# US 12,593,743 B2 · Trailing arm device and assembly with parallel linkage > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,593,743 B2 - Document ID: US12593743B2 - Status: Granted - Kind: B2 - Application number: 18/341,964 - Filed: 2023-06-27 - Published: 2024-02-01 - Granted: 2026-04-07 - Earliest claimed: 2016-01-25 - Assignees: Schaffert Manufacturing Company, Inc. - Applicants: Schaffert Manufacturing Company, Inc. - Inventors: Paul E. Schaffert; Kris Schaffert; Matthew Hornung - Web page: https://patentgrep.com/patent/US12593743B2 ## CPC - A01C 7/06: Seeders combined with fertilising apparatus - A01C 5/068: {Furrow packing devices, e.g. press wheels} - A01C 7/208: {Chassis; Coupling means to a tractor or the like; Lifting means; Side markers} - A01C: PLANTING; SOWING; FERTILISING (parts, details or accessories of agricultural machines or implements, in general A01B51/00 - A01B75/00) ## Abstract A trailing arm assembly includes a frame bracket attachable to a planter towing frame, a first frame, and a four bar parallel linkage connecting the frame bracket and the first frame with a first pivot and a second pivot on the frame bracket and a first pivot and a second pivot on the first frame. The trailing arm assembly also includes an adjustable biasing member extending from the parallel linkage to the frame bracket. The parallel linkage is connected between the first frame and the frame bracket such that the parallel linkage maintains a parallel orientation of the first frame. The adjustable biasing member is adjustably connected to a portion of the parallel linkage. ## Claims ### Claim 1 A trailing arm assembly for connection with a row unit of an agricultural planter, the trailing arm assembly comprising: a planter frame; a parallel linkage connected to the planter frame; a walking arm assembly pivotally connected to the planter frame via the parallel linkage, the walking arm assembly including: an articulating bracket connected to the parallel linkage at a walking pivot, the articulating bracket comprising a first end and a second end opposite the first end; a first closing wheel rotationally mounted toward the first end; and a second closing wheel rotationally mounted toward the second end such that: as the first closing wheel lifts, the second closing wheel drops and vice versa; and the walking pivot is disposed between the first closing wheel and the second closing wheel. ### Claim 2 (depends on 1) The trailing arm assembly of claim 1, wherein the walking pivot includes a torsion axle configured to resist a rotation of the articulating bracket about the walking pivot. ### Claim 3 (depends on 1) The trailing arm assembly of claim 1, further comprising a closer frame pivotally connected to the planter frame via the parallel linkage. ### Claim 4 (depends on 3) The trailing arm assembly of claim 3, wherein the walking assembly is pivotally connected to the closer frame via the walking pivot. ### Claim 5 (depends on 1) The trailing arm assembly of claim 1, wherein: the trailing arm assembly further comprises a closer frame configured for mounting one or more closing wheels thereto for rotation with respect to the closer frame and further comprising a connection portion; and the parallel linkage configured to pivotably connect the closer frame to the planter frame via a first pivot and a second pivot on a first end of the parallel linkage and to pivotably connect with the closer frame via a third pivot and a fourth pivot on a second end of the parallel linkage. ### Claim 6 (depends on 5) The trailing arm assembly of claim 5, wherein: the fourth pivot is disposed below the third pivot; and the walking pivot is disposed at or near the fourth pivot. ### Claim 7 (depends on 6) The trailing arm assembly of claim 6, wherein the walking pivot is disposed below the fourth pivot. ### Claim 8 (depends on 5) The trailing arm assembly of claim 5, wherein the parallel linkage is connected between the closer frame and the planter frame such that the parallel linkage maintains a parallel orientation of the closer frame with respect to the planter frame. ### Claim 9 A trailing arm assembly for connection with a row unit of an agricultural planter, the trailing arm assembly comprising: a planter frame; a parallel linkage connected to the planter frame; a closer frame pivotally connected to the planter frame via the parallel linkage such that the planter frame maintains a parallel orientation with respect to the closer frame; a walking arm assembly pivotally connected to the closer frame, the walking arm assembly including an articulating bracket connected to the parallel linkage at pivot assembly, the pivot assembly including a torsion axle configured to resist a rotation of the articulating bracket about the pivot assembly. ### Claim 10 (depends on 9) The trailing arm assembly of claim 9, wherein the torsion axle comprises: a housing: an axle shaft disposed within the housing; and one or more elastomeric biasing members disposed between the shaft and the housing. ### Claim 11 (depends on 10) The trailing arm assembly of claim 10, wherein the housing comprises a square or rectangular tube. ### Claim 12 (depends on 11) The trailing arm assembly of claim 11, wherein the axle shaft comprises a square or rectangular tube rotated about 45-degrees relative to the housing at rest. ### Claim 13 (depends on 10) The trailing arm assembly of claim 10, wherein the one or more elastomeric biasing members comprises an elastomeric cord. ### Claim 14 (depends on 9) The trailing arm assembly of claim 9, further comprising: a first closing wheel rotationally mounted toward a first end of the walking arm assembly; and a second closing wheel rotationally mounted toward a second end of the walking arm assembly such that: as the first closing wheel lifts, the second closing wheel drops and vice versa; and the walking pivot is disposed between the first closing wheel and the second closing wheel. ### Claim 15 A walking arm assembly for connection to a row unit of an agricultural planter, the walking arm assembly comprising: an articulating bracket pivotally connected to a frame of the row unit via a torsion axle assembly at a pivot assembly disposed between first and second opposing ends of the articulating bracket; a first closing wheel rotationally mounted toward the first end; and a second closing wheel rotationally mounted toward the second end; wherein the torsion axle assembly comprises a biased axle configured to resist a rotation of the articulating bracket about the torsion axle assembly. ### Claim 16 (depends on 15) The walking arm assembly of claim 15, wherein the torsion axle assembly comprises: a housing: an axle shaft disposed within the housing and defining an aperture; and an elastomeric biasing member disposed between the shaft and the housing. ### Claim 17 (depends on 16) The walking arm assembly of claim 16, wherein: the housing comprises a rectangular or square tube; the axle shaft comprises a rectangular or square shaft; and the torsion axle assembly further comprises four elastomeric cords disposed between the axle shaft and the housing, the four elastomeric cords including the elastomeric biasing member. ### Claim 18 (depends on 16) The walking arm assembly of claim 16, wherein: the housing defines a round aperture; and the biasing member is round and disposed in the round aperture between the axle shaft and the housing. ### Claim 19 (depends on 18) The walking arm assembly of claim 18, wherein the biasing member comprises a rubber bushing pressed into the round aperture. ### Claim 20 (depends on 19) The walking arm assembly of claim 19, wherein the rubber bushing is oversized for the round aperture.