anchorage point

Abstract

Anchoring point for fastening on an object to be fastened or to be carried, comprising a lower part (2) with a connecting member for connecting the anchoring point (1) to the object to be fastened or to be carried, which lower part contains a bearing sleeve (17), and comprising an upper part (3) rotatable relative to the lower part (2) and which is latched into the bearing sleeve (17) of the lower part (2) with a bearing section (18), in which anchoring point (1) the upper part (3) projects with its radially outer edge region (26) from the top side of the lower part (2), and between which edge region (26) of the upper part (3) bridging the lower part (2) and the lower part (2) a labyrinth seal is constructed, which is composed of a labyrinth projection (27) of a labyrinth recess (25) latched into the lower part side which is shaped on the upper part (3), wherein at least the radially outer wall (29) of the labyrinth recess (25) and the complementary radially inner rim (30) of the labyrinth projection (27) are complementarily curved in a defined section of their latching position, in which section both parts - upper part (3) and lower part (2) - can come into contact as a result of the tilting of the upper part (3) relative to the lower part (2) when the anchoring point (1) is stressed laterally.

Description

Technical Field

[0001] The present invention relates to an anchor point for fixing to an object to be fixed or transported, comprising a lower portion having a connecting member for connecting the anchor point to the object to be fixed and / or transported, the lower portion including a bearing sleeve, and an upper portion of the bearing sleeve rotatable relative to the lower portion and engaging with the lower portion by a bearing section. Background Technology

[0002] Such anchor points are typically used to lift objects. The anchor point is connected to the object to be lifted or secured by a connecting member, usually implemented as a bolt. In many cases, this anchor point is designed so that, when a lifting device with a hook into the connecting hole is present, the connecting hole is oriented according to the direction of the tension acting upon it. In this type of anchor point, the body supporting the arc segment of the connecting hole is constructed as the upper part, which is rotatable relative to the lower part supporting the connecting member. For anchor points used to secure objects, this characteristic is required even if the anchor point is not implemented as an anchoring swivel with an upper part that is rotatable relative to the lower part.

[0003] Sometimes, such anchor points are also used to apply tensile forces transverse to the longitudinal extension of the anchor point. To estimate or detect the angular position of the connecting eyelet, in the connection point disclosed in DE 10 2006 052 986 B4, a mark is installed on the outer side of the upper eyelet segment. For this purpose, an indexing component extending inward from the connecting eyelet is implemented as a complementary pointer. When the maximum lateral force exists in the transverse direction relative to the longitudinal extension of the anchor point (i.e., at the so-called 90° position relative to the longitudinal axis of the anchor point), this lateral force is introduced into the upper part of the anchor point. Such known anchor points can withstand large lateral forces. However, it is still necessary to improve the lateral force bearing capacity of such anchor points, especially with simpler components.

[0004] An anchoring point designed as an anchoring swivel is known from DE 20 2005 019 357 U1. In this anchoring point, the movement gap between the upper and lower parts is covered to prevent the intrusion of dirt. This is achieved by a gap diaphragm that covers the axial gap between the upper and lower parts. Its height is equivalent to the height of the maximum wear-related gap width between the upper and lower parts. If a gap still exists between these two parts despite the use of the gap diaphragm, the anchoring swivel can be discarded. In one feasible technical solution, the gap diaphragm is implemented as a labyrinth device.

[0005] Thus, in the connection point disclosed in DE 20 2016 906 871 U1, a labyrinth seal is also provided between the upper and lower parts to prevent dirt from being carried to the radially acting rolling element. The edges of this and other known labyrinth seal protrusions and (correspondingly) the walls of the labyrinth seal recesses are straight.

[0006] In the anchoring swivel known from DE 20 2005 019 357 U1, the upper bearing section, which engages with the lower bearing sleeve, is supported by a centrally arranged ball on the base of the bearing sleeve. In the radial direction, the upper part is supported relative to the inner wall of the lower part by a ball bearing. This ball also serves to lock the upper part axially relative to the lower part. For this purpose, the lower part has a ball delivery channel in which the balls required for the radial rolling bearing can be fed as rolling elements into complementary semi-recesses on the inner wall of the lower bearing sleeve and the sides of the upper bearing section.

[0007] To ensure the desired rotatability of the upper part relative to the lower part, a certain degree of clearance is required in the area supporting the upper part on the lower part—the bearing mating part. This anchoring point also needs to withstand a large lateral force, i.e., a force acting on the upper part, either entirely or partially, relative to the lower part and transverse to the axis of rotation of the upper part. Furthermore, even in the presence of unfavorable lateral forces, the upper part must be oriented in the direction of the applied tensile force. With respect to known connection points, if such a lateral force is applied, the rotatability of the upper part relative to the lower part may be weakened and hindered when the applied force is correspondingly large. This is because the labyrinth seal mating part becomes misaligned due to the upper part tilting relative to the lower part caused by the lateral force. This can be addressed by increasing the sealing clearance. However, this measure has the disadvantage of affecting the sealing effect produced by the labyrinth seal. Summary of the Invention

[0008] In view of this, the technical problem to be solved by the present invention is to improve the type of anchorage point described at the beginning of this document, thereby improving its lateral force bearing capacity.

[0009] The solution of the present invention to achieve the above-mentioned objective is, in one respect, an anchoring point of the same type as described at the beginning of this document, wherein the upper part protrudes from the top side of the lower part with its radially outer edge region, and a labyrinth-type sealing device is constructed between the radially outer edge region of the upper part and the lower part, which is composed of a labyrinth-type protrusion formed on the upper part that engages with the labyrinth-type recess on the lower side, wherein at least the outer wall of the labyrinth-type recess and the outer edge of the labyrinth-type protrusion are complementaryly curved in a defined section of their engagement position, in which the two parts—the upper part and the lower part—can contact each other when the anchoring point is subjected to lateral force due to the inclination of the upper part relative to the lower part.

[0010] In the anchoring point proposed in this first solution, the sections of the labyrinth seal that contact when the upper part is inclined relative to the lower part are complementaryly curved. This means that when the upper part is inclined relative to the lower part, the labyrinth seal creates surface contact in the sections where it contacts due to lateral forces at the anchoring point. Therefore, force transmission from the upper to the lower part is achieved through this contact surface section, effectively suppressing the notch effect within the labyrinthine notch in the lower part. In this way, the lower part can absorb a correspondingly larger lateral force without tearing. Simultaneously, the rotatability of the upper part relative to the lower part is maintained to a sufficient degree, as this rotatability does not decrease significantly or become impeded due to point or line force peaks as in the prior art. In this anchoring point, the gap size of the labyrinth seal device is sufficiently small based on the special design of the mating profile of the labyrinth seal, effectively preventing dirt from entering the bearing mat between the upper and lower parts or reducing it to an acceptable level.

[0011] Unlike known anchor points, in this type of anchor point, the upper part is tilted to a certain extent relative to the lower part when subjected to lateral force. This tilt is used to provide additional support to the upper part relative to the lower part through the contact area between the two labyrinth seal mating parts when subjected to corresponding lateral force, without affecting the swirl characteristics of the anchor point (Wirbeleigenschaft).

[0012] Preferably, the cross-section of the labyrinthine notch is curved overall, not just in the area of ​​the possible contact surface with the upper labyrinthine protrusion. This further suppresses the notch effect within the labyrinthine notch.

[0013] Typically, the upper labyrinthine protrusion is convex, and the lower labyrinthine recess is concave. According to one technical solution, the bending radius is constant. According to another technical solution, the bending radius of the labyrinthine recess is only slightly larger than that of the labyrinthine protrusion, thereby providing the desired movement clearance when the anchor point is under axial force. In another technical solution, the bending radius of the convex labyrinthine sealing element in the possible contact area is several degrees larger than the bending radius of the complementary convex section of the other labyrinthine sealing element. When the upper and lower parts come into contact under lateral force, the lateral force is transferred from the upper part to the lower part in both contact areas; therefore, this measure also significantly improves the lateral force bearing capacity of the anchor point.

[0014] In one improved embodiment, the upper bearing section that engages with the bearing sleeve is positioned radially away from the upper rotation axis relative to the base of the lower bearing sleeve supported on the bearing. Therefore, when the upper part is subjected to lateral force, it is supported on the bearing body within the area of ​​the base of its cylindrical bearing section. This measure limits the degree of tilting of the upper part relative to the lower part when subjected to lateral force. Of course, the support of the upper bearing section that engages with the lower bearing sleeve is achieved by combining radial support between the two parts, typically implemented as a rolling bearing, for example, a ball bearing. Simultaneously, the swivel function of the anchor point... This also remains unchanged under these circumstances.

[0015] This type of bearing can be implemented as a rolling bearing. The rolling elements of this rolling bearing can be cylindrical, thus the rolling bearing is implemented as a needle roller bearing.

[0016] According to another technical solution, a bearing washer is provided as a bearing body, and the upper bearing section is supported on the bearing washer relative to the base of the lower bearing sleeve.

[0017] Furthermore, the base of the upper bearing section can be supported on the base of the lower bearing sleeve by a centrally arranged support ball. Attached Figure Description

[0018] The present invention will now be described with reference to the embodiments shown in the accompanying drawings. Wherein:

[0019] Figure 1 This is a side view of the anchoring point of the present invention.

[0020] Figure 2 for Figure 1 The cross-sectional view of the anchor point along line AB.

[0021] Figure 3 for Figure 1 The top view of the lower part after removing the anchor points in the middle.

[0022] Figure 4 The diagram shows a partial longitudinal cross-sectional view of the upper end of the lower part and the lower section of the upper part in their normal positions, and...

[0023] Figure 5 for Figure 1 The image shows a partial longitudinal section of the anchor point, where the upper part of the anchor point is engaged with the lower bearing sleeve by its bearing section under the action of lateral force. Detailed Implementation

[0024] Anchor point 1 is used to connect an object for transport, i.e., lifting, securing, or similar purposes, depending on the specific situation. Anchor point 1 has a lower part 2 and an upper part 3. The upper part 3 is rotatably supported relative to the lower part 2. The lower part is connected to a bolt 4, the threaded section 5 of which is used to connect anchor point 1 to the object to be transported by screwing the threaded section into a correspondingly prepared internal threaded hole in the object. The upper part 3 carries an eyelet segment 6, which forms an eyelet together with a part of the body 7 of the upper part 3. A connecting eyelet 8 is hooked into the eyelet segment 6. The connecting eyelet 8 serves to allow lifting or securing components (such as hooks, ropes, belts, or similar components) to be connected to the connecting eyelet. The connecting eyelet 8 is asymmetrical in terms of its longitudinal extension and has a first arc segment 9 with a larger radius and a second arc segment 10 with a smaller radius. The connecting eyelet 8 hooks into and can be hinged to the eyelet segment 6 of the upper part 3 with its smaller radius arc segment 10. In the illustrated embodiment, the sides 11 and 11.1 that connect the two arc segments 9 and 10 are straight and inclined to each other, so that the inner cavity surrounded by the connecting hole 8 gradually narrows towards the arc segment 10.

[0025] The upper end of the lower part 2 carries a radially projecting, thus protruding, annular flange 12. This annular flange has a rounded outer geometric profile. In the illustrated embodiment, the diameter of the annular flange 12 is equivalent to the diameter of the lower abutment flange 13 of the lower part 2, which is tensioned with its bottom side 14 relative to the surface of the object to be transported. In the illustrated embodiment, the material thickness of the annular flange 12 is slightly less than the material thickness of the abutment flange, approximately 80% of the material thickness of the abutment flange 13. To connect the lower part 2 to the object to be transported, the radially outer surface of the lower part has several wrench faces 15. In the illustrated embodiment, these wrench faces are arranged in a manner similar to a hexagonal nut. The annular flange 12 protrudes radially from the wrench faces 15, thus providing effective tear protection not only for the upper part 3 but also for the tool (typically an open-end wrench) used to tension the lower part 2 of the anchor point 1 to the object to be transported. In the illustrated embodiment, the annular flange 12 also extends radially from the rounded edge section 16, which connects two adjacent wrench faces 15 at an angle to each other. In the illustrated embodiment, the annular flange 12 has the same diameter as the abutment flange 13.

[0026] The lower part 2 of anchor point 1 is manufactured as a forging, wherein, through the forging process, the lower part 2 has unstructured sides in its longitudinal direction. The wrench face profile is inserted into the lower part by milling.

[0027] The lower part 2 has the same material thickness radially around its terminal end pointing towards the upper part 3 via the annular flange 12. This design prevents the lower part 2 from being weakened by the wrench face 15 arranged on its outer side. Therefore, the annular flange 12 provides reinforcement in addition to the aforementioned anti-slip function.

[0028] At anchor point 1 Figure 2 In the cross-section shown, the connecting eyelet 8 is not shown. It is clear from this cross-sectional view that the annular flange 12 protrudes from the wrench face 15 and, in this embodiment, also from the edge section 16 that connects adjacent wrench faces 15. Figure 2 The cross-sectional view also shows the bearing sleeve 17 of the lower part 2 and the bearing section 18 of the upper part 3 that is inserted into the bearing sleeve. The upper part 3 is connected to and supported relative to the lower part 2 by ball bearings. In this figure, for clarity, only a ball 19 arranged in a circular pattern in a complementary ball bearing recess is shown.

[0029] As shown in the cross-sectional view, the tool attached to anchor point 1 cannot slip off the wrench face 15 along the axial direction.

[0030] Figure 3 This is a perspective view of the lower bearing sleeve 17 after the upper part 3 has been removed. A support ball 20 is centrally arranged within the bearing sleeve 17, and the cylindrical bearing section 18 of the upper part 3 rests on this support ball with its base, i.e., its bottom side, and is thus supported thereon. The ball 20 is inserted into the ball receiving portion of the bearing section 18 and the base 21 of the bearing sleeve 17 (see...). Figure 5 An annular needle roller bearing 22 is provided on the base 21 of the bearing sleeve 17, with its cylindrical rolling elements 23 arranged star-shaped or planetary relative to the lower part 2 around the rotation axis D of the upper part 3. The rolling elements 23 are held in a rolling element bearing cage. The needle roller bearing 22 is arranged in an annular recess inserted into the base 21 and its rolling elements 23 protrude from the annular recess only to the extent necessary to support the bearing section 18.

[0031] A surrounding labyrinthine notch 25 is inserted into the top side 24 of the lower part 2. This labyrinthine notch can... Figure 4 As seen in the cross-sectional view of anchor point 1, the cross-sectional orientation of the labyrinthine notch 25 is curved with a constant radius, at least in its main section. The upper part 3 protrudes from the top side 24 of the lower part 2. Within the radially outer edge region 26 of this protrusion, a labyrinthine protrusion 27 is arranged extending downwards from the upper part 3. Its contour, which engages with the labyrinthine notch 25, is also curved with a constant radius. This ensures axial alignment between the lower part 2 and the upper part 3. Figure 4 The bending radius of the labyrinthine protrusion 27 is slightly smaller than that of the labyrinthine recess 25, representing the distance of motion. Figure 4As shown in the cross-sectional view, this provides a radially acting labyrinth seal to prevent dirt from entering the bearing sleeve 17 and thus affecting the function of the ball 19 in supporting the upper bearing section 18 of the upper 3 on the inner wall of the lower bearing sleeve 17.

[0032] Figure 4 This is a view of the anchor point 1 with upper part 3 and lower part 2 in its normal position. For example, when there is a tensile force acting axially on upper part 3 through connecting hole 8, upper part 3 is in this normal position relative to lower part 2. Figure 5 The figure shows a partial longitudinal cross-sectional view of anchor point 1. It can be seen that the bearing section 18 is supported on the bottom side of the rolling element 23 on the base 21 of the lower part 2, and the support method is also shown by the support ball 20. Figure 5 It shows that it has been applied. Figure 1 The block-shaped arrow indicates anchor point 1 for the lateral force. This force acts in a direction approximately 90° angled to the rotation axis D of the upper part 3. Due to the necessary movement clearance between the upper part 3 and the lower part 2, the upper part 3 tilts relative to the lower part 2 when the corresponding force is applied. This situation occurs in... Figure 5 As shown in the diagram, on the side away from the tension, the labyrinthine gap 28 increases due to its tilt, while on the side facing the tension, it decreases, thus creating abutment between the labyrinthine protrusion 27 and the curved surface of the labyrinthine recess 25. This point is achieved through... Figure 5 The oblique direction indicated by the block-shaped arrow occurs on the radial outer wall 29 of the labyrinthine recess 25 and the radial outer edge 30 of the labyrinthine protrusion 27 of the upper part 3. The above situation occurs in... Figure 5 As can be clearly seen in the enlarged partial views, based on the aforementioned contours of the two labyrinthine sealing mating parts (labyrinthine protrusion 27 and labyrinthine recess 25), particularly in their radially outer sections, surface contact is achieved between the two parts (lower part 2 and upper part 3). This prevents notch effects from occurring within the labyrinthine recess 25 and hinders the rotational movement of the upper part 3 relative to the lower part 2. Therefore, the upper part 3 can easily orient itself toward the applied tensile force even under such loads.

[0033] Tests show that this connection point withstands approximately 10% higher lateral forces compared to similar connection points with conventional labyrinth seals. The sealing mating parts in this type of connection point have flat sides and do not include needle roller bearings 22 integrated into the base 21 of the bearing sleeve 17. The invention also finds that wear in or on the bearing mating parts can be significantly reduced, thereby greatly extending the service life of this anchoring point 1 before disposal.

[0034] In the illustrated embodiment, the tear resistance of the anchor point 1 is also enhanced by the annular flange 12. Compared to anchor points of the same size without the aforementioned features, this anchor point 1, with the combination of the aforementioned measures, is fully capable of withstanding lateral forces greater than 10%.

[0035] This invention has been described in conjunction with several embodiments. Numerous other ways of implementing this invention will be apparent to those skilled in the art without departing from the scope of the claims, and are not listed herein.

[0036] List of reference numerals

[0037] 1 Anchor point

[0038] 2 lower part

[0039] 3 upper part

[0040] 4 bolts

[0041] 5 threaded sections

[0042] 6-hole eye segment

[0043] 7Ontology

[0044] 8 connecting holes

[0045] 9 arc segments

[0046] 10 arc segments

[0047] 11 sides

[0048] 12-ring flange

[0049] 13. Flange

[0050] 14 Bottom side

[0051] 15 wrench face

[0052] 16 edge sections

[0053] 17 bearing sleeve

[0054] 18 bearing section

[0055] 19 spheres

[0056] 20 Support Balls

[0057] 21 base

[0058] 22 needle roller bearing

[0059] 23 Rolling elements

[0060] 24 top side

[0061] 25 labyrinthine notch

[0062] 26 Radial outer edge region

[0063] 27 Labyrinthine protrusions

[0064] 28 labyrinthine gaps

[0065] 29 outer wall

[0066] 30 edge

[0067] D-axis of rotation

Claims

1. An anchor point for fixing to an object to be fixed or transported, comprising a lower portion (2) having a connecting member for connecting the anchor point (1) to the object to be fixed or transported, the lower portion including a bearing sleeve (17) and an upper portion (3) of the bearing sleeve (17) rotatably engaged with the lower portion (2) by a bearing section (18), wherein the upper portion (3) overhangs from the top side of the lower portion (2) with its radially outer edge region (26) in the anchor point (1), and the radially outer edge region (26) of the upper portion (3) bridging the lower portion (2) A labyrinthine sealing device is constructed between the upper part (3) and the lower part (2), the labyrinthine sealing device being formed by a labyrinthine protrusion (27) formed on the upper part (3) that engages with the labyrinthine recess (25) on the lower side, wherein at least the radial outer wall (29) of the labyrinthine recess (25) and the complementary radial inner edge (30) of the labyrinthine protrusion (27) are complementaryly curved in a defined section of their engagement position, in which the upper part (3) and the lower part (2) can come into contact when the anchor point (1) is subjected to lateral force due to the inclination of the upper part (3) relative to the lower part (2).

2. The anchoring point according to claim 1, characterized in that, In the possible contact area between the labyrinthine notch (25) and the labyrinthine protrusion (27), the labyrinthine protrusion (27) is convexly curved and the labyrinthine notch (25) is concavely curved.

3. The anchoring point according to claim 2, characterized in that, The convex labyrinthine protrusion (27) has a radius of curvature in the possible contact area that is slightly larger than the radius of the labyrinthine notch (25).

4. The anchoring point according to claim 3, characterized in that, The entire labyrinthine protrusion (27) is convex in cross-section, and the labyrinthine recess (25) is concave in cross-section.

5. The anchoring point according to claim 4, characterized in that, The bend has a constant radius over its extension.

6. The anchoring point according to any one of claims 1 to 5, characterized in that, The bearing section (18) of the upper part (3) that is inserted into the bearing sleeve (17) of the lower part (2) is supported on the base of the bearing sleeve (17) by the bearing (22).

7. The anchoring point according to claim 6, characterized in that, The bearing refers to a rolling bearing having a plurality of rolling elements (23) arranged in a star shape at a radial distance from the rotating shaft (D) of the upper part (3).

8. The anchoring point according to claim 7, characterized in that, The rolling element (23) is held in the rolling element bearing cage.

9. The anchoring point according to claim 7 or 8, characterized in that, The rolling element is a cylinder, therefore the rolling bearing is a needle roller bearing.

10. The anchoring point according to claim 6, characterized in that, The bearing is a sliding bearing with a bearing washer disposed between the base of the bearing sleeve and the end side of the upper bearing section.

11. The anchoring point according to claim 6, characterized in that, A support ball (20) is arranged concentrically with the bearing (22), and the bearing section (18) of the upper part (3) is placed on the support ball.

12. The anchoring point according to claim 1, characterized in that, The upper part (3) is supported by a rolling bearing on the side of the bearing section (18) of the bearing sleeve (17) of the lower part (2) relative to the inner wall of the bearing sleeve (17) of the lower part (2).

13. The anchoring point according to claim 7, characterized in that, The bearing housing of this rolling bearing is a ball (19).

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