US 12,459,367 B2
Drive system for a pantograph, and method for raising or lowering
Alexander Gruber, Goeming (AT)
Assigned to SCHUNK TRANSIT SYSTEMS GMBH, Nussdorf am Haunsberg (AT)
Appl. No. 17/634,408
Filed by SCHUNK TRANSIT SYSTEMS GMBH, Nussdorf am Haunsberg (AT)
PCT Filed Aug. 12, 2019, PCT No. PCT/EP2019/071626
§ 371(c)(1), (2) Date Sep. 7, 2022,
PCT Pub. No. WO2021/028019, PCT Pub. Date Feb. 18, 2021.
Prior Publication US 2023/0010860 A1, Jan. 12, 2023
Int. Cl. B60L 5/32 (2006.01); B60L 5/20 (2006.01); F16K 17/02 (2006.01); F16K 31/126 (2006.01)
CPC B60L 5/32 (2013.01) [B60L 5/205 (2013.01); F16K 17/02 (2013.01); F16K 31/126 (2013.01); B60L 2200/26 (2013.01); B60Y 2200/30 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A drive system for raising or lowering at least one sliding piece of a current collector for rail vehicles, the sliding piece being disposed on a positioning device of the current collector, said positioning device being adjustable by the drive system, and the sliding piece being configured to be brought into contact with an overhead line using a contact pressure, the drive system comprising a bellows drive which is configured to be actuated by means of compressed air for actuating the positioning device, the drive system comprising a pneumatic control unit having a control valve for supplying or withdrawing compressed air to/from the bellows drive, and the drive system comprising a lowering unit having a pneumatic detection line and a lowering valve for venting the bellows drive when pressure drops in the detection line,
wherein
the lowering valve is a 3/2-way valve, the lowering valve being disposed in a pneumatic supply line between the control valve and the bellows drive, and wherein the detection line is connected to a second pneumatic supply line of the control unit for forming the operating pressure in the detection line, a throttle valve of the lowering unit being disposed in the second supply line.