MOUNTING TUBE FOR THE FURROW OPENER OF A PNEUMATIC SEED DRILL

摘要

A planting assembly is disclosed which comprises a tubular support arm for carrying a plowshare and for conveying seeds pneumatically. The front end of the support arm is pivotally mounted about a horizontal pivot pin perpendicular to the direction of displacement of the assembly. A spring acts in a vertical plane to exert a substantially constant force against the plowshare to drive it into the ground. The pivotal mounting of the support arm comprises a spring-loaded open-ended yoke for permitting rocking of the support arm in a horizontal plane when the horizontal couple exerted against the support arm exceeds a predetermined value. The front end of the tubular support arm is connected to a supply of air entrained seeds and the rear end to a cyclone separator separating the seeds which proceed through a conduit to the furrow cut by the plowshare, the main stream of entraining air being exhausted to the atmosphere.