Patent attributes
A friction brake assembly includes a brake housing; an input coupling element; an output coupling element; and a torsion spring. The input coupling element has an axial protrusion forming a partial cylinder wall with an angular gap over a defined angular range. The output coupling element has a projection protruding into the at least one angular gap, wherein the projection has an angular width smaller than the angular gap; wherein the torsion spring is a coil spring with coil ends forming two radially inward pins protruding into the angular gap in the input coupling element between the partial cylinder wall and the projection so that the projection is between the two inward pins. The torsion spring has a diameter that expands to form a friction lock with a surrounding cylindrical wall when the projection of the output coupling element engages and moves either one of the inward pins.
