CN116207553A - Connector assembly and connector mechanism - Google Patents

Abstract

The invention provides a connector assembly, which comprises a connector body, a fastener and at least one conductive connecting piece, wherein the connector body is provided with at least one through cavity and at least one inserting groove which is radially communicated with the cavity, the conductive connecting piece is provided with an inserting part which is inserted into the inserting groove, the inserting part is provided with a through hole, the fastener is at least partially arranged in the cavity and penetrates through the through hole, and the fastener is configured to be movable in the cavity along the radial direction. According to the invention, through the through hole, the fastener can move in the radial direction in the through hole, the position of the deconcentrator connected according to the requirement can be moved and accurately adjusted, and the adaptability is higher.

Description

Connector assembly and connector mechanism

Technical Field

The present disclosure relates to electrical connectors, and particularly to a connector assembly and a connector mechanism.

Background

Along with the development of the field of new energy automobiles, the application proportion of the high-voltage electric connector on the automobiles is higher and higher, and the electric automobiles are developed more and more widely. The power battery system is an important component of an electric automobile. The connector serves as a key use component of the power battery system and serves as a connecting device for transmitting high voltage and large current. With the wide application of the connector in high-voltage electric energy transmission, the safety and reliability of the connector are also more and more concerned, and the protection of the whole current loop is also more and more important, and with the more complex of the circuit, the more urgent is the requirement of the electric connector. At present, a connector assembly used in a new energy automobile is of a fixed structure, and the installation environment conditions are different, and the outgoing positions of cables to be connected of the connector assembly are different due to errors and the like, so that the connector assembly of the fixed structure cannot be applied to connection of different cables, that is, the wiring end of the connector cannot be offset and adjusted, and the connector assembly cannot be connected with the installed cables.

Disclosure of Invention

It is an object of the present invention to provide a connector assembly and a connector mechanism that solve the problem of failure to shift and adjust the position after the fastener passes through the through hole.

According to the invention there is provided a connector assembly comprising a connector body provided with at least one through cavity and at least one socket radially through the cavity, a fastener having a socket part in socket connection with the socket, the socket part being provided with a through hole, and at least one electrically conductive connection member at least partially disposed in the cavity and passing through the through hole, the fastener being configured to be movable in a radial direction within the cavity.

Preferably, the fastener comprises a flat cap body, a column body and a rotating part, wherein the column body and the rotating part are respectively connected with two side surfaces of the cap body, and the radial dimension of the cap body is larger than the radial dimension of the column body and the radial maximum dimension of an circumscribed circle of the rotating part.

Preferably, the radial minimum dimension of the cavity is greater than or equal to the diameter of the cap body, and the height of the cavity is greater than the sum of the heights of the cap body and the rotating part.

Preferably, the rotating part and at least part of the cap body are both provided with an insulating layer.

Preferably, one of the side walls of the inserting part and the inserting groove is provided with at least one clamping groove, the other is provided with a spring plate corresponding to the clamping groove, and the spring plate is provided with a clamping protrusion clamped with the clamping groove.

Preferably, the inserting portion is provided with the clamping groove along two sides of the direction of inserting into the inserting groove, an opening is formed in the side wall of the inserting groove, one end of the elastic piece is connected with the opening, the other end of the elastic piece is a free end, and the free end is bent towards the direction of the clamping groove to form the clamping protrusion.

Preferably, the through hole is a strip hole, the width of the strip hole is larger than or equal to the diameter of the column body and smaller than the diameter of the cap body, the column body is at least partially a threaded column, and the threaded column at least partially protrudes out of the cavity.

Preferably, at least one reinforcing rib is circumferentially distributed on the inner wall of the cavity, and the inscribed diameter of the reinforcing rib is larger than the diameter of the cap body.

Preferably, the conductive connecting piece further comprises a transmission part and a connecting part, one end of the transmission part is connected with the plug-in part, the other end is connected with the connecting part,

preferably, at least one bending part is arranged on the transmission part, and at least part of the bending part is made of flexible materials.

Preferably, the two ends of the bending section are respectively provided with a first mounting hole and at least one second mounting hole which is movable relative to the first mounting hole, and the ratio range of the movable distance of the center point of the second mounting hole relative to the center point of the first mounting hole to the diameter of the first mounting hole is as follows: 0.11:1-1.9:1.

preferably, the number of the cavities and the conductive connecting pieces is multiple, the axes of the multiple cavities are parallel, and the multiple conductive connecting pieces are respectively spliced with the splicing grooves of the corresponding cavities.

Preferably, the opening directions of the plurality of plugging grooves face the same direction.

Preferably, the axes of the plurality of cavities are in the same installation plane, the through holes are elongated holes, and the length extension direction of the elongated holes is parallel to the installation plane.

Preferably, at least part of the plugging part is provided with a plating layer, and the plating layer is made of one of nickel, cadmium, manganese, zirconium, cobalt, tin, titanium, chromium, gold, silver, zinc, tin-lead alloy, silver-antimony alloy, palladium-nickel alloy, graphite silver, graphene silver and silver-gold-zirconium alloy.

Preferably, one of the plugging part and the transmission part is made of copper, the other is made of aluminum, and a copper-aluminum eutectic is arranged between the plugging part and the transmission part.

Preferably, the ratio of the unfolded length of the bending part to the linear distance between the two ends of the bending part is 1:0.05-1:0.98.

the invention also provides a connector mechanism comprising any of the connector assemblies and splitters described above, the connector assemblies and splitters being locked and electrically connected by fasteners.

The beneficial effects of the invention are as follows:

the connector body is provided with the through cavity and the inserting groove, the inserting part of the conductive connecting piece is inserted into the inserting groove, the inserting part is provided with the through hole, the fastening piece penetrates through the cavity and the through hole respectively and can move in the radial direction in the cavity, namely, the fastening piece can be adjusted in position in the through hole according to the connected deconcentrator, so that the connector and the deconcentrator can be quickly and easily installed and connected in a fastening way.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a schematic structural view of a connector assembly according to the present invention.

Fig. 2 is a schematic structural view of the connector body of the present invention.

Fig. 3 is an exploded view of a connector assembly according to the present invention.

Fig. 4 is a schematic view of another structure of a connector assembly according to the present invention.

Fig. 5 shows that the ratio of the unfolded length of the bending portion to the linear distance between the two ends of the bending portion is 1: bending diagram of 0.05.

Fig. 6 shows that the ratio of the unfolded length of the bending portion to the linear distance between the two ends of the bending portion is 1:0.98.

The figures are marked as follows:

1-conductive connecting piece, 121-kink, 11-grafting portion, 12-transmission portion, 13-connecting portion, 14-joint groove, 16-through-hole, 2-connector body, 211-opening, 22-cavity, 23-grafting groove, 24-shell fragment, 241-joint protruding, 3-fastener, 31-rotation portion, 32-cap body, 33-cylinder.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.

The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.

As shown in fig. 1-4, the present invention provides a connector assembly comprising a connector body 2, a fastener 3 and at least one conductive connecting member 1, said connector body 2 being provided with at least one through cavity 22 and at least one insertion groove 23 radially penetrating said cavity 22, said conductive connecting member 1 having an insertion portion 11 inserted into said insertion groove 23, said insertion portion 11 being provided with a through hole 16, said fastener 3 being at least partially disposed within said cavity 22 and passing through said through hole 16, said fastener 3 being configured to be movable in a radial direction within said cavity 22.

At present, after a fastener passes through a circular through hole, the fastener cannot shift and adjust due to the fact that a translational movement space is not available, and when the fastener is installed, the position deviation cannot be centered, the fastener cannot correspond to the installation position, and the connector assembly cannot be connected with a deconcentrator due to the fact that labor and working hours are wasted.

The connector body 2 is provided with a through cavity 22 and a plugging groove 23, the plugging part 11 of the conductive connecting piece is plugged with the plugging groove 23, the plugging part 11 is provided with a through hole 16, the fastening piece 3 respectively penetrates through the cavity 22 and the through hole 16, and is movable in the cavity 22 along the radial direction, namely, the fastening piece 3 can be adjusted to be positioned in the through hole 16 according to the position of a connected preset deconcentrator, so that the mounting connection can be realized quickly and easily, the connector and the deconcentrator are fastened and connected, and the electric connection is realized.

In some embodiments, the fastener 3 includes a flat cap 32, and a post 33 and a rotating portion 31 respectively connected to two sides of the cap 32, where a radial dimension of the cap 32 is greater than a radial dimension of the post 33 and a radial maximum dimension of an circumscribed circle of the rotating portion 31.

The radial dimension of the cap body 32 is larger than the radial dimension of the column body 33, so that the fastener 3 can be prevented from falling off after passing through the through hole 16, and the radial dimension of the cap body 32 is larger than the radial dimension of the column body 33 and the radial maximum dimension of the circumscribing circle of the rotating part 31, so that enough operation space for screwing the rotating part 31 is provided for installation.

In some embodiments, the radial minimum dimension of the cavity 22 is greater than or equal to the diameter of the cap 32, and the height of the cavity 22 is greater than the sum of the heights of the cap 32 and the rotating portion 31.

The radial minimum size of cavity 22 is greater than or equal to cap body 32 diameter, can guarantee that the fastener 3 that has cap body 32 passes through cavity 22 smoothly, and the height of cavity 22 is greater than the sum of cap body 32 and rotation portion 31 height, and this design cavity 22 can furthest protect the superstructure of fastener 3, prevents that it from colliding with the back and becoming flexible, damaging and the emergence of drop phenomenon, and then has guaranteed the security in the conductive process.

In some embodiments, an insulating layer is disposed on both the rotating portion 31 and at least a portion of the cap 32.

The insulating layer has electrical insulation property and is mainly used for preventing metal conductors from touching each other to cause short circuit; the insulating layer is also used for isolating the electric wire to prevent people from being injured by electric shock, and can protect the outside, for example, the rotating part 31 and at least part of the cap body 32 from corrosion, aging, external force, external impurities and moisture, and the insulating layer plays a role in protecting.

In some embodiments, one of the side walls of the plugging portion 11 and the plugging slot 23 is provided with at least one clamping slot 14, the other is provided with a spring piece 24 corresponding to the clamping slot 14, and the spring piece 24 is provided with a clamping protrusion 241 clamped with the clamping slot 14.

The grafting portion 14 inserts in the grafting groove 23, until joint groove 14 and the bellied 241 joint of joint, guaranteed that grafting portion 11 is preliminarily fixed with the preset position of connector body 2, the cavity 22 and through-hole 16 that follow-up fastener 3 can be fast passed of being convenient for, improvement installation rate and precision.

In some embodiments, the plugging portion 11 is provided with the clamping groove 14 along two sides of the direction of inserting into the plugging groove 23, an opening 211 is provided on the side wall of the plugging groove 23, one end of the elastic sheet 24 is connected with the opening 211, and the other end is a free end, and the free end is bent towards the direction of the clamping groove 14 to form the clamping protrusion 241.

After the connector body 2 is injection molded, an opening 211 is machined, one end of a spring piece 24 is connected with the opening 211, the spring piece 24 and the connector body 2 are integrated, the free end of the spring piece 24 is bent towards the clamping groove 14 to form a clamping protrusion 241 and the clamping groove 14 to be clamped, the plug-in part 11 is clamped and fixed in the plug-in groove 23, and the conductive connecting piece 1 is prevented from falling off from the plug-in groove 23.

In some embodiments, as shown in fig. 4, the through hole 16 is an elongated hole, and the width of the elongated hole is greater than or equal to the diameter of the pillar 33 and smaller than the diameter of the cap 32, and the pillar 33 is at least partially a threaded pillar, and the threaded pillar protrudes at least partially out of the cavity 22.

The width of the strip hole is larger than or equal to the diameter of the column body 33, so that the main body 33 can pass through the strip hole, the width of the strip hole is smaller than the diameter of the cap body 32, and the fastener 3 is prevented from falling from the strip hole after passing through the through hole 16.

In some embodiments, at least one reinforcing rib is circumferentially distributed on the inner wall of the cavity 22, and the inscribed diameter of the reinforcing rib is larger than the diameter of the cap 32.

The strength of the cavity 22 can be improved due to the arrangement of the reinforcing ribs, the service life of the cavity is prolonged, and meanwhile, the side wall of the wall 22 is not easy to damage in the repeated dismounting and inserting processes of the fastener 3.

In some embodiments, the conductive connector 1 further includes a transmission portion 12 and a connection portion 13, where one end of the transmission portion 12 is connected to the socket portion 11, and the other end is connected to the connection portion 13.

The transmission portion 12, the plug portion 11, and the connection portion 13 are integrally formed, or one end of the transmission portion 12 may be welded to the plug portion 11, and the other end may be welded to the connection portion 13.

In some embodiments, at least one bending portion 121 is disposed on the transmission portion 12, and at least a portion of the bending portion 121 is made of a flexible material.

The bending part 121 is designed to bend according to the connection direction or to bend correspondingly according to the arrangement requirement of the installed environment space, and the connector can be suitable for more use environments.

The material of the bending part 121 is flexible, and the flexible material can be bent to different trend requirements of suitable angle matching connection positions and is suitable for different installation and arrangement spaces.

In some embodiments, the two ends of the bending part 121 are respectively provided with a first mounting hole and at least one second mounting hole which is movable relative to the first mounting hole, and the ratio of the movable distance of the center point of the second mounting hole relative to the center point of the first mounting hole to the diameter of the first mounting hole is in the range of: 0.11:1-1.9:1.

the inventor selects a range of ratio of the movable distance of the center point of the second mounting hole to the center point of the first mounting hole to the diameter of the first mounting hole to connect the conductive member to test whether the ratio affects the connection of the conductive member and whether the conductivity is sufficient, and the test result is shown in table 1.

Table 1 whether the ratio of the movable distance of the center point of the second mounting hole to the center point of the first mounting hole to the diameter of the first mounting hole affects whether the connection conductive member and the conduction are sufficient:

as can be seen from table 1, the ratio of the movable distance of the center point of the second mounting hole to the center point of the first mounting hole to the diameter of the first mounting hole ranges from less than 0.11:1, the moving distance is too small to be adjusted and connected to the conductive piece; the ratio of the movable distance of the center point of the second mounting hole relative to the center point of the first mounting hole to the diameter of the first mounting hole is in a range of greater than 1.9:1, the aperture of the mounting hole is relatively large, the conductive contact area is small, and the conductivity is insufficient; only when the ratio is 0.11:1-1.9: in the interval 1, the electric conduction can be realized, and the electric connection can be realized, so that the inventor selects the most suitable ratio range of the movable distance of the center point of the second mounting hole relative to the center point of the first mounting hole to the diameter of the first mounting hole to be 0.11:1-1.9:1.

in some embodiments, the number of the cavities 22 and the conductive connectors 1 is plural, the axes of the plural cavities 22 are parallel, and the plural conductive connectors 1 are respectively plugged into the plugging slots 23 of the corresponding cavities 22.

The axes of the cavities 22 are parallel, so that after the conductive connecting pieces 1 are respectively inserted into the insertion grooves 23 of the corresponding cavities 22, the fasteners 3 can be synchronously and rapidly installed in the cavities 22 and the through holes 16 in the same direction, and the installation efficiency is improved.

In some embodiments, the opening directions of the plurality of the plugging slots 23 are oriented in the same direction.

The design can enable a plurality of conductive connecting pieces 1 to be synchronously inserted into the inserting grooves 23 in the same direction, improves the installation speed and saves the working time of workers.

In some embodiments, the axes of the plurality of cavities 22 are in the same mounting plane, and the through holes 16 are elongated holes, and the length extension direction of the elongated holes is parallel to the mounting plane.

The length extension direction of the strip hole is parallel to the installation plane, so that the position can be adjusted by displacement in the direction parallel to the installation plane after the fastener 3 passes through the through hole 16.

Preferably, the plugging portion 11 is at least partially provided with a plating layer, and the plating layer is made of one of nickel, cadmium, manganese, zirconium, cobalt, tin, titanium, chromium, gold, silver, zinc, tin-lead alloy, silver-antimony alloy, palladium-nickel alloy, graphite silver, graphene silver and silver-gold-zirconium alloy. The plating layer setting mode is as follows: the plating layer is arranged in a manner of electroplating, chemical plating, magnetron sputtering or vacuum plating.

Electroplating is a process of plating a thin layer of other metals or alloys on the surface of some metals using the principle of electrolysis.

Electroless plating is a process in which a metal is deposited by a controlled redox reaction under the catalytic action of the metal.

The magnetron sputtering method utilizes the interaction of a magnetic field and an electric field to lead electrons to spirally run near the surface of a target, thereby increasing the probability of the electrons striking argon to generate ions. The generated ions are bumped against the target surface under the action of an electric field so as to splash out the target material.

The vacuum plating method is to deposit various metal and non-metal films on the surface of the plastic part by distillation or sputtering under vacuum condition.

In some embodiments, one of the plugging portion 11 and the transmitting portion 12 is made of copper, the other is made of aluminum, and a copper-aluminum eutectic is formed between the plugging portion 1 and the transmitting portion 12.

Preferably, in this embodiment, the material of the plugging portion 11 is copper, the material of the transmission portion 12 is aluminum, and a copper-aluminum eutectic is formed between the plugging portion 11 and the transmission portion 12.

The material of the plug-in part 11 is copper, which meets the requirements of the conductor on high conductivity, enough mechanical property, chemical stability resistance, convenience in processing, good welding performance and the like. Copper has excellent physical and chemical properties, excellent electrical conductivity and thermal conductivity, and high corrosion resistance to atmosphere and water.

The material of the transmission part 12 is aluminum, the conductivity of aluminum is inferior to silver and copper, and the conductivity of aluminum is only 2/3 of that of copper, but the density of aluminum is only 1/3 of that of copper, so that the aluminum wire is light and low in cost due to the fact that the aluminum wire is only half of that of copper wire and the same amount of electricity is transmitted. The oxide film on the surface of aluminum has not only corrosion resistance but also a certain insulation property, so that aluminum has a wide range of applications in the electric appliance manufacturing industry, the wire and cable industry and the radio industry. The copper-aluminum eutectic is arranged between the plug-in part 11 and the transmission part 12, so that the two parts can be well fused and connected together to realize electric connection.

Preferably, the ratio of the unfolded length of the bending part 121 to the linear distance between the two ends of the bending part 121 is 1:0.05-1:0.98.

the inventors have tested whether the ratio can absorb energy and ensure that the conductive members connected to both ends are electrically connected by selecting the transmission parts 12 having different ratios of the expansion lengths of the bent parts 121 to the linear distances between both ends of the bent parts 121, and the test results are shown in table 2.

Table 2, whether the different ratio absorbs energy or not, and whether the conductive members connected to the two ends can be guaranteed to realize electrical connection:

as can be seen from table 2, the ratio of the developed length of the bent portion 121 to the linear distance between the both ends of the bent portion 121 is greater than 1: when 0.05, the two ends are too short to be connected to the conductive pieces at the two ends; the ratio of the unfolded length of the bent portion 121 to the linear distance between both ends of the bent portion 121 is less than 1: at 0.98, energy cannot be absorbed; only when the ratio is 1:0.05-1: during the interval of 0.98, energy can be absorbed and electric connection can be realized, so that the inventor selects the ratio of the most suitable unfolding length of the bending part 121 to the linear distance between two ends of the bending part 121 to be 1:0.05-1:0.98.

as shown in fig. 5 and 6, the folded length of the folded portion 121 is L2, the linear distance between the two ends of the folded portion 121 is L1, and fig. 5 is L2:l1 is 1:0.05, wherein the bending degree reaches the maximum, and the conductive parts at the two ends cannot be connected after the bending, and fig. 6 is L2, where L1 is 1:0.98, at this time, the bending degree is smaller, so that the energy absorbing capacity is smaller, and if the bending degree is smaller than the bending degree, the problem that energy cannot be absorbed occurs.

The invention also provides a connector mechanism comprising any of the connector assemblies and splitters described above, which are locked and electrically connected by fasteners 3.

While certain specific embodiments of the invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (18)

1. A connector assembly comprising a connector body, a fastener and at least one electrically conductive connecting member, characterized in that the connector body is provided with at least one through cavity and at least one socket radially through the cavity, the electrically conductive connecting member has a socket part in socket connection with the socket, the socket part is provided with a through hole, the fastener is at least partially arranged in the cavity and passes through the through hole, and the fastener is configured to be movable in a radial direction in the cavity.

2. A connector assembly according to claim 1, wherein said fastener comprises a flat cap, and a cylindrical body and a rotating portion respectively connected to both sides of said cap, and a radial dimension of said cap is larger than a radial dimension of said cylindrical body and a radial maximum dimension of an circumscribed circle of said rotating portion.

3. The connector assembly of claim 2, wherein said cavity has a radial minimum dimension equal to or greater than said cap diameter, and wherein said cavity has a height greater than a sum of said cap and said swivel.

4. A connector assembly according to claim 2, wherein the swivel and at least part of the cap are provided with an insulating layer.

5. The connector assembly according to claim 1, wherein one of the plugging portion and the plugging slot side wall is provided with at least one clamping slot, the other is provided with a spring plate corresponding to the clamping slot, and the spring plate is provided with a clamping protrusion clamped with the clamping slot.

6. The connector assembly according to claim 5, wherein the insertion portion is provided with the engaging groove along two sides of the insertion groove, an opening is provided in a side wall of the insertion groove, one end of the spring is connected to the opening, and the other end is a free end, and the free end is bent toward the engaging groove to form the engaging protrusion.

7. A connector assembly according to claim 2, wherein the through hole is an elongated hole having a width equal to or greater than the diameter of the post and less than the diameter of the cap, the post being at least partially a threaded post, the threaded post protruding at least partially out of the cavity.

8. The connector assembly of claim 2, wherein the cavity inner wall is circumferentially provided with at least one stiffener having an inscribed diameter greater than the diameter of the cap.

9. The connector assembly of claim 1, wherein the conductive connector further comprises a transmission portion and a connection portion, wherein one end of the transmission portion is connected to the plug portion, and the other end is connected to the connection portion.

10. The connector assembly of claim 9, wherein the transmission portion is provided with at least one bending portion, and at least a portion of the bending portion is made of a flexible material.

11. The connector assembly of claim 10, wherein the bent segment has a first mounting hole and at least one second mounting hole movable relative to the first mounting hole at each end, the second mounting hole having a center point in a range of a ratio of a movable distance of the center point of the second mounting hole relative to the center point of the first mounting hole to a diameter of the first mounting hole: 0.11:1-1.9:1.

12. the connector assembly of claim 1, wherein the number of cavities and conductive connectors is plural, the axes of the plural cavities are parallel, and the plural conductive connectors are respectively plugged into the plugging slots of the corresponding cavities.

13. A connector assembly according to claim 12, wherein the plurality of said mating grooves are oriented in the same direction.

14. The connector assembly of claim 12, wherein the axes of the plurality of cavities are in the same mounting plane, the through holes are elongated holes, and the length extension direction of the elongated holes is parallel to the mounting plane.

15. The connector assembly of claim 1, wherein the plug portion is at least partially provided with a plating layer, and the plating layer is made of one of nickel, cadmium, manganese, zirconium, cobalt, tin, titanium, chromium, gold, silver, zinc, tin-lead alloy, silver-antimony alloy, palladium-nickel alloy, graphite-silver, graphene-silver, and silver-gold-zirconium alloy.

16. The connector assembly of claim 9, wherein one of the plug portion and the transfer portion is copper and the other is aluminum, and wherein a copper-aluminum eutectic is provided between the plug portion and the transfer portion.

17. The connector assembly of claim 10, wherein the ratio of the unfolded length of the bent portion to the linear distance between the two ends of the bent portion is 1:0.05-1:0.98.

18. a connector mechanism comprising a connector assembly according to any one of claims 1 to 17 and a wire divider, the connector assembly and wire divider being locked and electrically connected by a fastener.

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