Abstract: Apparatus for cutting vegetation with a rotatable head carrying a non-metallic cutting line extended into a cutting plane. Additional line is extended from a supply line coil within the head into the cutting plane without independent operation action. A mechanism in the head feeds a certain incremental length of line whenever the free end of the cutting line is reduced to this length by wear, or otherwise. After the cutting line length is extended to its original preset length, the cutting line is secured automatically against further extension from the head. The incremental line feeder mechanism is actuated by sensing an operating condition of the head, e.g., angular velocity of rotation.

Abstract: Process for medical treatment of fish using a medical compound where the medication is delivered directly of the water where the fish is raised/kept. The delivery of medication is performed from a separate container through a pumping device to a spreading nozzle in the seine.

Abstract: An improved setting tool is provided for positioning, setting, and releasing a liner in a subterranean wellbore. The setting tool includes a plurality of fingers, each biased for locking engagement with axially spaced recesses provided in the wall of the tool mandrel axially above a lowermost position of the liner hanger connecting nut. The fingers are automatically forced upward into a release position when interference rollers move radially out of their respective recesses and separate a plurality of axially movable sleeves. Premature release of the liner is avoided by positioning the recesses in the mandrel such that the fingers are in a lock position when the tool string is either in tension or compression. The liner can be rotated after setting the liner hanger, so that the setting tool and drill string can thereafter be reliably retrieved by simple axial pick-up.

Abstract: A cooking apparatus having a frypot or assembly for heating a quantity of cooking oil including well center section arranged to have enclosed burner assemblies disposed on each side of the center section and forming combustion chambers for the combustion of a fuel-air mixture introduced into combustion chambers under a forced air flow system. The combustion chambers are charged with a forced flow of a fuel-air mixture under positive pressure by a blower assembly mounted on a manifold on the front of the frypot assembly. The manifold includes respective air flow control valve gates which may be selectively adjusted to balance the charging air flow to the respective burner assemblies. The frypot has opposed sidewalls and a rear wall which form parts of respective flow passages for combustion gases leaving the combustion chambers.

Abstract: A gas delivery apparatus protection device that is used in combination with gas delivery systems. The gas delivery apparatus protection device is permeable to inhalation gases, but reduces the possibility of the transfer of undesirable agents from one user to another. These agents include pathogens, chemicals, cosmetics, drugs, viruses, bacteria and molds.

Abstract: A single cylinder internal combustion engine in a portable power tool is provided with a flywheel counterweight member which functions to substantially reduce engine vibration attributable to linear inertial and reactive forces of the engine's reciprocating mass (including its piston, piston pin, piston pin bearing, and connecting rod) when the piston is adjacent its top dead center and bottom dead center positions. The counterweight member is slidably mounted on the crankshaft, and is captively retained thereon closely adjacent the flywheel, by a retaining sleeve also slidably mounted on the crankshaft. Alignable dimples on the counterweight and the flywheel facilitate the installation of the counterweight in the correct rotational orientation on the crankshaft.

Abstract: A fire protective blanket construction providing multiple time protection for application to electrical conduit and cable trays to preserve operation of electrical circuitry carried by the cables in the event of exposure to fire. Comprising the prefabricated fire resistant blanket are back-to-back blanket sections separated by a moisture impervious metal foil. Disposed within the outer of the blanket section on the exterior side of the foil is a transversely extending envelope containing a selected thickness of trihydrated alumina in powdered form. When exposed to high temperature, the trihydrated alumina emits a steam vapor for protecting the article to which the blanket has been applied for a time period correlated to the thickness and other thermal properties of the individual elements comprising the blanket.

Abstract: A gasoline engine driven flexible line trimmer is provided with a modularly constructed power head section which significantly facilitates the original manufacturing assembly, and subsequent service disassembly, of the power head. In a clutch drive embodiment thereof, the power head has four readily separable modules--an engine module comprising a main engine shroud to which the engine is internally secured; a fan housing module; a starter module comprising a starter housing and a recoil starter mechanism retained therein; and a coupling module comprising a clutch housing carrying therein structure for operatively interconnecting the engine's clutch to the flexible drive shaft disposed within the trimmer shaft. In a direct drive version thereof, the power head has two separable modules--the engine module and a combined fan housing, starter and coupling module defined by a single housing within which the starter and coupling structure is carried.

Abstract: The pivotally mounted force input lever of a leg extension exerciser machine is connected by a chain, sprocket and cam system to a multi-element weight stack such that leg-driven pivotal motion of the lever may be resisted by a selectively variable portion of the weight stack. A counterbalanced foot engagement structure is pivotally secured to the outer end of the lever, and the lever is rotationally counterbalanced by a counterweight secured to its opposite end. User leg length adjustment of the machine is effected by pivotally adjusting the foot engagement structure relative to the lever, without shifting the center of gravity of the foot engagement structure, to thereby avoid disturbance of the rotational balance of the input lever. A resisted motion range adjustment mechanism is incorporated in the machine and is operative to selectively vary the weight-resisted angular start setting of the lever without altering the angular position relationship between the force input lever and the machine cam.

Abstract: A picnic trailer has a wheeled rear frame upon which picnic food preparation equipment, such as a hooded cooking grille, a sink and a burner plate, is operatively supported. An elongated towbar extends forwardly from the rear frame and is connectable to a suitable towing vehicle. A vertical support frame structure interconnects the rear frame and a longitudinally intermediate portion of the towbar, and carries a collapsible, roofed picnic table structure. A rear end portion of the towbar, and a pair of diagonally oriented towing brace members, are pivotally connected to the longitudinally intermediate portion of the towbar and are releasably connectable to the rear frame for towing purposes. When the trailer is parked, and the picnic table and roof portions thereof set up for use, the brace members and the towbar rear end portion may be swung away from the rear frame to form a convenient walkthrough area between the picnic table and the cooking equipment on the rear frame.

Abstract: A setting assembly tool suitable for suspension in a subterranean well by a wireline is provided for activating an inflatable packer. A downhole firing head with a combustion device is utilized for generating downhole a high fluid pressure in a passageway of the setting assembly tool, with the passageway being in fluid communication with the packer for setting the packer. In response to a pressure buildup of a predetermined level, fluid pressure is dumped from the passageway to the well while a check valve closes to retain the packer in the set position. To deactivate the retrievable packer, a conventional fishing tool supported by a wireless may be used to exert an axial force on a housing sufficient to move the housing relative to the packer and open a fluid port for discharging liquid from the packer. The setting assembly tool may be retrieved to the surface via the wireline immediately after the packer is set.

Abstract: A heat dissipating connector assembly is provided for use in retrofit applications to replace the electrical connector within the housing of an existing light fixture. In one embodiment thereof, the connector assembly includes a hollow, externally finned cooling body having a graphite foil-lined socket opening formed through a forward end portion thereof. The socket opening communicates with an enlarged cavity within a rear portion of the body which captively retains a connector formed from two stacked metal block pairs encapsulated within and separated by silicon insulating material. Pin openings are formed through the block pairs along the junctures between their individual blocks. Entry of the pins into the block openings slightly separates the blocks in each pair thereof, against the resilient force of the insulation material, to create an automatic "pin-wiping" action.

Abstract: A liquid level sensor connects a buoyancy device in a vessel to an end of one member of a two piece mechanical linkage projecting through a flexible pressure sealed opening in the closed end of the sensor body with the outer ends of the two members overlapping and connected by a pivot point. The second member is rigidly secured to a sensor body and defines a fluid pressure receiving passage which connects with a diametrically disposed bore within which a poppet valve is mounted. The poppet valve normally prevents the flow of pressure through the diametrical bore and outward through a radial outlet in the sensor body to actuate an alarm. Upon a deviation of the liquid level in the vessel from the desired level, the buoyancy device produces vertical pivotal movement of the one member of the two piece mechanical linkage which forces the poppet valve to a position permitting pressured fluid to flow therethrough and to energize an alarm.

Abstract: The method of fabricating threaded pipe joints to eliminate variations in tensile strength produced by tolerance variations in the wall thickness of a pipe. Such tolerance variations are eliminated by cold forming and then machining the entire lengths of both the pin and box ends of the threaded pipe joint. A precise mathematical relationship between the root diameter of the threads and the wall thicknesses of the pin and box portions of the pipe eliminates the creation of critical areas having reduced tensile strength.

Abstract: A combination pressing and initial baking system is provided for converting balls of dough into thin, flat discs, such as tortillas. A box-like support structure is provided having a portion of its frontal wall open and defining a mounting for a first heated pressing plate with its dough contacting face facing downwardly and disposed at a substantial angle to the horizontal. A second heated pressing plate is mounted on horizontal pivots in the box-like support structure for pivotal movement between a pressing position adjacent to and parallel with the downwardly facing surface of the first pressing plate, and a feeding position where the upper ends of the pressing plates are spaced apart to permit the insertion of a ball of dough therebetween. Movement of the second pressing plate to its pressing position effects the pressing and initial baking of the dough in a flat disc shape. The heat input to the dough disc during pressing determines the peripheral area and thickness of the resulting disc.

Abstract: Apparatus for testing a selected zone of a subterranean bore, which may comprise a subterranean uncased well bore, comprises a pair of inflatable packers mounted in spaced relationship on a tubular outer housing to define the axial extent of the selected zone to be tested. Fluid pressure passages for inflating the packers, for monitoring the fluid pressure between the inflated packers, and above and below the inflated packers, are defined by a plurality of peripherally spaced passages formed in a multi-section tubular conduit. The fluid passages in each conduit section do not extend axially beyond the ends of the particular section but communicate with peripherally spaced radial ports.

Abstract: Apparatus for cutting vegetation with a rotatable head carrying a non-metallic cutting line extended into a cutting plane. As the line extension decreases from an established preset length an actuator in the head permits additional line to be extended automatically from a supply source within the head. The actuator imposes a back pressure against the line of magnitude correlated to the sensed pull tension wanting to extend the line outward of the head. After the cutting line length is extended to its restored original preset length, the actuator in response to the operational forces imposed thereon secures the cutting line against further extension until a subsequent decrease in line extension is incurred. In one embodiment an inertial drag brake is activated during the course of line feedout and is deactivated after the length of cutting line has been fully restored.

Abstract: A plurality of packing elements are mounted in vertically spaced relationship on a tubing string with the spacing of the elements corresponding generally to the spacing of a plurality of sets of perforations in a well conduit. The lowermost packing unit is provided with radially expanding locking elements which engage a locking groove provided in the well conduit. All packing units incorporate expandable elastomeric sealing members and are set by the application of tension to the tubing string and are unset by the subsequent application of a higher degree of tension to the tubing string.

Abstract: An archery bow wrist brace has an externally padded, generally U-shaped rigid frame having an open front end which is anchored to a connecting bracket secured to a lower front portion of the bow handle. From their juncture with the bow handle the frame legs extend rearwardly of the handle to one side of the bow string and are positioned beneath the wrist and forearm of the archer's bow hand as it operatively grips the bow handle. The closed rear end of the padded frame is upwardly and rearwardly bent, and passes over and engages the forearm. Immediately in front of the bent rear frame end the padded frame legs are interconnectable with a tightening strap structure which passes beneath and engages the forearm. The bent rear frame end and the tightening strap structure cooperate to lock the forearm against appreciable transverse movement relative to the frame legs, thereby bracing the bow hand wrist and inhibiting undesirable pivoting of the bow body caused by string draw and release torques imposed thereon.

Abstract: A commercial/industrial washing machine is provided with a body section which is pivotable between a loading and washing position in which the body section is horizontal, and an unloading position in which the body is forwardly inclined at an angle of approximately 7.5.degree.. The body section carries a washing drum which is rearwardly and downwardly inclined at an angle of approximately 2.5.degree. relative to the body section and is provided with internal breaker ribs inclined at an angle of approximately 15.degree. relative to the drum axis. A loading chute is pivotally connected to the upper end of the body section and is movable between a raised position in which the chute is spaced apart from the drum opening, and a lowered position in which the chute outlet communicates with the interior of the drum, the chute being provided with a counterweight system to counterbalance the weight of the chute.