Patents by Inventor Keiji Hasegawa
Keiji Hasegawa 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).
-
Patent number: 6648996Abstract: The present invention is directed to a method for producing a helical spring which comprises the steps of providing a plurality of parameters for defining a desired configuration of a target helical spring, setting at least bending positions and twisting positions on the basis of the plurality of parameters, and bending and twisting the element wire at the positions set in response to every predetermined feeding amount of the element wire, to produce the target helical spring. The parameters includes number of coils, coil diameter and lead of the target helical spring. At least the bending positions may be adjusted in response to the cycle of alternating diameters between a local maximum diameter and a local minimum diameter of the target helical spring.Type: GrantFiled: October 15, 2001Date of Patent: November 18, 2003Assignee: Chuo Hatsujo Kabushiki KaishaInventor: Keiji Hasegawa
-
Publication number: 20030158620Abstract: The present invention is directed to a method for producing a helical spring by coiling an element wire while feeding the wire, and performing an after-treatment including at least a warm setting process.Type: ApplicationFiled: February 20, 2003Publication date: August 21, 2003Applicant: CHUO HATSUJO KABUSHIKI KAISHAInventors: Keiji Hasegawa, Shinsuke Okura
-
Publication number: 20030116219Abstract: The present invention is directed to method for setting a formed helical compression spring. At the out set, parameters are measured to determine a reaction force axis of a formed helical compression spring. Next, A target reaction force axis of the spring is compared with the reaction force axis determined by the measured parameters to provide an error between the target reaction force axis and the detected reaction force axis. Then, a tilt angle of at least one of the compression plates tilted to an end plane of the spring is provided, in at least one direction on a plane including a coil axis of the spring, on the basis of the error between the target reaction force axis and the detected reaction force axis. Then, at least one of the compression plates is actuated to pressurize the spring, with at least one of the compression plates tilted to the end plane of the spring by the tilt angle.Type: ApplicationFiled: December 18, 2002Publication date: June 26, 2003Inventors: Keiji Hasegawa, Shinsuke Okura
-
Patent number: 6550301Abstract: The present invention is directed to an inclined helical spring having a plurality of coils along an inclined coil axis. Each coil constituting a part or the whole length of the helical compression spring is increased and decreased in diameter along the longitudinal axis of the spring, and forming the longitudinal axis of the spring in a free state thereof to be inclined substantially at a predetermined angle to an axis to be mounted with the spring. For example, one section of each coil having approximately a half of the circumference of each coil, which is divided by a plane including the coil axis, is increased in diameter, whereas the other one section of approximately a half of the circumference of each coil is decreased in diameter. The inclined helical spring may be mounted on a vehicle suspension.Type: GrantFiled: July 27, 2001Date of Patent: April 22, 2003Assignee: Chuo Hatsujo Kabushiki KaishaInventor: Keiji Hasegawa
-
Publication number: 20030053426Abstract: An uplink channel transmission power control method is provided for a CDMA mobile communication system performing one way communication. A base station measures the received level of data transmitted from each mobile terminal at each channel, and generates a transmission power control signal of each uplink traffic channel. The generated transmission power control signals are multiplexed, and the multiplexed common transmission power control signal is transmitted to all mobile terminals by using the common channel shared by the mobile terminals. Each mobile terminal derives the transmission power control signal of the uplink traffic channel used by the terminal, from the received common transmission power control signal, and controls the transmission power of a data packet.Type: ApplicationFiled: October 3, 2002Publication date: March 20, 2003Applicant: Hitachi, Ltd.Inventors: Katsuhiko Tsunehara, Takashi Yano, Nobukazu Doi, Takaki Uta, Keiji Hasegawa
-
Patent number: 6483816Abstract: An uplink channel transmission power control method is provided for a CDMA mobile communication system performing one way communication. A base station measures the received level of data transmitted from each mobile terminal at each channel, and generates a transmission power control signal of each uplink traffic channel. The generated transmission power control signals are multiplexed, and the multiplexed common transmission power control signal is transmitted to all mobile terminals by using the common channel shared by the mobile terminals. Each mobile terminal derives the transmission power control signal of the uplink traffic channel used by the terminal, from the received common transmission power control signal, and controls the transmission power of a data packet.Type: GrantFiled: March 28, 2001Date of Patent: November 19, 2002Assignee: Hitachi, Ltd.Inventors: Katsuhiko Tsunehara, Takashi Yano, Nobukazu Doi, Takaki Uta, Keiji Hasegawa
-
Publication number: 20020046587Abstract: The present invention is directed to a method for producing a helical spring which comprises the steps of providing a plurality of parameters for defining a desired configuration of a target helical spring, setting at least bending positions and twisting positions on the basis of the plurality of parameters, and bending and twisting the element wire at the positions set in response to every predetermined feeding amount of the element wire, to produce the target helical spring. The parameters includes number of coils, coil diameter and lead of the target helical spring. At least the bending positions may be adjusted in response to the cycle of alternating diameters between a local maximum diameter and a local minimum diameter of the target helical spring.Type: ApplicationFiled: October 15, 2001Publication date: April 25, 2002Applicant: Chuo Hatsujo Kabushiki KaishaInventor: Keiji Hasegawa
-
Patent number: 6375174Abstract: The present invention is directed to a curved helical compression spring having a plurality of coils along a curved coil axis. Each coil constituting the helical compression spring is increased and decreased in diameter, and the order of the increased diameter and the decreased diameter of each coil is reversed at a predetermined position on the longitudinal axis of the helical compression spring, so as to provide the curved coil axis, such as the coil axis curved in C-shape. For example, one section of each coil having approximately a half of the circumference of each coil, which is divided by a plane including the coil axis, is increased in diameter, whereas the other one section of approximately a half of the circumference of each coil is decreased in diameter. The curved helical compression spring may be mounted on a vehicle suspension.Type: GrantFiled: January 23, 2001Date of Patent: April 23, 2002Assignee: Chuo Hatsujo Kabushiki KaishaInventors: Keiji Hasegawa, Toshiyuki Imaizumi
-
Publication number: 20020011090Abstract: The present invention is directed to an inclined helical spring having a plurality of coils along an inclined coil axis. Each coil constituting a part or the whole length of the helical compression spring is increased and decreased in diameter along the longitudinal axis of the spring, and forming the longitudinal axis of the spring in a free state thereof to be inclined substantially at a predetermined angle to an axis to be mounted with the spring. For example, one section of each coil having approximately a half of the circumference of each coil, which is divided by a plane including the coil axis, is increased in diameter, whereas the other one section of approximately a half of the circumference of each coil is decreased in diameter. The inclined helical spring may be mounted on a vehicle suspension.Type: ApplicationFiled: July 27, 2001Publication date: January 31, 2002Applicant: CHUO HATSUJO KABUSHIKI KAISHAInventor: Keiji Hasegawa
-
Patent number: 6307844Abstract: An uplink channel transmission power control method is provided for a CDMA mobile communication system performing one way communication. A base station measures the received level of data transmitted from each mobile terminal at each channel, and generates a transmission power control signal of each uplink traffic channel. The generated transmission power control signals are multiplexed, and the multiplexed common transmission power control signal is transmitted to all mobile terminals by using the common channel shared by the mobile terminals. Each mobile terminal derives the transmission power control signal of the uplink traffic channel used by the terminal, from the received common transmission power control signal, and controls the transmission power of a data packet.Type: GrantFiled: December 4, 1997Date of Patent: October 23, 2001Assignee: Hitachi, Ltd.Inventors: Katsuhiko Tsunehara, Takashi Yano, Nobukazu Doi, Takaki Uta, Keiji Hasegawa
-
Publication number: 20010011791Abstract: The present invention is directed to a curved helical compression spring having a plurality of coils along a curved coil axis. Each coil constituting the helical compression spring is increased and decreased in diameter, and the order of the increased diameter and the decreased diameter of each coil is reversed at a predetermined position on the longitudinal axis of the helical compression spring, so as to provide the curved coil axis, such as the coil axis curved in C-shape. For example, one section of each coil having approximately a half of the circumference of each coil, which is divided by a plane including the coil axis, is increased in diameter, whereas the other one section of approximately a half of the circumference of each coil is decreased in diameter. The curved helical compression spring may be mounted on a vehicle suspension.Type: ApplicationFiled: January 23, 2001Publication date: August 9, 2001Inventors: Keiji Hasegawa, Toshiyuki Imaizumi
-
Publication number: 20010012276Abstract: An uplink channel transmission power control method is provided for a CDMA mobile communication system performing one way communication. A base station measures the received level of data transmitted from each mobile terminal at each channel, and generates a transmission power control signal of each uplink traffic channel. The generated transmission power control signals are multiplexed, and the multiplexed common transmission power control signal is transmitted to all mobile terminals by using the common channel shared by the mobile terminals. Each mobile terminal derives the transmission power control signal of the uplink traffic channel used by the terminal, from the received common transmission power control signal, and controls the transmission power of a data packet.Type: ApplicationFiled: March 28, 2001Publication date: August 9, 2001Applicant: Hitachi, Ltd.Inventors: Katsuhiko Tsunehara, Takashi Yano, Nobukazu Doi, Takaki Uta, Keiji Hasegawa
-
Patent number: 6092780Abstract: A low-bed type seismic isolator for a display case, which includes: at least two lines of arcuate X-rails (3) fixed to a lower plate (1) on a foundation and having lower central portions and higher end portions; at least two lines of arcuate Y-rails (4) fixed to a lower surface of an upper plate (2) above the X-rails (3) and having higher central portions and lower end portions in a direction perpendicularly to the X-rails; connection blocks (5) having lower portions clamping the X-rails, upper portions clamping the Y-rails, and a disk spring provided at the central portions thereof; absorbers (8) disposed on the ends of the X-rails and Y-rails and recesses which fixedly accommodates support legs (7) fixed to the lower surface of the upper plate and protruded downwardly from a seismic isolation object.Type: GrantFiled: November 2, 1998Date of Patent: July 25, 2000Assignees: Mitsubishi Steel Mfg. Co., Ltd., Shimizu CorporationInventors: Hiroshi Kurabayashi, Nobuyuki Sone, Akira Matsuda, Daisuke Yaguchi, Toshio Omi, Hidesi Ito, Tomoya Ishida, Kazuhiko Maebayashi, Keiji Hasegawa, Haruhisa Inoue, Toshiyuki Imaki
-
Patent number: 4911787Abstract: A method and apparatus are disclosed for concentrating an alkaline waste liquor containing sulfur compounds, the so-called black liquor, which is discharged from a step of Kraft-cooking wood fibers, in order to recover the cooking chemicals from said waste liquor, characterized in that CO.sub.2 gas and/or a gas containing CO.sub.2 gas is added to said waste liquor as a boiling-point-lowering agent, viscosity-lowering agent and solidification promoter, after a step of oxidizing said waste liquor and in or prior to one or more stages during the step of concentrating said waste liquor. Also disclosed is an apparatus for concentrating an alkaline waste liquor containing substantially no sulfur compounds (i.e.Type: GrantFiled: September 21, 1987Date of Patent: March 27, 1990Assignee: Research Association of Pulp and Paper TechnologyInventors: Akira Shimokura, Keiji Hasegawa, Shuichi Nagato, Kazushige Tanae, Tokiya Yaguchi
-
Patent number: 4459525Abstract: A speed control system for a selection servomotor of an impact printer or the like employs a speed table which represents a series of speed data which are respectively matched with various differences between real and mark positions of a motor shaft. The speed table is stored to be selectively read out when addressed. A difference between real and mark positions of the motor shaft is added to a head address of the speed table, and the sum is used as an initial address for reading data out of the speed table. Thereafter, the speed data are sequentially read out up to the head address in accordance with the rotation of the motor shaft, so that the motor is driven in response to such various data. A plurality of such speed tables are prepared to vary the speed profile in matching relation with a specific initial value of the difference between the real and mark positions of the motor shaft.Type: GrantFiled: February 2, 1983Date of Patent: July 10, 1984Assignee: Ricoh Company, Ltd.Inventor: Keiji Hasegawa
-
Patent number: 4448555Abstract: An impact printing apparatus automatically discriminates the kind of a type element mounted on a reciprocating carriage of the printer and interchangeable with another type element. A print control program is selected in conformity to the specific kind of type element while desired printing is carried out according to the selected program. Each of the interchangeable type elements is provided with a mark or marks or coded data to be detected by a sensor which is located in a predetermined position on a stationary part of the printer. The mark or coded data is sensed while the type element is rotated or while the carriage carrying the type element is moved. A single mark in the form of a slit is formed in a rotary hub of the type element, and the sensor for detecting the mark comprises a light emitting element mounted on the carriage and a light receiving element mounted on the stationary part of the printer which corresponds to the light emitting element.Type: GrantFiled: March 16, 1982Date of Patent: May 15, 1984Assignee: Ricoh Company, Ltd.Inventor: Keiji Hasegawa
-
Patent number: 4193071Abstract: A CRT display screen of a word processor apparatus displays at least one line of characters. The number of characters in the line is variable, and the character size is automatically adjusted so that the lines fill the width of the screen regardless of the number of characters. The number of characters may be selected from several predetermined numbers such as 80, 96, 128 etc. Alternatively, the number of characters may be determined by the right margin position. In the latter case, when the right margin position is leftward of a predetermined character position, such as 80, the characters may be displayed in 80 character line format with blank spaces rightward of the right margin.Type: GrantFiled: October 19, 1977Date of Patent: March 11, 1980Assignee: Ricoh Company, Ltd.Inventors: Keiji Hasegawa, Yoshikuni Tatara