| 摘要 |
PURPOSE:To improve the extent of working properties by having an insert bored itself by a stroke, and cutting the tip into an acute angle so as to enable it to be set to a deck plate. CONSTITUTION:When the top of an insert body 1 is struck, a deck plate 7 is bored by the acute angular tip, thus it is pierced into the body 1. Next, a part of the deck plate 7 is further cut open by a blade 4a, and thereby an upper plate 3 hits on the deck plate 7 so that its insertion is stopped. Then, the body 1 goes backward by dint of repulsion of a spring 2, and the blade 4a comes into contact with the deck plate 7. |
