Mobile coupling mechanism for external mechanical position indicator

Abstract

The patent application relates to a mobile coupling mechanism of an external mechanical position indicator for use in a load tap changer or OLTC (on-load tap changer). A movable self-aligning coupling mechanism for actuating a mechanical position indicator eliminates the need for an operator to detach the mechanism for adjustment or maintenance, and performs self-adjustment between the actuating gears to absorb small assembly deviations.

Description

(19) State Intellectual Property Office (12) Invention Patent Application (10) Application Publication Number (43) Application Publication Date (21) Application Number 202480068841.8 (22) Application Date 2024.07.31 (30) Priority Data BR1020230179649 2023.09.04 BR (85) PCT International Application Entering National Phase Date 2026.04.27 (86) PCT International Application Application Data PCT / BR2024 / 050336 2024.07.31 (87) PCT International Application Publication Data WO2025 / 050189 PT 2025.03.13 (71) Applicant America Transformer & Energy Services Company Address Brazil (72) Inventors José Roberto Medeiros Cassio Roberto Alves de Jesus (74) Patent Agency Beijing Linda Liu Intellectual Property Agency (General Partnership) 11277 Patent Attorneys Zhang Huihua Yue Hongjie (51) Int.Cl. H01H 9 / 00 (2006.01) H01F 29 / 04 (2006.01) (54) Invention Title Movable Connection Mechanism for External Mechanical Position Indicator (57) Abstract This patent application relates to a movable connection mechanism for an external mechanical position indicator used in a load tap changer or OLTC (on-load tap changer). The movable self-aligning connection mechanism for actuating mechanical position indicators eliminates the need for the operator to disassemble the mechanism for adjustment or maintenance, and performs self-adjustment between the actuating gears to absorb small assembly deviations. Claims 1 page, Description 6 pages, Drawings 20 pages, CN 122181023 A 2026.06.09 CN 1 22 18 10 23 A 1. A movable coupling mechanism (360) for use in a switch as a mechanical external position indicator, comprising: · kit (130); · kit (140); · kit (150); · kit (190); · gear (150.1); · pin / roller (150.12); · slot (140.1 a-r); · Maltese wheel (140.1); · coil spring system (110.36 a-b); and · articles (190.6) and (140.2). 2. The mechanism according to claim 1, wherein the Maltese wheel (140.1) of the kit (140) is driven as the gear (150.1) rotates and the pin / roller (150.12) contacts the slot (140.1 a-r). 3. The mechanism according to claim 2, wherein the kit (130) and the kit (140) have coupled shafts such that a drive cycle is obtained when the gear (150) rotates one revolution.4. The mechanism according to claim 1, using a helical spring system to support the kit (190), thereby achieving a self-adjusting connection for movement between the article (190.6) and the article (140.2). Claims 1 / 1 page 2 CN 122181023 A Movable Connection Mechanism for Mechanical External Position Indicator Technical Field

[0001] This patent application relates to a movable connection mechanism for a mechanical external position indicator used in an on-load tap changer, which is directly driven by gears for changing the tap position of electrical windings without disconnecting them. Background Art

[0002] An on-load tap changer (OLTC) is a device that changes the turns ratio of a transformer or autotransformer winding by adjusting the operating voltage. It is designed to change the tap position and change the transformation ratio of the transformer or autotransformer when the transformer or autotransformer is energized and under load, thereby performing this function without interrupting the power supply.

[0003] A mechanical position indicator is the most direct way to externally indicate the tap position (TAP) of the switch. In the prior art, the indicator consists of an indicator clock mounted outside the transformer, which has a pointer and markings indicating the current position of the switch. The indicator is connected to a system consisting of flexible cables and gears or chains directly connected to the OLTC, facilitating the transmission of OLTC movement to the position indicator. If it is necessary to synchronize the position (TAP) shown by the position indicator with the OLTC, partial disassembly of the drive system would be necessary, thereby separating the OLTC and the indicator device. The proposed solution, in addition to facilitating self-adjustment between the drive gears to absorb small assembly deviations, also allows for position synchronization between the devices without disassembly. Brief Description of the Drawings

[0004] Figure 1A is a front view of the assembled switch, focusing on the visualization of the moving coupling mechanism.

[0005] Figure 1B is an enlarged view of detail A of Figure 1A.

[0006] Figure 2 is an exploded view of the final assembly level of the switch (100), showing all its kits and individual parts.

[0007] Figure 3 is a perspective view of the fully assembled kit (110).

[0008] Figure 4 is an exploded view of the component hierarchy (110), showing all its kits and individual parts.

[0009] Figure 5 is a perspective view of the gear (150).

[0010] Figure 6 is an exploded view of all the parts of the gear (150).

[0011] Figure 7 is a perspective view of the gear (160).

[0012] Figure 8 is an exploded view of all the parts of the gear (160).

[0013] Figure 9 is a perspective view of the kit (170).

[0014] Figure 10 is an exploded view of the engine kit (170), showing all its individual parts.

[0015] Figure 11 is a perspective view of the top of the assembled voltage divider (180).

[0016] Figure 12 is a perspective view of the bottom of the assembled voltage divider (180).

[0017] Figure 13 is a perspective view of the fully assembled kit (190).

[0018] Figure 14 is an exploded view of the kit (190) showing all its individual parts.

[0019] Figure 15 is a perspective view of the fully assembled terminal strip (200).

[0020] Figure 16 is an exploded view of the terminal strip (200) showing all its individual parts.

[0021] Figure 17A is an exploded view of the movable kit (130), focusing on the front, showing all its kits and individual parts.

[0022] Figure 18B is an exploded view of the movable kit (130), focusing on the rear, showing all its kits and individual parts.

[0023] Figure 19 is an exploded view of the kit (280), showing all its kits and individual parts.

[0024] Figure 19 is an exploded view of brush (300), showing all its individual parts.

[0025] Figure 20 is an exploded view of brush (310), showing all its individual parts.

[0026] Figure 21 is an exploded view of kit (290), showing all its kit parts and individual parts.

[0027] Figure 22 is an exploded view of brush (320), showing all its individual parts.

[0028] Figure 23 is an exploded view of brush (330), showing all its individual parts.

[0029] Figure 24A is a perspective view of the front of kit (140).

[0030] Figure 24B is a perspective view of the rear of kit (140).

[0031] Figure 25A is an exploded view of drive kit (140), focusing on the rear, showing all its kit parts and individual parts.

[0032] Figure 25B is an exploded view of the drive assembly (140), focusing on the front and showing all its components and individual parts.

[0033] Figure 26A is a perspective view of the bottom of the rotor (340).

[0034] Figure 26B is a perspective view of the top of the rotor (340).

[0035] Figure 27 is a front view of the mechanical indicator (350).Detailed Description

[0036] The present invention relates to a movable coupling mechanism (360) for a mechanical external position indicator used in a tap changer (100), comprising:

[0037] · kit (130);

[0038] · kit (140);

[0039] · kit (150);

[0040] · kit (190);

[0041] · gear (150.1);

[0042] · pin / roller (150.12);

[0043] · slot (140.a-r);

[0044] · Maltese wheel (140.1);

[0045] · coil spring system (110.36a-b); and

[0046] · articles (190.6) and (140.2).

[0047] Referring to Figures 1A and 1B, a switch (100) including a base kit (110), a moving kit (130), and a drive kit (140) can be observed.

[0048] Referring to FIG2, the switch (100) includes a hole (100.3) of an article (100.4 a-c) received in a hole (100.9) of the kit (110); a shaft (100.6) of the kit (130) is received in a hole (100.7) of the kit (110); a key (100.10) is received in a thread (100.11) of the shaft (100.6); a hole (100.13) of the hub (100.12) is received in the shaft (100.6) of the kit (130); a stud (100.14) is fastened to a hole (100.15) of the hub (100.12); and a hole (100.16) of the kit (140) is connected to a hole (100.17) of the hub (100.12). a-c) concentric; fastening elements and kits (140) fasten to the holes (100.17 a-c) of the hub (100.12); the holes (100.22) of the article (100.21) are received in the rod (100.20) of the article (100.18).Instruction manual, pages 2 / 6, CN 122181023 A

[0049] Referring to Figures 3 and 4, the article (110.1) is the base for fastening the kit and the entire article; the diameter (110.3) of the sleeve (110.2) is received in the hole (110.4) of the article (110.1); the resilient pins (110.5 a-b) are fastened to the hole in the Sf (front surface) of the article (110.1); the hole (110.7) of the article (110.6) is fastened to the hole in the front surface of the article (110.1); the hole (110.11) of the article (110.9) and the spacer (110.10) are received in the threaded shaft (110.8), which is then fastened to the front surface of the article (110.1); the torsion spring (110.13) a-b) and leaf spring (110.14 a-b) are housed in threaded shaft (110.12 a-b), which is then fastened to the front surface of article (110.1); micro-key (110.15 a-b), spacer (110.16) and fastening element are fastened to holes in the front surface of article (110.1); micro-key (110.17 d), spacer (110.16) and fastening element are fastened to holes in the front surface of article (110.1); micro-key (110.17a-c), spacer (110.18 a-f) and fastening element are fastened to holes in the front surface of article (110.1); micro-key (110.19 a-c), spacer (110.16) and fastening element are fastened to the front surface of article (110.1). .1) A hole in the front surface of the article (110.1); the shaft 110.21 and the fastening element are fastened to the hole in the front surface of the article (110.1); the article (110.23) is received in the diameter (110.22) of the shaft (110.21); the kit (150) is received in the diameter (110.22) of the shaft (110.21); the spring ring (110.25) is received in the channel (110.24) of the shaft (110.21); the shaft (110.26) and the fastening element are fastened to the hole in the front surface of the article (110.1); the kit (160) is received in the diameter (110.27) of the shaft (110.26); the spring ring (110.29) is received in the shaft (110.26). In the channel (110.28); the kit (170) and fastening element are fastened to the hole in the sp (rear surface) of the article (110.1); the resistor (110.31) and fastening element are fastened to the hole in the front surface of the article (110.1); the kit (180), the article (110.33) and fastening element are fastened to the hole in the front surface of the article (110.1); the shaft (110.35 a-b) is received in the hole (110.34 a-b) of the kit (190).Springs (110.36 a-b) are housed in shafts (110.35 a-b), and fastening elements are fastened to holes in the front surface of article (110.1); articles (110.37), articles (110.38), and fastening elements are fastened to holes in the front surface of article (110.1); articles (110.39) and fastening elements are fastened to holes in the front surface of article (110.1).

[0050] Referring to Figures 5 and 6, gear (150.1) is a base for assembling other components forming the kit (150). The diameter (150.5 a-b) of the sleeve (150.4 a-b) is accommodated in the hole (150.2) of the gear (150.1); the diameter (150.9) of the pin (150.8) is accommodated in the hole (150.7) of the roller (150.6); the diameter (150.9) of the pin (150.8) is accommodated in the hole (150.3) of the gear (150.1); and the spring ring (150.11) is accommodated in the thread (150.10) of the pin (150.8).

[0051] Referring to Figures 7 and 8, the gear (160.1) is a base for assembling other components forming the kit (160). The diameter (160.4 a-b) of the sleeve (160.3 a-b) is accommodated in the hole (160.2) of the gear (160.1).

[0052] Referring to Figures 9 and 10, the engine (170.1) is a base for assembling other components forming the kit (170). The diameter (170.3) of the spacer (170.4) is accommodated in the shaft (170.2) of the engine (170.1); the key (170.5) is accommodated in the thread (170.6) of the shaft (170.2) of the engine (170.1); the hole (170.8) of the gear (170.7) is accommodated in the shaft (170.2) of the engine (170.1); the hole (170.10) of the item (170.9) is accommodated in the shaft (170.2) of the engine (170.1); the item (170.11) coincides with and is concentric with the item (170.9); the hole (170.12) of the item (170.11) and the hole (170.13) of the shaft (170.2) of the engine (170.1) are concentric. Fastening elements and articles (170.11) are fastened to the holes (170.13) of the shaft (170.2) of the engine (170.1).

[0053] Referring to Figures 13 and 14, the bearing (190.1) is a base for mounting other components of the forming kit (190).The diameter (190.4 a-b) of the sleeve (190.3 a-b) is accommodated in the hole (190.2) of the bearing (190.1); the diameter (190.7) of the pinion (190.6) is accommodated in the hole (190.5 a-b) of the sleeve (190.3 a-b); and the spring ring (190.9) is accommodated in the thread (190.8) of the pinion (190.6).

[0054] Referring to Figures 15 and 16, the strip (200.1) is the basis for assembling the other components forming the kit; the holes (200.2 a-b) of the article (200.1), the holes (200.4 a-b) of the plate (200.3), the holes (200.6 a-b) of the terminal (200.5 a-b), and the holes (200.8 a-b) of the terminal (200.7 a-b) are concentric; the terminals (200.7 a-b), the terminals (200.5 a-b), and the plate (200.3) are riveted in the holes (200.2 a-b) of the article (200.1) with rivets (200.9 a-b); the holes (200.2 a-b) of the article (200.1) are... The holes (200.6 c-m) of the c-m and the terminal (200.5 c-m) are concentric; the terminal (200.6 c-m) is riveted in the hole (200.2 c-m) of the article (200.1) with a rivet (200.9 c-m).

[0055] Referring to Figures 17A and 17B, the article (130.1) is the basis for assembling other parts forming the kit (130). The shaft (130.4) of the article (130.3) is received in the hole (130.2) of the article (130.1). Holes (130.7) of item (130.4), (130.8) of item (130.5), (130.9) of item (130.6), (130.10) of item (130.1), and (130.12) of item (130.11) are concentric. The fixing element, along with items (130.3), (130.5), (130.6), and (130.11), is fastened to hole (130.10) of item (130.1). Holes (130.13) of shaft (130.13) and (130.15) of item (130.6) are concentric. The fixing element and shaft (130.13) are fastened to hole (130.15) of item (130.6). The diameter (130.17) of item (130.1) is contained within the diameter (130.18) of item (130.1). The hole (130.20) of ring (130.19) and the hole (130.21) of item (130.1) are concentric.The fastening element and ring (130.19) are fastened to the hole (130.21) of the article (130.1). The holes (130.23) of the roller (130.22), (130.25) of the spacer (130.24), and (130.26) of the article (130.1) are concentric. The fastening element, roller (130.22), and spacer (130.24) are fastened to the hole (130.26) of the article (130.1). The holes (130.27) of the kit (280) and (130.28) of the article (130.5) are concentric. The fastening element and kit (280) are fastened to the hole (130.28) of the article (130.5). Hole (130.29) of kit (280) and hole (130.30) of item (130.1) are concentric. Fastening element and kit (280) are fastened to hole (130.30) of item (130.1). Hole (130.31) of kit (290) and hole (130.32) of item (130.19) are concentric. Fastening element and kit (290) are fastened to hole (130.32) of item (130.19). Hole (130.33) of kit (290) and hole (130.34) of item (130.1) are concentric. Fastening element and kit (290) are fastened to hole (130.34) of item (130.1).

[0056] Referring to FIG18, the article (280.1) is the basis for assembling other components forming the kit (280). The holes (280.2) of the article (280.1), the hole (280.4a) of the article (280.3a), the hole (280.5a) of the kit (310), the hole (280.7a) of the article (280.6a), the hole (280.9a) of the article (280.8a), the hole (280.4b) of the article (280.3b), the hole (280.5b) of the kit (300), the hole (280.7b) of the article (280.6b), and the hole (280.9b) of the article (280.8b) are concentric. Fastening elements, articles (280.3 a-b), articles (280.6 a-b), articles (280.8 a-b), kit (300), and kit (310) are fastened to holes (280.2) in article (280.1).

[0057] Referring to FIG19, article (300.1) is the basis for assembling other components forming kit (300). Holes (300.4) in article (300.3), holes (300.6) in article (300.5), and holes (300.7) in article (300.6) are received in pins (300.2) in article (300.1). Pins (300.2) are riveted.

[0058] Referring to FIG20, article (310.1) is the basis for assembling other components forming kit (310).Holes (310.4) of article (310.3), (310.6) of article (310.5), and (310.8) of article (310.7) are accommodated in pins (310.2) of article (310.1). Pins (310.2) are riveted.

[0059] Referring to FIG21, article (290.1) is the basis for assembling other components forming kit (290). Holes (290.2) of item (290.1), (290.4 a) of item (290.3 a), (290.5 a) of kit (330), (290.7 a) of item (290.6 a), (290.9 a) of item (290.8 a), (290.4 b) of item (290.3 b), (290.5 b) of kit (320), (290.7 b) of item (290.6 b), and (290.9 b) of item (290.8 b) are concentric. Fastening elements, items (290.3 a-b), items (290.6 a-b), items (290.8 a-b), kit (320), and kit (330) are fastened to hole (290.2) of item (290.1).

[0060] Referring to FIG. 22, the article (320.1) is the basis for assembling other components forming the kit (320). Holes (320.4) of article (320.3), (320.6) of article (320.5), and (320.7) of article (320.6) are accommodated in pins (320.2) of article (320.1). The pins (320.2) are riveted.

[0061] Referring to FIG. 23, the article (330.1) is the basis for assembling other components forming the kit (330). Holes (330.4) of article (330.3), (330.6) of article (330.5), and (330.8) of article (330.7) are accommodated in pins (330.2) of article (330.1). Pins (330.2) are riveted.

[0062] Referring to Figures 24A, 24B, 25A, and 25B, article (140.1) is the basis for assembling other components forming the kit (140). Holes (140.4 a-d) of article (140.1) and holes (140.5 a-d) of article (140.2) are concentric. Fastening elements and article (140.2) are fastened to holes (140.4 a-d) of article (140.1o). Holes (140.7 a-b) and (140.6 a-b) of the kit (340) are concentric. The fastening element and the kit (340) are fastened to the hole (140.6 a-b) of the item (140.1).The holes (140.9 a-b) of article (140.3) and the holes (140.8 a-b) of article (140.1) are concentric. The fixing element and article (140.3) are fastened to the holes (140.8 a-b) of article (140.1).

[0063] Upon detecting a voltage change in the line, the control device sends the necessary signal to the switch (100) to change the tap in order to regulate the line voltage. The switching direction can be upward or downward and is defined by the direction of rotation of the engine (170) commanded by the control device. The shaft (170.6) of the engine (170) is coupled to a gear (170.8) that moves a rotary amplifier system consisting of gears (160) and (150). The gear (150) has a pin / roller (150.12) in its body, which serves as a drive for the Maltese wheel (140.1).

[0064] The Maltese wheel (140.1) of the kit (140) is driven as the gear (150) rotates, and when the pin / roller (150.12) stops contacting the slot (140.1a-r) of the Maltese wheel (140.1), the pin / roller (150.12) contacts the slot (140.1a-r), and the article (150.13) of the gear (150) supports the Maltese wheel (140.1) in the slot (140.2a-r) of the Maltese wheel (140.1). One drive cycle is obtained with each complete rotation of the gear (150).

[0065] The Maltese wheel (140.1) of the kit (140) serves to couple the movement of the engine transmission (170) with the movement of the kit (130). Kits (140) and kit (130) have a coupled shaft such that a given rotation angle of kit (130) is obtained when a full rotation of gear (150) occurs. This rotation angle causes the brushes of movable contacts (280) and movable contacts (290) to move and alternate between the fastened contacts, thereby achieving different position combinations. Thus, the tap changes according to the voltage change readings executed online by the control device.

[0066] During the transition movement of the tap, there is movement of gear (140.2) of kit (140). Pinion (190.6) meshes with gear (140.2). Bearing (190.1) supports the shaft (190.7) of pinion (190.6). In this way, the kit (190) can transmit the movement of the internal mechanism of the switch (100) to an external position indicator via the pointer (350.2) of the movement indicator (350), as can be seen in Figure 37, where the term "INST" refers to the instantaneous indication of position. According to Figure 36b, the helical spring (110.36a-b) serves to hold the kit (190) and the kit (140) connected.This connection occurs by means of continuous contact generated by springs (110.36 a-b) between gears (360.1) and (140.2).

[0067] The use of helical springs (110.36 a-b) allows for manual connection and disconnection of kits (190) and (140), thus allowing adjustment without disassembly. It also provides absorption of small deviations in the assembly and dimensional of the parts, facilitating self-adjustment between the gears. Synchronization between the position indicator and the current position of the switch (100) is necessary for the operator to perform maneuvers, remove and put the transformer into operation, and verify the correct operation of the transformer and its control devices during inspections, as it provides the operator with a sense of security regarding the location of the OLTC in conjunction with other indicators. In the prior art, the connection mechanism is designed such that it is necessary to partially disassemble the system to synchronize the OLTC and the indicator. The helical spring (110.36 a-b) allows the maintainer to manually apply force to the kit (190) to disengage items (360.1) and (140.2) by rotating the axis of the kit (190) so that the pointer indication (350.2) is synchronized with the current tap of the switch instruction manual page 5 / 6 7 CN 122181023 A (100), and items (360.1) and (140.2) are re-engaged with a properly synchronized mechanism.

[0068] To provide redundancy for operator confirmation of the current position (tap), the OLTC is equipped with a resistance sensor and a position sensor, the resistance sensor providing an electrical signal to the control unit that allows identification of the current position, the position sensor consisting of a voltage divider (180) and a rotor (340). The rotor (340) is coupled to the Maltese wheel (140.1) such that, during the drive cycle, the pin (340.2b) moves and alternates between contacts (180.2a-q). Simultaneously, the pin (340.2a) always travels in contact with the conductive track (180.3). Each combination of the pin (340.2b) with the corresponding contact (180.2a-q) results in a different resistance level, thereby allowing the control device to identify the current position of the OLTC and display it to the operator.

[0069] Therefore, those skilled in the art prior to the switch (100) of the present invention will understand that the advantages over the prior art are:

[0070] - Self-adjustment between the drive gears, absorbing small assembly deviations.

[0071] - The possibility of synchronizing the position of the switch with an external position indicator without requiring complete or partial disassembly of the mechanism.

[0072] Conclusion

[0073] It can be inferred from the above description that the switch (100) of the present invention is superior to the solution of the prior art and has the advantages of the prior art switch. It is very susceptible to industrial applicability because it has a new configuration. It is inventive and leads to functional improvement in its use. Instruction manual page 6 / 6 8 CN 122181023 A Figure 1A Instruction manual figure 1 / 20 page 9 CN 122181023 A Figure 1B Instruction manual figure 2 / 20 page 10 CN 122181023 A Figure 2 Instruction manual figure 3 / 20 page 11 CN 122181023 A Figure 3 Instruction manual figure 4 / 20 page 12 CN 122181023 A Figure 4 Instruction manual figure 5 / 20 page 13 CN 122181023 A Figure 5 Figure 6 Instruction manual figure 6 / 20 page 14 CN 122181023 A Figure 7 Figure 8 Instruction manual figure 7 / 20 page 15 CN 122181023 A Figure 9 Figure 10 Instruction manual figure 8 / 20 page 16 CN 122181023 A Figure 11 Instruction manual figure 9 / 20 page 17 CN 122181023 A Figure 12 Figure 13 Appendix to the Instruction Manual, Page 10 / 20, 18 CN 122181023 A Figure 14 Figure 15 Appendix to the Instruction Manual, Page 11 / 20, 19 CN 122181023 A Figure 16 Figure 17A Appendix to the Instruction Manual, Page 12 / 20, 20 CN 122181023 A Figure 17B Appendix to the Instruction Manual, Page 13 / 20, 21 CN 122181023 A Figure 18 Figure 19 Appendix to the Instruction Manual, Page 14 / 20, 22 CN 122181023 A Figure 20 Figure 21 Appendix to the Instruction Manual, Page 15 / 20, 23 CN 122181023 A Figure 22 Figure 23 Appendix to the Instruction Manual, Page 16 / 20, 24 CN 122181023 A Figure 24A Figure 24B Appendix to the Instruction Manual, Page 17 / 20, 25 CN 122181023 A Figure 25A Figure 25B Figure 18 / 20, page 26, CN 122181023 A, Figure 26A, Figure 26B; Figure 19 / 20, page 27, CN 122181023 A, Figure 27; Figure 20 / 20, page 28, CN 122181023 A.

Claims

1. A movable coupling mechanism (360) used in a switch for a mechanical external position indicator, comprising: • Kit (130); • Kit (140); • Kit (150); • Kit (190); Gear (150.1) • Pin / roller (150.12); • Slot (140.1 ar); Maltese Wheel (140.1); • Helical spring system (110.36 ab); and • Items (190.6) and (140.2).

2. The mechanism according to claim 1, wherein, As the gear (150.1) rotates and the pin / roller (150.12) contacts the slot (140.1ar), the Maltese wheel (140.1) of the kit (140) is driven.

3. The mechanism according to claim 2, wherein, The kit (130) and kit (140) have a connected shaft, which allows for a drive cycle when the gear (150) rotates once.

4. The mechanism according to claim 1, using a helical spring system to support the kit (190), thereby achieving a self-adjusting connection for movement between the article (190.6) and the article (140.2).

Images