Patent ID: 9033324
Filing Date: 2015-05-19
Classification: B23Q

Abstract:
1. A rotating cylinder, comprising: a main body; a piston head slidably received within the main body; a piston rod partially received within the main body, wherein the piston head is fixed to an end of the piston rod, the piston rod defines at least one guiding groove adjacent to the piston head, the guiding groove comprising a straight portion, a first helix portion and a second helix portion, the straight portion extending axially toward the piston head, the first helix portion curvedly extending away from the straight portion toward the piston head, the second helix portion curvedly extending from an end of the first helix portion toward a direction away from the piston head and the straight portion; and a guiding assembly mounted on the main body and comprising at least one guiding member engaging with the at least one guiding groove, wherein when the at least one guiding member reaches the second helix portion, the piston rod reaches a highest position and is rotated at about 45 degrees; when the at least one guiding member reaches an end of the second helix portion, the piston rod reaches a middle position and is rotated at about 90 degrees in a same direction to clamp a workpiece.