| 摘要 |
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. The wrench is adjusted to the bolt immediately in a continuous movement. We refer to closed and open ended wrenches for suitable bolts, in metric or inch sizes, or a combination of these, as well as a pipe wrench. A number of tools exist for which patents have been registered, and that are intended for the same purpose. None of them is identical or similar to the tools referred to above. Those patents do not meet the following requirements that make the wrench efficient and convenient. They require the use of both hands, the tool does not grip the bolt precisely, firmly, and rigidly, and is awkward to use. The wrenches forming the subject of the current invention have a unique mechanism permitting convenient uses that do not exist in other patents. For example, they require the use of one hand only for all kinds of activities, they grip the head of the bolt totally accurately and rigidly, whether metric or inch bolts are used. The current invention offers a wrench that requires only one hand to be used for loosening and tightening any bolt, smoothly and precisely, and without damaging 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. The fact that the wrench acts on both its sides permits adjustment to a very large range of sizes of bolts. The method of the teeth in the tool permits adjustment to bolts in metric sizes, or alternatively, to inch sizes. |
