Abstract: Row marker assemblies are pivotally mounted near the ends of a tool bar adapted to carry various types of implements. A pair of marker control arms near the center of the tool bar are connected with the two marker assemblies for controlling the raising and lowering of the latter. A single hydraulic cylinder interconnects the control arms and regulates their movements in cooperation with gravity-responsive pivoted latch bars on the control arms. The latch bars are alternately engaged with a stationary keeper attached to the tool bar and are alternately separated therefrom by a camming and lifting action of each latch bar in response to retraction of the single cylinder, the lifting of each latch bar serving to release the opposing latch bar from the keeper, and the first latch bar then moving by gravity into positive locking engagement with the keeper. Rotational elements, springs and other external controls on the two cooperating latch bars are eliminated.

Abstract: A two position drain valve or cock is installed permanently in the threaded drain plug opening of an automotive crankcase. The spherical rotary valve element is operated by a crank arm arranged exteriorly of the valve casing on a valve actuating rotary shaft. The crank arm is shifted between valve open and valve closed positions by a push-pull cable assembly including a manual lever pivoted to a mounting bracket which is installed under the hood of an automobile at a conveniently accessible location. Detent means is provided to lock the manual lever in a valve closed position. The shipping package containing the apparatus in kit form may be utilized to receive the dirty oil.

Abstract: A device installable on all sizes of vehicle wheels, such as automotive and aircraft, to automatically and substantially permanently compensate for wheel imbalance due to uneven tire wear, unbalanced tire construction, and other known factors which effect wheel balance. Centrifugal force activated, freely circulating weight components within the annular tube body of the device tend to remain at the balanced wheel positions when the wheel is at rest. The device is applicable to single or dual wheels and other rotating bodies subject to dynamic imbalance.

Abstract: A concrete construction form embodies separable panels each equipped with attached longitudinal metal frame members and plural transverse braces. Four identical panels with the attached metal components are assembled to form a self-squaring column form which is reusable indefinitely after separation of the panels. The form is secured in the assembled state by a plurality of easily detachable spring steel assembly clips applied to the transverse braces at the four corners of the form. Strength, tightness and a reduction of labor are prime features.

Abstract: A container for perishable articles or substances includes a replaceable closure member capable of forming an airtight seal with a body portion of the container. An evacuation valve is provided on the closure member or another accessible part of the container allowing substantially complete evacuation of air trapped therein after closing the container. Means is also provided to relieve the vacuum to facilitate reopening of the container. The invention is applicable to household containers for foodstuffs as well as industrial containers for chemicals, pharmaceuticals and other materials requiring an air-free environment.

Abstract: A carriage-mounted sewing machine with special stitch forming means and an advance power trimmer are driven as a unit along the rails of a railway sewing machine bed by operation of the sewing machine motor and a unique clutch arrangement coupled with the carriage train drive for the railway bed. The stitching mechanism features an improved looper arrangement whereby precisely the necessary degree of slack is produced in the butt seam stitches to enable the spliced carpet sections to "butt out" perfectly without a gap and without overlapping at the butt seam or buckling. A specialized presser foot and throat plate arrangement allows the butt seaming of carpet sections up to two inches in total thickness. Carpet scrap is reduced to a minimum.

Abstract: An essentially all-plastic lightweight buoy is ideally suitable for use as a lighted discrepancy buoy. It is resistant to sinking due to damage from water traffic, floating debris or firearms. The buoy is virtually maintenance-free. It features a relatively large disc-like flotation body having a dependent free flooding ballast tube which carries mooring elements. A vented plastic battery housing is provided on the body of the buoy above the ballast tube. An elevated lantern support and leg structure is also secured to the flotation body as a rigid unit.

Abstract: A concrete block simulating a Norman brick is formed with two large cores separated by a central web. The cores are adapted to receive insulating foam during manufacturing of the block. Each block is grooved in its opposite ends and recessed in its central web for the reception of wedge elements or keys formed of plastic or the like. Adjacent blocks in each course are interlocked and the courses of walls constructed from the blocks in either a stacked bond or running bond are mechanically interlocked and properly aligned. Epoxy cement is utilized for bonding of courses in a customized wall or in prefabricated panel sections utilizing the interlocking block.

Abstract: The utility and range of application of conventional electrical limit switches is greatly increased by the provision on the pivoted switch actuating arm or lever of a unidirectional actuator attachment. The attachment element is pivoted to the arm and cooperates with a stop lug on the arm to render the element active for moving the switch actuator arm in response to engagement of the element by an object moving in one direction relative to the element. When the element is engaged by an object moving in the opposite direction, it yields relative to the arm and is incapable of moving the arm to actuate the switch. In an alternate operating mode, the attachment element may be rendered rigid with the switch arm to form an effective extension thereof.

Abstract: A plurality of foraminous wedge-shaped tobacco leaf containers with leaf impaling means are arranged in a circular array on a plenum foundation having connections with an external burner and blower assembly. A center passage for hot curing air is surrounded by the array of containers and the air flows radially outwardly through the containers and tobacco leaves with the leaves oriented edgewise to the air flow. A return annular air passage surrounding the containers leads back to the plenum and exterior burner and fan assembly. The exterior wall of the apparatus is insulated to confine heat. The air circulation may be reversed in the apparatus.

Abstract: A pre-programmed electronic calculator and method for "proving" gas meters and the like by controlling a prover bell, receiving electrical clock pulses relating to unit volumes respectively measured from a prover bell and from a gas meter under test attached to the prover bell whereby exact unit volumes are measured as units of time, calculating the relationship (ratio) of one measured volume to the other and displaying the numerical quantity of this ratio as a percentage.