UNIT COUPLING STRUCTURE

To provide a unit coupling structure that provides electrically high connection reliability and that is capable of securely fitting units to one another.SOLUTION: A second unit 20 includes a main body 21 having an inner cylinder part 2111 in which a circumferential surface is formed and which has a connection surface 212 and a connection surface 1431, and a cylindrical case part 22 which rotatably encloses the circumferential surface of the main body 21. A female connector 24 is disposed on the connection surface 1431 in the connection surface 212, and a male connector 23 is disposed on the connection surface 212. At one end portion of the second unit 20, a first connection part 110 is formed in which the connection surface 1431 is retreated on the side deeper than a circumference of the case part 22, and a protrusion part 151 protruding toward the inside is formed in an edge part of an opening of the case part 22. At another end portion, a second connection part 120 is formed in which a recessed groove 213 to receive the protrusion part 151 is formed along in the circumferential direction on a circumferential surface of a projection of the main body 31 projected from the case part 32.SELECTED DRAWING: Figure 3 【課題】電気的に高い接続信頼性が得られ、ユニット同士をしっかりと嵌合させることができるユニット連結構造を提供する。【解決手段】第２ユニット２０は、円周面が形成された内筒部２１１１を有すると共に、連結面２１２と連結面１４３１を有する本体部２１と、本体部２１の円周面を回転自在に囲う円筒状のケース部２２とを備えている。連結面２１２には、連結面１４３１に雌型のコネクタ２４が配置され、連結面２１２に雄型のコネクタ２３が配置されている。第２ユニット２０の一方の端部には、連結面１４３１がケース部２２の周縁より奥側に引っ込んでおり、ケース部２２の開口縁部に内側に向かって突出する突起部１５１が形成された第１連結部１１０が形成され、他方の端部には、本体部３１がケース部３２より突出した突出部の円周面に、突起部１５１が差し込まれる凹溝２１３が円周方向に沿って形成された第２連結部１２０が形成された。【選択図】図３