Abstract: A pyridine derivative having the formula: ##STR1## wherein one of A, B, D and E is oxygen, sulfur, --SO--, --SO.sub.2 --, --NR.sup.3 --, ##STR2## or .dbd.CH-- with the rest being all carbon atoms; X is halogen, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, C.sub.1 -C.sub.4 haloalkyl, C.sub.1 -C.sub.4 haloalkoxy, C.sub.1 -C.sub.4 alkylthio, C.sub.1 -C.sub.4 haloalkylthio, C.sub.1 -C.sub.4 alkoxycarbonyl, C.sub.1 -C.sub.4 alkylthioalkyl, tetrahydrothiopyranyl, hydroxyl, CF.sub.3, phenyl or pyridyl; n is an integer of from 0 to 6,; W is oxygen or sulfur; R is hydrogen, di-lower alkylimino, C.sub.1 -C.sub.5 alkyl, C.sub.2 -C.sub.5 alkenyl, C.sub.2 -C.sub.5 alkynyl, C.sub.4 or C.sub.5 oxacycloalkyl, C.sub.2 -C.sub.5 mono-, di- or tri-haloalkenyl, C.sub.2 -C.sub.5 haloalkynyl, glycidyl, furfuryl, alkylthioalkyl, C.sub.3 -C.sub.6 cycloalkyl or a cation R.sup.1 is C.sub.1 -C.sub.4 alkyl, R.sup.2 is C.sub.1 -C.sub.4 alkyl or C.sub.3 -C.sub.6 cycloalkyl, or R.sup.1 and R.sup.

Abstract: An automotive vehicle engine having a coolant circulation system with a radiator, a fan, and a thermostatic valve for controlling coolant flow through the radiator. This thermostatic valve starts to open at a first temperature, is fully opened at a second temperature, and is partly opened at an intermediate third temperature. A system for coupling the fan to a rotation engine member includes: a first member rotationally coupled to the rotating member; a second member rotationally coupled to the fan; and a mechanism for providing rotational coupling between the first and second members. The degree of rotational coupling is lower when a first control valve is closed than opened, and is lower when a second control valve is closed than opened.

Abstract: A viscous fluid coupling including an input member having a disc-shaped rotor, an output member rotatable with respect to the input member and having a housing encircling the rotor, a partition wall in the housing for dividing the inside of the housing into an oil chamber and a working chamber. The rotor is located in the working chamber and a labyrinth device is provided between the rotor and the housing for making it possible to transfer rotation of the rotor to the housing under a supply of viscous oil to the labyrinth device. Perforations are formed in the partition wall for establishing a communication between the oil chamber and the working chamber so that the viscous oil can be supplied from the oil chamber to the working chamber. Oil expelling passages are also provided for connecting radially outward portions of the oil and working chambers so that the viscous oil in the working chamber is expelled to the oil chamber under pumping action of the rotor when the rotor is rotated.

Abstract: A cooling fan device for use with an internal combustion engine in which there is provided a viscous fluid coupling operable to control the speed of rotation of a fan for cooling a radiator in response to variation in the temperature of the engine. A partition plate is provided in a fluid-tight chamber so as to divide the chamber into a working chamber and a reservoir chamber. The partition plate has two holes which allow fluid flow from the reservoir chamber to the working chamber. Two valves, one for each hole, are provided which are normally biased to close the holes. One of the valves is attached to a slidable plug which moves in response to temperature change; the other valve is positioned to be engaged by the first valve. Changeover valves control the movement of the plug by allowing suction air pressure or atmospheric air pressure to enter a diaphragm at one end of the plug as the engine temperature varies and thereby open or close the holes.

Abstract: A cooling fan device for use with an internal combustion engine in which there is provided a viscous fluid coupling. A viscous fluid valve is operable to control the opening of a hole so as to regulate the flow of fluid from a working chamber to a reservoir chamber. The valve which is operated in response to the change in the temperature of the engine cooling water, is secured to a slidable plug which is surrounded by a diaphragm. A changover valve controls the admission of suction air (vacuum) or atmospheric air in response to the change in engine pressure.

Abstract: A temperature responsive viscous fluid coupling of the type having a bimetal coil secured at the outer end thereof to a cover member and at the inner end thereof to a rotatable shaft for controlling the fluid coupling is provided with at least one resilient member for engaging the radial outermost surface of the bimetal coil and an axially directed surface of the bimetal coil at a point circumferentially spaced from the outer end of the bimetal coil by approximately 150.degree..

Abstract: An induction heat cooking apparatus includes an inverter which generates ultrasonic frequency energy for heating a magnetic load by induction, and a small load detection circuit. The detection circuit includes a comparator which compares the input and output parameters of the inverter and latches a bistable device when the input power is smaller than the output parameter. The bistable device shuts down the inverter to prevent inadvertently placed small utensil objects from being excessively heated.

Abstract: A buckle for fastening a tape around a package, comprising in combination a rectangular frame portion with four sides defining a plane, a flat leg portion also defining a plane and a flexible connecting portion connected to said leg portion and to one of said sides forming a rectangular space, said leg portion being folded at said connecting portion so as to be inserted in said space and supported by said leg portion so that the planes of both said frame portion and leg portion may be substantially flush with each other, whereby a fastening band can be pressed and fastened between said leg portion and said frame portion when it is wrapped around said leg portion and inserted in said space.