Geof Gray,Jake Rozendaal,Frens Hoeve,John Mark Averink
申请号：
US14202594
公开号：
US09247687B2
申请日:
2014.03.10
申请国别(地区):
US
年份:
2016
代理人:
摘要：
A tillage apparatus having a rotary harrow mounted thereon with mounting elements utilizes a cooperative combination of: a compressible material at the mounting element to permit relative motion between the harrow and the mounting element in response to a motion of the harrow； and, a hydraulic actuator operated under a first pressure to lower the rotary harrow and maintain engagement of the rotary harrow with the ground. A pressure relief element is utilized to reduce back pressure in response to the harrow striking a hard impediment on the ground during operation of the tillage apparatus in a field. The combination cooperates to reduce damage to the harrow and/or other parts of the tillage apparatus when the harrow strikes a hard impediment such as a rock.
