Читать книгу The Handyman's Book of Tools, Materials, and Processes Employed in Woodworking - Paul N. Hasluck - Страница 39

An instantaneous grip vice is a very great improvement upon the wooden screw vice. Without any unscrewing it will take in anything, from a sheet of paper to a block 12 in. in thickness. Vices of this pattern apparently are not so widely known and used as they should be, and many a carpenter keeps to the old screw vice, although by the adoption of the parallel and instantaneous grip vice much time is saved, because this seizes and secures work instantly by the third of a turn of the hand, whereas with the old vice the jaws must be opened, perhaps with many a turn, to a sufficient extent, and then tightened with more turning, a contrast to the rapid and effectual action of the grip vice, whose rack can be thrown out of gear at once by an upward motion of the hand, and the front jaw pulled out, pressed against the wood, and then tightened in an immovable grip by a downward movement of the hand. The pattern shown in Fig. 96 is fixed to the bench from beneath as indicated, and the tops of the jaws are level with the surface of the bench; one-third of a turn of the handle releases the work. Like all the grip vices, its holding force is so great that if a long piece of wood be clutched by one end in the vice its weight will be powerless to alter its position in the vice in the smallest degree. There are but two working parts in the vice, the spiral H, and the short rack L.