JP5360557B2 - Screw mounting device, terminal block and lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screw mounting device for preventing scattering and transfer of chip powder produced by screwing of the screw. <P>SOLUTION: The screw mounting device 10 includes: a metallic member to be mounted 11 having a screw through-hole 11e; a support member 12 having a screw mounting hole 12a formed in opposition to the screw through-hole of the member to be mounted and forming a convex part 12b around the screw mounting hole; and a screw 13 loading and fixing the member to be mounted on the convex part of the support member, by being screwed into the screw through-hole and the screw mounting hole of the support member. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a screw mounting device for mounting a member to be mounted using a screw, for example, a terminal to a terminal block, a terminal block using the screw mounting device, and a lighting fixture.

  2. Description of the Related Art Conventionally, for example, a terminal block used in a lighting fixture or the like contains a ground terminal for grounding the lighting fixture together with a power supply terminal in the terminal block. For example, as shown in Patent Document 1, the ground terminal has a substrate portion having conductivity and spring property, and a ground screw mounting portion is integrally formed on the substrate portion, and the ground screw is formed on the mounting portion. A mounting hole having a smaller diameter than that of the male screw is formed and accommodated in the terminal block body. When grounding a lighting fixture, support the terminal block on the chassis of the fixture body and screw the ground screw into the mounting hole so that the chassis made of metal is sandwiched between the ground screw mounting portion and pulled into the ground terminal. Electrical connection with the connected ground wire constitutes a ground connection.

JP 2007-220540 A

  As shown in paragraphs [0032] and [0037] of Patent Document 1, generally, tapping screws are used as the ground screws used for these ground connections, and mounting of a ground screw mounting portion made of metal is used. Screw in the hole while cutting. For this reason, fine chips are generated when the screw is cut. There is a risk that the swarf moves in the terminal block and adheres to a charging part such as a power supply terminal in the terminal block, leading to a decrease in electrical insulation.

 This is likely to occur when using a tapping screw, but even when a ground screw with a male screw formed in advance is screwed into a mounting hole with a female screw formed, for example, when the screw is tilted and forcibly screwed, As a result, the thread will be shaved and a problem of generating chips will occur. In addition, the adverse effects of chips are not only a problem of electrical insulation degradation, but also in various fields, for example, in precision machines such as watches, chips enter mechanical operating mechanisms such as gears and cause failures. Causes a variety of problems.

 The present invention has been made in view of the above problems, and provides a screw mounting device capable of preventing the scattering movement of chips generated by screwing of a screw, thereby preventing the possibility of a decrease in electrical insulation. It is intended to provide a possible terminal block and luminaire.

The invention of the screw attachment device according to claim 1 includes a metal attached member having a screw insertion hole; a screw attachment hole formed facing the screw insertion hole of the attachment member; A support member having a convex portion formed so as to form a space around the support member; and screwing the screw into the screw insertion hole of the member to be attached and the screw attachment hole of the support member into the convex portion of the support member. And a screw for mounting and fixing. According to the present invention, there is provided a screw mounting device capable of preventing the scattered movement of chips caused by screwing of a screw by a support member having a convex portion formed so as to form a space around the screw mounting hole. Composed.

  In the present invention, the screw mounting device is applied to electrical equipment such as a terminal block and a lighting fixture, and it is preferable to prevent electrical insulation deterioration, but it is applied to various various equipment such as precision machines such as watches. be able to. Therefore, the mounted member in the present invention is applied to any device to be applied, for example, an electric device or a precision machine, and all components attached to the support member by screws are applied. Moreover, all the support structures, such as a support stand for attaching a to-be-attached member with a screw, are also applied to a support member.

  The screw is preferably a tapping screw, but may be a screw in which a male screw is formed in advance. Therefore, the screw insertion hole of the mounted member and the screw mounting hole of the support member are formed with holes that do not have a female screw in advance, and even those that are screwed in while tapping with a tapping screw are configured with holes that are formed with a female screw in advance. However, a screw in which a male screw is formed in advance may be screwed in.

  The metal mounted member, when applied to a terminal of an electric device, may be composed of a plate material having conductivity and spring properties, such as copper, aluminum, stainless steel, or an alloy of these metals. Although preferred, the present invention is applied to devices other than electric devices, and may be composed of a metal having low conductivity instead of being conductive.

The convex portion formed so as to form a space around the screw mounting hole is preferably formed so as to cover the entire periphery of the screw mounting hole. What formed the slit and the small hole may be sufficient, and the essential point should just be the convex-shaped part of the structure which can prevent the scattering movement of a chip. Further, the convex portion may be formed integrally with the support member, or may be configured by integrating the convex portion formed separately into the support member by fixing means such as adhesion or screwing. .

 According to a second aspect of the present invention, in the screw mounting device according to the first aspect, the mounted member has a protruding portion that protrudes from the screw insertion hole toward the screw mounting hole, and a tip of the protruding portion is It is on the screw mounting hole side from the tip of the convex portion.

  According to the present invention, the protrusion has a protrusion that protrudes from the screw insertion hole toward the screw attachment hole, and since the tip of the protrusion is closer to the screw attachment hole than the tip of the protrusion, the protrusion and the protrusion The parts overlap each other, and the scattering movement of the chips caused by screwing can be prevented.

The invention of the terminal block according to claim 3 is a metal ground terminal having a screw insertion hole and to which a ground wire is connected; a screw formed of a synthetic resin and facing the screw insertion hole of the ground terminal A support base having a mounting hole and having a convex portion formed so as to form a space around the screw mounting hole; a ground screw screwed into the screw insertion hole of the ground terminal and the screw mounting hole of the terminal block; And a terminal base body that houses an electrical component having a grounding terminal and a charging unit disposed adjacent to the grounding terminal.

According to the present invention, the screw of the ground terminal capable of preventing the scattering movement of the chips generated by screwing of the screw by the support base having the convex portion formed so as to form the space around the screw mounting hole. An attachment device is comprised and the terminal block which can prevent the possibility of an electrical insulation fall can be comprised.

  It is preferable that the support base made of synthetic resin and the terminal block body in which the support base is formed integrally are made of polybutylene terephthalate (PBT) such as white, but those made of other synthetic resins such as nylon resin It may be. The electrical component having the charging unit arranged adjacent to the ground terminal is preferably configured with, for example, a power supply terminal, a feeding terminal, and the like, but the components configuring the charging unit are limited to the power supply terminal and the like. Instead, any other electrical component may be used.

  The invention of the lighting apparatus according to claim 4 is characterized by comprising: an apparatus main body; and the terminal block according to claim 3 arranged on the apparatus main body.

According to the first aspect of the present invention, it is possible to prevent the scattering of chips generated by screwing of the screw by the support member in which the convex portion is formed so as to form a space around the screw mounting hole. A screw attachment device can be provided.

According to the second aspect of the present invention, the protrusion of the screw protrudes from the screw insertion hole toward the screw mounting hole and the support base having the convex portion formed so as to form a space around the screw mounting hole. It is possible to provide a screw mounting device capable of preventing the scattering movement of chips generated by screwing.

According to the third aspect of the present invention, it is possible to prevent scattering of chips generated by screwing of the screw by the support base in which the convex portion is formed so as to form a space around the screw mounting hole. A ground terminal screw mounting device is configured, and a terminal block capable of preventing the possibility of a decrease in electrical insulation can be provided.

  According to invention of Claim 4, since the terminal block of Claim 3 was used, the lighting fixture which can prevent the possibility of an electrical insulation fall can be provided.

The screw attachment apparatus of 1st Embodiment of this invention is shown, (a) is sectional drawing which follows the AA line of FIG.4 (b), (b) is a perspective view of a ground terminal. The screw attachment apparatus is shown similarly, (a) is sectional drawing, (b) is sectional drawing which shows the state where the height of a convex-shaped part is low. The perspective view of the terminal block using the screw attachment apparatus of 1st Embodiment of this invention. Similarly, showing the terminal block, (a) is a bottom view of the cover, (b) is a top view of the body, (c) is a top view showing a state in which the ground terminal is removed in (b), with a part cut away, (D) is an equivalent view of (b) showing a state in which chips are scattered and adhered to adjacent power supply terminals. The perspective view which cuts off one part and shows the lighting fixture using the terminal block of 1st Embodiment of this invention. Sectional drawing which shows the modification of the screw attachment apparatus in 1st Embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a screw attachment device according to the present invention, a terminal block using the screw attachment device, and a lighting fixture will be described with reference to the drawings.

  This embodiment constitutes a screw mounting device used for a terminal block of a lighting fixture using a fluorescent lamp as a light source. First, the configuration of the screw mounting device will be described. The screw mounting device of the present embodiment constitutes a grounding screw mounting device 10 for grounding used for a terminal block of a lighting fixture. As shown in FIG. 1, a ground terminal 11 which is a mounted member of the present invention, Similarly, the support base 12 constituting the support member and the ground screw 13 constituting the screw of the present invention for fixing the ground screw mounting device to the mounted portion of the lighting fixture are constituted.

  As shown in FIG. 1 (b), the ground terminal 11 is a terminal constituting a double fast connection terminal, and has a thickness of about 0.4 mm made of a conductive metal, which is a copper alloy in this embodiment. The board portion 11a is made of a flat plate material that is thin and rigid and exhibits a strong spring property when bent. The board portion 11a is disposed along the vertical direction in a terminal block 20 described later, and 3 on the same surface side of the board portion. An electric wire receiving plate 11b, a locking plate 11c, and a mounting plate 11d that are bent at right angles from each direction are provided. And the core wire of the ground wire W1 is inserted between the wire receiving plate 11b and the locking plate 11c, and is locked and connected.

 The mounting plate 11d is integrally formed by bending the other end portion of the substrate portion 11a. A screw insertion hole 11e into which the ground screw 13 is screwed is formed at the center of a substantially square plate material, and a fixing piece 11f is provided on one side. It is formed by being bent together. The screw insertion hole 11e integrally forms a screw margin portion 11e1 as a protruding portion protruding downward by burring the mounting plate 11d made of a plate material (FIG. 2A). The screw insertion hole 11e including the screw allowance is configured as a through hole having a substantially circular cross section that does not form a female screw on the inner surface of the hole. The diameter of the hole is smaller than the diameter of the ground screw 13.

 The ground screw 13 is constituted by a tapping screw that is slightly larger than the diameter of the screw insertion hole 11e in the ground terminal 11, and is screwed into the screw insertion hole 11e while cutting the screw. In addition, chromate treatment is performed to improve grounding conductivity.

 The ground terminal 11 and the ground screw 13 thus configured are incorporated into the terminal block 20 to constitute the ground screw mounting device 10 for grounding. That is, as shown in FIGS. 3 and 4, the terminal block 20 includes a terminal block main body 21 having a wire insertion hole, the one ground terminal 11 arranged in the terminal block main body, and the charging unit in the invention. It comprises three power supply terminals 14 as electrical components.

  The terminal block main body 21 is formed in a box shape with a body 22 and a cover 23 made of synthetic resin each having an insulating property, in this embodiment, white polybutylene terephthalate (PBT), and the outer surface of the cover 23 will be described later. It is comprised as the attachment surface 24 to the instrument main body 31 of the instrument 30. FIG. The body 22 is opened to the cover 23 side, and the cover 23 is attached so as to cover the opening of the body 22. Between the body 22 and the cover 23, an earth terminal accommodating portion 25 for accommodating one earth terminal 11 is formed in the terminal block main body 21, and close to and adjacent to the earth terminal accommodating portion. Three power terminal accommodating portions 26 for accommodating the power terminals 14 are formed.

 The ground terminal housing portion 25 is formed with a housing portion 25a for housing the mounting plate 11d of the ground terminal 11, and the support base 12 for fixing the ground terminal is integrally formed in the housing portion. The support base is integrally formed with a screw mounting hole 12a facing the screw insertion hole 11e of the ground terminal 11, and a convex portion 12b having a ring shape is integrally formed around the screw mounting hole. The screw mounting hole 12a is configured as a hole having a bottom with a substantially circular cross section that does not form a female screw on the inner surface of the hole. The diameter of the hole is formed to be smaller than the diameter of the ground screw 13, and the ground screw 13 made of a tapping screw is screwed in while cutting the screw.

 On the convex portion 12b having a ring shape, the back surface of the mounting plate 11d having the substantially square shape of the ground terminal 11 described above is placed, and in this state, the entire periphery is surrounded by the back surface of the mounting plate 11d and the inner surface of the convex portion 12b. A space portion p serving as a storage space for the chips surrounded so as to be covered is formed. As shown in FIG. 2 (a), the height dimension a of the convex portion 12b is larger than the height dimension b of the screw allowance 11e1 (a> b), the bottom surface of the space p and the lower end of the screw allowance 11e1 A gap s is formed between the protrusions 12 and the screw allowance 11e1 that is the protruding portion and the convex portion 12b overlap. Furthermore, the axis of the screw insertion hole 11e of the ground terminal 11 and the screw attachment hole 12a of the support base 12 coincide with each other, and the lower end of the screw insertion hole 11e of the attachment plate 11d communicates with the space portion p.

  In the figure, reference numeral 25b denotes an accommodating portion for accommodating the wire receiving plate 11b and the locking plate 11c of the ground terminal 11. Further, the three power terminals 14 are accommodated in a power terminal accommodating part 26 provided adjacent to the ground terminal accommodating part 25. In this state, as shown in FIG. 4B, the ground terminal 11 and the three power terminals 14, that is, the charging unit are accommodated in the body 22 adjacent to and adjacent to the ground terminal 11.

 The mounting surface 24, which is the outer surface of the cover 23, is formed by penetrating an opening 23a into which the mounting plate 11d and the fixed piece 11f of the ground terminal 11 are fitted, and the surface of the mounting portion 11d is formed from this opening. Is slightly protruded and exposed. Thereby, the surface of the mounting plate 11d is configured to come into contact with the chassis 31a of the fixture body when the lighting fixture 30 is installed.

  Also, one side surface of the body 22 is formed with one wire insertion hole 22a into which the core wire of the ground wire W1 is inserted corresponding to the ground terminal 11, and corresponds to each of the three power supply terminals 14. The three electric wire insertion holes 22b into which the core wires of the power supply line W2 are inserted are respectively formed.

  Further, as shown in FIG. 3, a pair of internal wirings corresponding to each of the three power supply terminals 14 are inserted into the other side surface of the body 22 opposite to the one side surface where the wire insertion holes are formed. Electric wire insertion holes 22c are respectively formed. In the figure, 22d is one release button portion for removing the ground wire W1 connected to the ground terminal 11, and 22e is three release button portions for removing the power wire W2 connected to the power terminal 14. is there.

 As described above, the cover 22 is covered with the body 22 containing the ground terminal 11 and the power supply terminal 14, and the plurality of claw portions 22 f formed on the side surface of the body and the plurality of hole portions 23 f formed on the side surface of the cover 23. The body and the cover are connected to each other by being engaged with each other (FIG. 3).

 In this state, the mounting plate 11d and the fixing piece 11fb of the ground terminal 11 are fitted into the opening 23a formed in the mounting surface 24 of the cover 23, and the surface of the mounting portion 11d of the ground terminal slightly protrudes from the opening. Exposed.

 Next, the terminal block 20 having the ground terminal 11 configured as described above is incorporated into the lighting fixture 30. That is, as shown in FIG. 5, the lighting fixture 30 includes a metal fixture body 31 that is a chassis embedded in a ceiling and has an open bottom surface, and two sets of lamp sockets 32 are provided at both longitudinal ends of the fixture body. Two straight tube fluorescent lamps 33 as lamps are connected between the respective lamp sockets at both ends in the longitudinal direction. The above-described terminal block 20 and a lighting device (not shown) are attached to the inner surface of the top plate portion 34 of the appliance main body 31 between the two straight tube fluorescent lamps 23, and a cross-sectional view covering them is omitted. A V-shaped reflector 36 is attached.

 As for the lighting fixture 30 of the said structure, the terminal block 20 is attached to the fixture main body 31 at the time of the manufacture. At this time, the attachment portion 11 d of the ground terminal 11 protrudes from the opening 23 a and is in contact with the chassis 31 a of the instrument body 31. In this state, the axial centers of the insertion hole 31b formed in advance in the chassis, the screw insertion hole 11e of the ground terminal 11, and the screw mounting hole 12a of the support base 12 are aligned.

 Then, the ground screw 13 is inserted into the screw insertion hole 11e of the ground terminal from the insertion hole 31b of the chassis 31a, and screwed into the inner surface of the screw allowance 11e1 of the screw insertion hole 11e by the action of the tapping screw. Then, the tip of the tapping screw is screwed into the screw mounting hole 12a of the support base 12 while cutting the screw.

 Thereby, the support stand 12, that is, the terminal stand 20 is drawn toward the chassis 31 a side of the instrument main body 31, and the surface of the attachment portion 11 d of the ground terminal 11 contacts the chassis 31 a. At the same time, the chassis 31 a is sandwiched between the ground screw 13 and the ground terminal mounting plate 11 d, and electrical contact is made via the ground screw 13, and the terminal block 20 is attached to the instrument body 31.

 At this time, since the tapping screw is screwed into the inner surface of the screw allowance 11e1 of the screw insertion hole 11e made of metal, chips are generated. This swarf falls into the space portion p from the screw insertion hole 11e. The space portion p is closed by the ring-shaped convex portion 12b and the back surface of the mounting plate 11d, and the screw allowance 11e1 as the projecting portion and the convex portion 12b overlap, so that the space p is scattered without moving outside. Housed in part p.

 Incidentally, when there is no convex portion and no space is formed, the chips k are scattered and moved into the terminal block body 21 as shown in FIG. In the unlikely event that there is a reduction in insulation between the different poles due to adhesion between the three power supply terminals 14 housed, there is a risk of a short circuit phenomenon.

 Further, since a gap s is formed between the bottom surface of the space portion p and the lower end of the screw margin 11e1 of the mounting plate 11d, the chips are surely dropped and stored in the space portion p from the gap s. . Incidentally, when the height dimension a of the convex portion 12b is equal to or smaller than the height dimension b of the screw allowance (a ≦ b), the back surface of the mounting plate 11d and the convex portion 12b as shown in FIG. A gap t is formed between the upper end of the swarf and swarf is scattered and moved out of the gap.

 Further, since the ground screw 13 is screwed in a state where the back surface of the mounting plate 11d having a substantially square shape of the ground terminal 11 is placed on the ring-shaped convex portion 12b, the mounting plate 11d is not inclined. The convex portion 12b is pulled toward the chassis 31a side of the instrument main body 31, and the attachment portion 11d contacts and is attached to the chassis 31a.

 As described above, the internal wiring W3 drawn out from the lighting device through the wiring hole 37 is connected to the terminal base 20 attached to the equipment main body 31 and the ground terminal 11 connected to the equipment main body. Inserting from 22c and connecting to the power terminal 14 respectively, wiring in the instrument body is performed. Next, the luminaire 30 that has been internally wired and completed as described above is installed on the ceiling or the like, and the ground wire W1 and the power supply wire W2 that are external wires are inserted from the wire insertion holes 22a and 22b, respectively, The power terminal 14 is connected to connect the lighting fixture 30 to the power source and the ground.

 As described above, according to the present embodiment, the ground screw 13 of the ground terminal 11 is constituted by a tapping screw, and chips generated by screwing the tapping screw into the screw insertion hole 11e made of metal are scattered outside. Without being moved, the ring-shaped convex portion 12b and the ground terminal mounting plate 11d are closed by the back surface and accommodated in the space p where the protruding portion 12b and the screw portion 11e1 overlap with the convex portion 12b. There is provided a ground terminal screw mounting device 10 that can prevent scattering of chips and dust.

  As a result, the chips are prevented from being scattered and moved into the terminal block main body 21 and are not attached to the power supply terminal 14 in the terminal block main body, that is, the charging portion in the terminal block main body. The terminal block 20 which can prevent the insulation fall in between is comprised, By using this terminal block, the safe lighting fixture 30 which prevented the possibility of the insulation fall can be provided. In particular, as described above, it is possible to prevent swarf from moving and scattering, so that it is not necessary to increase the insulation distance between the different poles of the terminal serving as the charging unit, and the terminal block 20 can be reduced in size. .

  In addition, since a gap s is formed between the bottom surface of the space portion p and the lower end of the screw margin 11e1 of the ground terminal mounting plate 11d, the chips are surely dropped into the space portion p and stored. Since it does not leak, it is possible to reliably prevent the swarf from moving into the terminal block main body 21 or the like.

 Further, as described above, the convex portion 12b of the support base 12 has an effect of forming the space portion p for storing the chips, and mounts the mounting plate 11d having a substantially square ground terminal without inclination. The mounting plate is also tilted, and the grounding can be reliably performed by making the surface contact with the chassis 31a of the lighting fixture 30 without tilting the mounting plate.

 As described above, in the present embodiment, the ground screw 13 is constituted by a tapping screw. However, as shown in FIG. 6, it may be constituted by using a screw in which a male screw 13a is previously formed. In this case, a female screw 12a1 into which a ground screw can be screwed is formed in the screw insertion hole 11e of the ground terminal 11 and the screw mounting hole 12a of the support base 12. In this case, mainly when the ground screw is inserted obliquely and forcibly screwed to generate chips, it is possible to prevent the chips from being scattered. In this case, the screw mounting hole 12a of the support base 12 may be configured by embedding a female screw portion made of a metal such as brass integrally when the support base 12 is molded with resin. According to this, the screwing of the ground screw can be performed reliably, a reliable grounding can be achieved, and the terminal block 20 can be supported to the lighting fixture 30 reliably and firmly.

  As shown in the figure, a plurality of triangular pyramid-shaped protrusions 13b are formed on the back surface of the head of the ground screw 13, and when the ground screw is screwed, the protrusion 13b bites into and contacts the chassis 31a. Thus, more reliable electrical connection may be performed.

 In FIG. 6 showing the modification, the same parts as those in FIGS. 1 to 5 are denoted by the same reference numerals, and detailed description thereof is omitted. The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and can be applied to, for example, a screw mounting device for electrical equipment, and does not depart from the gist of the present invention. Various design changes can be made within the range.

10 Screw mounting device 11 Mounted member (ground terminal)
11e Screw insertion hole 12 Support member (support stand)
12a Screw mounting hole 12b Convex part 13 Screw (ground screw)
14 power supply terminal 20 terminal block 21 terminal block body 30 lighting fixture 31 fixture body

Claims (4)

A metal mounting member having a screw insertion hole;
A support member having a screw mounting hole formed to face the screw insertion hole of the mounted member, and having a convex portion formed so as to form a space around the screw mounting hole;
A screw for mounting and fixing the mounted member on the convex portion of the supporting member by being screwed into the screw insertion hole of the mounted member and the screw mounting hole of the supporting member;
A screw mounting device comprising: The mounted member has a protruding portion that protrudes from the screw insertion hole toward the screw mounting hole, and the tip of the protruding portion is located closer to the screw mounting hole than the tip of the convex portion. The screw mounting device according to claim 1. A metal ground terminal having a screw insertion hole to which a ground wire is connected;
A support base having a screw mounting hole formed of a synthetic resin and facing the screw insertion hole of the ground terminal, and having a convex portion formed so as to form a space around the screw mounting hole;
A ground screw screwed into the screw insertion hole of the ground terminal and the screw mounting hole of the terminal block;
A terminal block main body for accommodating an electrical component having a grounding terminal and a charging unit disposed adjacent to the grounding terminal;
A terminal block comprising: An instrument body;
A terminal block according to claim 3, which is arranged on the instrument body;
The lighting fixture characterized by comprising.

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