| 摘要 |
<p>The new adjustable wrench was conceived mainly for fastening and loosening nuts and bolts, based on a simple principle of friction cleats. The quick adjustable wrench is made of five principal parts: the handle (1), the cleat (2), a coil spring (3), the belt (4) and a pin (5); it has also a groove channel (6) into the cleat (2) for inserting the spring (3). A slope surface (7) on the handle (1) provides, with the angle of the cleat (2), the necessary friction force for the belt (4); this one keeps in place the other moving parts. There is a handle cover (8) that limits the belt-stroke .Due to the absence of the worm gear construction of the conventional adjustable wrench, there is no free-play after adjustment on the bolt head has been made, thus providing a safer and faster operation of fastening or loosening. It is an extremely useful hand mechanical tool intended for industries, mechanical-shops, automobiles and domestic shops. The conception of the invention leads to a very practical, versatile and reliable wrench, with a low cost of fabrication. </p> |
