Abstract: A trailer hitch guide intended for use in assisting the driver of an automotive vehicle to align, for hitching purposes, a trailer hitch ball, of the type conventionally carried by an automobile or other automotive hauling vehicle, with a trailer hitch socket, of the type conventionally carried on the tongue of a trailer, the guide being comprised of a pair of identical, highly visible and electrically lightable guide members, one of the guide members being adapted to be temporarily attached to the trailer tongue while the other guide member is adapted to be temporarily attached to the rear of the hauling vehicle whereby both guide members are highly visible through the rear window of the vehicle, during dim lighting conditions and at night as well as during daylight hours, to a vehicle driver seated in the driver's seat during the aligning operation.

Abstract: Coupling means for test tubes and the like, the coupling means enabling the coupling of test tubes to other objects or devices for various purposes, as for example, support purposes. In one embodiment of the invention, the coupling means is comprised of a flexible, resilient, tubular body portion which is open at each end and which is adapted to be slidably circumposed on a portion of the periphery of a conventional tubular test tube of the type that is closed at one end, the coupling means also including a pair of circumferentially spaced, flexible, resilient and integral flange portions which project longitudinally outwardly from one end of the tubular body portion and which define openings adjacent the free ends thereof adapted to receive a cooperating member such as the stem of a conventional funnel, a support rod, a thermometer or other object to which it is desired to couple a test tube. In another embodiment of the invention, the coupling means is formed integrally with the body portion of a test tube.

Abstract: An electrical primary control system for furnaces and method of making the same, the system comprising burner control means, an isolated low voltage control circuit and means for interfacing between the isolated low voltage control circuit and the burner control means; the interfacing means including a pair of resilient, magnetic reeds disposed within a hermetically sealed envelope, and a pair of electrically insulated independently wound coils having a differential in ampere turns and encompassing the envelope, the magnetic flux generated by such coils being additive whereby energization of both of the coils is required to close the contacts but energization of one of the coils is sufficient to maintain the contacts closed, at least one of the coils having a resistance wire of predetermined calibrated resistance electrically connected in parallel circuit therewith.

Abstract: A smoke detector and alarm system incorporating means for detecting airborne particles of smoke and activating an alarm for fire warning purposes, the system including an illuminating circuit having a light emitting diode therein, a smoke sensing and compensation circuit having a pair of photo-electric cells incorporated therein, a comparator and a trigger circuit, and an alarm circuit.

Abstract: A solid state ignition system particularly adapted for use in igniting fuel oil, the system including plasma generator means, electronic trigger means and electronic brake means and being effective to produce an improved ionization arc between electrodes for the purpose of initiating fuel oil combustion.

Abstract: An expander tool for truing thin walled tubing, the tool including improved means for equalizing expansion forces applied to expansion elements and other interrelated components incorporated in the tool, the tool also including improved clutch means for preventing over expansion of the tool and improved means for releasing the expansion elements and interrelated components when forces tending to expand the tool are reduced.

Abstract: An improved tool for pressure generating teeth on the periphery of a cylindrical workpiece and an improved method of making such tool, the tool being provided with tooth forming teeth having a unique configuration which increases the strength of the teeth on the tools and the useful life of the tools. The method comprising alternate steps of dressing the periphery of the forming wheel and advancing the forming wheel into additional sections of the tool body.

Abstract: A downrigger for use in maintaining terminal fishing tackle at a desired depth in the water, the downrigger including a base housing indexably mounted on a base adapted to be fixed to a water craft, the base housing carrying a telescoping extensible boom which may be moved to an unobtrusive position when not in use and which also incorporates improved means for preventing jamming of the trolling weight cable during trolling operations. The base housing also carries a cable reel having a single crank handle readily adaptable for either right or left hand use, and the base housing includes means for securely holding a fishing rod during trolling operations while permitting the fishing rod to be easily and quickly released from the downrigger when a fish strikes.

Abstract: A solid state oil burner safety control system with integral ignition and particularly adapted for use with a motor powered oil burner, the system providing intermittent ignition, timed safety shutdown, motor starting capability and automatic restart in the event of combustion failure. The system is also adapted to prevent burner motor starting if the line voltage is below a predetermined value.

Abstract: An electrical control housing and support package including a mounting base, a support member floatingly mounted on said base and a cover secured to said base, said package having improved heat sink, heat transfer and heat dissipation qualities, providing improved environmental protection and support for the components of electrical control systems, and also being susceptible of manufacture and assembly with automated techniques.

Abstract: A solid state primary control and ignition system for oil burners, the system including burner control means, an isolated low voltage control circuit, plasma generator means, combustion initiation means and combustion sensing means, and being effective to provide improved intermittent ignition and improved control for initiating and supervising the combustion of fuel oil in furnaces.

Abstract: A solid state stack switch control system for furnaces and the like including burner control means, means including solid state means effective to control said burner control means in response to thermally actuated, magnetically operated heat detection means, line voltage safety switch means, and means for interfacing between an isolated low voltage control circuit and said burner control means.

Abstract: A snow skiing device enabling the use of a single snow ski to support both feet of a skier for Alpine snow skiing and especially slalom snow skiing, the device including means providing a limited universal and automatically releasable connection between one of the skier's boots and the ski at a position disposed rearwardly of the skier's other boot which may be retained by a conventional automatically releasable binding. The limited universal and automatically releasable connection may also be adjusted longitudinally of the ski to meet physical and various skiing requirements of the skier.

Abstract: Primary control means for furnaces and the like including burner control means, means including solid state means effective to control said burner control means in response to a flame detector signal, bimetallic safety switch means, and means for interfacing between an isolated low voltage control circuit and said burner control means.