Spring cushion chisel plow shank assembly
US4520878A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1983 |
| Grant date | Jun 4, 1985 |
| Priority date | — |
| Expiry date | Jun 23, 2003 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01B61/046
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A spring cushion assembly for a chisel plow shank is provided that eliminates the transmission of force from the shank and assembly spring to the tension rod of the assembly in directions transverse to the axis of the tension rod, thereby prolonging the life of the entire assembly. The spring cushion shank assembly includes a support frame pivotally supporting a shank, a spring interposed between a portion of the frame and the shank, and a tension rod received within the spring in non-contacting relationship. A seat supports the lower end of the spring and minimizes the tendency of the spring to buckle by coupling the spring to the shank about a pivot axis and by continuously aligning the longitudinal axis of the spring in intersecting relationship with the pivot axis as the spring is compressed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.