| 摘要 |
The invention relates to a retractor having at least two retractor arms (1.1), the proximal end sections of which are fixed to or are integrally formed on the opposite ends of a length-adjustable transverse bar for adjusting the transverse spacing between the retractor arms (1.1), and having a drive unit (1.2), the housing (1.3) of which is mounted on the transverse bar and the transmission of which is operatively coupled to a length-adjustment mechanism of the transverse bar in order to be actuated manually by means of a separate actuating element (2) which can be brought into engagement with a transmission input element (1.4) that is inserted in the housing (1.3) in such a way as to be able to move, preferably in such a way as to be able to rotate, and which to this end is accessible from outside on at least one housing outer side. According to the invention, the transmission input element (1.4) is designed in such a way that it ends substantially flush with the housing outer side or is set back towards the housing interior relative to the housing outer side. It has cutouts (1.5) on its exposed side, at least one of said cutouts having an undercut (1.6) which, when the actuating element (2) is introduced into the cutout, comes into manually releasable latching engagement with a force-transmitting protrusion (2.1) which forms a latching edge (3.1) on the actuating element, so as to prevent the actuating element from being inadvertently pulled out. |
