Patents by Inventor Akira Tohkairin
Akira Tohkairin 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: 4829206Abstract: An armature for an electric rotary machine, comprising a laminated iron core including a plurality of slots, and teeth, alternately disposed in the cylindrical surface of the iron core, windings placed in said slots, and anchors for preventing the windings placed in the slots from being displaced, wherein the anchors are formed by deforming the end portions of the teeth, while forming before mounting the windings into the slots, a through hole extending through the end portion of each tooth.Type: GrantFiled: February 17, 1987Date of Patent: May 9, 1989Assignee: Hitachi, Ltd.Inventors: Teruhisa Honshima, Yasuaki Watanabe, Akira Takahachi, Tadayochi Samata, Akira Tohkairin, Nobuhiko Ogasawara
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Patent number: 4644850Abstract: A fluid machine comprises a cylinder block mounted on a rotary shaft, a rotary plate an axis of which is intersecting with an axis of the rotary shaft by an acute angle, a gear engaging mechanism for engaging the rotary plate with the rotary shaft to cyclically rotate the same, a piston supported by the rotary plate and inserted into a throughhole provided in the cylinder block a suction system and a delivery system for effecting suction and delivery operation by a rotation of the cylinder block and the piston, a spherical contact portion disposed between the rotary plate and the rotary shaft and adapted to receive thrust generated between the same, and a passage for leading to the spherical contact portion a high-pressure working gas including lubricating oil generated in the delivery system.Type: GrantFiled: December 30, 1985Date of Patent: February 24, 1987Assignee: Hitachi, Ltd.Inventors: Hisanobu Kanamaru, Kazushi Sasaya, Tomiyasu Onuma, Akira Tohkairin
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Patent number: 4541315Abstract: An inside chuck device for machine tools, adapted to chuck a cylindrical work having an axial bore at the peripheral surface of the bore of the work. The chuck device has a chuck having a guide portion adapted to be received by the axial bore of the work so as to guide and center the latter, and a plurality of radial projections. Each of the projections has such a height that the circle contacting the outer side of the projections has a diameter at least 0.02 mm greater than the inside diameter of the work.Type: GrantFiled: April 16, 1984Date of Patent: September 17, 1985Assignees: Hitachi, Ltd., Kawamura Co., Ltd.Inventors: Hisanobu Kanamaru, Akira Tohkairin, Takuzo Kurosawa
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Patent number: 4392296Abstract: In a method of joining two metal members by forming an annular groove at least on one of the two metal members to be joined and causing part of the material of the metal member to flow into the annular groove by plastic deformation to form a joint, at least one annular angled member is formed in the annular groove. The annular angled member extending the entire periphery of the annular groove is substantially triangular in axial cross-sectional shape. The joint has increased strength and can be formed with reduced pressure.Type: GrantFiled: October 3, 1980Date of Patent: July 12, 1983Assignee: Hitachi, Ltd.Inventors: Hisanobu Kanamaru, Akira Tohkairin, Hideo Tatsumi, Naotatsu Asahi, Mitsuo Haginoya
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Patent number: 4377762Abstract: A rotary electric machine rotor comprises a rotary shaft which is formed with a plurality of protuberances projecting beyond a basic circle and extending in a lengthwise direction, and a core which is made of a plurality of core segments smaller in deformation resistance than that of the rotary shaft. The rotary shaft is plastically pressed into the core and has an annular groove formed at a position of the rotary shaft somewhat inward of an end face of the core. The core is plastically deformed and a part of the core is filled fully in the annular groove while axially pressing the core.Type: GrantFiled: January 7, 1981Date of Patent: March 22, 1983Assignee: Hitachi, Ltd.Inventors: Hideo Tatsumi, Hisanobu Kanamaru, Akira Tohkairin, Moisei Okabe, Ryoji Kasama
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Patent number: 4376333Abstract: A joining structure comprises a shaft made of metal and a disc of metal more reducible than the shaft. The shaft has arcuate walls defined by a basic circle, and a plurality of projections each projecting from the basic circle and extending along the axis of the basic circle. The projections are spaced from each other so that the arcuate walls are disposed all between the projections. The disc has a hole of the same diameter as the basic circle. The shaft is forcedly inserted into the hole of the disc so that the projections cut into the disc to be rigidly joined to the disc with high concentricity between the shaft and the hole.Type: GrantFiled: June 15, 1979Date of Patent: March 15, 1983Assignee: Hitachi, Ltd.Inventors: Hisanobu Kanamaru, Moisei Okabe, Akira Tohkairin, Hideo Tatsumi
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Patent number: 4370793Abstract: A method and apparatus for coupling two metallic members such as a shaft and a disc. The method includes forming an annular groove on a joint face or outer circumference of the metallic member having greater deformation resistance of the two members, for example, forming uneven portions on the bottom of the groove by knurling or the like. Working the other metallic member, for example, the disc; having smaller deformation resistance near its joint face so that the joint face opposing that of the other causes plastic deformation. Causing a part of the disc to fluidize and flow into the groove, thereby coupling both metallic members together.Type: GrantFiled: January 3, 1980Date of Patent: February 1, 1983Assignee: Hitachi, Ltd.Inventors: Hisanobu Kanamaru, Moisei Okabe, Hideo Tatsumi, Akira Tohkairin
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Patent number: 4339873Abstract: A rotor of a rotary machine, having a core member consisting of a plurality of hollow pieces, and a rotary shaft which is inserted and secured in a hollow portion of said core member, wherein annular grooves having ruggid bottom are formed in said rotary shaft at positions slightly inside the end surfaces of said core member, and portions of said core member are inserted in said grooves so that said rotary shaft and said core member are fastened together.Type: GrantFiled: February 27, 1980Date of Patent: July 20, 1982Assignee: Hitachi, Ltd.Inventors: Hisanobu Kanamaru, Moisei Okabe, Hideo Tatsumi, Akira Tohkairin, Ryoji Kasama
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Patent number: 4335496Abstract: A coupling process of two metallic members in which a first member to-be-coupled and a second member to-be-coupled are coupled by non-elastically deforming a coupling member. The steps comprise forming a concave portion having an inclined plane on a coupling face of each member to-be-coupled, arranging the members to-be-coupled to make a space therebetween, interposing the coupling member in the space, and applying pressure on the coupling member by using a metal mould to satisfy the following extent:0.ltoreq.S.ltoreq.b3/4bwherein S is the length of rubbing surface of the members to-be-coupled with the coupling member, and b is the distance between the first and second members to-be-coupled.Type: GrantFiled: October 22, 1979Date of Patent: June 22, 1982Assignee: Hitachi, Ltd.Inventors: Hisanobu Kanamaru, Akira Tohkairin, Hideo Tatsumi, Moisei Okabe
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Patent number: 4325678Abstract: A hydraulic pressure producing system including clutch means located between an output shaft of a motor and a rotary pump arranged in a liquid and operated from outside. The rotary pump is driven only when the clutch means is engaged to obtain a discharge pressure.Type: GrantFiled: December 12, 1979Date of Patent: April 20, 1982Assignees: Hitachi, Ltd., Kawamura Co., Ltd.Inventors: Hisanobu Kanamaru, Moisei Okabe, Akira Tohkairin, Hideo Tatsumi, Takuzo Kurosawa
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Patent number: 4290295Abstract: A V-grooved pulley assembly having thick wall portion and thin wall portion therein designed for use with electromagnetic type clutches for driving air conditioning compressors on automobiles and the like wherein the component parts thereof are fabricated by cold workings so as to result in a reduction of the cost of materials and labor.Type: GrantFiled: August 22, 1979Date of Patent: September 22, 1981Assignee: Hitachi, Ltd.Inventors: Hisanobu Kanamaru, Hideo Tatsumi, Akira Tohkairin, Kosaku Sayo
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Patent number: 4253323Abstract: A method is provided for the formation of high precision metal slugs by cold forming. A metal column starting material is subjected to a preforming step in which the starting material is cold forged with a pair of upper and lower metal dies provided with concave recesses to produce a primary product having a barrel shape having a high degree of parallelism on the ends. The resultant primary product is subjected to an upsetting step in which the barrel shape is crushed while maintaining parallelism to obtain a secondary product. The resultant secondary product is then subjected to an ironing step in which the outer diameter of the secondary product is reduced to obtain a high precision slug having an outer diameter which is substantially the same as the outer diameter of the desired final product for which the slug will be utilized.Type: GrantFiled: March 26, 1979Date of Patent: March 3, 1981Assignees: Aida Engineering, Ltd., Hitachi, Ltd.Inventors: Kinshiro Murakami, Atsumu Hakoyama, Masakazu Yamazaki, Hisanobu Kanamaru, Yasushi Ouchi, Akira Tohkairin
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Patent number: 4249298Abstract: A method for connecting two members to be connected comprises following steps. At first, a circumferential groove is formed on the connecting surfaces of the members to be connected. Secondly, axial recesses are formed on the inner surface of the groove. Thirdly, a connecting member is placed between the members to be connected. The connecting member is made of a material which has a smaller resistance against deformation than the members to be connected has and which has a required mechanical strength. Lastly, the connecting member is pressed and plastically deformed, resulting in that the connecting member flows into the groove and the recesses.Type: GrantFiled: March 27, 1979Date of Patent: February 10, 1981Assignee: Hitachi, Ltd.Inventors: Hisanobu Kanamaru, Hideo Tatsumi, Moisei Okabe, Akira Tohkairin