Improvements relating to the bases of trolley poles or booms appertaining to overhead electric wire traction systems

摘要

391,515. Electric trolley poles. BRECKNELL, WILLIS, & CO., Ltd., 59, Victoria Street, and WHELAN, R., 88, Bishop Street, St. Paul's, both in Bristol. Nov. 13, 1931, No. 31504. [Class 104 (iii).] The base of a trolley pole is provided with radially adjustable links c, one on each side of the base lever b, and connected by pins c<2> to rods g of the spring loads d.