JP2007220540A - Terminal block and lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a terminal block 15 capable of maintaining the stability of the earth connection between a device body 11 and an earth terminal 22 made by tightening an earth screw 23 even if a terminal block body 21 shrinks under a heat effect. <P>SOLUTION: The earth terminal 22 housed in the terminal block body 21 is provided with an earth screw fitting portion 46. The earth screw fitting portion 46 has an earth screw fitting hole 48 in which the earth screw 23 penetrating the device body 11 is screwed, and a pair of contact portions 49 in contact with the device body 11. The contact of the paired contact portions 49 with the device body 11 maintains the tightening force of the earth screw 23 even if the terminal block body 21 shrinks under a heat effect, thus maintains the stability of the earth connection between the device body 11 and the earth terminal 22 by the earth screw 23. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a terminal block provided with a ground terminal that is grounded to an apparatus side using a ground screw, and a lighting fixture using the terminal block.

  2. Description of the Related Art Conventionally, for example, a terminal block used in a lighting fixture has a terminal block main body composed of a synthetic resin body and a cover, and grounds the lighting fixture together with positive and negative power terminals in the terminal base main body. A grounding terminal is housed.

  The cover is formed with a mounting surface that is mounted to face the fixture body of the lighting fixture, and a ground screw insertion hole through which a ground screw is inserted is formed in the mounting surface portion of the cover. The ground terminal is formed with a ground screw mounting portion having a ground screw mounting hole into which the ground screw inserted through the ground screw insertion hole of the cover is screwed.

A terminal block is arranged on the inner surface side of the instrument body, and a ground screw is screwed into the ground terminal from the outer surface of the instrument body through the ground screw insertion hole of the terminal block body, and the cover is sandwiched between the instrument body and the ground terminal. By tightening the ground screw, a plurality of protrusions provided on the head of the ground screw are bitten so that they are peeled off and electrically connected even when the surface of the instrument body is coated. Therefore, by tightening the ground screw, the head of the ground screw is pressed against the instrument body with the cover sandwiched between the instrument body and the ground terminal, and the instrument body and the ground terminal are grounded through the ground screw. At the same time, the terminal block is attached to the instrument body (see, for example, Patent Document 1).
JP-A-9-102216 (page 3-6, FIG. 12)

  However, the terminal block attached to the fixture body is affected by the heat when the lamp is lit and the heat transmitted from the lighting device through the fixture body, and the terminal block body is made of synthetic resin such as nylon resin The terminal block body may contract due to the influence of heat.

  When the terminal block body shrinks, the plate thickness of the cover mounting surface interposed between the instrument body and the ground terminal becomes thin, so the tightening force by the ground screw is reduced, thereby reducing the ground terminal There is a risk that the contact force between the head and the instrument body is reduced, and the stability of the ground connection cannot be ensured.

  The present invention has been made in view of such points, and even if the terminal block body contracts due to the influence of heat, the stability of the ground connection between the device side and the ground terminal by tightening the ground screw is ensured. An object is to provide a terminal block that can be maintained, and a lighting fixture using the terminal block.

  The terminal block according to claim 1 has a mounting surface portion that is mounted facing the device side, and the mounting surface portion is provided with a ground screw insertion hole through which a ground screw is inserted from the device side. A terminal block main body provided with a contact portion insertion hole in the vicinity of the ground; and a ground provided with a ground screw mounting hole into which a ground screw housed in the terminal block main body and inserted into the ground screw insertion hole of the mounting surface portion is screwed And a grounding terminal that has a contact portion that contacts the device side through the contact portion insertion hole of the mounting surface portion and is grounded to the device side by tightening the ground screw. .

  The terminal block body is made of, for example, a synthetic resin having an insulating property such as nylon resin, and may be composed of a body and a cover, and may contain a power supply terminal in addition to a ground terminal. A grounding wire, a power supply wire, or the like is inserted from the outside of the terminal block main body and electrically connected to the grounding terminal, the power supply terminal, and the like housed in the terminal block main body. In addition, the ground terminal is made of, for example, a metal having conductivity and spring property, and integrally has a ground wire locking terminal portion structure that holds and holds the ground wire inserted into the terminal block body in an electrically connected state. You may do it. The contact portion of the ground terminal may be flush with the outer surface of the mounting surface portion or may protrude from the outer surface of the mounting surface portion as long as the ground terminal is in contact with the device side by tightening the ground screw. The contact portion of the ground terminal is preferably provided at a plurality of positions centering on the ground screw mounting hole of the ground screw mounting portion, and further at a plurality of positions on a straight line passing through the center of the ground screw mounting hole, More preferably, they are provided at the same distance from the center of the ground screw mounting hole. The contact portion of the ground terminal may be provided at a location of the ground terminal other than the ground screw mounting portion. In addition, the ground screw has a general screw structure with a head and a screw part, and even if there is paint on the head side, a plurality of protrusions are provided so that it can be peeled off and electrically connected It could be

  The terminal block according to claim 2 has a terminal block body having a mounting surface portion that is mounted facing the device side, and a ground screw insertion hole through which a ground screw is inserted from the device side; A ground screw mounting part that is housed in the base body and has a ground screw mounting hole in which a ground screw that is inserted into the ground screw insertion hole of the mounting surface part is screwed, and supports the ground screw mounting part and tightens the ground screw. A grounding terminal that has an elastic support portion that biases the grounding screw mounting portion that moves to the device side to the opposite side with respect to the device side, and that is grounded to the device side by tightening the grounding screw; It is.

  The elastic support part of the ground terminal is elastically deformed when the ground screw mounting part moves to the equipment side by tightening the ground screw, and the ground screw mounting part is attached to the opposite side to the equipment side by the repulsive force due to this elastic deformation. Energize the grounding screw mounting part to the opposite side to the equipment side.

  The terminal block according to claim 3 includes a terminal block body having a mounting surface portion that is mounted facing the device side, and a ground screw insertion hole through which a ground screw is inserted from the device side on the mounting surface portion; The ground screw mounting part, which is housed in the base body and is inserted into the ground screw insertion hole of the mounting surface part, and the earth screw mounting hole provided with the ground screw mounting hole, is in contact with either the device side or the mounting surface part. And a ground terminal that has an elastic contact portion that biases the ground screw mounting portion in the opposite direction with respect to the device side, and is grounded to the device side by tightening the ground screw.

  The elastic contact portions of the ground terminal are preferably provided at a plurality of positions centered on the ground screw mounting hole, and moreover, at a plurality of positions on a straight line passing through the center of the ground screw mounting hole, More preferably, they are provided at the same distance from the center.

  The lighting fixture according to claim 4 includes: a fixture main body; a terminal block according to any one of claims 1 to 3 attached to the fixture main body while being grounded; and a ground screw for grounding the terminal block to the fixture main body; It is equipped.

  According to the terminal block of claim 1, since the contact portion of the ground terminal contacts the device side through the contact portion insertion hole provided in the mounting surface portion of the terminal block body, the terminal block body is affected by heat. Even if the thickness of the mounting surface portion is reduced due to shrinkage, the tightening force of the ground screw is maintained, and the stability of the ground connection between the device side and the ground terminal by the ground screw can be reliably maintained.

  According to the terminal block of the second aspect, the elastic support portion of the ground terminal supports the ground screw mounting portion, and the ground screw mounting portion that moves to the device side by tightening the ground screw is attached to the opposite side to the device side. Therefore, even if the terminal block body contracts under the influence of heat, the tightening force of the ground screw is maintained, and the stability of the ground connection between the device side and the ground terminal by the ground screw can be reliably maintained.

  According to the terminal block of claim 3, since the elastic contact portion of the ground terminal is in contact with either the device side or the mounting surface portion and biases the ground screw mounting portion in the opposite direction to the device side, Even if the terminal block body contracts under the influence of heat, the fastening force of the ground screw is maintained, and the stability of the ground connection between the device side and the ground terminal by the ground screw can be reliably maintained.

  According to the lighting apparatus of claim 4, since the terminal block according to any one of claims 1 to 3 is connected to the apparatus main body with a ground screw, the stability of the earth of the apparatus main body can be reliably maintained. .

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  1 to 7 show a first embodiment, in which FIG. 1 is a front view of a ground terminal with a terminal block attached, FIG. 2 is a plan view of the ground terminal, and FIG. 3 is a perspective view of the ground terminal. 4 is a perspective view of the terminal block, FIG. 5 is a cross-sectional view of the terminal block, FIG. 6 is a plan view of the cover of the terminal block, and FIG. 7 is a perspective view of the lighting fixture with the terminal block attached.

  FIG. 7 shows a ceiling-embedded luminaire as a device, and this luminaire includes a metal fixture body 11 that is a chassis having an open bottom surface. A pair of lamp sockets 12 are mounted to face each other, and two straight tube fluorescent lamps 13 as lamps are connected between the lamp sockets 12 at both ends in the longitudinal direction.

  A terminal block 15 and a lighting device (not shown) are mounted on the inner surface of the top plate portion 14 of the fixture body 11 between two straight tube fluorescent lamps 13 and have a substantially V-shaped cross section covering them. The reflector 16 is attached. The terminal block 15 is connected to a power line and a ground line drawn from the outside through a drawing hole 17 provided in the top plate part 14, and to an internal wiring drawn from the lighting device. The lighting device is connected to the lamp socket 12 by internal wiring. A plurality of positioning holes (not shown), a ground screw insertion hole 11a shown in FIG. 1, and the like are formed at the attachment position of the terminal block 15 of the instrument body 11.

  As shown in FIGS. 4 to 6, the terminal block 15 includes a terminal block main body 21, a pair of positive and negative power supply terminals (not shown) and a ground terminal 22 accommodated in the terminal block main body 21, and FIG. As shown in Fig. 2, the fixture body 11 and the ground terminal 22 are connected to the ground by being attached to the inner surface of the top plate portion 14 of the fixture body 11 by a ground screw 23 inserted from the outer surface side of the top plate portion 14 of the fixture body 11. Has been.

  The terminal block main body 21 is configured in a box shape with a body 26 and a cover 27 formed of an insulating resin material such as nylon resin. One side of the body 26 is opened, and the cover 27 is attached to cover the opening of the body, and includes a plurality of claw portions 28 formed on the side surface of the body 26 and a plurality of hole portions 29 formed on the side surface of the cover 27. The body 26 and the cover 27 are joined by the engagement.

  On one side surface of the body 26, two pairs of internal wiring insertion holes 30 into which internal wiring with a lighting device connected to the pair of power supply terminals and the like are inserted are formed. On the surface opposite to the cover 27 of the body 26, a pair of power supply line insertion holes 31 into which power supply lines connected to the pair of power supply terminals are inserted and a pair of feed wires to other lighting fixtures are inserted. And a pair of ground wire insertion holes 33 into which ground wires connected to the pair of ground terminals 22 are inserted. In the vicinity of each of the insertion holes 31, 32, 33, release operation portions 34, 35, 36 are formed for removing the respective wires inserted into the insertion holes 31, 32, 33 and connected to the corresponding terminals. Yes.

  The surface of the cover 27 opposite to the body 26 is formed as an attachment surface portion 37 that is attached to face the inner surface of the top plate portion 14 of the instrument body 11. A plurality of protrusions 38 that are positioned by engaging with a plurality of positioning holes (not shown) formed in the top plate portion 14 of the instrument body 11 are projected from the mounting surface portion 37, and the ground screw 23 is inserted therethrough. A ground screw insertion hole 39 is formed therethrough, and a pair of rectangular contact portion insertion holes 40 are formed in the vicinity of the ground screw insertion hole 39.

  Inside the body 26, a pair of power supply terminal accommodating portions (not shown) that accommodate a pair of power supply terminals are formed, and a ground terminal accommodating portion 41 that accommodates the ground terminal 22 is formed. The pair of power supply terminals and ground terminals 22 accommodated in the pair of power supply terminals and ground terminals 41 of the body 26 are held by being pressed by a cover 27 attached to the body 26.

  As shown in FIGS. 1 to 3, the ground terminal 22 is made of metal having conductivity and spring property, and has a substrate portion 43, and a pair of wire receiving portions 44 are formed from both side edges of the substrate portion 43. Is bent on one surface side of the substrate portion 43, and the locking portion 45 is formed on one surface of the substrate portion 43 from one edge portion that intersects both side edges provided with the pair of wire receiving portions 44 of the substrate portion 43. The ground screw mounting portion 46 is bent on the one surface side of the substrate portion 43 from the other edge portion.

  The locking part 45 is bent from the substrate part 43 at the center part, and a locking piece part 47 whose tip is close to the inner surface of each wire receiving part 44 is formed on both sides of the center part. The ends of each wire receiving portion 44 and each locking piece portion 47 are arranged inside each ground wire insertion hole 33 of the body 26, and the ground wire inserted from each ground wire insertion hole 33 is connected to each locking piece portion 47. The tip of each wire receiving portion 44 is pressed and electrically connected, and the tip of each locking piece 47 bites into the ground wire to hold the ground wire in place, that is, the ground wire locking terminal portion. The structure is integrally formed with the ground terminal 22.

  The ground screw mounting portion 46 is opposed in parallel to the inner surface of the mounting surface portion 37 of the cover 27 while being accommodated in the terminal block main body 21. A ground screw mounting hole 48 is formed in the center of the ground screw mounting portion 46 at the same axial center position as the ground screw insertion hole 39 of the cover 27 and is smaller in diameter than the male screw of the ground screw 23 and into which the ground screw 23 is screwed. A pair of contact portions 49 are bent at substantially right angles on both sides of the ground screw mounting portion 46 so as to directly contact the instrument body 11 through the contact portion insertion holes 40 of the mounting surface portion 37 of the cover 27. . The ground screw mounting portion 46 and the pair of contact portions 49 are formed in a substantially U-shaped cross section. The contact portion 49 has a rectangular shape including the plate thickness as viewed from the front end side, and a clearance of about 0.2 mm is provided between the contact portion 49 and the contact portion insertion hole 40 through which the contact portion 49 is inserted.

  The tips of the pair of contact portions 49 may protrude from the outer surface of the mounting surface portion 37 even if they are flush with the outer surface of the mounting surface portion 37 as long as they are in contact with the instrument body 11 by tightening the ground screw 23. The position of the pair of contact portions 49 is a position on a straight line passing through the center of the ground screw mounting hole 48 of the ground screw mounting portion 46, and is provided at the same distance from the center of the ground screw mounting hole 48. Incidentally, the positions of the pair of contact portion insertion holes 40 of the mounting surface portion 37 are also formed corresponding to the positions of the pair of contact portions 49.

  The ground screw 23 has a head 51 and a threaded portion 52, and a plurality of projections 53 having a triangular pyramid shape, for example, protrude from the surface of the head 51 facing the instrument body 11. The threaded portion 52 is a tapping screw and is chromated so as to have good ground conductivity.

  Next, the operation of the first embodiment will be described.

  In the assembled state of the terminal block 15, the pair of power terminals and the ground terminals 22 are arranged in the pair of power terminal accommodating portions and the ground terminal accommodating portion 41 of the body 26, and the pair of power terminals is covered by the cover 27 attached to the body 26. The earth terminal 22 is held between the body 26 and pressed.

  The tip of each wire receiving portion 44 and each locking piece portion 47 of the ground terminal 22 is disposed inside each ground wire insertion hole 33 of the body 26, and the middle portion of each locking piece portion 47 of the release operation portion 36. Arranged inside, the ground screw mounting hole 48 of the ground screw mounting portion 46 is disposed opposite to the ground screw insertion hole 39 of the cover 27, and each contact portion 49 of the ground screw mounting portion 46 is inserted through each contact portion of the cover 27. The hole 40 is inserted and arranged.

  Then, in order to attach the terminal block 15 to the instrument body 11, the attachment surface portion 37 of the cover 27 is made to face the inner surface of the instrument body 11, and each protrusion 38 protruding from the attachment surface portion 37 is formed in the instrument body 11. Engage with each positioning hole for positioning. In the state where the terminal block 15 is positioned and arranged, as shown in FIG. 1, the axis centers of the ground screw insertion hole 11 a formed in the instrument body 11 and the ground screw insertion hole 39 of the mounting surface portion 37 coincide.

  Insert the screw portion 52 of the ground screw 23 into the ground screw mounting hole 48 of the ground terminal 22 from the outer surface side of the tool body 11 through the ground screw insertion hole 11a of the tool body 11 and the ground screw insertion hole 39 of the cover 27. The screw 23 is turned in the screwing direction, the screw portion 52 is screwed while cutting the screw into the ground screw mounting hole 48, and the ground screw 23 is tightened.

  By tightening the ground screw 23, the instrument body 11 and the ground terminal 22 move so as to be relatively close to each other, and the tips of the pair of contact portions 49 of the ground terminal 22 directly contact the instrument body 11, and the ground terminal The fixture body 11 is fixed between the pair of contact portions 49 of 22 and the head portion 51 of the ground screw 23. At this time, even if the plurality of protrusions 53 protruding from the head 51 of the ground screw 23 have paint on the outer surface of the tool body 11, they are peeled off so as to be electrically connected.

  Therefore, by tightening the ground screw 23, the head 51 of the ground screw 23 is pressed against the instrument body 11 in a state where the instrument body 11 is sandwiched between the head 51 of the ground screw 23 and the ground terminal 22, and the grounding is performed. The instrument body 11 and the ground terminal 22 are grounded through the screw 23, and the terminal block 15 is attached to the instrument body 11.

  Since the pair of contact portions 49 of the ground terminal 22 are in direct contact with the instrument body 11 through the contact portion insertion holes 40 provided in the mounting surface portion 37, the heat during lighting of the straight tube fluorescent lamp 13 is reduced. Even if the mounting surface portion 37 of the cover 27 contracts due to the heat transmitted from the lighting device through the fixture body 11 and the thickness t of the mounting surface portion 37 decreases, the tightening force of the ground screw 23 can be maintained. The stability of the ground connection between the instrument body 11 and the ground terminal 22 by the ground screw 23 can be reliably maintained.

  In addition, the position of the pair of contact portions 49 is provided on the straight line passing through the center of the ground screw mounting hole 48 of the ground screw mounting portion 46, and at the same distance from the center of the ground screw mounting hole 48. Therefore, the clamping force by the ground screw 23 is well balanced, the contact balance with the instrument body 11 is also good, and it is not affected by external force such as when connecting the ground wire to the ground terminal 22, and a stable contact state is obtained. be able to.

  In addition, if the ground screw is strongly screwed in and the terminal block is fixed, the ground screw mounting portion receives a strong screwing torque and is liable to be twisted, but each contact portion 49 has a contact portion insertion hole 40 in the cover 27. It is possible to prevent torsional deformation by abutting against the inner surface.

  Next, FIGS. 8 to 10 show a second embodiment, in which FIG. 8 is a plan view of the ground terminal of the terminal block, FIG. 9 is a front view of the ground terminal, and FIG. 10 is a side view of the ground terminal.

  Instead of the contact portion 49 of the ground terminal 22 of the first embodiment, a contact portion 61 is bent at the tip position of the ground screw mounting portion 46 and the ground screw mounting portion 46 of the substrate portion 43 is formed. A pair of abutment portions 62 are integrally formed extending from the substrate portion 43 at positions on both sides of the bent edge portion. Each contact portion insertion hole 40 is formed in the attachment surface portion 37 of the cover 27 in correspondence with the positions of the contact portions 61 and 62.

  Also in this case, the same effect as the first embodiment can be obtained.

  Next, FIG. 11 shows a third embodiment, and FIG. 11 is a side view of the ground terminal with the terminal block attached.

  The ground terminal 22 is formed by cutting and raising a belt-like elastic support portion 65 through a pair of slits on the substrate portion 43, and the ground screw mounting portion 46 is supported by the elastic support portion 65. The elastic support portion 65 is connected to the ground screw mounting portion 46 from the inclined portion 66 bent at an obtuse angle so as to be inclined from the substrate portion 43 to one surface side of the substrate portion 43, and from the tip of the inclined portion 66. It has a bent portion 67 bent at an acute angle.

  Then, the screw portion 52 of the ground screw 23 is inserted into the ground screw mounting hole 48 of the ground terminal 22 from the outer surface side of the tool body 11 through the ground screw insertion hole 11a of the tool body 11 and the ground screw insertion hole 39 of the cover 27. The ground screw 23 is rotated in the screwing direction and screwed into the ground screw mounting hole 48 with the screw portion 52, and the ground screw mounting portion 46 is elastically deformed while the elastic support portion 65 of the ground terminal 22 is elastically deformed. Moves to the instrument body 11 side. Therefore, the elastic support portion 65 of the ground terminal 22 biases the ground screw mounting portion 46 that moves to the instrument body 11 side by tightening the ground screw 23 to the opposite side with respect to the instrument body 11 side.

  Therefore, by tightening the ground screw 23, the head 51 of the ground screw 23 is pressed against the instrument body 11 by the elasticity of the elastic support portion 65 of the ground terminal 22, and the instrument body 11 and the ground terminal 22 are brought into contact with the instrument body 11 through the ground screw 23. The terminal block 15 is attached to the instrument body 11 while being grounded.

  And since the elastic support portion 65 of the ground terminal 22 urges the ground screw mounting portion 46 that moves to the instrument body 11 side by tightening the ground screw 23 to the opposite side to the instrument body 11 side, a straight tube fluorescent lamp Even if the mounting surface portion 37 of the cover 27 contracts and the thickness t of the mounting surface portion 37 decreases due to the effect of heat generated when the lighting device 13 is turned on or heat transmitted from the lighting device through the fixture body 11, the ground screw 23 Thus, the stability of the ground connection between the instrument body 11 and the ground terminal 22 by the ground screw 23 can be reliably maintained.

  Next, FIGS. 12 and 13 show a fourth embodiment. FIG. 12 is a side view of the ground terminal with the terminal block attached, and FIG. 13 is a front view of the ground terminal with the terminal block attached. is there.

  The ground terminal 22 has a pair of elastic contact portions 71 that contact the inner surface of the mounting surface portion 37 of the cover 27 from the substrate portion 43 on both sides of the edge where the ground screw mounting portion 46 of the substrate portion 43 is bent. It is extended and formed integrally.

  The pair of elastic contact portions 71 are formed so as to be inclined in the same direction as the ground screw mounting portion 46, and when the ground terminal 22 is accommodated in the ground terminal accommodating portion 41 of the body 26 and the cover 27 is attached. A repulsive force is applied to abut against the inner surface of the mounting surface portion 37 of the cover 27 and elastically deform to urge the ground terminal 22, that is, the ground screw mounting portion 46, in the opposite direction to the mounting surface portion 37 side.

  The tip of the pair of elastic contact portions 71 is positioned on a straight line passing through the center of the ground screw mounting hole 48 of the ground screw mounting portion 46, and at the same distance from the center of the ground screw mounting hole 48. It is configured to contact the inner surface of the surface portion 37.

  Then, the screw portion 52 of the ground screw 23 is inserted into the ground screw mounting hole 48 of the ground terminal 22 from the outer surface side of the tool body 11 through the ground screw insertion hole 11a of the tool body 11 and the ground screw insertion hole 39 of the cover 27. Then, the ground screw 23 is rotated in the screwing direction, and the screw portion 52 is screwed into the ground screw mounting hole 48 while cutting the screw.

  Therefore, by tightening the ground screw 23, the head 51 of the ground screw 23 is pressed against the instrument body 11, and the instrument body 11 and the ground terminal 22 are grounded through the ground screw 23, and the terminal block 15 is connected to the instrument body 11. Attached to 11.

  And, since the elastic contact portion 71 of the ground terminal 22 abuts on the mounting surface portion 37 of the cover 27 and has a repulsive force that biases the ground screw mounting portion 46 in the opposite direction with respect to the instrument body 11 side, The mounting surface portion 37 of the cover 27 contracts and the plate thickness t of the mounting surface portion 37 decreases due to the influence of heat generated when the straight fluorescent lamp 13 is turned on or heat transmitted from the lighting device through the instrument body 11. However, the tightening force of the ground screw 23 can be maintained, and the stability of the ground connection between the instrument body 11 and the ground terminal 22 by the ground screw 23 can be reliably maintained.

  Next, FIG. 14 shows a fifth embodiment, and FIG. 14 is a side view of the ground terminal with the terminal block attached.

  In the fourth embodiment, the tip of the elastic contact portion 71 of the ground terminal 22 is configured to directly contact the instrument body 11. In this case, an opening 72 through which the elastic contact portion 71 is inserted is formed in the attachment surface portion 37 of the cover 27, and the tip of the elastic contact portion 71 protrudes outward from the attachment surface portion 37 through the opening 72.

  Then, by disposing the terminal block 15 on the inner surface of the instrument body 11, the tip of the elastic contact portion 71 comes into direct contact with the inner surface of the instrument body 11. Insert the screw portion 52 of the ground screw 23 into the ground screw mounting hole 48 of the ground terminal 22 from the outer surface side of the tool body 11 through the ground screw insertion hole 11a of the tool body 11 and the ground screw insertion hole 39 of the cover 27. By rotating the screw 23 in the screwing direction and screwing it in the ground screw mounting hole 48 with the screw portion 52, the elastic contact portion 71 that comes into direct contact with the inner surface of the instrument body 11 is elastically deformed and grounded. A repulsive force that urges the terminal 22, that is, the ground screw mounting portion 46 in the opposite direction with respect to the instrument body 11 side is applied.

  Therefore, by tightening the ground screw 23, the head 51 of the ground screw 23 is pressed against the instrument body 11, and the instrument body 11 and the ground terminal 22 are grounded through the ground screw 23, and the terminal block 15 is connected to the instrument body 11. Attached to 11.

  And since the elastic contact portion 71 of the ground terminal 22 directly contacts the inner surface of the instrument body 11 and has a repulsive force that biases the ground screw mounting portion 46 in the opposite direction to the instrument body 11 side, The mounting surface portion 37 of the cover 27 contracts and the plate thickness t of the mounting surface portion 37 decreases due to the influence of heat generated when the straight fluorescent lamp 13 is turned on or heat transmitted from the lighting device through the instrument body 11. However, the tightening force of the ground screw 23 can be maintained, and the stability of the ground connection between the instrument body 11 and the ground terminal 22 by the ground screw 23 can be reliably maintained.

It is a front view of the ground terminal in the attachment state of the terminal block which shows the 1st Embodiment of this invention. It is a top view of a ground terminal same as the above. It is a perspective view of a ground terminal same as the above. It is a perspective view of a terminal block same as the above. It is sectional drawing of a terminal block same as the above. It is a top view of the cover of a terminal block same as the above. It is a perspective view of the lighting fixture which attached the terminal block same as the above. It is a top view of the ground terminal of the terminal block which shows the 2nd Embodiment of this invention. It is a front view of a ground terminal same as the above. It is a side view of a ground terminal same as the above. It is a side view of the ground terminal in the attachment state of the terminal block which shows the 3rd Embodiment of this invention. It is a side view of the ground terminal in the attachment state of the terminal block which shows the 4th Embodiment of this invention. It is a front view of the ground terminal in the attachment state of a terminal block same as the above. It is a side view of the ground terminal of the attachment state of the terminal block which shows the 5th Embodiment of this invention.

Explanation of symbols

11 Instrument body
15 Terminal block
21 Terminal block
22 Earth terminal
23 Ground screw
37 Mounting surface
39 Ground screw insertion hole
40 Abutment insertion hole
46 Ground screw mounting
48 Ground screw mounting hole
49, 61, 62 Contact part
65 Elastic support
71 Elastic contact part

Claims (4)

There is a mounting surface portion that is mounted facing the device side, and the mounting surface portion is provided with a ground screw insertion hole through which a ground screw is inserted from the device side, and a contact portion insertion hole is provided in the vicinity of the ground screw insertion hole. A terminal block body provided;
It is housed in the terminal block body and is connected to the equipment side through a ground screw mounting portion provided with a ground screw mounting hole into which a ground screw inserted into a ground screw insertion hole in the mounting surface portion is inserted, and a contact portion insertion hole in the mounting surface portion. An earth terminal having an abutting part to be abutted and connected to the equipment side by tightening an earth screw;
A terminal block comprising: A terminal block body having a mounting surface portion that is mounted facing the device side, and a ground screw insertion hole through which a ground screw is inserted from the device side;
A ground screw mounting portion that is housed in the terminal block body and has a ground screw mounting hole into which the ground screw that is inserted into the ground screw insertion hole on the mounting surface portion is screwed, and supports the ground screw mounting portion and tightens the ground screw. A grounding terminal that has an elastic support portion that biases the grounding screw mounting portion that moves to the device side to the device side, and is grounded to the device side by tightening the grounding screw;
A terminal block comprising: A terminal block body having a mounting surface portion that is mounted facing the device side, and a ground screw insertion hole through which a ground screw is inserted from the device side;
Abuts against either the ground screw mounting portion, the equipment side, or the mounting surface portion provided with a ground screw mounting hole that is housed in the terminal block body and that engages with the ground screw inserted into the ground screw insertion hole of the mounting surface portion. A grounding terminal that has an elastic contact portion that biases the grounding screw mounting portion in the opposite direction to the device side and is grounded to the device side by tightening the grounding screw;
A terminal block comprising: An instrument body;
The terminal block according to any one of claims 1 to 3, wherein the terminal block is attached to the instrument body by being grounded;
A ground screw for grounding the terminal block to the fixture body;
The lighting fixture characterized by comprising.

Images