Patent ID: 6739004
Filing Date: 2004-05-25
Classification: A47C,Y10T

Abstract:
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 (2) and/or legrest section (4) in a bed or mattress support, said actuator comprisingan electric motor (20) which is connected by a drive shaft to a transmission which is in turn connected by a power take-off to a planetary gear (25) with 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 (47) 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 (49) and the intermediate ring (50) as well as the sun wheel (54), and wherein the intermediate ring (50) has a mounting bracket (11) for connection with one part of the structure, and wherein the outer rings (49) or their rigid connection has a mounting bracket (12) for connection with the other part of the structure.