Abstract: A lift system includes parallel connected cylinder circuits with cylinders mechanically tied together on a first lift wheel arm. The base end of a third cylinder connected to a second lift wheel arm is connected in parallel with the pair of cylinders. The rod end of the third cylinder is constrained for movement with the rod end of a fourth cylinder also connected to the second wheel arm. The rod end of one of the pair of cylinders is connected in series with the base end of the fourth cylinder to thereby constrain the third and fourth cylinders on the second lift wheel arm to move in unison with the pair of cylinders on the first lift wheel arm. Series cylinder circuits move the wing cylinders in unison with the main frame cylinders to keep the implement level. The hydraulic circuit is also plumbed to retract outer wing wheels during wing fold operations to eliminate outer wing wheel interference.

Abstract: Sweep retaining structure includes a spring wire retainer with a base supported in a groove on the underside of the wedge support which mates with a stem portion of the sweep. The wedge support is apertured, and a central curved portion of the retainer passes through the aperture and supports a sweep-contacting end above the surface of the wedge support. The end is biased toward a contact area on the sweep to engage the area and eliminate sweep loss problems by preventing the sweep from slipping downwardly from the mounted position. To remove the sweep, a tool is inserted through the slot to depress the retainer end, and the sweep is forced off the wedge support. A raised area on the sweep directs soil away from the retainer and contact area to reduce wear and eliminate depression of the end during operation. The underside of the raised area positions the wire end and provides bend-resisting support for the wire.

Abstract: Sweep retaining structure includes a retainer having a contact end biased towards the sweep. The sweep includes two or more spaced end-receiving areas to accommodate changes in the mounted sweep position. In one embodiment, the retainer is a wire made of spring steel having a contact end biased against the underside of the sweep. In one embodiment, the underside of the sweep includes a series of stepped portions. As the sweep is forced on the adapter on the shank, the contact end springs into retaining position on the stepped portion that aligns with the spring end when the sweep is in the mounted position. The sweep can be attached loosely by hand in an initial position with operating forces moving the sweep to a wedge locked position.

Abstract: A sweep removal tool includes a pair of claws with angled surfaces conforming to the top edge of the sweep stem to locate the tool and help distribute sweep removal impact forces. A retainer depressor centered below the claws moves the retainer to a release position and slides between the angled surfaces during sweep removal. The depressor shape assures desired tine contact, even when the sweep is at an extreme position in the range of possible mounted positions, while preventing damaging contact as the depressor moves relative to the retainer during sweep removal. A curved surface extends between the claws and the depressor and facilitates free pivoting of the tine about the claw contact points to depress the retainer. The tool bottoms against the sweep when the depressor is moved to the release position to prevent retained damage from removal impact forces.

Abstract: Sweep retaining structure includes a retainer having a contact end biased towards the sweep. The sweep includes two or more spaced end-receiving areas to accommodate changes in the mounted sweep position. In one embodiment, the retainer is a wire made of spring steel having a contact end biased against the underside of the sweep. In one embodiment, the underside of the sweep includes a series of stepped portions. As the sweep is forced on the adapter on the shank, the contact end springs into retaining position on the stepped portion that aligns with the spring end when the sweep is in the mounted position. The sweep can be attached loosely by hand in an initial position with operating forces moving the sweep to a wedge locked position.

Abstract: Stereoscopic patterns are disclosed which have a multiplicity of representations on a backing, with the representations spaced apart in substantially horizontal rows. The spacing between pairs of adjacent representations is varied to produce a stereoscopic effect. The resulting pattern is continuous, eliminating the ghost images associated with prior art stereoscopic pictures. The representations may be identical, may be varied shapes formed of identical elements, or may be a sequential series of perspective views of the same subject. The patterns may be viewed stereoscopically in either of two manners: by diverging or straightening one's line of vision while holding the pattern relatively close, or by converging or crossing one's line of vision while holding the pattern relatively far away. When viewed in the first manner, the patterns simulate distance vision while being held close-up, providing relaxing viewing to the eyes of one engaged in close work.