JP5010231B2

JP5010231B2 - Bushing and lighting equipment using the same

Info

Publication number: JP5010231B2
Application number: JP2006282934A
Authority: JP
Inventors: 芳朗後藤; 勇藤田; 徹也遠藤
Original assignee: Panasonic Corp; Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Corp; Panasonic Holdings Corp
Priority date: 2006-10-17
Filing date: 2006-10-17
Publication date: 2012-08-29
Anticipated expiration: 2026-10-17
Also published as: JP2008103119A

Description

本発明は、電線が挿通されるブッシングおよびそれを用いた照明器具に関するものである。 The present invention relates to a bushing through which an electric wire is inserted and a lighting fixture using the same.

従来から、照明器具等の電気器具において、筐体や回路基板などに貫設された電線挿通用の電線挿通孔に、電線を挿通する貫通孔が貫設された筒状のブッシングを装着したものが種々提供されている（たとえば特許文献１参照）。 Conventionally, in electrical appliances such as lighting fixtures, a cylindrical bushing with a through hole through which a wire is inserted is fitted into a wire insertion hole for inserting a wire through a housing or a circuit board. Are provided in various ways (for example, see Patent Document 1).

この種のブッシングは、たとえば、貫通孔内で電線を保持することにより、電線に作用した張力が電線の接続部位に伝わることを防止したり、電線挿通孔の開口周縁と電線との隙間を埋めることにより、電線挿通孔と電線との間を通して充電部に水が浸入することを防止したりするために設けられる。
特開２００２−３１８２０８号公報（第５頁） This type of bushing, for example, by holding the electric wire in the through hole, prevents the tension acting on the electric wire from being transmitted to the connecting portion of the electric wire, or fills the gap between the opening peripheral edge of the electric wire insertion hole and the electric wire. By this, it is provided in order to prevent water from entering the charging unit through between the electric wire insertion hole and the electric wire.
JP 2002-318208 A (page 5)

ところで、上述したブッシングを用いると、通常、ブッシングに挿通された電線の先端部はブッシングから貫通孔の貫通方向に沿って突出する。そのため、貫通孔の貫通方向に直交する面内でブッシングから電線を引き出すには、電線を曲げて保持する必要がある。 By the way, when the above-described bushing is used, the tip portion of the electric wire inserted through the bushing usually protrudes from the bushing along the penetration direction of the through hole. Therefore, in order to pull out the electric wire from the bushing in a plane orthogonal to the penetration direction of the through hole, it is necessary to bend and hold the electric wire.

たとえば電線挿通孔の側方に電線の先端部を接続する接続パッドが設けられている場合には、作業者は、電線を先端部が接続パッド上に位置するように保持しながら接続作業（たとえばはんだ付け）を行う必要がある。しかし、作業者が電線を定位置に保持し続けることは困難であり、接続作業時に電線の先端部が動いてしまう可能性があるので、電線接続時の作業性はよくない。 For example, when a connection pad for connecting the tip of the electric wire is provided on the side of the wire insertion hole, the operator can perform a connection operation (for example, while holding the electric wire so that the tip is positioned on the connection pad) Soldering) is required. However, it is difficult for an operator to keep the electric wire in place, and the tip of the electric wire may move during connection work, so workability at the time of electric wire connection is not good.

本発明は上記事由に鑑みて為されたものであって、貫通孔の貫通方向に直交する面内で電線を引き出すことができるブッシングおよびそれを用いた照明器具を提供することを目的とする。 This invention is made | formed in view of the said reason, Comprising: It aims at providing the bushing which can draw out an electric wire within the surface orthogonal to the penetration direction of a through-hole, and a lighting fixture using the same.

請求項１の発明では、電線が挿通される電線挿通孔に装着され、前記電線を挿通する貫通孔が形成された筒状のブッシングであって、電線挿通孔の少なくとも一方の開口から電線挿通孔の外側に一部を突出させる形で電線挿通孔に嵌着され、電線挿通孔から突出した部位における前記貫通孔の開口の周囲に、前記電線が嵌め込まれることにより電線を保持する電線保持溝が、電線挿通孔から突出した部位の外周縁と貫通孔とを連結する形に設けられていることを特徴とする。 The invention according to claim 1 is a cylindrical bushing that is attached to an electric wire insertion hole through which an electric wire is inserted, and has a through hole through which the electric wire is inserted, and the electric wire insertion hole extends from at least one opening of the electric wire insertion hole. A wire holding groove for holding the electric wire by being fitted around the opening of the through hole in a portion protruding from the electric wire insertion hole. The outer peripheral edge of the portion protruding from the wire insertion hole and the through hole are connected to each other.

請求項２の発明は、光源を有した器具本体と、器具本体の一部を貫通する電線とを備え、器具本体が、前記電線が貫通する部位に、請求項１記載のブッシングが装着される電線挿通孔を有することを特徴とする。 The invention of claim 2 comprises an instrument main body having a light source and an electric wire penetrating a part of the instrument main body, and the bushing according to claim 1 is attached to a portion of the instrument main body through which the electric wire penetrates. It has a wire insertion hole.

本発明は、ブッシングのうちの電線挿通孔から突出した部位における貫通孔の開口の周囲に、電線が嵌め込まれることにより電線を保持する電線保持溝が、電線挿通孔から突出した部位の外周縁と貫通孔とを連結する形で設けられているので、貫通孔から引き出された電線を電線保持溝に嵌入して保持させることにより、貫通孔の貫通方向に直交する面内で電線を引き出すことができる。その結果、電線は電線保持溝に保持されることによって先端部が位置決めされることとなるので、たとえば電線挿通孔の側方に電線の先端部を接続する場合でも、電線の先端部が動くことを防止でき、電線接続時の作業性が向上するという利点がある。 The present invention provides a wire holding groove for holding an electric wire by fitting an electric wire around an opening of a through hole in a portion protruding from the electric wire insertion hole of the bushing, and an outer peripheral edge of the portion protruding from the electric wire insertion hole Since it is provided in the form of connecting with the through hole, the electric wire drawn out from the through hole can be pulled into the electric wire holding groove and held, so that the electric wire can be pulled out in a plane perpendicular to the through direction of the through hole. it can. As a result, the tip of the wire is positioned by being held in the wire holding groove, so that the tip of the wire moves even when the tip of the wire is connected to the side of the wire insertion hole, for example. There is an advantage that workability at the time of wire connection is improved.

（実施形態１）
本実施形態ではブッシングとして、天井に一部が埋め込まれる形で設置されることによりダウンライトとして機能する照明器具に用いられるブッシングを例示する。この照明器具Ａの器具本体２１は、図２に示すように、設置状態での下面に円形状の開口窓２２を有した箱状であって開口窓２２の周縁から外方へ外鍔２３が延設されたケース２４を有し、天井を構成する天井材（図示せず）に形成された施工孔（図示せず）に、前記ケース２４が挿入されることにより外鍔２３を前記施工孔の周囲の下面に当接させる形で天井材に取り付けられる。なお、ケース２４の外側には、器具本体２１を天井材に取り付けるための板ばねからなる一対の取付ばね２５を一体に設けたコ字状の取付部材２６が取り付けられている。 (Embodiment 1)
In this embodiment, the bushing used for the lighting fixture which functions as a downlight by being installed in the form where a part is embedded in the ceiling is illustrated as a bushing. As shown in FIG. 2, the fixture body 21 of the lighting fixture A has a box shape having a circular opening window 22 on the lower surface in the installed state, and an outer casing 23 is provided outward from the periphery of the opening window 22. The case 24 is inserted into a construction hole (not shown) formed in a ceiling material (not shown) that has an extended case 24 and constitutes the ceiling. It is attached to the ceiling material in the form of contacting with the lower surface of the periphery. A U-shaped attachment member 26 integrally provided with a pair of attachment springs 25 made of leaf springs for attaching the appliance main body 21 to the ceiling material is attached to the outside of the case 24.

上述の照明器具Ａは、図３に示すように板状の取付ベース２とカバー６とで構成されるハウジング２７内に光源としてのＬＥＤ３を収納してなる光源ユニット２８をケース２４内に備え、ケース２４と光源ユニット２８で器具本体２１を構成する。この照明器具Ａでは、それぞれ絶縁された一対の電線Ｌ１，Ｌ２を一括して保護用の外被４ａで覆ったケーブル４を電源線として光源ユニット２８に電力供給を行う。 The above-mentioned lighting fixture A includes a light source unit 28 in which a LED 3 as a light source is housed in a housing 27 formed of a plate-like mounting base 2 and a cover 6 as shown in FIG. The case main body 21 is composed of the case 24 and the light source unit 28. In this luminaire A, power is supplied to the light source unit 28 using a cable 4 in which a pair of insulated wires L1 and L2 are covered with a protective covering 4a as a power source.

取付ベース２の前面（器具本体２１を設置した状態での下面）には回路基板１２が取着されており、ＬＥＤ３は回路基板１２の前面に複数個実装される。ここで、取付ベース２と回路基板１２との両方に連通する形で取付ベース２の厚み方向に貫通する電線挿通孔５が形成されており、電力供給用のケーブル４は、電線挿通孔５に挿通されることにより取付ベース２の背面（器具本体２１を設置した状態での上面）側から回路基板１２の前面側に引き込まれる。なお、ケース２４の底壁の中央部には電線Ｌ１，Ｌ２を通す透孔（図示せず）が貫設され、電線Ｌ１，Ｌ２において光源ユニット２８に引き込まれた一端部とは反対側の他端部には、器具本体２１とは別に設置された電源ユニット（図示せず）が接続される。 A circuit board 12 is attached to the front surface of the mounting base 2 (the lower surface with the instrument main body 21 installed), and a plurality of LEDs 3 are mounted on the front surface of the circuit board 12. Here, an electric wire insertion hole 5 penetrating in the thickness direction of the attachment base 2 is formed so as to communicate with both the attachment base 2 and the circuit board 12, and the power supply cable 4 is connected to the electric wire insertion hole 5. By being inserted, the mounting base 2 is drawn from the back side (upper surface in a state where the instrument main body 21 is installed) side to the front side of the circuit board 12. In addition, a through hole (not shown) through which the electric wires L1 and L2 pass is penetrated in the central portion of the bottom wall of the case 24, and the other side opposite to the one end portion drawn into the light source unit 28 in the electric wires L1 and L2. A power supply unit (not shown) installed separately from the instrument body 21 is connected to the end.

光源ユニット２８においては、図４（ａ）に示すように回路基板１２の前面に一対の接続パッド１３，１４が設けられており、各接続パッド１３，１４には各電線Ｌ１，Ｌ２の先端部がそれぞれはんだ付けにより接続される。図４の例では、取付ベース２として、前面が円形状であって中心部に電線挿通孔５が形成されたものを用いており、両接続パッド１３，１４は電線挿通孔５の両側方に配設されている。 In the light source unit 28, as shown in FIG. 4A, a pair of connection pads 13, 14 are provided on the front surface of the circuit board 12, and each connection pad 13, 14 has a tip portion of each of the electric wires L1, L2. Are connected by soldering. In the example of FIG. 4, the mounting base 2 has a circular front surface and a wire insertion hole 5 formed in the center, and both connection pads 13 and 14 are provided on both sides of the wire insertion hole 5. It is arranged.

カバー６は、回路基板１２へのＬＥＤ３等の部品の実装および電線パッド１３，１４への電線Ｌ１，Ｌ２の接続が完了した後で取付ベース２に取り付けられる。図３の例では、カバー６の周部から突出したかしめ突起１６を取付ベース２の周部に形成された取付孔１７に差し込み、その後かしめ突起１６の先端部をかしめることによりカバー６と取付ベース２とを結合しているが、カバー６と取付ベース２との結合手段はこの構成に限らない。なお、カバー６において各ＬＥＤ３に対応する位置にはそれぞれＬＥＤ３からの光の配光を制御するレンズ１８が形成されている。カバー６におけるレンズ１８以外の部位は絶縁性を有するとともに、ＬＥＤ３からの光を反射する反射板として機能する。 The cover 6 is attached to the mounting base 2 after the mounting of the components such as the LED 3 on the circuit board 12 and the connection of the electric wires L1, L2 to the electric wire pads 13, 14 are completed. In the example of FIG. 3, the caulking protrusion 16 protruding from the peripheral portion of the cover 6 is inserted into the mounting hole 17 formed in the peripheral portion of the mounting base 2, and then the tip end portion of the caulking protrusion 16 is caulked to be attached to the cover 6. Although the base 2 is coupled, the coupling means between the cover 6 and the mounting base 2 is not limited to this configuration. In the cover 6, lenses 18 for controlling the light distribution from the LEDs 3 are formed at positions corresponding to the respective LEDs 3. The portions other than the lens 18 in the cover 6 have insulating properties and function as a reflecting plate that reflects light from the LED 3.

本実施形態のブッシング１は、上述した光源ユニット２８の電線挿通孔５に装着されるものである。以下では、ブッシング１の構成について説明する。 The bushing 1 of this embodiment is attached to the electric wire insertion hole 5 of the light source unit 28 described above. Below, the structure of the bushing 1 is demonstrated.

ブッシング１は、図１および図５に示すように、断面円形状の貫通孔７が貫通した筒状に形成されており、貫通孔７の貫通方向の一端部に貫通孔７の貫通方向に直交する面内で貫通孔７の両側方に突出する一対の鍔片８を有する。一対の鍔片８は、貫通孔７を中心として２回回転対称となる位置に設けられている。両鍔片８の先端面は、貫通孔７の内周面に沿って湾曲している。なお、本実施形態のブッシング１はゴム弾性を有する合成樹脂材料から形成される。 As shown in FIGS. 1 and 5, the bushing 1 is formed in a cylindrical shape with a through hole 7 having a circular cross section, and is orthogonal to the through direction of the through hole 7 at one end of the through hole 7 in the through direction. A pair of flanges 8 projecting on both sides of the through-hole 7 in the plane to be performed. The pair of flanges 8 are provided at positions that are twice rotationally symmetric about the through hole 7. The front end surfaces of both flange pieces 8 are curved along the inner peripheral surface of the through hole 7. In addition, the bushing 1 of this embodiment is formed from the synthetic resin material which has rubber elasticity.

ブッシング１は、鍔片８よりも貫通孔７の貫通方向の他端部（鍔片８側とは反対側の端部）側に、外周形状が貫通孔７に沿って断面円形状に形成された円筒部９を有する。ここにおいて、ブッシング１は、円筒部９が上述した電線挿通孔５に嵌入されることにより、円筒部９以外の部分（以下、鍔部１０という）を電線挿通孔５の開口から突出させる形で電線挿通孔５に装着される。ここに、回路基板１２の前面から鍔片８の厚み寸法（貫通孔７の貫通方向の寸法）分だけブッシング１を突出させることにより、両接続パッド１３，１４間の沿面距離を伸ばし、両接続パッド１３，１４間の絶縁性を確保することができる。 The bushing 1 has an outer peripheral shape formed in a circular cross-section along the through-hole 7 on the other end portion in the penetrating direction of the through-hole 7 (the end opposite to the side of the rod-piece 8). A cylindrical portion 9. Here, the bushing 1 is configured such that a portion other than the cylindrical portion 9 (hereinafter referred to as the flange portion 10) projects from the opening of the electric wire insertion hole 5 when the cylindrical portion 9 is fitted into the electric wire insertion hole 5 described above. It is attached to the wire insertion hole 5. Here, the bushing 1 is protruded from the front surface of the circuit board 12 by the thickness dimension of the flange 8 (dimension in the penetration direction of the through-hole 7), thereby extending the creeping distance between the connection pads 13 and 14 and connecting both connections. Insulation between the pads 13 and 14 can be ensured.

円筒部９は、鍔部１０から離れるほど外径が小さくなる先細り形状に形成され、電線挿通孔５への嵌入が容易になっている。ここで、円筒部９は、鍔部１０側の端部の外径が電線挿通孔５よりもやや大きくなるように形成されている。これにより、円筒部９を電線挿通孔５に嵌入すると、円筒部９における鍔部１０側の端部が電線挿通孔５内で圧縮され、貫通孔７が縮径されることとなる。 The cylindrical portion 9 is formed in a tapered shape whose outer diameter decreases as the distance from the flange portion 10 increases, and the cylindrical portion 9 is easily fitted into the wire insertion hole 5. Here, the cylindrical portion 9 is formed so that the outer diameter of the end portion on the flange portion 10 side is slightly larger than the wire insertion hole 5. Thus, when the cylindrical portion 9 is fitted into the electric wire insertion hole 5, the end portion on the flange portion 10 side of the cylindrical portion 9 is compressed in the electric wire insertion hole 5, and the through hole 7 is reduced in diameter.

ブッシング１の貫通孔７には、電線挿通孔５を通すケーブル４が挿通される。ここに、ブッシング１は、電線挿通孔５に取り付けられる前の状態で、貫通孔７がケーブル４の外被４ａの外径と略同径となるように形成されている。したがって、円筒部９を電線挿通孔５に嵌入して貫通孔７が縮径されると、貫通孔７に挿通されたケーブル４は貫通孔７内でブッシング１により挟持され長手方向への移動が禁止される。その結果、ブッシング１は所謂張力止めとして機能し、光源ユニット２８の外側で電線Ｌ１，Ｌ２が引張られて電線Ｌ１，Ｌ２に張力が作用しても、当該張力はブッシング１で遮断され、接続パッド１３，１４に接続された電線Ｌ１，Ｌ２の先端部に伝わることはない。 A cable 4 that passes through the electric wire insertion hole 5 is inserted into the through hole 7 of the bushing 1. Here, the bushing 1 is formed so that the through hole 7 has substantially the same diameter as the outer diameter of the jacket 4 a of the cable 4 before being attached to the electric wire insertion hole 5. Therefore, when the cylindrical portion 9 is fitted into the electric wire insertion hole 5 and the through hole 7 is reduced in diameter, the cable 4 inserted into the through hole 7 is sandwiched by the bushing 1 in the through hole 7 and moved in the longitudinal direction. It is forbidden. As a result, the bushing 1 functions as a so-called tension stopper, and even if the electric wires L1 and L2 are pulled outside the light source unit 28 and tension is applied to the electric wires L1 and L2, the tension is interrupted by the bushing 1, and the connection pad There is no transmission to the tips of the wires L1, L2 connected to the wires 13, 14.

また、ブッシング１は、貫通孔７の貫通方向に直交する面内で鍔片８の突出方向とは直交する方向に貫通孔７を開放するスリット１１が、貫通孔７の貫通方向の全長に亘って形成されている。このスリット１１を設けたことにより貫通孔７の径が変化しやすくなるので、貫通孔７にケーブル４を挿通しやすくなる。 Further, the bushing 1 has a slit 11 that opens the through hole 7 in a direction orthogonal to the protruding direction of the collar piece 8 in a plane orthogonal to the through direction of the through hole 7 over the entire length of the through hole 7 in the through direction. Is formed. By providing this slit 11, the diameter of the through hole 7 is likely to change, so that the cable 4 can be easily inserted into the through hole 7.

ところで、各電線Ｌ１，Ｌ２の先端部をそれぞれ接続パッド１３，１４に接続する際に、各電線Ｌ１，Ｌ２の先端部が動いてしまうと作業性がよくない。そこで、本実施形態のブッシング１は、図１および図５に示すように、電線挿通孔５への装着時に電線挿通孔５の開口から突出する鍔部１０のうち、貫通孔７の貫通方向において円筒部９側とは反対側の一端面に、各電線Ｌ１，Ｌ２がそれぞれ嵌め込まれる電線保持溝１５を有している。電線保持溝１５に嵌め込まれる電線Ｌ１，Ｌ２は、ケーブル４の外被４ａが剥離された状態の各電線Ｌ１，Ｌ２である。 By the way, when the tip ends of the electric wires L1 and L2 are connected to the connection pads 13 and 14, respectively, if the tip portions of the electric wires L1 and L2 move, workability is not good. Therefore, as shown in FIGS. 1 and 5, the bushing 1 according to the present embodiment has a through-hole 7 in the through-hole 7 of the flange portion 10 that protrudes from the opening of the wire insertion hole 5 when being attached to the wire insertion hole 5. On one end surface opposite to the cylindrical portion 9 side, there is an electric wire holding groove 15 into which the electric wires L1 and L2 are fitted. The electric wires L1 and L2 fitted in the electric wire holding groove 15 are the electric wires L1 and L2 in a state where the outer cover 4a of the cable 4 is peeled off.

電線保持溝１５は、幅寸法が各電線Ｌ１，Ｌ２の直径と略同一に設定されており、電線Ｌ１，Ｌ２が嵌め込まれるだけで電線Ｌ１，Ｌ２を保持することができる。この電線保持溝１５は、貫通孔７に連続し、且つ貫通孔７の貫通方向に直交する面内で貫通孔７の中心部を通り鍔片８の突出方向に沿う一直線上に延長されている。ここで、ブッシング１は、各鍔片８の先端部をそれぞれ接続パッド１３，１４に向けて電線挿通孔５に装着される。つまり、電線保持溝１５は貫通孔７から各接続パッド１３，１４に向けて延長されることとなる。 The electric wire holding groove 15 is set to have a width dimension substantially the same as the diameter of each electric wire L1, L2, and can hold the electric wires L1, L2 only by fitting the electric wires L1, L2. The electric wire holding groove 15 is continuous with the through hole 7 and extends on a straight line that passes through the center of the through hole 7 and extends along the protruding direction of the flange 8 within a plane orthogonal to the through direction of the through hole 7. . Here, the bushing 1 is attached to the electric wire insertion hole 5 with the tip portions of the flanges 8 facing the connection pads 13 and 14, respectively. That is, the electric wire holding groove 15 is extended from the through hole 7 toward the connection pads 13 and 14.

上述した構成によれば、図４に示すように、貫通孔７から電線Ｌ１，Ｌ２を引き出す長さを電線挿通孔５と各接続パッド１３，１４との間の距離に応じて調節した上で、電線保持溝１５に各電線Ｌ１，Ｌ２を嵌入して保持させることによって、各電線Ｌ１，Ｌ２の先端部を各接続パッド１３，１４上にそれぞれ位置決めすることができる。したがって、各電線Ｌ１，Ｌ２の先端部を接続パッド１３，１４にそれぞれ接続するはんだ付け作業が容易になり、作業性が向上するという利点がある。 According to the configuration described above, as shown in FIG. 4, after adjusting the length of pulling out the wires L <b> 1 and L <b> 2 from the through hole 7 according to the distance between the wire insertion hole 5 and each of the connection pads 13 and 14. By inserting and holding the electric wires L1 and L2 in the electric wire holding groove 15, the tip portions of the electric wires L1 and L2 can be positioned on the connection pads 13 and 14, respectively. Therefore, there is an advantage that the soldering work for connecting the tip ends of the electric wires L1 and L2 to the connection pads 13 and 14 is facilitated, and the workability is improved.

本実施形態では、電線挿通孔５の両側方に設けられた接続パッド１３，１４に電線Ｌ１，Ｌ２を接続するために、上述のように貫通孔７から両側方に延長された形状の電線保持溝１５を採用しているが、電線保持溝１５はこの形状に限定されるものではなく、貫通孔７からの電線保持溝１５の延長方向は、貫通孔７の貫通方向に直交する面内で貫通孔７から電線Ｌ１，Ｌ２を引き出す向きに応じて適宜設定することが望ましい。すなわち、電線保持溝１５は、貫通孔７の貫通方向に直交する面内で鍔部１０の外周縁と貫通孔７とを連結する形に延長されていればよく、たとえば一部湾曲した形状であってもよい。 In this embodiment, in order to connect the electric wires L1 and L2 to the connection pads 13 and 14 provided on both sides of the electric wire insertion hole 5, the electric wire holding shape extended from the through hole 7 to both sides as described above. Although the groove 15 is employed, the wire holding groove 15 is not limited to this shape, and the extending direction of the wire holding groove 15 from the through hole 7 is within a plane orthogonal to the through direction of the through hole 7. It is desirable to set as appropriate according to the direction in which the electric wires L1 and L2 are drawn from the through hole 7. That is, the electric wire holding groove 15 only needs to be extended so as to connect the outer peripheral edge of the flange portion 10 and the through hole 7 within a plane orthogonal to the through direction of the through hole 7. There may be.

また、電線保持溝１５は、電線Ｌ１，Ｌ２を内部に収納することができるように深さ寸法が各電線Ｌ１，Ｌ２の直径よりも大きく設定されている。そのため、図４（ｂ）に示すように電線保持溝１５内に電線Ｌ１，Ｌ２を嵌め込むことにより、ブッシング１の鍔部１０の厚み寸法内で電線Ｌ１，Ｌ２を引き回すことができ、回路基板１２の前面からの電線Ｌ１，Ｌ２の高さ寸法を小さく抑えることができる。 Further, the electric wire holding groove 15 is set to have a depth dimension larger than the diameter of each of the electric wires L1 and L2 so that the electric wires L1 and L2 can be accommodated therein. Therefore, as shown in FIG. 4B, by inserting the electric wires L1 and L2 into the electric wire holding groove 15, the electric wires L1 and L2 can be routed within the thickness dimension of the flange portion 10 of the bushing 1. The height dimension of the electric wires L1, L2 from the front surface of 12 can be kept small.

さらに、カバー６におけるブッシング１との対向部位には先端面をブッシング１に押し当てる突台１９が突設されている。したがって、カバー６を取付ベース２に取り付けた状態では、突台１９によってブッシング１が押圧されて円筒部９が電線挿通孔５内に押し込まれることとなる。その結果、ブッシング１は、貫通孔７が縮径されて電線Ｌ１，Ｌ２（ケーブル４）をより強固に保持し、張力止めとしての機能が向上する。 Further, a projecting table 19 is provided at the portion of the cover 6 facing the bushing 1 so as to press the tip end surface against the bushing 1. Therefore, in a state where the cover 6 is attached to the attachment base 2, the bushing 1 is pressed by the protrusion 19 and the cylindrical portion 9 is pushed into the electric wire insertion hole 5. As a result, the bushing 1 has a reduced diameter of the through hole 7 to hold the electric wires L1 and L2 (cable 4) more firmly, and the function as a tension stopper is improved.

なお、本実施形態では、貫通孔７に電線Ｌ１，Ｌ２を挿通しやすくするためにスリット１１が形成されたブッシング１を例示したが、本発明を実施するためにスリット１１は必須の構成ではなく、スリット１１を省略してもよい。 In the present embodiment, the bushing 1 in which the slit 11 is formed to facilitate the insertion of the electric wires L1 and L2 into the through hole 7 is illustrated, but the slit 11 is not an essential configuration for carrying out the present invention. The slit 11 may be omitted.

また、電線保持溝１５の深さ寸法は、各電線Ｌ１，Ｌ２の直径よりも大きい寸法に限定されるものではなく、各電線Ｌ１，Ｌ２を嵌め込むことにより電線Ｌ１，Ｌ２を保持できる範囲であれば、各電線Ｌ１，Ｌ２の直径と同等の寸法や各電線Ｌ１，Ｌ２の直径よりも小さい寸法であってもよい。 Moreover, the depth dimension of the electric wire holding groove 15 is not limited to a dimension larger than the diameter of each electric wire L1, L2, but is within a range in which the electric wires L1, L2 can be held by fitting the electric wires L1, L2. If it exists, the dimension equivalent to the diameter of each electric wire L1, L2 and the dimension smaller than the diameter of each electric wire L1, L2 may be sufficient.

（実施形態２）
本実施形態では、図６に示すように、回路基板１２に、ブッシング１の鍔部１０における回路基板１２に沿った断面形状に合わせて形成された嵌合孔２０が貫設された光源ユニット２８に用いられるブッシング１を例示する。本実施形態のブッシング１は、鍔部１０を嵌合孔２０に嵌合させるように装着される点が実施形態１とは相違する。 (Embodiment 2)
In the present embodiment, as shown in FIG. 6, a light source unit 28 in which a fitting hole 20 formed in accordance with a cross-sectional shape along the circuit board 12 in the flange portion 10 of the bushing 1 penetrates the circuit board 12. The bushing 1 used for is illustrated. The bushing 1 of the present embodiment is different from the first embodiment in that the bushing 1 is mounted so as to fit the flange portion 10 into the fitting hole 20.

すなわち、本実施形態では、図６（ｂ）のように嵌合孔２０内に鍔部１０の少なくとも一部が挿入されることとなり、回路基板１２の前面から鍔部１０の全体が突出する場合に比べて、回路基板１２の前面からのブッシング１の突出量が小さくなる。したがって、回路基板１２の厚み方向における光源ユニット２８の寸法を小さく抑え、光源ユニット２８の薄型化を図ることができるという利点がある。ここで、鍔部１０のうち少なくとも電線保持溝１５が設けられた部分については回路基板１２の前面から突出するように、鍔片８の厚み寸法および嵌合孔２０の深さ寸法が設定されている。この場合に、電線Ｌ１，Ｌ２を電線保持溝１５の全長に亘って嵌め込むことができるので、電線Ｌ１，Ｌ２の位置固定を確実に行うことができる。 That is, in this embodiment, as shown in FIG. 6B, at least a part of the flange portion 10 is inserted into the fitting hole 20, and the entire flange portion 10 protrudes from the front surface of the circuit board 12. Compared to the above, the protruding amount of the bushing 1 from the front surface of the circuit board 12 is reduced. Therefore, there is an advantage that the size of the light source unit 28 in the thickness direction of the circuit board 12 can be suppressed to be small and the light source unit 28 can be thinned. Here, the thickness dimension of the flange piece 8 and the depth dimension of the fitting hole 20 are set so that at least the portion of the flange portion 10 where the wire holding groove 15 is provided protrudes from the front surface of the circuit board 12. Yes. In this case, since the electric wires L1 and L2 can be fitted over the entire length of the electric wire holding groove 15, the positions of the electric wires L1 and L2 can be reliably fixed.

また、鍔部１０においては貫通孔７の両側方に一対の鍔片８が突出しているので、鍔部１０が嵌合孔２０に嵌合した状態では、回路基板１２の前面に沿う面内でのブッシング１の回転は禁止される。これにより、回路基板１２の前面に沿う面内でのブッシング１の向きは嵌合孔２０の開口形状に応じて決まり、結果的に、ブッシング１から電線Ｌ１，Ｌ２を引き出す向きを確実に固定できるという効果を奏する。 Further, since the pair of flange pieces 8 protrudes on both sides of the through hole 7 in the flange portion 10, the flange portion 10 is fitted in the engagement hole 20 in a plane along the front surface of the circuit board 12. The rotation of the bushing 1 is prohibited. Thereby, the direction of the bushing 1 in the plane along the front surface of the circuit board 12 is determined according to the opening shape of the fitting hole 20, and as a result, the direction in which the electric wires L1 and L2 are drawn from the bushing 1 can be reliably fixed. There is an effect.

なお、本実施形態では取付ベース２として、図６（ａ）に示すように前面が矩形状であって中心部に電線挿通孔５が形成されたものを例示しているが、取付ベース２の形状はこの形状に限定されるものではない。その他の構成および機能は実施形態１と同様である。 In the present embodiment, as the mounting base 2, as shown in FIG. 6 (a), the front surface is rectangular and the wire insertion hole 5 is formed at the center. The shape is not limited to this shape. Other configurations and functions are the same as those of the first embodiment.

本発明の実施形態１のブッシングを示し、（ａ）は正面図、（ｂ）は側面図、（ｃ）は他方向からみた側面図である。The bushing of Embodiment 1 of this invention is shown, (a) is a front view, (b) is a side view, (c) is a side view seen from the other direction. 同上のブッシングを用いた照明器具を示す斜視図である。It is a perspective view which shows the lighting fixture using a bushing same as the above. 同上のブッシングを用いた照明器具の要部を示す一部を破断した側面図である。It is the side view which fractured | ruptured a part which shows the principal part of the lighting fixture using a bushing same as the above. 同上のブッシングを用いた照明器具の要部を示し、（ａ）は正面図、（ｂ）は断面図である。The principal part of the lighting fixture using a bushing same as the above is shown, (a) is a front view, (b) is a sectional view. 同上のブッシングを示す斜視図である。It is a perspective view which shows a bushing same as the above. 本発明の実施形態２のブッシングを用いた照明器具の要部を示し、（ａ）は正面図、（ｂ）は断面図である。The principal part of the lighting fixture using the bushing of Embodiment 2 of this invention is shown, (a) is a front view, (b) is sectional drawing.

Explanation of symbols

１ブッシング
２取付ベース
３ＬＥＤ（光源）
５電線挿通孔
７貫通孔
１５電線保持溝
２１器具本体
Ａ照明器具
Ｌ１，Ｌ２電線 1 Bushing 2 Mounting base 3 LED (Light source)
5 Electric wire insertion hole 7 Through hole 15 Electric wire holding groove 21 Instrument body A Lighting equipment L1, L2 Electric wire

Claims

A cylindrical bushing that is attached to an electric wire insertion hole through which an electric wire is inserted and has a through hole through which the electric wire is inserted, and a part of the bushing protrudes from the opening of the electric wire insertion hole to the outside of the electric wire insertion hole An electric wire holding groove for holding the electric wire is protruded from the electric wire insertion hole by fitting the electric wire around the opening of the through hole in a portion protruding from the electric wire insertion hole. A bushing characterized in that the bushing is provided so as to connect an outer peripheral edge of a part and a through hole.

An instrument main body having a light source and an electric wire penetrating a part of the instrument main body, and the instrument main body has an electric wire insertion hole in which the bushing according to claim 1 is mounted at a portion through which the electric wire penetrates. Lighting equipment using the characteristic bushing.