The utility model relates to a rotatory telescopic ring end cap of accidentally dropping for fishing rod, including end cap knob, end cap elevator and the metal lantern ring, end cap knob one end in install the end cap elevator that reciprocates, the metal lantern ring cup joint on the one end outer lane of end cap knob installation end cap elevator, and install end cap plastics lid on the end capelevator, end cap plastics lids one end insert between the metal lantern ring and the end cap knob tip, the one end outer lane of end cap knob installation end cap elevator on arranged twice rotationtype draw -in groove, twice rotation type draw -in groove is central symmetrical arrangement, end cap elevator outer lane on arrange two with the cylinder of twice rotation type draw -in groove one -to -one, end cap elevator be close to end cap plastics lid no. 1 and serve and arrange and lose the bracelet device, end cap plastics cover and arrange and stretch out the hole with the ring device ofaccidentally dropping corresponds. The utility model has the characteristics of simple structure, appearance are pleasing to the eye, convenient operation etc.一種用於釣竿的旋轉伸縮式失手環底帽,包括一固定件、一旋轉件及一升降件,該固定件安裝於一握把末端,並具有一圍繞一軸線的環壁,以及至少一設置於該環壁且呈螺旋槽狀的第一導槽,該旋轉件可轉動地與該固定件互相套接,並具有一與該環壁呈內外套接的周壁、一連接於該周壁的端壁,以及至少一設置於該周壁且呈直槽狀的第二導槽,該端壁具有一穿孔,該升降件可沿該軸線移動地安裝於該固定件內部,並具有一主體、至少一連接於該主體的導銷,以及一連接於該主體的連接部,該導銷穿設於該第一、二導槽中,且該旋轉件相對於該固定件轉動時,該導銷受到該第二導槽掣動,可帶動該連接部相對於該穿孔產生伸縮。100‧‧‧失手環底帽10‧‧‧固定件L‧‧‧軸線11‧‧‧環壁111‧‧‧固定端部112‧‧‧外側端部114‧‧‧內環面115‧‧‧外環面21‧‧‧周壁211‧‧‧第一端部212‧‧‧第二端部213‧‧‧內壁面214‧‧‧外壁面215‧‧‧卡溝22‧‧‧端壁221‧‧‧穿孔116‧‧‧嵌環117‧‧‧擋環部118‧‧‧外螺紋12‧‧‧第一導槽121‧‧‧平段122‧‧‧螺旋段13‧‧‧內孔131‧‧‧第一內徑段20‧‧‧旋轉件23‧‧‧第二導槽24‧‧‧環槽30‧‧‧升降件31‧‧‧主體32‧‧‧導銷33‧‧‧連接部331‧‧‧貫孔40‧‧‧飾環60‧‧‧封蓋
