VICE CAPABLE OF QUICK OR SLOW CLAMPING

The utility model relates to a vice capable of quick or slow clamping, which mainly comprises an automatic locking mechanism which is composed of a rolling needle, a deflector rod and a resetting spring, a metamorphism mechanism which is composed of a cam and a crank rotating shaft, and a positioning mechanism which is composed of a rolling ball and a positioning spring thereof. The vice can conduct rapid clamping, and also has all functions of a traditional old-type bench vice. By adopting the daedal and unique automatic locking mechanism, a half nut and a screw rod can be mutually engaged stably under the condition of strong clamping force according to a dynamics principle. The utility model with simple structure and easy manufacture is especially suitable for the situations requiring quick clamping and frequent and tiny adjustment to the size of a vice jaw.