# US 2019/0168558 A1 · Double wishbone independent trailer suspension > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0168558 A1 - Document ID: US20190168558A1 - Status: Published application - Kind: A1 - Application number: 16/325,147 - Filed: 2017-08-21 - Published: 2019-06-06 - Earliest claimed: 2016-08-22 - Assignees: Stemco Products, Inc. - Applicants: Stemco Products, Inc. - Inventors: Paul DOLAN; James Richard NEAL; Thor David SABGASH; Bradley Edward HADDIX; Christian Eugene LOUIS; Jason Douglas TRATO; Jeffrey Alan GEIST; Donald A. RAITZER - Web page: https://patentgrep.com/patent/US20190168558A1 ## CPC - B60G 5/04: with two or more pivoted arms, the movements of which are resiliently interrelated {, e.g. the arms being rigid} - B60G 3/20: all arms being rigid - B60G 7/001: {Suspension arms, e.g. constructional features (B60G7/006 takes precedence)} - B62D 21/02: comprising longitudinally or transversely arranged frame members - B60G 2200/144: with two lateral arms forming a parallelogram - B60G 2202/1524: with two air springs per wheel, arranged before and after the wheel axis - B60G 2204/126: Mounting of pneumatic springs - B60G 2206/011: Modular constructions - B60G 2206/0114: Independent suspensions on subframes - B60G 2300/02: Trucks; Load vehicles - B60G 2300/042: Semi-trailers - B60G: VEHICLE SUSPENSION ARRANGEMENTS (air-cushion vehicles B60V; {cycle suspensions B62K25/00}) - B62D: MOTOR VEHICLES; TRAILERS (steering, or guiding on a desired track, of agricultural machines or implements A01B69/00; wheels, castors, axles, increasing wheel adhesion B60B; vehicle tyres, tyre inflation or tyre changing B60C; connections between vehicles of a train or the like B60D; vehicles for use on rail and road, amphibious or convertible vehicles B60F; suspension arrangements B60G; heating, cooling, ventilating or other air treating devices B60H; windows, windscreens, non-fixed roofs, doors or similar devices, protective coverings for vehicles not in use B60J; propulsion plant arrangements, auxiliary drives, transmissions, controls, instrumentation or dashboards B60K; electric equipment or propulsion of electrically-propelled vehicles B60L; power supply for electrically-propelled vehicles B60M; passenger accommodation not otherwise provided for B60N; adaptations for load transportation or to carry special loads or objects B60P; arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q; vehicles, vehicle fittings or vehicle parts not otherwise provided for B60R; servicing, cleaning, repairing, supporting, lifting, or manoeuvring, not otherwise provided for, B60S; brake arrangements, brake control systems or parts thereof B60T; air-cushion vehicles B60V; motor-cycles, accessories therefor B62J, B62K; testing of vehicles G01M) ## Abstract Technology is provided for a double wishbone independent trailer suspension. The suspension includes a slider frame configured for attachment to a semi-trailer. The slider frame includes a longitudinal central beam and upper and lower clevis brackets located on opposite sides of the central beam. A pair of upper wishbones are attached to the upper clevis brackets and at least one air spring is positioned between the slider frame and each upper wishbone. A pair of lower wishbones are attached to the lower clevis brackets and a pair of spindles are each pivotably attached to a corresponding upper wishbone and a corresponding lower wishbone. ## Claims ### Claim 1 A double wishbone independent trailer suspension, comprising: a slider frame configured for attachment to a semi-trailer, the slider frame including a longitudinal central beam and upper and lower clevis brackets located on opposite sides of the central beam; a pair of upper wishbones each attached to corresponding upper clevis brackets; at least one air spring positioned between the slider frame and each upper wishbone; a pair of lower wishbones, each attached to corresponding lower clevis brackets; and a pair of spindles each pivotably attached to a corresponding upper wishbone and a corresponding lower wishbone. ### Claim 2 (depends on 1) The suspension of claim 1, wherein the pair of upper wishbones and the pair of lower wishbones are pivotably attached to the respective upper and lower clevis brackets with adjustable rod ends. ### Claim 3 (depends on 1) The suspension of claim 1, wherein the at least one air spring comprises two air springs. ### Claim 4 (depends on 1) The suspension of claim 1, further comprising a pair of shock absorbers each extending between the slider frame and a corresponding one of the pair of lower wishbones. ### Claim 5 (depends on 1) The suspension of claim 1, wherein the slider frame comprises a weldment and the central beam extends along a frame axis substantially parallel to a longitudinal axis of the semi-trailer. ### Claim 6 (depends on 5) The suspension of claim 5, wherein the upper wishbones are attached to the upper clevis brackets for rotation about an upper axis and the lower wishbones are attached to the lower clevis brackets for rotation about a lower axis. ### Claim 7 (depends on 6) The suspension of claim 6, wherein the upper axis, the lower axis, and the frame axis are substantially parallel to each other. ### Claim 8 (depends on 1) The suspension of claim 1, wherein the slider frame includes an air spring mount with left and right angled air spring plates, and wherein the upper wishbones each include an air spring mount positioned at an angle corresponding to an associated air spring plate, whereby the air springs are compressed along their respective axes throughout a majority of the suspension travel. ### Claim 9 (depends on 1) The suspension of claim 1, wherein the pair of spindles each comprises a weldment including an axle portion attached to an upper spindle clevis and two lower spindle devises each configured to connect to the upper and lower wishbones, respectively. ### Claim 10 (depends on 1) The suspension of claim 1, wherein the pair of upper wishbones and the pair of lower wishbones are pivotably attached to the respective upper and lower spindle clevis brackets with adjustable rod ends. ### Claim 11 A double wishbone independent trailer suspension, comprising: a slider frame configured for attachment to a semi-trailer, the slider frame including a longitudinal central beam and upper and lower clevis brackets located on opposite sides of the central beam; a pair of upper wishbones each attached to corresponding upper clevis brackets; a pair of air springs positioned between the slider frame and each upper wishbone; a pair of lower wishbones, each attached to corresponding lower clevis brackets; a pair of shock absorbers each extending between the slider frame and a corresponding one of the pair of lower wishbones; and a pair of spindles, each comprising a weldment including an axle portion attached to an upper spindle clevis and two lower spindle clevises each configured to pivotably connect to the upper and lower wishbones, respectively, with adjustable rod ends. ### Claim 12 (depends on 11) The suspension of claim 11, wherein the pair of upper wishbones and the pair of lower wishbones are pivotably attached to the respective upper and lower clevis brackets with adjustable rod ends. ### Claim 13 (depends on 11) The suspension of claim 11, wherein the slider frame comprises a weldment and the central beam extends along a frame axis substantially parallel to a longitudinal axis of the semi-trailer. ### Claim 14 (depends on 13) The suspension of claim 13, wherein the upper wishbones are attached to the upper clevis brackets for rotation about an upper axis and the lower wishbones are attached to the lower clevis brackets for rotation about a lower axis, and wherein the upper axis, the lower axis, and the frame axis are substantially parallel to each other. ### Claim 15 (depends on 11) The suspension of claim 11, wherein the slider frame includes an air spring mount with left and right angled air spring plates, and wherein the upper wishbones each include an air spring mount positioned at an angle corresponding to an associated air spring plate, whereby the air springs are compressed along their respective axes throughout a majority of the suspension travel.