Patent ID: 9071122
Filing Date: 2015-06-30
Classification: B67B,H02K

Abstract:
1. A drive unit for rotationally and linearly moving a working element with respect to a first housing element, the drive unit comprising: a threaded spindle arranged within the first housing element, the threaded spindle including a threaded nut rotatably mounted in the first housing element, the threaded spindle fixed to the working element; a first motor secured within the first housing element and having a primary part and a secondary part; a second motor secured proximate the first housing element and having a primary part and a secondary part; and, bearing means secured proximate the first housing element and which, in the case of the first and/or the second motor, is operatively arranged to allow for the primary part and the secondary part of the motors to be arranged in an axially non-displaceable manner with respect to one another when the working element is moved linearly in relation to the first housing elements; wherein the working element is moveable linearly in a first direction by the first motor driving the threaded nut and the second motor providing a first counter-torque to the working element; and wherein the working element is moveable linearly in a second direction opposite the first direction by the first motor driving the threaded nut, the second motor driving the working element, and the first motor providing a second counter-torque to the working element.