An electrical connector that is not easy to break

Abstract

The present invention belongs to the technical field of connection devices and discloses an electrical connector that is not easy to break, including a fixing plate, a terminal head fixedly connected to one side of the fixing plate, a mounting seat fixedly connected to the side wall of the mounting seat, a rubber ring clamped at the end of the shell, and a plastic plate slidably abutted against the inner cavity of the shell. By arranging the cooperation of structures such as the slide groove turning rod and the frame rod, it is facilitated to achieve a certain degree of compensation effect between the pin and the wire during the plugging and unplugging of the connector. During the plugging and unplugging of the connector, the pin is subjected to axial stress of extrusion force and tension, and can achieve a certain degree of compensation effect through the elastic squeezing of the ball and the rubber pad. At the same time, the wire connected to the end of the pin is also pulled and moved slightly. At this time, the frame rod can be rotated in reverse to flatten the wire, so that the reserved bending section of the wire can be used as tensile displacement compensation, thereby avoiding the situation where the wire is stretched and broken after multiple plugging and unplugging.

Description

Technical Field

[0001] The invention belongs to the technical field of connection devices, and in particular to an electric connector that is not easily broken. Background Art

[0002] An electrical connector is a precision electromechanical component used to connect, disconnect or convert circuits. Its core function is to establish a reliable electrical signal and power transmission channel between two or more circuit nodes, while providing mechanical fixation and environmental protection. It mainly conducts current or signals through the physical contact of metal contacts such as pins. The fracture failure of electrical connectors is the result of the coupling of multiple factors such as mechanical stress, material defects, environmental corrosion and design deficiencies, which profoundly affects the reliability and safety of the equipment.

[0003] The prior art document publication number is CN107768906B, which includes an electrical connector comprising a shell formed of a plastic material and at least one terminal module arranged in the shell, the shell being provided with a base and a docking portion extending from the base in a front-to-rear direction, the docking portion being provided with a docking surface in an up-and-down direction, the terminal module comprising a conductive terminal having a contact portion and an insulating block, the contact portion of the conductive terminal being exposed to the docking surface, the electrical connector also comprising two metal reinforcements respectively assembled on the outer surfaces of the terminal module, the shell covering the terminal module and the metal reinforcement, the presence of the metal reinforcement in the electrical connector enhancing the overall strength of the electrical connector, reducing the influence of shear stress on the electrical connector and making it less susceptible to direct force fracture.

[0004] Although the above-mentioned device adds a metal reinforcement to the electrical connector to improve its fracture resistance, it is easy to generate axial stress of tension or compression on the pins during the plugging and unplugging process of the existing connector, and the connector may vibrate during use. The pins are usually fixed to the insulating parts and lack a stress compensation structure, so they are easily bent or broken by vibration, which is not conducive to the long-term use of the electrical connector. Summary of the Invention

[0005] In order to solve the problems raised in the above background technology that the pins are easily subjected to tensile or extrusive axial stress during the plugging and unplugging of the connector, and the connector is easily bent or broken due to vibration during use, the present invention provides an electrical connector that is not easy to break.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: an electrical connector that is not easy to break, comprising a fixing plate, a terminal head fixedly connected to one side of the fixing plate, a mounting seat fixedly connected to the other side of the fixing plate, a shell fixedly connected to the side wall of the mounting seat, a rubber ring clamped to the end of the shell, a plastic plate slidably abutted against the inner cavity of the shell, and pins equidistantly inserted into the plastic plate, and further comprising: a positioning and anti-slipping mechanism connected to the shell; a compensating and anti-breaking mechanism connected to the positioning and anti-slipping mechanism;

[0007] The positioning and anti-slipping mechanism extends and positions the plastic plate, and the compensating and anti-breaking mechanism assists the positioning and anti-slipping mechanism in bending and laying the wires to reserve space for stretching.

[0008] Preferably, the positioning and anti-slip mechanism includes a stress relief sleeve fixed to the side wall of the plastic plate by bolts, a plurality of anti-slip rings are fixed to the outer wall of the stress relief sleeve, and at least a pair of guide ridges are fixed at equal distances to the inner surface of the outer shell, and the stress relief sleeve and the plastic plate are slidably connected to the guide ridges through grooves.

[0009] Preferably, the stress relief sleeve is slidably connected to a first hub and a second hub on both sides, and wires are fixedly passed through the first hub and the second hub, and the wires are transformed from a divergent state on both sides to a centrally gathered state after passing through the first hub and the second hub.

[0010] Preferably, a plurality of dome telescopic columns are equidistantly and slidingly connected to the upper and lower sides of the stress relief sleeve, the outer walls of the dome telescopic columns are elastically connected to the inner cavity of the stress relief sleeve through a sliding plate, and the upper and lower sides of the stress relief sleeve are threadedly connected to the mounting seat through positioning bolts.

[0011] Preferably, the compensation and anti-breakage mechanism includes a pair of bases fixed in the stress relief sleeve, the tops of the bases are rotatably connected to slide rods, the ends of the slide rods are rotatably connected to push plates, and the side walls of the push plates are vertically slidably connected to the side walls of the second hub.

[0012] Preferably, the middle chutes of a pair of chutes rotating rods are both slidably connected to a U-shaped plate via a connecting shaft, and the pair of U-shaped plates are commonly fixed to a lifting plate.

[0013] Preferably, a threaded rod is threadedly connected to the middle portion of the lifting plate, and the threaded rod is rotatably connected to the stress relief sleeve through a rotating sleeve.

[0014] Preferably, the end of the electric wire passing through the second hub is fixedly connected to the pin, a ball is fixedly connected to the root of the pin, and hook grooves are provided on both side edges of the plastic plate.

[0015] Preferably, a frame rod is passed through the outer wall of the wire, and the frame rod is divided into an upper and a lower part. The upper and lower parts of the frame rod are connected by a rectangular plug-in block, and the plug-in pin is connected to the end of the wire.

[0016] Preferably, a rubber pad is sleeved on the outer wall of the pin, and the rubber pad is fixedly connected to the plastic plate. The rubber pad is divided into two parts and abuts against the outer wall of the ball from both sides.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The present invention facilitates the compensation effect of the pins and wires to a certain extent during the plugging and unplugging of the connector by arranging the cooperation of the slide rod and the frame rod. During the plugging and unplugging of the connector, the pins are subjected to axial stress of extrusion and tension, which can achieve a certain degree of compensation effect through the elastic squeezing of the ball and the rubber pad. At the same time, the wire connected to the end of the pin is also pulled and moved slightly. At this time, the frame rod can be rotated in the opposite direction to flatten the wire, so that the bent section reserved for the wire can be used as tensile displacement compensation to avoid the wire being stretched and broken after multiple plugging and unplugging.

[0019] (2) The present invention facilitates the prevention of pin breakage during vibration by providing a combination of structures such as a rubber pad, a ball and an anti-slip ring. When the connector vibrates, the anti-slip ring provided on the outside of the stress relief sleeve increases the friction between the stress relief sleeve and the inner surface of the housing. In addition, the provision of the rubber pad not only allows for adaptive compensation during installation, but also reduces the transmission of vibration to the pin, thereby effectively improving the assembly integration effect of the connector. In combination with the ball provided on the pin, the anti-vibration ability of the pin root can also be enhanced.

[0020] (3) The present invention facilitates the stable installation and positioning of the pin by arranging the coordination of the stress relief sleeve and the dome telescopic column and other structures. The stress relief sleeve and the plastic plate are slid into the housing as a whole through the guide ribs. The guide ribs can ensure the lateral positioning of the stress relief sleeve. During the movement, the dome telescopic column remains in a compressed state and pops out of the slot position inside the mounting seat to perform longitudinal positioning of the stress relief sleeve. Since a plurality of dome telescopic columns are arranged at equal intervals, the shear stress received can be evenly dispersed to the mounting seat during the use of the connector. The stress relief sleeve can increase the relative installation area of ​​the plastic plate and disperse the stress. The mounting seat and the stress relief sleeve are connected by bolts from both sides with the positioning bolts, thereby further enhancing the stability of the installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the front view structure of the present invention;

[0023] Figure 3 This is a side structural diagram of the present invention;

[0024] Figure 4 Schematic diagram of the structural coordination relationship between the plastic plate and the stress relief sleeve of the present invention;

[0025] Figure 5 Schematic diagram of the structural coordination relationship between the dome telescopic column and the stress relief sleeve of the present invention;

[0026] Figure 6 A schematic diagram of the structural coordination relationship between the push plate and the second hub of the present invention;

[0027] Figure 7 For the present invention Figure 6 A schematic diagram of the partially enlarged structure at center A;

[0028] Figure 8 Schematic diagram of the structural coordination relationship between the anti-slip ring and the stress relief sleeve of the present invention;

[0029] Figure 9 For the present invention Figure 8 A schematic diagram of the partially enlarged structure at point B in the middle;

[0030] Figure 10 This is a schematic diagram of the structural coordination relationship between the frame rod and the rectangular insert of the present invention;

[0031] Figure 11 This is a schematic diagram of the structural matching relationship between the ball and the pin of the present invention;

[0032] Figure 12 For the present invention Figure 11 Schematic diagram of the partially enlarged structure at point C in the middle.

[0033] In the picture:

[0034] 1. Fixing plate; 2. Terminal block; 3. Mounting base; 4. Housing; 5. Rubber ring; 6. Positioning and anti-slip mechanism; 61. Guide rib; 62. Positioning bolt; 63. Dome telescopic column; 64. Stress relief sleeve; 65. Anti-slip ring; 66. First hub; 67. Electric wire; 68. Second hub; 7. Compensation and anti-break mechanism; 71. Hook groove; 72. Push plate; 73. Slide turning rod; 74. Rotating sleeve; 75. Threaded rod; 76. Base; 77. U-shaped plate; 78. Lifting plate; 79. Frame rod; 710. Rectangular plug; 711. Ball; 712. Rubber pad; 8. Plastic plate; 9. Pin. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] like Figures 1 to 12 As shown, the present invention provides an electrical connector that is not easy to break, including a fixing plate 1, a terminal 2 is fixedly connected to one side of the fixing plate 1, a mounting seat 3 is fixedly connected to the other side of the fixing plate 1, a housing 4 is fixedly connected to the side wall of the mounting seat 3, a rubber ring 5 is clamped to the end of the housing 4, a plastic plate 8 is slidably abutted against the inner cavity of the housing 4, and pins 9 are equidistantly inserted into the plastic plate 8, and further comprising: a positioning and anti-slip mechanism 6, the positioning and anti-slip mechanism 6 is connected to the housing 4; and a compensating and anti-breaking mechanism 7, the compensating and anti-breaking mechanism 7 is connected to the positioning and anti-slip mechanism 6;

[0037] Among them, the positioning and anti-slipping mechanism 6 extends and positions the plastic plate 8, and the compensating and anti-breaking mechanism 7 assists the positioning and anti-slipping mechanism 6 to bend and lay the wire to reserve stretching space.

[0038] Adopting the above scheme: connecting with the equipment cable through the terminal head 2, the fixing plate 1 can install and position the connector as a whole at the specified position of the equipment, and installing and guiding it with the docking connector through the shell 4, so that the pin 9 is inserted into the connector to complete the docking, and it can be powered on and used. When the connector is in use, it has good vibration resistance and can cope with multiple plugging and unplugging effects.

[0039] like Figure 1 and Figure 2 As shown, the positioning and anti-slip mechanism 6 includes a stress relief sleeve 64 fixed to the side wall of the plastic plate 8 by bolts, a plurality of anti-slip rings 65 are fixed to the outer wall of the stress relief sleeve 64, and at least a pair of guide ridges 61 are fixed to the inner surface of the outer shell 4 at equal distances, and the stress relief sleeve 64 and the plastic plate 8 are slidably connected to the guide ridges 61 through grooves.

[0040] like Figure 4 and Figure 8 As shown, the stress relief sleeve 64 is slidably connected to the first hub 66 and the second hub 68 on both sides respectively, and an electric wire 67 is fixedly passed through the first hub 66 and the second hub 68, and the electric wire 67 changes from a divergent state on both sides to a centered convergent state after passing through the first hub 66 and the second hub 68; a number of dome telescopic columns 63 are equidistantly slidably connected to the upper and lower sides of the stress relief sleeve 64, and the outer wall of the dome telescopic column 63 is elastically connected to the inner cavity of the stress relief sleeve 64 through a sliding plate, and the upper and lower sides of the stress relief sleeve 64 are threadedly connected to the mounting base 3 through positioning bolts 62.

[0041] The above solution is adopted: a slot is provided at the position of the positioning bolt 62 corresponding to the dome telescopic column 63, which is used to clamp the dome telescopic column 63 at the specified position, and cooperate with the positioning bolt 62 to ensure the accurate positioning of the stress relief sleeve 64. A plurality of frame rods 79 are arranged in parallel, and each frame rod 79 can limit a row of wires 67. During installation, the stress relief sleeve 64 and the plastic plate 8 are slid into the housing 4 as a whole through the guide ridge 61, and the end of the stress relief sleeve 64 reaches the inside of the terminal head 2. At this time, the dome telescopic column 63 remains in a compressed state and reaches the internal slot position of the mounting seat 3. The elastic force of the spring lifts the dome telescopic column 63 into the slot for limitation. Since a plurality of dome telescopic columns 63 are arranged at equal distances, the shear stress can be evenly distributed to the mounting seat 3 during the plugging and unplugging or use of the connector.

[0042] like Figure 4 、 Figure 7 and Figure 8 As shown, the compensation and anti-breakage mechanism 7 includes a pair of bases 76 fixedly connected to the stress relief sleeve 64, the tops of the bases 76 are rotatably connected to the slide rods 73, the ends of the slide rods 73 are rotatably connected to the push plates 72, and the side walls of the push plates 72 are vertically slidably connected to the side walls of the second hub 68; the middle slides of the pair of slide rods 73 are slidably connected to the U-shaped plates 77 through the connecting shafts, and the pair of U-shaped plates 77 are commonly fixed to the lifting plates 78; the middle part of the lifting plate 78 is threadedly connected to the threaded rod 75, and the threaded rod 75 is rotatably connected to the stress relief sleeve 64 through the rotating sleeve 74.

[0043] It is worth noting that the side wall of the push plate 72 is vertically slidably connected to the side wall of the second hub 68 by providing a vertical slide groove on the second hub 68, and the push plate 72 is vertically slidably connected on the vertical slide groove on the side wall of the second hub 68, which is not described in detail here.

[0044] like Figures 9 to 12 As shown, the end of the wire 67 passing through the second hub 68 is fixedly connected to the pin 9, a ball 711 is fixed to the root of the pin 9, and hook grooves 71 are provided on the edges of both sides of the plastic plate 8; a frame rod 79 is passed through the outer wall of the wire 67, and the frame rod 79 is divided into an upper and lower part. The upper and lower parts of the frame rod 79 are connected by a rectangular plug block 710, and the pin 9 is connected to the end of the wire 67; a rubber pad 712 is sleeved on the outer wall of the pin 9, and the rubber pad 712 is fixedly connected to the plastic plate 8. The rubber pad 712 is divided into two parts and abuts against the outer wall of the ball 711 from both sides.

[0045] Using the above solution, when pre-setting the bend for the wires 67, the threaded rod 75 is rotated to squeeze the lifting plate 78. This downward movement, through the lifting plate 78, simultaneously drives the U-shaped plates 77 on both sides downward, causing the connecting shaft in the middle of the U-shaped plates 77 to squeeze the chute rotating rod 73. The chute rotating rod 73 squeezes the push plate 72, causing the push plate 72 to push the second hub 68 away from the lifting plate 78. At this time, the wires 67 evenly spaced outside the second hub 68 also move away from the lifting plate 78. Because the wires 67 are threaded through the middle of the frame rod 79, when the length of the wires 67 remains unchanged and the second hub 68 approaches the plastic plate 8, it squeezes the wires 67 and causes the frame rod 79 to rotate slightly, causing the wires 67 to bend. The frame rod 79 abuts the curved portion of the wires 67, preventing them from bending excessively. It also independently limits the position of each row of wires 67, achieving a smoother arrangement and preventing clutter. During the plugging and unplugging process of the connector, the pin 9 is subjected to axial stress of extrusion and tension, and the elastic squeezing of the ball 711 and the rubber pad 712 can achieve a certain degree of compensation effect. At the same time, the wire 67 connected to the end of the pin 9 is also pulled and moved slightly. At this time, the frame rod 79 can rotate in the opposite direction to flatten the wire 67, so that the reserved bending section of the wire 67 can be used as tensile displacement compensation to avoid the wire 67 from being stretched and broken after multiple plugging and unplugging.

[0046] According to the working principle and use process of the present invention:

[0047] First, the staff manually screws the threaded rod 75, and the threaded rod 75 rotates, so that the lifting plate 78 on the outer wall moves downward under the meshing transmission of the threaded hole and the threaded rod 75, and the U-shaped plates 77 on both sides are synchronously driven downward by the lifting plate 78, so that the connecting shaft in the middle of the U-shaped plate 77 squeezes the chute rotating rod 73, Figure 7Observed from a different angle, the chute lever 73 rotates counterclockwise. Because the sidewalls of the push plate 72 are vertically slidably connected to the sidewalls of the second hub 68, the rotation of the chute lever 73 squeezes and pushes the push plate 72, causing it to move the second hub 68 away from the lifting plate 78. At this time, the wires 67, evenly spaced outside the second hub 68, also move away from the lifting plate 78. Since the wires 67 are threaded through the middle of the frame rod 79, when the length of the wires 67 remains constant and the second hub 68 approaches the plastic plate 8, they squeeze the wires 67 and cause the frame rod 79 to rotate slightly, causing the wires 67 to bend moderately. When the wires 67 bend, the frame rod 79 abuts against the bend to limit their position, preventing them from bending excessively. It also independently limits the position of each row of wires 67, achieving a smoother, more organized arrangement and preventing clutter. The ball 711 provided at the root of the pin 9 can increase the anti-fracture ability of the pin 9. In conjunction with the rubber pads 712 provided on both sides, during the plugging and unplugging process of the connector, the pin 9 is subjected to axial stresses of extrusion and tension. The elastic squeezing of the ball 711 and the rubber pad 712 can achieve a certain degree of compensation effect. At the same time, the wire 67 connected to the end of the pin 9 is also pulled and moved slightly. At this time, the frame rod 79 can rotate in the opposite direction to flatten the wire 67, so that the bent section reserved for the wire 67 can be used as compensation for tensile displacement, thereby avoiding the situation where the wire 67 is stretched and broken after multiple plugging and unplugging. During the plugging and use of the connector, the operation of the peripheral equipment causes the connector to vibrate. The anti-slip ring 65 provided on the outside of the stress relief sleeve 64 increases the friction between the stress relief sleeve 64 and the inner surface of the housing 4. The rubber pad 712 reduces the vibration transmission to the pin 9, thereby effectively improving the assembly integration effect of the connector, and preventing the connection of the pin 9 from breaking during vibration.

[0048] After the wire 67 is pre-bent and set, the strain relief sleeve 64 and plastic plate 8 are slid into the housing 4 via the guide ridges 61. The end of the strain relief sleeve 64 reaches the interior of the terminal block 2. The dome-shaped telescopic column 63 remains compressed and reaches the internal slot of the mounting base 3. The spring force pushes the dome-shaped telescopic column 63 upward and into the slot. Because multiple dome-shaped telescopic columns 63 are evenly spaced, the shear stress applied to the mounting base 3 during plugging, unplugging, or use of the connector is evenly distributed. The mounting base 3 and the strain relief sleeve 64 are bolted together from both sides with the locating bolts 62, further enhancing stability.

[0049] After the stress relief sleeve 64 is installed, the docking connector is inserted into the pin 9 and threadedly connected to the housing 4. After installation and docking, it can be powered on and used. When this connector is used, it has good vibration resistance and can cope with multiple plugging and unplugging.

[0050] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0051] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An electrical connector that is not easy to break, comprising a fixing plate (1), a terminal (2) fixedly connected to one side of the fixing plate (1), a mounting seat (3) fixedly connected to the other side of the fixing plate (1), a shell (4) fixedly connected to the side wall of the mounting seat (3), a rubber ring (5) clamped at the end of the shell (4), a plastic plate (8) slidably abutted against the inner cavity of the shell (4), and pins (9) equidistantly plugged into the plastic plate (8), characterized in that: Also includes: A positioning and anti-slip mechanism (6), wherein the positioning and anti-slip mechanism (6) is connected to the housing (4); a compensating anti-breakage mechanism (7), wherein the compensating anti-breakage mechanism (7) is connected to the positioning anti-slip mechanism (6); The positioning and anti-slipping mechanism (6) extends and positions the plastic plate (8), and the compensating and anti-breaking mechanism (7) assists the positioning and anti-slipping mechanism (6) in bending and laying the wire, thereby reserving stretching space; The positioning and anti-slip mechanism (6) includes a stress-relieving sleeve (64) fixed to the side wall of the plastic plate (8) by bolts, a plurality of anti-slip rings (65) are fixed to the outer wall of the stress-relieving sleeve (64), at least one pair of guide ridges (61) are fixed to the inner surface of the housing (4) at equal intervals, and the stress-relieving sleeve (64) and the plastic plate (8) are slidably connected to the guide ridges (61) through grooves.

2. The non-breakable electrical connector according to claim 1, wherein: The stress relief sleeve (64) is slidably connected to a first hub (66) and a second hub (68) on both sides, and an electric wire (67) is fixedly passed through the first hub (66) and the second hub (68), and the electric wire (67) is in a centrally gathered state after passing through the first hub (66) and the second hub (68) from a divergent state on both sides.

3. The non-breakable electrical connector according to claim 1, wherein: A plurality of dome telescopic columns (63) are equidistantly and slidably connected to the upper and lower sides of the stress relief sleeve (64); the dome telescopic columns (63) are elastically connected to the relief sleeve (64); and the upper and lower sides of the stress relief sleeve (64) are threadedly connected to the mounting seat (3) via positioning bolts (62).

4. The non-breakable electrical connector according to claim 1, wherein: The compensating anti-breakage mechanism (7) includes a pair of bases (76) fixed in the stress relief sleeve (64), the tops of the bases (76) are rotatably connected to the slide rods (73), the ends of the slide rods (73) are rotatably connected to the push plates (72), and the side walls of the push plates (72) are vertically slidably connected to the side walls of the second hub (68).

5. The non-breakable electrical connector according to claim 4, characterized in that: The middle chutes of the pair of chute rotating rods (73) are both slidably connected to a U-shaped plate (77) via a connecting shaft, and the pair of U-shaped plates (77) are commonly fixed to a lifting plate (78).

6. The non-breakable electrical connector according to claim 5, characterized in that: A threaded rod (75) is threadedly connected to the middle portion of the lifting plate (78), and the threaded rod (75) is rotatably connected to the stress relief sleeve (64) via a rotating sleeve (74).

7. The non-breakable electrical connector according to claim 2, wherein: The end of the electric wire (67) passing through the second hub (68) is fixedly connected to the plug pin (9), and a ball (711) is fixedly connected to the root of the plug pin (9). Hook grooves (71) are provided on both side edges of the plastic plate (8).

8. The non-breakable electrical connector according to claim 7, wherein: A frame rod (79) is provided through the outer wall of the electric wire (67). The frame rod (79) is divided into an upper and a lower part. The upper and lower parts of the frame rod (79) are connected by a rectangular plug-in block (710).

9. The non-breakable electrical connector according to claim 7, wherein: The outer wall of the insertion pin (9) is sleeved with a rubber pad (712), which is fixedly connected to the plastic plate (8). The rubber pad (712) is divided into two parts and abuts against the outer wall of the ball (711) from both sides.

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