| 摘要 |
An extensible single arm current collector device for electrically driven vehicles, said collector means having pivotally connected scissor arms which are spring biased toward their extended upper or outer position. The device includes means whereby the mechanical advantage between the spring and the scissor arms is progressively changed as the device is collapsed from its upper, extended operative position to its lowermost, retracted but operative position, whereby the contact pressure between the collector device and a trolley wire remains at least generally constant over the range of operative height adjustment of the collector device. |
