Adjustable shear bar for a harvester cutterhead
US4190209A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 3, 1978 |
| Grant date | Feb 26, 1980 |
| Priority date | — |
| Expiry date | Jul 3, 1998 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01F29/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A forage harvester has a rotary cylinder type cutterhead mounted in a housing with opposite side walls, crop material being fed into the cutterhead in a generally radial direction over a shear bar adjacent the cutterhead periphery. The shear bar is mounted for fore and aft adjustment toward and away from the cutterhead periphery to maintain the optimum clearance between the cutterhead and the shear bar by means of a mechanism that includes a pair of bell cranks respectively pivotally mounted to support members on the opposite walls, with one end of each bell crank being connected to the shear bar through a fore and aft link while the other end of the bell crank threadably receives the threaded portions of a vertically elongated rod that is rotatably supported adjacent the housing side wall and has an easily accessible head adjacent the top of the housing, whereby rotation of the rod causes the bell crank to rock on its pivot to cause linear fore and aft adjustment of the shear bar. The force exerted through the adjusting mechanism is sufficient to overcome a clamping force exerted by a bolt and nut that clamps the shear bar to the supporting structure at opposite ends of the shear …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.