Laboratory centrifuge rotor

Abstract

The invention relates to a laboratory centrifuge rotor (1). The laboratory centrifuge rotor (1) has a rotor arm (4) with an integrally formed swing-out chamber pin (6). A swing-out chamber (8) is pivotably mounted on the swing-out chamber pin (6). According to the invention, a stress relief notch (12) is provided in the transition area between the swing-out chamber pin (6) and the rotor arm (4). This stress relief notch (12) reduces the amount of material required and advantageously influences the stress distribution, thereby increasing the strength.

Description

TECHNICAL AREA OF INVENTION

[0001] The invention relates to a laboratory centrifuge in which vibrating bowls containing products to be centrifuged are held on a laboratory centrifuge rotor. The vibrating bowls are pivotably mounted on arms of the laboratory centrifuge rotor. When the laboratory centrifuge rotor is at rest, the longitudinal axes of the vibrating bowls are aligned parallel to a rotor axis of the laboratory centrifuge rotor due to gravity. Upon commencement of centrifugal operation of the laboratory centrifuge and an increase in the rotational speed of the laboratory centrifuge rotor, the vibrating bowls oscillate such that one longitudinal axis of the vibrating bowl changes its alignment from parallel to the rotor axis, such that the longitudinal axis rotates around the rotor axis on a conical surface. The cone angle of the conical surface increases with increasing rotational speed and reaches 90° in the theoretical limiting case.Laboratory centrifuges with vibrating chambers mounted on the rotor in this manner can generate gravitational fields of, for example, greater than 2,000 xg, 4,000 xg, or 6,000 xg to achieve the desired sedimentation of the products. Application areas for such laboratory centrifuges and rotors include medicine and research. STATE OF THE ART

[0002] Figs. 1 to 4 show a known embodiment of a laboratory centrifuge rotor, which is marketed by the applicant under article number "11806".

[0003] In the explanation of the prior art and the invention, components or features that are similar or equivalent in design and / or function are sometimes identified by the same reference numbers, which may then be distinguished from one another by an additional letter a, b, ... These components or features may be referred to with or without the additional letter, whereby, when referred to without the additional letter, one such component or feature, several such components or features, or all such components or features may be meant. Furthermore, components that are associated with a specific swing-out container and the associated swing-out axis are identified by the suffix "-1", "-2", ..., whereby, here too, use with or without this suffix is ​​possible with a corresponding meaning.

[0004] A laboratory centrifuge rotor 1 has a hub 2 in the area where the laboratory centrifuge rotor 1 can be detachably connected to a drive train of a laboratory centrifuge. Rotor arms 4 extend radially from the hub 2 to a rotor axis 3. In the illustrated embodiment, the laboratory centrifuge rotor 1 has six rotor arms 4a to 4f, although embodiments with a different number of rotor arms 4 are also known.

[0005] In their radially outer end regions, the rotor arms 4 have extensions that form mounting brackets 5. Swing-out chamber pins 6a-1, 6b-1 are integrally formed on the mounting brackets 5a, 5b of adjacent rotor arms 4a, 4b, defining aligned swing-out axes 7-1. A swing-out chamber 8-1 is then rotatably mounted about the swing-out axis 7-1 on each pair of swing-out chamber pins 6a-1, 6b-1 of adjacent rotor arms 4a, 4b.

[0006] Furthermore, reference is made by way of example to the rotor arms 4a, 4b, the holding brackets 5a, 5b, the swing-out container pins 6a-1, 6b-1, the swing-out axis 7-1 and the swing-out container 8-1, whereby the same applies to the other rotor arms 4, holding brackets 5, swing-out container pins 6, swing-out axes 7 and swing-out container 8-1.

[0007] In Fig. 1 The laboratory centrifuge rotor 1 is at rest. In this state, the swing-out containers 8 are suspended from the swing-out container pins 6 such that, due to gravity, the longitudinal axes of the swing-out containers 8 are oriented parallel to the axis of rotation 3, and an opening of the swing-out containers 8 (which may also be closed with a lid in some embodiments) points upwards.

[0008] In Fig. 2The laboratory centrifuge rotor 1 is driven at a rotational speed by a drive train of the laboratory centrifuge. As a result of the centrifugal force acting on the swing-out containers 8, the swing-out containers 8 oscillate around the swing-out axis 7 such that the longitudinal axes of the swing-out containers 8 rotate along a conical surface around the rotor axis 3 and the opening of the swing-out container 8 points with a component in the direction of the rotor axis 3.

[0009] In the cut according to Fig. 3 The shape of the laboratory centrifuge rotor 1, particularly in the area of ​​the rotor arms 4, the mounting brackets 5, and the swing-out chamber pins 6, can be seen perpendicular to the rotor axis 3. Viewed in the direction of the rotor axis 3, the rotor arms 4 diverge in the area of ​​the mounting brackets 5 such that they have an outer contour bounded by V-shaped legs 9, 10. The swing-out chamber pins 6 are then oriented perpendicular to the legs 9, 10.

[0010] Fig. 4 shows a detail of a top view of an end area of ​​a rotor arm 4, the holding bracket 5 and the two swing-out container pins 6.

[0011] Further information on the state of the art regarding laboratory centrifuge rotors can be found, for example, on the internet pages. www.hettichlab.com / de / paket / rotofix-32-a-paket-1 www.hettichlab.com / de / paket / universal-320-r-paket-2 www.hettichlab.com / de / paket / universal-320-konisch-paket-3 www.hettichlab.com / de / paket / universal-320-paket-2 www.hettichlab.com / de / paket / universal-320-paket-1 www.eppendorf.com / de-de / Rotoren-für-die-Zentrifugenfamilie-58xx-p-5820755008 www.eppendorf.com / de-de / Rotoren-für-die-Zentrifugenfamilie-58xx-p-5810743001 www.thermofisher.com / order / catalog / product / 75003657?SID=srch-srp-75003657 www.thermofisher.com / order / catalog / product / 75003181?SID=srch-srp-75003181 revealed.

[0012] The prior art documents CN 212 041 018 U, DE 92 14 633 U1 and EP 3 311 924 A1 each disclose a laboratory centrifuge rotor designed according to the preamble of the main claim.

[0013] EP 3 485 977 A1 discloses a laboratory centrifuge rotor which has a slightly conical tapered cross-section starting from a rotor hub and lateral recesses into which a swing-out container can pivot. TASK OF INVENTION

[0014] The invention is based on the objective of proposing a laboratory centrifuge rotor which is particularly advantageous with regard to the mechanical stresses and the strength and / or the geometry and / or the material used has improved. SOLUTION

[0015] The object of the invention is achieved according to the invention by the features of the independent claim. Further preferred embodiments of the invention can be found in the dependent claims. DESCRIPTION OF THE INVENTION

[0016] The invention proposes a laboratory centrifuge rotor comprising (at least) one rotor arm extending radially to a rotor axis. A swing-out chamber pin is integrally connected to the rotor arm. In particular, the rotor arm and the swing-out chamber pin can thus be cast from a single piece.

[0017] The swing-out container pin serves to support a swing-out container, whereby the swing-out container pin defines a swing-out axis for the swing-out container.

[0018] A connection between the rotor arm and the swing-out container pin is made in the area of ​​a pin root. The pin root can be formed by the end region of the swing-out container pin, in particular an end region of the cylindrical bearing surface of the swing-out container pin facing the rotor arm, or an end region of a relief groove or, for example, a circular arc-shaped transition cross-section from the cylindrical bearing surface of the swing-out container pin to the rotor arm.

[0019] A transverse plane of the stump root runs through the stump root. A surface normal of this transverse plane corresponds to the axis of oscillation.

[0020] In this respect, the laboratory centrifuge rotor according to the invention can also be designed in accordance with the prior art, see also the embodiments mentioned at the outset.

[0021] The invention proposes that a relief notch be provided in the transition area between the discharge container pin and the rotor arm. The base of the relief notch is arranged on one side of the pin root's transverse plane, facing away from the discharge container pin. On this side, the base of the relief notch is offset from the pin root's transverse plane. Furthermore, according to the invention, the rotor arm has lateral recesses into which a discharge container mounted on the discharge container pin can pivot, and a constriction in the area of ​​the relief notch or in the area connecting to the relief notch in a top view. The constriction is dimensioned such that the cross-section of the rotor arm in the area of ​​the recesses does not deviate by more than 10% from the cross-section of the rotor arm in the area of ​​the constriction.

[0022] According to the invention, the rotor arm of the laboratory centrifuge rotor has lateral recesses into which a swing-out container mounted on the swing-out container pin can pivot. Such an embodiment is known in particular from patent application EP 3 485 977 A1 and the prior art described in that patent application, as well as from the prior art known from the relevant examination proceedings. The invention provides that the rotor arm has a constriction in the area of ​​the relief notch or in a connection area to the relief notch when viewed from above. The constriction is dimensioned such that the cross-section of the rotor arm in the area of ​​the recesses does not deviate by more than ±10% (preferably not more than ±8%, not more than ±6%, or not more than ±4%) from the cross-section of the rotor arm in the area of ​​the constriction.By using necking, further influence can be exerted on the stress distribution and thus the strength. On the other hand, necking can surprisingly reduce the amount of material required.

[0023] It has been shown that the use of the stress relief notch improves the stress distribution in the transition area between the swing-out chamber journal and the rotor arm, thus reducing stress maxima. In particular, a stress maximum, which, according to prior art embodiments, arises at a right-angled bend in the cylindrical bearing surface of the swing-out chamber journal to a boundary of the rotor arm extending along the transverse plane of the journal root, can be avoided or reduced. Surprisingly, according to the invention, material can also be saved in the area of ​​the stress relief notch without compromising mechanical strength, thus reducing the material required for manufacturing the laboratory centrifuge rotor. Furthermore, additional installation space can be created in the area of ​​the stress relief notch, which can be used for other purposes.

[0024] There are many possibilities for measuring the offset within the scope of the invention.

[0025] For one proposal of the invention, the offset is at least 3 mm (in particular at least 4 mm, at least 5 mm or at least 6 mm).

[0026] Alternatively or cumulatively, the offset may be at least 0.10 times (in particular at least 0.15 times or at least 0.20 times) the diameter of the swing-out container pin in the area of ​​the cylindrical bearing surface.

[0027] Alternatively or cumulatively, the offset may be at least 0.01 times (in particular at least 0.015 times or at least 0.2 times) the smallest distance of the swing axis from the rotor axis.

[0028] It has been shown that the aforementioned alternative or cumulative dimensions of the offset result in a particularly good stress distribution.

[0029] The invention also offers a variety of possibilities for shaping the relief notch, of which only a few are mentioned below (without limiting the invention to this): In a top view of the laboratory centrifuge rotor, corresponding to a viewing direction in the direction of the rotor axis, the relief notch can have a contour that can be curved with straight sections, arc-shaped sections, any curved sections, with or without a jump and / or with or without a kink.

[0030] In one embodiment of the invention, the stress relief notch, viewed from above, has a contour that maintains a continuous course between the rotor arm and the transverse plane of the trunnion root, without any breaks or kinks. It has been shown that avoiding breaks and / or kinks in the contour of the stress relief notch can lead to a further improvement in the stress distribution.

[0031] Furthermore, it is possible that the relief notch between the rotor arm and the peg root transverse plane has a profile that includes at least one straight section and at least one curved section, in particular a circular arc section.

[0032] Preferably, the relief notch extends from the rotor arm via a curved section and a straight section (preferably in that order) to the transverse plane of the pivot root. The radius of curvature of the curved section may be at least 1 mm (preferably at least 2 mm, at least 3 mm, at least 4 mm, or at least 6 mm, at least 8 mm, at least 10 mm, at least 12 mm, or at least 13 mm). Alternatively or cumulatively, the radius of curvature of the curved section may be at least 0.10 times (preferably at least 0.15 times or at least 0.20 times) the diameter of the swing-out chamber pivot and / or at least 0.01 times (preferably at least 0.015 times or at least 0.02 times) the smallest distance of the swing-out axis from the rotor axis.

[0033] Within the scope of the invention, it is entirely possible that the contour of the relief notch has a reciprocating shape, in that the relief notch exhibits curvatures in different directions. Preferably, the relief notch between the rotor arm and the transverse plane of the peg root is curved only in one direction, so that the curvature always has the same sign and there is no inflection point. However, it is also possible that the contour has a straight section, so that the curvature is 0 in this region.

[0034] Further considerations on which an embodiment of the invention is based concern the entry angle of the relief notch relative to a longitudinal axis of the rotor arm in the transverse plane of the pivot root. For one proposed embodiment of the invention, this entry angle of the entry notch is less than 130° (preferably less than 120°, less than 110°, less than 100°, less than 90°, less than 85° or less than 80°).

[0035] The invention also proposes a laboratory centrifuge rotor in which the relief notch, viewed from above, has a trough cross-section, which may also be U-shaped (possibly with rounded corners and diverging side legs). The trough cross-section may have a preferably straight base leg, forming the base that creates the offset relative to the transverse plane of the trunnion root. Side legs of the trough cross-section then diverge from the base. One side leg of the trough cross-section transitions into a side surface of the rotor arm, which may occur with or without a kink and / or with or without a jump. The other side leg of the trough cross-section then transitions directly into the trunnion root, which may occur with or without a kink and / or with or without a jump.The side legs of the tub cross-section (especially in their end regions facing away from the base) can be straight or curved.

[0036] In such an embodiment, a straight base leg forming the foundation can have any length. However, the invention proposes, for a preferred embodiment of the laboratory centrifuge rotor, that the base leg has a length of at least 5 mm (preferably at least 8 mm, at least 10 mm, or at least 12 mm). Alternatively or cumulatively, it is possible that the base leg has a length that is at least 0.17 times (preferably at least 0.34 times or at least 0.41 times) the diameter of the swing-out chamber pin, and / or that the base leg has a length that is at least 0.017 times (preferably at least 0.034 times or at least 0.041 times) the smallest distance of the swing-out axis from the rotor axis.

[0037] In one embodiment, the side leg of the trough cross-section has a radius of curvature of at least 5 mm (preferably at least 7 mm, at least 8 mm, or at least 9 mm). Alternatively or cumulatively, it is possible for the side leg of the trough cross-section to have a radius of curvature of at least 0.17 times (preferably at least 0.34 times or at least 0.41 times) the diameter of the swing-out container pin, and / or for the side leg of the trough cross-section to have a radius of curvature of at least 0.017 times (preferably at least 0.034 times or at least 0.041 times) the smallest distance of the swing-out axis from the rotor axis.

[0038] It is also possible that the end region of the side leg facing away from the base leg, which is connected to the rotor arm, has an angle of inclination of 110° to 150° (preferably 120° to 140° or 125° to 135°) relative to the base. Alternatively or cumulatively, it is possible that the end region of the side leg facing away from the base leg, which is connected to the swing-out chamber pin in the area of ​​the pin root, has an angle of inclination of 100° to 130° (preferably 110° to 125° or 105° to 115°) relative to the base.

[0039] The invention also includes embodiments in which the relief notch transitions via a transition area into the tang of the swing-out container tang, wherein this transition area may also extend along the transverse plane of the tang root. In particular, the relief notch terminates at a distance in the direction of the transverse plane of the tang root that is less than 3 mm (preferably less than 2 mm, less than 1.5 mm, less than 1 mm or less than 0.5 mm) or the relief notch terminates directly in the tang of the swing-out container tang.

[0040] Advantageous further developments of the invention result from the patent claims, the description and the drawings.

[0041] The advantages of features and combinations of features mentioned in the description are merely exemplary and can have an effect alternatively or cumulatively, without the advantages necessarily having to be achieved by embodiments according to the invention.

[0042] Regarding the disclosure content—not the scope of protection—of the original application documents and the patent, the following applies: Further features can be derived from the drawings—in particular, the geometries depicted and the relative dimensions of several components to one another, as well as their relative arrangement and functional connection. The combination of features from different embodiments of the invention or from features of different claims is also possible, deviating from the chosen cross-references of the claims, and is hereby encouraged. This also applies to features that are illustrated in separate drawings or mentioned in their description. These features can also be combined with features from different claims.Likewise, features listed in the patent claims may be omitted for further embodiments of the invention, but this does not apply to the independent patent claims of the granted patent.

[0043] The features mentioned in the claims and the description are to be understood, with regard to their number, as meaning that exactly that number or a greater number than that stated is present, without the need for the explicit use of the adverb "at least". Thus, for example, if a rotor arm or curve section is mentioned, this is to be understood as meaning that exactly one rotor arm or curve section, two rotor arms or curve sections, or more rotor arms or curve sections are present. The features listed in the claims may be supplemented by further features or may be the only features that the subject matter of the respective claim possesses.

[0044] The reference numerals contained in the patent claims do not constitute a limitation of the scope of the subject matter protected by the patent claims. They serve only the purpose of making the patent claims easier to understand. BRIEF DESCRIPTION OF THE FIGURES

[0045] The invention will now be further explained and described with reference to preferred embodiments shown in the figures. Figs. 1 to 4 show an embodiment of a laboratory centrifuge rotor according to the prior art. Fig. 5 shows a top view of a laboratory centrifuge rotor with swing-out containers at standstill. Fig. 6 shows a cross-section through the laboratory centrifuge rotor with swing-out containers according to Fig. 5 when cutting through the plane defined by the swing axes. Fig. 7 shows a detail of a laboratory centrifuge rotor according to Fig. 5 and 6in the area of ​​a holding bracket and a relief notch in a spatial view. Fig. 8 shows the detail of the rotor arm according to Fig. 7 in a top view. Fig. 9 shows a detail of a rotor arm in the area of ​​the relief notch and the swing-out container pin with dimensions as exemplified by a laboratory centrifuge rotor according to Figs. 5 to 8 They may have been chosen. Fig. 10 shows a detail of another embodiment of a laboratory centrifuge rotor in the area of ​​a holding bracket and a relief notch in a spatial view. Fig. 11 shows the detail of the laboratory centrifuge rotor according to Fig. 10 in a top view. Fig. 12 shows a detail of a laboratory centrifuge rotor with dimensions, as exemplified by a laboratory centrifuge rotor according to Fig. 10 and 11 They may have been chosen. FIGURE DESCRIPTION

[0046] Fig. 5Figure 1 shows an embodiment of a laboratory centrifuge rotor 1 with four rotor arms 4 with associated holding brackets 5 and swing-out container pins 6, which define swing-out axes 7, and four swing-out containers 8, wherein the laboratory centrifuge rotor 1 is at rest, so that the longitudinal axes of the swing-out containers 8 are oriented parallel to the rotor axis 3 and vertical to the plane of the drawing.

[0047] Fig. 6 shows a sectioned view when the section is made through a section plane defined by the swing axes 7.

[0048] In the spatial detail view of an end section of a rotor arm 5a according to Fig. 7 The rotor arm has 4 lateral recesses 11 into which the swing-out containers 8 can swing out (see EP 3 485 977 A1).

[0049] The rotor arm 4 transitions via a relief notch 12 of the retaining bracket 5 into the swing-out container pin 6.

[0050] As shown in particular in the top view of the end section of rotor arm 4 according to Fig. 8 As can be seen, the swing-out container pin 6 has a pin root 13, via which the swing-out container pin 6 transitions into the retaining bracket 5. In the illustrated embodiment, the pin root 13 is formed by the end region of a circular arc-shaped transition or relief 14 facing the retaining bracket 5, in the region of which the swing-out container pin 6 transitions into the retaining bracket 5.

[0051] This can be seen in the Fig. 7 and 8 The relief notch 12, viewed from above (i.e., from a perspective parallel to the rotor axis 3), has a trough cross-section 15. This trough cross-section 15 has a straight base leg 16, which forms a base 17 of the relief notch 12. Furthermore, the trough cross-section 15 has side legs 18, 19 that diverge from the base leg 16.

[0052] A transverse plane 20 of the tenon root extends vertically through the tenon root 13. The base 17 is arranged parallel to the transverse plane 20 of the tenon root and has an offset 21 relative to the transverse plane 20 of the tenon root.

[0053] The side legs 18, 19 are for the illustrated embodiment according to Fig. 8 The side leg 18 is curved. In this top view, the side leg 18 transitions into the contour of the rotor arm 4 without a kink or jump. In contrast, the side leg 19 transitions via a kink 22 into the transition or cutout 14 of the swing-out container pin 6 in the area of ​​the pivot root 13.

[0054] Also in the top view according to Fig. 8It can be seen that the rotor arm 4 has a constriction 23 in the connection area of ​​the mounting bracket 5. The constriction 23 is located in the run-out area of ​​the lateral recesses 11 of the rotor arm 4. The constriction 23 is dimensioned such that the cross-section of the rotor arm in the area of ​​the constriction 23 deviates from the cross-section of the rotor arm 4 in the area of ​​the recesses 11 by only a predetermined amount.

[0055] In Fig. 9 The end section of rotor arm 4 is dimensioned. It is particularly evident that... the base 17 has a longitudinal extent of 12.6 mm, the side leg 18 has a radius of 10.0 mm, the side leg 19 has a radius of 8.5 mm and the base 17 has an offset 21 of 6.0 mm relative to the peg root transverse plane 20.

[0056] Preferably, for this embodiment, one, several, or all dimensions may deviate by + / - 20% (in particular + / - 15%, + / - 10%, + / - 5% or + / - 2%) from the dimensions mentioned above.

[0057] In Fig. 9 It can be seen that it is possible for the side leg 18 to transition into the side contour of the rotor arm 4 over a radius of 1.0 mm.

[0058] In the area of ​​the constriction 23, for example, the transverse extent of the rotor arm 4 is at least 10% (preferably at least 20% or at least 25%) smaller than the transverse extent of the rotor arm 4 in the area of ​​the lateral recesses 11.

[0059] The trough cross-section 15 has on the one hand a straight section 24 formed by the base 17 and on the other hand curved sections 25 ,26 formed by the side legs 18, 19.

[0060] In Fig. 8An entry angle 27 is indicated, which defines the angle between a longitudinal axis of the rotor arm 4 and the orientation of the end region of the side leg 19 as it enters the journal root 13. For the in Fig. 8 In the illustrated embodiment, the inlet angle 27 is, for example, less than 90° or less than 80°.

[0061] In Figs. 10 to 12Another embodiment is shown. Here, the relief notch 12 has a curved section 25 extending from the rotor arm 4, to which a straight section 24 immediately connects, leading directly to the pivot root 13. The contour of the curved section 25 is preferably arc-shaped with a radius of 14 mm, while the longitudinal extent of the straight section 24 is preferably 4.7 mm. However, deviations from the aforementioned dimensions of the straight section 24 and the curved section of less than 20% (preferably less than 15%, less than 10%, or less than 5%) are also possible.

[0062] In the illustrated embodiment, the transition or relief 14 has a radius of 2 mm, while the transition from the straight section 24 to the tenon root 13 and the transition 14 can also have a radius of 2 mm. Deviations of less than + / - 20% (preferably less than + / - 15%, less than + / - 10%, or less than + / - 5%) are also possible with respect to these radii.

[0063] For the embodiment according to Figs. 10 to 12 The base 17 is formed by the area of ​​the relief notch 12, which has the greatest distance from the peg root transverse plane 20.

[0064] If dimensions are included in the figures, any other dimensions may also be used for embodiments encompassed by the invention. Preferably, the ratios of the dimensions are retained, although deviations of these ratios of + / - 5% or + / - 10% are also possible. It is also possible that the dimensions deviate from the specified dimensions by + / - 20%, + / - 10%, or + / - 5%.

[0065] In the illustrated embodiments, the mounting brackets 5 have V-shaped legs 9, 10, the bisector of which forms the longitudinal axis of the rotor arm 4. These two legs 9, 10 can be connected to each other by integrally formed support plates 28, which support plates 28 may also have recesses or bores 29 to reduce the material. REFERENCE MARK LIST

[0066] 1 Laboratory centrifuge rotor 2 Hub 3 Rotor shaft 4 Rotor arm 5 Mounting bracket 6 Swing-out chamber pin 7 Swing-out shaft 8 Swing-out chamber 9 Leg 10 Leg 11 Lateral recess 12 Relief notch 13 Pin root 14 Transition, clearance 15 Tub cross-section 16 Base leg 17 Base 18 Side leg 19 Side leg 20 Pin root transverse plane 21 Offset 22 Bend 23 Constriction 24 Straight section 25 Curved section 26 Curved section 27 Inlet angle 28 Support plate 29 Recess or bore 30 Inclination angle 31 Inclination angle 32 Inlet tangent

Claims

1. Laboratory centrifuge rotor (1) comprising a) a rotor arm (4) extending radially to a rotor axis (3) and b) a swing-bucket pivot (6) which ba) defines a swing axis (7) for a swing-bucket (8) supported on the swing-bucket pivot (6), bb) is connected in one piece to the associated rotor arm (4) and bc) defines a pivot base transverse plane (20) having a surface normal corresponding to the swing axis (7) and running through a pivot base (13) of the swing-bucket pivot (6), c) wherein in a transition region of the swing-bucket pivot (6) to the rotor arm (4) a relief notch (12) is provided, a basis (17) of the relief notch (12) being arranged ca) on the side of the pivot base transverse plane (20) facing away from the swing-bucket pivot (6) and cb) with an offset (21) from the pivot base transverse plane (20), characterized in that d) the rotor arm (4) da) comprises lateral recesses (11) into which a swing-bucket (8) supported on the swing-bucket pivot (6) can pivot and db) comprises a narrowing (23) in the region of the relief notch (12) or in a neighboring region of the relief notch (12) in a plan view and e) the narrowing (23) is dimensioned such that the cross section of the rotor arm (4) in the region of the recesses (11) does not deviate more than 10% from the cross section of the rotor arm (4) in the region of the narrowing (23).

2. Laboratory centrifuge rotor (1) of claim 1, wherein the offset (21) a) is at least 3 mm and / or b) is at least 0,10 times the diameter of the swing-bucket pivot (6) and / or c) is at least 0,01 times the smallest distance of the swing axis (7) from the rotor axis (3).

3. Laboratory centrifuge rotor (1) of claim 1 or 2, wherein the relief notch (12) has a steady curve without any step or kink between the rotor arm (4) and the pivot base transverse plane (20).

4. Laboratory centrifuge rotor (1) of one of the preceding claims, wherein the relief notch (12) has a curve between the rotor arm (4) and the pivot base transverse plane (20) which comprises at least one linear section (24) and at least one curved section (25, 26), in particular a circular arc section.

5. Laboratory centrifuge rotor (1) of claim 4, wherein the relief notch (12) extends from the rotor arm (4) via a curved section (25, 26) and a linear section (24) to the pivot base transverse plane (20), wherein preferably a radius of curvature of the curved section (25, 26) a) is at least 2 mm and / or b) is at least 0.10 times the diameter of the swing-bucket pivot (6) and / or c) is at least 0.01 times the smallest distance of the swing axis (7) from the rotor axis (3).

6. Laboratory centrifuge rotor (1) of one of the preceding claims, wherein the relief notch (12) has only a curvature in one single direction between the rotor arm (4) and the pivot base transverse plane (20).

7. Laboratory centrifuge rotor (1) of one of the preceding claims, wherein a running-in tangent (32) of the relief notch (12) comprises a running-in angle (27) in the pivot base transverse plane (20) relative to a longitudinal axis of the rotor arm (4) which is smaller than 130°.

8. Laboratory centrifuge rotor (1) of one of the preceding claims, wherein the relief notch (12) comprises a trough cross section (15) in a plan view with a) a preferably linear base leg (16) of the trough cross section (15), which forms the basis (17), and b) side legs (18, 19) of the trough cross section (15), which diverge from the basis (17), c) wherein one side leg (18) of the trough cross section (15) merges into a side surface of the rotor arm (4) and the other side leg (19) of the trough cross section (15) merges into the swing-bucket pivot (6).

9. Laboratory centrifuge rotor (1) of claim 8, wherein the base leg (16) a) has a length of at least 5 mm and / or b) has a length which is at least 0.17 times the diameter of the swing-bucket pivot (6), and / or c) has a length which is at least 0.017 times the smallest distance of the swing axis (7) from the rotor axis (3).

10. Laboratory centrifuge rotor (1) of claim 8 or 9, wherein at least one of the side legs (18; 19) a) has a radius of curvature of at least 5 mm and / or b) has a radius of curvature which is at least 0.17 times the diameter of the swing-bucket pivot (6), and / or c) has a radius of curvature which is at least 0.017 times the smallest distance of the swing axis (7) from the rotor axis (3).

11. Laboratory centrifuge rotor (1) of one of claims 8 to 10, wherein a) the end region of the side leg (18) which faces away from the base leg (16) and which is connected to the rotor arm (4) has an inclination angle (30) relative to the base leg (16) in the region from 110° to 150° and / or b) the end region of the side leg (19) which faces away from the base leg (16) and which is connected to the swing-bucket pivot (6), has an inclination angle (31) relative to the base leg (16) in the region of 100° to 130°.

12. Laboratory centrifuge rotor (1) of one of the preceding claims, wherein the relief notch (12) directly ends in the pivot base (13) of the swing-bucket pivot (6) or ends with a distance from the pivot base (13) in the direction of the pivot base transverse plane (20) which is smaller than or equals 2 mm.

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