Improvements in collector heads or current collectors for trolley buses and the like

摘要

513,889. Current collectors for electric vehicles. LIVINGSTONE, R., and ANTI-ATTRITION METAL CO., Ltd. Dec. 31, 1937, No. 19905/39. Divided out of 508,686. [Class 104 (iii)] In a current collector for trolley buses &c. the shoe 11 is supported by a spherical bearing 22 allowing free movement at least in one vertical plane containing the conductor, and the longitudinal dimension of the shoe or insert 10 forming the sliding surface varies throughout its depth so as to cause the vertical midplane X-X of the sliding surface to move with respect to 'the vertical centre line Y-Y of the bearing so as to compensate for the change in the relative positions of the geometric centre A of the bearing and the plane of the sliding surface caused by wear. The centre A may be below, coincident with, or above the sliding surface. The trailing end of the sliding surface may be bevelled so that an increasing length of surface becomes effective as the surface wears. The leading end may be undercut, and a rotatable shackle 29 has fingers 30 to engage in slots in the casting 26 and carries a ring or stirrup 31 to prevent the shoe from turning through 180 degrees. Specifications 465,088 and 508,686 are referred to.