| 摘要 |
<p>The invention concerns a tool (1) comprising a head (4) having at least two engaging surfaces (10) for driving the screwing member by its at least partially matching shape and means (5) driving the head in rotation. The head globally behaves as a single-piece part when the screwing member is driven in rotation. The head comprises a zone (7) linking the engaging surfaces and parts (9) transmitting to said engaging surfaces a rotation force applied on the driving means. The linking zone is located between the force-transmitting parts and the engaging parts. The head is designed such that the action of the rotational driving means on the force-transmitting parts tends to deform the shape of the head to bring the engaging surfaces closer to each other when a rotational driving force is applied via the driving means on the screwing member. The invention is, for example, applicable to flat open-end wrenches.</p> |
