Patent ID: 7162962

Claim:
In a pneumatic seeding machine, the improvement comprising: a mobile cart supporting a seed reservoir, a plurality of conduits, and a blower for producing airstreams within the conduits for conveying seeds from the reservoir toward a downstream point of delivery; a seed planting implement disposed for receiving seeds from said cart and placing them in the ground, said implement including at least a pair of supply hoses for delivering seeds entrained within airstreams in the hoses to a corresponding pair of distribution devices; and a coupling assembly detachably connecting said conduits of the cart with the implement in a manner to establish flow communication between the conduits and the hoses, at least one of said hoses being shorter than the other, said coupling assembly including a flow restrictor disposed to produce a pressure drop in the shorter hose to such an extent that the pressure in the hoses at said distribution devices is substantially equal notwithstanding the differences in length between the hoses.