DE102016100659B3 - Cross tables with attachment device for coaxial control unit and microscope - Google Patents

Abstract

A cross table with an attachment device (100) for a coaxial operating unit (200) and a coaxial operating unit (200) attached to the attachment device (200) is proposed. It is provided that the attachment device (100) has a coaxially inner inner shaft (110) with a first engagement structure (111) and a hollow shaft (120) coaxially surrounding the inner shaft (110) with a second engagement structure (121), that the coaxial control unit ( 200) has a coaxially inner inner shaft (210) with a first counter-structure (211) and a hollow shaft (220) coaxially surrounding the inner shaft (210) with a second counter-structure (221) formed by the first engagement structure (111) and the first counter-structure (211) is formed by a train releasable first non-rotatable coupling (310), and in that by the second engagement structure (121) and the second counter-structure (221) is formed by a non-train train non-rotatable coupling (320), which at the same time a release the first clutch (310) prevented by train. A corresponding cross table (10) with one or more attachment devices (100) for mounting a coaxial operating unit (200) and a corresponding microscope (1) are likewise provided by the invention.

Description

The invention relates to a cross table with one or more attachment devices for a coaxial control unit and a corresponding microscope according to the preambles of the independent claims.

A cross table, in particular for a microscope, typically has a base unit which is immovable relative to a stand and two slides which are movable in each case in a horizontal direction. To move the carriages Koaxialtriebe may be provided which have a coaxial inner inner shaft and a hollow shaft coaxially surrounding the inner shaft. The inner shaft and the hollow shaft are in each case rotatably connected to control elements, in particular knurled drive knobs, by means of which rotational movements in each case into the inner shaft and the hollow shaft can be initiated. About each with the inner shaft and the hollow shaft rotatably connected output means, such as pinion or pulleys, these rotational movements can be implemented in linear drives in linear movements to move the carriage.

Coaxial drives may further comprise a coaxially surrounding the inner shaft and coaxially surrounded by the hollow shaft support sleeve, which is rotationally rigidly connected to the base unit of the cross table, and which supports the torques generated by the rotational movements of the inner shaft and the hollow shaft. Corresponding coaxial drives have long been known and, for example, in the DE 30 27 461 C2 or the DE 102 46 276 B4 shown.

A fatigue-free working with a coaxial drive for a long time can be ensured in particular by the fact that the user's hand during operation rests essentially on a footprint of the microscope or a dedicated hand rest and this the controls of the coaxial drive, for example with the thumb and pointing - and / or middle finger, attacks. Due to different hand sizes, preferred hand postures and possibly deviating operating habits, however, it is scarcely possible in practice to define a position of the operating elements perceived by all users of a microscope as being comfortable. Since the position of the controls is determined inter alia by the length of the inner shaft and the hollow shaft, this can not be changed easily.

Corresponding problems may also arise when the cross table, for example due to modifications to the microscope, is temporarily brought into a significantly higher or lower position than those for which the coaxial drive was originally provided. In this case, if necessary, the operating elements of the coaxial drive can no longer be achieved in the above-described fatigue-free manner by the hand of the user.

Finally, it is also possible that different users, for example, also due to different hand sizes and / or finger forces, control elements of different sizes and configurations considered to be particularly comfortable. However, the controls can not be readily separated from their respective shafts and replaced. Such as in the DE 10 2004 055 397 A1 described, certain user groups also prefer to operate a cross table completely without a coaxial drive. For these user groups, the coaxial drive proves to be a hindrance altogether. For left-handers also mounted for right-handers on the right side of the cross table coaxial drive is difficult to operate.

The problems outlined above can in principle be addressed by providing coaxial control units of coaxial drives of different lengths or configurations and providing a means for exchanging them, and / or by providing a means of attaching such coaxial control units to or from different locations of a stage.

The DE 10 2004 055 397 A1 proposes a corresponding removable coaxial control unit.

A "coaxial control unit" is to be understood here as a unit which comprises a part of a coaxial drive, in particular the inner shaft and the hollow shaft or certain sections thereof, but in particular separated from the linear drives driven by the coaxial drive or without complex mechanical interventions, in particular by a User, is separable from these. A coaxial control unit also carries in particular the previously described controls.

In particular, when using pinions as output means, which mesh with corresponding racks of a linear drive, however, there may be problems when replacing a coaxial control unit. Typically, to ensure a play-free smooth running of a corresponding arrangement complex adjustment work is required, in particular due to existing in practice tolerances in the production of pinions and racks. In the in the DE 10 2004 055 397 A1 proposed replacement of the coaxial operating units are therefore either expensive Nachjustagearbeiten or very small tolerances required if you want to achieve a backlash-free smooth running. Further, to exchange here tool in the form of a hexagon socket key required.

The DE 11 2013 004 907 T5 describes a manual table for the linear positioning of precision equipment, such as cameras and sensors, optical lenses and microscopes or lighting equipment. It comprises a displaceable component, which is displaced by means of a control knob via a permanently installed drive mechanism, for example a toothed rack, a feed spindle or the like. It describes a motorization unit, which is clamped by means of a clamp on the control knob and is removable again.

In the US 2007/0 151 380 A1 is a microscope stage with two adjustable plates described. The drive comprises a rack for linear adjustment of the plates, a gear engaging therein and a handle mounted on the gear for adjusting the table. The handle can be decoupled from the gear and replaced.

The DE 692 00 553 T2 describes a movable stage. On the shaft of the handle a profile roller is mounted, which actuates a wire cable and reaches a rotation of the handle, a displacement of the table tops. To change the handle, a handle attachment component and the lower table top must be dismantled and then reinstalled and the cable re-established. A simple change of the handle is not possible.

The US 6 369 940 B1 describes a microscope stage whose plates are adjusted via two cables and pulleys. The handle is over pulleys with the cables in non-positive connection. A simple replacement of the handle is therefore not possible.

The DE 35 28 343 A1 describes an xy microscope stage, which in each case has a mechanism with racks and pinions for both adjustment directions and allows smooth fine adjustment. For the change to the coarse positioning an activatable brake mechanism is additionally provided on the handle, which allows a coarse adjustment with the same mechanical means as in the fine adjustment. A change of the handle is therefore not possible.

Against this background, the invention seeks to create a possibility of being able to exchange parts of coaxial drives at cross tables in the form of coaxial operating units simply and without readjustment.

Against this background, the present invention proposes a cross table with one or more attachment devices for a coaxial control unit and a corresponding microscope with the features of the independent claims. Preferred embodiments are the subject of the dependent claims and the following description.

The present invention is based on the finding that in contrast to the example in the DE 10 2004 055 397 A1 proposed separation of a coaxial control unit of a cross table between the rack of the cross table or a corresponding linear drive and the associated pinion a division of the inner shaft and the hollow shaft and the coupling of the corresponding parts with each other is particularly advantageous. In the possibility created according to the invention for exchanging corresponding coaxial operating units, no complicated readjustment work is required. In particular, an exchange without additional tools can be carried out here, as also explained in detail below.

The present invention proposes a mechanical stage, in particular for a microscope, with an attachment device for a coaxial operating unit and a coaxial operating unit attached to the attachment device. According to the invention, the attachment device has a coaxially inner inner shaft with a first engagement structure and a hollow shaft coaxially surrounding the inner shaft with a second engagement structure. In contrast to attachment devices according to the prior art, as for example in the DE 2004 055 397 A1 be proposed, therefore, the invention proposed attachment device itself has corresponding shaft sections which engage permanently in the associated linear drives even with removal of the coaxial control unit.

The shaft sections of the attachment device or attached to these output means such as pinion or pulleys must therefore not be separated from the cross table or the corresponding counter-structures of a linear drive when changing a Koaxialbedieneinheit. In this way, these elements can remain permanently in their, for example, factory adjusted, position and when changing the coaxial control unit no readjustment work is required. The invention always ensures in this way a backlash-free transmission of the rotational movement of a coaxial drive or the associated linear drives without readjustment.

The engagement structures in the attachment device are opposite to the output means, which engage in the corresponding linear drives on each other end of the inner shaft and the hollow shaft attached. In particular, the second engagement structure of the hollow shaft can surround the first engagement structure of the inner shaft coaxially, as also explained below.

As mentioned, a coaxial control unit can be attached to the attachment device. The coaxial control unit also comprises a coaxially inner inner shaft and a hollow shaft coaxially surrounding the inner shaft. The inner shaft of the coaxial control unit has a first counter-structure and the hollow shaft of the coaxial control unit has a second counter-structure. The first engagement structure and the first counterstructure are each designed such that upon engagement of the first engagement structure and the first counterstructure by the latter, a first non-rotatable coupling which can be released by tension or axial movement apart is formed. On the other hand, the second engagement structure and the second counterstructure are designed in such a way that, upon engagement of the second engagement structure and the second counterstructure, a second non-rotatable coupling, which is not detachable by tension, is formed. The second clutch prevents at the same time a release of the first clutch by train or axial movement apart.

By train detachable non-rotatable couplings are known from the prior art in different configurations. A coupling is "by train" or "by axially moving apart" solvable when their coupling structures, in the present case, the first engagement structure and the first counter-structure, can be disengaged only by axially moving apart along the axes of rotation of the corresponding shafts. The coupling elements are, in other words, not tensile strength connected. Appropriate couplings are known in the art as "axially movable" couplings. A well-known example of an axially movable coupling is a dog clutch which can only be separated by moving the jaw members apart.

In the context of the present invention, the inner shafts of the attachment device and the coaxial control unit are axially immovable relative to the respective hollow shafts, i. Although they can be rotated relative to the hollow shafts about their axis of rotation, but not translate or only to a limited extent along the axis of rotation translationally. Is therefore formed between the second engagement structure of the hollow shaft of the attachment device and the second counter-structure of the hollow shaft of the coaxial control unit by a train non-releasable second non-rotatable coupling coaxially surrounding the first clutch, this can also be a movement apart of the first counter-structure of the inner shaft of the attachment device and the prevent first counter-structure of the inner shaft of the coaxial control unit. A corresponding first clutch can therefore be kept in engagement or prevented from separating by the second clutch.

This is particularly advantageous because in this way the first clutch can be formed only by telescoping the first engagement structure and the first counter-structure and only the second clutch must be formed to make a solid connection. In this way, a simple and in particular tool-free connection of a coaxial control unit with a corresponding attachment device is possible.

As mentioned, in known cross tables an inner shaft may be surrounded by a support sleeve, which in turn is surrounded by the hollow shaft. Even with such cross tables, the present invention can be used. In this case, the attachment device advantageously comprises a support sleeve coaxially surrounding its inner shaft and coaxially surrounded by its hollow shaft with a third engagement structure. In this case, the coaxial operating unit comprises a supporting sleeve coaxially surrounding its inner shaft and coaxially surrounded by its hollow shaft with a third counter-structure. The inner shaft and the outer shaft are each independently rotatable within or outside the support sleeve, but not or hardly axially displaceable to this. If a corresponding coaxial operating unit is attached to an attachment device, the third engagement structure and the third counterstructure form a third non-rotatable coupling which can be released by tension, the release of which by train likewise prevents the second rotationally fixed coupling.

For the third non-rotatable coupling apply substantially the above explanations to the first non-rotatable coupling on. In particular, the third engagement structure may coaxially surround the first engagement structure. The third engagement structure can simultaneously be arranged coaxially within the second engagement structure. The same applies to the respective counterstructures. Thus, the second clutch, the third clutch and this in turn surround the first clutch coaxially.

The present invention thus makes it possible to connect all of the said mechanically relevant components of a coaxial drive in a simple and tool-free manner, namely merely telescoping the elements of the first and third clutches and fastening the second clutch.

For a particularly simple production of the first and third coupling, the first engagement structure and the first counter-structure and / or the third engagement structure and the third counter-structure, if present, advantageously each complementary grooves and tongues, projections and recesses and / or perforations. In principle, all known mechanical structures which prevent a mutual rotational movement of said elements relative to one another when they are engaged are fundamentally suitable here. In particular, in the context of the present invention, the first engagement structure and the first counterstructure may be in the form of a tongue and groove arrangement. During assembly, a user can, for example, "threading" the groove into the spring in a manner that requires simple and no complex optical control. In this case, the third engagement structure and the third counterstructure can advantageously be designed as toothed rings, which engage in one another after the first clutch has been produced. The sprockets align themselves with each other and slide with increasing telescoping under rotation along the axes of rotation of the corresponding support sleeves into each other. A complicated positioning of the third engagement structure and the third counter-structure to each other is therefore no longer required once the first engagement structure and the first counter-structure and the second engagement structure and the second counter-structure were engaged with each other. The first engagement structure and the first counter-structure or the second engagement structure and the second counter-structure position the axes of the shafts and support sleeves of the attachment device axially to each other.

Advantageously, the second engagement structure and the second counterstructure for producing the non-train releasable second coupling comprise mutually complementary threaded elements. For example, in this case a union nut can be provided, which can be screwed onto a thread of the respective other element, in particular if the second engagement structure and the second counter-structure were brought into a position required for producing the second coupling to each other. By appropriate dimensioning and design, such as knurling, a corresponding nut this can be screwed by a user without tools and secured by hand. Due to the relatively low, transmitted via a corresponding coaxial drive forces sufficient such a solid attachment. Of course, if necessary, suitable tools can also be used. The threaded elements are advantageously mounted in such positions that they ensure a secure engagement of the elements of the first and third coupling in a partially or fully screwed state.

The engagement and counter-structures can advantageously also centering, for example, a cone and a corresponding conical bore, which ensure a correct alignment of the axes of the shafts and support sleeves to each other in the preparation of the respective couplings. For example, a thread-bearing second counter-structure may additionally be provided with a corresponding hollow cone, onto which a conical recess in the first engagement structure can be pushed. A center axis of the hollow cone and the conical recess coincides with the axis of rotation of the hollow shafts in the attachment device and the coaxial control unit.

As mentioned, known microscope microscope recesses typically include linear drives, for example with toothed racks and / or cables, which can be driven by means of the coaxial drives. As also mentioned, in an attachment device to a cross table of the present invention, shafts are mounted (the inner shaft and the hollow shaft) connected to respective linear drives or permanently engaged by suitable output means such as pinions and pulleys with corresponding complementary elements of such linear drives. As a result, no readjustment after a change of coaxial operating units is required. It is therefore particularly advantageous if, in a corresponding cross table, a rotational movement can be transmitted to a first linear drive via the inner shafts and rotational movement to a second linear drive of the cross table via the hollow shafts.

Advantageously, in the coaxial control unit, the inner shaft with a first control element and the hollow shaft with a second control element connected, for example in the form of knobs that can be operated by a user. Different coaxial control units can have different lengths and / or be equipped with controls with different geometry and dimension.

In addition to a cross table with an attachment device and a coaxial control unit attached thereto, the present invention also extends to a cross table with an attachment device, which is set up for attaching a corresponding coaxial control unit, but does not carry a corresponding coaxial control unit. An attachable to the attachment coaxial control unit is designed as previously explained, so it has a coaxial inner inner shaft with a first counter-structure and a hollow shaft surrounding the inner shaft coaxial with a second counter-structure. The first engagement structure of the attachment device is for forming a train releasable first non-rotatable coupling with a first counter-structure of the coaxial control unit is set up and the second engagement structure is configured to form a non-train by train second non-rotatable coupling with a second counter-structure of the coaxial control unit. The second clutch prevents a release of the first clutch when the corresponding clutch is made. For features and advantages of a corresponding cross table and said elements is expressly made to the above explanations.

Cross tables which have two or more attachment devices for attaching coaxial operating units, as explained above, are particularly advantageous. In this way, for example, a left- and right-handed operation of a corresponding cross table can be made by either a left or right in an operating position, a corresponding attachment device is provided. For users who want to operate a corresponding cross table completely without coaxial drive, the coaxial control unit can also be completely removed.

For this purpose, as well as to the microscope also proposed according to the invention, which is characterized by a corresponding cross table, should be expressly referred to the above statements.

Further advantages and embodiments of the invention will become apparent from the description and the accompanying drawings. It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

The invention is illustrated schematically with reference to an embodiment in the drawing and will be described below with reference to the drawing.

1 shows an attachment device with a coaxial control unit according to an embodiment of the invention.

2A to 2D show details according to embodiments of the invention.

3A and 3B show cross tables according to embodiments of the invention.

In 1 an attachment device with a coaxial control unit attached thereto is illustrated according to a particularly preferred embodiment of the present invention. The attachment device is a total of 100 , the coaxial control unit in total with 200 designated.

The attachment device 100 is at a base unit 50 a cross table 1 attached, with reference to the 3A and 3B is explained. The attachment device 100 includes an inner inner shaft 110 and a hollow shaft coaxially surrounding the inner shaft 120 , Between the inner shaft 110 and the hollow shaft 120 is a support sleeve in the example shown 130 intended. The support sleeve 130 is non-rotatable in the base unit 50 attached to the cross table. The inner shaft 110 and the hollow shaft 120 are for rotation in or about the support sleeve 130 set up.

On the inner shaft 110 is a first intervention structure 111 formed on the hollow shaft 120 is a second intervention structure 121 formed and on the support sleeve is a third engagement structure 131 educated. In the example shown, the first engagement structure is a groove, the second engagement structure 121 as a carrier for a union nut 122 and the third engagement structure formed as a crown sleeve. The inner shaft 110 is with an output element 112 connected in a linear drive 30 , which is illustrated in simplified form here, intervenes. The hollow shaft 120 is with an output element 123 , For example, a sprocket, provided in a corresponding linear drive 40 intervenes.

The coaxial control unit 200 also includes an inner shaft 210 , a hollow shaft 220 and a support sleeve 230 , With the inner shaft 210 the coaxial control unit 200 is a first counter structure 211 connected to the hollow shaft 220 the coaxial control unit 200 is a second counter structure 221 connected and with the support sleeve 230 the coaxial control unit 200 is a third counter structure 231 connected.

The first counterstructure 211 is here designed as a spring unit, which is formed by the third counter-structure formed as a toothed sleeve 231 is surrounded coaxially. The first counterstructure 211 and the third counterstructure 231 are from the second counterstructure 221 , which are designed here as a threaded unit and with the union nut 122 in screw engageable, trained. By screwing on the union nut 122 on the thread structure of the second counter-structure 221 can the hollow shafts 120 respectively. 220 the attachment unit 100 or the coaxial control unit 200 be connected to each other. By a corresponding connection is at the same time an intervention of the first engagement structure 111 the inner shaft 110 the attachment device 100 into the first counterstructure 211 the inner shaft 210 the coaxial control unit 200 established. The same applies to the third intervention structure 131 the support sleeve 130 the attachment device and the third counter-structure 231 the support sleeve 230 the coaxial control unit.

Through the first intervention structure 111 and the first counterstructure 211 This is a releasable by train coupling 310 manufactured, which is referred to here as "first clutch". Through the third intervention structure 131 and the third counterstructure 231 is a detachable by train coupling 330 manufactured, which is referred to here as "third clutch". A solution of the first and the third clutch by train is by screwing the nut 122 with the second counterstructure 221 the hollow shaft 220 the coaxial control unit 200 prevented. Through the second engagement structure 121 and the second counterstructure 221 or using the union nut 122 is referred to here as a "second clutch", by train not detachable because screwed, coupling 320 produced. The couplings 310 . 320 and 330 are in the 2C and 2D illustrated.

At the explained couplings 310 to 330 facing away from the coaxial control unit 200 Controls on. With the inner shaft 110 the coaxial control unit 200 is a first operating element 212 and with the hollow shaft 220 the coaxial control unit 200 a second control 222 connected. For attaching appropriate fasteners 213 respectively. 214 be provided, which is a rotationally fixed attachment of the controls 212 respectively. 222 cause and at the same time an axial movement of the inner shaft 210 or the hollow shaft 220 opposite the support sleeve 230 prevent. For a better mobility of the hollow shafts 120 respectively. 220 the attachment device 100 and the coaxial control unit 200 opposite the respective support sleeves 130 respectively. 230 can suitable rolling bearings 140 respectively. 240 be provided.

In the 2A to 2D are details of in 1 shown elements shown again, but only partially provided with the corresponding reference numerals. The 2A shows an attachment device 100 , the 2 B a coaxial control unit 200 , the 2C the first clutch 310 and the 2D the third clutch 330 , In the 2A to 2D each elements shown were already referring to the 1 explained so that you can refer to the explanations there.

In the 3A and 3B are each illustrated cross tables according to a preferred embodiment of the invention and in total with 1 designated. An attachment device for a coaxial control unit is also here with 100 and a corresponding coaxial control unit with 200 designated. The cross table 10 comprises a first displaceable unit 10 and a second displaceable unit 20 , each with linear drives, as shown in 1 are illustrated schematically and there with 30 respectively. 40 are designated, can be coupled, and in this way by a coaxial drive or its coaxial control unit 200 can be moved. The units 10 respectively. 20 are movable on a base unit 50 appropriate. 3A shows the cross table 10 with the attachment unit 100 with a coaxial control unit attached thereto 200 , in 3B is the coaxial control unit 200 away.

LIST OF REFERENCE NUMBERS

1

 cross table

30, 40

 linear actuator

10

 first movable unit

20

 second movable unit

50

 base unit

100

 Attachment device for coaxial control unit

200

 Koaxialbedieneinheit

110, 210

 inner shaft

120, 220

 hollow shaft

130, 230

 support sleeve

111

 first intervention structure

112, 123

 output element

121

 second intervention structure

122

 Nut

131

 third intervention structure

140, 240

 roller bearing

211

 first counterstructure

212

 first operating element

213, 214

 fortification

221

 second counterstructure

222

 second operating element

231

 third counterstructure

310

 first clutch

320

 second clutch

330

 third clutch

Claims (9)

Cross table ( 1 ) with an attachment device ( 100 ) for a coaxial control unit ( 200 ) and one to the attachment device ( 100 ) mounted coaxial control unit ( 200 ), characterized in that the attachment device ( 100 ) a coaxially inner inner shaft ( 110 ) with a first engagement structure ( 111 ) and one the inner shaft ( 110 ) coaxially surrounding hollow shaft ( 120 ) with a second engagement structure ( 121 ), that the coaxial control unit ( 200 ) a coaxially inner inner shaft ( 210 ) with a first counterstructure ( 211 ) and one the inner shaft ( 210 ) coaxially surrounding hollow shaft ( 220 ) with a second counterstructure ( 221 ) that by the first engagement structure ( 111 ) and the first counterstructure ( 211 ) a releasable by train first non-rotatable coupling ( 310 ) is formed, and that by the second engagement structure ( 121 ) and the second counterstructure ( 221 ) one by train not detachable second non-rotatable coupling ( 320 ) is formed, which at the same time a release of the first clutch ( 310 ) prevented by train. Cross table ( 1 ) according to claim 1, wherein the attachment device ( 100 ) an inner shaft ( 110 ) coaxially surrounding and through the hollow shaft ( 120 ) coaxially surrounded support sleeve ( 130 ) with a third engagement structure ( 131 ), in which the coaxial control unit ( 200 ) an inner shaft ( 210 ) coaxially surrounding and through the hollow shaft ( 220 ) coaxially surrounded support sleeve ( 230 ) with a third counter-structure ( 231 ), and in which by the third engagement structure ( 131 ) and the third counterstructure ( 231 ) a train releasable third non-rotatable coupling ( 330 ) is formed, the release by train also the second non-rotatable coupling ( 320 ) prevented. Cross table ( 1 ) according to claim 2, wherein the first engagement structure ( 111 ) and the first counterstructure ( 211 ) and / or the third intervention structure ( 131 ) and the third counterstructure ( 231 ) each have mutually complementary grooves and tongues, projections and recesses and / or perforations. Cross table ( 1 ) according to one of the preceding claims, in which the second engagement structure ( 121 ) and the second counterstructure ( 221 ) complementary thread elements ( 122 ) exhibit. Cross table ( 1 ) according to any one of the preceding claims, wherein via the inner shafts ( 110 . 210 ) a rotational movement on a first linear drive ( 30 ) and the hollow shafts ( 120 . 220 ) a rotary motion to a second linear drive ( 40 ) of the cross table ( 1 ) is transferable. Cross table ( 1 ) according to one of the preceding claims, in which the inner shaft ( 210 ) of the coaxial control unit ( 200 ) with a first control element ( 212 ) and the hollow shaft ( 220 ) of the coaxial control unit ( 200 ) with a second operating element ( 222 ) are rotatably connected. Cross table ( 1 ) with an attachment device ( 100 ) for attaching a coaxial control unit ( 200 ), characterized in that the attachment device ( 100 ) a coaxially inner inner shaft ( 110 ) with a first engagement structure ( 111 ) and one the inner shaft ( 110 ) coaxially surrounding hollow shaft ( 120 ) with a second engagement structure ( 121 ), that the first engagement structure ( 111 ) for forming a train-releasable first non-rotatable coupling ( 310 ) with a first counterstructure ( 211 ) and that the second intervention structure ( 121 ) for forming a non-train by second non-rotatable coupling ( 320 ) with a second counterstructure ( 221 ), which is a release of the first clutch ( 310 ) prevented by train. Cross table ( 1 ), characterized by two or more attachment devices ( 100 ) for attaching coaxial control units ( 200 ) according to the characterizing part of claim 7. Microscope, characterized by a cross table ( 1 ) according to any one of the preceding claims.

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