| 摘要 |
PROBLEM TO BE SOLVED: To provide a pull-off device for a trolley wire capable of considerably reducing inertial mass, while having strength equivalent to conventional strength. SOLUTION: This pull-off device 1 has an arm 2 integrally formed by aluminum or an aluminum alloy. The arm 2 has structure including conventional pull fitting and ear mounting fitting. The arm 2 is provided with a connecting part 4 on a base end side connected to a supporting structure, an ear holding part 5 on a distal end side for holding an ear 3 and an arm body part 6 curved and extended between both of the parts 4 and 5. The arm body part 6 is provided with a pair of upper and lower flanges 7 and a web 8 connecting the flange parts 7. A width dimension of the flange 7 and a height dimension of the web 8 are gradually reduced from a portion P in a prescribed range in the vicinity of a length direction intermediate part receiving maximum stress in the arm body part 6 toward the distal end side. The width dimension and the height dimension can be gradually reduced from the portion P toward the base end side or can be made constant up to the base end. COPYRIGHT: (C)2009,JPO&INPIT
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