| 摘要 |
An articulated stand contains two relatively mutually pivotable arms at whose ends there are seated moveable joint heads. With the aid of a single clamping lever there can be concurrently locked or loosened a central joint as well as the joint heads. In order to increase the force transmitted from the articulated stand, there is provided an axial bolt or king pin which, upon clamping, presses on a ball through a curve and thereby through intermediate elements fixes a joint head in the first arm through frictional contact. A sleeve which is seated on the axial bolt exerts an effect through a curve on a ball of the second arm and transmits the resultant movement during clamping to the joint head of this arm. During clamping there are concurrently pressed together two disks of the central joint. The articulated stand is suitable, for example, for applications during surgery, as well as a retractor. It can be equipped with a prestressed spring so that the arms will not immediately tip down upon loosening of the clamping lever. |
