Harada Industry Co., Ltd.

Harada Kogyo Kabushiki Kaisha

Jiro Harada

Shinichi Saito

Masaki Shinkawa

Misao Kimura

Heizo Tsuchida

Hiroyoshi Kojima

A braided wire according to the present invention is constituted by weaving a plurality of first long conductors arranged in parallel and a plurality of second long conductors arranged in parallel so as to cross the first long conductors each other. Each of the first and second long conductors has a section which is perpendicular to an axis thereof and flattened such that a thickness of the conductor is decreased toward both end portions in a width direction. The first and second long conductors each having the flattened section are woven such that they are put one on another in a thickness direction.

Braided wire

A telescopic rod antenna apparatus of the present invention includes a mechanism for extending/retracting a telescopic antenna element by operating a smallest-diameter one of rods of the antenna element, and a means for setting the rods in the second state where a tip portion of a largest-diameter rod contacts an O-shaped ring seal means and then extending the antenna element using the mechanism, setting the rods in the second state where the antenna element is retracted using the mechanism, and displacing the second state to the first state where the largest-diameter rod is returned to the initial position of a holding tube to bring a top portion into contact with the O-shaped ring seal means.

Telescopic rod antenna apparatus

A telescopic rod antenna according to the present invention includes an antenna element and a waterproof ring-shaped seal member which is inserted in a ring-shaped gap in a joint between two rods of the antenna element. The ring-shaped seal member is obtained by shaping a thermoplastic resin film strip, on which at least one projecting portion is formed in its longitudinal direction, like a ring and compressing and inserting a ring-shaped film into the ring-shaped gap. A plurality of ring-shaped contact portions are formed on both sides of the film strip in its longitudinal direction while the projecting portion of the film strip serves as a basic contact portion. The ring-shaped contact portions are adhered to the inner surface of the larger-diameter rod and the outer surface of the smaller-diameter rod at a predetermined pressure. The tip portion of the smallest-diameter rod is provided with a short cylinder member fitted to the outer periphery of the tip portion of the smallest-diameter rod, and a stopper member for sealing an open end of a hollow of the short cylinder member.

Telescopic rod antenna and method for manufacturing the same

A rod-shaped vehicle antenna according to the present invention, includes a rod-shaped antenna element having small- and large-diameter portions arranged alternately at regular pitches along the longitudinal direction of a rod-shaped conductor. When the outside diameter of each of the small-diameter portions is D1, that of each of the large-diameter portions is D2, and the pitch (length of each of the small- and large-diameter portions) is P, P is set within the following range:

Noise reducing rod vehicle antenna

Antenna element

A whip antenna made of a material having high tensile strength, such as stainless steel, including a tapered antenna body and a rounded end, both formed as a single integral unit. The antenna is formed by beating a rod having high tensile strength towards its center and pulling the rod in one direction to form the rod into a tapered shape and forming a rounded top section at the tapered end.

Method for manufacturing whip antenna

A whip antenna for vehicles including an antenna element with a skirt-form coupling member provided on the antenna element. The coupling member is, at a predetermined point on the antenna, prevented from moving toward the lower end of the antenna and has a screw thread on its inner surface. The lower end of the antenna is inserted into an antenna attachment base installed in a vehicle body, and the coupling member is screwed to this antenna attachment base.

Whip antenna for use in vehicles

A coaxial cable is disclosed that employs a plain stitch wire tube formed by braiding a plurality of flattened individual solid metal conductors. The plain stitch wire tube obtained by braiding the flattened conducting wires acts as an external conductor. The coaxial cable may be used, for example, as a feeder cable for an automobile antenna. The coaxial cable thus obtained provides improved shielding against inductive interference and can be manufactured at a lower cost compared with conventional cables.

Coaxial cable

A screw type coupling device includidng a male screw element formed by installing a coil spring form helical component on the outer surface of a columnar element and a female screw element formed by installing a coil spring form helical component in a tubular element so that the two helical components are screw engaged with each other. With the application of such coupling device to an antenna for vehicles, the antenna having the male screw element at the base is removably attached to a vehicle body by screwing the male screw element of the antenna to the female screw element installed in the vehicle body.

Screw type coupling device and an antenna installation device using the

A drive control device for an electrically-driven extending and retracting antenna such as an antenna on an automobile including a motor-driven rotary plate which makes approximately one revolution during the time for complete extension or retraction and has attached, on one side, a disk-shaped conducting part with a small cut-out. Of the three contacts, the first is ordinarily in contact with the disk-shaped conducting part, maintaining a state of electrical continuity, the second contact contacts the small cut-out when extension of the antenna is completed; and the third contact contacts the small cut-out when retraction of the antenna is completed. As a result, electrical continuity is maintained during extension or retraction of the antenna, but not when extension or retraction has been completed. The first and second contacts thus constitute a limit switch for antenna extension; and the first and third contacts constitute a limit switch for antenna retraction. As a result, the extension and retraction operating wire never sustains any unreasonable tensile or compressive forces as would be the case with a step-type drive control, where the drive motor operates for longer periods than required.

Drive control device for an electrically-driven extending and retracting

A multistage extensible rod antenna system including a plurality of conductive rods which have different diameters, respectively, and are connected in a freely slidable manner to each other. Each of the conductive rods is provided, along its inner circumferential wall of the upper end portion, with first and second stepped portions of different diameters. The first and second stepped portions hold a first collar and a second collar, respectively with an elastic sealing ring therebetween. The upper end face of each of the rods is formed into an engaging portion to keep the collar from slipping off. The multistage extensible rod antenna system thus structured creates less compressive force on the elastic sealing ring, prolonging the elasticity of the sealing ring and extending the service life of the multistage extensible rod antenna system.

Multistage extensible rod antenna

Disclosed is a car antenna system which comprises a substantially cylindrical mounting base having a conductor fitted therein and penetrating a car body wall, a mounting member shifted along the mounting base and fixed, a fixing means formed of an insulating material shifted by the mounting member to fix the mounting base to the car body wall, a rod antenna element attached to the outside end of a conductive part of the mounting base, and a loading coil located inside the car body wall and connected between the conductive part and a cable led to a CB-wave transmitter-receiver whereby, the capacitance between the car body wall and the conductive part being lower as compared with a case in which the mounting member is not included.

Car antenna mounting means

A car antenna system comprises an expansion-type antenna element, a driving wire with one end connected to the driving end of the antenna element, a wire transfer mechanism to expand and contract the antenna element by transferring the driving wire in the longitudinal direction thereof, a motor for driving the wire transfer mechanism, a driving power supply circuit including a first power supply circuit for rotating the motor in one direction and a second power supply circuit for rotating the motor in the opposite direction, and first and second circuit breakers connected, respectively, to the first and second power supply circuits for breaking overcurrent flow in each corresponding power supply circuit when the antenna element reaches the expansion or contraction limit.

Growing community of inventors

Tokyo, Japan

Jiro Harada