CN102785231B - Tool receiving device - Google Patents

Abstract

The invention relates to a tool receiving device for a machining tool (14; 14a), in particular a drilling and/or chiseling tool, which has at least one first form-fitting device (30, 32; 30a, 32a ), the tool receiving device has a fastening device (38; 38a), the fastening device has at least one second form-fitting device (40; 40a), and the fastening device is provided for at least one operating state with The first form-locking means (30, 32; 30a, 32a) together limit the movement play (44; 44a) of the movement of the machining tool (14; 14a) along the movement axis (26; 26a), the tool The receiving device has an upstream release actuation device ( 42 ; 42 a ), which is provided for canceling the limitation of the movement play ( 44 ; 44 a ). The invention proposes that the tool receiving device has a bearing unit (46; 46a), which is provided for movably mounting the second form-locking device (40; 40; ) along at least one bearing axis (48; 48a). 40a), the bearing axis encloses an angle (50; 50a) between 0° and 90° with the movement axis (26; 26a).

Description

tool receiver

technical field

The invention relates to a tool receiving device.

Background technique

Hammer drills are known with a tool receiver for a machining tool having a first form-locking device, the tool receiver having a fixing device with a second form-fitting device configured as a ball device and is provided for limiting the movement play of the movement of the machining tool along the axis of motion together with the first form-fitting device in an operating state, the tool receiving device has a release operating device, the release operation device is provided Used to cancel the restriction on the movement gap. The ball is mounted so that it can move along an axis oriented perpendicularly to the axis of movement.

Contents of the invention

The invention relates to a tool receptacle for a processing tool having at least one first form-fitting device, the tool receptacle having a fastening device having at least one second form-fitting device and the The fastening device is provided for limiting the movement play of the machining tool along the movement axis in at least one operating state together with the first form-fitting device, the tool receiving device has a preceding release actuating device, The release actuation device is provided to cancel the limitation of the movement play.

The invention proposes that the tool receiving device has a bearing unit, which is provided for movably mounting the second form-locking device along at least one bearing axis, which is sandwiched between 0° and the axis of motion. Angles between 90°. A "processing tool" is to be understood in particular as a tool which is provided for processing a workpiece and/or a material to be processed. In particular, the machining tool is designed as a rotary and/or percussion tool, preferably a drilling and/or chisel tool. Preferably, the processing tool has at least one, preferably cylindrical coupling region, which is provided for insertion into the tool receptacle. In particular, the coupling region has a length which is at least twice as large, in particular at least three times as large and preferably at least five times as large as the diameter of the cylindrical coupling region. A “form-fitting means” is to be understood in particular as a formation of a component which is provided for producing a form-fit with a corresponding form-fitting means. In particular, the form-fitting means are configured as recesses, protrusions and/or as a combination of recesses and protrusions. “Axis of movement” is to be understood in particular as an axis along which the machining tool is at least substantially guided during the insertion or removal process. Preferably, the axis of movement corresponds to the center axis of the receiving area, in particular the bore, which is provided for guiding the machining tool during the insertion or removal process. A "hole" is to be understood in particular as a recess in a component, which passes through the component along a connecting line, in particular a connecting curve, preferably a straight line, between two surface points of the component and here is preferably at the center of this line. At least one point is surrounded by the component material in cross-section. In particular, the hole has a length which is at least twice as large, in particular at least three times as large, preferably at least five times as large as the hole diameter. Preferably, the receiving area has an at least substantially circular cross-section in plan view along the axis of movement. “Limited movement play” is to be understood as meaning that, especially in an operating state with a stationary machining tool, at least two points are defined at which forward movement of the machining tool is prevented. Preferably, the points are spaced apart from one another by a boundary distance which is determined in particular by the extent of the first and second form-fitting means. In particular, the boundary distance is especially at least 3 mm, especially at least 5 mm, preferably at least 10 mm. Alternatively, in particular a configuration of the machining tool is conceivable, which leads to the coincidence of the at least two points to form a single point. In particular, the boundary distance is at least at least a quarter, in particular at least a half, preferably at least the entirety of the largest diameter of the coupling region of the processing tool. "Release actuating device" is to be understood in particular as an actuating device which is intended to be actuated by an operator in order to release, preferably tool-free, the non-positive and/or form-locking of the processing tool with the tool receptacle combined connection. Preferably, the release actuation device is provided for an in particular linear movement at least substantially parallel to the machining axis of rotation. Alternatively, a solution is conceivable in which the release actuation device is at least partially provided for a rotational movement, in particular for a rotational movement about an axis of movement and/or about an axis oriented at least substantially parallel to the axis of movement. “Tool-free” is to be understood in particular to mean that it is possible to dispense with the use of devices other than those connected to the tool holder, at least in the assembled, in particular operative, state of the tool holder. A "preceding" release actuation device is to be understood in particular as a release actuation device which, of all release actuation devices of the tool receptacle, is closest to the processing end of the processing device fastened in the tool receptacle, in particular knife point. “Machining end” is to be understood in particular as the end of the machining tool which lies opposite the coupling region. In particular, the tool receiving device has exactly one release actuation device. Preferably, the bearing unit is formed substantially as a bore, preferably with a circular cross-section, which extends along the bearing axis. The bearing axis here in particular forms the center axis of the bore. Preferably, the second form-fitting means and the bearing unit have at least one holding device, which is provided for limiting the movement of the second form-fitting element in at least one direction. The second form-locking device is "movably mounted", which should be understood in particular to mean that it can be moved by a path of at least 1 mm, in particular of at least 2 mm, preferably of at least 4 mm. Preferably, the actuation of the actuating device can be eliminated when inserting the machining tool, wherein the second form-locking device is moved automatically, in particular driven by the machining tool, along the bearing axis. In particular, elastic deformations of the parts that are in direct contact with the second form-fitting means are at least substantially eliminated during insertion of the machining tool. Preferably, the point of intersection of the bearing axis or one of the axes parallel to the bearing axis with the movement axis is located closer to the front end of the power tool than the intersection of the bearing axes and/or any point containing a point of the second form-locking means . The first and second axes "enclose an angle" are to be understood in particular to mean that an axis parallel to the first axis and intersecting the second axis forms an angle with the second axis. Preferably, the first axis intersects the second axis. In particular, the wear of the form-fitting device can be reduced.

It is further proposed that the bearing axis encloses an angle with the movement axis which deviates from 30° by less than 25°, in particular less than 15°, advantageously less than 10°, preferably less than 5°. In particular, the wear of the form-fitting device can be reduced.

In another refinement, the second form-fitting means is designed as a pin. A “bolt” is to be understood in particular as a part whose length is greater than 100%, in particular 130%, preferably 170%, preferably 200%, of the largest diameter of the part. Preferably, the length of the pin extends along the bearing axis in the assembled state. The “diameter” of the bolt at a location is to be understood as the diameter of the smallest circle, in particular a circle lying in a plane oriented perpendicular to the bearing axis and containing the location, which completely surrounds the bolt. The pins preferably have a circular cross-section transversely to the bearing axis, whereby in particular jamming of the pins in the bearing unit can be avoided. In particular, the pin has a diameter change along the bearing axis, which serves as a holding device. In particular, low wear can be achieved, wherein, in particular, the contact surface between the second form-fitting means and the bearing unit and/or the first form-fitting element is designed to be larger than in the design as a ball, in which case as a ball In this design, the forces that cause wear in particular are distributed over only a few points.

In another advantageous refinement, the release actuation device is designed as a sleeve. In particular, the sleeve is arranged parallel to the axis of movement. Preferably, the sleeve surrounds at least a part of the tool receptacle in a radial direction about the axis of movement. Alternatively, an embodiment of the invention is conceivable in which the release actuation device is formed by a slide switch and/or a plurality of release actuation devices, of which at least one, in particular at least two, advantageously each release actuation device must preferably simultaneously ground to be operated in order to cause the release of the processing tool. In particular, the operating comfort can be increased.

In a further refinement it is provided that the fastening device has at least one coupling unit which is provided to convert the movement of the release actuation device into a linear movement of the second form-locking device along the bearing axis. Preferably, the coupling unit comprises at least one guide element which, in an assembled state, has a form-fit in the direction of the bearing axis with the second form-fitting means and in particular enables the second form-fitting means to be laterally Orientation on the support axis. In principle, movement profiles other than a straight line are also conceivable, wherein in particular the second form-locking means has a curved shape and is preferably guided in a curved guide unit. In particular, increased comfort can be achieved.

In another configuration, it is proposed that the fastening device has at least one spring unit, which is provided for exerting a clamping force on at least the second form-fitting device in at least one operating state. In particular, the spring unit is provided for securing the second form-fitting device in a standard position. In particular, the standard position is determined by a stop, preferably a stop of the coupling unit. The standard position is assumed by the second form-fitting device at least in one operating state without insertion of the machining tool. A "spring unit" is to be understood in particular as a unit which comprises at least one spring element. A "spring element" is to be understood in particular as a macroscopic element which has at least one extension which, in the normal operating state, can be elastically varied by at least 10%, in particular at least 20%, preferably at least 30% and particularly advantageously At least 50%, and it produces in particular a counter force related to and preferably proportional to the change in extension length, which counter force opposes this change. The "length of extension" of an element is to be understood in particular as the maximum distance between two points of the perpendicular projection of the element on a plane. A "macroscopic element" is to be understood in particular as an element having an extension of at least 1 mm, especially at least 5 mm and preferably at least 10 mm. The spring unit “acts” a clamping force on the second form-fitting device, which is to be understood in particular that the clamping force of the spring unit acts on the second form-fitting element, in particular via a further element. In particular, the clamping force with which the spring element acts on the second form-fitting device increases when the second form-fitting device is moved away from its standard position. In particular, the spring unit is provided to act on the release actuation device with a clamping force at least during the release process. In particular, reliable operation can be ensured.

In a further refinement of the invention it is proposed that the tool receiving device has at least one connecting unit which is provided for producing a tool-free detachable connection to the machine tool body. Preferably, an operating element, in particular a sleeve, is provided for disconnecting the connection, in particular by means of a mechanism. The operating element is preferably pretensioned by a spring unit in order to avoid unintentional release. In particular, increased flexibility can be achieved.

The invention also relates to a portable power tool, in particular a hand-held power tool, which has a tool receiving device according to the invention. A “portable power tool” is to be understood here in particular as a power tool, in particular a hand-held power tool, which can be transported by a user without a transporter. Portable power tools especially have a mass of less than 40 kg, preferably less than 10 kg and particularly preferably less than 5 kg. Advantageously, high operating comfort can be achieved for a user of the hand-held power tool.

The tool receiving device according to the invention should not be limited to the application and embodiments described above. In particular, the tool receiving device according to the invention can have a different number of individual elements, parts and units than the number mentioned here in order to satisfy the mode of operation described here.

Description of drawings

Further advantages are given by the following description of the figures. Exemplary embodiments of the invention are shown in the drawings. The drawings, the description and the claims contain numerous features in combination. A person skilled in the art will also consider these features individually and combine them into meaningful further combinations in a suitable manner. which shows:

FIG. 1 shows a schematic diagram of a handheld power tool according to the invention,

FIG. 2 shows a schematic view of a section of a tool receiving device according to the invention,

FIG. 3 shows a detailed view of the coupling unit in a top view against the direction of insertion,

FIG. 4 shows a detail of the section according to FIG. 2 with a stationary machining tool in maximum deflection,

FIG. 5 schematically shows a detail of the section according to FIG. 2 during insertion of the machining tool, and

FIG. 6 shows a schematic illustration of a section through an altered tool holder according to the invention.

detailed description

FIG. 1 shows an electric hand-held power tool 10 configured as a hammer drill with a tool receptacle 12 according to the invention. The tool receptacle 12 is provided for receiving a machining tool 14 which can be designed as a drill and/or chisel. The machining tool 14 is inserted into the tool receptacle 12 in an insertion direction 27 along a movement axis 26 . In addition, electric hand tool machine 10 has a motor unit 16 and a transmission unit 18 . The transmission unit 18 here has a switching unit which is provided for switching between a rotary output, a percussive output and a rotary and percussive output (not shown in detail). The torque generated by the motor unit 16 is converted by the transmission unit 18 into an operating function set by the operator and introduced to an output unit 20 with a hammer mechanism. The output unit 20 is directly connected to the tool receiving device 12 . In rotary operation, the axis of movement 26 coincides with the axis of rotation 28 of the machining tool 14 . The motor unit 16 , the transmission unit 18 and the output unit 20 are surrounded by two housing halves 24 . In principle, designs are also conceivable in which the units are arranged in two or more pot-shaped housing parts.

FIG. 2 shows a section through the tool holder 12 according to the invention with an inserted machining tool 14 , the section including the axis of movement 26 . The processing tool 14 is designed as an SDS-plus tool, wherein other configurations are also conceivable, in particular SDS-quick or SDS-max. The machining tool 14 has two first form-fit devices 30 , 32 and two further form-fit devices (not shown). The two first form-fitting means 30 , 32 are here arranged diametrically on a shank 34 of the machining tool 14 . The first form-fitting means 30 , 32 are designed as two-stage recesses of the cylindrical shaft 34 , which extend in the longitudinal direction parallel to the axis of movement 26 . In their end regions, the first form-fitting means 30 , 32 each merge into a circular shank profile. The two further form-fit devices are likewise arranged diametrically, but offset by 90° relative to the first form-fit device 30 , 32 . The further form-fit means are likewise designed as recesses and extend parallel to the first form-fit means 30 , 32 as far as the end 36 of the shaft 34 . A further positive fit is provided for producing a positive fit between the machining tool 14 and the tool receptacle 12 about the axis of movement 26 in the circumferential direction. The tool receiving device 12 has a fastening device 38 which has a second form-fitting device 40 and which is provided for limiting the movement of the processing tool 14 along with the first form-fitting device 30 or 32 in at least one operating state. The movement gap 44 of the movement of the axis 26, and the tool receiving device has a front release operating device 42, which is provided for canceling the limitation of the movement gap 44, which is characterized in that a bearing unit is provided 46 , which bearing unit is provided for movably mounting the second form-locking device 40 along a bearing axis 48 which encloses an angle 50 of 30° with the axis of movement 26 . The bearing unit 46 is designed as a bore in the base body 56 of the tool receptacle 12 . Here, the bearing unit 46 connects the outer side of the base body 56 to a receiving region 58 , which is likewise designed as a hole and extends through the base body 56 along the movement axis 26 . The receiving area 58 serves to receive the processing tool 14 .

The second form-fitting device 40 is designed as a bolt. The second form-fitting device 40 is configured as a rotating body. The bearing axis 48 corresponds here to the axis of symmetry in the assembled state. At the end 52 of the second form-fitting means 40 facing the movement axis 26 , the second form-fitting means 40 is rounded with a spherical segment. The radius of curvature of the spherical segment is greater than the radius of the cylinder adjoining the spherical segment. The cylinder has a radius of 3.3 mm. A further cylinder with a larger radius is connected to the cylinder after a length. This length is equal to 10 mm, ie approximately half the length of the form-fitting means 40 . The second cylinder has a maximum radius of 4.5 mm. The radius of this further cylinder tapers at its ends. At the end 54 of the form-fitting device 40 facing away from the axis of movement 26 , connected to a further cylinder, the form-fitting device has a molding designed as a mushroom-shaped bolt, ie a cylinder, on which the A head having a larger diameter than the cylinder. The cylinder of the mushroom-shaped plug has a diameter of 3 mm. In another configuration, the second cylinder can be omitted, wherein the first cylinder is extended by a corresponding distance and the mushroom-shaped pin is connected directly to the first cylinder.

The fastening device 38 has a coupling unit 60 which is provided to convert the movement of the release actuation device 42 into a linear movement of the second form-fitting device 40 along the bearing axis 48 . The coupling unit 60 is composed of a base body 56 and a ring 62 on which a tongue 64 is integrally provided. The ring 62 is guided on the outer surface 72 of the base body 56 . The base body 56 has a groove 57 which enables a guide for the tongue 65 ( FIG. 3 ). The tongue 64 is bent from the ring 62 at an angle corresponding to the angle 50 between the bearing axis 48 and the movement axis 26 . The ring 62 is arranged in a plane oriented perpendicular to the axis of movement 26 . The coupling unit 60 has a guide 66 . This guide is arranged in the tongue 64 and is designed as an elongated hole in which a recess 68 of the second form-locking device 40 is guided, which recess is formed by the mushroom pin and the further cylinder. The guide 66 is widened in the transition region from the tongue 64 to the ring 62 at an end facing away from the axis of movement 26 in the assembled state, in order to be able to pass the head of the mushroom-shaped bolt and thus to guide the mushroom-shaped bolt Insert into the guide 66. The release actuation device 42 has an edge 70 against which the ring 62 of the coupling unit 60 rests in the assembled state. By releasing the linear movement of the actuating device 42 along the movement axis 26 in the insertion direction 27 , the ring 62 is guided along the outer surface 72 . Due to the form-fitting connection and guidance of the mushroom pin of the second form-fitting device 40 to the guide 66 of the coupling unit 60 , the second form-fitting device 40 is moved outwards along the bearing axis 48 . In this case, the recess 68 in the guide 66 is guided outwards in the direction of widening.

The release actuation device 42 is designed as a sleeve. The release actuation device 42 here forms approximately 80% of the outer boundary of the tool receptacle 12 . The release actuation device 42 bears against the protective hood 74 , the coupling unit 60 and the spacer ring 76 and can be guided along them parallel to the axis of movement 26 . The protective cap 74 is arranged on the front end of the base body 56 and is connected thereto. It consists of polymers with low hardness. The protective hood 74 is provided to enclose the shank 34 of the machining tool 14 and thus prevent dust from penetrating into the tool receptacle 12 . In addition, the protective cover 74 is used to prevent collisions in case the tool receiver 12 strikes the material to be processed during deep drilling. Alternatively, a design with a fastening sleeve is conceivable, in which one or more release actuating devices in the form of slide switches are provided.

The fastening device 38 has a spring unit 78 which is provided for exerting a clamping force on the second form-fitting device 40 in the operating state. The spring unit 78 has a single conical spring, which is designed as a compression spring. This type of spring enables a space- and material-saving construction compared to other spring types, for example disk springs or cylindrical springs. In other configurations of the invention, other, or additional, spring types are also conceivable which the person skilled in the art considers suitable. The spring unit 78 is arranged and clamped against each other between the spacer ring 76 and the ring 62 of the coupling unit 60 , which spacer ring is fixed relative to the base body 56 by means of the safety ring 77 . The coupling unit 60 is pressed onto the base body 56 . During insertion of the machining tool 14 , the form-locking means 42 are moved outwards by the chamfer 37 on the end 36 of the machining tool 14 ( FIG. 5 ). In this case, the recess 68 is guided along the guide 66 and the coupling unit 60 is moved parallel to the movement axis 26 in the insertion direction 27 toward the spring unit 78 . The spring unit 78 exerts a clamping force on the second form-fitting device 40 . When the processing tool is inserted far enough into the tool receptacle 12 , the clamping force ensures an automatic return movement of the second form-fitting device 40 toward the movement axis 26 into the form-fitting device 30 or 32 of the processing tool 14 . During the release process, the release actuating device 42 is moved toward the coupling unit 60 and thus toward the spring unit 78 . The clamping force is responsible for the return movement of the release actuating device 42 and the form-locking device 40 into their initial position, in which state the release actuating device 42 is subjected to the clamping force.

Tool receiving device 12 is connected to machine tool body 80 . The release actuation device 42 here encloses a part that acts on the housing half-shell 24 , thereby reducing the penetration of dust into the tool receptacle 12 . Base body 56 is pressed against hollow shaft 82 of output unit 20 , which is designed as a hammer tube. In addition, the locking collar 84 ensures a form-fitting, secure connection of the tool receiver 12 to the hollow shaft 82 . Designs with other connections are also conceivable. In particular, the locking ring 84 can be dispensed with or the hollow shaft 82 and the main body 56 have an outer or inner contour that differs from a circle and enables a positive fit in the direction of rotation. In another refinement, the hollow shaft 82 and the base body 56 are formed in one piece, that is to say are bonded together and/or are formed and/or cast from a single workpiece. The striking bolt 22 of the striking mechanism is guided in the hollow shaft 82 and can be driven by a transmission unit in a manner known to the person skilled in the art. In the fixed state, the processing tool 14 protrudes into the hollow tube 82 . If the striker pin 22 strikes the machining tool 14 , it moves forward and transfers the impact to the material to be machined. The processing tool is guided in its movement here by the first form-fitting device 30 or 32 and a further form-fitting device ( FIG. 4 ), which cooperates with a fixed form-fitting device 86 of the base body 56 . In idling operation, in which no material to be processed is located in front of the machining tool 14 , the machining tool 14 is moved forward along the movement axis 26 counter to the insertion direction 27 by the impact of the striker pin 22 until the form-locking device 30 or One end of the 32 hits the form-fitting device 40 . The angle 50 of the bearing axis 48 relative to the movement axis 26 is selected in such a way that the second form-fitting device 40 rests on two stages of the first form-fitting device 30 or 32 ( FIG. 4 ). In addition, the angle 50 is selected such that only a small force component is formed during impact, which drives the second form-locking means 40 outwards. The force component is absorbed by the spring unit 78 and the frictional force, so that an undesired loss of the machining tool 14 is avoided.

Another embodiment of the invention is shown in FIG. 6 . The following description is essentially limited to the differences between the exemplary embodiments, wherein for components, features and functions that remain the same, reference can be made to the description of the other exemplary embodiments, in particular FIGS. 1 to 5 . In order to distinguish these embodiments, the letter a is added to the reference numerals of the embodiment in FIG. 6 .

FIG. 6 shows a section through a tool receiving device 12 a according to the invention. Tool receiving device 12a has a connection unit 88a which is provided for producing a tool-free detachable connection to machine tool body 80a. Instead of being pressed against the spacer ring 76 , the conical spring of the spring unit 78 a is pressed directly against the safety ring 77 a. Machine tool body 80a has a connecting unit 89a corresponding to connecting unit 88a. The connecting unit 89a has an actuating device 90a designed as a sleeve, which is provided for releasing the connection. The actuating device 90 a is partially surrounded by the release actuating device 42 . On its side, the operating device 90a partially surrounds the housing half-shell 24a acting on the machine tool body 80a. The connecting unit 88a has form-locking means 92 , 93 designed as balls, which are mounted in bores of the main body 56a in a loss-resistant manner. In the assembled state, the base body 56 a surrounds a hollow tube 82 a configured as a hammer tube. The hollow tube 82 a has form-fitting means 94 a , 95 a designed as recesses, into which the form-fitting means 92 a , 93 a engage in the assembled state. A retaining ring 99a is connected to the actuating device 90a in a form-fitting manner via a safety ring 96a and a spring unit 98a having a spring element configured as a cylindrical spring, which is provided for pressing the form-fitting devices 92a, 93a into the shape. Locking device 94a, 95a. By pulling on the actuating device 90a in the insertion direction 27a parallel to the movement axis 26a, the securing ring 99a releases the form-fitting elements 92a, 93a. By pulling the tool receptacle 12a against the insertion direction 27a, the form-fit devices 92a, 93a can now be moved out of the form-fit devices 94a, 95a and the tool receptacle 12a is released from the power tool body 80a.

Claims (9)

1. machining tool (14 is used for；Tool holding apparatus 14a), the machining tool have the sealed dress of at least one first shape Put (30,32；30a, 32a), the tool holding apparatus have a fixing device (38；38a), the fixing device has at least one Individual second shape sealed device (40；40a), and the fixing device is arranged at least one running status and institute State first shape lock uint (30,32；30a, 32a) machining tool (14 is limited together；14a) along axis of movement (26； The movement clearance (44 of motion 26a)；44a), the tool holding apparatus are with a preceding release operation device (42； 42a), the release operation device is arranged for cancelling to the movement clearance (44；Restriction 44a), wherein, it is provided with supporting single Unit (46；46a), the bearing unit is arranged for along at least one supporting axis (48；Described is movingly supported 48a) Two shape lock uints (40；40a), the supporting axis and the axis of movement (26；26a) press from both sides into one 0 ° and 90 ° it Between angle (50；50a), it is characterised in that be provided with connection unit (88；88a), the connection unit be arranged for set up with Toolroom machine fuselage (80；The connection that toollessly can be unclamped 80a), is provided with a sleeve, and the sleeve is arranged for Separate the connection.

2. tool holding apparatus according to claim 1, it is characterised in that the supporting axis (48；48a) with the kinematic axiss Line (26；26a) at an angle, the angle is less than 25 ° with 30 ° of deviation to folder.

3. tool holding apparatus according to claim 1 or 2, it is characterised in that the second shape sealed device (40；40a) It is configured to bolt.

4. tool holding apparatus according to claim 1 or 2, it is characterised in that the release operation device (42；42a) by structure Make as sleeve.

5. tool holding apparatus according to claim 1 or 2, it is characterised in that the fixing device (38；38a) with least One coupling unit (60；60a), the coupling unit is arranged for the release operation device (42；Motion 42a) turns It is changed to the second shape sealed device (40；40a) along the supporting axis (48；Linear motion 48a).

6. tool holding apparatus according to claim 1 or 2, it is characterised in that the fixing device (38；38a) with least One spring unit (78；78a), the spring unit is arranged at least one running status at least to described second Shape sealed device (40；Clamping force is loaded 40a).

7. tool holding apparatus according to claim 1, it is characterised in that the instrument (14；It is 14a) that drilling and/or chisel are cut Instrument.

8. portable toolroom machine, which has the tool holding apparatus (12 according to one of above claim；12a).

9. toolroom machine according to claim 8, it is characterised in that the toolroom machine is hand held power machine.