Abstract: A motion synchronized multi-tier pallet rack and a battery formation apparatus are provided. The pallet rack includes a fixation rack, two movable frames, and two actuators. The movable frames are coupled to two corresponding sides of the fixation rack and each includes telescopic arms, a motor, and a drive rod. The actuators are disposed on other the two corresponding sides of the fixation rack to drive the movable frames to move toward or away from each other. The telescopic arms are kinematically connected to the motor through the drive rod to extend from or retract into the movable frame. The battery formation apparatus includes a motion synchronized multi-tier pallet rack, a conveyor module, a formation cabinet, and a controller. The conveyor module carries a battery module. The controller controls the pallet rack to obtain the battery module from the conveyor module and place the battery module in the formation cabinet.

Abstract: A unidirectional braking structure of a ratchet wrench comprises: a circoid surface with ratchet teeth disposed on the surrounding wall of an accommodating space at the working end of the wrench; a work piece wheel disposed in the accommodating space of said wheel; a plurality of restricting grooves, equidistantly disposed on the work piece wheel corresponding to the circoid surface with ratchet teeth; a plurality of direction restricting members disposed in the restricting grooves one by one, having a wheel teeth latching end to be engaged with the circoid surface with ratchet end; a plurality of springs disposed between the bottom of the restricting groove and the direction restricting member; such structure enables the present invention to enhance the torque of the wrench, reduce the loading of direction restricting member and the probability of damage, and have the merits of facilitating the manufacturing and assembling.