Abstract: A depth control includes an actuator tube connected for movement with the rockshaft and having a threaded crank supported on the forward end of the tube. A valve operator bracket is slidably and nonrotatably received over the tube and includes a threaded portion engaging the crank threads to positively locate the bracket relative to the tube. The bracket carries a plunger which, as the rockshaft lowers the implement to the working position, is moved into contact with a valve actuator to close a valve and prevent further lowering of the implement. One turn of the crank gives the same positive movement along the tube each time the depth setting is adjusted so that working depth can be set very accurately and easily.

Abstract: A first tube of rectangular cross section is joined to a second tube by notching the first tube on two sides to assure that the top and bottom walls of the first tube touch the rounded corner of the second tube at a central location to define a weld receiving groove and to eliminate the gap between the abutted tubes for repeatable, well defined welds. To avoid large fixtures and structural locators adjacent a weld location, a small tab is provided in the notched end of the first tube. An oversized laser-cut slot in the side of the second tube receives the tab and has one slot boundary precisely located with respect to a reference point on the second tube. The first tube is urged in the direction to force the tab against the boundary and positively locate the first tube with respect to the reference point.

Abstract: A combination tillage and incorporating implement having widely spaced sweeps in several rows at the forward portion of the main frame with tow trailing rows of angled spider wheels supported in pairs, for ground contour following ability and ease and flexibility of manufacture, by rockable arms extending rearwardly from the frame. Spray nozzles or the like, positioned rearwardly of the sweeps and forwardly of the spider wheels, apply material to the soil loosened and leveled by the sweeps to eliminate banding and uneven application otherwise causded by sweeps parting the soil or by material being deposited on rough ground surfaces. The rotational axes of the wheels of each row are parallel and angled with respect to the transverse direction with the rear row of wheels being angled in the opposite direction to that of the leading row to provide aggressive mixing and smooth uninterrupted soil flow across the width of the implement.

Abstract: A simplified method of assembling a disk from the ground up by first assembling disk gangs and then connecting the disk gangs together to provide a self-standing front and rear main disk gang pairs. The main frame is assembled over main disk gang pairs after which wheel modules are attached. Disks of different sizes are assembled, utilizing generally identical main frame beams with the same connecting locations, by decreasing the distance between the forward and rear gang pairs and moving the main frame beams outwardly as the desired width of the disk increases.

Abstract: A rotary incorporator for one pass incorporation of chemicals or small grains in previously tilled soil. The incorporator includes two rows of aggressive, large diameter spider wheels supported from a toolbar for rotation in the soil about axes offset at an acute angle to the transverse direction. The spider wheels, arranged to balance the forces transmitted to the toolbar, are angled in opposite directions on each half portion of the implement, with the wheels of the trailing row angled in opposite direction to and offset transversely with respect to the forwardly adjacent wheels in the forward row. The innermost wheels of each of the two rows are more widely spaced and smaller in diameter than most of the remaining wheels, and two additional smaller diameter spider wheels are centrally located between the innermost wheels and cooperate therewith to provide good incorporation and a smooth seed bed without hilling or chemical banding.