Bicycle rack's beta structure

The utility model relates to a bicycle beta structure contains two riser (1), and every riser respectively has 1 top (1a) to set up can use closed position and folding connecting plate (2) of removingof opening between the position, in addition the structure still contains connecting plate (2) reversible coupled system of a closed position, contains: breech lock (12) of connecting plate (2) removal relatively between operating position and non - operating position, pass through to non -client location elastic stress device (15), operating position's mobile device contains cam (17) lever (16)and a cam support of being connected with breech lock (12), is carved with on the cam supports recess (18), and the tight state of clamp that state and operating position are relaxed to cam (17) basisis mutually by the installation, the support contains a summary thin recess (24), cam (17) of release position can be on recess (24) the countermovement, the elastic stress of realization non -clientlocation breech lock (12).