# US 2021/0139291 A1 · Axial rotation damping mechanism > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0139291 A1 - Document ID: US20210139291A1 - Status: Published application - Kind: A1 - Application number: 16/937,212 - Filed: 2020-07-23 - Published: 2021-05-13 - Earliest claimed: 2019-11-08 - Assignees: Goodrich Corporation - Applicants: Goodrich Corporation - Inventors: Shyam Sundar S Iyer; Basavaraja Kotyal Mahadevappa; Sanith KurumpilavuSubramani; Bejan Maghsoodi - Web page: https://patentgrep.com/patent/US20210139291A1 ## CPC - B66C 13/04: Auxiliary devices for controlling movements of suspended loads, or preventing cable slack - B64D 1/22: Taking-up articles from earth's surface - B66C 1/34: Crane hooks - F16F 7/026: {resulting in the damping effects being different according to direction of rotation} - F16F 7/06: in a direction perpendicular or inclined to the axis of rotation {(F16F7/023 takes precedence)} - F16F 15/035: {by use of eddy or induced-current damping (dynamo-electric brakes of the eddy-current type H02K49/04)} - F16F 15/1292: {characterised by arrangements for axially clamping or positioning or otherwise influencing the frictional plates} - H02K 49/043: {with a radial airgap} - H02K 49/04: of the eddy-current hysteresis type - B66C: CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES ({specially adapted for lifting invalids A61G7/10;} rope, cable, or chain winding mechanisms, braking or detent devices therefor B66D; specially adapted for nuclear reactors G21) - B64D: EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT - F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION - H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53}) ## Abstract A damping mechanism may comprise a housing, a shaft, a spring arm assembly including a first spring arm, wherein the spring arm assembly is coupled to the shaft and configured to rotate in response to a rotation of the shaft, wherein the first spring arm extends relatively radially outward of the spring arm assembly toward the housing in response to the rotation of the shaft, and wherein the rotation of the shaft is damped in response to extending the first spring arm. ## Claims ### Claim 1 A rotational damping mechanism, comprising: a housing; a rotating member; a spring arm assembly including a first spring arm, wherein the spring arm assembly is coupled to the rotating member and configured to rotate in response to a rotation of the rotating member, wherein the first spring arm extends radially outward of the spring arm assembly toward the housing in response to the rotation of the rotating member, and wherein the rotation of the rotating member is damped in response to extending the first spring arm. ### Claim 2 (depends on 1) The damping mechanism of claim 1, wherein the rotation comprises a clockwise rotation and an anti-clockwise rotation, wherein the spring arm assembly comprises a second spring arm, wherein the first spring arm extends in response to the clockwise rotation of the rotating member, wherein the second spring arm extends radially outward of the spring arm assembly toward the housing in response to the anti-clockwise rotation of the rotating member, and wherein the clockwise rotation is damped in response to extending the first spring arm and the anti-clockwise rotation is damped in response to extending the second spring arm. ### Claim 3 (depends on 1) The damping mechanism of claim 1, further comprising a first friction surface disposed within the housing. ### Claim 4 (depends on 3) The damping mechanism of claim 3, wherein the first spring arm comprises a second friction surface, wherein the second friction surface contacts the first friction surface in response to the rotation of the rotating member and generates a friction brake force, wherein the friction brake force is proportional to a rotation rate of the rotating member. ### Claim 5 (depends on 1) The damping mechanism of claim 1, further comprising: a conductive non-magnetic member disposed within the housing, and a magnetic member disposed within the housing and configured to rotate relative to the conductive non-magnetic member in response to the rotation of the rotating member, wherein an eddy current brake force is generated between the conductive non-magnetic member and the magnetic member in response to the rotation of the rotating member, and wherein the rotation of the rotating member is damped in response to the eddy current brake force. ### Claim 6 (depends on 5) The damping mechanism of claim 5, wherein the conductive non-magnetic member comprises at least one of an annular ring or a disk. ### Claim 7 (depends on 5) The damping mechanism of claim 5, wherein the first spring arm comprises the magnetic member. ### Claim 8 A hook assembly for a hoist system, comprising: a housing; a bearing disposed within the housing; a hook coupled to the bearing and configured to rotate axially about the bearing; a spring arm assembly including a first spring arm, wherein the spring arm assembly is coupled to the hook and configured to rotate in response to a rotation of the hook, wherein the first spring arm extends radially outward of the spring arm assembly toward the housing in response to the rotation of the hook, and wherein the rotation of the hook is damped in response to extending the first spring arm. ### Claim 9 (depends on 8) The hook assembly of claim 8, wherein the rotation comprises a clockwise rotation and an anti-clockwise rotation, wherein the spring arm assembly comprises a second spring arm, wherein the first spring arm extends in response to the clockwise rotation of the hook, wherein the second spring arm extends radially outward of the spring arm assembly toward the housing in response to the anti-clockwise rotation of the hook, and wherein the clockwise rotation is damped in response to extending the first spring arm and the anti-clockwise rotation is damped in response to extending the second spring arm. ### Claim 10 (depends on 8) The hook assembly of claim 8, further comprising a first friction surface disposed within the housing. ### Claim 11 (depends on 10) The hook assembly of claim 10, wherein the first spring arm comprises a second friction surface, wherein the second friction surface contacts the first friction surface in response to the rotation of the hook and generates a friction brake force, wherein the friction brake force is proportional to a rotation rate of the hook. ### Claim 12 (depends on 8) The hook assembly of claim 8, further comprising: a conductive non-magnetic member disposed within the housing, and a magnetic member disposed within the housing and configured to rotate relative to the conductive non-magnetic member in response to the rotation of the hook, wherein an eddy current brake force is generated between the conductive non-magnetic member and the magnetic member in response to the rotation of the hook, and wherein the rotation of the hook is damped in response to the eddy current brake force. ### Claim 13 (depends on 12) The hook assembly of claim 12, wherein the conductive non-magnetic member comprises at least one of an annular ring or a disk. ### Claim 14 (depends on 12) The hook assembly of claim 12, wherein the first spring arm comprises the magnetic member. ### Claim 15 A aircraft comprising: an airframe; a hoist system coupled to the airframe; and a hook assembly coupled to the hoist system comprising: a housing; a bearing disposed within the housing; a hook coupled to the bearing and configured to rotate axially about the bearing; a spring arm assembly including a first spring arm, wherein the spring arm assembly is coupled to the hook and configured to rotate in response to a rotation of the hook, wherein the first spring arm extends radially outward of the spring arm assembly toward the housing in response to the rotation of the hook, and wherein the rotation of the hook is damped in response to extending the first spring arm. ### Claim 16 (depends on 15) The aircraft of claim 15, wherein the rotation comprises a clockwise rotation and an anti-clockwise rotation, wherein the spring arm assembly comprises a second spring arm, wherein the first spring arm extends in response to the clockwise rotation of the hook, wherein the second spring arm extends radially outward of the spring arm assembly toward the housing in response to the anti-clockwise rotation of the hook, wherein the clockwise rotation is damped in response to extending the first spring arm and the anti-clockwise rotation is damped in response to extending the second spring arm. ### Claim 17 (depends on 15) The aircraft of claim 15, further comprising a first friction surface disposed within the housing. ### Claim 18 (depends on 17) The aircraft of claim 17, wherein the first spring arm comprises a second friction surface, wherein the second friction surface contacts the first friction surface in response to the rotation of the hook and generates a friction brake force, wherein the friction brake force is proportional to a rotation rate of the hook. ### Claim 19 (depends on 15) The aircraft of claim 15, further comprising: a conductive non-magnetic member disposed within the housing, and a magnetic member disposed within the housing and configured to rotate relative to the conductive non-magnetic member in response to the rotation of the hook, wherein an eddy current brake force is generated between the conductive non-magnetic member and the magnetic member in response to the rotation of the hook, and wherein the rotation of the hook is damped in response to the eddy current brake force. ### Claim 20 (depends on 19) The aircraft of claim 19, wherein the conductive non-magnetic member comprises at least one of an annular ring or a disk.