Abstract: A guide pipe is formed from a metal material, and its internal cross section has a circular shape whose diametric dimension gradually becomes smaller with a distance from an ultrasonic sensor. That is, the guide pipe is formed so that a route for transmitting an ultrasonic wave generated from the ultrasonic sensor may be tapered from this ultrasonic sensor toward a reflector plate. Thus, the acoustic pressure level of the ultrasonic wave which enters the reflector plate can be made higher than a value in a prior-art liquid level detecting apparatus. Accordingly, the energy of the ultrasonic wave generated from the ultrasonic sensor can be utilized for liquid level detection at a high efficiency, so that a fuel liquid level detecting apparatus capable of accurate liquid level detection can be provided.

Abstract: A guide pipe is formed from a metal material, and its internal cross section has a circular shape whose diametric dimension gradually becomes smaller with a distance from an ultrasonic sensor. That is, the guide pipe is formed so that a route for transmitting an ultrasonic wave generated from the ultrasonic sensor may be tapered from this ultrasonic sensor toward a reflector plate. Thus, the acoustic pressure level of the ultrasonic wave which enters the reflector plate can be made higher than a value in a prior-art liquid level detecting apparatus. Accordingly, the energy of the ultrasonic wave generated from the ultrasonic sensor can be utilized for liquid level detection at a high efficiency, so that a fuel liquid level detecting apparatus capable of accurate liquid level detection can be provided.

Abstract: A liquid level detecting apparatus has an ultrasonic sensor, a reflector, a first pipe and a second pipe. The reflector reflects an ultrasonic wave from the ultrasonic sensor to a liquid level, and the ultrasonic sensor detects a reflection wave reflected on the liquid level to detect a liquid level position. The first and second pipe surrounds the ultrasonic wave transmission path from the ultrasonic sensor via the reflector to the liquid level. The first pipe and the second pipe are integrally configured and supported on a bottom of a tank to be rotatable about the first pipe.

Abstract: A guide pipe is formed from a metal material, and its internal cross section has a circular shape whose diametric dimension gradually becomes smaller with a distance from an ultrasonic sensor. That is, the guide pipe is formed so that a route for transmitting an ultrasonic wave generated from the ultrasonic sensor may be tapered from this ultrasonic sensor toward a reflector plate. Thus, the acoustic pressure level of the ultrasonic wave which enters the reflector plate can be made higher than a value in a prior-art liquid level detecting apparatus. Accordingly, the energy of the ultrasonic wave generated from the ultrasonic sensor can be utilized for liquid level detection at a high efficiency, so that a fuel liquid level detecting apparatus capable of accurate liquid level detection can be provided.

Abstract: Two pairs of regulating means, that is, the first stopper and the second stopper, which regulate a rotary angle range of the magnet holder when the first stopper and the second stopper come into contact with the stopper of the arm integrally fixed to the magnet holder, are provided in the body which is a fixing member, and the rotary angle range of the magnet holder regulated by one pair of stoppers is made to be different from the rotary angle range of the magnet holder regulated by the other pair of stoppers. Due to the foregoing, when the expensive body is made to be a common part and a plurality of types of inexpensive arms are manufactured the fuel level gauge can be provided, an increase in the manufacturing cost of which is suppressed, which can cope with rotary angle ranges of the plurality of types of arms.

Abstract: A cross-coil type indicating instrument includes a bobbin having an upper center cylinder and a lower center cylinder, a cross-coil unit disposed around the bobbin, a shaft coaxially and rotatably supported by the upper and lower cylinder, a permanent magnet rotor, a dial, a pointer carried by said shaft, and a cup-shaped magnetic shield casing. The upper center cylinder has an upper bearing disposed to be generally flush with the upper surface of the cross coil unit, and the lower center cylinder has a lower bearing and extends through the magnetic shield casing so that the lower bearing is disposed at the back of the magnetic shield casing.

Abstract: A driving unit of a cross-coil type indicating instrument includes a bobbin and a pair of cross-coils crossing each other, a plurality of terminals having an edge portion, a bent portion, and a rod portion. The edge portion is bent at the bent portion to extend toward the cross-coils, and each of the pair of cross coils has a wire end wound around a spool portion formed in the edge portion and soldered thereto. Each of the male terminals has a dam for holding melting solder between the spool portion and the bent portion.

Abstract: An electric connector arrangement for connecting two electric devices comprises a male terminal fixed to a first electric device and extending therefrom toward a second electric device. A circuit board is fixed to the second electric device and has an insertion opening and at least one slit. A female terminal receives the male terminal therein, the female terminal having a body portion adapted to be inserted into the insertion opening and comprising an elastic female contact for receiving the male terminal. At least one deformable connecting element extends away from a top portion of the body portion, each deformable element having a distal end tip extending below the body portion and adaptable to be inserted into one of the slits in the second electric device.

Abstract: A cross-coil type indicating instrument includes a bobbin, a cross-coil unit disposed around the bobbin, a shaft, a permanent magnet rotor disposed inside the bobbin, a dial having a zero position, a pointer carried by the shaft, and a magnetic shield casing for accommodating the bobbin. The magnetic shield casing has a projection member extending from the bottom thereof at a peripheral side of the cross-coil unit to meet one of magnetic poles of the permanent magnet when the pointer returns to the zero-position.

Abstract: A bobbin unit for a cross-coil type meter is composed of an upper bobbin and a lower bobbin. The upper and lower bobbins have an inner cylindrical portion which has a center through hole for receiving a indicator shaft therein. A bearing portion is formed at an edge portion of the center through hole and an oil reservoir portion is formed at a portion in the center through hole adjacent to the bearing portion. The reservoir portion has an inside diameter larger than that of the bearing portion and accommodates a lubricating oil. The reservoir portion is composed of a first annular groove for supplying the lubricating oil to the bearing portion by the capillary action, an oil holding groove and a seal portion having a small gap between the shaft and the inner periphery of the center through hole.