Abstract: The assembly comprises an extension spring anchored at one end to a winch mounted to the door opening frame. A double-grooved pulley is mounted on a plate secured to the free end of the spring. A fixed second double-grooved pulley is mounted to the door frame. A pair of cables are anchored at one end to the door frame and extend in parallel to pass around the two pulleys. After the second pulley, the cables separate and extend down to the bottom corners of the door, to which they are secured. Upon release of the door latch with the door down, the spring contracts and, through the first pulley, applies an equal pull to the two cables so that they move at the same rate, thereby raising the door smoothly.

Abstract: The plunger of the valve has a ball of reduced diameter, so that it is inwardly spaced from the ribs of the cage. The plunger is centralized and guided by top and bottom stems attached to the ball and working in apertured webs carried by the cage and seat member. The cage has 3 ribs only, so that the windows are wider. As a result of these features the areas of the flow passage through the valve are increased. The stems are straight-sided and the web openings are circular so fluid may flush out solids packing between the stems and webs. The valve has been improved to increase flow capacity.

Abstract: The invention includes a process wherein a solid, substantially non-polymerized alkyl aldehyde mono urea is produced if methanol or ethanol is used as the solvent for each of urea and an aldehyde in a reaction carried out under basic conditions. The process is useful in connection with making the following novel compounds: isobutyraldehyde mono urea, isovaleraldehyde mono urea, 2-methyl butyraldehyde mono urea and valeraldehyde mono urea. The compounds are useful as feed supplements for ruminants as they produce microbial attack-inducing acids and slowly release ammonia in the rumen.

Abstract: A process is provided for enhancing the recovery of oil in a subterranean formation. The process involves injecting a surfactant-containing foam having oil-imbibing and transporting properties. A foam having such properties is selected either by determination of the lamella number or by micro-visualization techniques.

Abstract: The easel is a flat, generally diamond-shaped member formed of non-scratching stiff, resilient material, such as plastic. The member has a line of weakness extending thereacross between its opposed oblique angle points. The member can therefore easily be bent along the line of weakness to adopt a two-sided pyramidal form having rearwardly inclined, load-supporting edges and bottom edges. Means are provided along the load-supporting edges for disengageably supporting and frictionally interlocking with a picture frame or flat sheet to be displayed in spaced, non-scratching arrangement above a flat support surface, such as a table top. In the case of a channel-type picture frame, the means may comprise opposed L-shaped slots extending inwardly from each load-supporting edge a short distance above the bottom edge. The L-shaped slots form a T-shaped member. The T-shaped member can frictionally interlock with the base channel of a picture frame, to suspend the frame in a rearwardly inclined display position.

Abstract: Low molecular weight urea-formaldehyde reaction products are provided. Such products exhibit cold water solubility. They find use as a sustained nitrogen-release source for animals and plants. A three-stage process is provided for preparing the reaction products. The first stage comprises reacting urea and formaldehyde in an alkaline, alcoholic solution. Then the solvent is distilled off to form a melt. In the final stage the melt is polymerized to form the cold water soluble, low molecular weight reaction product.

Abstract: The stacker comprises a receiving bin adapted to position bolts close to the ground in an orientation that is perpendicular to the direction of advance of the stacker. The bin has side walls that closely confine the two ends of the bolts. A reciprocating plunger at the base of the bin biases the bolts rearwardly through an aperture into a stacking bin that trails the receiving bin. The stacking bin is open at the rear and at the bottom. Its parallel side walls closely confine the ends of the bolts collecting therein. The bolts biased rearwardly by the plunger are forced into the base of the stack in the stacking bin. The combination of the resistance of the ground-engaging stack, the confinement by the side walls, and the forced introduction of bolts into the base of the stack, induces a "boiling up" action of the bolts at the front end of the stack whereby they self-align themselves into a parallel state. When the bins are moved ahead, they leave behind an elongated stack of bolts.

Abstract: A device is provided for shearing an adherent layer of oil sand for removal from a major surface of a moving conveyor belt. A v-shaped formation of linearly-arrayed, spaced-apart, rotatable discs is suspended above or beneath the belt and brought into pressing engagement with the oil sand layer. As the discs rotate with the advancement of the belt, they function to cut through the layer, loosening it from the belt so it separates therefrom.

Abstract: A system is provided for installing, retaining and replacing the saw-teeth strip inserts of rotatable, cylindrical feedrolls, without concomitant damage thereto. More specifically, a plurality of circumferentially spaced, longitudinally extending grooves are formed in the body of the feedroll. Each groove is adapted to receive a pair of spaced, parallel saw-teeth strip inserts and maintain them at a predetermined position therein. A wedge is insertable into the groove between the inserts. The wedge is adapted to abut the lower portion of the inserts to clamp them against the groove side walls. A plurality of fasteners, such as allen head screws, are inserted through spaced, aligned bores formed in the wedge and are secured in the groove floor. The fasteners function to releasably secure the saw-teeth strips and wedge within the groove.

Abstract: The side rails of the chassis of a fixed bed truck are cut at the front end of the rear springs and pivotally interconnected using hinges incorporating hinge pins which are positioned below those side rails. A deck is secured to the rear section of the chassis for movement between a rearwardly inclined position and a lowered position in which it extends over the front section of the chassis. An apron is pivotally mounted on the rear end of the deck for movement between an extended ramp position and a retracted position in which it depends downwardly from the deck. Hydraulic apparatus are provided for tilting the deck, extending the apron and latching the deck in its lowered position. The hinges and the latching systems are constructed so that the truck can still be driven safely even after structural failure of both hinge pins.

Abstract: A rotary baler is provided, front mounted on a self-propelled power unit, to ground roll cylindrical bales of fibrous material. A pick-up assembly at the rear of the baler lifts the fibrous material from the ground to engage a generally vertical rear belt assembly which moves the material upwardly. Rotating discs at the upper end of the rear belt assembly deflect the material forward to engage a forwardly extending upper belt assembly which biases the material forwardly. The upper belt assembly is pivotally mounted at its rear end so that it can rotate with the expansion of the forming bale. Flexible lengths of cable hang down forward of the upper belt assembly; these cables act to shape and contain the forward portion of the forming bale. A spring-biased arcuate arm assembly, positioned intermediate the upper belt assembly and the cables, guides and compresses the forming bale once it has reached a pre-determined size.

Abstract: Ozone is dispersed in river water to be purified and used in a high pressure boiler. The ozone selectively degrades large organic molecules, dissolved in the water, which ordinarily will irreversibly foul the strongly basic anion attracting resin used to adsorb silicious contaminants from the water. The degraded molecules are reduced in resin-fouling capability and are removed from the resin during regeneration.

Abstract: A shock absorbing tool is provided having a low spring rate deformable element disposed in an oil bath in a sealed, annular chamber formed between the barrel and mandrel. One of the chamber seals is a floating seal, exposed to the drilling fluid outside the tool so that the pressure within the chamber is equalized with the hydrostatic bottom hole pressure. As a result, the tool is not pre-loaded, when lowered to the bottom of the well bore, leaving the most effective shock-absorbing capability of the element available to absorb the axial thrusts of the drilling bit.