Abstract: A variable venturi-type carburetor comprising a vacuum chamber and an atmospheric pressure chamber which are separated by a suction piston. A needle is mounted on the central portion of the tip face of the suction piston. A suction hole, interconnecting the vacuum chamber to a venturi portion of the carburetor, is formed on the tip face of the suction piston at a position located upstream of the needle. The vacuum chamber is open to the atmosphere via a flow rate control valve apparatus when the engine temperature is low. The vacuum chamber is disconnected from the atmosphere by the flow rate control valve apparatus when the engine temperature is high.

Abstract: A variable venturi-type carburetor comprising a fuel passage which is open to an intake passage. An air bleed passage is connected to the fuel passage. The carburetor comprises an air bleed control valve device for controlling the flow area of the air bleed passage. The air bleed control valve device comprises a bore formed therein, a push rod slidably inserted into the bore for controlling the flow area of the air bleed passage, and a wax valve actuating the push rod. A cooling water passage is formed in the air bleed control valve device so as to surround the air bleed passage and the wax valve.

Abstract: A multi-gap spark ignition device to be installed in a spark ignition engine, is disclosed. The device comprises a metallic base member provided with a hole which forms one portion of the combustion chamber of the engine. Within the wall defining the hole, a high voltage electrode, a plurality of intermediate electrodes and an earth electrode are embedded at regular intervals so that each end of the electrodes project into the hole to form a plurality of spark gaps between the adjacent ends of the electrodes. Each of the intermediate electrodes is composed of an electrode member and an insulating member for covering one end of the electrode member, and is closely inserted into a groove formed in one end surface of the base member along the hole thereof at regular intervals.

Abstract: A whole body swingable clock wherein a clock body itself swings. This whole body swingable clock includes: a clock body swingably supported on a pendulum fulcrum and solidly secured thereto with a clock mechanism case housing therein a movement case; and a stationary receiving plate provided thereon with a magnet or a driving coil to be electromagnetically connected to a driving coil or a magnet provided on the movement case for generating a swinging driving force in the clock body. In this whole body swingable clock, the stationary receiving plate with the magnet or the driving coil is housed in a space formed in the movement case, whereby the clock body can swing with the stationary receiving plate with the magnet or the driving coil being hardly exposed to outside from the clock body.

Abstract: A variable venturi-type carburetor comprising a suction piston which has a tip face having an upstream end portion. A raised wall is formed on the inner wall of the intake passage. The upstream end portion of the suction piston cooperates with the tip edge of the raised wall to restrict the flow of air flowing within the intake passage. The upstream end portion of the suction piston has a V-shaped central portion and flat opposed end portions. The tip edge of the raised wall has a flat central portion cooperating with the V-shaped central portion of the suction piston and has opposed end portions cooperating with the flat opposed end portions of the suction piston and projecting towards the intake passage.

Abstract: A spark plug for internal combustion engines has center and grounded electrodes having surfaces disposed adjacent to a spark gap between the electrodes and directed to but spaced from each other and also have side faces converging toward the spark gap. Each of the electrodes is provided with a piece of a noble metal secured to the surface directed to the other electrode. The noble metal pieces provided on both electrodes define the spark gap therebetween.

Abstract: A variable venturi-type carburetor comprising a suction piston which has a tip face defining a venturi portion. The tip face has a needle-mounting face at the center thereof, and a metering needle is fixed onto the needle-mounting face. The tip face also has a projecting tip face portion located upstream of the needle and projecting from the needle-mounting face towards the venturi portion. A groove, extending along the axis of the intake passage of the carburetor, is formed on the projecting tip face portion. The projecting tip face portion has a V-shaped cross-section which expands from the groove towards the venturi portion.

Abstract: A control device comprising a push rod and a wax valve actuating the push rod in response to the temperature of the cooling water of an engine. The push rod is connected to the throttle valve of the carburetor so that the degree of opening of the throttle valve becomes smaller as the temperature of the cooling water of the engine is increased. The amount of air fed into the fuel passage from the air bleed passage is controlled by the push rod so that the amount of the air is increased as the temperature of the cooling water of the engine is increased. A vacuum-operated, time-delay valve is connected between the air-bleed passage and the atmosphere and increases the amount of air fed into the fuel passage from the air-bleed passage following a brief time delay period after the engine starts.

Abstract: A variable venturi-type carburetor comprising a suction piston which has a tip face defining a venturi portion. The tip face has a projecting tip face portion located upstream of the needle and projecting toward the venturi portion. A groove, extending along the axis of the intake passage of the carburetor, is formed on the projecting tip face portion. The projecting tip face portion has a V-shaped cross-section which expands from the groove toward the venturi portion. A projection, having a V-shaped cross-section, is formed on the inner wall of the intake passage, which faces the tip face of the intake passage, which faces the tip face of the suction piston. The projection enters into the V-shaped cross-section of the projecting tip face portion of the suction piston when the amount of air fed into the cylinder of the engine is small.

Abstract: A variable venturi-type carburetor comprising a suction piston, a fuel passage, and a needle fixed onto the suction piston and extending through the fuel passage. An air bleed passage is connected to the fuel passage. During engine starting, before the engine begins to rotate by its own power, the vacuum chamber of the suction piston is open to the atmosphere and the air bleed passage is shut off. When the engine begins to rotate by its own power, the vacuum chamber of the suction piston is closed from the atmosphere. After this, the air bleed passage is gradually opened. Such control of the closing of the vacuum chamber and the opening of the air bleed passage prevents engine stall by preventing the fuel mixture from becoming excessively lean when the engine first begins to rotate on its own power and then prevents engine misfires by subsequently reducing the air-fuel ratio to a lean mixture.

Abstract: A variable venturi carburetor according to this invention is so arranged that during low load operation with a small degree of opening of the throttle valve, the suction piston is moved forward corresponding to a reduced amount of suctioned air to make a width of the venturi portion narrow and maintain negative pressure in the venturi portion at a constant level, fuel suctioned from the float chamber is gauged in an amount thereof under the cooperation of the metering needle with the metering jet and then ejected from the main nozzle, the ejected fuel strikes upon the head of the suction piston due to inertia thereof and then flows down along the surface of the head, the fuel collecting at the lower surface is received in the fuel receiver and flows down through the path formed in the wall of the barrel into the intake manifold in an atomized state, bypassing the throttle valve.

Abstract: A device for adjusting the degree of opening of the throttle valve of a carburetor comprising a cam pivotally mounted on a pivot. The cam is actuated by a wax valve and rotated in accordance with an increase in the temperature of the cooling water of the engine. The cam has a cam face which is engageable with a lever connected to the throttle valve for retaining the throttle valve at a predetermined fast idling degree during engine warm-up. An auxiliary lever is pivotally mounted on the pivot. The auxiliary lever has an outer circumferential face which is engageable with the lever of the throttle valve for retaining the throttle valve at the predetermined fast idling degree after completion of engine warm-up.

Abstract: An ignition system of an internal combustion engine comprising a metallic plate inserted between the cylinder block and the cylinder head. The metallic plate has an opening, upon the inner peripheral wall of which is mounted a plurality of T-shaped electrodes. Each of the T-shaped electrodes comprises an electrode piece and a conductive bar member connected to the electrode piece. The conductive bar member is surrounded by a tubular insulating member. The tubular insulating member is inserted into bores formed in the metallic plate for forming a condensor between the conductive bar member and the metallic plate. The electrode pieces are arranged in series for forming spark gaps between adjacent electrode pieces, and a high voltage is applied across the electrode pieces.

Abstract: A variable venturi-type carburetor comprising a vacuum chamber, connected to a venturi portion of the carburetor, and a suction piston actuated in response to a change in vacuum in the vacuum chamber. A fuel passage is formed in the carburetor and is open to the intake passage of the carburetor. The suction piston has a needle extending through the fuel passage. An air bleed passage is connected to the fuel passage. When the level of vacuum in the intake passage becomes smaller than a predetermined level, the amount of air fed into the fuel passage from the air bleed passage is reduced, and the vacuum chamber is caused to be open to the atmosphere.

Abstract: A time correcting device for a time signalling timepiece including a time striking construction having an hour wheel pipe onto which an hour hand is attachingly pushed and a rotation detector linked to the rotation of the hour wheel pipe to control signalling numbers of a time striking device, an hour wheel inserted onto the hour wheel pipe with clearance, a click disc formed on the either one of the hour wheel pipe or the rotation detector in the time striking construction or said hour wheel, and a click apparatus facing to the click disc and fixed to the either other one of the hour wheel pipe, the rotation detector or the hour wheel, whereby the click action between the click disc and the click apparatus enables the intermittent rotation between the hour wheel pipe and the hour wheel so that the direct time correction on the hour hand can be performed with separation from a minute hand.

Abstract: A variable venturi carburetor in which a biasing spring urges a metering needle to contact the metering jet during low air-intake operating conditions and including an expanded portion formed at the front end of the metering needle which is loosely contained in a large bore portion of a well during low air-intake operating conditions and which engages a small bore portion of the well during high air intake operating conditions to center the metering needle in the metering jet for maintaining bleed sensitivity constant while the amount of bleed air varies.

Abstract: An electronic timepiece with a time striking device including an electric preliminary signalling means, an electric time striking means, an electric contact means, a time striking selecting means, and a time striking timing circuit in which a timer circuit is included, and preventing mishearing of time striking numbers at a right hour due to the preliminary signalling action making a time striking action predicted in advance.

Abstract: Variable venturi type carburetor characterized in that one end of the fuel suction-ejection hole opens in a venturi unit formed in the carburetor body; a throttle is provided midway in the fuel suction-ejection hole; one end of a fuel path, the other end of which opens in the float chamber, opens in the inside wall of the throttle, whereby steam bubbles generated in the fuel of the fuel path can be sucked into said throttle and thus coalescence and growth of steam bubbles in the fuel can be prevented from causing vapor lock.

Abstract: An internal combustion engine having an auxiliary combustion chamber connected to only the main combustion chamber via a connecting passage. The engine comprises a first raised portion formed on the inner wall of the cylinder head, a second raised portion formed on the top face of the piston at a position opposite to the first raised portion with respect to the axis of the piston, and a third raised portion formed on the inner wall of the cylinder head above the second raised portion. A first flat squish area is formed between the flat peripheral top face of the piston and the flat bottom face of the first raised portion. A second spherical shell shape squish area is formed between the spherical bottom wall of the third raised portion and the spherical rear face of the second raised portion. A recessed portion is formed on the top wall of the main combustion chamber at a position near the first raised portion. The open end of the connecting passage is arranged in the recessed portion.

Abstract: A variable venturi carburetor wherein the suction piston is fully closed with respect to the venturi section at engine stop to elevate the negative pressure at the time of cranking, and is opened to a predetermined degree at the time of idling, thereby obtaining stable driving performance at a suitable air-fuel ratio. The suction piston slides, via a spring, into and out from a suction chamber communicating with a mixing chamber via a negative pressure path and has at its head a metering needle to face a metering jet. The low negative pressure occurring in the mixing chamber along with cranking is reliably applied to the gap between the metering needle and the metering jet which is wider than the gap in their matching state at the time of idling. Hence, the engine starts operating with an over-rich air-fuel ratio. The suction piston is shaped in such manner so as to close a venturi section on the upstream side with respect to the base portion of the metering needle at the time of stop of the engine.