| 摘要 |
The one-piece lever (1) has at one end an inclined further lever (4). At the top it connects the arms (2,3) with a sprung transition piece (10), and at the bottom with a thin articulated such piece (11). It transmits with pressure the relatively right-angled movement of a hand to the movable part of a piston (5). - This piston has a metal facing (6) provided with a patterned surface which processes the needle (7) against a counterpiece in the lower arm (2). It is provided with a metal part (9) equipped with a patterned grip surface. Between the rear part of the arms is a stop mechanism (12) with one or more positions (13), where the upper arm (3) is retained in a tensioned position and an inner free position in which a stop (13') is released. This allows the one arm (2) to move back and the piston (5) to open its grip. |
