Abstract: To minimize loss of pressure energy in metering fluid flow by means of primary flow tube elements, the contour of the throat inlet section of the flow tube is that which produces a constant rate of acceleration of flow through the inlet to the throat section. The contour equation is given. At least in larger sizes of flow tubes, the inlet section is formed of thin metal such as stainless steel and arranged in such a way that it is not subject to mechanical stress in the installed assembly.

Abstract: Optimum concentration of the acid-scrubbing solution employed in a scrubbing tower for removal of malodorous and/or toxic gases from the air is maintained automatically in a control system which senses the electrical conductivity of the solution to control acid-feeding apparatus. High and low concentration alarms are also provided to warn of malfunction.

Abstract: The commanded rotational speed is compared with the actual rotational speed to produce a deviation signal. This deviation signal is multiplied by a coefficient which is determined by state variables (speed and intake pressure) of the engine and a proportional component plus an integral component of the multiplication product is employed as a control signal. This control signal is checked to make sure that it is outside critical engine states associated with the actual performance of the engine. On this control signal is superposed a signal representing the steady-state fuel flow associated with the commanded rotary speed (or under some circumstances the actual rotary speed) to determine the fuel flow rate to the engine.

Abstract: A spool valve is positioned within the reservoir of a hydraulic shock absorber. The valve body is secured to the pressure tube of the hydraulic cylinder and has openings aligned with ports therein. The spool has threads engaging threads on the valve body so that as the spool is rotated the spool is moved axially to cause the lands on the spool to cover more or less of the openings in the valve body. A rotatable shaft device extends radially through the external housing and into the reservoir. At its inner end the shaft device has a gear which engages a gear on the spool so that as the shaft device is rotated the spool also is rotated.

Abstract: Two parts are used each of which grips a respective, opposite wheel segment, much in the manner of a cowl. Each part includes a straight strip which lies against the outside of the wheel and a shorter straight strip which lies against the inside of the wheel. The adjacent ends of the inner and outer strips are connected by chains or by bands as are intermediate portions of the strips. The two outer strips are releasably connected on the outside of the wheel by diverse types of connections. In some embodiments, each part includes a bow lying against the outside of the wheel and connecting the ends of the outer strip of that part.

Abstract: A main body member having a head member bolted to one end defines the primary cylinder end portion of a single-ended hydraulic cylinder. A piston rod bearing insert is pressed into the main body bore which defines a cylinder bore. A piston is bolted to a piston rod which extends upwardly through the bearing insert. The piston rod bearing, piston and rod define the primary rod end portion of the single-ended hydraulic cylinder. The above mentioned components define the entire primary structure of a single-ended hydraulic cylinder system and as such provides the entire primary load bearing circuit of a hydraulic cylinder system. A housing member fits about a part of the main body member and the two define a hydraulic fluid reservoir. The piston return spring is an external spring surrounding the piston rod.

Abstract: A steel cable is stretched overhead between a starting platform and a terminal tower and equipped with a passenger pulley having a handle from which a child can hang while rolling along the cable. Only difficultly negotiable ladder means e.g., a chain or tire ladder, are provided for climbing to the starting platform to limit access to the starting platform to children having motor skills that are sufficiently developed to ensure safe use of the cable slide. An impact cushion may be mounted upon the terminal tower below the cable. Auxiliary recreational facilities are provided in the same structures to entertain children awaiting their turns and those who are interested observers.

Abstract: A fixture and method is disclosed for assembling and standardizing embodiments of fuel injection valves of the outward opening type and in particular those valves having a retainer connection between the stem of the valve closure and the compression spring urging the closure to its seated position which permits the stem to rock with respect to the end of the spring. The retainer connection is formed of one or more members of selectable thickness, or having a selectable stop ring height, wherein by use of the fixture a plurality of valves can be manufactured having substantially identical flow rate characteristics. A subassembly comprising the valve body, valve spring and valve closure are held in the fixture and a specified assembled load is applied to the spring. Measurements are made leading to a determination of the thickness to be employed for said member(s) to be assembled in that valve.

Abstract: A soil compactor has (1) an apparatus preceding it to measure characteristics of the soil significant to the compaction operation, and/or (2) an apparatus following it to measure characteristics of the soil after compaction. The soil compactor has one or more controls over the compaction operation. The controls are operated in accordance with the measurement indications of said apparatus.

Abstract: A small portable housing forms a trash compacting chamber in the bottom. At one side of the housing interior, above the chamber, is a space through which trash can fall to the chamber from an upper trash compacting opening. At the other side of the interior of the housing and above the chamber is the compacting mechanism powered by a hydraulic ram. This mechanism includes a carriage supporting a two-part platen, one part of which is below the ram and fixed to the carriage and the other part of which is articulated for movement between a vertical position when raised, and a generally horizontal position across said space when being lowered. Several lost motion mechanisms are disclosed for initially so moving the articulated portion as the ram is extended and thereafter providing carriage movement. A gate is mounted to swing across the space when the platens are lowered so as to catch any trash introduced at that time.

Abstract: An electrically operated auxiliary unit for driving a bicycle constructed to be attached to the bicycle frame and, by means of driving engagement created by the weight of the drive motor along a lever arm, propel the bicycle with a drive pulley. The unit includes a motor support frame including a horizontal bar located at one side at the top of the rear wheel of the bicycle and which is attached to the bicycle frame. A horizontal arm, pivotally mounted on the horizontal bar, extends tranversely over the rear wheel. A motor is mounted upon the horizontal arm with the center of gravity of the motor located on the opposite side of the wheel from the location of the horizontal bar. The horizontal arm acts as the lever arm, and driving engagement is created between the drive pulley and the wheel of the cycle by the weight of the motor.

Abstract: The multiple-throat venturi wet gas scrubbing apparatus embodies modular venturi entry apparatus and progressively finer demister vane sections in a horizontal scrubbing unit for in-line connection in gas stream piping or ducting and mounting with its stream propulsion fan on a single platform. The modular design of the entire apparatus is calculated to maximize standardization and prefabrication which together with the in-line design results in substantial cost and space advantages as well as optimum uniform flow throughout the apparatus.

Abstract: An identification tag for a dog, cat or the like is carried by a holder fastened to a collar, harness or leash. The holder comprises a transparent plastic pocket open at one end secured to the collar and overlaid by a protecting strap held in place by a rivet at one end and a snap fastener at the open end of the pocket permitting the strap to be lifted or rotated about the rivet to insert an elongated identification tag or to view identification information.

Abstract: Standard chemical laboratory glassware taper joints are retained by a threaded cap which, when screwed onto a male threaded part surrounding the female standard taper element with an O-ring surrounding the glassware part at the shoulder of the standard male taper holds the tapered surfaces together under resilient pressure to maintain tight closure at the taper interface. The O-ring, being compressed between the threaded retainer cap as the applied force, and the shoulder of the male taper element and the top of the male threaded part, as force receiving surfaces, provides a backup seal for the joint.

Abstract: The adjacent sides of adjacent screen frames have juxtaposed grooves therein. A rubber band seated in the adjacent grooves and encircling the adjacent sides serves as a hinge connecting the frames. The frames have inverted tee-shaped feet which are frictionally engaged in tapered sockets at the bottom of the frames, yet may be withdrawn and rotated ninety degrees.

Abstract: The closure for one end of a cardboard box comprises flaps extending respectively from opposite sides (at that end) and bent toward each other so that one flap overlies the other. The outer one of these two flaps has a longitudinal slot. The inner flap is cut and bent longitudinally to define a tab which extends through that slot and lies against the outer face of the outer of these two flaps. A third flap extends from a third side at the closure end of the box and is bent down to overlie the first two mentioned flaps and tab. The third flap has a tongue which extends into the box along side the first mentioned two flaps and is lockingly engaged therewith.

Abstract: A new control system is provided for a reciprocating fluid stroke motor of the type which is pressured at its rod end, reciprocation being achieved by intermittent exposure of its full blind-end face to the pressure fluid to overcome the pressure applied to its smaller rod-end face. The control means includes a valve for a passage through the piston, with adjustably-positioned trip-stops for shifting the valve between open and closed positions. The valve is biased to snap fully open when the piston movement toward its opening-stop opens it slightly and remain open until striking the closing-stop. Monostable or bistable trip-switch types of biasing means may be used, and unless one holding the valve closed with no fluid pressure is chosen, resumption of pressure supply after discontinuance will cause an initial retraction of the piston to its starting position, allowing time for the controlled apparatus to attain acceptable speed.

Abstract: The two bars that form the tubing gripper have tapered sides which mate with corresponding tapered faces on the two legs of the yoke. The direction of the tapering is such that as the flaring cone is forced against the end of a tube in the gripper, the tapered sides of the yoke legs cam the two bars of the gripper together to securely hold the tube in the gripper. A threaded bolt having a wing nut thereon is employed to initially press the bars of the gripper together with a sufficient force to hold the tube in the gripper while the yoke is put in place and the flaring cone initially pressed against the end of the tube.

Abstract: A tool for pulling an arrowhead out of, e.g., a tree trunk in which it is embedded comprises a flexible cable threaded at one end to screw into the shank of the arrowhead and a weight to bring a withdrawal impact force to bear at the free end of the cable. The weight may be affixed to the end of the cable or may be provided with a hole through which the weight may be guided along the cable for impact engagement with a stop on the end of the cable. The weight may be used for other purposes, such as holding the arrowhead for sharpening, straightening bent arrow shafts, and other purposes.

Abstract: A compact, multiple-element, high-fidelity speaker system for use in confined areas has electrically independent woofer, mid-range and tweeter elements mounted on a common frame with the mid-range and tweeter elements disposed in the conical volume of the woofer cone. Recesses in the woofer cone provide clearance for the drivers of the mid-range and tweeter elements.