Handheld machine tool having a tool holding fixture

In a handheld machine tool having a tool holding fixture, which has a multi-faced inner receptacle and a multi-faced outer receptacle, the multi-faced inner receptacle being configured for the connection to a first tool insert, which is able to be locked in the multi-faced inner receptacle using a locking device assigned to the tool holding fixture, and the multi-faced outer receptacle being configured for the connection to a second tool insert, which has an inner multi-faced coupling that is able to be slid onto the multi-faced outer receptacle. The locking device has an actuating element, which is rotatable about a longitudinal axis of the tool holding fixture for unlocking the first tool insert from a specified locking position into a specified unlocking position.

FIELD OF THE INVENTION

The present invention relates to a handheld machine tool having a tool holding fixture, which has a multi-faced inner receptacle and a multi-faced outer receptacle, the multi-faced inner receptacle being configured to connect to a first tool insert, which is able to be locked in the locking device associated with the tool holding fixture, and the multi-faced outer receptacle is configured for connecting to a second tool insert which has an inner multi-faced coupling that is able to be slid onto the multi-faced outer receptacle.

BACKGROUND INFORMATION

From European document EP 2 039 449 A1, a handheld machine tool configured as a rotary blow screwdriver is discussed, which has a tool holding fixture which is able to be connected both to a tool insert having an outer multi-faced coupling, such as a screwdriver bit, and to a tool insert having an inner multi-faced coupling, such as a socket wrench. To fix a screwdriver bit to the tool holding fixture, a locking device is provided in which an actuating sleeve, in an associated locking position, presses retaining balls radially inwards through openings provided in the tool holding fixture, so that the retaining balls engage with a groove configured on the outer multi-faced coupling of the screwdriver bit, and thus lock the screwdriver bit in the multi-faced inner receptacle of the tool holding fixture. The actuating sleeve is prestressed in an axial direction facing away from the screwdriver bit, using an associated compression spring and, to unlock the screwdriver bit, it has to be pushed against the force of this spring axially in the direction of the screwdriver bit, to enable the release of the retaining balls.

In the related art, the disadvantage is that the handling of the handheld machine tool is awkward and complicated during an actuation of the actuating sleeve, and consequently leads to a loss of convenience in the use of such a handheld machine tool.

SUMMARY OF THE INVENTION

It is therefore an object of the exemplary embodiments and/or exemplary methods of the present invention to provide a new handheld machine tool which has a tool holding fixture having a locking device which enables a simple and rapid unlocking of a tool insert having an outer multi-faced coupling.

The object may be attained by a handheld machine tool having a tool holding fixture which has a multi-faced inner receptacle and a multi-faced outer receptacle. The multi-faced inner receptacle is configured for connecting to a first tool insert, which is able to be locked to a locking device associated with the tool holding fixture in the multi-faced inner receptacle. The multi-faced outer receptacle is configured for connecting to a second tool insert, which has an inner multi-faced coupling that is able to be slid onto the multi-faced outer receptacle. The locking device has an actuating element which, for unlocking the first tool insert from a specified locking position, is rotatable about a longitudinal axis of the tool holding fixture into a specified unlocking position.

The exemplary embodiments and/or exemplary methods of the present invention are intended to provide a handheld machine tool having a tool holding fixture in which a tool insert having an outer multi-faced coupling is able to be locked reliably and securely, and which is easy to handle during unlocking, for removing such a tool insert.

According to one specific embodiment, the locking device has a blocking element for blocking the actuating element in the specified locking position or in the specified unlocking position.

Consequently, a certain blocking of the actuating element is able to be made possible in the locking position and in the unlocking position.

The actuating element may have a first and a second stopping element. In the specified unlocking position, the first stopping element lies against the blocking element so as to block the actuating element. In the specified locking position, the second stopping element lies against the blocking element so as to block the actuating element.

Consequently, reliable blocking of the actuating element is able to be achieved in the locking position and in the unlocking position at the blocking element in a simple manner.

The blocking element may be configured to prevent rotation of the actuating element beyond the specified locking position or the specified unlocking position.

Thus one is able to achieve stable and reliable blocking of the actuating element by the blocking element.

According to one specific embodiment, the actuating element is configured to be sleeve-shaped, and has a recess at its inner circumference, at which the blocking element is situated, at least in sections, and at which the first and second stopping element are configured in a shoulder-type manner.

Thus, the exemplary embodiments and/or exemplary methods of the present invention are intended to provide an uncomplicated and cost-effective actuating element.

The sleeve-shaped actuating element may be situated coaxially with the longitudinal axis of the tool holding fixture.

Thus one may achieve a simple and functionally safe positioning of the actuating element.

The blocking element may be configured like a bolt.

Thus a stable and cost-effective blocking element may be provided.

According to one specific embodiment, the locking device has a spring element, which is configured to act upon the actuating element using a specified spring force in a direction running transversely to the longitudinal axis of the tool holding fixture.

Consequently, the present invention enables providing an actuating element that is able to be adjusted in a simple manner, starting from the spring element, from the unlocking position back into the locking position.

The actuating element may be configured to be sleeve-shaped, and has on its inner circumference a groove having a stop, against which the spring element lies in the specified locking position.

Thus a simple and cost-effective actuating element may be provided.

The spring element may be configured to act upon the actuating element in the specified unlocking position using its spring force, to make possible the rotation of the actuating element relative to the tool holding fixture, the groove on the spring element being displaced until the stopping of the stop at the spring element.

Consequently, the present invention makes possible a convenient and automatic adjustment of the actuating element from the unlocking position into the locking position by the spring force of the spring element.

The spring element may have a pressure spring and a ball acted upon by it against the actuating element.

Thus a simple and functionally safe spring element may be provided.

The object mentioned at the outset is also attained by a tool holding fixture having a multi-faced inner receptacle and a multi-faced outer receptacle. The multi-faced inner receptacle is configured for connecting to a first tool insert, which is able to be locked to a locking device associated with the tool holding fixture in the multi-faced inner receptacle. The multi-faced outer receptacle is configured for connecting to a second tool insert, which has an inner multi-faced coupling that is able to be slid onto the multi-faced outer receptacle. The locking device has an actuating element which, for unlocking the first tool insert from a specified locking position, is rotatable about a longitudinal axis of the tool holding fixture into a specified unlocking position.

The exemplary embodiments and/or exemplary methods of the present invention are explained in greater detail in the following description on the basis of exemplary embodiments illustrated in the drawings.

DETAILED DESCRIPTION

FIG. 1shows an handheld machine tool100equipped with a tool holding fixture150, which has a housing110having a handle126. According to one specific embodiment, handheld machine tool100is able to be connected mechanically and electrically to a battery pack130for a power supply that is network-independent.

Handheld machine tool100is designed as a rotary blow screwdriver, by way of example. It should be pointed out, however, that the present invention is not limited to battery pack rotary blow screwdrivers, but rather may be used for different electric tool applications in which a tool is put into rotation, e.g. in a screwdriver, a drilling screwdriver, a rotary blow screwdriver etc., independently of whether the electric tool is to be operated network-independently using a battery pack or dependent on a network. In addition, one should point out that the present invention is not limited to motor-driven handheld machine tools, but is generally usable in tools in which tool holding fixture150, described inFIGS. 2 through 9, is able to find application.

In tool housing110, there are situated an electric drive motor114supplied with current by battery pack130, a transmission118and a striking mechanism122. Drive motor114, for example, is able to be operated via a manual switch128, that is, switched on and off, and may be of any desired motor type, for example, an electronically commutated motor or a DC motor. Drive motor114may be controllable or regulatable in such a way that both a reverse operation and specifications in regard to a desired rotational speed are able to be implemented. The method of functioning and the design of a suitable drive motor are sufficiently known from the related art so that, at this place, a further description may be omitted for the purpose of conciseness in the description.

Drive motor114is connected to transmission118, via an associated motor shaft116, which converts a rotation of motor shaft116to a rotation of a drive shaft120that is provided between transmission118and striking mechanism122. This conversion may take place in such a way that drive shaft120rotates with respect to motor shaft116at an increased torque, but decreased rotational speed. Drive motor114is situated illustratively in a motor housing115, and transmission118in a transmission housing119, and motor housing115in housing110, for example.

Striking mechanism122connected to driven shaft120is a turning or rotational striking mechanism, which generates abrupt rotating pulses at high intensity, and transmits them to an output shaft124, such as an output spindle. On output shaft124, tool holding fixture150is provided, which may be configured for accommodating tool inserts, and, according to one specific embodiment, is able to be connected both to a tool insert140having an outer multi-faced coupling142and to a tool insert having an inner multi-faced coupling, such as a socket wrench. Tool insert140is configured, for instance, as a screwdriver bit having an outer multi-faced coupling142, illustratively an eight-faced coupling which, in a suitable inner receptacle (290inFIG. 2) is associated with tool holding fixture150. Such a screwdriver bit as well as a suitable socket wrench are sufficiently known from the related art so that, at this place, a detailed description may be omitted for the purpose of conciseness in the description.

FIG. 2shows output shaft124ofFIG. 1, whose proximal end region202, that is provided with an output cam208, is connected inFIG. 1to striking mechanism122of handheld machine tool100. Tool holding fixture150is provided on output shaft124, and in its distal end region204, illustratively an axial widening220is configured. This may be formed onto tool holding fixture150, and may be configured in one piece with it.

Tool holding fixture150, that is provided with an outer receptacle210and an inner receptacle290is illustratively formed onto output shaft124and may be configured as one piece with it. To outer receptacle210, which may be an elastically deformable retaining element230is assigned and to inner receptacle290an operable locking device240is assigned.

Inner receptacle290is used to accommodate screwdriver bit140ofFIG. 1, and is, for instance, configured according to the type of a multi-faced inner receptacle on the inside of output shaft124, illustratively according to a kind of eight-faced inner profile250. To inner receptacle290, an operable locking device240for locking screwdriver bit140ofFIG. 1is assigned via an operating element244that may be embodied as an operating sleeve.

Outer receptacle210is a multi-faced outer receptacle, which may be a four-faced outer receptacle which, as seen in the radial direction, has illustratively four preferably flat side surfaces261,272,263,264, and, according to one specific embodiment, is configured to accommodate a tool insert manufactured according to European or North American industry standards, having an inner multi-faced coupling, such as a socket wrench. Side faces261,262,263,264are connected to one another via beveled edges, for instance, faces261and262are connected to each other via a beveled edge251, and faces262and263are connected via a beveled edge253. The beveled edges, on their part, have beveled end regions towards axial widening220, e.g. edges251,253have beveled end regions252and254respectively. Axial widening220has a closing collar222, which has a conically shaped beveled end224in the distal direction of output shaft124.

Retaining element230, that is fastened on axial widening220, is configured to fasten a suitable tool insert having inner multi-faced coupling on tool holding fixture150. This illustratively has a retaining element234configured as an elastic, deformable metallic C ring.

FIG. 3shows output shaft124with tool holding fixture150and axial widening220, as well as retaining element230and locking device240ofFIG. 2.FIG. 3is there to illustrate an exemplary assembly of retaining element230and locking device240to tool holding fixture150, that is provided with inner receptacle290and outer receptacle210, and output shaft124. As may be seen inFIG. 3, beveled edges255and257are provided between side faces263and264and264and261of outer receptacle210. These have beveled end regions256and258, respectively.

According to one specific embodiment, starting from output cam208in the direction of distal end region204, output shaft124has a first, which may be cylinder-shaped section304, having a first diameter D1. At a first shoulder303, shaft124tapers down and goes over into a second cylindrical section302, having a second diameter D2, where D2<D1. At a second shoulder399, output shaft124tapers down some more and goes over into outer receptacle210which, in turn, goes over at a third shoulder398into axial widening220. In the vicinity of first shoulder303, at second cylinder-shaped section302, a first radial opening326is configured illustratively. In the vicinity of second shoulder399, at section302, at least one second radial opening315is configured, to which, for example, a third, diametrically oppositely situated opening316is assigned. In the region between second shoulder399and outer receptacle210, at least one groove-like recess286is configured. Four groove-like recesses may be provided, of which only recesses286,287,288are visible inFIG. 3, which are each configured between second shoulder399and associated, beveled edges253,255and257. At axial widening220, between third shoulder398and closing collar222, an outer groove-like recess is configured in the form of an annular groove330.

Let it be pointed out that the distance between opposite beveled edges, for instance, between edges253and257, which may be correspond to about diameter D2of second section302of output shaft124, so that between these beveled edges253,257and second shoulder399the abovementioned groove-like recesses286and288are configured. The distance between opposite side faces of four-edge outer receptacle210, i.e. the distance between side faces261and263or the distance between side faces262and264, for example, is smaller than diameter D2, and probably specified in such a way that, between side faces261,262,263,264and shoulder399, no recesses are configured. It is also possible, however, also to develop groove-like recesses between side faces261,262,263,264and shoulder399, which, in addition, are able to form an annular groove, for example, with groove-like recesses286,287,288.

According to one specific embodiment, locking device240has actuating sleeve244, a blocking element242configured like a bolt, a retaining element246configured as a C ring, for example, a spring element325having a pressure spring327and a ball328, as well as four balls311,312,313,314. Actuating sleeve244has illustratively an inner circumference341at which, according to one specific embodiment, two unlocking recesses345(and545inFIGS. 5, 7 and 8), a recess342and a groove (428inFIGS. 4, 6, 7 and 9) are provided, whose functionality is described below, atFIGS. 4 through 9. Pressure spring327and ball328are able to be introduced into opening326, balls311,312into opening315, and balls313,314into opening316of output shaft124. Pressure spring327together with ball328and balls311,312,313,314are retained by actuating sleeve244, which is able to be slid onto output shaft124in the direction of output cam208, in openings326,315and316, respectively, which is shown below atFIG. 4.

In the case of an exemplary assembly of locking device240, at tool holding fixture150or output shaft124, after introducing pressure spring327and ball328as well as balls311,312,313,314into openings326,315and316respectively, first blocking bolt242, as described below forFIG. 5, then actuating sleeve244and finally retaining C-ring246that is provided with radial widenings247,248,249are slid on in the direction of output cam208in such a way that retaining C ring246engages in the groove-like recesses286,287,288. Consequently, radial widenings247,248,249block actuating sleeve244and fix locking device240on output shaft124.

It is pointed out, however, that the use, described within the scope of the exemplary embodiments and/or exemplary methods of the present invention, of locking device240, according to the exemplary embodiments and/or exemplary methods of the present invention, with tool holding fixture150ofFIG. 3has only an exemplary character, and should not be understood to be a restriction on the invention. Rather, locking device240may be used in conjunction with different tool holding fixtures, for instance, with the various tool holding fixtures shown in DE 10 2010 002 352 A1 and DE 10 2010 002 353 A1.

According to one specific embodiment, retaining element230has metallic C ring234ofFIG. 2, and a spring element334, which may be configured as an O ring, of an elastic rubber material. This is used in order, after the assembly, to act upon C ring234radially, using a specified spring force. For the assembly of retaining element230on axial widening220, elastic O ring334is first pushed or pressed over closing collar222into annular groove330. Then metal C ring234is situated radially over O ring334, for instance, by sliding it on over closing collar222.

FIG. 4shows an array400having output shaft124, tool holding fixture150and axial widening220ofFIG. 2after an assembly, described above in connection withFIG. 3, of locking device240and retaining element230ofFIG. 3. In this instance, locking device240is shown in an associated locking position, in which balls311,312,313,314are pressed radially inwards into openings315and16, respectively by inner circumference341of actuating sleeve244. In order to move locking device240from the locking position into an unlocking position, actuating sleeve244has to be rotated in the direction of an arrow450, as is described below, in the case ofFIGS. 5 and 6.

As may be seen inFIG. 4, actuating sleeve244, according to one specific embodiment, is situated coaxially with a longitudinal axis499of tool holding fixture150and axially immovable between first shoulder303and retaining C ring246, but rotatable about the longitudinal axis499in and against the direction of arrow450. In a groove428that is configured on inner circumference341of sleeve244, ball328of spring element325is situated, at least in sections. Spring element325, opening326and groove428form a resetting device according to a first specific embodiment.

FIG. 5shows array400ofFIG. 4with balls311,312and313,314, respectively, situated in openings315,316, pressed radially inwards in the direction of eight-faced inner profile250by inner circumference341of actuating sleeve244. Blocking bolt242, on the one hand, is situated, in sections, in a recess542provided on second section302of output shaft124ofFIG. 3, and on the other hand, in sections, in recess342provided on actuating sleeve244. At this recess, two shoulder-like stopping elements541,543are configured, which are used to prevent a rotation of actuating sleeve244beyond the specified locking position or the specified unlocking position. In the locking position shown inFIG. 5, stopping shoulder543lies against blocking bolt242.

In the case of a rotation of actuating sleeve244in the direction of arrow450, recess342is moved over blocking bolt242until stopping shoulder541stops against bolt242, and thus the unlocking position is reached. In this instance, unlocking recess345configured on inner circumference341of sleeve244and an additional unlocking recess545also configured on the same are positioned over balls314and311, respectively, as described below forFIG. 8.

FIG. 6shows spring element325of array400ofFIG. 4, in which pressure spring327presses ball328in the direction of an arrow666into a position provided, according to one specific embodiment, maximally radially outwards into groove428configured on actuating sleeve244, which corresponds to the locking position of locking device240ofFIG. 4. At this point, ball328lies against an illustratively shoulder-type stop628that is configured on groove428. When actuating sleeve244is rotated in the direction of arrow450, groove428is moved over ball328until ball328is pressed into opening326against the force of pressure spring327into a position, according to one specific embodiment, that is provided to be maximally radially inwards, as is described below forFIG. 9.

FIG. 7shows array400ofFIG. 4after a rotation of actuating sleeve244in the direction of arrow450ofFIG. 4into an associated unlocking position, in which balls311,312,313,314situated in openings315and316, respectively are able to be displaced radially outwards in such a way that balls311,314are able to engage, at least in sections, with unlocking recesses545and345, respectively, that are provided on inner circumference341of actuating sleeve244. In order to move locking device240from the locking position back into an unlocking position shown inFIG. 4, actuating sleeve244has to be rotated in the direction of an arrow750, as is described below, in the case ofFIGS. 8 and 9. In addition,FIG. 7shows the position provided, according to one specific embodiment, maximally radially inwards of ball328pressed into opening326against the force of pressure spring327.

FIG. 8shows array400ofFIG. 7having unlocking recesses545and345, respectively, situated in the area of balls311,314, as well as of stopping shoulder541lying against bolt242. In this instance, balls311,312,313,314are able to be displaced, for introducing or removing a suitable tool insert having an outer multi-faced coupling, e.g. a tool insert140having an outer multi-faced coupling142ofFIG. 1, radially outwards in the direction of associated unlocking recesses545and345, respectively.

As may be seen inFIG. 8, actuating sleeve244has been rotated, starting from the locking position shown inFIGS. 4 through 6, by an angle of rotation888, into the unlocking position. This angle of rotation888is specified by an extension of recess342, in the circumferential direction, that is configured on the inner circumference341of actuating sleeve244, and preferably amounts to less than 180°, which may be less than 90°, and especially preferably less than 45°. In the specific embodiment shown, angle of rotation888is illustratively about 40°.

FIG. 9shows the position provided, according to one specific embodiment, maximally radially inwards of ball328pressed into opening326against the force of pressure spring327, in the direction of an arrow999. According to one specific embodiment, a user of handheld machine tool100ofFIG. 1has to block or retain actuating sleeve244in this unlocking position, in order to prevent automatic rotation of sleeve244into the locking position shown inFIG. 4. When the user releases actuating sleeve244, pressure spring327presses ball328in a direction opposite to arrow999, i.e. in the direction of arrow666ofFIG. 6, in such a way that groove428is moved over ball328until ball328stops against shoulder-like stop628, as was described above forFIG. 6. Actuating sleeve244is thus moved automatically from the locking position into the unlocking position.

FIG. 10shows an enlarged cutout1000of array400ofFIG. 7having a resetting device1025provided on it, according to a second specific embodiment, which may have application instead of spring element325ofFIG. 7that is situated in opening326ofFIG. 7and cooperates with groove428. Resetting device1025has a spring element1050illustratively configured as a pressure spring which, for example, is situated in a first groove-like recess1010provided in second section302of output shaft124as well as a second groove-like recess1044provided in actuating sleeve244. In an alternative embodiment variant, spring element1050is configured as a tension spring.

FIG. 11shows array400ofFIG. 7executed with resetting device1025ofFIG. 10, in which actuating sleeve244is rotated illustratively into the unlocking position. In this unlocking position actuating sleeve244has to be held against a pressure force applied by pressure spring1050, as described below.

Pressure spring1050is situated, as described above in connection withFIG. 10, in first groove-like recess1010provided on output shaft124and second groove-like recess1044provided on actuating sleeve244. First groove-like recess1010has at its ends, in the longitudinal direction, for example, a fastening shoulder1111and an opposite shoulder1113. Second groove-like recess1044has at its ends, in the longitudinal direction, for example, a fastening shoulder1143and an opposite shoulder1141. On fastening shoulder1111,1143, an axial end of pressure spring1050is fastened illustratively in each case, in order thus to achieve improved stability of resetting device1025.

It should be pointed out, however, that pressure spring1050may also be situated unfastened in recesses1010,1044, as long as it is ensured, for instance, that, during operation of handheld machine tool100ofFIG. 1, it cannot slip exclusively into one of recesses1010,1044or be pressed in. This may be prevented, for example in that the diameter of pressure spring1050is selected to be comparatively large with respect to a height of recesses1010and1044.

According to one specific embodiment, pressure spring1050is compressed in the unlocking position between fastening shoulders1111,1143. When actuating sleeve244is released, pressure spring1050expands and this effects a rotation of actuating sleeve244relative to output shaft124in the direction of an arrow1150, in the case of which actuating sleeve244is moved into the locking position shown inFIG. 12.

FIG. 12shows the sectional view ofFIG. 11, in which actuating sleeve244has rotated illustratively, by the expansion of pressure spring1050, automatically in the direction of arrow1150ofFIG. 11into the locking position. In this locking position, actuating sleeve244is held by the pressure force applied by expanded pressure spring105. By rotating actuating sleeve244against the pressure force of pressure spring1050in the direction of an arrow1250, actuating sleeve244may then be moved again into the unlocking position shown inFIG. 11. In this instance, rotating actuating sleeve244is possible by only a specified angle of rotation, such as angle of rotation888ofFIG. 8, as described above forFIG. 8.

FIG. 13shows an enlarged cutout1300of array400ofFIG. 4having a resetting device1325provided on it, according to a third specific embodiment, resetting device1325being able to find application instead of spring element325ofFIG. 4that is situated in opening326ofFIG. 4and cooperates with groove428. Resetting device1325has a spring element1350illustratively configured as a torsion spring which, for example, is situated in a first groove-like recess1322provided in second section302of output shaft124as well as a second groove-like recess1344provided in actuating sleeve244.

According to one specific embodiment, slipping is prevented of torsion spring1350in the direction of first section304of output shaft124in the operation of handheld machine tool100ofFIG. 1or in response to unlocking of actuating sleeve244, illustratively by a supporting disk1310. The latter is supported on shoulder303between first and second section304and302, respectively, of output shaft124in the area of a stepping1320. Stepping1320forms a transition from shoulder303to groove-like recess1322.

FIG. 14shows an exemplary specific embodiment of supporting disk1310and torsion spring1350ofFIG. 13. Supporting disk1310is configured illustratively to be annular. Between its first spring end1452and its second spring end1454, torsion spring1350illustratively spans an angle of about 450°. It should be pointed out, however, that the representation of an angle of 450° only has an exemplary character, and is not used to restrict the exemplary embodiments and/or exemplary methods of the present invention. Rather, the latter may be executed having a plurality of different torsion springs, which include a plurality of different angles, as long as the functionality described below forFIG. 15is assured.

FIG. 15shows array400ofFIG. 4executed with resetting device1325ofFIG. 13, in which actuating sleeve244is rotated illustratively into the unlocking position. Actuating sleeve244is able to be rotated from this locking position into the unlocking position against a resetting force applied in the direction of an arrow1550.

As may be seen inFIG. 15, torsion spring1350is supported, in the locking position of actuating sleeve244, essentially in first groove-like recess1322that is provided in second section302of output shaft124, first spring end1452lying illustratively against a first retaining shoulder1522, which is configured in a depression1517provided in recess1322. In addition, torsion spring1350is situated in sections in second groove-like recess1344that is provided in actuating sleeve244, second spring end1454lying illustratively against a second retaining shoulder1543, which is configured in an elevation1546provided in recess1344.

According to one specific embodiment, when actuating sleeve244is rotated from the locking position in the direction of arrow1550, second spring end1454is displaced from second retaining shoulder1543in the direction of arrow1550. Because of this, torsion spring1350widens out radially into groove-like recess1344and consequently is loaded or stressed until actuating sleeve244reaches the unlocking position, In this instance, rotating actuating sleeve244is possible by only a specified angle of rotation, such as angle of rotation888ofFIG. 8, as described above forFIG. 8. When actuating sleeve244is released, as a result, it is able to be moved back by the resetting force of stressed torsion spring1350into a direction, opposite to arrow1550, into the locking position shown inFIG. 15.