Bicyclic strain relief and shielding clip

Abstract

A double loop strain relief and shielding clip for securing a cable to an electrical device and shielding the cable, comprising a metal carrier, a strip, in particular a metal strip, and a rewinder. The strip is configured to form a first loop and a second loop. The rewinder is configured to wind the strip to shield the cable with the first loop of the strip and to secure the cable to the metal carrier with the second loop of the strip, wherein the first loop of the strip encloses the cable and the second loop of the strip encloses the cable and a fixed portion of the metal carrier.

Description

Technical Field

[0001] This disclosure relates to a double-ring strain relief and shielding clip, a method for securing a cable to an electrical installation, and an electrical installation. Background Technology

[0002] Cables to electrical installations typically terminate at plugs, connectors, or cable glands. Several forces, such as tensile, compressive, torsional, or bending forces, can act on the cable, potentially causing it to detach from the plug or even break. Strain relief clips protect the connection between the cable and the termination from mechanical stress and secure the cable to the electrical installation.

[0003] On the other hand, cable shielding can also be important, for example in industrial environments such as automation technology, process automation, and mechanical engineering, or in automotive applications. Shielding can, for example, protect cables from electromagnetic interference, thereby optimizing data transmission in data cables. At the same time, shielding can prevent electromagnetic interference from emanating from the cable and interfering with other cables or electronic components.

[0004] Therefore, there is a need for a strain relief and shielding clip that is configured to shield the cable and simultaneously secure it.

[0005] This requirement is met by the double-ring strain relief and shielding clips as described in this article, and by the method of using double-ring strain relief and shielding clips to secure and shield cables. Summary of the Invention

[0006] This disclosure provides, according to the independent claims, a double-ring strain relief and shielding clip for securing and shielding cables to an electrical installation, a method for securing cables to an electrical installation and / or shielded cables using the double-ring strain relief and shielding clip, and the electrical installation itself. Examples can be obtained from the dependent claims, the specification, and the drawings.

[0007] In one aspect, this disclosure relates to a double-loop strain relief and shielding clamp for securing electrical installations and shielded cables. The double-loop strain relief and shielding clamp includes a carrier (e.g., a metal carrier), a strip (particularly a metal strip), and a rewinding machine. The strip is configured to form a first loop and a second loop. The rewinding machine is configured to wind the strip to shield the cable using the first loop of the strip and to secure the cable to the carrier using the second loop of the strip, wherein the first loop of the strip surrounds the cable, and the second loop of the strip surrounds the cable and the securing portion of the metal carrier.

[0008] The carrier can be configured to attach the double-ring strain relief and shielding clip to the electrical installation. The carrier, particularly in the form of a metal carrier, can be further configured to shield the cable by conducting electromagnetic interference from the electrical installation through the metal carrier to the metal strips of the double-ring strain relief and shielding clip and the cable's shielding braid, or vice versa. An electrical connection (e.g., via the strips) can be established between the cable's shielding braid and the metal carrier of the double-ring strain relief and shielding clip to conduct electromagnetic interference.

[0009] It should be understood that the terms "metal strip," "metal carrier," or "metal strain relief and shielding clip" used below refer only to the "strip," "carrier," or "strain relief and shielding clip," respectively, and are unrelated to the material of the strip, carrier, or clip. The disclosure herein applies not only to "metal strain relief and shielding clips" but also to "(metal) strain relief clips."

[0010] The strip can be a flat, single piece of metal, preferably without gaps or slits. On the one hand, the strip can be extremely flexible and therefore very thin. On the other hand, the strip can be strong enough to withstand high forces acting on it when the cable is secured and shielded by it. The strip and all other metal components described herein (e.g., metal carriers) can be made of conductive materials. However, the strip can alternatively be made of non-conductive materials, such as plastics.

[0011] The first loop of the metal strip can describe a portion of the strip that begins at a first end of the strip that can be attached to a metal carrier. The second loop of the metal strip can describe another portion of the strip that begins at the end of the first loop in the region of the first end of the strip. Therefore, the first loop can be incorporated into the second loop in the region of the first end of the strip. The second loop can terminate at a second end of the strip that can be attached to a rewinder.

[0012] The first loop of the metal strip can form a cylindrical enclosure for the cable, preferably without any remaining gaps. This prevents the "soft" cable material of the cable insulation from "flowing" under pressure and over time, and the cable's shielding braid can be perfectly bonded under continuous pressure. With the double-loop metal strain relief and shielding clips described herein, the cable's shielding braid is not subjected to any form of stress, and shielding is achieved without the need for conductive tape. Furthermore, a rewinding machine can be used to achieve high compression force to tighten the first loop around the cable's shielding braid, and the shielding is almost "airtight" sealed and thus protected from corrosion.

[0013] The second loop of the metal strip provides the necessary strain relief by pressing the cable against the conductive shielding plate of the double-loop metal strain relief and shielding clip (described in more detail below), while the first loop of the metal strip prevents the cable from being flattened at the same time.

[0014] Rewinders can be cylindrical and, like metal carriers and metal strips, made of conductive materials. However, rewinders can also have different shapes suitable for winding metal strips. Furthermore, it should be understood that rewinders can be made of non-conductive materials, such as plastic.

[0015] The rewinder can also be configured to attach and release cables from a metal carrier. The cable is attached to the metal carrier by winding a metal strip onto the rewinder. The cable is released or separated from the metal carrier by unwinding the metal strip from the rewinder. When the metal strip is wound onto the rewinder, i.e., when the double-ring metal strain relief and shielding clip are assembled, the cable is secured to the metal carrier by the second ring of the metal strip, while the first ring of the metal strip shields the cable from electromagnetic interference. Therefore, the double-ring metal strain relief and shielding clip combines the effects of strain relief and cable shielding.

[0016] According to an embodiment, a first end of the metal strip is attached to a metal carrier, and a second end of the metal strip is attached to a rewinding machine. The first end of the metal strip can be attached to the metal carrier by any suitable method, such as welding, brazing, riveting, plugging, or threading. The attachment of the first end of the metal strip to the metal carrier can be permanent or temporary. The second end of the metal strip can also be attached to the rewinding machine by any suitable method, such as welding, brazing, plugging, or threading. The attachment of the second end of the metal strip to the rewinding machine can be permanent or temporary. Therefore, the metal strips can be interchangeable.

[0017] According to an embodiment, the rewinder is detachably arranged within a metal carrier. The rewinder can be mounted on the metal carrier, rather than attached to it. Therefore, the metal carrier may include at least one support configured to mount the rewinder. A detachable rewinder allows for easier use of double-ring metal strain relief and shielding clips. For example, before placing the rewinder in at least one support of the metal carrier to wind and tighten the metal strip, the metal strip attached to the rewinder can first be wound around the cable to form a first loop, and then wound around a fixed portion of the cable and the metal carrier to form a second loop. The rewinder can be rotated in the winding direction to tighten the metal strip, for example, by turning the rewinder clockwise using an internal hexagonal screw key in the rewinder's opening. It should be understood that the rewinder can be non-detachably arranged within the metal carrier such that the cable must pass through the pre-formed first and second loops of the metal strip.

[0018] Removing the cable from the double-ring metal strain relief and shielding clips using a removable rewinder may also be more convenient. The rewinder may only need a slight rotation in the unwinding direction, for example, by turning it slightly to the left using the Allen screw key in the rewinder's opening. This movement may be just sufficient to release the tension in the metal strip, allowing the rewinder to be loosely positioned within at least one support of the metal carrier, and then it can be removed. It should be understood that the winding and unwinding directions of the rewinder can be opposite.

[0019] Therefore, the rewinder can be removed from the metal carrier before the metal strip is completely unwound to remove the cable. Thus, the double-ring metal strain eliminator and shielding clamp can be used multiple times. Another advantage of the detachable arrangement of the rewinder is that it eliminates the need to disconnect or remove the plugs or device connectors to which the cable is attached, whether for maintenance or when the cable needs to be removed from the double-ring metal strain eliminator and shielding clamp. When the cable is replaced, all parts of the double-ring metal strain eliminator and shielding clamp can be reused.

[0020] According to an embodiment, the first loop is configured to surround the cable at a substantially 360-degree angle. Most other angles surrounding the cable are also possible, for example, greater than 330 degrees, greater than 300 degrees, or greater than 270 degrees. Specifically, the first loop of the metal strip can be configured to contact the cable's shielding braid over the entire circumference of the cable. This improves the cable's shielding against electromagnetic interference. Furthermore, the first loop can maintain the cable's circular shape without compressing the cable or the electrical conductors within it.

[0021] According to an embodiment, the first ring of the strip is completely arranged within the second ring of the strip. Therefore, the second ring surrounds the first ring, particularly in the assembled state of the double-ring metal strain relief and shielding clip. The first and second rings can be configured such that when the strip is wound using a rewinder, the first ring tightens before the second ring.

[0022] According to an embodiment, the second ring extends along at least two surfaces of the fixing member. The second ring may extend along a vertically arranged surface of the fixing portion, and the second ring may extend along a horizontally arranged surface of the fixing portion. The vertically arranged surface of the fixing portion can be connected to the horizontally arranged surface of the fixing portion by a curved surface defined by a radius, the curved surface being disposed between the vertically and horizontally arranged surfaces of the fixing portion. Therefore, the second ring may extend along the vertically arranged surface, the curved surface, and the horizontally arranged surface of the fixing portion.

[0023] According to an embodiment, a strip extends from a first end of the strip around the cable's shielding braid, around a fixed portion of the metal carrier, and back around the cable's shielding braid to a rewinding machine at a second end of the strip. The route of the metal strip can begin in a first radial direction around the cable, particularly around the cable's shielding braid, and can continue in a first vertical or first inclined direction after the metal strip has surrounded the cable. The metal strip can extend in the first vertical or first inclined direction until a first deflection of the metal strip at the fixed portion of the metal carrier.

[0024] The path of the metal strip can deflect from a first vertical or first inclined direction to a horizontal direction at the first curved surface of the fixed portion. The metal strip can extend in the horizontal direction until the metal strip deflects at the fixed portion of the metal carrier at a second deflection. The path of the metal strip can deflect from a horizontal direction to a second vertical or second inclined direction at the second curved surface of the fixed portion.

[0025] The metal strip may extend in the second vertical or second inclined direction until it surrounds at least a portion of the cable, particularly at least a portion of the cable's shielding braid, in a second radial direction. After the metal strip has encapsulated at least a portion of the cable, the route of the metal strip may continue in a third vertical or third inclined direction. The metal strip may extend in the third vertical or third inclined direction until it ends at the rewinder.

[0026] According to an embodiment, the metal carrier includes a conductive shielding plate, and the rewinder is configured to press the cable onto the arcuate portion of the conductive shielding plate of the metal carrier using a second loop of a metal strip. The conductive shielding plate may be curved.

[0027] The arc of the conductive shield can be described as a bend in the conductive shield. The arc or bend of the conductive shield can be designed according to the diameter of the cable to be attached to the double-ring metal strain eliminator and shielding clip. The arc, and therefore the conductive shield, can preferably be designed such that cables with diameters up to 30 mm can be attached to the double-ring metal strain eliminator and shielding clip. In this case, the arc of the conductive shield can also be 30 mm or larger. Of course, a second ring of metal strip can also be used to firmly press cables with smaller diameters onto the conductive shield. It should be understood that the arc or bend of the conductive shield can also be designed such that cables with diameters greater than 30 mm can also be attached to the conductive shield, and thus to the double-ring metal strain eliminator and shielding clip. Therefore, variations of the double-ring metal strain eliminator and shielding clip are not required, or fewer variations are needed to cover a wide variety of cables.

[0028] The arc of the conductive shielding plate can also prevent the metal strip from twisting, because when the metal strip is wound by the rewinder, the metal strip (especially the first loop of the metal strip) can be guided to rest flat against the conductive shielding plate.

[0029] According to an embodiment, the thickness of the metal strip is between 0.05 mm and 0.3 mm, preferably between 0.1 mm and 0.2 mm, and particularly 0.15 mm. Therefore, the metal strip can be flexible.

[0030] According to an embodiment, the width of the metal strip is between 5 mm and 25 mm, preferably between 15 mm and 20 mm, and particularly 18 mm. Therefore, the cable can be securely attached to the double-ring metal strain relief and shielding clip.

[0031] According to an embodiment, the metal carrier includes at least one support member, particularly two supports configured to receive a rewinding machine, wherein at least one support member is formed as a half-shell. The at least one support member can be vertically arranged above the conductive shielding plate of the metal carrier. The at least one support member can be configured to receive the rewinding machine, wherein a metal strip is arranged between two portions of the support member or between the two supports. The at least one support member formed as a half-shell facilitates the operation of the double-ring metal strain relief and shielding clamp, because the metal strip attached to the rewinding machine can be wound around the cable and the fixed portion of the metal carrier and placed within the half-shell of the at least one support member.

[0032] At least one support member can also be configured to press the double-ring metal strain eliminator and shielding clip against the electrical device, particularly against the fixture of the electrical device. A rewinder arranged in at least one support member can generate a force against at least one support member in the assembled state of the double-ring metal strain eliminator and shielding clip. This force can press the metal carrier against the fixture of the electrical device.

[0033] According to an embodiment, the fixing portion of the metal carrier includes at least one arcuate portion, particularly multiple arcuate portions, configured to deflect the path of the strip. Each of the multiple arcuate portions may define the curvature of the curved surface of the fixing portion. A second loop of the strip may extend along the curved surface of the fixing portion. Thus, when the metal strip, particularly the second loop of the metal strip, surrounds the fixing portion of the metal carrier, the path of the metal strip may be deflected at least twice. At least one or more arcuate portions at the metal carrier may be configured to form the second loop of the metal strip.

[0034] According to an embodiment, the double-ring metal strain relief and shielding clamp further includes a locking portion configured to secure the rewinder in the assembled state of the double-ring metal strain relief and shielding clamp. The locking portion can be configured to prevent the metal strip from unwinding from the rewinder in the assembled state of the double-ring metal strain relief and shielding clamp. Therefore, the rewinder can be locked by the locking portion in the direction corresponding to the unwinding of the metal strip from the rewinder. The locking portion can be made of metal (e.g., spring steel) or plastic.

[0035] According to an embodiment, the rewinder includes a plurality of protrusions arranged on the outer surface of the rewinder. The rewinder can be configured to operate like a ratchet. Each of the plurality of protrusions can be formed as a ramp, wherein the ramps of each of the plurality of protrusions can point in the same direction, specifically in the same direction of rotation of the rewinder. The plurality of protrusions can be evenly distributed at one end of the circumferential surface of the rewinder, so that there can be an equal distance between any two of the plurality of protrusions. At least one of the plurality of protrusions engages with a locking portion in the assembled state of the double-ring metal strain relief and shielding clamp.

[0036] According to an embodiment, the locking portion includes a nose at the metal carrier. At least one of the plurality of protrusions engages with the nose in the assembled state of the double-ring metal strain relief and shielding clip. The nose may be disposed at the metal carrier of the double-ring metal strain relief and shielding clip.

[0037] According to an embodiment, the locking portion includes a flexible arm on the metal carrier. At least one of the plurality of protrusions engages with the flexible arm in the assembled state. The flexible arm may be attached to one end of the metal carrier. The other end of the flexible arm may not be attached to the metal carrier. Therefore, the other end of the flexible arm can move in at least one direction. As a result, the flexible arm can function like a compressed spring. If the flexible arm is compressed, the rewinder, particularly at least one of the plurality of protrusions arranged on the outer surface of the rewinder, may disengage from the locking portion. The rewinder may be rotatably arranged in at least one support of the metal carrier and may slightly "unwind" or self-unwind. It should be understood that the flexible arm may be part of the metal carrier.

[0038] The flexible arm may include a nose or a protrusion, wherein, in the assembled state of the double-ring metal strain relief and shielding clip, at least one of the protrusions engages with the nose or protrusion of the flexible arm.

[0039] According to an embodiment, the locking portion includes a leaf spring with a recess. At least one of the plurality of protrusions is located inside the recess and engages with the edge of the recess in the assembled state. The leaf spring may be attached to one end of the metal carrier. The other end of the leaf spring may not be attached to the metal carrier. Therefore, the other end of the leaf spring can move in at least one direction. As a result, the leaf spring may be depressed. If the leaf spring is depressed, the rewinder, particularly by means of at least one of the plurality of protrusions arranged on the outer surface of the rewinder, can disengage from the locking portion. The rewinder may be rotatably arranged in at least one support of the metal carrier and may be slightly "unwound" or self-unwound.

[0040] The recess can be configured to accommodate protrusions arranged on the outer surface of the rewinder. In particular, the recess can be configured such that each of the plurality of protrusions can enter the recess and exit the recess again as the metal strip is wound onto the rewinder.

[0041] According to an embodiment, the locking portion includes a worm gear, wherein at least one of a plurality of protrusions engages with the worm gear. The plurality of protrusions may be designed as gears. The worm gear may be rotatably arranged on the metal carrier. By rotating the worm gear, the rewinder can rotate in both the winding and unwinding directions. Therefore, by rotating the worm gear in one direction or the other, the metal strip can be wound onto and unwound from the rewinder. Additionally, if the worm gear does not rotate, the rewinder can be locked by the worm gear. The locking portion with the worm gear can provide a stepless and self-locking mechanism for double-ring strain relief and shielding clamps.

[0042] According to an embodiment, the double-ring metal strain relief and shielding clip further includes a mounting portion disposed at the metal carrier and configured to secure the double-ring metal strain relief and shielding clip to the electrical device. The mounting portion may be configured to clip onto the electrical device. Specifically, the mounting portion may be configured to hook and snap into a fastener attached to the electrical device or a frame attached to the electrical device.

[0043] Alternatively, the mounting portion can be configured to be threaded onto the electrical installation. Specifically, the double-ring metal strain eliminator and shielding clip can be secured to the electrical installation using screws, allowing the mounting portion to be screwed onto a fixture or any other type of support attached to the electrical installation or its frame. Therefore, the mechanical strain eliminator can be more robust, and the connection between the double-ring metal strain eliminator and shielding clip and the electrical installation can become more stable over time using the screw-on mounting portion. The high contact pressure of the screws provides a strong, airtight, and corrosion-resistant connection between the double-ring metal strain eliminator and shielding clip and the electrical installation over a long period.

[0044] According to another aspect, this disclosure relates to a method for securing and shielding a cable using a double-loop metal strain relief and shielding clip. The method includes: winding a metal strip around a shielding braid of the cable to form a first loop; winding the metal strip around the first loop and the metal carrier to form a second loop; and using a rewinding machine to wind the metal strip to shield the cable with the first loop of the metal strip and secure the cable to the metal carrier with the second loop of the metal strip, wherein the first loop of the metal strip surrounds the cable, and the second loop of the metal strip surrounds the cable and the securing portion of the metal carrier. It should be understood that the rewinding machine may be arranged in a support at the metal carrier before winding the metal strip using the rewinding machine.

[0045] Alternatively, the double-ring metal strain relief and shielding clip can be pre-assembled, i.e., the first and second rings of the metal strip can already be formed, with the first ring completely arranged within the second ring of the metal strip.

[0046] According to another aspect, a method for securing and shielding a cable using a pre-assembled double-ring metal strain relief and shielding clip may include: pushing the cable through a pre-formed first ring and a pre-formed second ring of a metal strip; using a rewinding machine to wind the metal strip of the pre-assembled double-ring metal strain relief and shielding clip to shield the cable with the first ring of the metal strip and secure the cable to the metal carrier of the pre-assembled double-ring metal strain relief and shielding clip with the second ring of the metal strip, wherein the first ring of the metal strip surrounds the cable and the second ring of the metal strip surrounds the cable and the securing portion of the metal carrier.

[0047] According to another aspect, this disclosure relates to an electrical device including a fastener configured to receive a double-ring metallic strain relief and shielding clip as described herein. The electrical device may be a servo drive, servo amplifier, frequency converter, or any other type of electrical device. The electrical device may be installed inside or outside a control cabinet. It should be understood that the electrical device may be any type of electrical device connected to a cable, which must be securely attached to the electrical device and shielded against electromagnetic interference.

[0048] The mounting bracket may be a heat sink or part of a heat sink attached to the electrical installation. The mounting bracket may be part of the housing or frame of the electrical installation. The mounting bracket may be made of a conductive material, such as die-cast aluminum, and may be grounded. It should be understood that the mounting bracket may also be a mounting plate. The mounting bracket may be configured to transfer high-frequency leakage current from cables, particularly motor cables. Attached Figure Description

[0049] This document describes exemplary embodiments and functions of the present disclosure in conjunction with the following accompanying drawings, which illustrate:

[0050] Figure 1This is a schematic perspective view of the double-ring metal strain relief and shielding clip according to an embodiment;

[0051] Figure 2 This is a schematic front view of the metal strip according to an embodiment;

[0052] Figure 3 yes Figure 1 A schematic front view of a double-ring metal strain relief and shielding clip;

[0053] Figure 4 This is a schematic perspective view of a double-ring metal strain relief and shielding clip including a locking portion having a nose, according to an embodiment.

[0054] Figure 5 This is a schematic perspective view of a double-ring metal strain relief and shielding clip including a locking portion with a flexible arm, according to an embodiment.

[0055] Figure 6 This is a schematic perspective view of a double-ring metal strain relief and shielding clip including a locking portion with a leaf spring, according to an embodiment.

[0056] Figure 7 This is a schematic perspective view of a double-ring metal strain relief and shielding clip including a locking portion with a worm gear, according to an embodiment;

[0057] Figure 8 This is a schematic perspective view of a double-ring metal strain relief and shielding clip, including the mounting portion, according to an embodiment; and

[0058] Figure 9 This is a flowchart illustrating a method for securing and shielding a cable to an electrical device using a double-ring metal strain relief and shielding clip according to an embodiment. Detailed Implementation

[0059] Figure 1 A schematic perspective view of a double-ring metal strain relief and shielding clip 100 according to an embodiment is shown. The double-ring metal strain relief and shielding clip 100 includes a metal carrier 102, a metal strip 104, and a rewinder 106. The double-ring metal strain relief and shielding clip 100 is configured to secure a cable 108 to the metal carrier 102 and shield the cable 108 from electromagnetic radiation.

[0060] Cable 108 may include a plurality of insulated strands 110 embedded in an internal filler material 112. Cable 108 may be a typical motor cable having different sheath layers including a shielding braid 114. The strands 110 or electrical conductors of cable 108 may terminate at a plug (not shown) for connection to an electrical device.

[0061] The rewinder 106 is configured to wind the metal strip 104 and secure the cable 108 to the metal carrier 102. The rewinder 106 can be cylindrically shaped as a roller (in other words, a pulley), rotatably arranged in two supports 126 of the metal carrier 102. Furthermore, the rewinder 106 can be detachably arranged in the metal carrier 102, particularly in the supports 126. A first end of the metal strip 104 is attached to the metal carrier 102, and a second end of the metal strip 104 is attached to the rewinder 106. Therefore, the rewinder 106 can be removed from the metal carrier 102 together with the metal strip 104.

[0062] The double-ring metal strain relief and shielding clamp 100 may include a locking portion 130 configured to secure the rewinder 106 in the assembled state of the double-ring metal strain relief and shielding clamp 100. (The following will...) Figures 4 to 6 Various embodiments of the locking portion 130 are described in more detail below.

[0063] The rewinder 106 of the double-ring metal strain relief and shielding clip 100 includes a plurality of protrusions 128 arranged on the outer surface of the rewinder 106. The plurality of protrusions 128 can be evenly distributed on the surface of the rewinder 106, so that the distance between two protrusions 128 can be equal. Each of the plurality of protrusions 128 can be formed as a ramp. At least one of the plurality of protrusions 128 can engage with the locking portion 130 in the assembled state of the double-ring metal strain relief and shielding clip 100 to secure the rewinder 106 in the assembled state of the double-ring metal strain relief and shielding clip 100.

[0064] Mounting portion 132 can be disposed at metal carrier 102. Mounting portion 132 can be configured to secure the double-ring metal strain relief and shielding clip 100 to electrical device 150, particularly the fastener 148 for securing to electrical device 150 (see...). Figure 8 With the double-ring metal strain relief and shielding clamp 100 assembled, the metal strip 104 can contact the fixing member 148. Therefore, high-frequency leakage current can be directly transferred from the cable 108.

[0065] The mounting portion 132 in this embodiment may include screws 134. Screws 134 can be used to achieve high pressure, thereby forming a long-term, robust, airtight, and corrosion-resistant connection between the double-ring metal strain relief and shielding clip 100 and the electrical device 150.

[0066] Figure 2 A schematic cross-sectional view of a metal strip 104 and a rewinder 106 according to an embodiment is shown. Figure 2The metal carrier 102 is not shown. A metal strip 104 is configured to form a first loop 116 and a second loop 118. The first loop 116 is configured to substantially surround the cable 108, and particularly the shielding braid 114 of the cable 108, at a 360-degree angle. In the assembled state of the double-loop metal strain relief and shielding clip 100, the first loop 116 of the metal strip 104 contacts almost the entire peripheral surface of the shielding braid 114 across the width of the metal strip 104. At the attachment point of the first end 122 of the first loop 116 to the metal carrier 102, and at the merging point of the first loop 116 and the second loop 118 of the metal strip 104, there may be only a small gap 120 between the first loop 116 and the shielding braid 114. The second end 124 of the metal strip 104 can be attached to a rewinder 106.

[0067] Figure 3 It shows Figure 1 A schematic front view of a portion of a double-ring metal strain relief and shielding clip 100. (See diagram) Figure 3 As shown, the first loop 116 of the metal strip 104 surrounds the cable 108, particularly the shielding braid 114 of the cable 108, and the second loop 118 of the metal strip 104 surrounds the fixing portion 156 of the cable 108 and the metal carrier 102. The rewinder 106 may include an opening 136 at its front end. The opening 136 may be hexagonal in shape and configured to receive an internal hexagonal screw key. The rewinder 106 can be rotated using the internal hexagonal screw key. It should be understood that the rewinder 106 can have suitable types of openings 136 with different shapes, such as square openings, slots, Phillips head slots, hexagonal sockets, or knobs. Furthermore, other types of tools can be used to rotate the rewinder 106, such as Phillips head screwdrivers, flathead screwdrivers, socket wrenches, etc.

[0068] The metal strip 104 can be wound onto the rewinder 106 by rotation. During rotation, the first loop 116 of the metal strip 104 can initially contract around the cable 108. Therefore, the cable 108 can be grounded by tightening the first loop 116 around the metal shielding braid 114 of the cable 108 and contacting the first loop 116 with the shielding plate 138 of the metal carrier 102. This provides good shielding for the cable 108; however, the cable 108 itself may not yet be securely fixed to the metal carrier 102. Therefore, the cable 108 can be pressed against the arc of the conductive shielding plate 138 of the metal carrier 102 by means of the second loop 118. Specifically, the rewinder 106 can be configured to press the cable 108, and thus the shielding braid 114 of the cable 108, against the arc of the conductive shielding plate 138 of the metal carrier 102 by tightening the second loop 118 of the metal strip 104. The second ring 118 can press the cable 108 against the conductive shielding plate 138 of the metal carrier 102 and fix the cable to the metal carrier 102.

[0069] The second loops 118 can be pulled together by further rotating the rewinder 106. The cable 108 can be secured to the metal carrier 102 via the second loops 118 of the metal strip 104. Specifically, the rewinder 106 can be configured to secure the cable 108 to the metal carrier 102 by tightening the second loops 118 of the metal strip 104. Therefore, strain relief of the cable 108 can be achieved by securing it to the metal carrier 102 through the second loops 118 of the metal strip 104. Due to the circular surface (cylinder) of the cable, even if the tension of the metal strip 104 is too high, the second loops 118 of the metal strip 104 will not compress the cable 108.

[0070] Figures 4 to 6 Several embodiments of the locking portion 130 are shown in more detail. Figure 4 A schematic perspective view of a double-ring metal strain relief and shielding clip 100 with a locking portion 130 including a nose 140 is shown. The nose 140 may be disposed at a metal carrier 102. In the assembled state of the double-ring metal strain relief and shielding clip 100, at least one of a plurality of protrusions 128 on the outer surface of the rewinder 106 may engage with the nose 140. At least one protrusion 128 may slide over the nose 140 during rotation of the rewinder 106 until the double-ring metal strain relief and shielding clip 100 is in the assembled state, i.e., the first ring 116 and the second ring 118 of the metal strip 104 are pulled together, such that the cable 108 is pressed against the arc of the conductive shielding plate 138 of the metal carrier 102 and secured to the metal carrier 102.

[0071] When the first ring 116 and the second ring 118 are tightened, the rewinder 106 can stop rotating further, and the protrusion 128 that finally pushes past the nose 140 can be blocked by the nose 140, preventing the rewinder 106 from rotating back. Therefore, in the assembled state of the double-ring metal strain relief and the shielding clamp 100, the rewinder 106 is fixed by the locking part 130.

[0072] The cable 108 can be removed from the double-ring metal stress relief and shielding clip 100 by lifting at least one of the protrusions 128 that engage with the nose 140 over the nose 140 using the rewinder 106 (e.g., using the tool in the opening 138). As a result, at least one of the protrusions 128 is no longer engaged with the nose 140, and the metal strip 104 can be unwound from the rewinder 106 to release the cable 108 from the double-ring metal strain relief and shielding clip 100.

[0073] Figure 5 A schematic perspective view of a double-ring metal strain relief and shielding clip 100 according to an embodiment is shown, which includes a locking portion 130 having a flexible arm 142. The flexible arm 142 may be attached to a metal carrier 102 at one end and may be free or unattached to the metal carrier 102 at the other end. Therefore, the flexible arm 142 is movable in one direction. The flexible arm 142 may be configured as additional support for a rewinder 106. Thus, in this embodiment, the rewinder 106 may be rotatably arranged in the two supports 126 and the flexible arm 142. The locking portion 130 may also include a nose 140 attached to the flexible arm 142.

[0074] With the double-ring metal strain relief and shielding clip 100 assembled, at least one of the plurality of protrusions 128 on the outer surface of the rewinder 106 can engage with the flexible arm 142, particularly with the nose 140 attached to the flexible arm 142. At least one protrusion 128 can slide past the nose 140 during rotation of the rewinder 106 until the double-ring metal strain relief and shielding clip 100 is assembled, i.e., the first ring 116 and the second ring 118 of the metal strip 104 are pulled together, causing the cable 108 to press against the arc of the conductive shielding plate 138 of the metal carrier 102 and be secured to the metal carrier 102. As at least one protrusion 128 slides past the nose 140, at least one protrusion 128 can push the flexible arm 142 downwards. After at least one protrusion 128 has completely slid past the nose 140, the nose 140, and therefore the flexible arm 142, can spring back to its initial position. Thus, with Figure 4 Compared to the previous embodiment, the handling of the double-ring metal strain relief and shielding clamp 100 is more convenient because the rewinder 106 remains fully arranged in the support 126 during rotation.

[0075] When the first ring 116 and the second ring 118 are tightened, the rewinder 106 no longer rotates further, and the protrusion 128 of the nose 140, which was finally pushed past the flexible arm 142, can be blocked by the nose 140, preventing the rewinder 106 from rotating back. Therefore, in the assembled state of the double-ring metal strain relief and shielding clamp 100, the rewinder 106 is fixed by the locking part 130.

[0076] By pulling the flexible arm 142 downward at the end of the flexible arm 142 that is not attached to the metal carrier 102, the cable 108 can be released from the double-ring metal strain relief and shielding clip 100. As a result, at least one of the plurality of protrusions 128 no longer engages with the nose 140 of the flexible arm 142, and the metal strip 104 can be unwound from the rewinder 106 to release the cable 108 from the double-ring metal strain relief and shielding clip 100.

[0077] Figure 6 A schematic perspective view of a double-ring metal strain relief and shielding clip 100 including a locking portion 130 with a leaf spring 144 according to an embodiment is shown. The leaf spring 144 may be attached to the metal carrier 102 at one end and may be free or unattached to the metal carrier 102 at the other end. Thus, the leaf spring 144 can move in one direction. The leaf spring 144 may be curved and have an arcuate portion corresponding to the curvature of the outer surface of the rewinder 106. Thus, the leaf spring 144 may be configured as additional support for the rewinder 106. Thus, in this embodiment, the rewinder 106 may be rotatably arranged in the two supports 126 and the leaf spring 144. The leaf spring 144 may also include a recess 146 configured to receive at least one protrusion 128 arranged on the outer surface of the rewinder 106.

[0078] With the double-ring metal strain relief and shielding clip 100 assembled, at least one of the plurality of protrusions 128 on the outer surface of the rewinder 106 can engage with the leaf spring 144, particularly with the edge of the recess 146. During rotation of the rewinder 106, at least one protrusion 128 can slide past the leaf spring 144 until the double-ring metal strain relief and shielding clip 100 is in the assembled state, i.e., the first ring 116 and the second ring 118 of the metal strip 104 are pulled together, such that the cable 108 is pressed against the arc of the conductive shielding plate 138 of the metal carrier 102 and secured to the metal carrier 102. When at least one protrusion 128 slides past the leaf spring 144, at least one protrusion 128 can push the leaf spring 144 downward. After at least one protrusion 128 has slid past the edge of the recess 146 of the leaf spring 144, at least one protrusion 128 inserts into the recess 146 of the leaf spring 144, so that the leaf spring 144 can spring back to its initial position. Therefore, with Figure 4 and Figure 5 Compared to the previous embodiment, the operation of the double-ring metal strain relief and shielding clamp 100 may be more convenient because the rewinder 106 remains fully positioned within the support 126 during rotation, and because the leaf spring 144 is more flexible than the flexible arm 142, the force exerted by at least one protrusion 128 pressing down on the leaf spring 144 during the rotation of the rewinder 106 may be less than... Figure 5 Examples of implementations.

[0079] When the first ring 116 and the second ring 118 are tightened, the rewinder 106 no longer rotates further, and the protrusion 128 that was finally pushed past the leaf spring 144 and entered the recess 146 of the leaf spring 144 may be blocked by the edge of the recess 146, thereby preventing the rewinder 106 from rotating. Therefore, in the assembled state of the double-ring metal strain relief and the shielding clamp 100, the rewinder 106 is fixed by the locking part 130.

[0080] By pulling the leaf spring 144 downward at the end of the leaf spring 144 that is not attached to the metal carrier 102, the cable 108 can be released from the double-ring metal strain relief and shielding clip 100. As a result, at least one of the plurality of protrusions 128 no longer engages with the leaf spring 144, and the metal strip 104 can be unwound from the rewinder 106 to release the cable 108 from the double-ring metal strain relief and shielding clip 100.

[0081] Figure 7 A schematic perspective view of a double-ring metal strain relief and shielding clip 100, including a locking portion 130 with a worm gear 158, is shown according to an embodiment. The worm gear 158 can be rotatably arranged on a metal carrier 102 about a rotation axis A of the worm gear 158. Figure 7 (Not shown in the image). The rewinder 106 and the worm gear 158 can be arranged perpendicular to each other and at a certain distance from each other.

[0082] A knob 162 may be arranged at one end of a worm gear 158, wherein the worm gear 158 can be rotated by turning the knob 162 in one or the other direction. The knob 162 may include an opening 164. The shape and configuration of the opening 164 of the knob 162 may correspond to the opening 136 at the front end of the rewinder 106. Therefore, the worm gear 158 can rotate together with the knob 162, for example, by hand or by using a tool through the opening 164 of the knob 162.

[0083] Multiple protrusions 128 can form gears 160 on the outer surface of the rewinder 106. At least one of the multiple protrusions 128 on the outer surface of the rewinder 106 can engage with a worm 158, particularly with the teeth 166 of the worm 158, such as... Figure 7 As shown.

[0084] By rotating the worm 158 in one direction or the other, the metal strip 104 can be wound onto and unwound from the rewinder 106. If the worm 158 does not rotate, the rewinder 106 can be locked by the worm 158. In particular, at least one protrusion 128 of the gear 160 can be locked by the teeth 166 of the worm 158. Therefore, when the first loop 116 and the second loop 118 of the metal strip 104 are tightened, the rewinder 106 no longer rotates further, and the rewinder 106 is prevented from turning back.

[0085] By rotating the worm gear 158 in the unwinding direction, the cable 108 can be released from the double-ring metal strain relief and shielding clamp 100. As a result, the rewinder 106 can be rotated in the unwinding direction, and the metal strip 104 can be unwound from the rewinder 106 to release the cable 108 from the double-ring metal strain relief and shielding clamp 100.

[0086] Figure 8 A schematic perspective view of a double-ring metal strain relief and shielding clip 100, including a mounting portion 132, according to an embodiment is shown. The mounting portion 132 can be attached to a metal carrier 102 or a portion thereof. The mounting portion 132 can be configured to secure the double-ring metal strain relief and shielding clip 100 to an electrical device 150, particularly to a fastener 148 of the electrical device 150. The fastener 148 of the electrical device 150 can be arranged at the bottom of the electrical device 150. Figure 8 In the illustrated embodiment, the fastener 148 may include two protrusions 152, and the mounting portion 132 may include two corresponding cavities 154. The cavities 154 may be arranged at corresponding arms of the mounting portion 132 and configured to receive the corresponding protrusion 152 when the double-ring metal strain relief and shielding clip 100 is attached to the fastener 148. The double-ring metal strain relief and shielding clip 100 is attached to the electrical device 150 by hooking one arm of the mounting portion 132 to the fastener 148, specifically to one of the two protrusions 152, and pushing the other arm of the mounting portion 132 upward until the other arm engages with the other of the two protrusions 152, i.e., the other protrusion 152 is fully received by the cavity 154 of the other arm. Thus, the metal carrier 102 of the double-ring metal strain relief and shielding clip 100 is clamped to the fastener 148 of the electrical device 150.

[0087] It should be understood that the double-ring metal strain relief and shielding clip 100 can be attached to the electrical device 150 using a mounting portion 132 including screws 134, as... Figure 1As shown and described. In this embodiment, the metal carrier 102 of the double-ring metal strain relief and shielding clip 100 is inserted into the fixing member 148 of the electrical device 150, and the mounting part 132 is screwed onto the electrical device 150 by screws 134, thereby fixing the double-ring metal strain relief and shielding clip 100 onto the electrical device 150.

[0088] Figure 9 A flowchart illustrating a method 200 for securing and shielding a cable to an electrical installation using a double-loop metal strain eliminator and shielding clip according to an embodiment is shown. At 202, the metal strip of the double-loop metal strain eliminator and shielding clip may be wound around the shielding braid of the cable to form a first loop. At 204, the metal strip may be wound around the first loop and the metal carrier of the double-loop metal strain eliminator and shielding clip to form a second loop. At 206, a rewinding machine may be used to wind the metal strip of the double-loop metal strain eliminator and shielding clip to shield the cable with the first loop of the metal strip and secure the cable to the metal carrier with the second loop of the metal strip.

[0089] It should be understood that the terms “first” and “second” or “one” and “another” are used only to distinguish different elements, not to limit the corresponding features.

[0090] In summary, the double-ring metal strain relief and shielding clamp uses metal strips to form a double-ring covering structure for the cable and its braided shield. When the metal strips are tightened into a ring, this double-ring structure functions similarly to a lifting pulley system, generating a large locking force to achieve stress relief without causing cable flattening or deformation. As a result, a combination of two functions is achieved in one step: 360° shielding contact and strain relief by pressing the cable against the conductive shielding plate.

[0091] List of reference numerals

[0092] 100 Double-Ring Metal Strain Relief and Shielding Clip

[0093] 102 Metal Carrier

[0094] 104 metal strip

[0095] 106 Rewinder

[0096] 108 cable

[0097] 110 strands

[0098] 112 Internal filling material

[0099] 114 Shielding Braid

[0100] 116 First Ring

[0101] 118 Second Ring

[0102] 120 gap

[0103] The first end of the 122 metal strip

[0104] The second end of the 124 metal strip

[0105] 126 support components

[0106] 128 protrusions

[0107] 130 Locked Part

[0108] 132 Installation Part

[0109] 134 screws

[0110] 136 opening

[0111] 138 conductive shielding plate

[0112] 140 nose

[0113] 142 arms

[0114] 144 leaf springs

[0115] 146 recess

[0116] 148 fasteners

[0117] 150 electrical installations

[0118] 152 protrusions

[0119] 154 chambers

[0120] 156 Fixed Part

[0121] 158 worm gear

[0122] 160 gears

[0123] 162 knobs

[0124] 164 opening

[0125] 166 teeth

[0126] 200 Method for securing cables to electrical installations and shielding cables

[0127] 202 Steps for wrapping metal strips around the cable's shielding braid

[0128] 204 Step of winding the metal strip around the first ring of the metal strip and the metal carrier

[0129] 206 Winded Metal Strip

[0130] A axis of rotation

Claims

1. A double-ring strain relief and shielding clamp for securing and shielding cables to electrical installations, comprising: carrier; The strips are constructed to form the first and second rings; and A rewinder is configured to wind the strip to shield the cable using a first loop of the strip and to secure the cable to the carrier using a second loop of the strip. The first loop of the strip surrounds the cable, and the second loop of the strip surrounds the cable and the fixed portion of the carrier.

2. The double-ring strain relief and shielding clip according to claim 1, in, The first end of the strip is attached to the carrier, and the second end of the strip is attached to the rewinder.

3. The double-ring strain relief and shielding clip according to claim 1, in, The first ring is configured to substantially surround the cable at a 360-degree angle.

4. The double-ring strain relief and shielding clip according to claim 1, in, The first loop of the strip is completely arranged within the second loop of the strip.

5. The double-ring strain relief and shielding clip according to claim 1, in, The second ring extends along at least two surfaces of the fixed portion.

6. The double-ring strain relief and shielding clip according to claim 2, in, The strip extends from the first end of the strip around the cable's shielding braid, around the fixed portion of the carrier, and back around the cable's shielding braid to the rewinder at the second end of the strip.

7. The double-ring strain relief and shielding clamp according to claim 1, in, The carrier includes a conductive shielding plate, and the rewinder is configured to press the cable onto the arc portion of the conductive shielding plate of the carrier using a second loop of the strip.

8. The double-ring strain relief and shielding clip according to claim 1, in, The carrier includes at least one support member configured to receive the rewinder. The at least one support member is formed as a half-shell.

9. The double-ring strain relief and shielding clip according to claim 1, The fixed portion of the carrier includes at least one arc portion.

10. The double-ring strain relief and shielding clip according to claim 1, in, The rewinder is removably arranged in the carrier.

11. The double-ring strain relief and shielding clip according to claim 1, further comprising: The locking part is configured to fix the rewinder in the assembled state of the double-ring strain relief and shielding clamp.

12. The double-ring strain relief and shielding clip according to claim 11, in, The rewinder includes a plurality of protrusions arranged on the outer surface of the rewinder, and In the assembled state of the double-ring strain relief and shielding clip, at least one of the plurality of protrusions engages with the locking portion.

13. The double-ring strain relief and shielding clip according to claim 1, further comprising: The mounting portion is located on the carrier and configured to fasten the double-ring strain relief and shielding clamp to the electrical device.

14. A method for securing and shielding a cable to an electrical device using a double-ring strain relief and shielding clamp according to claim 1, comprising: The strip is wrapped around the cable's shielding braid to form a first loop; The strip is wound around the first ring and the carrier to form a second ring; The rewinder is used to wind the strip to shield the cable using a first loop of the strip, and the second loop of the strip is used to secure the cable to the carrier. The first loop of the strip surrounds the cable, and the second loop of the strip surrounds the cable and the fixed portion of the carrier.

15. An electrical device comprising a fastener configured to receive a double-ring strain relief and shielding clip according to claim 1.

16. The double-ring strain relief and shielding clip according to claim 1, in, The strip is a metal strip.

17. The double-ring strain relief and shielding clip according to claim 8, in, The carrier includes two support members configured to receive the rewinder.

18. The double-ring strain relief and shielding clip according to claim 9, in, The fixed portion of the carrier includes a plurality of arcs configured to deflect the path of the strip.

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