Cable gland

Abstract

This cable gland provides a cable gland that ensures cable retention and dustproof / waterproof performance, and also provides a function to fix and hold a flexible conduit. [Solution] When the cable is inserted through the sleeve's insertion hole and the sleeve is fitted into the gland body, and the cap is tightened onto the male thread of the gland body, the sleeve is pressed into the gland body, causing it to deform radially inward on the conical tapered surface inside the gland body, and the inner surface of the sleeve's insertion hole and the outer surface of the cable to come into close contact. This prevents foreign matter (e.g., water, oil, dust, dirt, etc.) from entering the housing of the electrical equipment, securely holds and fixes the cable itself, and is characterized by having a structure that fixes and holds the flexible conduit to the extension cap.

Description

【Technical Field】 【0001】 The present invention relates to a cable gland having a function of holding an end portion of a flexible electric wire tube. 【Background Art】 【0002】 When laying cables indoors and outdoors, for the purpose of physically protecting the cables and preventing the spread of fire from the cables, etc., the cables are housed in a flexible electric wire tube in which concave and convex shapes are continuously formed in the tube axis direction. Also, in electrical equipment installed outdoors, a construction method of passing the cable through a flexible electric wire tube is adopted in order to protect the cable drawn out from the housing from direct sunlight, wind, snow, rain, and splashes of seawater, etc. 【0003】 Such flexible electric wire tubes often have a bellows structure in which annular convex portions and annular concave portions are alternately connected along the length direction, but there are also structures provided in a spiral shape. The annular convex portion has a flat top surface shape or a mountain shape, etc., and by providing such irregularities, it becomes flexible. Flexible electric wire tubes are also called corrugated tubes, corrugated pipes, corrugated tubes, etc. 【0004】 Flexible electric wire tubes are made of metal and synthetic resin. For metal ones, the dimensions, quality, and performance including the corrugated shape are specified (JIS standard: JISC8309). Those made of synthetic resin are called PF tubes and CD tubes, and the dimensions of the inner diameter and outer diameter, quality, and performance are specified, but there are no detailed regulations regarding the waveform (JIS standard: JISC8401). Regarding corrugated tubes for low-voltage applications, there is no standardization, and those with required performance are manufactured according to the user's requests. 【0005】 For materials made of synthetic resin, highly flexible plastic materials such as polypropylene (PP) and polyamide (PA) with enhanced flame resistance are often used. In addition, some flexible electrical conduits made of synthetic resin have slits formed in a continuous cut along the axial direction of the pipe to facilitate the application of covering to the cable after wiring. 【0006】 Furthermore, in electrical equipment mainly installed outdoors, cable glands are used to pull cables out from openings in the enclosure and to hold and secure the cables. A cable gland is a cylindrical member through which cables can be inserted and comprises a gland body that is attached to a wall such as an enclosure, a sleeve that fits into the gland body, and a cap (cap nut) that is screwed onto the outside of the gland body. The cap includes a cylindrical peripheral wall and a front wall formed at one end of the peripheral wall, with an opening formed in the front wall through which the cable is inserted. 【0007】 The process of holding a cable using this cable gland is performed as follows: The male thread on the other end of the gland body is inserted into an opening formed in the wall of the electrical equipment housing, and the gland body is attached to the wall by screwing a lock nut onto the male thread on the other end. After that, the cable is inserted through the sleeve's insertion hole, and the sleeve is fitted onto the gland body. When the cap is tightened onto the male thread of the cable holding part of the gland body, the sleeve is pressed into the gland body, causing the sleeve to deform radially inward on the conical tapered surface inside the gland body, and the inner surface of the sleeve's insertion hole and the outer surface of the cable to come into close contact. This prevents foreign matter (e.g., water, oil, dust, dirt, etc.) from entering the electrical equipment housing and securely holds and fixes the cable itself. 【0008】 Furthermore, a configuration for fixing a cable and connecting a corrugated tube is also disclosed. Specifically, a cylindrical connector is disclosed, comprising: a first threaded portion that screws into a threaded portion on one end of the seal connector body, which houses a seal member having one or more through holes for inserting a cable; an insertion portion on the other end into which a corrugated tube can be inserted; a plurality of engaging claws that can engage with the valleys on the outer surface of the corrugated tube inserted into the insertion portion from the other end; a pressing portion that presses the peripheral edge of the seal member housed in the seal connector body when the first threaded portion and the threaded portion of the seal connector body are screwed together; and one or more drainage holes that connect the space between the first threaded portion and the insertion portion to the outer surface. 【0009】 One end of this connector has a configuration that functions as a tightening nut for a sealed connector (a cable fixing device whose main components are a sealed connector body, a sealing member, and a tightening nut). The other end has a configuration to which a corrugated tube connector can be attached. Therefore, it is described that a cable inserted through the sealed connector can be neatly housed inside the corrugated tube while maintaining the waterproofness of the sealed connector (see, for example, Patent Document 1). 【0010】 Furthermore, a cable sealing connector used to prevent leakage (seal) when inserting a cable into an insertion hole formed in equipment is disclosed (see, for example, Patent Document 2). 【0011】 Furthermore, a conduit connector for connecting flexible conduits made of synthetic resin, mainly used in indoor and outdoor wiring work, is also disclosed, which allows the flexible conduits to be connected or disconnected with a single touch (see, for example, Patent Document 3). [Prior art documents] [Patent Documents] 【0012】 [Patent Document 1] Patent No. 6398711 [Patent Document 2] Japanese Patent Publication No. 2004-180352 [Patent Document 3] Japanese Patent Publication No. 2012-223010 [Overview of the Initiative] [Problems that the invention aims to solve] 【0013】 The invention described in Patent Document 1 involves inserting a cable through the seal connector body, screwing it in with the connector to reduce the diameter of the sealing member and seal it, then attaching a corrugated tube connecting component to the connector, inserting a corrugated tube into the corrugated tube connecting component, and fitting the engaging claws of the connector into the recesses of the corrugated tube to secure it. The invention described in Patent Document 2 does not have a structure for attaching a flexible conduit to protect the cable, and there is neither disclosure nor suggestion regarding the attachment of a flexible conduit. The invention described in Patent Document 3 has a complex structure for the conduit connector in order to enable the flexible conduit to be connected or disconnected with a single touch. The present invention aims to provide a cable gland that can fix and hold a flexible conduit while ensuring cable retention force and dustproof and waterproof performance. [Means for solving the problem] 【0014】 To solve the above-mentioned conventional problems, the cable gland of the present invention is characterized by comprising a gland body that is attached to a wall such as an enclosure, a sleeve that is fitted into the gland body, an extension cap that is screwed onto the outside of the gland body, and a flexible conduit connection part that is fitted into the extension cap and securely holds the flexible conduit with an engaging part, and connects and secures it. 【0015】 With this configuration, the gland body is inserted into an opening in the housing of the electrical equipment, secured with a lock nut, and with the cable inserted through the sleeve's insertion hole, the sleeve is fitted into the gland body. When the extension cap is tightened onto the male thread of the gland body, the sleeve is pressed into the gland body, causing it to deform radially inward on the conical tapered surface inside the gland body, and the inner surface of the sleeve's insertion hole and the outer surface of the cable to come into close contact. This prevents foreign matter (such as water, oil, dust, etc.) from entering the housing of the electrical equipment, and also securely holds and fixes the cable itself. 【0016】 Furthermore, in this invention, the engaging portion is inserted into the recess of the flexible conduit using a locking piece, and then fitted into the fitting portion by inserting it into the extension cap and rotating it by approximately 1 / 20th of a turn, allowing the end of the flexible conduit to be easily connected to the extension cap. 【0017】 In the above configuration, a rotatable washer may be further provided between the sleeve and the extension cap. By providing the washer, damage to the sleeve can be prevented when tightening the extension cap, thus preventing the dustproof and waterproof performance from being compromised. 【0018】 In the above configuration, the extension cap has a nut portion with a female thread formed on the inner surface of one end, and a fitting portion for a locking piece and an insertion portion for a flexible conduit provided on the opposite side of the nut portion. The locking piece has an annular portion having an outer diameter that fits into the fitting portion, a flange-like portion provided at the end of the annular portion and having a larger outer diameter than the annular portion, at least two engaging portions provided on the inner circumferential surface of the annular portion, and the annular portion and flange-like portion are provided with a notch cut out along the axial direction and a thin-walled portion that facilitates widening the notch when passing the flexible conduit through, and the engaging portion may be sandwiched in the recess of the flexible conduit, and the annular portion may be fitted into the fitting portion of the extension cap. 【0019】 With such a configuration, after the extension cap and the cable holding part press the sleeve to hold and fix the cable, the engaging part of the locking piece is further inserted into the recess of the flexible conduit, and then inserted into the extension cap in a state where it is sandwiched between the recesses of the flexible conduit. If the annular part is fitted into the fitting part of the extension cap, a cable ground having a configuration for connecting the end of the flexible conduit can be obtained. 【0020】 Note that since the locking piece is provided with a notch, if a force is applied to widen this notch and then the engaging part is sandwiched between the recesses of the flexible conduit, the flexible conduit can be easily fixed and held. Also, when fitting the annular part into the fitting part, it can be easily fitted by inserting the annular part with the notch in its original state or by applying a force to narrow the notch. 【0021】 Note that by selecting a locking piece adapted to the pipe diameter and waveform of a corrugated pipe, a corrugated tube, a corrugated pipe or a corrugated tube, various waveforms of flexible conduits can be connected within the range allowed by the inner diameter of the inner insertion part of the flexible conduit. 【0022】 Also, it is desirable that a plurality of flat portions for screw tightening are formed on the outer peripheral surface of the nut portion. Thereby, a wrench or the like can be used when tightening or removing. Generally, hexagon bolts and hexagon nuts are commercially available, so a hexagonal shape is preferable, but an octagonal shape may also be used. 【0023】 In the above configuration, at least two groove portions may be provided on the inner surface of the fitting portion of the extension cap, a protrusion portion may be provided at a position corresponding to the groove portion on the outer surface of the annular portion of the locking piece, and the groove portion and the protrusion portion may be configured to be fitted. With such a configuration, the fitting between the fitting portion and the annular portion can be made more reliable, and it can be made difficult to drop even when vibrations, impacts, etc. are applied. In the above configuration, the flange portion of the locking piece is provided with a thin-walled portion in which a region set in advance centering on the position facing the notch portion is cut out. 【0024】 This configuration allows the thin-walled section to deform easily when force is applied, making it possible to easily widen or narrow the notch with a small amount of force. Therefore, the work can be easily performed by widening the notch when inserting the engaging section into the recess of the flexible conduit, and narrowing it when fitting the annular section of the locking piece into the mating section. In the above configuration, the end of the extension cap where the female thread is formed is provided with at least one water pressure relief hole that penetrates from the outer surface to the inner surface. 【0025】 In the case of flexible conduits made of synthetic resin, some installers may use flexible conduits with slits. When used outdoors, the conduit may be damaged by impacts from flying objects, gnawed on by birds or animals, or punctured by insects such as cicadas to lay eggs. If the flexible conduit is installed stretched vertically higher than the electrical equipment, water may accumulate inside the conduit due to rain or seawater splashes. If water enters the flexible conduit at a height of more than 1 meter above the cable gland mounting position, water pressure exceeding the waterproof protection performance (JIS C0920) IPX7 will act on the cable holding part. When such water pressure acts, there is a risk that water will enter the inside of the housing from between the cable and the sleeve. To prevent this, it is necessary to provide water pressure relief holes. 【0026】 The extension cap and locking piece can be formed by injection molding using a resin material. While thermoplastic resins are preferred as they can be injection molded, thermosetting resins can also be used. Examples of thermoplastic resins include polypropylene (PP), polyamide (PA6, PA66), polyphenylene sulfide (PPS), polycarbonate (PC), acrylonitrile butadiene styrene (ABS), and fiber-reinforced resins obtained by adding glass fibers to these resins. These resin materials can be manufactured using known manufacturing methods such as injection molding. It is preferable to use a resin material that is easily elastically deformable for the locking piece. Furthermore, the materials are not limited to resins; metal components may also be used. Examples of metal components include aluminum, brass, and stainless steel, which may be processed to form the locking piece. Furthermore, the JIS standard: JIS C0920 is used for determining the protection level (IP code) provided by the enclosure of electrical machinery and equipment. [Effects of the Invention] 【0027】 This invention makes it easier to fix flexible conduits and is highly effective in the field of fixing cables for various machines and other equipment installed in harsh environments. [Brief explanation of the drawing] 【0028】 [Figure 1] This is a perspective view showing the arrangement of components of the cable gland according to this embodiment. [Figure 2] This is a perspective view showing a state in which a cable and a flexible conduit are fixed and connected using the cable gland according to this embodiment. [Figure 3] This is a perspective view showing the extension cap and locking piece, which constitute the flexible conduit connection section, connected together. [Figure 4] The diagram shows the extension cap; (a) is a perspective view from the fitting side, and (b) is a perspective view from the nut side. [Figure 5]The diagram shows the locking piece, with (a) being a view of the flange side from the axial direction, (b) being a view from the side, and (c) being a perspective view from the flange side. [Figure 6] This is a perspective view showing the state after inserting a packing into the mounting part of the ground unit into the opening of the electrical equipment, and then securing it from the inside of the electrical equipment with a lock nut. [Figure 7] This perspective view shows the extension cap with the nut screwed into the cable holder, securing and tightening the cable. [Figure 8] This is a perspective view showing the locking piece's engaging portion sandwiched in the recess of the flexible conduit. [Figure 9] The diagram shows the flexible conduit being held in place, with the annular portion of the locking piece inserted into the fitting portion of the extension cap, and the groove and projection fitting together to secure the flexible conduit. (a) is a perspective view, and (b) is a cross-sectional view taken along the axial direction. [Modes for carrying out the invention] 【0029】 (Embodiment) 【0030】 The cable gland 1 according to an embodiment of the present invention will be described in detail below. Figure 1 is a perspective view showing the arrangement of the components of the cable gland 1 according to this embodiment. Figure 2 is a perspective view showing the state in which the cable 50 and the flexible conduit 60 are fixed and connected using the cable gland 1 according to this embodiment. Note that electrical equipment is not shown in Figure 2. Figure 3 is a perspective view showing the state in which the extension cap 20 and the locking piece 30 constituting the flexible conduit connection part 10 are connected. Figure 4 is a diagram showing the extension cap 20, where (a) is a perspective view from the fitting part 26 side and (b) is a perspective view from the nut part 21 side. Figure 5 is a diagram showing the locking piece 30, where (a) is a view from the axial direction of the flange-shaped part 32 side, (b) is a view from the side and (c) is a perspective view from the flange-shaped part 32 side. The configuration of the cable gland 1 according to an embodiment of the present invention will be described using these drawings. 【0031】 As can be seen from Figures 1 and 2, the cable gland 1 of the present invention comprises a gland body 40 which is cylindrical in shape through which a cable 50 can be inserted and has a flange portion 41 and cable holding portions 42 and mounting portions 43 provided on both sides of the flange portion 41, with male threads formed on the outer circumference of each; a sleeve 44 which has an insertion hole for passing the cable 50 and is fitted into the cable holding portion 42; a lock nut 46 which has a female thread that engages with the male thread of the mounting portion 43; and a flexible conduit connection portion 10 which consists of an extension cap 20 which has a structure that screws into the male thread of the cable holding portion 42 and into which a flexible conduit 60 is inserted at the other end, and a locking piece 30 which fixes and holds the flexible conduit 60 by an engaging portion 37 and fits into the extension cap 20 for connection. 【0032】 In this embodiment, a washer 47 is further provided, which is rotatably interposed between the sleeve 44 and the extension cap 20. By providing the washer 47, damage to the sleeve 44 can be prevented when tightening with the extension cap 20. However, the washer 47 is not necessarily required. 【0033】 The sleeve 44 has a through-hole for the cable 50, is inserted into the cable holding portion 42, and is a cylindrical shape with elasticity. The sleeve 44 has a diameter that decreases toward the gland body 40 side, and appears trapezoidal when viewed from the side. The inner surface of the cable holding portion 42 is shaped to match this trapezoidal shape. In this embodiment, the sleeve 44 has only one through-hole, but if multiple cables are to be inserted, the sleeve 44 may have a number of through-holes corresponding to the number of cables. 【0034】 The lock nut 46 has a female thread that screws onto the male thread of the mounting portion 43. After inserting the mounting portion 43 of the gland body 40 into an opening provided in the housing of the electrical equipment, it is used for screw fastening from the inside of the housing. A packing 45 is also provided for this purpose. The packing 45 is made of rubber, for example, and is elastically deformable, sealing the gap in the opening of the electrical equipment. The sleeve 44 is also made of rubber, for example, and is elastically deformable, and deforms when the nut portion 21 of the extension cap 20 is screwed in, pressing the cable 50 from all sides and providing a tight seal to give it waterproofness. 【0035】 The flexible conduit 60 covers and protects the outer circumference of the cable 50, and its surface is provided with irregularities, in which the engaging portion 37 of the locking piece 30 is sandwiched and fixed in place by the recesses 60a. 【0036】 The extension cap 20 has a nut portion 21 which is provided with a female thread 23 that screws onto the male thread of the cable holding portion 42. The gland body 40 is configured such that its mounting portion 43 is inserted into an opening provided in the housing of the electrical equipment and secured by a lock nut 46 via a packing 45. 【0037】 The cable 50 inserted into the main body 40 of the ground is secured tightly by screwing the nut portion 21 of the extension cap 20 onto the cable holding portion 42, thereby deforming the sleeve 44 and securing it tightly. In this case, as shown in Figure 1, a rotatably positioned washer 47 is interposed between the sleeve 44 and the extension cap 20. With the washer 47 in place, when the extension cap 20 is screwed onto the cable holding portion 42, the washer 47 slides against the extension cap 20 while pressing against the sleeve 44. As a result, the sleeve 44 is not rubbed and damaged by the extension cap 20. 【0038】 Next, the structure of the flexible conduit connection part 10 will be described. The extension cap 20 has a nut part 21 with a female thread 23 formed on the inner surface of one end, an insertion part 25 provided on the opposite side of the nut part 21 for inserting the flexible conduit 60, and a fitting part 26 for fitting the locking piece 30. The locking piece 30 has an annular part 31 having an outer diameter that fits into the fitting part 26, a flange-shaped part 32 provided at the end of the annular part 31 and having a larger outer diameter than the annular part 31, at least two engaging parts 37 provided on the inner circumferential surface of the annular part 31, and notches 34 cut out along the axial direction in the annular part 31 and the flange-shaped part 32. The engaging parts 37 are sandwiched in the recess 60a of the flexible conduit 60, and the annular part 31 is fitted into the fitting part 26 of the extension cap 20. 【0039】 In this embodiment, as shown in Figure 5, the engaging portion 37 is provided in a shape that protrudes from the inner circumferential surface toward the center at opposing positions, forming a roughly 1 / 4 circumference. Since this engaging portion 37 is sandwiched in the recess 60a of the flexible conduit 60, the flexible conduit 60 can be securely fixed. 【0040】 Since the locking piece 30 is provided with a notch 34, by applying force to widen the notch 34 and then inserting the engaging portion 37 into the recess 60a of the flexible conduit 60, it can be easily and securely fitted. When fitting the annular portion 31 into the fitting portion 26, it can be easily fitted by returning the notch 34 to its original state or by applying force to narrow the notch 34 and inserting it into the annular portion 26. 【0041】 Multiple flat portions 22 for screw tightening are formed on the outer circumferential surface of the nut portion 21. In this embodiment, six flat portions 22 are formed, and the screw is tightened by applying a wrench to these flat portions 22. In this embodiment, an insertion portion 25 is provided that connects the nut portion 21 and the fitting portion 26 of the extension cap 20. The inner surface of the boundary between this insertion portion 25 and the nut portion 21 is cone-shaped 24 to match the shape of the sleeve. The insertion portion 25 is provided with at least one water pressure relief hole 28 that penetrates from the outer surface to the inner surface. 【0042】 Furthermore, in this embodiment, the inner surface of the fitting portion 26 of the extension cap 20 is provided with two grooves 27 at opposing positions. The outer surface of the annular portion 31 of the locking piece 30 is provided with a projection 35 at a position corresponding to the grooves 27. The grooves 27 and projection 35 are shaped to interlock. This makes the fitting between the fitting portion 26 and the annular portion 31 more secure and less likely to come loose, and makes it less likely to come off even when subjected to vibration or shock. 【0043】 As shown in Figure 4, the groove 27 is formed from the tip of the fitting portion 26, extends in the direction of the insertion portion 25, and is then formed toward the circumferential direction of the fitting portion 26. Furthermore, a protruding portion 27a is provided on a part of the groove 27 in the circumferential direction. On the other hand, the projection 35 has a shape that matches the width of the groove 27 in the circumferential direction, and a recessed portion 35a is provided in the center of the projection 35. When the projection 35 is inserted into the tip of the groove 27 and pushed in and then rotated in the circumferential direction, the protruding portion 27a of the groove 27 fits into the recessed portion 35a of the projection 35 and is fixed in place. This configuration allows for stable fixing of the extension cap 20 and the locking piece 30. 【0044】 Thus, even with the protruding portion 27a and the recessed portion 35a provided, the locking piece 30 is provided with a notch 34 and a thin-walled portion 36, so even when fitted into the fitting portion 26, the locking piece 30 can deform so that it shrinks by about the width of the notch 34. 【0045】 In this embodiment, a protruding portion 27a is provided in the groove 27 and a recessed portion 35a is provided in the center of the projection 35 to allow for fitting, but the present invention is not limited to this configuration. A recessed portion may be provided in the groove 27 and a protruding portion may be provided in the projection 35, or fitting can be achieved without providing such a protruding portion 27a and recessed portion 35a. In other words, as long as the annular portion 31 is inserted into the fitting portion 26 and the fitting portion 26 and the annular portion 31 can be fixed together, various commonly used configurations may be used. Furthermore, in this embodiment, two grooves 27 are provided at opposing positions, but three or four may be provided. Accordingly, three or four protrusions 35 may also be provided. 【0046】 Furthermore, in this embodiment, the flange portion 32 of the locking piece 30 is provided with a thin-walled portion 36, which is a predetermined area cut out centered on the position opposite the notch portion 34. By providing the thin-walled portion 36 in this way, the notch portion can be easily widened or narrowed by applying a small force, making it easier to insert and fix the flexible conduit 60. Next, we will describe how to use the cable gland 1 according to this embodiment to fix electrical equipment, fix cables, and fix flexible conduits. 【0047】 Figure 6 is a perspective view showing the state after inserting the packing 45 into the mounting portion 43 of the gland body 40 into the opening (not shown) of the electrical equipment 70, and then securing it from the inside of the electrical equipment 70 with a lock nut (not shown). The cable 50 is pulled out from the gland body 40. In this state, the cable 50 is not yet secured. 【0048】 Figure 7 is a perspective view showing the state in which the cable 50 is tightened and secured by screwing the nut portion 21 of the extension cap 20 into the cable holding portion 42. Although not shown in the figure, a sleeve 44 and a washer 47 are located inside the cable holding portion 42 and the nut portion 21. When the screw is tightened, the sleeve 44 deforms and presses against the cable 50, securing the cable 50 tightly. 【0049】 Figure 8 is a perspective view showing the locking piece 30 with its engaging portion 37 clamped into the recess 60a of the flexible conduit 60. Since the locking piece 30 is circular, when clamping the engaging portion 37 into the recess 60a of the flexible conduit 60, force is applied to slightly open the notch 34 to make it easier to insert and clamp the flexible conduit 60. After clamping, the piece returns to its original circular shape when the applied force is removed, but the clamped state is maintained. The flexible conduit 60 is inserted until it is close to the water pressure relief hole 28 of the extension cap 20. 【0050】 Figure 9 shows the state in which the flexible conduit 60 is sandwiched, the annular portion 31 of the locking piece 30 is inserted into the fitting portion 26 of the extension cap 20, and the groove portion 27 and projection portion 35 are fitted together to fix the flexible conduit 60. (a) is a perspective view, and (b) is a cross-sectional view taken along the axial direction. 【0051】 When inserting the annular portion 31 into the fitting portion 26, you may apply force to further close the notch 34. This will slightly reduce the outer diameter of the locking piece 30, making insertion easier. However, it is not essential to apply force to close the notch 34. If the outer diameter of the annular portion 31 can be inserted into the inner diameter of the fitting portion 26, it may be inserted as is. As shown in Figure 5, the locking piece 30 has a convex portion 33 on the outer circumference of the annular portion 32, so the work can be easily done by grasping this convex portion 33 during insertion. 【0052】 As described above, the cable gland 1 of the present invention secures the cable 50 by screwing the nut portion 21 of the extension cap 20 to the cable holding portion 42. The flexible conduit 60 is secured by inserting the engaging portion 37 of the locking piece 30 into the recess 60a of the flexible conduit 60, then inserting the annular portion 31 into the fitting portion 26, and engaging the groove portion 27 and the projection portion 35. When removing the flexible conduit 60, it can be easily removed by rotating the locking piece 30 in the reverse direction to disengage the projection portion 35 from the groove portion 27. [Industrial applicability] 【0053】 The cable gland of the present invention provides a waterproof function when fixing cables to equipment, facilitates the retention of flexible conduit for protecting cables exposed to the outside, and is useful in various fields of electrical equipment where cables are connected to electrical devices. [Explanation of symbols] 【0054】 1 Cable gland 10 Flexible conduit connection 20 Extension caps 21 Nut section 22 Flat area 23 Female thread 24 Cone shape 25 Interpolation part 26 Fitting part 27 Groove 27a Projection 28 Water pressure relief holes 30 Rocking Pieces 31 Annular section 32 Flange 33 Convex part 34 Notch 35 Protrusion 35a Recess 36 Thin-walled section 37 Engaging part 40 Grand Main Unit 41 Guard section 42 Cable holding section 43 Mounting part 44 sleeves 45 Packing 46 Lock Nuts 47 Washer 50 Cables 60 Flexible conduit 60a recess 70 Electrical equipment

Claims

[Claim 1] The gland body has a cylindrical shape through which a cable can be inserted, and has a flange portion and cable holding portions and mounting portions provided on both sides of the flange portion, with male threads formed on the outer surface of each portion. A sleeve having a through-hole for the cable and fitted into the cable holding portion, A lock nut having a female thread that engages with the male thread of the mounting portion, A cable gland characterized by comprising an extension cap that screws into the male screw of the cable holding portion and into which a flexible conduit is inserted, and a flexible conduit connection portion which consists of a locking piece that fixes and holds the flexible conduit by an engaging portion and fits into the extension cap for connection. [Claim 2] The cable gland according to claim 1, further characterized in that a washer is rotatably interposed between the sleeve and the extension cap. [Claim 3] The extension cap has a nut portion with a female thread formed on the inner surface of one end, an insertion portion on the opposite side of the nut portion into which the flexible conduit is inserted, and a fitting portion into which the locking piece is fitted. The locking piece comprises an annular portion having an outer diameter that fits into the fitting portion, a flange-like portion provided at the end of the annular portion and having a larger outer diameter than the annular portion, at least two engaging portions provided on the inner circumferential surface of the annular portion, and notches cut out along the axial direction in the annular portion and the flange-like portion. The cable gland according to claim 1, characterized in that the engaging portion is sandwiched in the recess of the flexible conduit, and the annular portion is fitted into the fitting portion of the extension cap. [Claim 4] At least two grooves are provided on the inner surface of the fitting portion of the extension cap. A projection is provided on the outer surface of the annular portion of the locking piece at a position corresponding to the groove. The cable gland according to claim 3, characterized in that the groove and the projection are interlocked. [Claim 5] The cable gland according to claim 3, characterized in that the flange-shaped portion of the locking piece has a thin-walled portion in a predetermined area centered on the position opposite the notch. [Claim 6] The cable gland according to any one of claims 1 to 5, characterized in that the inner diameter of the locking piece and the shape of the engaging portion are set to match various outer diameters and irregular shapes of the flexible conduit, and various flexible conduits can be connected by selecting the locking piece.

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