Patents by Inventor Nobuo Fukuma
Nobuo Fukuma has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 4869871Abstract: Soldering material essentially consists of 20-50% of Pb, 0.5-less than 1% of Sb, 0.1-5% of In, and balance of Sn. Such material is suitable to solder electronic parts exposed to temperature variation and mechanical vibration.Type: GrantFiled: March 16, 1989Date of Patent: September 26, 1989Assignees: Toyota Motor Corporation, Taiho Kogyo Co., Ltd.Inventors: Kenichi Kawai, Nobuo Fukuma, Akira Matsui, Kenichiro Futamura, Eizi Asada, Tatsuhiko Fukuoka
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Patent number: 4689864Abstract: A method of making valve sleeves used for controlling the flow of hydraulic fluid in devices, such as power steering units in motorized vehicle, and the product of the utilized method. The method utilizes a grooving male die which forms a groove on an interior surface of a valve sleeve.Type: GrantFiled: March 28, 1986Date of Patent: September 1, 1987Assignee: Toyota Jidosha Kabushiki KaishaInventors: Nobuo Fukuma, Hisayasu Hasegawa, Kimimasa Murayama, Kunio Hayashi, Yoshihiro Tokudome
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Patent number: 4322669Abstract: An apparatus for controlling a DC motor driven screw feed which moves the table of a machine tool into prescribed positions including a plurality of limit switches which detect the position of the table, a rate change control circuit which receives signals from the limit switches and changes the rate of revolution of the DC motor when the table has reached prescribed rate change positions and a current limiting circuit which supplies the DC motor with a prescribed constant current and keeps the output torque of the DC motor at a prescribed level when the table has reached a prescribed dwell position.Type: GrantFiled: July 5, 1979Date of Patent: March 30, 1982Assignees: Toyota Jidosha Kogyo Kabushiki Kaisha, Yaskawa Electric Mfg. Co. Ltd.Inventors: Nobuo Fukuma, Yoshito Kato, Takao Terui
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Patent number: 4201935Abstract: An improved feed for a D.C. motor driven feed including a feed screw and nut which moves the table of a machine tool through predetermined positions in accordance with orders to change the rate of feed. The improved feed includes a power damping circuit, a switching circuit for electrically coupling the power damping circuit for a predetermined length of time to the D.C. motor whenever there is an order to change the rate of feed, thrust bearings provided in the D.C. motor whereby loads applied to the table are borne by the thrust bears and a cylindrical protective cover coupled to the nut and covering the feed screw such that the bottom inside surface of the cover is in relative near proximity to the feed screw and the top inside surface of the cover is in relative far proximity to the feed screw.Type: GrantFiled: January 17, 1977Date of Patent: May 6, 1980Assignee: Toyota Jidosha Kogyo Kabushiki KaishaInventors: Nobuo Fukuma, Yoshito Kato
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Patent number: 4157668Abstract: A friction speed change gearing of the type comprising a plurality of planetary cylindrical rollers which make a planetary movement along an annular space defined by inner and outer races and a spider member engaged among the rollers in a sliding contact therewith, wherein flexible bearing shoes are provided in the spider member for improving the lubricating oil film maintained between the engaging surfaces of the roller and the spider member.Type: GrantFiled: January 5, 1977Date of Patent: June 12, 1979Assignee: Toyota Jidosha Kogyo Kabushiki KaishaInventors: Nobuo Fukuma, Yoshito Katou
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Patent number: 4151450Abstract: A protective means for a feeder of machinery having means for transmitting control signal formed from the differential between a predetermined revolution speed and an actual revolution speed of a DC-motor for driving the feeder, and a means to control current in the DC-motor according to said control signal, thereby protecting the motor against excessive current.Type: GrantFiled: July 28, 1977Date of Patent: April 24, 1979Assignee: Toyota Jidosha Kogyo Kabushiki KaishaInventors: Nobuo Fukuma, Yoshito Kato, Kouji Nogami
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Patent number: 4147965Abstract: A directional switching device for a feeder in a machine tool driven by a direct current motor. The armature circuit of the direct current motor is provided with a relay contact circuit for switching the forward and backward movements of the conveyor. The relay contact circuit is controlled by signals from a sequencing circuit.Type: GrantFiled: September 22, 1977Date of Patent: April 3, 1979Assignee: Toyota Jidosha Kogyo Kabushiki KaishaInventors: Nobuo Fukuma, Yoshito Kato, Kouji Nogami
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Patent number: 4121331Abstract: A method of manufacturing a friction speed change gearing of the type which comprises a housing, inner and outer races, a plurality of cylindrical planetary rollers mounted between the inner and outer races subject to elastic deformation, and a spider member engaging the planetary rollers, wherein the method is characterized by forming a first assembly including the inner race and the planetary rollers and a second assembly including the housing and the outer race, forming a temperature differential between the two assemblies, inserting the first assembly into the outer race in the second assembly and removing the temperature differentiation so that the rollers are uniformly compressed due to a thermal deformation which occurs when the temperature differentiation has been removed.Type: GrantFiled: January 19, 1977Date of Patent: October 24, 1978Assignee: Toyota Jidosha Kogyo Kabushiki KaishaInventors: Nobuo Fukuma, Yoshito Katou
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Patent number: 4045920Abstract: In the cam-controlled "sizematic" type grinding method and apparatus therefor, a novel "in process" "gagematic" type measuring means has been introduced so as to maintain the strong points of the former and develop a new grinding method and apparatus capable of securing high precision and fine surface finish of workpieces at the same time. For attaining the above purpose (a) a novel process of comparing the timing of signals of reaching the target final dimension and lapsing of the minimum required "spark-out" grind time and (b) a compensation process for wear of the dresser point are introduced.Type: GrantFiled: November 23, 1976Date of Patent: September 6, 1977Assignee: Toyota Jidosha Kogyo Kabushiki KaishaInventors: Nobuo Fukuma, Hideyuki Matsubara
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Patent number: 4015372Abstract: In the cam-controlled "sizematic" type grinding method and apparatus therefor, a novel "in process" "gagematic" type measuring means has been introduced so as to maintain the strong points of the former and develop a new grinding method and apparatus capable of securing high precision and fine surface finish of workpieces at the same time. For attaining the above purpose (a) a novel process of comparing the timing of signals of reaching the target final dimension and lapsing of the minimum required "sparkout" grind time and (b) a compensation process for wear of the dresser point are introduced.Type: GrantFiled: February 6, 1976Date of Patent: April 5, 1977Assignee: Toyota Jidosha Kogyo Kabushiki KaishaInventors: Nobuo Fukuma, Hideyuki Matsubara
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Patent number: 3946212Abstract: An automatic quality control system for a machine which measures workpieces processed by the machine. An estimated value to be obtained from an unprocessed workpiece depending upon information obtained from previously processed workpieces is calculated and is compared with a predetermined control limit. An instruction signal is generated when the estimated value is beyond the control limit to indicate a need for adjustment of the machine.Type: GrantFiled: June 18, 1974Date of Patent: March 23, 1976Assignees: Toyota Jidosha Kokyo Kabushiki Kaisha, Toyota Jidosha Kokyo Rabushiki KaishaInventors: Hisaji Nakao, Nobuo Fukuma, Hideyuki Matsubara, Tadahiro Takasu, Takao Yoneda