JP2006156094A - Cord bush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a double-purpose cord bush capable of being used for cord slots of both a fit-in type and a screw type. <P>SOLUTION: The cord bush has a bush body 2 capable of elastically deforming provided with a plug-in part 3 capable of being plugged into cord slots 13, 20, a flange 4 at a rear-end of the plug-in part 3, and and a cord insertion path 3a formed along a full length of the plug-in part 3. A male screw part 6 for screwing and mounting is provided on an outer peripheral surface of a tip side of the plug-in part 3 of the bush body 2, and a circular groove 8 for insertion-coupling and mounting is provided on an outer peripheral part of the rear-end side of the plug-in part 3 following the male screwing part 6. With this, a seal can be obtained with one type of a cord bush in either a cord slot 12 of an fit-in type or a cord slot 17 of a screw type. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cord bush for sealing a cord derived from a cord port of a device.

  In a control panel installed outdoors, it is connected to an external device with a cord that is led out from the casing to the outside.

  Normally, in a control panel installed outdoors, the gap between the outer peripheral surface of the cord and the opening edge of the cord opening is filled with a cord bush to prevent water from entering the equipment through the cord. Measures are taken to prevent entry from the outside to the inside (waterproof, drip-proof).

  Specifically, as shown in FIG. 7, many cord bushes a have a cord insertion path d in the center to seal a cord port c formed in a part of a sheet metal casing b. An annular bushing body f having an annular groove e on the outer peripheral surface is used. That is, as shown in FIG. 7, the cord bush a is inserted into the cord mouth c by inserting the bush body f into the cord g and then fitting the annular groove e of the bush body f into the opening edge of the cord mouth c. The gap between the cord g and the opening edge of the cord port c is sealed.

  By the way, recently, the cord port has come out of a tubular member instead of a fitting (fitting) type formed by a through-hole of a wall-like member (sheet metal member). Most of the cylindrical members are wiring tube members having an internal thread formed on the inner surface. In the case of this screw type cord port, the cord bush is a dedicated cord formed on the outer peripheral portion with a different part from the cord bush, that is, an external thread portion combined with a female thread portion of a wiring pipe member (tubular member). A bush is used to seal the gap between the cord and the cord mouth.

  By the way, since the apparatus with which a code | cord | chord bush is calculated | required, for example, a water supply apparatus is comprised from the combination of many apparatuses, the insertion type | formula and screw type code | cord | chord port from which a format differs are mixed. Especially for water supply equipment installed outdoors, various motors equipped with terminal boxes with screw type code ports (those that drive water supply pumps) and various types of controls with fitting type code ports. Since a structure that combines a panel (which controls the water supply pump) is used, there are many different types of cord ports.

  In addition, the devices for which the cord bushing is required are not limited to such a mixture, and may be a device using only a fitting type cord bushing or a device using only a screw type cord bushing.

  However, the dedicated cord bush is not versatile for two types of cord mouth shapes. For this reason, there is a problem that the management of the cord bush becomes troublesome.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a dual-purpose cord bush that can be used in both a fitting (fitting) type and a screw type cord port.

  In order to achieve the above object, the invention according to claim 1 is formed over the entire length of the insertion portion that can be inserted into the cord port, a flange formed at the rear end portion of the insertion portion, An elastically deformable bushing body having a cord insertion passage through which a cord is sealed is provided, and a male screw portion for screwing is provided on the outer peripheral surface of the insertion portion, and the rear end of the insertion portion is provided after the male screw portion. An annular groove for fitting and mounting was provided on the outer peripheral portion on the side.

  With this configuration, when sealing a fitting type (through hole type) cord port, the cord is inserted into the cord insertion passage of the bushing body, and from that state, the insertion portion is inserted into the cord port, and the annular groove is the cord port. It is sufficient to insert until the opening edge fits. Thereby, the side surface of the flange is brought into close contact with the opening edge of the cord opening, and the gap between the outer peripheral surface of the cord and the opening edge of the cord opening is sealed together with the sealing of the cord in the cord insertion path.

  Also, when sealing the screw type (screw hole type) cord port, insert the cord into the cord insertion passage of the bushing body, and from that state, the flange will abut the opening edge of the cord port Just screw in. Then, the side surface of the flange is brought into close contact with the opening edge of the cord opening, and the gap between the outer peripheral surface of the cord and the opening edge of the cord opening is sealed together with the sealing of the cord in the cord insertion path.

  In the invention according to claim 2, in addition to the above-mentioned object, the annular groove is formed in the insertion portion from the rear end portion of the male thread portion to the side surface of the flange so that the cord bush is securely fixed at the opening end of the cord opening. The outer peripheral portion was formed of an annular groove having a stepped diameter that is equal to or less than the root diameter of the external thread.

  In addition to the above-described object, the invention according to claim 3 provides a wall surface of the cord insertion passage so that water can be prevented from entering through the cord insertion passage even if the sealing performance in the cord insertion passage becomes insufficient. In this case, a configuration is adopted in which an annular protrusion is formed in close contact with the outer peripheral surface of the cord as the bush body is attached to the cord opening.

  In the invention according to claim 4, in addition to the above object, the bushing body is made of rubber so as to ensure both high elasticity and high insulation.

  According to the first aspect of the present invention, each cord port can be sealed with one type of cord bush, whether the cord port is a fitting type (through hole type) or a screw type (screw hole type). it can.

  Therefore, the cord bush can be used both as a fitting type and a screw type cord port, and it is not necessary to prepare a cord bush according to the shape of the cord port, and management of the cord bush becomes easy.

  According to the second aspect of the present invention, in addition to the above-described effect, the support rigidity of the cord bush is sufficiently ensured when used for a fitting-type cord port.

  According to the third aspect of the present invention, in addition to the above-described effect, the sealing property provided by the annular protrusion can reliably prevent water from entering through the inside of the bushing body.

  According to the fourth aspect of the present invention, in addition to the above effects, it is possible to ensure the mounting property (easy to mount) and the insulating property with respect to the cord port which are easily required for the cord bushing.

[One Embodiment]
Hereinafter, the present invention will be described based on an embodiment shown in FIGS.

  FIG. 1 shows the overall appearance of the cord bush 1, and FIG. 2 shows a cross-sectional view of the bush 1.

  1 and 2 indicate the main body of the cord bush 1 (corresponding to the bush main body of the present application). The entirety of the main body 2 is formed of an elastically deformable member, specifically, a member having not only elasticity but also insulation, for example, a rubber member (made of rubber). The main body 2 has a structure in which a short cylindrical insertion portion 3 and a flange 4 are combined.

  Among these, the insertion part 3 is shape | molded by the short cylinder shape as FIG.1 and FIG.2 shows. The outer shape of the insertion portion 3 is a fitting (fitting) type cord port 12 formed on the wall surface of a sheet metal casing 11 of the control panel 10 as shown in FIG. For example, it is formed in a shape that can be inserted into a screw type (screw hole type) cord port 17 formed in the wall portion of the terminal box 16 of the electric motor 15 as shown in FIG. Here, for example, the plug-in cord port 12 includes a through hole formed in the sheet metal member 11a that forms the wall portion of the housing 11, and the cord 13 is led out from the housing 11 to the outside through the through hole. A code mouth structure is assumed. The screw-type cord port 17 includes a cylindrical member protruding from the wall portion of the terminal box 16, specifically, a cylindrical member 19 having a female screw portion 18 on the inner peripheral surface, and the cord 20 passes through the cylindrical member 19. It is assumed that the cord port structure is led out from the terminal box 16 to the outside.

  Further, a cord insertion passage 3 a into which a cord, that is, the cord 13 or the cord 20 can be inserted, is formed in the insertion portion 3 using a through space penetrating the shaft center. The passage diameter of the cord insertion passage 3a is set slightly larger than the cord diameter (for example, a gap is generated between the cord outer peripheral surface and the wall surface of the cord insertion passage 3a). On the wall surface forming the cord insertion passage 3a, annular projections 9 (corresponding to the annular projections of the present application) are formed at a plurality of locations, for example, at two front and rear locations. The height dimension of each protrusion 9 is determined to be a size that does not hinder the movement of the cord, for example, slightly slidably contacts the outer circumferential surface of the cord or moves away from the outer circumferential surface of the cord. Each protrusion 9 comes into close contact with the outer peripheral surface of the cord that passes through the cord insertion passage 3a as the diameter of the cord insertion passage 3a contracts due to the force applied from the periphery of the insertion portion 3. That is, each protrusion 9 seals around the cord 13 and the cord 20 that are inserted into the cord insertion passage 3a.

  A flange 4 is formed on the outer periphery of the rear end of the insertion portion 3 as shown in FIGS. 1 and 5. As a result, the cord bush 1 is configured such that when the insertion portion 3 is inserted into the cord port 12 or the cord port 17, the flange 4 is brought into close contact with the wall surface portion (opening edge) around the cord ports 12 and 17. .

  Further, as shown in FIGS. 1 and 2, a male screw 5 is formed on the outer peripheral surface of the insertion portion 3 from the front end portion to the vicinity of the rear end portion. The male screw 5 is formed with a screw thread and a length to be combined with the female screw portion 18 of the screw type cord port 17 shown in FIG. From the region where the male screw 5 is formed, a portion that can be screwed into the cord port 17, that is, a male screw portion 6 for screw mounting is formed. Further, the screw diameter of the external thread portion 6 is slightly larger than the thread diameter of the female thread portion 18 of the cord port 17, for example, and when the insertion portion 3 is screwed into the cord port 17, A deformation in a direction in which the diameter of the insertion passage 3a is reduced, that is, a direction in which the protrusion 9 is in close contact with the cord 20 is given.

  As shown in FIGS. 1 and 2, an annular groove 7 is formed on the rear outer peripheral surface of the insertion portion 3, continuing from the rear end portion of the male screw portion 6. The groove 7 is formed in the outer peripheral portion from the rear end portion of the external thread portion 6 to the side surface 4 a facing the inside of the flange 4. That is, the groove 7 is formed in a groove structure in which the rear end portion of the male screw portion 6 and the side surface 4a of the flange 4 are respectively wall surfaces. The groove 7 is formed in a stepped manner with a diameter dimension equal to or less than the root diameter of the male screw 5. The diameter of the groove 7 is slightly larger than, for example, the cord port 12 while maintaining this regulation. The width dimension of the groove 7 is made to correspond to the length of the through hole of the fitting type cord port 12, specifically, the thickness dimension of the sheet metal member forming the opening edge.

  From such a groove 7, a portion that can be fitted into the opening edge of the cord port 12, that is, an annular groove 8 for fitting and fitting, is formed on the rear end side of the male screw portion 6. Further, when the insertion portion 3 is fitted into the cord port 12 by the groove 8, the insertion portion 3 is deformed in a direction in which the diameter of the cord insertion passage 3 a is reduced, that is, in a direction in which the protrusion 9 is in close contact with the cord 20. It is like that.

  Further, as shown in FIGS. 1 and 2, the opening edge on the flange 4 side of the cord insertion passage 3a projects to the inside (near the shaft center) as a structure for sealing between the cords 13 and 20, for example. A lip portion 9a for sealing is formed. The lip portion 9a is formed of an annular thin portion so as to ensure a large amount of deformation. Using the elastic deformation of the lip portion 9a, even if the cords 13 and 20 have different types and sizes, when the various cords 13 and 20 are inserted into the cord insertion passage 3a, they come into contact with the outer peripheral surface of the cord. I have to do it. Thus, the sealing is continued between the various cords inserted into the cord insertion passage 3a regardless of the type and size of the cord.

  With such a structure, the cord bush 1 has a dual-purpose shape that can be used for both the fitting-type cord port 12 and the screw-type cord port 17.

  Next, how to handle the cord bush 1 will be described. Now, it is assumed that the cord 13 derived from the fitting-type cord port 12 is sealed using the cord bush 1 as shown in FIG.

  At this time, first, the cord 13 led out from the cord port 12 is inserted into the cord insertion passage 3a of the cord bush 1 as shown in FIG. At this time, since the lip portion 9a is only in contact with the outer peripheral surface of the cord portion 13 and the projection 9 does not affect the cord 13, the cord bush 1 has a gap between the cord 13 and the lip portion 9a. It is in a state where it can be freely moved on the cord 13 while being covered.

  Next, from the same state, the cord bush 1 is moved (shifted) to the cord port 12, and the insertion portion 3 of the cord bush 1 is guided to the cord port 12. And the front-end | tip part of the same insertion part 3 is pushed in into the cord port 12 (insertion). At this time, the diameter of the insertion portion 3 is larger than the opening of the cord port 12, but since the insertion portion 3 is formed of an elastic member (elastic member), for example, a rubber member, the outer peripheral portion of the insertion portion 3 is In accordance with the interference with the opening edge of the cord port 12, the same portion is inserted into the opening of the cord port 12 while being deformed (including the male screw portion 6). That is, the insertion part 3 is gradually inserted into the housing | casing 11 from a front-end | tip part. Then, as shown in FIG. 3A, as the insertion portion 3 is inserted until the side surface 4a of the flange 4 abuts against the outer wall surface of the housing 11, as shown in FIG. The wall portion forming the shape fits in the annular groove 8. Thereby, the cord bush 1 is fixed at the same point.

  The side surface 4a of the flange 4 of the cord bush 1 fixed in this manner is brought into close contact with the outer wall surface portion (opening edge) around the cord port 12 as shown in FIG. Each annular projection 9 is elastically brought into close contact with the outer peripheral surface of the cord 13 by receiving a displacement in the diameter-reducing direction of the cord insertion passage 3a generated when the opening edge of the cord port 12 and the annular groove 8 are fitted. (Elastic deformation of the protrusion 9: present).

  As a result, the periphery of the cord port 12 is sealed by the flange 4, and the periphery of the cord 13 is sealed by the lip portion 9 a and the protrusion 9.

  Thereby, the cord bush 1 can seal the seal in the fitting-type cord port 12, that is, the gap between the outer peripheral surface of the cord 13 and the opening edge of the cord port 12 (providing drip-proofing or waterproofing).

  Further, it is assumed that the cord 20 led out from the screw-type cord port 17 is sealed using the cord bush 1 as shown in FIG.

  At this time, first, the cord 20 led out from the cord port 17 is inserted into the cord insertion passage 3a of the cord bush 1 as shown in FIG. At this time, as in the case of the fitting type, the lip portion 9a is only in contact with the outer peripheral surface of the cord portion 13, and the projection 9 does not affect the cord 20. Therefore, the cord bush 1 is formed by the lip portion 9a. While the gap between the cord 13 and the cord 13 is covered, the cord 20 can be freely moved.

  Thereafter, from the same state, the cord bush 1 is moved (shifted) to the cord port 17, and the insertion portion 3 of the cord bush 1 is guided to the cord port 17. Then, the insertion part 3 is screwed into the cord port 17 from the tip part. As a result, the insertion portion 3 is inserted into the cylindrical member 19 in accordance with the engagement between the external thread portion 6 and the internal thread portion 18.

  At this time, the screw diameter of the male screw portion 6 is slightly larger than the screw diameter of the female screw portion 18, so that the insertion portion 3 formed of a rubber member is formed between the male screw portion 6 and the female screw portion 18. According to the meshing, the cord insertion passage 3a is deformed in the direction of narrowing (reducing diameter). Due to this behavior, each projection 9 on the inner surface of the cord insertion passage 3a is elastically brought into close contact with the outer peripheral surface of the cord 20 (elastic deformation of the projection 9: present).

  As shown in FIG. 6, the cord bush 1 is fixed to the cord port 12 when the insertion portion 3 is screwed until the side surface 4 a of the flange 4 abuts against the end surface of the cylindrical member 19 (the opening edge of the cord port 17). The

  The side surface 4a of the flange 4 of the cord bush 1 fixed in this manner is in close contact with the outer wall surface portion (opening edge) around the cord port 12 as shown in FIG. Each annular protrusion 9 receives the displacement in the reduced diameter direction of the cord insertion passage 3a generated when the male screw portion 5 of the insertion portion 3 is engaged with the female screw portion 18 of the cord port 17, and It is elastically brought into close contact (elastic deformation of the protrusion 9: present).

  As in the previous fitting type, the periphery of the cord port 12 is sealed by the flange 4, and the periphery of the cord 20 is sealed by the lip portion 9 a and the protrusion 9.

  Thereby, the cord bush 1 can seal the seal at the screw-type cord port 17, that is, the space between the outer peripheral surface of the cord 20 and the opening edge of the cord port 17 (providing drip-proofing or waterproofing).

  Thus, with only one type of cord bush 1, the fitting (fitting) type (through hole type) cord port 12 and the screw type (screw hole type) cord port 17 can be sealed.

  Therefore, since it is not necessary to prepare the cord bushes individually according to the shape of the cord mouth as in the prior art, the cord bushing can be easily managed. This is particularly effective for a device (for example, a water supply device configured by combining devices such as a motor and a control panel) in which a fitting type cord port 12 and a screw type cord port 17 are mixed. Moreover, since the cord bush 1 is made of rubber, it can be easily assembled to the cord port 12 and the cord port 17 by utilizing elastic deformation. In addition, since the rubber member has an excellent property of insulation, it is excellent in electrical safety.

  Further, since the annular groove 8 of the cord bush 1 is a groove stepped below the root diameter of the external thread portion 6, when assembling the cord bush 1 into the fitting type cord port 12, The opening edge of the mouth 12 can be fitted, and sufficient support rigidity of the cord bush 1 can be secured.

  In addition, in the cord insertion passage 3a, as the insertion portion 3 is attached to the cord openings 12 and 17, the annular projection 9 that is in close contact with the outer surface of the cord is formed. Here, even if the sealing performance at the lip portion 9a becomes insufficient, it is possible to prevent water from entering through the cord insertion passage 3a.

  The present invention is not limited to the above-described embodiment, and various modifications may be made without departing from the spirit of the present invention. For example, in one embodiment, a cord bush suitable for mounting a fitting type cord port formed on the wall surface of the casing of the control panel and a screw type cord port formed on the terminal box of the motor is given as an example. Needless to say, the present invention is not limited to this, and a cord bush that is also used as a plug-in type cord port or a screw type cord port of another device may be used.

FIG. 3 is a perspective view showing a cord bush according to an embodiment of the present invention together with a cord that passes through the bush. The side view which carried out partial cross section of the cord bush. The perspective view explaining when sealing the code | cord led out from the insertion-type code | cord | chord port formed in the housing | casing with a cord bush. Sectional drawing which follows the B-arrow view in FIG. The perspective view explaining when sealing the code | cord led out from the screw-type code | cord | chord port formed in the terminal box with a cord bush. Sectional drawing which follows the C-arrow view in FIG. Sectional drawing which shows the conventional cord bush.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Code bush, 2 ... Main body (bush main body), 3 ... Insertion part, 3a ... Code insertion path, 4 ... Flange, 6 ... Male thread part, 8 ... Circular groove, 9 ... Circular protrusion, 9a ... Lip part, 12 ... Fitting type cord port, 13, 20 ... Cord, 17 ... Screw type cord port.

Claims (4)

An insertion portion that can be inserted into a cord port through which the cord is inserted, a flange that is formed at a rear end portion of the insertion portion and that can be in close contact with an opening edge of the cord port, and is formed over the entire length of the insertion portion. An elastically deformable bushing body having a cord insertion passage for allowing insertion while sealing
A male screw part for screwing and mounting formed on the outer peripheral surface of the insertion part,
A cord bushing comprising: an annular groove for fitting and fitting formed in an outer peripheral portion on the rear end side of the insertion portion following the male screw portion.   The annular groove is formed by an annular groove in which an outer peripheral portion of an insertion portion from a rear end portion of the male screw portion to a side surface of the flange is stepped to a diameter dimension equal to or less than a valley diameter of the male screw portion. The cord bush according to claim 1, wherein   The inner peripheral surface of the cord insertion passage has an annular protrusion that comes into close contact with the outer peripheral surface of the cord as the bushing body is attached to the cord opening. Cord bushes.   The cord bush according to claim 1, wherein the bush body is made of rubber.

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