Pipetting device and method for assembling a pipetting device

Abstract

The invention relates to a pipetting device for aspirating and dispensing fluid volumes. The pipetting device has a housing with a base body that encloses a cavity and has an inner surface defining the cavity, an outer surface, and an opening. The pipetting device includes an assembly assembly comprising several components of the pipetting device. The assembly assembly can be inserted into the cavity of the base body through the opening of the base body for assembly and, in the assembled state, is arranged within the cavity of the base body and detachably attached to the base body. A first guide element is formed on the inner surface of the base body. A second guide element is formed on the assembly assembly. At least temporarily during the assembly of the assembly assembly and in the assembled state, the first guide element engages with the second guide element.

Description

[0001] The invention relates to a pipetting device for taking up and dispensing fluid volumes or for handling liquid, and to a method for assembling a pipetting device.

[0002] Pipetting devices are generally known from the prior art. A typical pipetting device comprises a housing and a multitude of components, at least partially located within the housing. Pipetting devices are precision instruments in which the various components must be manufactured and assembled with great accuracy. During the assembly of a pipetting device, it is crucial that the various components are positioned correctly to ensure reliable and error-free operation of the device and high accuracy when pipetting, especially with very small fluid volumes.

[0003] It is therefore important to ensure the precise positioning of the various components of the pipetting device during assembly. Furthermore, for an efficient and cost-effective manufacturing process, it is desirable to automate and / or simplify the assembly of the pipetting device as much as possible, and to eliminate any potential sources of error that could lead to incorrect assembly or even damage during assembly.

[0004] It is therefore an object of the present invention to provide a solution by which the assembly of a pipetting device can be optimized, in particular so that the assembly can be carried out as automatically, quickly, easily and / or without errors as possible.

[0005] The above problem is solved by a pipetting device according to claim 1 or a method according to claim 21. Advantageous further developments are the subject of the dependent claims.

[0006] The pipetting device according to the invention is designed for aspirating and dispensing fluid volumes and comprises a housing and an assembly. The housing has a base body that encloses a cavity and has an inner surface defining the cavity, an outer surface, and an opening. The assembly comprises several components of the pipetting device. The assembly can be inserted into the cavity of the base body through the opening for assembly. In the assembled state, the assembly is arranged in the cavity of the base body and detachably attached to the base body.

[0007] A first guide device is formed on the inside of the base body, and a second guide device is formed on the assembly unit. The first guide device engages with the second guide device at least temporarily during the assembly of the assembly unit and in the assembled state.

[0008] The guide devices facilitate the assembly of the pipetting device or assembly unit. In particular, the guide devices can prevent assembly errors. In other words, the guide devices preferably facilitate or ensure correct assembly.

[0009] The pipetting device preferably has the following features: A displacement device, in particular a piston-cylinder arrangement, comprising a displacement means, in particular a piston, and a displacement housing, in particular a cylinder; a drive device for moving the displacement means in the displacement housing, wherein a movement of the displacement means is limited by an upper stop, a lower stop and at least one counter-stop of the drive device and / or the displacement means, so that a stroke of the displacement means is defined; a volume indicator for displaying a pipetting volume associated with or correlating to the stroke of the displacement means; an adjustment device designed for changing the stroke of the displacement means, in particular for changing the position of the upper stop; and an adjustment indicator for displaying an adjustment value of the stroke of the displacement means.

[0010] The assembly preferably includes at least one component of the volume indicator and / or at least one component of the adjustment device and / or at least one component of the adjustment indicator. Providing such an assembly simplifies the assembly of the pipetting device.

[0011] The first and second guide devices preferably define an insertion path for inserting the assembly into the base body, such that insertion of the assembly along any path other than the defined insertion path is blocked or prevented, and / or the assembly can only be inserted into the base body along the defined insertion path. In other words, the insertion path defined by the first and second guide devices is preferably the only path along which the assembly can be mounted or inserted into the base body. The guide devices thus preferably provide positive guidance for the assembly. This prevents incorrect assembly, for example, due to incorrect arrangement or alignment of parts of the pipetting device during assembly.

[0012] The first guiding device preferably comprises a guide rail, in particular elongated and / or running parallel to a longitudinal axis of the pipetting device or the housing or base body, for guiding the assembly during assembly. The guide rail is particularly designed as a raised section on the inside of the base body. This facilitates easy guidance of the assembly during assembly.

[0013] Particularly preferably, the first guiding device has two preferably identical guide rails for guiding the assembly during assembly, wherein the guide rails are arranged opposite each other. In particular, the guide rails are arranged symmetrically or as mirror images, especially with respect to a longitudinal axis of the pipetting device or the housing. This improves the guidance of the assembly during assembly.

[0014] The first guide device preferably includes a stop element. The stop element is preferably angled. This preferably creates stops in several directions, so that at the end of the assembly or after assembly has been completed, the assembly is fixed or positively secured in several directions by the stop element.

[0015] It is preferred that the stop element forms or has a center of rotation for the assembly, or that the stop element forms or has a preferably horizontal axis of rotation for the assembly. In particular, it is provided that when the assembly is inserted into the base body or when the assembly is mounted, the assembly rotates around the stop element. Here, the stop element forms a center of rotation for the assembly or an axis of rotation for the assembly. The term "axis of rotation" is to be understood here as referring to a virtual or imaginary axis around which the assembly rotates. A "horizontal" axis of rotation is understood to mean, in particular, an axis of rotation that runs perpendicular to a longitudinal axis of the pipetting device or the housing.

[0016] The first guide device preferably comprises two stop elements, preferably identical in design, arranged opposite each other. The stop elements are preferably arranged symmetrically or as mirror images, particularly with respect to a longitudinal axis of the pipetting device or the housing.

[0017] The first guide device preferably forms a channel into which at least a part of the second guide device, in particular a first guide contour of the second guide device, can be inserted, preferably wherein the channel is formed between the guide rail and the stop element. The channel facilitates the insertion of the assembly into the base body and ensures error-free assembly of the assembly.

[0018] The second guide device preferably forms a channel into which at least a part of the first guide device, in particular the guide rail of the first guide device, can be inserted, preferably wherein the channel is formed between a first guide contour and a second guide contour of the second guide device. The channel facilitates the insertion of the assembly into the base body and ensures error-free assembly of the assembly.

[0019] Preferably, the first and second guide elements each form a channel into which at least a part of the other guide element can be inserted. In this way, an insertion path for inserting the assembly into the housing or base body is defined, particularly in the form of positive guidance. In other words, the channels specify the path along which the assembly must or can be inserted into the base body. This simplifies assembly, as it is only possible by moving the assembly along the path defined by the channel(s), thus preventing incorrect assembly or the mounting of components in the wrong orientation or position.

[0020] It is preferred that the second guide device has at least one first guide contour, at least one second guide contour, and at least one third guide contour for guiding the assembly along the guide rail of the first guide device. The guide contours enable precise guidance of the assembly, thereby preventing assembly errors.

[0021] Preferably, the first guide contour is spaced apart from the second guide contour to allow the guide rail to pass between them. It is particularly preferred that the second guide contour has a first contact area for the guide rail during assembly, and that the first guide contour has a second contact area for the guide rail during assembly. In particular, the space between the first and second guide contours forms a channel or insertion path for the assembly. The different contact areas for the guide rail define and effect different movements during the insertion of the assembly and / or prevent unwanted movements. This ensures that the necessary movements of the assembly occur automatically when the assembly is guided.The assembly group is guided accordingly.

[0022] In particular, the second guide contour is connected to the third guide contour or formed as a single piece. This facilitates a simple design.

[0023] The stop element preferably forms a first stop for the second guide device, in particular for the first guide contour. It is especially preferred that the first guide contour can be placed on the first stop, particularly if the first stop limits the insertion path of the assembly. This ensures correct and precise guidance and positioning of the assembly.

[0024] Furthermore, the stop element preferably forms a second stop for the second guide device, in particular for the first guide contour. It is especially preferred that the first guide contour is pivotable against the second stop. In particular, the second stop defines an end position of the assembly.

[0025] In the assembled state of the assembly, the stop element preferably forms a positive fit with the second guide device, in particular with the first guide contour of the second guide device. Preferably, the positive fit blocks relative movement between the stop element and the second guide device, and thus between the assembly and the base body, in the axial direction (especially with respect to the longitudinal axis of the pipetting device or housing) and / or in the circumferential direction. In particular, the first guide contour engages the stop element. The positive fit or engagement of the stop element with the first guide contour preferably determines the position of the assembly or fixes the assembly in the housing or base body. Thus, the guide devices not only prevent the insertion of the assembly or theThis not only facilitates correct assembly but also secures the assembly during or after assembly. This eliminates the need for additional fixing or fastening devices, or reduces or prevents displacement of the assembly within the base body before or during (additional) fixing by a fastener such as a screw or similar.

[0026] The first guide contour, when the assembly is mounted, preferably rests against the first stop and the second stop. This secures the assembly in multiple directions.

[0027] Furthermore, in the assembled state of the assembly, the guide rail preferably forms a positive fit with the second guide device, in particular wherein the guide rail bears at least partially against the first guide contour, the second guide contour and the third guide contour, thereby preferably fixing the assembly in the base body.

[0028] Preferably, the assembly is connected to the housing, particularly to the connecting part, by a fastening element, in particular a screw, a pin, or a rivet, when assembled. The fastening element, in particular, blocks relative movement between the assembly and the base body in the radial and / or axial and / or circumferential direction.

[0029] According to a further aspect, which can also be implemented independently, the present invention relates to a method for assembling a pipetting device, comprising the steps a) Providing a pipetting device, which is designed in particular as described herein, b) Inserting the assembly through the opening of the base body into the cavity of the base body, c) Engaging the second guide device with the first guide device, d) Moving the assembly along the first guide device until the second guide device rests on a stop of the first guide device, and e) Rotating the assembly about a preferably horizontal axis of rotation into an end position of the assembly.

[0030] The aforementioned aspects and features of the present invention, as well as the aspects and features of the present invention resulting from the further description, can be realized independently of one another, but also in any combination.

[0031] Further advantages, features, properties and aspects of the present invention will become apparent from the claims and the following description of a preferred embodiment with reference to the drawing. It shows: Fig. 1 a schematic perspective view of a pipetting device according to the invention; Fig. 2 a schematic exploded view of the pipetting device; Fig. 3 a schematic sectional view of a base body of the pipetting device; Fig. 4 a schematic, partially cutaway side view of the pipetting device in a first position during assembly; Fig. 5 a schematic, partially cutaway side view of the pipetting device in a second position during assembly; Fig. 6 a schematic, partially cutaway side view of the pipetting device in a third position during assembly; Fig. 7 a schematic, partially cutaway side view of the pipetting device in the assembled state; Fig. 8 a schematic sectional view of the pipetting device with the assembly in the assembled state; Fig.Fig. 9 a schematic perspective view of the pipetting device with the assembly fully assembled; Fig. 10 a schematic section through an operating knob of the pipetting device; and Fig. 11 a schematic perspective view of part of the assembly.

[0032] In the figures, the same reference symbols are used for identical or similar parts, achieving corresponding properties and advantages, even if a repeated description is omitted for the sake of simplicity.

[0033] Fig. 1 Figure 1 shows a pipetting device 1 for aspirating and dispensing fluid volumes in a perspective view. Fig. 2 Pipetting device 1 is shown in an exploded view.

[0034] The pipetting device 1 has a housing 2. The pipetting device 1 can be held and guided by hand by a user using the housing 2.

[0035] The in Fig. 1 The illustrated pipetting device 1 or housing 2 preferably has an elongated shape and a longitudinal axis L. The longitudinal axis L preferably runs centrally through the pipetting device 1 or housing 2.

[0036] When terms such as "axial," "axial direction," and the like are used below, they refer to the longitudinal axis L. Similarly, terms such as "radial," "radial direction," and the like also refer to the longitudinal axis L and denote a direction perpendicular to the longitudinal axis L. When terms such as "above," "below," and the like are used below, they preferably refer to the extent of the longitudinal axis L and, in particular, to the direction in Fig. 1The depicted position of the pipetting device 1 (in its fully assembled state) corresponds in particular to a user's position when using or holding the pipetting device 1. Furthermore, a "horizontal" direction or extension, etc., preferably refers to a direction or extension, etc., perpendicular to the longitudinal axis L (in the assembled state of the pipetting device 1). Similarly, a "vertical" direction or extension, etc., refers to a direction or extension, etc., parallel to the longitudinal axis L.

[0037] The housing 2 preferably has a base body 3. The longitudinal axis L is preferably a longitudinal axis and / or axis of symmetry of the base body 3. The base body 3 is therefore preferably symmetrical, in particular mirror-symmetrical, with respect to a plane of symmetry having the longitudinal axis L.

[0038] The basic body 3 is particularly in Fig. 3shown in more detail, with the base body 3 being cut along the longitudinal axis L or plane of symmetry of the base body 3 and shown "unfolded". In particular, the Fig. 3 thus the inner workings of the basic body 3.

[0039] Preferably, the housing 2 consists of several parts. In particular, the housing 2 has a connecting part 4 in addition to the base body 3.

[0040] The connecting part 4 is preferably attachable to the base body 3. In particular, the base body 3 can be at least partially closed by means of the connecting part 4, or the base body 3 with the attached connecting part 4 forms a housing 2 that is closed at least radially with respect to the longitudinal axis L.

[0041] The housing 2 or the base body 3 preferably encloses a cavity 5. The cavity 5 preferably extends at least substantially along the longitudinal axis L. At least radially to the longitudinal axis L, the cavity 5 is preferably bounded by the housing 2 or the base body 3 and / or the connecting part 4. Preferably, the cavity 5 is open upwards and / or downwards, i.e., on a top and / or bottom surface of the housing 2 or base body 3 with respect to the position shown in the figures.

[0042] The housing 2 or the base body 3 has an inner surface 6 and an outer surface 7. In particular, the inner surface 6 delimits the cavity 5, at least radially.

[0043] Preferably, the connecting part 4 together with the base body 3 forms a closed inner surface 6 and / or an outer surface 7 of the housing 2. The connecting part 4 preferably terminates flush with the base body 3 on the outer surface 7.

[0044] The housing 2 or the base body 3 preferably has an opening 8. The opening 8 is preferably located at least partially at an upper end of the base body 3. In particular, the opening 8 is not located exclusively at an upper end of the base body 3, but also laterally. The base body 3 is therefore preferably also partially open laterally or radially. In particular, the base body 3 has a cutout radially to the longitudinal axis L, or the opening 8 extends downwards from the top of the base body 3.

[0045] The connecting part 4 is preferably connectable to the base body 3, in particular by snap-fit ​​or positive locking connection.

[0046] Preferably, the base body 3 and / or the connecting part 4 has one or more locking elements 9, in particular locking lugs or locking hooks. In particular, the base body 3 and the connecting part 4 each have at least one locking element 9, wherein the locking elements 9 of the base body 3 and the connecting part 4 correspond to each other or, in the assembled state of the pipetting device 1 or the housing 2, engage with each other, so that the connecting part 4 is positively connected to the base body 3.

[0047] Preferably, the base body 3 and / or the connecting part 4 have one or more projections 10 for connecting the connecting part 4 to the base body 3. In particular, the base body 3 and the connecting part 4 each have at least one, and preferably several, symmetrically arranged, corresponding projections 10. The projections 10 preferably form a tongue-and-groove connection when the connecting part 4 is connected to or attached to the base body 3. The projection 10 or projections 10 of the base body 3 is / are preferably arranged at an upper end or edge of the base body 3 facing the connecting part 4. The projection 10 or projections 10 of the connecting part 4 is / are preferably arranged at a lower end or edge of the connecting part 4 facing the base body 3.The projections 10 preferably extend at least substantially in one direction parallel to the longitudinal axis L. The projection 10 of the connecting part 4 preferably rests against the inner surface 7 of the base body 3 when the connecting part 4 is connected to the base body 3.

[0048] The pipetting device 1 preferably comprises a displacement device (not shown in the figures). The displacement device preferably comprises a displacement element, in particular a piston, and a displacement housing, in particular a cylinder. The displacement device is therefore preferably designed as a piston-cylinder arrangement.

[0049] The displacement device is designed to draw a fluid, in particular a liquid, into the pipetting device 1, especially into a (not shown) pipette tip of the pipetting device 1, and then to discharge it again from there. The displacement device can be completely or partially separable from the pipetting device 1 or the housing 2.

[0050] The longitudinal axis L preferably runs centrally through the displacement device, in particular through the displacement means and the displacement housing.

[0051] Preferably, the pipetting device 1 has a drive unit 11. The drive unit 11 is designed to move the displacement element within the displacement housing. Preferably, the movement of the displacement element is limited. This, in particular, defines or limits the stroke of the displacement element.

[0052] The pipetting device 1 preferably has a volume display 12 for indicating a pipetting volume. The pipetting volume is preferably associated with or correlated to the stroke of the displacement device.

[0053] Furthermore, the pipetting device 1 preferably has an adjustment device 13. The adjustment device 13 is designed in particular for changing the stroke, especially preferably for changing the position of the upper stop. In other words, the stroke of the displacement element and thus, in particular, the pipetting volume can be adjusted or changed by means of the adjustment device 13.

[0054] The pipetting device 1 preferably has an adjustment indicator 14. The adjustment indicator 14 is designed in particular to display an adjustment value of the stroke of the displacement means.

[0055] The adjustment indicator 14 is designed to display and / or specify or set an adjustment value for the stroke of the displacement device. Such an adjustment value is achieved by adjusting the stroke and the pipetting volume so that the volume indicator 12 can reference the actual, or at least substantially the actual, dispensed pipetting volume. The adjustment value determines the extent to which any deviations are to be taken into account.

[0056] The adjustment indicator 14 preferably has at least one number wheel rotatable about the longitudinal axis L and displaying a scale for an adjustment value of the stroke of the displacement means.

[0057] The adjustment indicator 14 preferably has a device, in particular an elastic element, for fixing the position. The elastic element is in particular designed as a one-piece detent spring 14A. The device for fixing the position of the adjustment indicator 14 or the detent spring 14A is in Fig. 11 depicted.

[0058] The pipetting device 1 has an assembly 15. The assembly 15 comprises several components of the pipetting device 1 or is formed from several components of the pipetting device 1.

[0059] An assembly assembly within the meaning of the present invention is in particular an assembly consisting of several components of the pipetting device 1, which are pre-assembled or (firmly) connected to one another in such a way that they together form a unit and in particular can be inserted together or as a unit into the housing 2 or the base body 3 of the pipetting device 1 and / or mounted therein.

[0060] The assembly 15 preferably has a longitudinal axis A. In particular, the assembly 15 extends substantially along the longitudinal axis A and / or the longitudinal axis A runs at least substantially centrally through the assembly 15. In the fully assembled state of the assembly 15, the longitudinal axis A of the assembly 15 is preferably parallel, and in particular identical, to the longitudinal axis L of the pipetting device 1 or the housing 2.

[0061] To assemble the pipetting device 1 or the assembly 15, the assembly 15 is inserted into the base body 3 and preferably fixed or fastened in the base body 3. Subsequently, the connecting part 4 is preferably arranged on or attached to the base body 3. This will be explained in more detail later, particularly with reference to the Figures 4 to 7 , which show different steps or positions of the assembly group 15 during assembly.

[0062] In particular, the assembly 15 can be inserted into the cavity 5 through the opening 8 of the base body 3 for assembly.

[0063] In the assembled state, the assembly group 15 is at least partially arranged in the cavity 5 and detachably attached to the base body 3.

[0064] The pipetting device 1 has a first guide device 16 and a second guide device 17. The first and second guide devices 16, 17 correspond to each other. In particular, the guide devices 16, 17 are designed to guide the assembly 15 during assembly or insertion into the base body 3, or to define or specify an insertion path or a positive guidance for the assembly 15.

[0065] In the Figures 4 to 7The assembly 15 is shown in a side view and the base body 3 in a sectional view, with the section plane lying on a side of the base body 3 facing the viewer and being chosen such that it passes through the first guide device 16, specifically its guide rail 20 and stop element 21. From the viewer's perspective, the assembly 15 is therefore located behind the guide rail 20 and the stop element 21.

[0066] The first guide device 16 is preferably arranged or formed on the inner side 6 of the base body 3. In particular, the guide device 16 is formed by projections on the inner side 6 of the base body 3.

[0067] The second guide device 17 is preferably arranged or formed on the assembly assembly 15, in particular on the outside of the assembly assembly 15.

[0068] The first and second guide devices 16, 17 are preferably designed to correspond to each other and / or to slide along each other or to contact and / or guide each other during the assembly of the pipetting device 1 or assembly assembly 15 and / or to engage with each other after completion of the assembly.

[0069] In particular, the first and second guide devices 16, 17 each define one or more unique positions of the assembly 15 relative to the base body 3 during and / or after assembly. Specifically, it is uniquely defined which position the assembly 15 assumes or can assume at the beginning of assembly and which positions the assembly 15 assumes or can assume successively during assembly. This defines, in particular, an insertion path or a forced guidance for the assembly 15 during assembly, so that only the positions defined by the guide devices 16, 17 are possible during assembly and / or the positions of the assembly 15 are uniquely defined.In this way, incorrect alignment of components during the assembly of the pipetting device 1 can be prevented and / or the assembly assembly 15 can be automatically inserted correctly into the base body 3 and fully assembled therein.

[0070] The first and second guide devices 16, 17 thus define in particular an insertion path for inserting the assembly 15 into the base body 3, such that the assembly 15 can only be inserted into the base body 3 along the insertion path defined by the guide devices 16, 17 and / or insertion on a path other than the defined insertion path is blocked or prevented.

[0071] The first guide device 16 forms, in particular, a channel 18. Specifically, the first guide device 16 has several sections that are spaced apart from one another, such that the space between these sections forms a channel 18. Preferably, at least a part of the second guide device 17 can be inserted into the channel 18 formed by the first guide device 16.

[0072] Preferably, the second guide device 17 forms a channel 19. In particular, the second guide device 17 has several sections that are spaced apart from one another, such that the distance between these sections forms a channel 19. Preferably, at least a part of the first guide device 16 can be inserted into the channel 19 formed by the second guide device 17.

[0073] The first guide device 16 preferably has several separate or mutually separate sections or parts.

[0074] In particular, the first guide device 16 has a guide rail 20. The guide rail 20 is specifically designed to guide the assembly group 15 or the second guide device 17 during assembly.

[0075] Furthermore, the first guide device 16 preferably has a stop element 21. The stop element 21 is preferably spaced apart from the guide rail 20, in particular in the circumferential direction along the inside 6 of the base body 3.

[0076] The guide rail 20 and the stop element 21 represent in particular the aforementioned sections of the first guide device 16.

[0077] The guide rail 20 is particularly elongated and / or runs at least substantially parallel to the longitudinal axis L. The guide rail 20 preferably projects from the inner side 6 of the base body 3 or forms a protrusion of the inner side 6.

[0078] The stop element 21 preferably projects from the inner side 6 of the base body 3 or forms a protrusion on the inner side 6. Preferably, the stop element 21 projects further from the inner side 6 than the guide rail 20.

[0079] Preferably, the stop element 21 is designed at an angle. In particular, the stop element 21 has several sections, especially a first section 22 and a second section 23. The first and second sections 22, 23 are preferably formed in one piece or connected to each other.

[0080] The first section 22 preferably extends at least substantially perpendicular to the second section 23 and / or the longitudinal axis L and / or the guide rail 20. In particular, the first section 22 forms a shoulder.

[0081] In particular, the second section 23 is elongated. The second section 23 preferably extends at least substantially parallel to the longitudinal axis L and / or the guide rail 20. The channel 18 is formed in particular between the stop element 21 or its second section 23 and the guide rail 20.

[0082] The stop element 21 or its sections 22, 23 preferably form one or more stops 24, 25 for the second guide device 17. In particular, the first section 22 has or forms a first stop 24 for the second guide device 17 and / or the second section 23 has or forms a second stop 25 for the second guide device 17.

[0083] The first stop 24 preferably extends at least substantially horizontally or perpendicular to the longitudinal axis L / A. The second stop 25 preferably extends at least substantially vertically or parallel to the longitudinal axis L / A.

[0084] The stop element 21 preferably forms a center of rotation or a preferably horizontal axis of rotation for the assembly 15. This is particularly evident from the Figures 6 and 7 This is evident and will be explained in more detail later. In other words, the assembly 15 is preferably rotatable during assembly, with the axis of rotation about which the assembly 15 is rotated passing through the stop element 21. In this sense, the axis of rotation is in particular a virtual or imaginary axis, but not a physical axis in the sense of a component.

[0085] In particular, the rotation of the assembly 15 about the axis of rotation is carried out from the in Fig. 6 position shown in the Fig. 7 Position shown. This will be explained in more detail later.

[0086] The first guide device 16 is preferably symmetrical and / or mirror-image, particularly with respect to the longitudinal axis L or a mirror plane or plane of symmetry containing the longitudinal axis L. The first guide device 16 particularly preferably has two guide rails 20 and / or two stop elements 21 and, accordingly, particularly also two channels 18. Preferably, the guide rails 20, stop elements 21, and / or channels 18 are each symmetrical or mirror-image with respect to each other, particularly with respect to the longitudinal axis L or a mirror plane or plane of symmetry containing the longitudinal axis L. The mirror plane or plane of symmetry is, in particular, the intersection plane of the Fig. 3The guide rails 20 and / or stop elements 21 are preferably of identical design.

[0087] The second guide device 17 preferably has a first guide contour 26, a second guide contour 27 and / or a third guide contour 28.

[0088] The guide contours 26, 27, 28 represent in particular the aforementioned sections of the second guide device 17.

[0089] The guide contours 26, 27, 28 are designed in particular for guiding the first guide device 16, especially the guide rail 20, during the assembly of the assembly unit 15 or the insertion of the assembly unit 15 into the base body 3.

[0090] The guide contours 26, 27, 28 are preferably each formed as projections on an outer surface of the assembly assembly 15, which is at least substantially smooth and / or cylindrical, or of a component of the assembly assembly 15.

[0091] Preferably, the first guide contour 26 and / or the second guide contour 27 project further outwards or are located at a greater distance from the longitudinal axis L / A than the third guide contour 28. In other words, the guide contour 28 is preferably offset inwards relative to the first guide contour 26 and / or the second guide contour 27. The outwardly facing surfaces of the first guide contour 26 and the second guide contour 27 preferably lie in a common plane, which in particular runs parallel to the longitudinal axis L / A.

[0092] The first guide contour 26 is preferably spaced apart from the second guide contour 27, in particular so that the guide rail 20 can be arranged or implemented between the first guide contour 26 and the second guide contour 27, or so that the channel 25 or at least a part thereof is formed between the first guide contour 26 and the second guide contour 27.

[0093] The first guide contour 26 preferably has one or more guide points, in particular a first guide point 30 and a second guide point 31. The guide points 30, 31 are preferably designed to contact or guide the guide rail 20 when inserting the assembly 15 into the base body 3.

[0094] A guide point according to the present invention preferably has at least one point designed to contact or guide the guide rail 20. However, a guide point can also be linear or planar.

[0095] The first guide point 30 is preferably arranged at a lower end or on a lower side of the first guide contour 26. The second guide point 31 is preferably arranged at an upper end or on an upper side of the guide contour. In particular, the first guide point 30 and the second guide point 31 are arranged on opposite ends or sides of the first guide contour 26 that face away from each other or are axially opposite.

[0096] The first guide point 30 is preferably designed as a point or line. The second guide point 31 is preferably designed as a planar surface or forms a guide surface.

[0097] The first guide point 30 and the second guide point 31 are preferably arranged offset from each other (vertically and horizontally), in particular such that an (imaginary) connecting line between the first guide point 30 and the second guide point 31 runs obliquely to the longitudinal axis L / A.

[0098] The second guide point 31 forms in particular an area for the contact of the guide rail 20 during assembly and / or in the assembled state of the assembly unit 15.

[0099] The first guide contour 26 is preferably designed to interact with the stop element 21 or to be positively connected to the stop element 21. In particular, when the assembly unit 15 is assembled, the stop element 21 forms a positive connection with the first guide contour 26. This is especially evident from Fig. 7 visible.

[0100] Preferably, the first guide contour 26 has one or more mating surfaces corresponding to the stop element 21. In particular, the first guide contour 21 has a first mating surface 32, a second mating surface 33 and / or a third mating surface 34.

[0101] Preferably, the first counter surface 32 and / or the second counter surface 33 extend at least substantially horizontally or perpendicularly to the longitudinal axis L / A. The first counter surface 32 preferably faces downwards. The second counter surface 33 preferably faces upwards. In particular, the stop element 21 can be arranged between the first counter surface 32 and the second counter surface 33.

[0102] The distance between the first counter surface 32 and the second counter surface 33 preferably corresponds approximately to the extent of the stop element 21 parallel to the longitudinal axis L / A, so that the stop element 21 can be clamped or frictionally fixed between the counter surfaces 32, 33.

[0103] The third counter surface 34 preferably extends at least substantially vertically or parallel to the longitudinal axis L / A and / or perpendicular to the first and / or second counter surface 32, 33. The third counter surface 34 is preferably arranged (in the axial direction) between the first counter surface 32 and the second counter surface 33.

[0104] Preferably the first and / or second counter surface 32, 33 adjoin the third counter surface 34 or the first and / or second counter surface 32, 33 are connected to the third counter surface 34.

[0105] In particular, the guide contour 26 is formed in one piece.

[0106] To form the positive locking between the stop element 21 and the first guide contour 26, the assembly assembly 15 or first guide contour 26 is preferably placed on the first stop 24, in particular by means of the first counter surface 32, and / or pivotable against the second stop 25, in particular by means of the third counter surface 34.

[0107] This is particularly evident from the Figures 6 and 7 visible: Fig. 6Figure 1 shows a position of the assembly 15 in which the first guide contour 15 rests on the first stop 24 with the second counter surface 22. During assembly of the assembly 15, the assembly 15 or guide contour 26 is preferably subsequently pivoted or rotated. In particular, the stop element 21 forms a center of rotation, or the axis of rotation about which the assembly 15 is pivoted or rotated passes through the stop element 21. At the end of the pivoting or rotating movement, the assembly 15 or first guide contour 26 is preferably located in the position shown in Figure 21. Fig. 7 position shown. In the Fig. 7 In the position shown, the positive locking between the first guide contour 26 and the stop element 21 is formed. In particular, the assembly 15 is thereby fixed in the base body 3.

[0108] The assembly assembly 15 is preferably secured against rotation about the longitudinal axis A / L and / or against axial movement by the positive locking between the stop element 21 and the first guide contour 26.

[0109] The second guide contour 27 preferably extends transversely, and in particular perpendicularly, to the longitudinal axis L / A. In particular, the second guide contour 27 laterally limits the channel 19 or the insertion path for the guide rail 20. The second guide contour 27 is preferably designed for the lateral guidance of the guide rail 20.

[0110] The third guide contour 28 preferably extends at least substantially axially or parallel to the longitudinal axis L. In particular, the third guide contour 28 is designed to guide the guide rail 20 along an inner surface of the guide rail 20. Specifically, the guide rail 20 and the third guide contour 28 are designed such that, when the assembly 15 is inserted into the base body 3, an inner surface of the guide rail 20 contacts or slides along an outer surface of the third guide contour 28.

[0111] At its upper end, the third guide contour 28 preferably has a transverse section 29 that extends at least substantially horizontally or perpendicularly to the longitudinal axis L / A. The transverse section 29 is preferably designed so that the guide rail 20, in particular its inner side, bears against the transverse section 29 during assembly and / or in the assembled state of the assembly unit 15.

[0112] Furthermore, the second guide contour 27 is preferably designed for a positive-locking connection with the guide rail 20. In particular, when the assembly unit 15 or the pipetting device 1 is assembled, the second guide contour 27 forms a positive-locking connection with the guide rail 20 or a lower end 20A of the guide rail 20. Specifically, the positive-locking connection of the second guide contour 27 with the guide rail 20 or its lower end 20A secures the assembly unit 15 against axial movement, especially upwards.

[0113] The second guide contour 27, in the assembled state of the assembly unit 15, preferably rests against the guide rail 20 or its lower end 20A.

[0114] The third guide contour 28 preferably secures the assembly 15 in the assembled state against tilting and / or twisting relative to the longitudinal axis L.

[0115] The second and third guide contours 27, 28 are preferably connected to each other or formed in one piece. The second guide contour 27 preferably extends at least substantially horizontally or perpendicularly to the longitudinal axis L.

[0116] The second and third guide contours 27, 28 are preferably angled to each other, in particular arranged at least substantially at right angles to each other.

[0117] Preferably, the second guide contour 27 is designed such that the guide rail 20 slides along the guide rail 20 during assembly or insertion of the assembly assembly 15 into the base body 3, and in the assembled state a positive fit is formed between the second guide contour 27 and the guide rail 20, so that the positive fit prevents or blocks upward movement of the assembly assembly 15 parallel to the longitudinal axis L.

[0118] The third guide contour 28 is preferably elongated. In particular, the third guide contour 28 extends at least substantially parallel to the first guide surface 30 and / or vertically or parallel to the longitudinal axis L.

[0119] The channel 19 of the second guide device 17 is preferably formed between the first guide contour 26 on the one hand and the second guide contour 27 on the other. The guide rail 20 is preferably arranged in or insertable into the channel 19. Preferably, the first guide contour 26, the second guide contour 27, the channel 19, and / or the guide rail 20 are designed or arranged such that the guide rail 20 can only be inserted into the channel 19 if the assembly 15 is tilted at an angle W1 to the longitudinal axis L. The angle W1 is formed, in particular, between the longitudinal axis of the assembly 15 and the longitudinal axis L of the base body 3, as shown, in particular, in Fig. 4depicted.

[0120] The minimum and / or maximum size of the angle W1 is preferably limited or defined by the distance or relative arrangement of the first guide contour 26 or the first guide point 30 and the second guide contour 27. The angle W1 is preferably between 5° and 30°.

[0121] The first guide contour 26 can be arranged in or inserted into the channel 18 of the first guide device 16. Preferably, the guide rail 20, the stop element 21, the channel 18, and / or the first guide contour 26 are designed or arranged such that the first guide contour 26 can only be inserted into the channel 18 if the assembly 15 is tilted at an angle W2 to the longitudinal axis L. The angle W2 is formed, in particular, between the longitudinal axis A of the assembly 15 and the longitudinal axis L of the base body 3, as shown, in particular, in Fig. 5 and6 depicted.

[0122] Angle W2 is preferably smaller than angle W1. Angle W1 is preferably between 2° and 20°.

[0123] The size of the angle W2 is preferably limited or defined by the distance or relative arrangement of the first guide contour 26 or the second guide point 31 and the second guide contour 27.

[0124] In particular, the guide rail 20 can be inserted between the first guide contour 26 and the second guide contour 27. Preferably, the guide rail 20 and the third guide contour 28 are designed and dimensioned such that an inner surface of the guide rail 20 contacts the third guide contour 28 or slides along it when the guide rail 20 is inserted between the first guide contour 26 and the second guide contour 27. Thus, the third guide contour 28 is preferably designed to guide the guide rail 20 from the inside. The first guide contour 26 and the second guide contour 27 are preferably designed to guide the guide rail 20 laterally, in particular from different or opposite sides.

[0125] The pipetting device 1 preferably has a fastening means 35 for fastening or fixing the assembly 15 in the housing 2. In particular, the assembly 15 is connected to the housing 2, especially the connecting part 4, by the fastening means 35 when assembled.

[0126] The fastening element 35 is particularly suitable for use in the Fig. 8 and 9 shown. Fig. 8 shows a section through the pipetting device 1 with the fully assembled mounting assembly 15 along the longitudinal axis L / A. Fig. 9 shows a perspective view of the pipetting device 1.

[0127] The fastening element 35 is preferably designed to block relative movement between the assembly group 15 and the connecting part 4 and / or the base body 3 in the radial direction and / or in the axial direction and / or in the circumferential direction.

[0128] The fastening element 35 is in particular a screw, a pin, a rivet or the like.

[0129] In particular, the fastening element 35 serves, in addition to its fastening function, to compensate for tolerances between the connecting part 4 and the base body 3.

[0130] In the assembled state, rotation of the mounting assembly 15 about its center of rotation or axis of rotation is preferably prevented – alternatively or additionally to the fastening means 35 – by fitting a volume adjustment sleeve 36 of the pipetting device 1 over the mounting assembly 15. The volume adjustment sleeve 36 serves in particular to adjust the pipetting volume of the pipetting device 1.

[0131] The pipetting device 1 preferably has an aperture 37. In particular, the aperture 37 conceals the fastening element 35 in the fully assembled state of the pipetting device 1, so that it is not visible to a user.

[0132] In particular, the aperture 37 can be arranged or fixed in a recess of the housing 2, especially of the connecting part 4, which is associated with the aperture 37.

[0133] The aperture 37 preferably has a viewing window 37A through which the volume indicator 12 can be read.

[0134] A method for assembling the pipetting device 1 is explained in more detail below. In particular, the method for assembling the pipetting device 1 constitutes a separately implementable aspect of the present invention.

[0135] Some of the steps described below may also be omitted.

[0136] Preferably, for the assembly of the pipetting device 1, the pipetting device 1 or its components are first provided, in particular the assembly assembly 15 and the base body 3.

[0137] For assembly, the assembly unit 15 is inserted through the opening 8 of the base body 3 into the cavity 5. In particular, the assembly unit 15, or rather its longitudinal axis A, is tilted relative to the longitudinal axis L of the base body 3, as shown in particular in Fig. 4 is shown.

[0138] In particular, the second guide device 17 is brought into engagement with the first guide device 16, especially the guide rail 20. The guide rail 20 is preferably passed between the first guide contour 26 and the second guide contour 27 or inserted into the channel 19.

[0139] When the second guide device 17 engages with the first guide device 16, the guide rail 20 preferably rests, in particular laterally, against the first guide contour 26 and, in particular laterally, against the second guide contour 27 and, in particular, internally, against the third guide contour 28.

[0140] Fig. 4 shows a position of the assembly 15 in which the upper end of the guide rail 20 has already been guided past the first guide contour 26 or its first guide point 30 and the guide rail 20 contacts the second guide contour 27.

[0141] The assembly 15 is then preferably inserted further into the base body 3. In particular, the assembly 15 is moved along the first guide device 16. Here, the guide rail 20 preferably rests against the second guide contour 27 and the first guide contour 26, especially the second guide point 31.

[0142] This is especially true in Fig. 5 depicted.

[0143] Before or during the further insertion of the assembly 15 into the base body 3, the angle W1 by which the assembly 15 is tilted is preferably changed, in particular reduced. In particular, the assembly 15 or its longitudinal axis A is (necessarily) tilted by the angle W1 specified in the diagram. Fig. 5 The angle W2 shown is tilted against the base body 3 or its longitudinal axis L when the guide rail 20 rests against the second guide contour 27 and the second guide point 31.

[0144] Preferably, the assembly 15 is moved along the first guide device 16 or the guide rail 20 until the second guide device 17, in particular the first guide contour 26 or its second counter surface 33, rests on the stop element 21, in particular its second stop 25.

[0145] In the Fig. 6 The position shown is where the assembly group 15 rests on the second stop 25.

[0146] During the movement of the assembly 15 along the first guide device 16 or before it rests on the stop 25, the assembly 15 is preferably secured against rotation, in particular about the longitudinal axis A / L. This securing against rotation is achieved in particular by the guide rail 20 bearing against the first guide contour 26, second guide contour 27 and / or third guide contour 28, thus preventing rotation of the assembly 15.

[0147] The assembly 15 is then preferably pivoted or rotated into a final position. The final position is particularly defined as follows: Fig. 7 depicted.

[0148] The pivoting or rotational movement for moving the assembly 15 into its final position occurs particularly about the preferably horizontal axis of rotation. The axis of rotation is preferably an imaginary or virtual axis and runs particularly through the stop element 21. Thus, the stop element 21 preferably forms a center of rotation for the assembly 15.

[0149] When rotating the assembly 15, the second guide device 17, in particular the first guide contour 26, is preferably rotated or pivoted against the stop element 21 or its second stop 25.

[0150] At the end of the rotation of the assembly 15, the second guide device 17 preferably engages with the first guide device 16. In particular, the first guide contour 26 engages with the stop element 21 and / or the second guide contour 27 engages with the guide rail 20.

[0151] Optionally, the connecting part 4 is then connected to the base body 3. This is done, in particular, by engaging the locking elements 9 of the base body 3 and the connecting part 4, especially by placing the connecting part 4 at an angle onto the base body 3. Preferably, the connecting part 4 is then pivoted towards the base body 3. In particular, the projections 10 of the connecting part 4 are brought into contact with the inner surface 6 of the base body.

[0152] Optionally, the assembly group 15 is connected to the housing 2, in particular to the connecting part 4, by means of the fastening element 35.

[0153] Preferably, the fastening means 35 firmly connects the connecting part 4 to the base body 3 and additionally fixes the assembly 15 in the base body 3.

[0154] Finally, the (optional) aperture 37 is preferably connected to the housing 2 or connecting part 4, in particular by inserting the aperture 37 into the corresponding recess of the housing 2 or connecting part 4. Preferably, the inserted aperture 37 presses the connecting part 4 into the base body 3, thus minimizing the gap between the connecting part 4 and the base body 3.

[0155] In the subsequent assembly steps, the finger bracket assembly is placed on the housing 2 and the drive unit 11 or lifting rod is inserted.

[0156] However, it is also possible that the finger bracket assembly or a part thereof, in particular a lower part of the finger bracket assembly, and / or the connecting part 4 form a part of the assembly assembly 15 and / or are attached to the assembly assembly 15 before the assembly assembly 15 is mounted or inserted into the base body 3.

[0157] The operating knob 38, which is preferably constructed in two parts and consists of an operating knob base body 39 and an operating knob insert 40, is then assembled.

[0158] The control knob body 39 is tubular in design and forms a cavity which is divided into an upper and a lower section by a stop 41. The stop 41 is designed as a radial projection with a central opening. The lower section of the control knob body 39 can encompass the drive unit 11 or the lifting rod. In this configuration, the stop 41 of the control knob body 39 engages with a stop 42 of the drive unit 11 or the lifting rod. The stop 42 of the lifting rod is positioned in front of the upper end of the lifting rod, so that the upper end of the lifting rod is inserted through the opening of the stop 41 or the control knob body 39.

[0159] The control knob insert 40 is mushroom-shaped. An actuating surface 43 is located at the upper end of the control knob insert 40, and a radial groove 44 is located at the lower end. A clamping ring 45 and / or an O-ring 45 can be fitted into the radial groove 44, which elastically press the lower end of the control knob insert 40 inwards. A radially outwardly projecting bulge 46 is located below the actuating surface 43 of the control knob insert 40.

[0160] When the operating button insert 40 is inserted into the operating button base body 39, a positive fit is created between the upper end region of the drive unit 11 or lifting rod and the lower end of the operating button insert 40. The bulge 46 on the upper side of the operating button insert 40 forms a frictional fit with the operating button base body 39. This enables the operating button insert 40 to be fixed in the operating button base body 39 and also secures this two-part operating button 38 and the drive unit 11 or lifting rod.

[0161] Individual aspects of the invention described above can be implemented independently of one another, but also in any combination, and can be advantageous. Reference symbol list:

[0162] 1 Pipetting device 2 Housing 3 Base body 4 Connecting part 5 Cavity 6 Inside 7 Outside 8 Opening 9 Detent element 10 Projection 11 Drive unit 12 Volume indicator 13 Adjustment device 14 Adjustment indicator 14A Detent spring 15 Mounting assembly 16 First guide device 17 Second guide device 18 Channel of 16 19 Channel of 17 20 Guide rail 20A Lower end of 20 21 Stop element 22 First section of 21 23 Second section of 21 24 First stop of 21 / 22 25 Second stop of 21 / 23 26 First guide contour of 17 27 Second guide contour of 17 28 Third guide contour of 17 29 Cross section of 28 30 First guide point of 26 31 Second guide point of 26 32 First mating surface of 26 33 Second mating surface of 26 34 Third mating surface of 26 35 Fastening element 36 Volume adjustment sleeve 37 Cover 37 A Viewing window 38 Control knob 39 Control knob body 40 Control knob insert 41 Stop 42 Stop 43 Actuating surface 44 Notch 45 Clamping ring / O-ring 46 Curvature Longitudinal axis of 15 Longitudinal axis of 1 / 3 W1 first angle W2 second angle

Claims

1. A pipetting device (1) for receiving and dispensing fluid volumes, comprising - a housing (2) with a base body (3) which encloses a cavity (5) and has an inner side (6) delimiting the cavity (5), an outer side (7) and an opening (8), and - a mounting assembly (15) which comprises several components of the pipetting device (1), wherein the mounting assembly (15) can be inserted into the cavity (5) of the base body (3) through the opening (8) of the base body (3) for assembly and, in the assembled state, is arranged in the cavity (5) of the base body (3) and is detachably fastened to the base body (3), wherein a first guide device (16) is formed on the inner side (6) of the base body (3),wherein a second guide device (17) is formed on the mounting assembly (15), and wherein at least temporarily during the assembly of the mounting assembly (15) and in the assembled state of the mounting assembly (15), the first guide device (16) is in engagement with the second guide device (17).

2. Pipetting device according to claim 1, wherein the pipetting device (1) comprises: - a displacement device, in particular a piston-cylinder arrangement, with - a displacement means, in particular a piston, and - a displacement housing, in particular a cylinder, - a drive device (11) for moving the displacement means in the displacement housing, - wherein a movement of the displacement means is limited by an upper stop, a lower stop and at least one counter-stop of the drive device and / or the displacement means, so that a stroke of the displacement means is defined, - a volume display (12) for displaying a value assigned to or corresponding to the stroke of the displacement means.with the pipetting volume correlating with the stroke of the displacement means, - an adjusting device (13) which is designed to change the stroke of the displacement means, in particular to change the position of the upper stop, and - an adjustment display (14) for displaying an adjustment value of the stroke of the displacement means (12), wherein the mounting assembly (15) comprises at least one component of the volume display (12) and / or at least one component of the adjusting device (13) and / or at least one component of the adjustment display (14).

3. Pipetting device according to claim 1 or 2, wherein the first and second guide means (16, 17) define an insertion path for inserting the mounting assembly (15) into the base body (3), so that the insertion of the mounting assembly (15) along a path other than the defined insertion path is blocked or prevented and / or the mounting assembly (15) can be inserted into the base body (3) exclusively along the defined insertion path.

4. Pipetting device according to one of the preceding claims, wherein the first guide device (16) has a, preferably elongated, guide rail (20) for guiding the mounting assembly (15) during mounting of the mounting assembly (15).

5. Pipetting device according to claim 4, wherein the guide rail (20) forms an elevation on the inner side (6) of the base body (3).

6. Pipetting device according to claim 4 or 5, wherein the first guide device (16) has two preferably identical guide rails (20) for guiding the mounting assembly (15) during assembly of the mounting assembly (15), wherein the guide rails (20) are arranged opposite one another.

7. Pipetting device according to one of the preceding claims, wherein the first guide device (16) has a stop element (21), preferably of angled design.

8. Pipetting device according to claim 7, wherein the stop element (21) forms a center of rotation for the mounting assembly (15) or wherein the stop element (21) forms a preferably horizontal axis of rotation for the mounting assembly (15).

9. Pipetting device according to claim 7 or 8, wherein the first guide device (16) has two preferably identical stop elements (21), wherein the stop elements (21) are arranged opposite one another.

10. Pipetting device according to one of the preceding claims, wherein the first guide device (16) forms a channel (18) into which at least a part of the second guide device (17), in particular a first guide contour (26), can be inserted, preferably wherein the channel (18) is formed between the guide rail (20) and the stop element (21).

11. Pipetting device according to one of the preceding claims, wherein the second guide device (17) forms a channel (19) into which at least a part of the first guide device (16), in particular a guide rail (20), can be inserted, preferably wherein the channel (19) is formed between a first guide contour (26) and a second guide contour (27).

12. Pipetting device according to one of the preceding claims, wherein the second guide device (17) has at least one first guide contour (26), at least one second guide contour (27) and at least one third guide contour (28) for guiding the mounting assembly (15) along the guide rail (20) of the first guide device (16).

13. Pipetting device according to claim 12, wherein the first guide contour (26) is spaced apart from the second guide contour (27) for guiding the guide rail (20) between the first guide contour (26) and the second guide contour (27), preferably wherein the second guide contour (27) forms a first region for the guide rail (20) to bear against during assembly and the first guide contour (26) forms a second region for the guide rail (20) to bear against during assembly.

14. Pipetting device according to claim 12 or 13, wherein the second guide contour (27) is connected to the third guide contour (28) or is formed in one piece.

15. Pipetting device according to claim 7 or 8 or 9 and one of claims 12 to 14, wherein the stop element (21) forms a first stop (24) for the second guide device (17), in particular for the first guide contour (26), preferably wherein the first guide contour (26) can be placed on the first stop (24), in particular wherein the first stop (24) limits the insertion path of the mounting assembly (15).

16. Pipetting device according to claim 7 or 8 or 9 and one of claims 12 to 15, wherein the stop element (21) forms a second stop (25) for the second guide device (17), in particular for the first guide contour (26), preferably wherein the first guide contour (26) is pivotable against the second stop (25).

17. Pipetting device according to claim 7 or 8 or 9 and one of claims 12 to 16, wherein in the assembled state of the mounting assembly (15) the stop element (21) forms a positive connection with the second guide device (17), in particular with the first guide contour (26), preferably wherein the positive connection blocks a relative movement between the stop element (21) and the second guide device (17), and thus between the mounting assembly (15) and the base body (3), in the axial direction and / or in the circumferential direction, preferably wherein the first guide contour (26) engages around the stop element (21).

18. Pipetting device according to claim 7 or 8 or 9 and one of claims 12 to 17, wherein in the assembled state of the mounting assembly (15) the first guide contour (26) rests against the first stop (24) and the second stop (25).

19. Pipetting device according to claim 4 or 5 or 6 and one of claims 7 to 18, wherein in the assembled state of the mounting assembly (15) the guide rail (20) forms a positive connection with the second guide device (17), in particular wherein the guide rail (20) bears at least in sections against the first guide contour (26), the second guide contour (27) and the third guide contour (28), whereby, preferably, the mounting assembly (15) is fixed in the base body (3).

20. Pipetting device according to one of the preceding claims, wherein the mounting assembly (15) in the mounted state is connected to the housing (2), in particular to a connecting part (4) of the housing (2), by a fastening means (Z), in particular by a screw, a pin or a rivet, preferably wherein the fastening means (Z) blocks a relative movement between the mounting assembly (15) and the base body (3) in the radial direction and / or in the axial direction and / or in the circumferential direction.

21. A method for assembling a pipetting device (1), comprising the steps of a) providing a pipetting device (1) according to one of claims 1 to 20, b) inserting the mounting assembly (15) through the opening of the base body (3) into the cavity (5) of the base body (3), c) engaging the second guide device (17) with the first guide device (16), d) moving the mounting assembly (15) along the first guide device (16) until the second guide device (17) rests on a stop (24) of the first guide device (16), and e) rotating the mounting assembly (15) about a preferably horizontal axis of rotation into an end position of the mounting assembly (15).

Images