Patent ID: 8939442
Filing Date: 2015-01-27
Classification: B25B

Abstract:
1. A double clamp vise comprising: a seat body, having a rear movable jaw with a first inner thread, a front movable jaw with a second inner thread, a fixed jaw between the two movable jaws, and a rail for being slidably engaged by the two movable jaws; a screwing rod, composed of a rear portion and a front portion, wherein a diameter of the rear portion is greater than that of the front portion, a first outer thread is formed on the rear portion, a step is formed between the front portion and the rear portion, the rear movable jaw is engaged with the screwing rod by screwing the first outer thread and the first inner thread; a screwing tube, telescopically and unrotatably sheathing the front portion of the screwing rod, formed with a second outer thread, wherein the front movable jaw is engaged with the screwing tube by screwing the second outer thread and the second inner thread, a spiral direction of the first outer thread is contrary to that of the second outer thread, and a recess is formed in a rear end of the screwing tube; a main spring, put around the front portion of the screwing rod and nipped between the step and an edge of the recess; a crank with a handle, axially connected to the front portion of the screwing rod for rotating the screwing rod; and a power assist module, flexibly fixed on an end of the seat body, and passed through by the front portion of the screwing rod for proving assistance to the screwing rod; wherein the power assist module has a base penetrated through by two fixing rods, each of the fixing rods is composed of a pin and a head, and tips of the two fixing rods are fastened into the seat body so that the power assist module can be slid along the fixing rods, a first adjustment spring is put around the pin of one of the fixing rods and between the base and the seat body, and a second adjustment spring is put around the pin with the first adjustment spring and between the base and the head.