JP2009187917A - Plug for lighting duct with independent grounding electrode - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plug for a lighting duct with an independent grounding electrode at minimal additional cost by commonizing components with components of a two-pole structure duct plug, its additional function device and the like. <P>SOLUTION: In this plug, by focusing attention on a wire connection terminal part of a general non-grounding type 2P duct plug located lower than an opening surface, and presence of a sufficient space between terminals, a grounding pin 4h and a plate spring 4j using a plate spring material are arranged in its narrow space; a wide fixation board is arranged at a position with the plate spring 4j extended and lifted; an insulation tube covering the circumference of an assembly screw 7 is made to penetrate therethrough; and a connection terminal part 4a tilted by being connected to the fixation board is arranged. The plug is structured such that, by focusing attention on a space left between the fixation board lifted from the opening and the lower side of the terminal part, a U-shaped rib having a resin spring function for rotation stop is arranged in a back-side space of the connection terminal part, and a slide guide is arranged in order to prevent the lift of a rotation stop upper part. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is a three-pole (3P) plug with a grounding electrode that can be attached to a lighting duct with a grounding electrode installed on a normal indoor ceiling and wall and can simultaneously hold and electrically connect a lighting fixture or the like. The present invention relates to a configuration structure and an arrangement structure of an independent ground electrode.

  A plug for a lighting duct is mainly incorporated in a lighting fixture such as a spotlight or a hanging type, and is often used as a built-in fixture, and is generally called a duct plug. Hereinafter, it is also referred to as a duct plug in the text.

  In recent years, the diversification of light sources has progressed due to demands for improving the efficiency of lighting fixtures, and the replacement of conventional incandescent bulbs with high-efficiency small and low-output fluorescent lamps and high-pressure discharge lamps has progressed. In order to light these lamps, electronic ballasts are often used to reduce the size and weight, and the output is often high voltage depending on conditions, and grounding may be required for safety measures. Many.

  As a measure for this, a new installation construction of a lighting duct with a grounding electrode has been carried out in advance, and the duct plug is also grounded in addition to the non-grounded two-pole structure (hereinafter referred to as 2P). There is a need to supply a tripolar structure with poles (hereinafter referred to as 3P).

  On the other hand, with the reduction in size and weight of lighting fixtures, 3P duct plugs are increasingly required to be miniaturized in the same manner as in the past, and are further required to be supplied as simple and low-priced products.

  In response to these requirements, the applicant passes the assembly screw through the ground terminal, provides a connection terminal portion in the immediate vicinity thereof, places the power supply terminal at the bottom of the resin molded body, and places the connection terminal portion at the apex portion. The invention proposes a structure that is provided in a space to secure an insulation distance (see Patent Document 1).

  However, the structure is difficult to secure the insulation distance because the assembly screw penetrates the center part of the grounding terminal, but there is no problem in the concept of "miscellaneous earth" with a metal housing etc. as part of the grounding circuit, A structure corresponding to so-called “independent earth”, which is an independent ground for making the ground circuit independent, could not be realized.

  In addition, the present applicant has proposed a resin spring structure that utilizes the physical properties of the resin material of the rotation stopper instead of the spring for vertically moving the rotation stopper having a locking function for the rotation operation (see Patent Document 2).

  The above resin spring structure requires appropriate structural design and resin molding technology. However, coil springs that are intertwined and require extra effort during assembly work can be handled easily and can be used for automatic assembly. It is said.

  The repulsive force in a compressed state exceeding about 10,000 hours is also maintained at 65 to 70%, and the operation function at the time of normal mounting thereafter is not abnormal, and has been confirmed to have sufficient practical performance. .

  In order to realize the supply of a simple and inexpensive 3P plug having a solid performance and function, a structure capable of satisfying both of these structures and functions is desirable.

  In view of the problem of the previous paragraph, the independent grounding structure and the resin spring structure of the rotation stop are embodied, the cylindrical cross section equivalent to the existing 2P duct plug is embodied, and the parts and the additional function devices are shared. It is an object to realize a 3P duct plug with an independent grounding pole that is miniaturized as much as possible and to provide it with a minimum additional cost.

Means to solve the problem

  The present invention pays attention to the position and shape of the fixing portion through which the assembly screw of the grounding terminal of the previous invention is penetrated, covers the periphery of the assembly screw in a cylindrical shape with a molding resin, and arranges the through hole base of the grounding terminal outside thereof. Adopt structure.

  The overall shape of the grounding terminal is a grounding pin formed by rounding at one end, using a leaf spring with an insulating member and a movable gap between the AC power supply terminals, and the remainder being an approximate material width. A bent portion that is partially narrowed to be freely bent in the plate thickness direction and a substantially J-shaped leaf spring portion that is connected to the bent portion are provided, and a leaf spring portion mainly for elastic action is provided. A through hole is provided to allow the body assembly screw and the insulating member to pass through, a terminal portion for connecting the electric wire connected to the tip of the fixing portion is provided, and the fixing portion and the terminal portion are provided at an upper limit position as high as possible from the opening surface of the housing. At the same time, the terminal portion is inclined and installed three-dimensionally.

  A U-shaped rib having a resin spring function for preventing rotation is disposed in the space behind the connection terminal portion of the ground terminal, and a sliding guide is provided in order to prevent the upper portion of the rotation stopper from being lifted.

The invention's effect

  The greatest effect of the present invention is that the independent grounding structure and the movable structure of the rotation stop by the resin spring can be embodied in the minimum number of parts and the minimum space volume, and provide the maximum functions with a simple structure. It is possible to do that.

  By finishing the existing 2P duct plug with the same diameter, it is possible to share existing parts, minimizing investment in molds for newly generated parts, etc., and a great economic effect.

  The appearance design can be unified with the ungrounded 2P duct plug, and the horizontal mounting reinforcement provided as an additional function can be shared, providing the same design and usability, and the application range as a duct plug Will spread.

  With the ground terminal and the support structure of the present invention, the contact in the sliding direction between the ground pin portion and the duct plug casing is only a point contact, and the movement is less aggravated by contact with the casing and twisting or twisting. Keeping stable contact without becoming.

  The three-dimensional arrangement of the grounding terminal makes it easy to secure the insulation creepage distance and insulation space distance from the charged part, and restricts the movable range of the round crimping terminal used for connection and prevents inadvertent degradation of insulation. The in-instrument electric wire of the ground terminal that is pulled out obliquely downward can be easily processed by inducing the in-apparatus wiring by guiding the inside of the instrument around the bottom half.

  It is easy to deal with the case grounding as a conventional “miscellaneous grounding”, and there is no inconvenience or unnecessary cost increase due to the provision of the independent grounding function. In having

  In general, only a grounding terminal and a grounding terminal screw are needed, and a small, lightweight, simple 3P duct plug with an independent grounding pole can be realized, and high-quality products that anticipate the conformity to international standards are provided at low cost. It can be done.

  The present invention is best applied to a 3P duct plug with a grounding electrode, which is used by being incorporated in a lighting duct illuminator using a small compact fluorescent lamp or a small high pressure discharge lamp as a light source.

  The grounding electrode according to the present invention is not limited to the structure in which the entire duct plug housing is rotated and detached because of its structure, but the grounding pin of the grounding electrode is positively slid during attachment / detachment and use. It is not intended to be used.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  In general, a duct plug is divided into two parts, a relatively large one assembled with a plurality of screws, and a central portion so that it can be assembled and assembled with a lighting fixture or the like. There is a small one assembled with a set of assembly screws and nuts, and the present invention relates to the latter ground terminal installation structure.

  FIG. 1 is a perspective view of a 3P duct plug with an independent grounding electrode according to the present invention viewed obliquely from below, and shows a mounting state of a connection terminal portion 4a with an external electric wire or the like of a grounding terminal 4 and an outline of a fixed portion.

  FIG. 2 is a perspective view of the same state as viewed obliquely from above, showing an outline of the housing structure of the ground pin portion 4h and the J-shaped leaf spring portion 4j of the ground terminal 4 and the stepped boss 1w of the insulating pipe.

  The duct plug housing is formed by splitting a substantially cylindrical housing in half, and plug body 1 incorporating main parts and grounding terminal 4 by tightening assembly screws 7 covering them. The plug lid 2 is sandwiched and held at a predetermined position.

  As shown in FIG. 3, the plug main body 1 has a pair of power supply terminals 3 and power supply terminal screws 5 attached in the same position and the same structure as an existing 2P duct plug, and is added as a 3P duct plug in the center portion. 4 and a ground terminal screw 6 are attached.

  The power terminal 3 includes a contact end 3c that contacts the conductor of the lighting duct, a leaf spring 3d that generates the contact pressure, a terminal 3b that has a screw hole at the other end, and a fixing claw 3a above and below the terminal 3b. It is assembled and fixed by press-fitting into the power terminal fixing hole 1a provided in the plug body.

  Since the terminal portion 3b of the power supply terminal 3 shared with the 2P duct plug needs to have the center midpoint of the pair of contact end portions 3c as the rotation center of the duct plug, it sinks from the opening surface of the plug body 1 due to its structure. It is an arrangement.

  FIG. 4 is an exploded perspective view showing the mounting structure of the rotation stopper 10. It is a structure that is fitted to the plug body 1 and operates up and down, and the head always protrudes and is caught at both ends of the opening of the lighting duct to prevent the rotation from coming off.

  The U-shaped rib 10c extended from the base of the rotation stopper 10 is deformed only for a short time to function as a spring, taking advantage of the physical properties peculiar to the molding material. When the rib tip 10e is hooked on the plug body 1, it functions to prevent the plug body 1 from coming off while being deformed and bendable throughout the rib.

  Originally, the U-shaped rib 10c alone is arranged in the center portion of the U-shaped rib 10c, and the insertion hole 1ac of the plug body 1 is set within the movable restriction range, so that the U-shaped rib 10c alone can be positioned in three directions. Is ideal.

  However, in this example, since it is necessary to arrange the J-shaped leaf spring portion 4j and the U-shaped bent portion 4f of the ground terminal 4 in the optimum portion, the lower side corresponding to the back side of the terminal portion 4a of the ground terminal 4 Provided in position.

  For this reason, in particular, there is a possibility that the balance in the front-rear direction is lost and the upper end part is lifted, and it is unstable with respect to the load in the left-right direction, that is, the rotational torque during operations such as attachment / detachment work and adjustment of the irradiation direction There is a risk of becoming.

  In order to prevent this, a sliding rib 10a folded back is provided, and the plug body 1 is provided with a sliding guide rib 1ah and a stepped groove 1s. The sliding rib 10a is caught by the sliding guide rib 1ah to prevent the floating.

  Further, in order to facilitate the hooking and pushing operation when the rotation stopper 10 is incorporated into the plug body 1, a sliding slope 1aj is provided on the sliding guide rib 1ah. The momentary deformation load at the time of press-fitting is reduced by turning the tip of the sliding rib 10a of the rotation stopper 10 along the fitting slope 1aj.

  The rotation stopper 10 is assembled after the hexagon nut 8 is inserted into the nut hole 1 t provided in the plug body 1.

  For the assembly work of the rotation stopper 10, first, the folded portion 10d of the U-shaped rib 10c that functions as a spring is inserted into the insertion hole 1ac of the plug body 1 by about half.

  Next, the rotation stopper is lifted upward, and the sliding rib 10a is hooked on the sliding guide rib 1ah of the plug body 1 to be slid into the fitting slope 1aj.

  Finally, the rotation stopper 10 is pushed into the plug body 1 to press fit, and the attachment is completed. The sliding rib 10a is received in the stepped groove 1s of the plug body 1, and the sliding guide rib 1ah is the groove portion 10b of the rotation stopper 10. The rib tip 10e of the U-shaped rib 10c is inside the insertion hole 1ac and is hooked on the R surface 1ae that prevents the U-shaped rib 10c from being removed, and is assembled at a proper position.

  When the sliding rib 10a is hooked or press-fitted into the plug body 1, the characteristic properties of the molding material that allows a short-time transient deformation are fully utilized.

  Further, the utilization of this characteristic property is also utilized when the U-shaped rib 10c is used as a spring. Accordingly, in particular, the molding process of the rotation stopper needs to reproduce not only the dimensional shape but also the characteristic physical properties of the molded resin material.

  The attached rotation stopper 10 is always pushed upward by an initial reaction force in a state where the U-shaped rib 10c is slightly bent.

  At the time of attachment to the lighting duct, the rotation stopper 10 is pushed down. However, the U-shaped rib 10c is bent and the sliding rib 10a and the sliding guide rib 1ah act to absorb the movable stopper 10 at a predetermined position. Then, after the attachment, the initial state of fine deformation is restored, and no mechanical load that causes deformation is applied.

  In addition to the above basic structure, the present invention is characterized by the structure of the ground terminal 4, the structure of the plug main body 1 that accommodates it, and the structure of the stepped boss 1w that enables independent grounding.

  In order to make the most of the internal space of the plug body 1, the grounding terminals 4 are arranged in a three-dimensional manner, so that the insulation space distance that is insufficient on a plane is sufficient in the three-dimensional perspective view direction. The distance can be secured.

  The ground terminal 4 is installed by utilizing a gap existing between the pair of power supply terminals 3, and the feature is that the leaf spring material is used and the assembly screw 7 is penetrated so that the connecting terminal portion is connected to the end in the longitudinal direction. And inclined at a position higher than the opening surface of the plug body 1.

  The movable part of the grounding terminal 4 shown in FIG. 5 includes a grounding pin part 4h in which the tip part of the leaf spring material is formed in a substantially tubular shape, a J-shaped leaf spring part 4j having a U-shaped bent part 4f, and the width of the leaf spring. Is partly reduced to lower the rigidity, thereby forming a bent portion 4g that can be freely bent in a limited range in the thickness direction.

  The vertical movement of the ground pin portion 4h when the duct plug is attached is transmitted to the J-shaped leaf spring portion 4j through the bent portion 4g and is applied as a bending load of the leaf spring, and the repulsive force is applied to the tip of the ground pin portion 4h. Provides effective contact pressure.

  The J-shaped leaf spring portion is connected to the grounding pin portion 4h located substantially at the center at the bent portion 4g, and the other is connected to the terminal portion 4a set at a position that is largely raised above the opening surface. In the middle of this, there is a fixing base 4n that is provided with a through hole 4e for passing the assembly screw 7 and the stepped boss 1w that becomes an insulating member, and that serves as a base for fixing the terminal.

  The through holes 4e are raised by drawing with the edges facing upward to form circular reinforcing ribs 4k to compensate for strength reduction due to insufficient material width of the fixed base 4n. This substantially circular tubular reinforcing rib 4k eliminates the need to unnecessarily increase the material width, which helps to secure an insulation distance.

  Since the reinforcing rib 4k of the through hole 4e naturally has a curved surface on the side opposite to the rising direction, it serves to fix the ground terminal.

  Since the ground terminal 4 is inserted into the stepped boss 1w of the plug body 1, the press-fitting ribs 1wa are provided at a plurality of locations of the stepped boss 1w so as to function as a fixing means after press-fitting, and the ring shape on the opposite side of the reinforcing rib 4k. The curved surface is used as a guide for press-fitting.

  FIG. 6 is an exploded perspective view showing an arrangement structure of the power supply terminal 3 and the ground electrode 4 which is a feature of the present invention. Both terminals are assembled and fixed to the main body by a press-fitting structure.

  The power terminal 3 is assembled by press-fitting the fixing claws 3 a into the power terminal fixing holes 1 a of the plug body 1.

The grounding terminal 4 is partitioned by the pin holder convex portion 1ea, the insulation reinforcing rib 1aa and the outer peripheral rib 1x of the plug body 1 into an independent insulating space, and the grounding pin portion 4h, the U-shaped bent portion 4f, and the J-shaped leaf spring portion 4j.
The terminal portion 4a is inserted into the stepped boss 1w with the through hole 4e of the grounding terminal 4 being dropped from above, and the grounding pin portion 4h and the fixing base 4n are press-fitted to complete the assembly and fixing.

  The ground pin portion 4h to be press-fitted is set close to the pin holder convex portion 1ea and slightly spaced from the diameter of the ground pin at the time of insertion, and comes into contact with the pin pressing rib 1k. And temporary fixing is completed by expanding and contracting by the action of mutual slope and curved surface by the pressing force at the time of press-fitting.

  The through-hole 4e is inserted into the stepped boss 1w and then pushed into the press-fitting rib 1wa to complete the assembly and fixing.

  By inserting and press-fitting the through-hole 4e, the terminal portion 4a has the latch pieces 4b provided at both ends of the inclined surface within the corner formed by the outer peripheral rib 1x and the rotation limiting rib 1o, and is press-fitted to accommodate the terminal. It is fixed in close contact with the inclined surface 1n. The fixed base 4n is in close contact with the upper surface of the support rib 1am and fits in a predetermined position.

    The fixed base 4n is fixed by a press-fitting rib 1wa, and the terminal portion 4a is prevented from being lifted by a latching piece 4b and a rotation limiting rib 1o.

  With this structure, the attachment of the ground terminal 4 is completed when it is vertically press-fitted from the opening surface, and the tensile strength of the terminal portion 4a is dispersed by a tilt angle of about 40 degrees, and the yield strength is improved.

  The stop surface 1p provided on the center side of the rotation braking rib 1o stops the rotation of the round crimping terminal used at the time of connecting the electric wire at an optimum angle for the processing of the internal wiring, and the round shape used for the power supply terminal 3 It plays the role of ensuring the insulation space distance by preventing the contact with the crimp terminal.

  Although this structure is suitable for independent grounding, a case grounding structure is often adopted for reasons such as facilitating wiring work and assembly work with an instrument. Especially in Japan, the idea of the housing structure is the mainstream.

  A pipe grounding piece 16 is prepared for housing grounding, and the contact part 16a is fastened to the terminal part 4a of the grounding terminal 4 through the terminal hole 16b to attach the contact part 16a to the rotating mechanism housing part. The instrument housing can be grounded by maintaining contact with the instrument mounting round nut 11 incorporated in 1j and 2j.

7 and 8 are cross-sectional views showing the arrangement structure of the grounding electrode 4 and the rotation stopper 10 according to the present invention. FIG. 7 shows the arrangement of a single item in a free state. FIG. And the compression state of the grounding terminal 4 after mounting | wearing is shown.
A standard nut nut 11 for mounting an instrument is incorporated in the lower rotating mechanism housing portions 1j and 2j.

  The ground terminal 4 support structure of the plug body 1 is configured so that the fitting position between the stepped boss 1w of the plug body 1 and the tapered surface 2m of the plug lid 2 is as much as possible in accordance with the shape and arrangement of the ground terminal 4. Set to 2 side.

  As a result, a sufficient J-shaped leaf spring portion 4j can be formed on the ground terminal 4, the insulation distance from the power supply terminal 3 can be secured, and further, the insulation creepage distance between the assembly screw 7 and the ground terminal 4 can be secured. Is possible.

  In order to ensure a sufficient insulation creepage distance between the ground terminal 4 and the power supply terminal 3, the movable rib of the J-shaped leaf spring portion 4j is restricted by expanding the insulating rib of the plug body 1 and forming the insulating reinforcing rib 1aa. In addition to smoothing the flow of the resin material in the molding process, it contributes to obtaining stable parts with sufficient strength by suppressing distortion during molding.

  The insulation reinforcing rib 1aa is in close contact with the terminal holding rib 2k provided on the plug lid 2 to maintain a predetermined reference dimension, and is held by the step 1ak without overloading the fixed base 4n of the ground terminal 4. .

  The ground terminal 4 is press-fitted into the stepped boss 1w so that the step 1ak and the support rib 1am are mounted and fixed together, and when the plug cover 2 is assembled at the time of assembly, the movable restriction is limited when the terminal terminal rib 2k is lifted. Has been made.

  In order to secure the insulation creepage distance, a tapered surface 1wb is provided at the tip of the stepped boss 1w projected from the reinforcing rib 4k of the ground terminal 4, and a tapered surface 2m is also provided at the fitting portion of the plug lid 2, It is used as a guide when working in combination.

  The fixed base 4n and the terminal portion 4a of the ground terminal 4 are connected to the stepped boss 1w and are in close contact with the upper surface and the inclined surface 1n of the support rib 1y divided to the left and right in order to avoid the ground terminal screw 6, and the latch piece 4b. Is close to the rotation restricting rib 1o and is surrounded by the outer peripheral rib 1x.

  The outer peripheral rib 1x and the bottom thereof are supported by the support rib 1y, and a space 1q necessary for processing the in-apparatus wiring connected to the power supply terminal 3 is secured under the bottom.

  The space between the support ribs 1y is a space that accommodates the tips of the ground screw hole 4d and the ground terminal screw 6, and is also a valuable space in which the spring function of the rotation stopper 10 can be installed.

  The U-shaped rib 10c of the rotation stopper 10 is incorporated through the insertion hole 1ac of the plug body 1, and the rib tip 10e is hooked to the R surface 1ae.

  In the compressed state in which the rotation stopper 10 is pushed down, the U-shaped rib 10c is greatly bent and the fitting angle of the rib tip 10e is changed, so that the center of rotation sliding with the R surface 1ae may be deviated and removed. A taper surface 1af continuous with the surface 1ae is provided to take measures against dropout.

  By tilting the terminal portion 4a of the ground terminal 4, the latching piece 4b is restrained by the rotation restricting rib 1o against lifting around the bent portion 4m of the fixed base 4n, and the terminal portion 4a is connected to the terminal portion 4a. With respect to the vertical load, it is possible to increase the load bearing strength by loading the stepped boss 1w and the rotation limiting rib 1o as an inclined load.

  The angle is set so as to avoid contact with the structural protrusion of the plug lid 2 when the ground terminal screw 6 of the terminal portion 4a is loosened to the maximum.

  Further, when the grounding terminal screw 6 is tightened independently, it is set so that the tip of the screw does not come into contact with the stepped boss 1w and the folded portion 10d of the U-shaped rib 10c of the rotation stopper 10. An angle of about 40 degrees with respect to the opening surface of the plug body 1 is set.

  This angle should be adjusted and changed according to the dimensions of the opening surface of the plug body, the height of the terminal portion, the arrangement and number of assembly screws, the difficulty of workability, etc., and is not related to the angle of 40 degrees.

  When the duct plug is assembled, the plug body 1 and the plug lid 2 are tightened by the assembly screw 7 and the nut 8, and the ground terminal 4 having the through hole 4e is pressed from both sides leaving a step 1ak to be in a predetermined arrangement. For actual use.

  Since the fixed base 4n of the ground terminal has a minimum seating area due to the through hole 4e, the outer edge portion is supported as much as possible by the insulation reinforcing ribs 1aa and the supporting ribs 1am having the step 1ak, and the dimension of the step 1ak is increased. By providing, it is considered that the tightening strength of the assembly screw 7 does not affect the ground terminal 4.

  The reinforcing rib 2a and the terminal holding rib 2k of the plug lid 2 measure the dispersion of the tightening force of the assembly screw 7 into the plug lid 2, and are in direct contact with the insulation reinforcing rib 1aa and the stepped boss 1w of the plug body 1. Dispersion of the tightening force is measured, ensuring proper tightening allowance and preventing deformation due to excessive tightening, enabling balanced assembly.

  The ground pin 4h, which is a movable part of the ground terminal 4, is easily opened by the protrusion of the plug body 1 and the elastic repulsive force of the J-shaped leaf spring and the bent portion 4g. There is a possibility of rising from the part.

  As a countermeasure, a pin presser rib 1k is provided on the substantially central opening surface of the ground pin housing portion of the plug body 1 to prevent lifting from the opening surface.

  This pin presser rib 1k has an inclined surface with respect to the insertion direction from the opening surface, and by pressing the ground pin portion 1h, the pin presser rib 1k passes through the mutual widening and contraction and can be accommodated in the storage portion and temporarily fixed. .

  Forming is possible by providing a press-cut hole 1ab on the outside of the plug body 1, and there is no decrease in the insulation distance of the power terminal 3 with respect to a metal object that can be grounded, and the latching strength can be freely adjusted by the protruding width dimension of the pin presser rib 1k. It can be lifted up during the connection work of the in-apparatus wiring and does not cause any trouble.

  Further, a ground pin holder 2e is provided at the upper end of the plug lid 2. After the assembly is completed, the ground pin holder 2e is held at a predetermined position, and is kept in a predetermined shape and size of the ground terminal 4 and is not affected by the outside. .

  The grounding pin 4h of the grounding terminal 4 of the duct plug assembled in a proper state in an appliance or the like is held at the tip by the pin holder projections 1ea, 2ea of the plug body 1 and the plug lid 2, and the other end is It is held by the bent part 4g and positioned for vertical movement.

  The eccentric sliding resistance due to the rotation operation when the duct plug is attached works by using the pin holder convex portions 1ea and 2ea as a fulcrum by the lever principle, and the bending portion 4g has an eccentric sliding resistance of about 1/3 to 1/4. It is only transmitted, and sufficient support strength is obtained due to the high rigidity of the front, rear, left, and right due to the characteristics of the leaf spring that supports the bent portion.

  The bent portion 4g freely moves up and down with bending deformation together with the vertical movement of the ground pin portion 4h, transmits the movement to the J-shaped leaf spring portion 4J, and is absorbed as bending deformation of the leaf spring. Since it is necessary to move the U-shaped bent portion 4f greatly along with the deformation of the leaf spring, the contact portion of the plug body 1 is provided with an R-notch portion 1ag to expand the movable range.

  Since the bending deformation portion can be set to have a long effective length via the U-shaped spring portion 4f, the displacement of the bending portion 4g is kept to a minimum, and the influence on the tip of the ground pin portion 4h is about 1/3 by this principle. Reduced to ¼.

  Specifically, it is supported by the J-shaped leaf spring portion 4J, but in order to cause some deformation and displacement, the storage portion is provided with a sufficient gap and a smooth sliding wall surface, and if necessary, molding of reinforcing ribs And the rigidity strength can be adjusted by drilling holes.

  Further, in order to prevent excessive deformation and displacement of the J-shaped leaf spring portion 4J and the like, the plug body 1 and the plug lid 2 are provided with steady rests 1f and 2f to limit the displacement.

  FIG. 9 and FIG. 10 are perspective views showing an insulation strengthening measure for a portion having a minimum insulation distance in the conventional structure in consideration of the use of the specification with the ground terminal. The plug body 1 is provided with an insulation groove 1c, and the plug An insulating rib 2c is provided on the lid 2 so as to be fitted therewith.

  The insulating groove 1c and the insulating rib 2c have an insulation creepage distance from the outer shell when the power terminal screw 5 is lifted by tightening a crimp terminal having a thick power terminal screw 5 (for example, simultaneous use of a round crimp terminal, a flat washer, and a spring washer). In order to prevent the minimum, the insulating creepage distance is increased by the insulating rib 2c entering the insulating groove 1c.

  11 and 12 are perspective views showing the arrangement of components around the ground terminal and the insulation space distance between the components. FIG. 11 shows a case where terminals of conductive material are mounted and FIG. Only shows.

  In this structure, a predetermined insulation distance is secured by providing terminals in the vertical direction with respect to the opening surface of the plug body 1, and a cylindrical shape having the same shape as the 2P plug of the conventional structure. The ground terminal 4 having an independent ground structure is stored and installed with the same diameter.

  The dimensional difference with the 2P plug is the same diameter at Φ = 32, and is extended by 5 mm at L = 41 (compared to the company) with respect to L = 36. This is a dimension secured to increase the number of wirings by adding a grounding electrode and absorb the extra dimension necessary for work.

  This duct plug is provided with reinforcing protrusions 1h and 2h on the plug body 1 and the plug lid 2 to allow the use of a lateral mounting reinforcing tool. A hole 1b and a fitting guide pin 2b are provided.

  In particular, the fitting guide hole 1b provided in the upper part is integrated with the insulating groove 1c, and the fitting guide pin 2b is integrated with the insulating rib 2c, so that a stronger fitting and reinforcing effect can be exhibited.

The structure related to the reinforcing device in the lateral mounting and the hanging mounting has already been invented by the present inventor and has been filed by the present applicant. (See Patent Document 2 and Patent Document 3)
Japanese Patent Application No. 2007-75532 (FIGS. 1, 2, 5, and 6) JP 2007-134294 (Japanese Patent Application No. 2005-354086) JP 2007-35607 (Japanese Patent Application No. 2005-236112)

    It is a perspective view from diagonally below which shows the state which opened the duct plug by this invention.     It is a perspective view from the diagonal upper side which shows the state which opened the duct plug by this invention.     It is a front view of the plug main body which shows the installation structure of the power supply pole and ground electrode by this invention.     It is a disassembled perspective view which shows the attachment structure of the rotation stopper by this invention.     It is a perspective view which shows the structure and shape of the grounding electrode by this invention.     It is a disassembled perspective view of the plug main body which shows the installation structure of the ground pole and grounding piece by this invention.     It is sectional drawing which shows the installation structure of the grounding electrode by this invention, and shows a natural state.     It is sectional drawing which shows the operating state at the time of the movable compression of the earthing | grounding pole by this invention and a rotation stop.     It is a partial detailed perspective view which shows the insulation creeping distance expansion structure of the plug main body by this invention.     It is a partial detailed perspective view which shows the insulation creeping distance expansion structure of the plug lid by this invention.     It is a perspective view which shows the structure of the insulation distance ensuring of the power supply terminal and ground terminal by this invention.     It is a perspective view which shows the shaping | molding structure of the plug main body which is an insulation structure main body by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plug body 1a Power supply terminal fixing hole 1b Fitting guide hole 1c Insulation groove 1e Grounding pin holder 1ea Pin holder convex part 1f Stall 1g Hook 1h Reinforcement protrusion 1j Rotation mechanism accommodating part 1k Pin holding rib 1n Inclined surface 1o Turning restriction rib 1p Stop surface 1q Space 1s Stepped groove 1t Nut hole 1w Stepped boss 1wa Press-fitting rib 1wb Tapered surface 1x Outer peripheral rib 1y Strut rib 1z Duct fitting groove 1aa Insulation reinforcement rib 1ab Press hole 1ac Insert hole 1a R Stop piece 1a Surface 1af Tapered surface 1ag R notch 1ah Sliding guide rib 1aj Sloping guide rib 1ak Step difference 1am Support rib 2 Plug lid 2a Reinforcement rib 2b Fitting guide pin 2c Insulating rib 2e Grounding pin holder 2ea Pin holder convex part 2f Stud 2g Hook claw 2h Reinforcing protrusion 2j Rotation mechanism storage 2k terminal holding rib 2m taper surface 2z duct fitting groove 3 power supply terminal 3a fixing claw 3b terminal portion 3c contact end 3d leaf spring portion 4 ground terminal 4a terminal portion 4b latching piece 4d terminal screw hole 4e through hole 4f U-shape Bending part 4g Bending part 4h Grounding pin part 4j J-shaped leaf spring part 4k Reinforcement rib 4m Bending part 4n Fixed base 5 Power terminal screw 6 Grounding terminal screw 7 Assembly screw 8 Hexagon nut 10 Anti-rotation 10a Sliding rib 10b Groove part 10c U Rib 10d Folding part 10e Rib tip 11 Round nut 16 Pipe grounding piece 16a Contact part 16b Terminal hole

Claims (5)

  A pair of power supply terminals and grounding terminals are provided at the top of the case, and a coupling mechanism for equipment is provided at the lower end, and the cylindrical case is divided into two parts by a set of assembly screws and its associated devices provided at the center. In a three-pole duct plug with a grounding pole that is connected to and assembled with machinery and equipment so as to be openable and closable, a movable ground pin and a gorgeous leaf spring in a narrow space separated by an insulating wall between power terminals And a grounding terminal formed by inclining the connecting terminal part connected to a wide fixed base with a through hole that penetrates the insulating tube that surrounds the assembly screw. A grounding electrode plug for a lighting duct with a grounding electrode, comprising an independent grounding circuit structure by three-dimensionally securing a predetermined insulating space distance.   The anti-rotation device that protrudes from the opening of the lighting duct after installation and prevents the duct plug casing from being unintentionally rotated, making use of the basic physical properties of the molding material and extending from the anti-rotation body to make one end free. Forms a U-shaped resin spring function, inserts the resin spring part in a bent and compressed state from the insertion hole provided in the housing, and hooks the tip of the resin spring to the bottom of the insertion hole inside the housing to prevent it from coming off and movable An anti-rotation device for a duct plug, characterized in that   The U-shaped resin spring function movable mechanism of the anti-rotation device according to claim 2 is housed and installed in a space behind the connection terminal portion of the ground electrode installed at a position levitated from the power supply terminal. The plug with a grounding electrode for a lighting duct with a grounding electrode according to claim 1, wherein a sliding guide structure is provided on the upper part as an auxiliary movable mechanism.   A copper alloy strip for spring is used as the main material, and one end is formed into a circular tube rod by rounding to provide a contact pin as a grounding pin. As shown in the figure, a bent portion bent at a substantially right angle and a leaf spring portion formed in a substantially J-shape are formed, the other end of the leaf spring portion is connected to a wide fixing base, and the connecting terminal portion is inclined by connecting to each other. 2. The plug with a grounding electrode for a lighting duct with a grounding electrode according to claim 1, wherein the grounding terminal is integrally formed.   The edge of the through hole provided in the fixed base of the grounding electrode is raised to form a reinforcing rib to compensate for the strength reduction caused by drilling, and the curved surface of the reinforcing rib is used as a guide surface for insertion and press-fitting. 2. A lighting duct with a grounding electrode according to claim 1, wherein a fine rib for press-fitting and fixing is provided in the insulating tube to be penetrated, and the grounding electrode is press-fitted into the insulating tube to function as a built-in fixing device. Plug with grounding electrode.

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