The invention relates to a blocking device, which is composed of L () module, which is composed of vertical branch () 1b and horizontal branch () 1a.The connecting device is characterized in that the connecting device includes at least one geometric structure between the branches（ Between the L-shaped modules, at least one 6.7 axis includes a rigid portion (6a) and a suspicious portion (6b) extending between the end modules of the device to provide a rigid device having a wheel (8) that deviates from an operating axis.
展开▼
