Cable glands

Abstract

To provide a cable gland that can secure cable holding force and dustproof and waterproof performance and that is endowed with the function of fixing and holding a flexible electric conduit. [Solution] When a cable is inserted into the sleeve's insertion hole and the sleeve is fitted into the gland body, and the cap is then tightened onto the gland body's male thread, the sleeve is pressed into the gland body, causing the conical tapered surface inside the gland body to deform the sleeve radially inward, bringing the inner circumferential surface of the sleeve's insertion hole into tight contact with the outer circumferential surface of the cable. This prevents foreign matter (such as water, oil, dust, and dirt) from entering the housing of the electrical equipment, and firmly holds and fixes the cable itself. The extension cap is also characterized by its structure for fixing and holding a flexible conduit.

Description

[Technical Field]

[0001] The present invention relates to a cable gland having the function of retaining the end of a flexible electrical conduit. [Background technology]

[0002] When laying cables indoors or outdoors, the cables are housed in flexible conduits with a continuous uneven surface formed in the axial direction of the conduit for the purposes of physical protection of the cables and preventing the spread of fire from the cables. Also, for electrical equipment installed outdoors, a construction method is used in which cables are passed through flexible conduits to protect the cables pulled out from the housing from direct sunlight, wind, snow, rainwater, seawater spray, etc.

[0003] Such flexible conduit often has a bellows structure with alternating annular convex and concave sections along its length, but some have a spiral structure. The annular convex sections can have flat or mountain-shaped tops, and providing these convex and concave sections gives the conduit flexibility. Flexible conduit is also known as corrugated pipe, corrugated tube, corrugated pipe, or corrugated tube.

[0004] Flexible conduits are available in metal and synthetic resin, and the dimensions, quality, and performance of metal conduits, including the corrugated shape, are specified (JIS standard: JISC8309).Synthetic resin conduits are called PF pipes or CD pipes, and while the dimensions of the inner and outer diameters, quality, and performance are specified, there are no detailed specifications for the corrugation (JIS standard: JISC8401). There is no standardization for corrugated tubes for low voltage applications, and tubes with the required performance are manufactured according to the user's requirements.

[0005] Synthetic resin conduits are often made of highly flexible plastic materials such as polypropylene (PP) or polyamide (PA) with enhanced flame resistance. Some flexible conduits made of synthetic resin have continuous slits cut along the axial direction of the conduit to make it easier to cover the cables after wiring.

[0006] Furthermore, in electrical equipment that is mainly installed outdoors, cable glands are used to hold and secure cables that are pulled out from openings in the housing. A cable gland is a cylindrical member through which a cable can be inserted, and includes a gland body that is attached to the wall of the housing or the like, a sleeve that is fitted 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, and an opening through which the cable is inserted is formed in the front wall.

[0007] The cable gland is used to hold a cable as follows: The male thread on the other side of the gland body is inserted into an opening in the wall of the electrical equipment housing, and a lock nut is screwed onto the male thread on the other side to attach the gland body to the wall. Then, with the cable inserted through the sleeve's insertion hole, the sleeve is fitted into the gland body, and a cap is tightened onto the male thread on the cable-holding portion of the gland body. The sleeve is pressed into the gland body, causing the conical tapered surface inside the gland body to deform radially inward, bringing the inner surface of the sleeve's insertion hole into tight contact with the outer surface of the cable. This prevents foreign matter (e.g., water, oil, dust, etc.) from entering the electrical equipment housing and securely holds and secures the cable itself.

[0008] Also disclosed is a configuration for fixing a cable and connecting a corrugated pipe. Specifically, the disclosed connector includes a cylindrical connector having a first screw portion provided at one end and threadedly engaging with a screw portion on the side of the seal connector main body that houses a seal member having one or more through holes for inserting a cable therethrough, an insertion portion provided at the other end into which the corrugated pipe can be inserted, a plurality of engaging claws that can engage with valleys on the outer surface of the corrugated pipe inserted into the insertion portion from the other end side, a pressing portion that presses the peripheral edge of the seal member housed in the seal connector main body when the first screw portion is threadedly engaged with the screw portion of the seal connector main body, and one or more drainage holes that communicate between the first screw portion and the insertion portion and the outer surface.

[0009] One end of this connector is configured to function as a clamping nut for a seal connector (a cable fastener whose main components are a seal connector body, a seal member, and a clamping nut), and the other end is configured to allow a corrugated pipe connector to be attached. It is described that a cable inserted into the seal connector can be accommodated in a corrugated pipe in an aesthetically pleasing manner while maintaining the waterproofness of the seal connector (see, for example, Patent Document 1).

[0010] Also, a cable seal connector that is used to prevent leakage (seal) when a cable is inserted into an insertion hole formed in a device has been disclosed (see, for example, Patent Document 2).

[0011] Furthermore, a conduit connector for connecting flexible conduit made of synthetic resin, which is mainly used for indoor and outdoor wiring construction, and which can connect or disconnect this flexible conduit with a single touch, has also been disclosed (see, for example, Patent Document 3). [Prior art documents] [Patent documents]

[0012] [Patent Document 1] Patent No. 6398711 [Patent Document 2] JP 2004-180352 A [Patent Document 3] Patent Publication No. 2012-223010 Summary of the Invention [Problem to be solved by the invention]

[0013] In the invention described in Patent Document 1, a cable inserted into a seal connector body is screwed in place with the connector, the sealing member is reduced in diameter to form a seal, and then a corrugated pipe connecting part is attached to the connector, a corrugated pipe is inserted into the corrugated pipe connecting part, and the connector's engaging claws are fitted into the recesses of the corrugated pipe to secure them in place. The invention described in Patent Document 2 does not have a structure for attaching a flexible conduit to protect the cable, and does not disclose or suggest the attachment of a flexible conduit. The invention described in Patent Document 3 has a complicated structure for the conduit connector in order to enable one-touch connection and disconnection of flexible conduits. An object of the present invention is to provide a cable gland that can securely hold a flexible conduit while ensuring cable holding force and dustproof and waterproof performance. [Means for solving the problem]

[0014] In order to solve the above-mentioned problems of the conventional cable gland, the cable gland of the present invention is characterized by comprising a flexible conduit connection part which includes a gland body attached to a wall of an enclosure or the like, a sleeve fitted into the gland body, an extension cap screwed onto the outside of the gland body, and a locking piece which holds the flexible conduit in place with an engaging part and fits into the extension cap to connect and fix the flexible conduit.

[0015] With this configuration, when the gland body is inserted into an opening in the housing of an electrical device and secured with a lock nut, the sleeve is fitted into the gland body with the cable inserted through the sleeve's insertion hole, and the extension cap is then tightened onto the male threads of the gland body, the sleeve is pressed into the gland body, causing the conical tapered surface of the gland body to deform the sleeve radially inward, bringing the inner circumferential surface of the sleeve's insertion hole into tight contact with the outer circumferential surface of the cable. This prevents foreign matter (e.g., water, oil, dust, etc.) from entering the housing of the electrical device and securely holds and secures the cable itself.

[0016] Furthermore, in the present invention, the engaging portion is clamped into the recess of the flexible electrical conduit using the locking piece, and then inserted into the extension cap and rotated approximately 1 / 20 of a turn to engage with the mating portion, making it possible to easily connect the end of the flexible electrical conduit 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 when tightening the extension cap can be prevented, and the dustproof and waterproof performance can be prevented from being impaired.

[0018] In the above configuration, the extension cap has a nut portion having a female thread formed on the inner surface of one end, an insertion portion for the flexible electrical conduit provided on the opposite side of the nut portion, and an engaging portion for the locking piece, and the locking piece has a ring portion having an outer diameter that fits into the engaging portion, a flange-shaped portion provided at the end of the ring portion and having an outer diameter larger than that of the ring portion, at least two engaging portions provided on the inner surface of the ring portion, and the ring portion and the flange-shaped portion are provided with a notch cut out along the axial direction and a thin-walled portion that makes it easy to widen the notch when the flexible electrical conduit is passed through, and the engaging portion may be configured to be sandwiched in a recess of the flexible electrical conduit, and the ring portion is engaged with the engaging portion of the extension cap.

[0019] With this configuration, the extension cap and the cable holding portion press the sleeve together to hold and secure the cable, and then the extension cap is inserted with the engaging portion of the locking piece sandwiched in the recess of the flexible conduit, and the annular portion is fitted into the fitting portion of the extension cap to obtain a cable gland configured to connect the end of the flexible conduit.

[0020] The locking piece has a notch, so by applying force to widen the notch and then clamping the engaging part into the recess of the flexible conduit, the flexible conduit can be easily fixed and held in place. When fitting the annular part into the fitting part, the notch can be inserted into the annular part with force applied to the original state or to narrow the notch, allowing for easy fitting.

[0021] Furthermore, by selecting a locking piece that is suited to the diameter and waveform of the corrugated pipe, corrugated pipe, or corrugated tube, flexible electrical conduits of various corrugations can be connected within the allowable range of the inner diameter of the flexible electrical conduit insertion section.

[0022] It is also desirable to form a number of flats on the outer surface of the nut for tightening the screw, so that a wrench or similar tool can be used for tightening and removing the screw. A hexagonal shape is preferred because hexagonal bolts and hexagonal nuts are generally available commercially, but an octagonal shape is also acceptable.

[0023] In the above configuration, at least two grooves may be provided on the inner surface of the fitting portion of the extension cap, and protrusions may be provided on the outer surface of the annular portion of the locking piece at positions corresponding to the grooves, and the grooves and protrusions may be configured to fit together. With this configuration, the fitting portion and the annular portion can be fitted together more reliably, and the fitting portion is less likely to come off even when subjected to vibrations, shocks, or the like. In the above-described configuration, the flange portion of the locking piece is provided with a thin-walled portion formed by cutting out a predetermined area centered at a position facing the notch portion.

[0024] With this configuration, the thin-walled portion easily deforms when force is applied, so the cutout portion can be easily widened or narrowed by applying a small force. Therefore, by widening the cutout portion when clamping the engaging portion into the recess of the flexible electrical conduit, and narrowing it when fitting the annular portion of the locking piece into the fitting portion, the work can be simplified. In the above configuration, the end of the extension cap on which 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] When installing flexible conduit made of synthetic resin, some installers use flexible conduit with slits. In outdoor use, the conduit can be damaged by flying objects, gnawed by birds and animals, or drilled by insects such as cicadas to lay eggs. When flexible conduit is installed vertically higher than the electrical equipment, rain or seawater splashes can cause water to accumulate inside the conduit. If water penetrates the flexible conduit more than 1 m above the cable gland installation position, water pressure exceeding the IPX7 waterproof protection rating (JIS C0920) acts on the cable support. This water pressure can cause water to seep into the housing through the gap between the cable and the sleeve. To prevent this, a water pressure relief hole is required.

[0026] The extension cap and locking piece can be formed by injection molding using a resin material. Thermoplastic resin is preferable as the resin material because it can be injection molded, but thermosetting resin can also be used. Examples of thermoplastic resin materials include polypropylene (PP), polyamide (PA6, PA66), polyphenylene sulfide (PPS), polycarbonate (PC), and acrylonitrile butadiene styrene (ABS), as well as fiber-reinforced resins made by adding glass fiber to these resins. These resin materials can be manufactured using known manufacturing methods such as injection molding. The locking piece is preferably made of a resin material that is easily elastically deformed. Furthermore, the material is not limited to a resin material, and it may also be formed using a metal member. Examples of metal members that may be formed by processing aluminum, brass, or stainless steel, for example, may be used. The JIS standard for the protection rating (IP code) of electrical machinery and equipment enclosures is JIS C0920. [Effects of the Invention]

[0027] The present invention makes it easy to secure flexible conduits, and is highly effective in the field of securing cables for various machines and the like that are installed in harsh environments. [Brief explanation of the drawings]

[0028] [Figure 1] FIG. 1 is a perspective view showing the arrangement of components of a cable gland according to an embodiment of the present invention; [Figure 2] 1 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 the present embodiment. FIG. [Figure 3] FIG. 10 is a perspective view showing a state in which an extension cap and a locking piece that constitute a flexible conduit connection portion are connected together. [Figure 4] 10A and 10B are diagrams showing an extension cap, in which FIG. 10A is a perspective view seen from the fitting portion side, and FIG. 10B is a perspective view seen from the nut portion side. [Figure 5]1A and 1B are diagrams showing a locking piece, in which (a) is a diagram of the flange side as seen from the axial direction, (b) is a diagram as seen from the side, and (c) is a perspective view as seen from the flange side. [Figure 6] 10 is a perspective view showing a state in which a packing is inserted into the mounting portion of the gland body in the opening of the electrical equipment and then fixed with a lock nut from inside the electrical equipment. FIG. [Figure 7] 10 is a perspective view showing a state in which the nut portion of the extension cap is screwed onto the cable holding portion to tighten and fix the cable. FIG. [Figure 8] FIG. 10 is a perspective view showing a state in which the engaging portion of the locking piece is clamped in the recess of the flexible electrical conduit. [Figure 9] 10A and 10B are diagrams showing the state in which the ring portion of the locking piece is inserted into the fitting portion of the extension cap with the flexible conduit clamped therein, and the groove and protrusion are fitted together to fix the flexible conduit, where (a) is a perspective view and (b) is a cross-sectional view cut along the axial direction. DETAILED DESCRIPTION OF THE INVENTION

[0029] (Embodiment)

[0030] A cable gland 1 according to an embodiment of the present invention will be described in detail below. FIG. 1 is a perspective view showing the arrangement of components of the cable gland 1 according to this embodiment. FIG. 2 is a perspective view showing a state in which a cable 50 and a flexible conduit 60 are fixed and connected using the cable gland 1 according to this embodiment. Note that electrical equipment is not shown in FIG. 2. FIG. 3 is a perspective view showing a state in which an extension cap 20 and a locking piece 30 constituting a flexible conduit connection part 10 are connected. FIG. 4 shows the extension cap 20, where (a) is a perspective view seen from the fitting part 26 side, and (b) is a perspective view seen from the nut part 21 side. FIG. 5 shows the locking piece 30, where (a) is a view of the flange part 32 side from the axial direction, (b) is a side view, and (c) is a perspective view seen from the flange part 32 side. The configuration of the cable gland 1 according to the 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 is cylindrical in shape and allows the insertion of a cable 50. It has a flange 41 and a cable holding section 42 and an attachment section 43 on either side of the flange 41, with male threads formed on the outer surface of each section; a sleeve 44 which has an insertion hole for the cable 50 and is fitted into the cable holding section 42; a lock nut 46 which has a female thread that meshes with the male thread of the attachment section 43; and a flexible conduit connection section 10 which consists of an extension cap 20 which screws onto the male thread of the cable holding section 42 and has the other end into which a flexible conduit 60 is inserted; and a locking piece 30 which fixes and holds the flexible conduit 60 by an engaging section 37 and fits into the extension cap 20 to connect.

[0032] In this embodiment, a washer 47 is further provided rotatably between the sleeve 44 and the extension cap 20. By providing the washer 47, it is possible to prevent the sleeve 44 from being damaged when the extension cap 20 is tightened. However, the washer 47 is not necessarily provided.

[0033] The sleeve 44 has an insertion hole for passing the cable 50, is inserted into the cable holding part 42, and has a cylindrical shape with elasticity. The diameter of the sleeve 44 decreases toward the gland body 40, and it appears trapezoidal in side view. The inner surface of the cable holding part 42 has a shape that matches this trapezoidal shape. In this embodiment, the sleeve 44 has only one insertion hole, but if multiple cables are to be passed through, the sleeve 44 may have insertion 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 the mounting portion 43 of the gland body 40 is inserted into an opening in the housing of the electrical device, it is screwed in from the inside of the housing. For this purpose, a gasket 45 is also provided. The gasket 45 is made of, for example, rubber and is elastically deformable, and seals the gap in the opening of the electrical device. The sleeve 44 is also made of, for example, rubber and is elastically deformable, and deforms when the nut portion 21 of the extension cap 20 is screwed in, pressing against the cable 50 from the surrounding area and providing a tight seal, making it waterproof.

[0035] The flexible conduit 60 covers and protects the outer periphery of the cable 50, and has an uneven surface, with the engaging portion 37 of the locking piece 30 being clamped and fixed in the recessed portion 60a.

[0036] The nut portion 21 of the extension cap 20 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 so that the mounting portion 43 is inserted into an opening provided in the housing of the electrical device and is fixed with a lock nut 46 via a packing 45.

[0037] The cable 50 inserted inside the gland body 40 is tightly fixed by screwing the nut portion 21 of the extension cap 20 onto the cable holding portion 42, thereby deforming the sleeve 44. In this case, as shown in FIG. 1, a rotatable washer 47 is interposed between the sleeve 44 and the extension cap 20. By providing the washer 47, when the extension cap 20 is screwed onto the cable holding portion 42, the washer 47 presses the sleeve 44 while sliding relative to the extension cap 20. As a result, the sleeve 44 is not scratched by being rubbed against 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 an outer diameter larger than that of the annular part 31, at least two engagement 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 engagement parts 37 are configured to be sandwiched in the recessed part 60a of the flexible conduit 60, and the annular part 31 is configured to fit into the fitting part 26 of the extension cap 20.

[0039] In this embodiment, as shown in Fig. 5, the engaging portions 37 are provided at opposing positions so as to protrude from the inner circumferential surface toward the center, approximately a quarter of the circumference. These engaging portions 37 are sandwiched in the recessed portion 60a of the flexible conduit 60, so that the flexible conduit 60 can be reliably fixed.

[0040] The locking piece 30 has a notch 34, so that by applying force to widen the notch 34 and then clamping the engaging portion 37 into the recess 60a of the flexible conduit 60, the fitting can be performed easily and reliably. When fitting the annular portion 31 into the fitting portion 26, the notch 34 can be left in its original state or by applying force to narrow the notch 34 and inserting it into the annular portion 26, allowing for easy fitting.

[0041] The outer peripheral surface of the nut portion 21 is formed with a plurality of flat portions 22 for screw tightening. In this embodiment, six flat portions 22 are formed, and a wrench is placed against these flat portions 22 to tighten the screw. In this embodiment, an inserted portion 25 is provided to connect the nut portion 21 of the extension cap 20 with the fitting portion 26. The inner surface of the boundary between this inserted portion 25 and the nut portion 21 is formed into a cone shape 24 to match the shape of the sleeve. The inserted 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, two grooves 27 are provided at opposing positions on the inner surface of the fitting portion 26 of the extension cap 20. A protrusion 35 is provided on the outer surface of the annular portion 31 of the locking piece 30 at a position corresponding to the groove 27. The groove 27 and the protrusion 35 are shaped to fit together. This makes the fitting between the fitting portion 26 and the annular portion 31 more secure and less likely to come loose, making it less likely to come loose even when subjected to vibration, impact, or the like.

[0043] As shown in FIG. 4, the groove 27 is formed from the tip of the fitting portion 26, extends toward the inserted portion 25, and then extends in the circumferential direction of the fitting portion 26. Furthermore, a protrusion 27a is provided in a portion of the groove 27 in the circumferential direction. Meanwhile, the protrusion 35 has a shape that matches the circumferential width of the groove 27, and a recess 35a is provided in the center of the protrusion 35. When the protrusion 35 is inserted and pressed into the tip of the groove 27 and then rotated in the circumferential direction, the protrusion 27a of the groove 27 fits into the recess 35a of the protrusion 35, thereby securing the extension cap 20 and the locking piece 30 in place. This configuration allows for stable fastening of the extension cap 20 and the locking piece 30.

[0044] In this way, even when protrusion 27a and recess 35a are provided, they can be easily fitted together because locking piece 30 has cutout 34 and thin-walled portion 36, so even when fitted into fitting portion 26, locking piece 30 can deform so that it shrinks by approximately the width of cutout 34.

[0045] In this embodiment, groove 27 is provided with protrusion 27a, and protrusion 35 is provided with recess 35a in the center thereof for engagement, but the present invention is not limited to this configuration. A recess may be provided in groove 27, and a protrusion may be provided in protrusion 35, or engagement is possible without providing protrusion 27a and recess 35a. In other words, various commonly used configurations may be used as long as annular portion 31 can be inserted into engagement portion 26 and the engagement portion 26 and the annular portion 31 can be fixed together. Furthermore, in this embodiment, two grooves 27 are provided at opposing positions, but three or four grooves may be provided, and accordingly, three or four protrusions 35 may also be provided.

[0046] In this embodiment, the flange 32 of the locking piece 30 is provided with a thinned portion 36, which is a predetermined area cut away with the center facing the notched portion 34. By providing the thinned portion 36 in this manner, the notched portion can be easily widened or narrowed by applying a small force, making it easier to insert and fix the flexible conduit 60. Next, a method for fixing the cable gland 1 according to this embodiment to an electric device, a cable, and a flexible conduit will be described.

[0047] 6 is a perspective view showing a state in which the packing 45 is inserted into the mounting portion 43 of the gland body 40 in the opening (not shown) of the electrical equipment 70 and then fixed with a lock nut (not shown) from inside the electrical equipment 70. The cable 50 is pulled out from the gland body 40. In this state, the cable 50 is not yet fixed.

[0048] 7 is a perspective view showing the state in which the nut portion 21 of the extension cap 20 is screwed onto the cable holding portion 42 to tighten and fix the cable 50. Although not shown, a sleeve 44 and a washer 47 are provided inside the cable holding portion 42 and the nut portion 21, and when screwed together, the sleeve 44 is deformed to press against the cable 50, thereby tightly fixing the cable 50.

[0049] 8 is a perspective view showing the state in which the engaging portion 37 of the locking piece 30 is sandwiched in the recess 60a of the flexible conduit 60. Because the locking piece 30 has a circular shape, when sandwiching the engaging portion 37 in the recess 60a of the flexible conduit 60, force is applied to slightly open the notch 34 to make it easier to insert and sandwich the flexible conduit 60. After sandwiching, removing the applied force returns the conduit to its original circular shape, but the sandwiched state is maintained. The flexible conduit 60 is inserted close to the water pressure relief hole 28 of the extension cap 20.

[0050] 9A and 9B are diagrams showing a state in which the ring portion 31 of the locking piece 30 is inserted into the fitting portion 26 of the extension cap 20 with the flexible conduit 60 sandwiched therein, and the groove portion 27 is fitted into the protrusion portion 35 to fix the flexible conduit 60, where (a) is a perspective view and (b) is a cross-sectional view cut along the axial direction.

[0051] When inserting the annular portion 31 into the fitting portion 26, a force may be applied 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 necessary to apply a 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 periphery of the annular portion 32, and by gripping this convex portion 33 during insertion, the operation can be easily performed.

[0052] As described above, in the cable gland 1 of the present invention, the cable 50 is fixed by screwing the nut portion 21 of the extension cap 20 onto the cable holding portion 42. The flexible conduit 60 can be fixed by clamping 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 fitting the groove portion 27 into the protrusion 35. The flexible conduit 60 can be easily removed by rotating the locking piece 30 in the opposite direction to remove the protrusion 35 from the groove portion 27. [Industrial Applicability]

[0053] The cable gland of the present invention provides waterproofing when a cable is fixed to equipment, and also makes it easy to hold a flexible conduit for protecting an exposed cable, making it useful in a variety of electrical equipment fields where cables are connected to electrical equipment. [Explanation of symbols]

[0054] 1 cable gland 10 Flexible conduit connection 20 Extension Cap 21 Nut 22 Flat area 23 Female thread 24 Cone Shape 25 Interpolation part 26 Fitting part 27 Groove 27a Projection 28 Water pressure relief hole 30 Rocking Piece 31 Annular part 32 Flange 33 Convex part 34 Notch 35 Protrusion 35a recess 36 Thin-walled section 37 Engagement part 40 Grand body 41 Tsuba 42 Cable holder 43 Mounting part 44 sleeve 45 Gasket 46 Lock nut 47 Washer 50 Cable 60 Flexible conduit 60a recess 70 Electrical Equipment

Claims

1. a gland body having a cylindrical shape that allows a cable to be inserted, and having a flange portion and a cable holding portion and an attachment portion provided on both sides of the flange portion, each of which has a male thread formed on its outer circumferential surface; a sleeve having an insertion hole through which the cable passes and fitted into the cable holding portion; a lock nut having a female thread formed thereon that engages with the male thread of the mounting portion; a flexible conduit connection part consisting of an extension cap that screws onto the male thread of the cable holding part and into which a flexible conduit is inserted, and a locking piece that fixes and holds the flexible conduit with an engaging part and fits into the extension cap to connect the flexible conduit.

2. 2. The cable gland according to claim 1, further comprising a washer rotatably interposed between the sleeve and the extension cap.

3. The extension cap has a nut portion having a female thread formed on the inner surface of one end thereof, an insertion portion provided on the opposite side of the nut portion and into which the flexible electric conduit is inserted, and a fitting portion into which the locking piece is fitted, The locking piece includes a circular ring portion having an outer diameter dimension that fits into the fitting portion, a flange-shaped portion provided at an end of the circular ring portion and having an outer diameter larger than that of the circular ring portion, at least two engagement portions provided on an inner peripheral surface of the circular ring portion, and notches cut out along the axial direction in the circular ring portion and the flange-shaped portion, 2. The cable gland according to claim 1, wherein the engaging portion is held in a recess of the flexible conduit, and the annular portion is fitted into the fitting portion of the extension cap.

4. At least two grooves are provided on the inner surface of the fitting portion of the extension cap, a protrusion 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, wherein the groove and the protrusion are engaged with each other.

5. 4. The cable gland according to claim 3, wherein the flange of the locking piece has a thinned portion formed in a predetermined area centered on a position facing the notch.

6. 6. The cable gland according to claim 1, wherein an inner diameter dimension of the locking piece and a shape of the engaging portion are set to suit various outer diameter dimensions and uneven shapes of the flexible electric conduit, respectively, so that various flexible electric conduits can be connected by selecting the locking piece.

Images