| 摘要 |
<p>A rotary actuator, in particular for adjustable articles of furniture, including beds or mattress supports, for incorporation in a structure for adjustment of an element in it, e.g. adjustment of a backrest section and/or leg-rest section in a bed or mattress support, said actuator comprising an electric motor (20) which is connected by a drive shaft with a transmission (21), which is in turn connected by a power take-off with a planetary gear having a sun wheel (54) connected with the power take-off of the transmission, first and second internally toothed outer rings (49) which are rigidly interconnected and have the same toothing, an internally toothed intermediate ring (50) positioned between the first and second outer rings so that it can rotate about its axis relative to the outer rings, a plurality of planet wheels (51) in engagement with the two outer rings and the intermediate ring and the sun wheel, and wherein the intermediate ring has a mounting bracket (11) for connection with one part of the structure, and wherein the outer rings or their rigid connection has a mounting bracket (12) for connection with the other part of the structure. A strong and comparatively noiseless as well as relatively inexpensive rotary actuator may be provided hereby. It may be constructed with a jamming protection arrangement and emergency lowering function.</p> |
