STREET CAR WITH LOWERED LEVEL OF FLOOR Russian patent published in 2007 - IPC B61D13/00 

FIELD: transport engineering.

SUBSTANCE: invention relates to rail vehicles of street car-type with lowered level of floor and it can be used in manufacture of current collectors used in rail vehicles. Proposed car with lowered level of floor has body, running gear, power circuit including current collector, power system connected with current collector and including switching and protective devices, traction electric drive, local demands supply converter and storage battery. Current collector contains contact unit with current collecting plates movable secured in vertical plane in succession of base provided with drive, upper and lower frames connected to form semipantograph lifting-lowering mechanism of current collector installed on car roof. Upper frame includes at least one elements, length l₁, in axles of its joints, on upper end of which suspension unit of carriage with current collecting element or assembly of at least two current collecting elements is mounted. Lower includes at least one element, length l₂, and lower tie-rod length l₃, satisfying condition l₃=l₁=l₂. Element, length l₁, is provided with joint on its lower end which can move over arc of circumference owing to connection with lower frame of mechanism and is provided with element, length l₄, with joint on its free end arranged at angel α to element, length l₁ and element, length l₁ rigidly connected with its lower end. Joint on free end of element, length l₄ is connected with lower frame, thus providing turning of element, length l₁ through angle β around joint on its lower end. Distance between joint on lower end of element, length l₁ and joint on free end of element, length l₄ and angle between them are chosen from condition of mainly linear vertical displacement of upper end of element, length l₁ with carriage suspension unit in design range of heights at maximum value of turning angle of element, length l₁, of upper frame relative to horizontal.

EFFECT: reduced material usage in car, cost of maintenance and consumption of energy, increased service life owing to design of current collector providing constant pressure of contact shoe to contact wire.

12 cl, 13 dwg