Patent ID: 8109163
Filing Date: 2012-02-07
Classification: B64C,F16H,Y02T,Y10T

Abstract:
1. An actuator comprising a first, motor driven actuator arrangement and a second actuator arrangement, the first actuator arrangement comprising a first component and a second component and being operable to allow relative axial movement to occur therebetween, the second actuator arrangement comprising a third component and a fourth component and being operable to allow relative axial movement to occur therebetween independently of the operation of the first actuator arrangement, brake means operable to prevent extension of the second actuator arrangement, and damping means operable to control the rate of extension of the second actuator arrangement; wherein the second and third components are secured to one another or integral with one another, forming an inner sleeve located between and co-operable with an outer sleeve and a shaft forming, respectively, the first and fourth components, and wherein the inner sleeve is keyed to a rod upon which part of the damping means is mounted such that the damping means damps rotation of the inner sleeve.