping device 100 is maximum.

In Fig. 7 the clamping arm 136 is in this upper end position.

Furthermore, one of the working position markings 158 of the working position scale 154 is preferably a lower end position marking 160b, which is assigned to the working position of the tensioning arm 136, in which the height H _{u of} the pressure piece pivot axis 148 in relation to the bearing surface 106 of the housing 108 is minimal.

In Fig. 16 the clamping arm 136 is in this lower end position.

The intermediate position markings 162a, 162b and 162c of the working position scale 154, which lie between the upper end position marking 160a and the lower end position marking 160b, are preferably arranged on the housing 108 in such a way that the heights H ₁ , H ₂ , H ₃ and H _{u of} the pressure piece pivot axis 148 in With reference to the support surface 106 of the housing 108 of the clamping device 100, which the pressure piece pivot axis 148 in the various intermediate positions of the clamping arm 136, to which the intermediate position markings 162a, 162b and 162c are assigned, or in the lower end position of the clamping arm 136, which is the lower end position marking 160b is assigned, each occupies, form a substantially equidistant sequence.

The intermediate position markings 162a, 162b and 162c are therefore preferably so arranged relative to the upper end position mark 160a and the lower end position mark 160b that the height H ₁ , which the pressure piece pivot axis 148 assumes in the first intermediate position assigned to the first intermediate position mark 162a, is lower by ΔH is than the height H _o which the pressure piece pivot axis 148 assumes in the upper end position of the tensioning arm 136.

Furthermore, the height H ₂ , which the pressure piece pivot axis 148 assumes in the second intermediate position assigned to the second intermediate position marking 162b, is smaller by ΔH than the height H ₁ .

The height H ₃ , which the pressure piece pivot axis 148 assumes in the third intermediate position assigned to the third intermediate position marking 162c, is smaller by ΔH than the height H ₂ .

The height H _u , which the pressure piece pivot axis 148 assumes in the lower end position, is smaller by ΔH than the height H ₃ .

In the illustrated embodiment, in which three intermediate position markings 162a, 162b and 162c are provided, $$\mathrm{\Delta H}=\left({\mathrm{H}}_{\mathrm{O}}-{\mathrm{H}}_{\mathrm{u}}\right)/\mathrm{4th}$$

If the working position scale 154 comprises n intermediate position markings 162, then the following generally applies: ΔH = (H _o − H _u ) / (n + 1).

The angle of rotation with respect to the pivot axis 134 of the tensioning arm 136, by which the positions of immediately successive work position markings 158 of the work position scale 154 differ from one another, is therefore not constant, but decreases from the upper end position marking 160a to the lower end position marking 160b.

In the embodiment of a clamping device 100 shown in the drawing, the working position scale 154 is arranged on an outer edge 164 of the housing 108 of the clamping device, and the working position markings 158 are each formed as recesses, in particular as notches, on the relevant outer edge 164.

In order to be able to pivot the clamping arm 136 about the pivot axis 134 into the desired working position, which does not have to coincide with the upper end position or the lower end position or one of the intermediate positions described above, which are each assigned to a working position marking 158, but can lie between these positions , the clamping device 100 comprises a movement device designated as a whole by 166, which comprises a clamping screw 168 which is mounted rotatably about a longitudinal axis 170 of the clamping screw 168 (see FIG Fig. 7 ).

The clamping screw 168 has a thread 172, which in the in Fig. 7 working condition shown and in the in Fig. 16 The working state of the clamping device 100 shown here is in engagement with a ring gear segment 174 which is formed on an engagement section 176 of the clamping arm 136.

The engagement section 176 of the tensioning arm 136 is arranged on the side of the pivot axis 134 of the tensioning arm 136 facing away from the free end region 144 of the tensioning arm 136.

The clamping screw 168 further comprises a bearing end part 178, by means of which the clamping screw 168 is mounted pivotably relative to the housing 108.

The bearing end part 178 is releasably fixed to an end region 184 of a shaft 186 of the clamping screw 168 by means of a fastening screw 182.

The thread 172 of the tensioning screw 168 is formed on the shaft 186 of the tensioning screw 168.

An annular stop 187 is arranged between the thread 172 and the bearing end part 178, which prevents the clamping screw 168 from moving downwards along its longitudinal axis 170 when it is not in engagement with the engagement section 176 of the clamping arm 136.

The bearing end part 178 comprises a bearing section 180, which has an outer contour that is configured spherically in sections.

The partially spherical bearing section 180 of the clamping screw 168 is arranged in a partially complementary bearing receptacle 188 of the housing 108 of the clamping device 100, so that the clamping screw 168 along the partially spherical contact surface between the bearing section 180 of the bearing end part 178 on the one hand and the bearing receptacle 188 on the other hand from the in Fig. 7 working position shown in Fig. 15 illustrated release position is pivotable.

In the working position, the longitudinal axis 170 of the clamping screw 168 is preferably aligned essentially perpendicular to the support surface 106 of the housing 108 of the clamping device 100.

At the end of the clamping screw 168 facing away from the bearing end part 178, an actuating end part 190 is formed which an operator can grip with his hand or a tool to rotate the clamping screw 168 about its longitudinal axis 170 and thereby move the clamping arm 136 into the desired working position move.

The actuating end part 190 can in particular be designed as a tensioning screw head.

The actuating end part 190 preferably has a polygonal cross section, for example a hexagonal cross section, taken perpendicular to the longitudinal axis 170 of the clamping screw 168.

A guide section 192 of the clamping screw 168 lying between the actuating end part 190 and the thread 172 of the clamping screw 168 penetrates a guide opening 194 in a guide element 196 of the clamping device 100.

The guide element 196 is guided displaceably on the housing 108 of the clamping device 100 that it can be moved from one to the other Fig. 7 and 15th engaged position shown, in which the clamping screw 168 is in engagement with the clamping arm 136, in a Fig. 15 The release position shown, in which the clamping screw 168 is out of engagement with the clamping arm 136, and can be displaced from the release position back into the engagement position.

The tensioning device 100 further comprises a pretensioning device 198, which the guide element 196 into the Fig. 7 and 16 pretensioned engagement position shown.

The pretensioning device 198 can in particular comprise a pretensioning spring 200 which is fixed on a housing-side end region 202 on the housing 108 of the tensioning device 100 and on an end region 204 on the guide element side on the guide element 196.

The guide element 196 and the pre-tensioning device 198 form components of a decoupling device 206 of the tensioning device 100, by means of which the thread 172 of the tensioning screw 168 can be brought out of engagement with the engagement section 176 of the tensioning arm 136.

This decoupling device 206 further comprises a latching device 208, by means of which the guide element 196 can be latched in the engagement position and in the release position relative to the housing 108.

How best to look Fig. 8 can be seen, the latching device 208 comprises two latching parts 210, which between one in the Fig. 8 and 14th locking position shown, in which the locking parts 210 lock the guide element 196 in the engagement position or in the release position and one in the Fig. 9 and 10 Unlatching position shown, in which the locking parts 210 a movement of the guide element 196 from the Engaging position in the release position or release from the release position in the engagement position, are movable.

The movement of the latching parts 210 from the latching position into the unlatching position or from the unlatching position into the latching position takes place preferably along the transverse direction 116 of the clamping device 100.

Both latching parts 210 are preferably guided displaceably in a guide channel 212 of the guide element 196, the guide channel 212 preferably extending through the guide element 196 in the transverse direction 116 of the clamping device 100.

The latching device 208 further comprises a spring element 214, which biases the two latching parts 210 into the latching position.

The spring element 214 can be designed, for example, as a helical spring.

The end regions of the spring element 214 facing away from one another can each be received in a spring element receptacle 216 of one of the latching parts 210.

The two latching parts 210 protrude from the housing 108 of the clamping device 100 in opposite directions 218a and 218b, respectively, which are both aligned parallel to the transverse direction 116.

Each of the latching parts 210 is provided at its end facing away from the respective other latching part 210 with an actuating element 220 on which an operator can act in order to move the respective latching part 210 into the unlocking position.

In particular, it can be provided that an operator attacks the actuating elements 220 of both latching parts 210 at the same time in order to move the latching parts 210 towards one another into the unlocking position against the elastic restoring force of the spring element 214.

Each of the actuation elements 220 can be designed as an actuation button.

In order to carry out a quick adjustment of the tensioning arm 136 over a large pivot angle about the pivot axis 134 of 60 ° or more with the decoupling device 206 described above, the following procedure is followed:
Based on the in the Fig. 7 and 8th illustrated working position of the clamping device 100, in which the engagement portion 176 of the clamping arm 136 is in engagement with the thread 172 of the clamping screw 168 and the clamping arm 136 is, for example, in its upper end position, the guide element 196 is in the engagement position and the latching parts 210 of the locking device 208 are in the latching position, the latching parts 210 of the latching device 208 are in the Fig. 9 The unlocking position shown is transferred by an operator engaging the actuating elements 220 of the locking parts 210 and moving them toward one another along the transverse direction 116 of the clamping device 100.

In the in Fig. 9 In the unlocking position shown, the locking parts 210 move the guide element 196 from the position shown in FIG Fig. 9 engagement position shown in the in Fig. 10 Released position shown free.

The movement of the guide member 196 from the in Fig. 9 engagement position shown in the in Fig. 10 The release position shown takes place in that the operator gripping the actuating elements 220 moves the latching parts 210 in the longitudinal direction 114 of the clamping device 100 from the front of the housing 108, at which the clamping arm 136 emerges from the housing 108, to the rear, towards the rear of the housing 108.

This state, in which the guide element 196 is in the release position and the latching parts 210 are in the unlocking position, is not shown in FIG Fig. 10 also in the Fig. 11 and 12th shown.

Because the operator no longer acts on the actuating elements 220 of the latching parts 210, the latching parts 210 are moved apart by the spring element 214 in the directions 218a, 218b, so that they are in the Fig. 13 and 14th Assume the locking position shown, in which the locking parts 210 lock the guide element 196 in the release position.

How out Fig. 15 As can be seen, in this state of the tensioning device 100 the engagement section 176 of the tensioning arm 136 is out of engagement with the thread 172 of the tensioning screw 168, so that the tensioning arm 136 independently of a rotation of the tensioning screw 168 relative to the housing 108 of the tensioning device 100 from a first Working position, for example the upper end position of the clamping arm 136, can be pivoted into any second working position, for example into the lower end position of the clamping arm 136.

This quick adjustment of the tensioning arm 136 saves a great deal of setting time that would otherwise have to be expended to move the tensioning arm 136 in the working position by turning the tensioning screw 168 about its longitudinal axis 170 from the first working position, for example the upper end position of the tensioning arm 136, into the second Working position, for example the lower end position of the clamping arm 136, to move.

When the clamping arm 136 has been moved into the desired second working position, for example into the lower end position of the clamping arm 136 (see Fig. 16 ), the guide element 196 is transferred from the release position back into the engagement position in that an operator moves the latching parts 210 against the elastic restoring force of the spring element 214 from the latching position in which the latching parts 210 lock the guide element 196 in its release position into the unlocking position, in which the latching parts 210 release a movement of the guide element 196 from the release position into the engagement position.

Subsequently, the guide element 196 released from the locking in the release position is moved by the pre-tensioning device 198, in particular the pre-tensioning spring 200, from the release position into the engagement position in which the thread 172 of the tensioning screw 168 is again in engagement with the engagement section 176 of the tensioning arm 136.

As soon as the guide element 196 has reached the engagement position, the locking parts 210 are moved by the spring element 214 along the directions 218a and 218b from the unlocking position into the locking position, so that the guide element 196 is locked in the engagement position and secured against moving back into the release position.

This means that the in Fig. 16 The working position shown of the clamping device 100 is reached, in which the clamping arm 136 is in the desired second working position, for example in the lower end position of the clamping arm 136.

How best from the Fig. 7 and 16 As can be seen, the clamping device 100 comprises an upper chip protection element 222 and a lower chip protection element 224, these chip protection elements 222, 224 each having a space between two opposing inner walls 226a, 226b of the housing 108 of the clamping device 100 at least partially cover, so that an interior 228 of the housing 108, in which the engagement section 176 of the tensioning arm 136 and the thread 172 of the tensioning screw 168 are arranged, through the chip protection elements 222, 224 against the penetration of chips and / or other contaminants from the outer space 142 of the Housing 108 is protected.

The upper chip protection element 222 is fixed to a top wall 230 of the housing 108 and extends both in the FIG Fig. 7 shown upper end position of the tensioning arm 136 as well as in the in Fig. 16 The illustrated lower end position of the tensioning arm 136 up to an upper circumferential surface 232 of the tensioning arm 136 or at least up to the vicinity of this upper circumferential surface 232.

An edge section 234 of the upper tension protection element 222 facing the tensioning arm 136 preferably rests against the upper circumferential surface 232 of the tensioning arm 136 or is spaced from the upper circumferential surface 232 of the tensioning arm 136 by less than 2 mm, in particular by less than 1 mm.

The lower chip protection element 224 is fixed on a bottom wall 236 of the housing 108 and extends up to a lower peripheral surface 238 of the tensioning arm 136 or at least up to the vicinity of the lower peripheral surface 238.

Preferably, an edge section 240 of the lower tension protection element 224 facing the tensioning arm 136 rests on the lower circumferential surface 238 of the tensioning arm 136 or is spaced from the lower circumferential surface 238 of the tensioning arm 136 by less than 2 mm, in particular by less than 1 mm.

Each of the chip protection elements 222, 224 can in particular be embodied in the form of a plate and / or in the form of a sheet.

How best from the Fig. 3 and 4th As can be seen, the free end region 144 of the tensioning arm 136 has a longitudinal center plane 242 which runs through the longitudinal axis 170 of the tensioning screw 168, preferably regardless of whether the tensioning screw 168 is in the engaged position or in the release position and preferably independently of the working position in which the tensioning arm 136 is located.

In order to achieve that an operating tool 244 (see fig Figures 17 to 22 ) can extend from the area above the tensioning arm 136 laterally past the tensioning arm 136 into the area of the fastening means receptacle 124 of the housing 108 of the tensioning device 100, the tensioning arm 136 is provided with a bend 246, which is thus formed on the tensioning arm 136 and it is arranged that a side wall 250 of the tensioning arm 136 facing the fastening means receptacle 124 in the cranked area 248 of the tensioning arm 136 is offset by the distance Δ along the transverse direction 116 of the tensioning device 100 with respect to the same side wall 250 in the free end area 144 of the tensioning arm 136, and from a lateral edge 252 of the fastening means receptacle 124 towards an inner wall 226b of the housing 108 facing away from this lateral edge 252 of the fastening means receptacle 124.

The side wall 150 of the tensioning arm 136 in the free end region 144 of the tensioning arm 136 on the one hand and the lateral edge 252 of the fastening means receptacle 124 on the other hand are almost in the same plane perpendicular to the transverse direction 116 of the tensioning device 100, and the offset Δ generated by the bend 246 is almost the same size as the width of the fastener receptacle 124, that is, its extension in the transverse direction 116, so that the cranked area 248 of the tensioning arm 136 the fastener receptacle 124 - seen in the plan view from above along the height direction 118 of the tensioning device 100 - overlaps only to a small extent or not at all.

It is therefore possible for the actuating tool 244 to extend laterally past the angled area 248 of the tensioning arm 136 to a fastening means 128 of the clamping device 100 received in the fastening means receptacle 124 when the clamping arm 136 is in its upper end position, as is the case in the Figures 17 to 19 is shown.

The actuating tool 244 can be designed, for example, as an Allen key (Allen key) 254, which comprises a long straight tool section 256, a short straight tool section 258 and a curved tool section 260 connecting the short straight tool section 258 and the long straight tool section 256 to one another.

As from the Figures 17 to 19 As can be seen, the long straight tool section 256 can extend laterally past the tensioning arm 136 from the cranked area 248 of the tensioning arm 136 to the fastening means 128 received in the fastening means receptacle 124, in particular up to a fastening screw 130 of the fastening means 128, when the tension arm 136 is in its upper end position.

As from the Figures 20 to 22 As can be seen, the bend 246 of the tensioning arm 136 is also designed and arranged on the tensioning arm 136 in such a way that the actuating tool 244 engaging the fastening means 128 arranged in the fastening means receptacle 124 for actuating the fastening means 128 also laterally at the angled area 248 of the tensioning arm 136 can extend past to the fastening means 128 when the tensioning arm 136 is in its lower end position.

In all working positions of the tensioning arm 136 between the upper end position and the lower end position of the tensioning arm 136, the actuating tool 244 can be arranged on the tensioning device 100 in such a way that it is laterally on the cranked area 248 of the tensioning arm 136 extends past from above the tensioning arm 136 up to the fastening means 128 in order to engage the fastening means 128 and to actuate the same in order to fasten the clamping device 100 to the substrate 126.

As from the Fig. 3 and 4th As can be seen, the bend 246 on the tensioning arm 136 is also designed so that a side wall 262 of the tensioning arm 136 facing away from the fastening means receptacle 124 in the cranked area 248 opposite the free end area 144 of the tensioning arm 136 along the transverse direction 116 of the tensioning device 100 from the lateral edge 252 of the fastener receptacle 124 is offset away from an inner wall 226b of the housing 108 facing away from the lateral edge 252 of the fastener receptacle 124 by the distance Δ '.

If the offset Δ 'of the side wall 262 of the tensioning arm 136 facing away from the fastening means receptacle 124 is equal to the offset Δ of the side wall 250 of the tensioning arm 136 facing the fastening means receptacle 124, the tensioning arm 136 has in its free end region 144 and in the The cranked area 248 has the same width, that is to say the same extent along the transverse direction 116 of the clamping device 100.

If the offset Δ 'of the side wall 262 facing away from the fastening means receptacle 124 is smaller than the offset Δ of the side wall 250 facing the fastening means receptacle 124, the clamping arm 136 has a smaller width in the cranked area 248 than in the free end area 144.

If the offset Δ 'of the side wall 262 facing away from the fastening means receptacle 124 is greater than the offset Δ of the side wall 250 of the clamping arm 136 facing the fastening means receptacle 124, the clamping arm 136 has a greater width in the cranked area 248 than in the free end area 144.

The angle which the longitudinal axis of the long straight tool section 256 of the actuating tool 244 encloses with the height direction 118 of the clamping device 100 when the actuating tool 244 moves laterally past the cranked area 248 of the clamping arm 136 from above the clamping arm 136 to a position in the fastening means. Mounting means 128 accommodated in the receptacle 124 extends, is preferably less than 10 °, in particular less than 5 °.

This applies when the tensioning arm 136 is in its upper end position, when the tensioning arm 136 is in its lower end position and / or when the tensioning arm 136 is in a working position between the upper end position and the lower end position.

In order to fasten the clamping device 100 by means of the fastening means 128 to a base 126, for example a machine table, which has a T-slot (not shown), the T-slot piece 132 is pushed into the relevant T-slot, the clamping device 100 so on the base 126 is arranged so that the fastening means receptacle 124 is located in the vertical direction 118 of the clamping device 100 above the T-slot piece 132, and the fastening screw 130 is inserted into the fastening means receptacle 124 so that its thread engages the internal thread of the T. -Nutsstücks 132 comes.

The actuating tool 244 is then brought into engagement with the head of the fastening screw 130 in such a way that the long straight tool section 256 extends from the fastening screw 130 laterally past the cranked area 248 of the tensioning arm 136 to the area above the tensioning arm 136, as shown in FIG the Figures 17 to 22 is shown.

Then an operator grips the short straight tool section 258 of the operating tool 244 in order to rotate the long straight tool section 256 about its longitudinal axis and thereby screw the fastening screw 130 in engagement with the operating tool 244 into the internal thread of the T-slot piece 132 until the T-slot piece 132 and the housing 108 of the clamping device 100 are braced against the base 126, for example a machine table, so that the clamping device 100 is releasably fixed on the base 126.

In order to prevent the housing 108 of the clamping device 100 from rotating relative to the substrate 126 during the fastening process and / or during the operation of the clamping device 100 for clamping a workpiece, an anti-rotation device 264 is provided on the underside of the housing 108, in particular as a recess can be designed with a non-rotationally symmetrical cross-section (see Fig. 4 ).

In the exemplary embodiment shown, the anti-rotation device 264 is designed, for example, as an essentially cuboid recess in the bottom wall 236 of the housing 108.

The anti-rotation lock 264 can be brought into engagement with a complementary positioning element when the clamping device 100 is placed on the base 126, so that the engagement between the positioning element fixed on the base 126 and the anti-rotation lock 264 on the housing 108 of the clamping device 100 causes a rotation of the Housing 108 of the clamping device 100 is prevented relative to the substrate 126.

Claims (15)

Clamping device for clamping a workpiece (102), comprising a housing (108),
a clamp arm (136) pivotally supported on the housing (108) and
a tensioning screw (168) which is rotatably mounted about a longitudinal axis (170) of the tensioning screw (168),
wherein the tensioning screw (168) has a thread (172) and the tensioning arm (136) has an engagement section (176) which, in an operating state of the tensioning device (100), is in engagement with the thread (172) of the tensioning screw (168),
characterized,
that the tensioning device (100) comprises a decoupling device (206) by means of which the thread (172) of the tensioning screw (168) can be brought out of engagement with the engagement section (176) of the tensioning arm (136), so that the tensioning arm (136) is independent of rotation of the clamping screw (168) relative to the housing (108) of the clamping device (100) is pivotable between a first working position and a second working position. Clamping device according to claim 1, characterized in that the decoupling device (206) comprises a guide element (196) which receives a guide section (192) of the clamping screw (168) and between an engagement position in which the clamping screw (168) engages the clamping arm (136) and a release position, in which the clamping screw (168) is out of engagement with the clamping arm (136), can be moved. Clamping device according to Claim 2, characterized in that the decoupling device (206) comprises a prestressing device (198) which prestresses the guide element (196) into the engagement position. Clamping device according to one of claims 2 or 3, characterized in that the decoupling device (206) comprises a latching device (208) by means of which the guide element (196) can be latched in the engagement position and / or in the release position. Clamping device according to claim 4, characterized in that the latching device (208) comprises at least one latching part (210) which, between a latching position in which the latching part (210) locks the guide element (196) in the engagement position and / or in the release position, and an unlocking position, in which the locking part (210) releases a movement of the guide element (196) from the engagement position into the release position and / or from the release position into the engagement position, is movable. Clamping device according to claim 5, characterized in that the latching device (208) comprises a spring element (214) which biases the at least one latching part (210) into the latching position. Clamping device according to one of claims 5 or 6, characterized in that the locking device (208) comprises two locking parts (210) which protrude in opposite directions (218a, 218b) from the housing (208) of the clamping device (100). Clamping device according to one of Claims 5 to 7, characterized in that at least one latching part (210) comprises an actuating element (220) which an operator can grip in order to move the latching part (210) into the unlatched position. Clamping device according to one of Claims 5 to 8, characterized in that at least one latching part (210) is guided displaceably in a guide channel (212) of the guide element (196). Clamping device according to one of Claims 1 to 9, characterized in that the clamping screw (168) has an actuating end part (190) on which a screwing tool can act in order to rotate the clamping screw (168) about its longitudinal axis (170). Clamping device according to one of Claims 1 to 10, that the clamping screw (168) has a bearing end part (178) by means of which the clamping screw (168) is pivotably mounted relative to the housing (108) of the clamping device (100). Clamping device according to claim 11, characterized in that the bearing end part (178) has a partially spherical bearing section (180) which is arranged in a partially complementary bearing receptacle (188) of the housing (108) of the clamping device (100). Clamping device according to one of Claims 1 to 12, that the clamping arm (196) can be pivoted by an angle of at least 30 ° relative to the housing (108) of the clamping device (100) when the thread (172) of the clamping screw (168) is out of engagement with the engaging portion (176) of the tension arm (136). Clamping device according to one of Claims 1 to 13, characterized in that the clamping device (100) comprises at least one chip protection element (222, 224) which forms a space between two opposing inner walls (226a, 226b) of the housing (108) of the clamping device (100 ) at least partially covers. Clamping device according to claim 14, characterized in that at least one chip protection element (222, 224) has an edge section (234, 240) which rests against the clamping arm (136) or is spaced from the clamping arm (136) by less than 2 mm.

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