Patent ID: 8651458
Filing Date: 2014-02-18
Classification: B21D,B25B,F04B

Abstract:
1. A hand-operated vacuum pulling device, comprising: an elongate shank, over which a backward ram is slidably fit; a suction cup, which is coupled to a front end of the elongate shank; and a handgrip, which is coupled to a rear end of the elongate shank and comprises a pressure relief seat and a piston assembly movably received in a cylinder formed in the handgrip, a tube being received in and extending through the elongate shank and connecting between and in communication with the cylinder of the handgrip and the suction cup, the pressure relief seat forming a ram stop section at a joint with the shank, the handgrip having a rear end to which a ring-shaped cover assembly is attached, whereby the piston assembly is operated to induce a vacuum inside the cylinder, and the ring-shaped cover assembly is subsequently usable to pull the piston assembly backward for further operation in order to make a spring contained inside the piston assembly stiffer and increase a suction force of the suction cup, the backward ram being selectively movable backward to induce a backward impact for enhancing pulling effect.