The patent was disclosed a telescopic mechanism in a telescopic hitch buffer device for use in high speed electric multiple unit (EMU) trains. The telescopic mechanism comprises a compression rod (2) located inside a movable housing (1) of said hitch buffer device, one end of said compression rod (2) being connected to the movable housing (1), and a bearing connector (3) encasing the compression rod (2). A guiding barrel (4) is fixedly mounted outside the bearing connector (3). An extension/retraction driving mechanism (9) is provided between the guiding barrel (4) and the movable housing (1). A locking mechanism comprises protrusions (6) distributed at the other end of the compression rod (2), and grooves (7) in engagement with protrusions (6) on the inner wall of the bearing connector (3). One end of the compression rod (2) is connected to the movable housing (1) via a torsion spring (5), keeping the compression rod (2) and the bearing connector (3) in a locked state; an unlocking driving mechanism is provided on the outside of the movable housing (1), and is in an unlocked state when the protrusions (6) face the grooves (7), in which case, the movable housing (1) and the bearing connector (3) can slide relative to each other. Since the extension/retraction driving mechanism (9) is provided inside the movable housing (1), volume is reduced, good protection is provided for respective components, and the telescopic mechanism and the locking mechanism are relatively simple in structure, labor-saving, reliable in operation, and can bear relatively large loads.

A coupling assembly (100) in a first car (12) configured to move relative to a second car (18), the coupling assembly (100) includes an extender (88) and a connector (99). While the first and second cars (12, 18) are both in motion, the extender (88) is configured to extend away from the first car (12) for connecting with the second car (18). The connector (99) is coupled to the extender (88) and is configured to perform the following while the first and second cars (12, 18) are both in motion: (i) connect with a mating connector (98) of the second car (18) when connecting between the first and second cars (12, 18), and (ii) disconnect from the mating connector (98) when disconnecting the first car (12) from the second car (18).

A coupling assembly (100) in a first car (12) configured to move relative to a second car (18), the coupling assembly (100) includes an extender (88) and a connector (99). While the first and second cars (12, 18) are both in motion, the extender (88) is configured to extend away from the first car (12) for connecting with the second car (18). The connector (99) is coupled to the extender (88) and is configured to perform the following while the first and second cars (12, 18) are both in motion: (i) connect with a mating connector (98) of the second car (18) when connecting between the first and second cars (12, 18), and (ii) disconnect from the mating connector (98) when disconnecting the first car (12) from the second car (18).