Wiring bushing

Abstract

This wiring bushing is attached to a wiring lead-in port provided in a panel of a housing, to allow wiring to pass through the wiring lead-in port. The wiring bushing includes a first bushing attached to the wiring lead-in port. The first bushing includes: a cylindrical tubular portion formed so as to extend in an insertion direction for insertion into the wiring lead-in port; and a bottom portion closing a front-end opening in the insertion direction of the tubular portion. One or more wiring ports for passing wiring are formed through the tubular portion. Within the first bushing, a wiring passage portion extending from a rear-end opening in the insertion direction of the cylindrical portion to the one or more wiring ports includes, at least in part, a portion formed with dimensions such that a test finger defined by safety standards cannot pass through any of the wiring ports.

Description

Wiring bushing

[0001] The present disclosure relates to a wiring bushing that is attached to a wiring inlet.

[0002] Patent Document 1 discloses an electric wire fastener for fastening wires to a wire inlet opening formed in a panel of a housing.

[0003] Patent No. 6280816

[0004] Incidentally, wiring connections such as terminal blocks are disposed inside the housing of devices such as air conditioners. Wiring inlets are formed through the panel of the housing. Therefore, if the wiring connection is disposed near the wiring inlet, there is a possibility that a finger may come into contact with the wiring connection when inserted into the wiring inlet. Therefore, wiring bushes attached to the wiring inlet are required to have measures to prevent fingers from coming into contact with the wiring connection.

[0005] However, although the wire fastener of Patent Document 1 is designed to improve the ease of use when fastening a wire to a wiring inlet, no consideration is given to the possibility of fingers coming into contact with the wiring connection portion through the wiring inlet, and no measures are taken.

[0006] The present disclosure is intended to solve the above-mentioned problems, and has an object to provide a wiring bush that can prevent fingers from entering the inside of a housing.

[0007] The wiring bush of the present disclosure is a wiring bush that is attached to a wiring inlet provided in a panel of a housing and through which wiring passes, and has a first bush that is attached to the wiring inlet, and the first bush has a tubular cylindrical portion that is formed and extends in the insertion direction of insertion into the wiring inlet, and a bottom portion that closes the opening at the tip end side of the cylindrical portion in the insertion direction, and one or more wiring ports through which the wiring passes are formed by passing through the cylindrical portion, and the wiring passage portion inside the first bush that extends from the opening at the rear end side in the insertion direction of the cylindrical portion to the one or more wiring ports has at least a portion that is formed to be sized so that a test finger based on safety standards cannot pass through the one or more wiring ports.

[0008] According to the present disclosure, it is possible to provide a wiring bush that can prevent fingers from entering the inside of a housing.

[0009] 9 is a perspective view showing a state in which a wiring bush according to the first embodiment is used. FIG. 10 is an exploded perspective view showing a state in which the wiring bush according to the first embodiment is removed from a wiring inlet. FIG. 11 is an explanatory diagram of a wire connection portion inside a housing to which the wiring bush according to the first embodiment is connected. FIG. 11 is a perspective view of the wiring bush according to the first embodiment as seen from the rear end side in the insertion direction. FIG. 12 is an exploded perspective view of the wiring bush according to the first embodiment. FIG. 13 is a perspective view of a first bush of the wiring bush according to the first embodiment as seen from the front end side in the insertion direction. FIG. 14 is a perspective view of the first bush of the wiring bush according to the first embodiment as seen from the rear end side in the insertion direction. FIG. 15 is a side view of the first bush of the wiring bush according to the first embodiment. FIG. 16 is a rear view of the first bush of the wiring bush according to the first embodiment as seen from the rear end side in the insertion direction. FIG. 17 is a cross-sectional view taken along the Y-Y line of FIG. 10. FIG. 11 is a perspective view of the wiring bush according to the first embodiment as seen from inside a housing. FIG. 12 is a view showing a state in which wires are passed through the wiring bush according to the first embodiment. FIG. 13 is a view showing a state in which wires are tied to the wiring bush according to the first embodiment with a cable tie. FIG. 14 is a view showing a modified example of a protrusion at the bottom of the first bush according to the first embodiment. FIG. 15 is a view showing a modified example of the first bush according to the first embodiment.

[0010] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. Note that the drawings are merely examples and are not intended to limit the present disclosure. Furthermore, components with the same reference numerals in the drawings are identical or equivalent, and this is common throughout the specification. Furthermore, the size relationships between components in the drawings may differ from the actual size relationships.

[0011] Embodiment 1. Fig. 1 is a perspective view showing a wiring bush 1 according to embodiment 1 in use. Fig. 2 is an exploded perspective view showing the wiring bush 1 according to embodiment 1 removed from a wiring inlet 101. Fig. 3 is an explanatory diagram of a wiring connection portion 103 inside a housing 100 to which the wiring bush 1 according to embodiment 1 is connected.

[0012] The wiring bush 1 is attached to a wiring inlet 101 of a housing 100 of equipment such as an air conditioner. The wiring bush 1 protects the wiring 102 from damage due to contact with the opening edge of the wiring inlet 101, etc. The wiring bush 1 has a first bush 2 and a second bush 9. The wiring inlet 101 is a circular opening formed in a panel 104 that forms the outer shell of the housing 100, and is an opening for drawing the wiring 102 from the outside of the housing 100 into the inside of the housing 100.

[0013] The housing 100 is, for example, a control box in which electronic boards and the like are disposed. A wiring connection section 103 including a terminal block for a charging section and the like is disposed inside the housing 100. An end of a wiring 102 that is drawn from the outside of the housing 100 into the inside of the housing 100 via a wiring inlet 101 is connected to the wiring connection section 103. A maintenance opening 105 is provided in the panel 104, and a removable lid 106 is attached to the maintenance opening 105.

[0014] For example, in air conditioners for buildings, multiple indoor units are connected to one outdoor unit, and the transmission lines connecting the outdoor and indoor units and the bridging wiring connecting the remote control lines between the indoor units are drawn into the control box of the indoor units. The indoor units also receive multiple wires for optional components such as humidifiers or separate sensors. There are countless combinations of these wires, and providing individual wire inlets for each combination in the control box housing is difficult from the standpoint of installation space and economy. For this reason, the housing is generally provided with wire inlets large enough to accommodate multiple wires.

[0015] Meanwhile, the Safety of Household and Similar Electrical Appliances - Part 1: General Provisions JIS C9335-1: Clause 8 "Protection against Access to Live Parts" states the following requirement regarding wiring inlets: If a wiring inlet is sized to accommodate multiple wires and there are only a few wires passing through it, a finger inserted into the wiring inlet may come into contact with the wiring connection. For this reason, "Protection against Access to Live Parts" states the requirement that when a test finger specified in JIS C0922 is inserted into a wiring inlet, the finger will not come into contact with the wiring connection.

[0016] The wiring bush 1 has a structure described below, which prevents fingers from entering the inside of the housing 100 through the wiring inlet 101 and touching the wiring connection portion 103 .

[0017] FIG. 4 is a perspective view of the wiring bush 1 according to the first embodiment, as seen from the rear end side in the insertion direction D. FIG. 5 is an exploded perspective view of the wiring bush 1 according to the first embodiment. FIG. 6 is a perspective view of the first bush 2 of the wiring bush 1 according to the first embodiment, as seen from the front end side in the insertion direction D. FIG. 7 is a perspective view of the first bush 2 of the wiring bush 1 according to the first embodiment, as seen from the rear end side in the insertion direction D. FIG. 8 is a side view of the first bush 2 of the wiring bush 1 according to the first embodiment. FIG. 9 is a rear view of the first bush 2 of the wiring bush 1 according to the first embodiment, as seen from the rear end side in the insertion direction D. FIG. 10 is a Y-Y cross-sectional view of FIG. 9. FIG. 11 is a perspective view of the wiring bush 1 according to the first embodiment, as seen from the inside of the housing 100. In the following description, the terms "inside" and "outside" (including inside, outside, inner surface, and outer surface) may be used to describe positional relationships and directions. However, unless otherwise specified, the central portion of the wiring bush 1 is referred to as the inside, and the outer side of the wiring bush 1 is referred to as the outside, respectively.

[0018] The wiring bushing 1 has an annular first bushing 2 that is attached to the wiring inlet 101, and a second bushing 9 that is connected to the first bushing 2. The first bushing 2 and the second bushing 9 are made of, for example, rubber resin.

[0019] (First bushing 2) The first bushing 2 is intended to protect the wires 102 passing through the wire inlet 101 and to prevent the intrusion of fingers. The first bushing 2 has a cylindrical portion 5 formed to extend in the insertion direction D of insertion, and a bottom portion 6 provided on the tip side of the cylindrical portion 5 in the insertion direction D. In the first bushing 2, an opening on the tip side of the cylindrical portion 5 in the insertion direction D is closed by the bottom portion 6. The interior of the first bushing 2 forms a wire-passing portion 20 for passing the wires 102. In the first bushing 2, the interior of the first bushing 2 from an opening 32 on the rear end side of the cylindrical portion 5 in the insertion direction D to a wire port 33 described below forms the wire-passing portion 20. The wire-passing portion 20 has at least a portion sized to prevent a test finger based on safety standards from passing through the wire port 33. The first bushing 2 has such a wire passing portion 20, thereby preventing fingers from entering the inside of the housing 100 through the wire inlet 101 and touching the wire connection portion 103. This point will be explained later.

[0020] The cylindrical portion 5 has an insertion cylindrical portion 3 formed in a cylindrical shape with a smaller diameter than the wiring inlet 101, but essentially the same diameter, so that it can be inserted into the wiring inlet 101, and a flange cylindrical portion 4 formed in a cylindrical shape with a larger diameter than the inner diameter of the wiring inlet 101 and abutting the outer surface of the panel 104.

[0021] The insertion cylindrical portion 3 is formed with a wiring port 33 through which the wiring 102 passes. A plurality of wiring ports 33 are formed at intervals in the circumferential direction. In the illustrated example, the wiring ports 33 are formed across the insertion cylindrical portion 3 and the outer periphery of the bottom portion 6, but they may be formed only in the insertion cylindrical portion 3. The shape of the wiring ports 33 is not particularly limited, and may be rectangular as in the illustrated example, or circular. In the illustrated example, there are three wiring ports 33, but the number of wiring ports 33 may be one or more.

[0022] The wiring port 33 is sized to prevent a test finger from passing through it in accordance with safety standards. Examples of safety standards include the JIS standard and the Electrical Appliance and Material Safety Act. Since the diameter of the test probe B, which serves as a test finger as defined in JIS C0922, is 12 mm, the size of the wiring port 33 is less than 12 mm. Specifically, when the wiring port 33 is rectangular, the distance L between a pair of opposing long sides is less than 12 mm, as shown in FIG. 6 .

[0023] The insertion cylindrical portion 3 includes arc portions 31 between circumferentially adjacent wiring ports 33. The insertion cylindrical portion 3 has three arc portions 31 in the circumferential direction. The arc portions 31 are formed with locking claws 31a for attaching the first bushing 2 to the wiring inlet 101 and cable tie holes 31b for passing the straps 82 of the cable tie 80 (see FIG. 13 described later).

[0024] The locking claw 31a is formed on the rear end side of the arc portion 31 in the insertion direction D. The locking claw 31a is configured as an elastic piece whose rear end side in the insertion direction D is a free end. The locking claw 31a is formed so that the amount of protrusion from the outer circumferential surface of the arc portion 31 gradually increases from the front end side in the insertion direction D toward the rear end side in the insertion direction D. The distance W (see FIG. 10 ) between the protruding portion of the locking claw 31a and the flange cylindrical portion 4 is formed so as to be approximately the same as or slightly larger than the thickness of the panel 104 in which the wiring inlet 101 of the housing 100 is formed.

[0025] The hole 31b for the cable tie is formed on the tip side of the arc portion 31 in the insertion direction D. The hole 31b for the cable tie is formed to penetrate the arc portion 31. The hole 31b for the cable tie is formed to a size that allows the strap 82 of the cable tie 80 (see FIG. 13 described later) to pass through but does not allow the head 81 of the cable tie 80 to pass through.

[0026] The flange cylindrical portion 4 is formed in a cylindrical shape with a diameter larger than the inner diameter of the wiring inlet 101, and has an engagement portion 41 that abuts against the outer surface of the panel 104, and multiple leg portions 42 that extend radially from the tip side of the engagement portion 41 in the insertion direction D and connect to the insertion cylindrical portion 3. The inner peripheral surface of the engagement portion 41 is provided with protruding pieces 43 that protrude inward. Multiple protruding pieces 43 are formed at intervals in the circumferential direction. In the illustrated example, three protruding pieces 43 are formed, but the number is not limited to three and may be two or more.

[0027] As shown in FIG. 10 , the bottom 6 has a protrusion 6a that protrudes toward the rear end in the insertion direction D, in other words, toward the inside of the first bushing 2. The protrusion 6a serves to improve the strength of the bottom 6 against pressure from a finger. In the illustrated example, the protrusion 6a is formed by the bottom 6 having a uniform thickness and the bottom 6 itself protruding toward the rear end in the insertion direction D, but it may also be formed by increasing the thickness of the bottom 6 itself. The surface of the protrusion 6a is formed in a spherical shape. The spherical surface of the protrusion 6a has the effect of guiding the wire 102 toward the wire port 33, as described below, but the shape of the protrusion 6a is not limited to a spherical shape.

[0028] 4 and 5 , the second bushing 9 is connected to the cylindrical portion 5 of the first bushing 2 and closes the opening 32 at the rear end of the cylindrical portion 5 in the insertion direction D. The second bushing 9 is inserted into the flange cylindrical portion 4 of the cylindrical portion 5. The second bushing 9 prevents foreign matter such as dust or pests from entering the housing 100 through the wiring inlet 101. The second bushing 9 is formed in a cylindrical shape extending in the insertion direction D. The second bushing 9 has an insertion portion 8 that is inserted into the flange cylindrical portion 4 of the first bushing 2, and a bottomed cylindrical lid portion 7 that is formed with a larger diameter than the insertion portion 8. Although not shown in detail, a groove is formed on the outer circumferential surface of the insertion portion 8, into which a protruding piece 43 formed on the flange cylindrical portion 4 of the first bushing 2 fits.

[0029] The lid 7 has a cylindrical side surface 72 and a disk-shaped bottom surface 71. The bottom surface 71 is thin and has a cross-shaped slit 71a formed therein for passing the wiring 102. The slit 71a is at least cross-shaped, and may have a plurality of slits radially extending from the center of the cross.

[0030] The second bushing 9 is connected to the first bushing 2 by pushing the insertion portion 8 into the flange cylindrical portion 4 of the first bushing 2 and fitting the protruding piece 43 formed on the flange cylindrical portion 4 into a groove formed in the insertion portion 8. The connection structure between the second bushing 9 and the first bushing 2 is not particularly limited, and may be connection by engagement between a claw and a locking hole, for example.

[0031] In the above configuration, the wiring bush 1 has the second bush 9, but the second bush 9 can be omitted. The wiring bush 1 may be composed of only the first bush 2. However, it is desirable that the wiring bush 1 include the second bush 9 in order to prevent foreign matter from entering the inside of the housing 100 through the wiring inlet 101.

[0032] The wiring bushing 1 configured as described above is attached to the wiring inlet 101 of the housing 100 as follows. First, as shown in FIG. 4 , the second bushing 9 is connected to the first bushing 2 to assemble the wiring bushing 1. Then, the insertion cylindrical portion 3 of the first bushing 2 is inserted into the wiring inlet 101 and pushed in until the flange cylindrical portion 4 abuts against the outer surface of the panel 104. At this time, the locking claws 31a abut against the opening edge of the wiring inlet 101, causing elastic deformation, and are pressed inward to pass through the wiring inlet 101. Once the locking claws 31a pass through the wiring inlet 101, the pressure is released and the locking claws 31a return to their original state. The locking claws 31a, having returned to their original state, are locked to the opening edge of the wiring inlet 101, and the panel 104 is clamped between the locking claws 31a and the flange cylindrical portion 4. As a result, as shown in FIG. 11 , the wiring bushing 1 is attached to the wiring inlet 101 in a state where the insertion cylindrical portion 3 of the first bushing 2 protrudes inside the housing 100 .

[0033] 12 is a diagram showing a state in which a wire 102 is passed through the wiring bush 1 according to the first embodiment. As shown in Fig. 12, the wire 102 is inserted into the wiring bush 1 through the slit 71a of the second bush 9 and passed through the wire-passing portion 20 (see Fig. 10) of the first bush 2. Specifically, the wire 102 is passed through the opening 32 on the rear end side of the first bush 2 in the insertion direction D into the inside of the first bush 2 and is drawn out of the first bush 2 through the wire opening 33. The tip end of the wire 102 drawn out of the first bush 2 is connected to the wire connection portion 103.

[0034] 13 is a diagram showing a state in which a wire 102 is bound to the wiring bush 1 according to the first embodiment with a cable tie 80. As shown in FIG. 13 , the wire 102 passed through the wiring bush 1 may be bound with the cable tie 80. The cable tie 80 has a head 81 and a strap 82 extending from the head 81. In the bound state, the head 81 is located on the outer surface of the arc portion 31. The strap 82 is passed through the wire port 33 to surround the wire 102, passes through the cable tie hole 31b from the inner surface to the outer surface of the arc portion 31, and further, the tip 82a of the strap 82 is passed through the through hole 81a of the head 81 so as not to be removed, thereby binding the wire 102.

[0035] Next, the operation of the above-described configuration will be described. The wire-passing portion 20 of the first bushing 2 has at least a portion sized to prevent a test finger from passing through the wire port 33 in accordance with safety standards. Specifically, the wire port 33 provided in the first bushing 2 is sized to prevent a test finger from passing through in accordance with safety standards. Therefore, when at least the first bushing 2 of the wiring bushing 1 is attached to the wire inlet port 101, a finger cannot be inserted into the housing 100 via the first bushing 2, and the wiring bushing 1 can prevent a finger from entering the housing 100. Because the wiring bushing 1 can prevent a finger from entering the housing 100, it can prevent a finger from touching the wire connection portion 103.

[0036] The wiring bush 1 can prevent fingers from entering the inside of the housing 100, making it possible to position the wiring connection part 103 close to the wiring inlet 101, thereby enabling the housing 100 to be made smaller and increasing the freedom of layout.

[0037] As described above, the wire 102 passes through the interior of the first bushing 2 from the opening 32 of the cylindrical portion 5, and is drawn out of the first bushing 2 from the wire port 33. At this time, the wire 102 strikes the protruding portion 6a on the bottom portion 6 of the first bushing 2, and is then guided to the wire port 33 by the spherical shape of the surface of the protruding portion 6a. In this way, the wiring bushing 1 allows the wire 102 to be easily handled because the surface of the protruding portion 6a on the bottom portion 6 is spherical.

[0038] In the first bushing 2, the locking claw 31a is provided on the insertion cylindrical portion 3. In other words, the locking claw 31a is provided on a portion that is located inside the housing 100 when the first bushing 2 is attached to the wiring inlet port 101. Therefore, there is no need to worry about the locking claw 31a being touched from outside the housing 100, and the first bushing 2 will not easily come off from the wiring inlet port 101. On the other hand, when it is desired to remove the first bushing 2 from the wiring inlet port 101, the lid 106 is removed from the panel 104 of the housing 100 to open the maintenance opening 105, and the locking claw 31a can be elastically deformed through the maintenance opening 105, allowing for easy removal. This facilitates maintenance.

[0039] The first bushing 2 has a hole 31b for a cable tie. If the first bushing 2 did not have the hole 31b for a cable tie, the position of the cable tie 80 would be unstable, and the head 81 could block the wiring port 33. In contrast, by having the hole 31b for a cable tie in the first bushing 2, the position of the head 81 is determined around the hole 31b for a cable tie on the outer surface of the arc portion 31. This prevents the head 81 from blocking the wiring port 33, prevents the cable tie 80 from interfering with the passage of the wiring 102, and improves workability.

[0040] In the second bushing 9, the slit 71a through which the wire 102 passes is formed in the bottom 71 of the lid 7, and the bottom 71 is formed to be thin. Therefore, compared to a configuration in which the bottom 71 is formed to be thick, the force required to insert the wire 102 into the slit 71a and to extract it from the slit 71a can be reduced, improving workability.

[0041] In the above, an example has been described in which the wiring port 33 is formed to a size that does not allow a test finger based on the safety standard to pass through it, as an example of a configuration in which at least a part of the wiring passage portion 20 has a portion that is formed to a size that does not allow a test finger based on the safety standard to pass through the wiring port 33. As another example of a configuration in which at least a part of the wiring passage portion 20 has a portion that is formed to a size that does not allow a test finger based on the safety standard to pass through the wiring port 33, a configuration using a protrusion 6a may be used, as described below.

[0042] As described above, the protrusion 6a protrudes from the bottom 6 into the first bushing 2, and therefore acts to narrow the wire-passing portion 20. Therefore, the first bushing 2 may have a portion in at least a part of the wire-passing portion 20 that is large enough to prevent a test finger from passing through it in accordance with safety standards, by narrowing the wire-passing portion 20 with the protrusion 6a. In this case, the distance L of the wire opening 33 may be 12 mm or more, which allows the area of ​​the wire opening 33 to be enlarged and allows multiple wires 102 to be drawn into the wire opening 33.

[0043] The wiring bush 1 is not limited to the structure shown in the drawings, and can be modified as follows, for example, within the scope of the present disclosure.

[0044] 14 is a diagram showing a modified example of the protrusion 6a of the bottom portion 6 of the first bushing 2 according to the first embodiment. In this modified example, the protrusion 6a is configured as a rib protruding from the inner surface of the bottom portion 6. In the example shown in the figure, the protrusion 6a is configured as a plurality of ribs extending radially from the center of the bottom portion 6. In this way, the protrusion 6a may be configured as a rib. As described above, the protrusion 6a may be configured so as to improve the strength of the bottom portion 6 against pressure from a finger.

[0045] 15 is a diagram showing a modified example of the first bushing 2 according to the first embodiment. In this modified example, the first bushing 2 has one or more sub-wiring ports 6b penetrating the bottom portion 6 in the insertion direction D. In this manner, the first bushing 2 may have the sub-wiring ports 6b in addition to the wiring port 33. The sub-wiring ports 6b are formed to a size that does not allow a test finger to pass through, as required by safety standards. By having the sub-wiring ports 6b in addition to the wiring port 33, the first bushing 2 can ensure multiple wiring paths.

[0046] As described above, the wiring bushing 1 is attached to the wiring inlet 101 provided in the panel 104 of the housing 100, and is a bushing through which the wiring 102 passes through the wiring inlet 101. The wiring bushing 1 includes a first bushing 2 attached to the wiring inlet 101. The first bushing 2 includes a cylindrical portion 5 extending in an insertion direction D into the wiring inlet 101, and a bottom portion 6 closing an opening 32 at a leading end of the cylindrical portion 5 in the insertion direction D. One or more wiring ports 33 through which the wiring 102 passes are formed penetrating the cylindrical portion 5. Inside the first bushing 2, the wiring passage portion 20 extending from the opening 32 at the rear end of the cylindrical portion 5 in the insertion direction D to the one or more wiring ports 33 has at least a portion formed to a size that prevents a test finger based on a safety standard from passing through the one or more wiring ports 33. Specifically, the one or more wiring ports 33 are formed to a size that prevents a test finger based on a safety standard from passing through the one or more wiring ports 33. Alternatively, the bottom 6 has one or more sub-wiring ports 6b through which the wires 102 pass, and the one or more sub-wiring ports 6b are sized to not allow a test finger to pass through based on the safety standard. Alternatively, the bottom 6 has a protruding portion 6a that protrudes toward the rear end side in the insertion direction D to narrow the wire-passing portion 20, and the portion of the wire-passing portion 20 where the protruding portion 6a is formed is sized to not allow a test finger to pass through based on the safety standard.

[0047] With the above-described configuration, the wiring bush 1 can prevent fingers from entering the inside of the housing 100 .

[0048] The surface of the protrusion 6a is spherical.

[0049] With the above-described configuration, when the wire 102 is passed through the wiring bush 1, the spherical shape of the surface of the protrusion 6a guides the wire 102 to the wiring port 33. Therefore, the wiring bush 1 can improve the workability of the wire 102.

[0050] The cylindrical portion 5 is formed with a smaller diameter than the wiring inlet 101 and has an insertion cylindrical portion 3 that is inserted into the wiring inlet 101, and the insertion cylindrical portion 3 has a locking claw 31a that hooks onto the opening edge of the wiring inlet 101 of the panel 104.

[0051] With the above configuration, when the first bushing 2 is attached to the wiring inlet 101, the locking claw 31 a is located inside the housing 100. Therefore, there is no need to worry about the locking claw 31 a being touched from outside the housing 100, and the first bushing 2 can be prevented from easily coming off the wiring inlet 101.

[0052] The cylindrical portion 5 has a hole for passing the strap 82 of the cable tie 80 that ties the wiring 102 passed through the wiring passage portion 20, and has a cable tie hole 31b that is formed in a size that does not allow the head 81 of the cable tie 80 to pass through.

[0053] With the above-described configuration, the wiring bush 1 can prevent the wiring port 33 from being blocked by the head 81 of the binding band 80, thereby improving workability during wiring.

[0054] The wiring bushing 1 has a second bushing 9 connected to the cylindrical portion 5 of the first bushing 2 to close an opening 32 on the rear end side of the cylindrical portion 5 in the insertion direction D.

[0055] With the above-described configuration, the wiring bush 1 can prevent foreign matter such as dust or pests from entering the inside of the housing 100 through the wiring inlet 101 .

[0056] The second bushing 9 has an insertion portion 8 that is inserted into the inside of the first bushing 2, and a cylindrical lid portion 7 with a bottom that is formed with a larger diameter than the insertion portion 8. The bottom portion 71 of the lid portion 7 is formed with a thin wall, and a slit 71a is formed in the bottom portion 71 for passing the wiring 102 through.

[0057] With the above-described configuration, the force required to insert the wiring 102 into the slit 71a and to extract it from the slit 71a can be reduced compared to when the bottom 71 is formed thick, resulting in good workability.

[0058] REFERENCE SIGNS LIST 1 wiring bush, 2 first bush, 3 insertion cylindrical portion, 4 flange cylindrical portion, 5 cylindrical portion, 6 bottom portion, 6a protrusion portion, 6b sub-wiring port, 7 lid portion, 8 insertion portion, 9 second bush, 20 wiring passage portion, 31 arc portion, 31a locking claw, 31b hole for cable tie, 32 opening, 33 wiring port, 41 engagement portion, 42 leg portion, 43 protrusion piece, 71 bottom portion, 71a slit, 72 side portion, 80 cable tie, 81 head, 81a through hole, 82 strap, 82a tip portion, 100 housing, 101 wiring inlet, 102 wiring, 103 wiring connection portion, 104 panel, 105 maintenance opening, 106 lid.

Claims

1. A wiring bushing that is attached to a wiring entry port provided in the panel of the housing and through which wiring passes into the wiring entry port, It has a first bush that is attached to the wiring entry port, The first bush is, A cylindrical portion formed to extend in the insertion direction and inserted into the aforementioned wiring entry port, The cylindrical portion has a bottom portion that closes the opening on the tip side in the insertion direction, The cylindrical portion has a wiring port formed through it for passing the wiring through. Multiple wiring ports are formed across the outer circumference of the bottom portion, spaced apart in the circumferential direction. A wiring bush having, in the interior of the first bush, a portion of the wiring passage from the opening at the rear end of the cylindrical portion in the insertion direction to the wiring port, having at least a portion formed to prevent a test finger, in accordance with safety standards, from passing through the wiring port.

2. The wiring bushing according to claim 1, wherein one or more wiring ports are formed to be sized so as not to allow the test finger, as defined in the safety standard, to pass through.

3. The bottom portion has one or more auxiliary wiring ports for passing the wiring through, The wiring bushing according to claim 1 or claim 2, wherein one or more sub-wiring ports are formed to be sized so as not to allow the test finger, as defined in the safety standard, to pass through.

4. The bottom portion has a projection that narrows the wiring passage portion by protruding toward the rear end in the insertion direction, and the portion of the wiring passage portion in which the projection is formed is formed to be sized so that the test finger according to the safety standard cannot pass through.

5. The wiring bush according to claim 4, wherein the surface of the protruding portion has a spherical shape.

6. The cylindrical portion is formed to have a smaller diameter than the wiring entry port and has an insertion cylindrical portion that is inserted into the wiring entry port. The wiring bush according to claim 1 or claim 2, wherein the insertion cylindrical portion has a locking claw that catches on the opening edge of the wiring entry port of the panel.

7. The wiring bush according to claim 1 or 2, wherein the cylindrical portion has a hole for passing the strap of a cable tie that fastens the wiring passed through the wiring passage portion, and the hole is formed to be sized so that the head of the cable tie cannot pass through.

8. A wiring bush according to claim 1 or claim 2, further comprising a second bush connected to the cylindrical portion of the first bush and closing the opening on the rear end side in the insertion direction of the cylindrical portion.

9. The second bush has an insertion portion that is inserted into the interior of the first bush, and a bottomed cylindrical lid portion that is formed to be larger in diameter than the insertion portion. The wiring bush according to claim 8, wherein the bottom of the lid is formed to be thin, and a cross-shaped slit for passing the wiring is formed in the bottom of the lid.