Patents Assigned to Nihon Radiator Co., Ltd.
  • Patent number: 4911262
    Abstract: A muffler includes a first expansion chamber, a second expansion chamber, a resonator chamber and an inlet pipe having a first open end and a second open end. The first open end of the inlet pipe is inserted into the first expansion chamber so as to communicate with the first expansion chamber. A resonator pipe runs substantially in coaxial relationship with the inlet pipe so as to establish communication between the first expansion chamber and the resonant chamber. A return pipe is disposed between the resonator chamber and the second expansion chamber and passes through the first expansion chamber for establishing communication between the first expansion chamber and the second expansion chamber. An outlet pipe communicates with the second expansion chamber. Said return pipe is inserted with the open end into said resonator chamber, while the inserted open end of the return pipe is furnished with a plug. A portion of the return pipe passes through the first expansion chamber.
    Type: Grant
    Filed: November 19, 1987
    Date of Patent: March 27, 1990
    Assignee: Nihon Radiator Co., Ltd.
    Inventors: Katsushige Tani, Toyoki Kawashima
  • Patent number: 4901907
    Abstract: A method for production of a heat exchanger is disclosed, where a powder flux is applied in a process of soldering a heat exchanger core of aluminum. An annular groove is formed in a seat plate. Measures are taken for preventing wetting of the annular groove of the seat plate when sprayed with the water on the preassembled core, such that a non-corrosive flux would not adhere to the annular groove of the seat plate. Water is sprayed in the form of a mist on a preassembled heat exchanger core through plurality of spray nozzles. The annular grooves of the seat plates are thoroughly dried after the application of water for attaining a perfect absence of residual non-corrosive flux in the annular grooves of the seat plates. A non-corrosive flux powder is sprayed onto the preassembled heat exchanger core of aluminum with a powder spray gun. The non-corrosive flux is caused to adhere fast to the portion wetted with the water.
    Type: Grant
    Filed: February 23, 1988
    Date of Patent: February 20, 1990
    Assignees: Nihon Radiator Co. Ltd., Pacific Machinery and Engineering Co. Ltd.
    Inventors: Hiroaki Enokido, Takayuki Hatanaka, Takashi Kozono
  • Patent number: 4878001
    Abstract: The present invention relates to a drive control device for a motor actuator for use with an automobile air conditioner.The drive control device for a motor actuator is formed by using a transistor, and the supply of current from a power source to a motor constituting the drive unit of the motor actuator is carried out by the switching operation of a single transistor.A safety circuit is added to the control switches for applying a signal to the control device for the motor actuator, the safety circuit operates to always make the air condition in the compartment to be set required air conditioning mode.
    Type: Grant
    Filed: March 28, 1988
    Date of Patent: October 31, 1989
    Assignee: Nihon Radiator Co., Ltd.
    Inventors: Hirofumi Hagikura, Haruki Kawamoto
  • Patent number: 4870828
    Abstract: Herein disclosed is a cooling system for use with an internal combustion engine which is operated on evaporable fuel supplied from a fuel tank. The cooling system comprises a tube extending from the fuel tank to a venturi throat portion of an air induction passage of the engine, an expansion valve connected to the tube and opening the tube when a pressure in the tube downstream of the valve is reduced to a certain degree, an evaporator device connected to the tube at a position downstream of the expansion valve, and a structure for defining an enclosed space about the evaporator device.
    Type: Grant
    Filed: February 16, 1988
    Date of Patent: October 3, 1989
    Assignee: Nihon Radiator Co., Ltd.
    Inventor: Yoshiaki Hidaka
  • Patent number: 4871894
    Abstract: A method for producing a piston rod for securing a ball to each end of a rod through projection welding which comprises detachably retaining the ball to be secured in a ball holder for presenting the proximate rod end to the ball; the ball holder being constructed of electrically conductive material to provide a first electrode, with the rod holder being constructed of electrically conductive metal to provide a second electrode. The ball holder and rod holder are adapted for relative travel toward each other to effect a mutual zone of ball and rod contact. Electric current is then passed through the first and second electrodes for projection welding of the ball and rod through the zone of contact while the same are in an inert gas atmosphere. Then the now welded contact is cooled; and thereafter a second electric current is passed therethrough to temper the weld.
    Type: Grant
    Filed: August 14, 1987
    Date of Patent: October 3, 1989
    Assignee: Nihon Radiator Co., Ltd.
    Inventors: Masaomi Suzuki, Hiroyasu Koizumi
  • Patent number: 4867648
    Abstract: A wobble plate type compressor is equipped with a device which can be selectively activated in a manner to induce the wobble plate to assume a position wherein the displacement of the compressor is reduced to zero and thus obviate the need for a clutch for such purposes. The device further includes an arrangement which biases the wobble plate toward a position wherein a positive displacement of the compressor will occur when in a non-activated state. The strength of this bias is insufficient to interfere with the control of the wobble plate inclination by the pressure prevailing in the chamber in which the plate is disposed.
    Type: Grant
    Filed: January 20, 1988
    Date of Patent: September 19, 1989
    Assignee: Nihon Radiator Co., Ltd.
    Inventor: Koji Murayama
  • Patent number: 4865249
    Abstract: A safety device for an engine cooling system having a heater core circuit for circulating the engine cooling water through the heater core of an automotive air conditioning system, and a radiator circuit for circulating the engine cooling water through a radiator. The safety device comprises a safety valve provided in the heater core circuit and capable of discharging the engine cooling water outside the vehicle when the temperature of the engine cooling water exceeds a predetermined temperature and/or when the pressure of the engine cooling water exceeds a predetermined pressure.
    Type: Grant
    Filed: August 28, 1987
    Date of Patent: September 12, 1989
    Assignee: Nihon Radiator Co., Ltd.
    Inventors: Mitsutoshi Sugano, Toshiya Uchida, Shigeru Tokita, Atsuhiko Kaneaki, Shigeho Shimada
  • Patent number: 4860549
    Abstract: The discharge of a variable displacement wobble plate compressor is varied by selectively controlling the pressure prevailing in the crankcase of the device. The duty cycle of a signal controlling the pressure is determined in accordance with the ambient air temperature, the temperature required in the cabin and pressure prevailing in the evaporator.
    Type: Grant
    Filed: December 16, 1987
    Date of Patent: August 29, 1989
    Assignee: Nihon Radiator Co., Ltd.
    Inventor: Koji Murayama
  • Patent number: 4833882
    Abstract: An exhaust manifold for a multicylinder type internal combustion engine has a connector is employed for connecting downstream ends of gas conduits to upstream ends of a forked exhaust pipe. The connector is of a monolithic casting and comprises a base plate portion having openings respectively connected to the upstream ends of the forked exhaust pipe, two collar portions intergrally formed on the base plate portion and having respective bores merged with the openings of the base plate portion respectively. The downstream ends of the gas conduits are sealingly received in the collar portions. A sensor mount is integrally formed on the connector for mounting a gas sensor. The sensor mount has a bore which is exposed to the interior of both the two collar portions.
    Type: Grant
    Filed: October 16, 1987
    Date of Patent: May 30, 1989
    Assignees: Nissan Motor Co., Ltd., Nihon Radiator Co., Ltd.
    Inventors: Makoto Yasuda, Hiroshi Shimamura
  • Patent number: 4829208
    Abstract: A flat motor device in which resin is molded around a knurling portion to thereby form a rotor hub, the rotor hub being projected outwardly of a casing, a shaft projected from the rotor hub is formed with a small diameter threaded portion so as to create an offset portion in a shaft body portion, and a fan is directly mounted on the end surface of the rotor hub, the offset portion is formed in the shaft being utilized to easily manufacture, a flat motor.
    Type: Grant
    Filed: October 23, 1987
    Date of Patent: May 9, 1989
    Assignee: Nihon Radiator Co., Ltd.
    Inventor: Setsuya Uchino
  • Patent number: 4820132
    Abstract: A non-rotatary wobble plate is mounted on a plate which is pivotally mounted on a drive shaft in a manner that the orientation of the wobble plate and the driven plate can be varied. A thrust bearing is provided to accommodate the relative movement between the two plates and a spring, in the form of a plate spring, is provided to constantly bias the wobble plate against the thrust bearing so that noise and the like are not generated during high speed rotation of the driven plate.
    Type: Grant
    Filed: September 16, 1987
    Date of Patent: April 11, 1989
    Assignee: Nihon Radiator Co., Ltd.
    Inventors: Shinichiro Higashihara, Terukazu Shinto
  • Patent number: 4809518
    Abstract: A cylindrical expansion valve is mounted in a tank portion of a laminate type evaporator formed by alternately laminating flat sheet tubes and heat transfer fins. With this arrangement, the structure of the evaporator is made compact as a whole, and a conventional piping work for connecting the evaporator body with a thermo-sensing cylinder is eliminated, thereby rendering the assembling operation easy.
    Type: Grant
    Filed: September 23, 1987
    Date of Patent: March 7, 1989
    Assignee: Nihon Radiator Co., Ltd.
    Inventor: Kouji Murayama
  • Patent number: 4796694
    Abstract: In order to increase the heat exchange capacity and efficiency of a cooling fin for an automotive radiator, air conditioner heat exchanger, or the like, a plurality of small triangular or similar shaped projections which produce a texture similar to that of a vegetable grater, are arranged to project into the flow of a fluid medium which passes over the fin in a manner to split a part of the flow into spiralling flow patterns which curl along the surface of fin downstream of the projections and transfer heat from said surface to the fluid medium or vice versa.
    Type: Grant
    Filed: June 2, 1986
    Date of Patent: January 10, 1989
    Assignee: Nihon Radiator Co., Ltd.
    Inventors: Shiro Ikuta, Eizo Suyama, Masaru Yokoyama, Takeshi Yoshimura
  • Patent number: 4785287
    Abstract: An instrument for detecting the condition of an oil is provided in which an ultrasonic wave having a predetermined waveform is propagated through the oil and assumes a change in waveform in accordance with the particular condition of the oil. The instrument includes an arrangement in which any change in the waveform of the propagated ultrasonic wave is translated into a change in terms of time involving the waveform, which is used for the detection of the particular condition of the oil.
    Type: Grant
    Filed: December 18, 1987
    Date of Patent: November 15, 1988
    Assignee: Nihon Radiator Co., Ltd.
    Inventors: Masahiro Honma, Tadashi Nagai
  • Patent number: 4781320
    Abstract: A method for the production of a heat exchanger having a core part thereof formed by joining a tube of aluminum material and heat-transfer fins of aluminum material with a brazing material, which method is characterized by effecting said brazing by the use of a flux obtained by suspending a potassium fluoroaluminate complex in an aqueous solution of a pigment-forming water-soluble compound.
    Type: Grant
    Filed: April 27, 1987
    Date of Patent: November 1, 1988
    Assignee: Nihon Radiator Co., Ltd.
    Inventor: Tatsuya Fujiyoshi
  • Patent number: 4768677
    Abstract: The invention relates to a fuel tank cap comprising a body, the upper portion of which is provided with a hole. Said hole exhibits a plurality of concave or convex sections which are formed along the inner periphery of the hole. A cover comprises a sleeve, which is formed on the inner periphery of the cover for insertion into the hole of the body, and has a plurality of axial slits. The sleeve is provided with a plurality of convex or concave sections formed along its outer periphery so as to mate with the concave or convex sections of the hole, respectively. When a clamping torque applied on the cap exceeds a predetermined value, an idle-rotation mechanism is established between the sleeve and the hole. The fuel tank cap and, more particularly, such a type of cap can effectively prevent the leakage of fuel in a vehicle fuel tank when the vehicle collides with another vehicle or object.
    Type: Grant
    Filed: October 21, 1987
    Date of Patent: September 6, 1988
    Assignee: Nihon Radiator Co., Ltd
    Inventor: Akira Kitsukawa
  • Patent number: 4765148
    Abstract: A cooling system which uses a jet or ejector pump in place of a mechanically driven compressor includes a working fluid composed of two or possibly more different refrigerants. One has a low saturation temperature while the other has a higher one. The mixture of the two refrigerants is subject to a distillation or separation. Following the separation the low saturation temperature refrigerant (vapor) is condensed in an auxiliary condenser and inducted through the evaporator while the higher saturation temperature refrigerant (liquid) is returned to a boiler for vaporization and subsequent used in the jet pump which produces the pressure reduction via which the low saturation temperature refrigerant is inducted into the evaporator.
    Type: Grant
    Filed: October 21, 1987
    Date of Patent: August 23, 1988
    Assignee: Nihon Radiator Co., Ltd.
    Inventor: Kotaro Ohashi
  • Patent number: 4723597
    Abstract: A heat exchanger core having a tube of aluminum material and heat transfer fins of aluminum material joined to each other with a brazing filler, which has at least part of the surface thereof coated with an inorganic sintered layer incorporating therein a pigment-containing phase of the two complexes of potassium hexafluoroaluminate and potassium tetrafluoroaluminate.
    Type: Grant
    Filed: August 13, 1985
    Date of Patent: February 9, 1988
    Assignee: Nihon Radiator Co., Ltd.
    Inventor: Noriaki Sonoda
  • Patent number: 4708598
    Abstract: A rotary vane-type gas compressor for use in car coolers and the like has a plurality of intake ports for each compression working chamber located at positions shifted from one another in the revolving direction of a rotor. At least one intake port which is located at the most forward position in the revolving direction of the rotor has a throttle valve which is controlled in response to the flow rate of suctioned gas, and the opening degree of the throttle valve is changed as the revolution speed of the rotor increases and creates a higher flow rate of suctioned gas. This reduces the effective compression working chamber volume, i.e., the volume which results when one vane has passed the position of the corresponding intake port to enclose gas in the compression working chamber. By such a construction, it is possible to restrain a substantial increase in both the amount of compressed gas to be discharged and the air-cooling capacity, even when the revolution speed of the rotor increases above 2000 rpm.
    Type: Grant
    Filed: July 13, 1984
    Date of Patent: November 24, 1987
    Assignees: Seiko Seiki Kabushiki Kaisha, Nihon Radiator Co., Ltd.
    Inventors: Terumitsu Sugita, Hideo Shinozuka, Koji Murayama
  • Patent number: D308407
    Type: Grant
    Filed: January 15, 1988
    Date of Patent: June 5, 1990
    Assignee: Nihon Radiator Co., Ltd.
    Inventor: Yoshikazu Takamatsu