Anti-loosening locking structure of bolt fastener

Abstract

The present invention discloses an anti-loosening locking structure for a bolt fastener, comprising a bolt body, wherein the bolt body is threadedly connected to an external device, an adjusting mechanism is arranged on the bolt body, a one-way disk on a bottom plate is fitted on the external device, a pressing sleeve is installed on the bolt body, and the one-way disk on a top plate abuts against the pressing sleeve, and the adjusting mechanism realizes flexible adjustment of the anti-loosening locking state of the bolt fastener through the coordinated work of components such as the bottom plate, the top plate, the one-way disk, the pressing sleeve, the fixing rod and the fixing ring, respectively, the one-way disks on the bottom plate and the top plate cooperate with the fixing rods to provide a reliable anti-loosening effect, the design of the fixing rod and the fixing groove allows for rapid switching between the tightening and pre-fixing states, and the configuration of the unfastening groove and the unfastening ring further enhances the flexibility of adjustment and improves the durability of the structure, and these designs jointly improve the adaptability and service life of the bolt fastener, so that it can better meet the needs under different working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of bolt fasteners, and more particularly to an anti-loosening locking structure of a bolt fastener. Background Art

[0002] In the field of modern industry and machinery, bolt fasteners, as a common and important connecting element, are widely used in the assembly of various equipment and structures. However, the anti-loosening locking structure of bolt fasteners commonly used in the market has a significant limitation. During the use of this structure, when the operator tightens the bolt, only a single tightening method can be selected, which means that once the bolt is tightened, it is fixed and cannot be flexibly adjusted according to actual needs. This design deficiency limits the adaptability of bolt fasteners in different working environments and conditions, and may result in excessive or insufficient tightening effect in some cases.

[0003] The problems caused by this design defect are particularly prominent in application scenarios that require frequent adjustments or face changing working conditions. For example, in larger mechanical equipment, pre-fixation may be required according to the situation. However, the existing anti-loosening locking structure cannot meet the needs of such flexible adjustment, which not only increases the difficulty of maintenance and adjustment, but may also affect the overall performance and service life of the equipment. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the problems existing in the prior art, the present invention provides an anti-loosening and locking structure of a bolt fastener to solve the technical problems mentioned in the background technology.

[0006] (II) Technical solution

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an anti-loosening locking structure of a bolt fastener, comprising a bolt body, the bolt body being threadedly connected to an external device, an adjusting mechanism being arranged on the bolt body, the adjusting mechanism comprising a bottom plate, a top plate, a one-way plate, a pressing sleeve, a fixing rod, a fixing ring, a synchronization mechanism and a telescopic mechanism, the bottom plate and the top plate are respectively provided with a one-way plate, the one-way plate on the bottom plate is fitted on the external device, a pressing sleeve is arranged on the bolt body, the one-way plate on the top plate abuts against the pressing sleeve, the top plate and the bottom plate are fitted with each other, and the top plate and the bottom plate are respectively rotatably connected to the bolt body, a plurality of fixing rings are respectively arranged on the bottom plate and the top plate along the axis, a plurality of fixing grooves are respectively and equidistantly provided on the plurality of fixing rings, a fixing rod is respectively slidably connected in each of the fixing grooves, and the synchronization mechanism and the telescopic mechanism are respectively installed on the top plate and the bottom plate.

[0008] The present invention is further configured such that each of the fixing rods is respectively provided with a plurality of unlocking grooves, and the bottom plate and the top plate are provided with a plurality of unlocking rings, and the unlocking grooves and the unlocking rings are arranged in parallel. This design realizes the flexible unlocking function of the fixing rod through the cooperation of the unlocking grooves and the unlocking rings, so that the bolt fastener can be quickly switched between the fixed state and the pre-fixed state, greatly improving the convenience and efficiency of adjustment.

[0009] The present invention is further configured such that the plurality of the untying rings and the plurality of the fixing rings are staggered, and the plurality of the fixing grooves and the fixing rods are respectively provided with rounded corners. This staggered arrangement increases the stability of the structure, and the rounded corner design reduces stress concentration, improves the durability and service life of the components, and overall improves the reliability and safety of the bolt fasteners.

[0010] The present invention is further configured as follows: the telescopic mechanism includes a contact ring, a push spring and a lifting plate; the contact ring is sleeved on the bottom plate and the contact ring is pressed against external equipment; a plurality of push springs are provided, and the two ends of the plurality of push springs are respectively connected to the contact ring and the lifting plate; the lifting plate is slidably connected to the bottom plate; this design provides stable elastic support through the cooperation of the contact ring and the push spring; and the overall structure enhances the adaptability and seismic resistance of the bolt fastener.

[0011] The present invention is further configured such that parallel plates are respectively provided on the plurality of fixed rods, the parallel plates are slidably fitted between the bottom plate and the top plate, each of the parallel plates is respectively provided with a transverse rod, the transverse rod and the fixed rod are coaxially arranged, and each of the transverse rods is respectively provided with a follower ball. This design realizes the positioning and smooth movement of the fixed rod through the cooperation of the parallel plates and the transverse rods, and the provision of the follower ball increases the flexibility of adjustment, thereby improving the adjustment accuracy and operating convenience of the bolt fastener as a whole.

[0012] The present invention is further configured such that a plurality of folding plates are equidistantly provided on the upper end surface of the lifting plate, each of the folding plates is respectively provided with an oblique groove, a transverse rod is slidably connected in the oblique groove, and a follower ball is slidably connected to an outer wall of the folding plate, each of the folding plates is respectively provided with a bottom groove, and the bottom groove and the oblique groove are arranged in parallel. This design realizes precise guiding of the transverse rod through the cooperation of the folding plate and the oblique groove, and the arrangement of the bottom groove provides additional positioning options, and the overall structure greatly improves the accuracy and diversity of adjustment.

[0013] The present invention is further configured such that a plurality of fixing blocks are equidistantly arranged on the upper end surface of the lifting plate along the axis, and a middle groove is respectively opened on the plurality of fixing blocks, and the plurality of fixing blocks and the plurality of folding plates are respectively staggered. This design provides multi-level fixing options through the cooperation of the fixing blocks and the middle grooves, and the staggered arrangement increases the stability of the structure, and overall improves the adjustment flexibility and use reliability of the bolt fasteners.

[0014] The present invention is further configured such that the synchronization mechanism includes a fitting ring and an embedded ring, the inner rings are coaxially installed on the top plate and the bottom plate respectively, a fitting ring is rotatably installed in each of the inner rings respectively, and a plurality of tension springs are arranged between the two fitting rings. This design realizes the rotational connection between the top plate and the bottom plate through the cooperation of the fitting ring and the inner ring, and the setting of the tension spring provides an elastic return function, and the overall structure improves the stability of the adjustment.

[0015] The present invention is further configured such that synchronization grooves are coaxially opened on the top disk and the bottom disk, and synchronization sleeves are slidably provided in the two synchronization grooves. This design realizes the alignment of the top disk and the bottom disk through the cooperation of the synchronization grooves and the synchronization sleeves, ensures that the two remain synchronized during the adjustment process, and improves the adjustment accuracy and stability of the bolt fasteners.

[0016] The present invention is further configured such that the two fitting rings fit on the inner wall of the synchronization sleeve, and the fitting ring and the synchronization sleeve are coaxially arranged. This design further enhances the stability of the synchronization mechanism through the close fit of the fitting ring and the synchronization sleeve, and the coaxial arrangement ensures the symmetry and balance of the entire structure, thereby improving the adjustment performance and service life of the bolt fastener as a whole.

[0017] (III) Beneficial effects

[0018] Compared with the prior art, the present invention provides an anti-loosening and locking structure for a bolt fastener, which has the following beneficial effects:

[0019] 1. The adjustment mechanism realizes the flexible adjustment of the anti-loosening locking state of the bolt fastener through the coordinated work of components such as the bottom plate, top plate, one-way plate, pressure sleeve, fixing rod and fixing ring. The one-way plates on the bottom plate and the top plate cooperate with the fixing rod respectively to provide a reliable anti-loosening effect. The design of the fixing rod and the fixing groove allows for quick switching between the tightening and pre-fixing states. The configuration of the release groove and the release ring further enhances the flexibility of adjustment. The rounded corner design reduces stress concentration and improves the durability of the structure. These designs together improve the adaptability and service life of the bolt fasteners, enabling them to better meet the needs of different working conditions.

[0020] 2. The telescopic mechanism is mainly composed of a contact ring, a push spring, a lifting plate, a parallel plate, a transverse rod, a follower ball, a folding plate and a fixed block. The design of the contact ring and the push spring provides stable elastic support. The cooperation of the lifting plate and the folding plate realizes the precise control of the position of the fixed rod. The setting of the parallel plate and the transverse rod ensures the smooth movement of the fixed rod. The design of the follower ball and the inclined groove increases the flexibility of adjustment. The configuration of the bottom groove and the middle groove provides multi-level fixing options. The synergistic effect of these components not only improves the accuracy and stability of the fixed rod adjustment, but also optimizes the seismic performance of the entire system, thereby improving the reliability of the bolt fasteners under various working conditions.

[0021] 3. The synchronization mechanism includes components such as a fitting ring, an embedded ring, a tension spring, a synchronization groove and a synchronization sleeve. The design focus is on achieving synchronous adjustment between the top disk and the bottom disk. The cooperation of the fitting ring and the embedded ring provides stable rotation support. The setting of the tension spring ensures the elastic connection between the two fitting rings. The design of the synchronization groove and the synchronization sleeve realizes the precise alignment of the top disk and the bottom disk. These designs not only improve the consistency of the adjustment process, but also enhance the stability and reliability of the entire structure, thereby significantly improving the performance and life of the bolt fasteners during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of an anti-loosening locking structure of a bolt fastener in the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the top plate and the bottom plate in the present invention;

[0024] Figure 3 For the present invention Figure 2 A partial enlarged view of middle A;

[0025] Figure 4 For the present invention Figure 2 A schematic cross-sectional structure diagram of ;

[0026] Figure 5 For the present invention Figure 4 A partial enlarged view of B;

[0027] Figure 6 It is a schematic diagram of the exploded cross-sectional structure of the bottom plate and the top plate in the present invention;

[0028] Figure 7 It is a schematic diagram of the structure of the bottom plate in the present invention;

[0029] Figure 8 It is a structural schematic diagram of the fixing rod in the present invention;

[0030] Fig. 9 It is a structural schematic diagram of the lifting plate in the present invention.

[0031] In the figure: 1. bolt body; 2. bottom plate; 3. top plate; 4. one-way plate; 5. pressing sleeve; 6. fixing rod; 7. fixing ring; 8. fixing groove; 9. releasing groove; 10. releasing ring; 11. fillet; 12. resistance circle; 13. push spring; 14. lifting plate; 15. parallel plate; 16. transverse rod; 17. follow-up ball; 18. folding plate; 19. oblique groove; 20. bottom groove; 21. fixing block; 22. middle groove; 23. fitting ring; 24. embedded ring; 25. tension spring; 26. synchronization groove; 27. synchronization sleeve. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0034] In the present invention, unless otherwise specified, the directions used, such as "up" and "down", usually refer to the directions shown in the drawings, or to the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directions are not used to limit the present invention.

[0035] See also Figures 1 to 8 A bolt fastener anti-loosening locking structure comprises a bolt body 1, the bolt body 1 is threadedly connected to an external device, an adjustment mechanism is arranged on the bolt body 1, the adjustment mechanism comprises a bottom plate 2, a top plate 3, a one-way plate 4, a pressing sleeve 5, a fixing rod 6, a fixing ring 7, a synchronization mechanism and a telescopic mechanism, the bottom plate 2 and the top plate 3 are respectively provided with a one-way plate 4, the one-way plate 4 on the bottom plate 2 is fitted on the external device, a pressing sleeve 5 is installed on the bolt body 1, the one-way plate 4 on the top plate 3 is in contact with the pressing sleeve 5, the top plate 3 and the bottom plate 2 are fitted with each other, and the top plate 3 and the bottom plate 2 are respectively rotated and connected Connected to the bolt body 1, a plurality of fixing rings 7 are respectively arranged along the axis on the bottom plate 2 and the top plate 3, a plurality of fixing grooves 8 are respectively arranged at equal intervals on the plurality of fixing rings 7, a fixing rod 6 is respectively slidably connected in each fixing groove 8, a synchronization mechanism and a telescopic mechanism are respectively installed on the top plate 3 and the bottom plate 2, a plurality of unfastening grooves 9 are respectively arranged on each fixing rod 6, a plurality of unfastening rings 10 are respectively arranged on the bottom plate 2 and the top plate 3, the unfastening grooves 9 and the unfastening rings 10 are arranged in parallel, a plurality of unfastening rings 10 and a plurality of fixing rings 7 are arranged in an alternating manner, and a plurality of fixing grooves 8 and the fixing rod 6 are respectively provided with rounded corners 11.

[0036] Working principle: when the bolt body 1 and the external device need to be locked to prevent loosening, at this time, multiple fixing rods 6 are respectively in the position of the fixing grooves 8, and then the bottom plate 2 and the top plate 3 are respectively sleeved on the bolt body 1, and then the one-way plate 4 at the upper end is clamped on the pressing sleeve 5, and the one-way plate 4 at the lower end is clamped on the outer wall of the external device. At this time, the bolt body 1 and the external device are threadedly connected. When tightening, the one-way plate 4 rotates in the forward direction and the one-way plate 4 does not work at this time, so it can continue to rotate, and then the two one-way plates 4 are respectively fixed and clamped on the pressing sleeve 5 and the external device. At this time, the top plate 3 and the bottom plate 2 are pressed against each other, and the fixing grooves 8 at the upper and lower ends are respectively clamped on the fixing rods 6, and The corresponding extrusion force is applied, and the fixing process is completed. When the equipment vibrates, the bolt body 1 and the equipment connection are loosened. Due to the movement along the thread of the bolt body 1, it rotates and rises at the same time. Due to the reverse rotation, the upper one-way disk 4 will rotate with the pressure sleeve 5, and the lower one-way disk 4 will not rotate. When rotating, the top disk 3 will rise with the pressure angle of the thread, but the pressure angle between the fixing groove 8 and the fixing rod 6 is much larger than the pressure angle of the bolt body 1 thread. Therefore, when the bolt body 1 rotates, the distance rising between the fixing groove 8 and the fixing rod 6 for each degree of rotation is much larger than the distance rising of the thread. Therefore, it will prevent the bolt body 1 from rotating along the thread, thereby ensuring the stability of use.

[0037] When the bolt body 1 needs to be pre-fixed, it cannot be in a stable state. You only need to pull the fixing rod 6 outward so that the fixing rod 6 contacts the inner walls of the bottom plate 2 and the top plate 3. At this time, the unfastening groove 9 is slidably connected in the fixing ring 7, and the fixing rod 6 is slidably connected in the unfastening ring 10. Therefore, the two will not be fixed. When they need to be unfastened, you only need to provide reverse force to unfasten them, thereby ensuring the convenience of pre-fixing.

[0038] In order to realize the lateral movement of the fixed rod 6, a telescopic mechanism is added. Figures 2 to 9The telescopic mechanism includes a contact ring 12, a push spring 13 and a lifting plate 14. The contact ring 12 is sleeved on the bottom plate 2, and the contact ring 12 is pressed against the external equipment. A plurality of push springs 13 are provided, and the two ends of the plurality of push springs 13 are respectively connected to the contact ring 12 and the lifting plate 14. The lifting plate 14 is slidably connected to the bottom plate 2. A plurality of fixed rods 6 are respectively provided with parallel plates 15. The parallel plates 15 are slidably fitted between the bottom plate 2 and the top plate 3. Each parallel plate 15 is respectively provided with a transverse rod 16. The transverse rod 16 and the fixed rod 6 are coaxially arranged. Each transverse rod 16 A follower ball 17 is respectively provided on the upper end surface of the lifting disk 14, a plurality of folding plates 18 are equidistantly provided, each folding plate 18 is respectively provided with an inclined groove 19, the transverse rod 16 is slidably connected in the inclined groove 19, and the follower ball 17 is slidably connected to the outer wall of the folding plate 18, each folding plate 18 is respectively provided with a bottom groove 20, the bottom groove 20 and the inclined groove 19 are arranged in parallel, a plurality of fixed blocks 21 are equidistantly provided along the axis on the upper end surface of the lifting disk 14, the plurality of fixed blocks 21 are respectively provided with middle grooves 22, and the plurality of fixed blocks 21 and the plurality of folding plates 18 are respectively staggered.

[0039] Working principle: when it is necessary to fix the fixing rod 6 inward, first rotate the lifting plate 14, then the lower middle groove 22 and the transverse rod 16 are in a parallel state, and then the transverse rod 16 is stuck in the middle groove 22 under the action of the push spring 13, and the follower ball 17 is stuck on the outer wall of the fixed block 21, so as to fix the fixing rod 6, ensuring the fit between the fixing rod 6 and the fixing groove 8. Since only the rigid connection will be affected by the vibration, the connection through the push spring 13 will not be affected by the vibration. Therefore, the transverse rod 16 and the middle groove 22 can always be in a fixed state, and when in a fixed state, the upper and lower fixing grooves 8 also exert a very large pressure on the fixing rod 6, thereby ensuring that there is a considerable friction between the fixing rod 6 and the fixing groove 8, thereby ensuring the stability of the fixation.

[0040] When it is necessary to pre-fix in an unfastened state, it is only necessary to rotate the inclined slot 19 to a position parallel to the transverse rod 16 and then push upward. Since the follower ball 17 is slidably connected to the outer wall of the folding plate 18, it will be pulled outward and then the connection between the fixing rod 6 and the fixing slot 8 will be unfastened. At this time, the unfastening slot 9 and the fixing ring 7 are in a parallel state, the fixing rod 6 and the unfastening ring 10 are in a parallel state, and the bottom plate 2 and the top plate 3 are respectively pressed on the parallel plates 15, thereby ensuring the parallel limit of the fixing rod 6. At this time, the bottom plate 2 and the top plate 3 are in a rotatable connection, so they can be easily unfastened by external force, thereby satisfying the convenience of pre-fixation and disassembly.

[0041] See also Figures 4 to 6In order to achieve the synchronization of the extension and retraction of the top disk 3 and the bottom disk 2, a synchronization mechanism is added, which includes a fitting ring 23 and an embedded ring 24. The top disk 3 and the bottom disk 2 are respectively coaxially installed with the embedded ring 24, and a fitting ring 23 is rotatably installed in each inner ring 24. A plurality of tension springs 25 are arranged between the two fitting rings 23. The top disk 3 and the bottom disk 2 are respectively coaxially opened with synchronization grooves 26, and synchronization sleeves 27 are slidably arranged in the two synchronization grooves 26. The two fitting rings 23 are fitted on the inner wall of the synchronization sleeve 27, and the fitting ring 23 and the synchronization sleeve 27 are coaxially arranged.

[0042] Working principle: When the fixing condition of the bottom plate 2 and the top plate 3 needs to be changed, the top plate 3 and the bottom plate 2 need to be loosened to carry out the conversion process. The coaxiality of the top plate 3 and the bottom plate 2 can be ensured by the synchronous sleeve 27. The embedded ring 24 is respectively connected to the fitting ring 23 in rotation, and the return force of the two is ensured under the action of the tension spring 25. Therefore, the concentricity and fitting effect of the top plate 3 and the bottom plate 2 can be effectively guaranteed.

[0043] In all the schemes mentioned above, the connection between two parts can be selected according to actual conditions by welding, bolt and nut matching connection, bolt or screw connection or other well-known connection methods, which will not be described one by one here. In the above, all fixed connections are preferably welded. Although the embodiments of the present invention have been shown and described, it can be understood by ordinary technicians in this field that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. An anti-loosening locking structure for a bolt fastener, comprising a bolt body (1), characterized in that: The bolt body (1) is threadedly connected to an external device. The bolt body (1) is provided with an adjustment mechanism, which comprises a bottom plate (2), a top plate (3), a one-way plate (4), a pressing sleeve (5), a fixing rod (6), a fixing ring (7), a synchronization mechanism and a telescopic mechanism. The bottom plate (2) and the top plate (3) are respectively provided with one-way plates (4). The one-way plate (4) on the bottom plate (2) is fitted on the external device. The bolt body (1) is provided with a pressing sleeve (5). The one-way plate (4) on the top plate (3) is in contact with the pressing sleeve (5). The top plate (3) and the bottom plate (2) are fitted with each other, and the top plate (3) is provided with a one-way plate (4). (3) and the bottom plate (2) are respectively rotatably connected to the bolt body (1); the bottom plate (2) and the top plate (3) are respectively provided with a plurality of fixing rings (7) along the axis; the plurality of fixing rings (7) are respectively provided with a plurality of fixing grooves (8) at equal intervals; a fixing rod (6) is respectively slidably connected in each of the fixing grooves (8); the synchronization mechanism and the telescopic mechanism are respectively installed on the top plate (3) and the bottom plate (2); the telescopic mechanism comprises a contact ring (12), a push spring (13) and a lifting plate (14); the contact ring (12) is sleeved on the bottom plate (2), and the contact ring (12) is pressed against the external device The push springs (13) are provided in plurality, and the two ends of the push springs (13) are respectively connected to the abutment ring (12) and the lifting plate (14), the lifting plate (14) is slidably connected to the bottom plate (2), the plurality of fixed rods (6) are respectively provided with parallel plates (15), the parallel plates (15) are slidably fitted between the bottom plate (2) and the top plate (3), each of the parallel plates (15) is respectively provided with a transverse rod (16), the transverse rod (16) and the fixed rod (6) are coaxially arranged, each of the transverse rods (16) is respectively provided with a follower ball (17), and the upper end surface of the lifting plate (14) is equidistantly provided with There are a plurality of folding plates (18), each of which is provided with an inclined groove (19), a transverse rod (16) is slidably connected in the inclined groove (19), and a follower ball (17) is slidably connected to the outer wall of the folding plate (18), each of which is provided with a bottom groove (20), the bottom groove (20) and the inclined groove (19) are arranged in parallel, a plurality of fixed blocks (21) are equidistantly arranged along the axis on the upper end surface of the lifting plate (14), a plurality of fixed blocks (21) are provided with intermediate grooves (22), and the plurality of fixed blocks (21) and the plurality of folding plates (18) are arranged in a staggered manner.

2. The anti-loosening locking structure of a bolt fastener according to claim 1, characterized in that: A plurality of unlocking grooves (9) are respectively formed on each of the fixing rods (6), and a plurality of unlocking rings (10) are formed on the bottom plate (2) and the top plate (3), wherein the unlocking grooves (9) and the unlocking rings (10) are arranged in parallel.

3. The anti-loosening and locking structure of a bolt fastener according to claim 2, characterized in that: The plurality of release rings (10) and the plurality of fixing rings (7) are arranged in a staggered manner, and the plurality of fixing grooves (8) and the fixing rods (6) are respectively provided with rounded corners (11).

4. The anti-loosening and locking structure of a bolt fastener according to claim 1, characterized in that: The synchronization mechanism comprises a fitting ring (23) and an inner ring (24), wherein the inner ring (24) is coaxially mounted on the top plate (3) and the bottom plate (2), and a fitting ring (23) is rotatably mounted in each of the inner rings (24), and a plurality of tension springs (25) are arranged between the two fitting rings (23).

5. The anti-loosening locking structure of a bolt fastener according to claim 4, characterized in that: The top plate (3) and the bottom plate (2) are coaxially provided with synchronization grooves (26), and synchronization sleeves (27) are slidably provided in the two synchronization grooves (26).

6. The anti-loosening and locking structure of a bolt fastener according to claim 5, characterized in that: The two fitting rings (23) fit on the inner wall of the synchronous sleeve (27), and the fitting rings (23) and the synchronous sleeve (27) are coaxially arranged.

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