Abstract: A wrench comprising (a) a catch, including teeth; (b) a fixed part defining a first jaw, the fixed part including two teethed parts permanently attached to the fixed part, the fixed part configured so that the two teethed parts intermesh with the teeth of the catch; (c) a moving part, defining a second jaw, such that the first jaw and the second jaw define the jaws of the wrench; and (d) a spring, whereby: (i) the two teethed parts attached to the fixed part which together serve as a guide for the moving part that is movable inside the fixed part, allowing the catch, the fixed part and the moving part to slide over one another; (ii) the catch is located in, and attached to, the moving part and selectively fixes the moving part to the fixed part; (iii) the spring pushes the catch in a direction perpendicular to the longitudinal axis of the wrench against the two teethed parts; and (iv) the fixed part serves as a gripping handle with a jaws of the wrench at its end.

Abstract: This is an invention that permits the construction of tools that are especially efficient, convenient, and economical. The tools in this invention are adjustable wrenches, a ring wrench, an open end wrench and a pipe wrench, intended for loosening and tightening bolts having heads of various sizes, while they accurately grip the head of the bolt. Ther wrench is adjusted to the bolt immediately in a continuous movmement. We refer to closed and open endede wrenched for suitable bolts, in metric of inch sizes, or a combination of these, as well as a pipe wrench. The current invention offers a wrench that requires only one hand to be used for loosening and tighetning any bolt, smoothly and preciesely, and without damanging the bolt itself. Adjustment to the size of the head of the bolt is done in a smooth and continuous movement, at the end of which the wrench is locked precisely on the size of the bolt.