PROBLEM TO BE SOLVED: To provide the fitting part of a multiple needle base not requiring the mutual positional alignment of needle bases when the adjacent needle bases of a multiple needle are fitted, blindly enabling insertional mounting and capable of certainly prescribing revolutionary operation.SOLUTION: In the fitting parts of the adjacent outside and inside bases of the multiple needle, a large number of projections the same in shape are provided to the outer peripheral surface of one base while a large number of grooves the same in shape fitted to the projections are provided to the inner peripheral surface of the other base. The respective projections and grooves are formed as an uneven shape continuing circumferentially over one periphery and the projections are formed into a triangular pyramid shape so that the end parts of them become tapered in the connection direction with the other base while the grooves are formed as long grooves having length in a direction parallel to an axis and formed so as to have a V-shaped cross section.COPYRIGHT: (C)2012,JPO&INPIT【課題】多重針の隣接する針基を嵌合するさい、針基相互の位置合わせの必要がなく、盲目的に挿着可能で、回動動作を確実に規制できる多重針基の嵌合部を提供すること。【解決手段】多重針の隣接する外側の基、及び、内側の基の嵌合部において、一方は、基の外周面に多数の同一形状の突起を設け、他方は、基の内周面に前記突起に適合する多数の同一形状の溝を設け、該突起及び溝各々を円周方向一周囲に亘り連続する凹凸形状として形成して、前記突起は、他方の基との接続方向に向って端部がテーパー状となる三角錐形状に形成し、前記溝は、軸に平行する方向に長さを持つ、断面をV字形状とする長溝として形成して構成した。【選択図】 図1
