Friction bushing
View Patent ↗A friction bushing for being positioned on a shaft for friction-retarded rotation relative to the shaft, including a housing having a bore for receiving the shaft and a flange plate positioned on the housing around the bore. A plurality of flanges are carried by the flange plate and adapted for extending axially outwardly from the flange plate and along circumferentially-spaced apart areas of the shaft for frictionally-engaging axially-extending areas of the shaft.
1. A method for friction-retarded actuation of a passenger airplane cabin component, comprising:
providing a friction bushing, including;
a flange plate adapted to mount to a base rigidly coupled to the passenger airplane cabin component, the flange plate defining a substantially planar surface, wherein an aperture is defined in the planar surface and characterized by a circular perimeter adapted to align with an axis through a center of a bore hole in the base, wherein the flange plate includes at least two wall members adapted to engage the base and extend from one side of the base to the other, wherein;
a first wall member attaches to the substantially planar surface and is perpendicular to the substantially planar surface, and a second wall member is arranged to be substantially parallel to the substantially planar surface and attached to the first wall member, such that the flange plate is adapted to wrap around and be attached to the base, and
a plurality of flange members carried by the flange plate, each of the flange members extending axially outwardly from the flange plate and along circumferentially-spaced apart areas, wherein each of the flange members forms a cantilevered friction member that is adapted to exert, upon introduction of a shaft, a force on the shaft;
attaching the friction bushing to the shaft, wherein each of the flange members is adapted to apply a radially-inward force to the shaft caused by forces internal to the flange member which resist bending of the flange member imparted by the shaft; and
actuating the passenger airplane cabin component by applying force to rotate the base with respect to the shaft within the friction bushing, wherein the radially-inward force applied by each of the flange members is adapted to retard rotation of the shaft, thereby controlling an amount of force needed to actuate the passenger airplane cabin component.
2. The method according to claim 1 , wherein the flange plate includes at least two wall members adapted to engage the base and extend from one side of the base to the other, wherein a first wall member attaches to the substantially planar surface and is perpendicular to the substantially planar surface, and a second wall member is arranged to be substantially parallel to the substantially planar surface and attached to the first wall member, such that the flange plate is adapted to wrap around and be attached to the base.
3. The method according to claim 1 , wherein the flange members include respective enlarged terminal portions.
4. The method according to claim 3 , wherein the enlarged terminal portions of the flange members are thicker in a radially-extending direction than non-terminal portions of the flange members.
5. The method according to claim 3 , wherein the enlarged terminal portions of the flange members comprise about the outer 25 percent of the length of the flange members.
6. The method according to claim 3 , wherein the flange members collectively comprise about two-thirds of a circumference of the bore hole and spaces between the flange members comprise about one-third of a circumference of the bore hole.