Patents Assigned to Mitsuba Electric Mfg. Co., Ltd.
  • Patent number: 5738181
    Abstract: In a press fit arrangement of a tubular nut member in an enlarged end portion of a hollow shaft, typically used in an electric power steering device, a region of loose fit is provided in a part of an interface between the tubular nut member and the enlarged portion, adjacent to an annular shoulder defined at the inner boundary of the enlarged portion. The region of loose fit can be achieved by provided an annular recess in the inner bore of the enlarged portion and/or the outer circumferential surface of the nut member. Thereby, the region of a relatively high rigidity, which is created by the provision of the annular shoulder, is prevented from being involved in the press fit when the nut member is fitted into the inner bore of the enlarged portion until the inner end of the nut member abuts the annular shoulder so that a relatively uniform tight fit can be achieved between the nut member and the enlarged portion over a relatively large axial length.
    Type: Grant
    Filed: October 20, 1995
    Date of Patent: April 14, 1998
    Assignee: Mitsuba Electric Mfg. Co., Ltd.
    Inventor: Jun-ichi Kato
  • Patent number: 5634258
    Abstract: In a method for forming the coils passed through the core slots of a motor rotor so as to keep the coils fully received in the core slots, a motor rotor, in which coils are wound around the core thereof, is received in a metallic mold die which has a die surface spaced from the outer circumferential surface of the core by a certain gap, and resin material is injected from an injection inlet provided in an axial end of the upper metallic mold die. As the resin material is injected into the cavity of the metallic mold die, the resin material first fills the gap, and then flows into the core slots from the outer periphery thereof. The flow and the pressure of the resin material causes the coils to be pushed toward the bottom regions of the core slots, and once the filled resin material is cured, the coils are firmly secured well inside the core slots.
    Type: Grant
    Filed: October 19, 1995
    Date of Patent: June 3, 1997
    Assignee: Mitsuba Electric Mfg. Co., Ltd.
    Inventors: Tsugio Onodera, Yasuhiro Kanai
  • Patent number: 5596138
    Abstract: In an arrangement for testing air-tightness of an electric device having an enclosed housing, and an electric connector fitted into an opening provided in the housing, the electric connector is provided with a communication hole for communicating the interior of the electric device with the exterior, and the communication hole is adapted to close when two halves of the connector are coupled with each other. Thus, the air-tightness of electric device can be conducted when the assembly work is substantially finished whereas the conventional arrangements require an additional assembly work step which could be a potential cause for loss of air tightness. Furthermore, the present invention can be implemented simply by providing a small communication hole in the electric connector and an associated sealing arrangement without requiring any change to the existing device to be tested.
    Type: Grant
    Filed: November 3, 1995
    Date of Patent: January 21, 1997
    Assignee: Mitsuba Electric Mfg. Co., Ltd.
    Inventors: Tsugio Onodera, Shigeru Takei
  • Patent number: 5552652
    Abstract: A flat commutator includes a circular arrangement of sectorial carbon segments made of conductive carbon providing commutating surface of the commutator, metallic segments attached to respective of the carbon segments, and a hub body of synthetic resin. The metallic segments have fixing members encroaching into inner and outer peripheral surfaces of the carbon segments, thereby fixing the carbon segments to the metallic segments. The hub body encloses at least fixed portions of the inner and outer peripheral surfaces of the carbon segments that engage with the fixing members of the metallic segments.
    Type: Grant
    Filed: December 1, 1994
    Date of Patent: September 3, 1996
    Assignees: Mitsuba Electric Mfg. Co., Ltd., Kunimitsu Carbon Industry Co., Ltd.
    Inventors: Shuji Shimoyama, Iwao Yanagizawa
  • Patent number: 5539987
    Abstract: A bracket having an arm extending therefrom is securely attached, at a base end thereof, to a first belt passed around a pair of pulleys, and a second belt is passed around another pair of pulleys and guided along the length of the arm by rollers or the like. A carriage is securely attached to a part of the second belt extending along the length of the arm. Therefore, by moving the first belt, the arm is moved along the length of the first belt or in the X-direction. By moving the second belt while keeping the first belt stationary, the carriage is moved along the length of the arm or in the Y-direction. Thus, the carriage can be moved to an arbitrary point along a desired path in a X-Y coordinate system by individually moving the first and second belts in an appropriate manner.
    Type: Grant
    Filed: June 1, 1995
    Date of Patent: July 30, 1996
    Assignee: Mitsuba Electric Mfg. Co., Ltd.
    Inventor: Mamoru Zennyoji
  • Patent number: 5528945
    Abstract: In an engine starter comprising a one-way clutch provided around a pinion support shaft carrying a pinion in a torque transmitting relationship but in an axially slidable manner, and an annular input gear to transmit torque to a clutch outer member of the one-way clutch, to prevent an eccentricity of the clutch outer member from seriously affecting the coupling structure between the motor and the input gear, the outer circumferential surface of the clutch outer member is provided with an external teeth serration while the input gear 12 is provided with an internal teeth serration so as to form a serration coupling. The serration coupling is provided with a sufficient radially play to accommodate a maximum eccentricity of the clutch outer member. Thus, the engine starter can be made reliable in use without requiring any undue precision during the fabrication process.
    Type: Grant
    Filed: May 31, 1994
    Date of Patent: June 25, 1996
    Assignee: Mitsuba Electric Mfg. Co., Ltd.
    Inventor: Michio Okada
  • Patent number: 5467632
    Abstract: The capability of heat dissipation from the contact surface of a magnetic switch for a starter motor is improved without increasing the fabrication cost. A punch 28 having a plurality of square projections arranged in two mutually perpendicular directions at the pitch of P is applied to the surface of a plate member 27 to form a first group of punched recesses 29a. The pitch P is twice the length of a side of each punched recess 29a. Then, the punch 28 is shifted with respect to the first group of punched recesses 29 by P/2 in both the vertical and horizontal directions before forming a second group of punched recesses 29b. The punched recesses 29a and 29b define projections 26 in the parts which are not occupied by these recesses generally in the pattern of a checker board.
    Type: Grant
    Filed: December 16, 1993
    Date of Patent: November 21, 1995
    Assignee: Mitsuba Electric Mfg. Co., Ltd.
    Inventors: Mitsuhiro Kogure, Shinichi Nagashima, Kazuhisa Wakabayashi, Shigeyuki Enkaku, Hitoshi Shimayama, Minoru Kimura, Shuji Shimoyama, Tsugio Yokoo
  • Patent number: 5369915
    Abstract: An apparatus is presented to automatically handle operations related to grinding simultaneously the two end faces of a core of an armature. The apparatus consists of four main sections: a charging section to charge a core at a time to a transport section; a transport section to transport the core to the grinding section, a grinding section disposed at the lowest region of the transport section to grind the two end faces simultaneously; and a discharging section to discharge the ground core for further processing. The cores are individually housed in the retaining grooves of the transport section with the core axis lying horizontally. The grinding wheels of the grinding section straddles the core, thus enabling the two end faces to be ground at the same time.
    Type: Grant
    Filed: December 14, 1992
    Date of Patent: December 6, 1994
    Assignee: Mitsuba Electric Mfg. Co. Ltd.
    Inventor: Kanji Kanai
  • Patent number: 5353658
    Abstract: In a starter for internal combustion engines, a tubular pinion gear support shaft 8 is rotatably supported by a casing, and coupled to a drive shaft of a motor so as to be rotatively driven by the motor, and an annular pinion gear 3 is fitted on the pinion gear support shaft in axially slidable but rotatively drivable relationship. A push rod 9 is axially slidably received in the tubular pinion gear support shaft and provided with a free end engaged with a free end of the pinion gear for transmitting a shifting force for driving the pinion gear into meshing with a ring gear of an engine from a shift lever to the push rod. A shift spring 15 consisting of a compression coil spring is coaxially received in the pinion gear support shaft and interposed between an associated end of the shift lever and a base end of the push rod. Thus, the assembling of the starter is simplified while the action of the shift spring is stabilized, and the design of the starter is made compact.
    Type: Grant
    Filed: June 10, 1993
    Date of Patent: October 11, 1994
    Assignee: Mitsuba Electric Mfg. Co., Ltd.
    Inventors: Shinichi Nagashima, Hitoshi Ono
  • Patent number: 5335412
    Abstract: A working device for forcing an armature shaft is disclosed. The working device comprises a sub-index and a main index. The sub-index has a first stopping position adjacent to a shaft storage means for storing armature shafts, and a second stopping position adjacent to a knurl-working means for carrying out a knurl-working to the armature shaft. The main index has a core-feed stopping position at which an armature core is fed by an armature core feed means, a shaft-forcing stopping position at which the armature shaft supplied from the sub-index side is forced into the through-hole of the armature core by a shaft-forcing means, and a discharge stopping position from which the armature core with the forced armature shaft is discharged outside of the main index.
    Type: Grant
    Filed: December 10, 1992
    Date of Patent: August 9, 1994
    Assignee: Mitsuba Electric Mfg. Co., Ltd.
    Inventor: Yasushi Kawakami
  • Patent number: 5333351
    Abstract: To allow compact design of a wiper system equipped with a wiping angle varying assembly which comprises an actuating motor, an eccentric cam member provided in a path of transmitting the movement of the output end of a wiper motor to a wiper arm, and a control unit for activating the actuating motor so as to move the eccentric cam member and thereby change the range of angle of the wiping movement by altering a configuration of a linkage structure provided between the wiper motor and the wiper arm, the control unit is adapted to activate the eccentric cam member with such a timing that the force transmitted through the linkage structure from the wiper motor to the wiper arm tends to assist the force produced by the actuating motor to move the eccentric cam member in the required direction. Thus, the requirement of the power output of the actuating motor can be reduced, and the actuating motor can be substantially reduced in size.
    Type: Grant
    Filed: August 6, 1993
    Date of Patent: August 2, 1994
    Assignee: Mitsuba Electric Mfg. Co., Ltd.
    Inventor: Katsutoshi Sato
  • Patent number: 5315752
    Abstract: A method and an apparatus for press fitting characterized in permitting the simultaneous measurement of a press fitting body with the press fitting, and characterized in improving the accuracy of the press fitting.
    Type: Grant
    Filed: January 26, 1993
    Date of Patent: May 31, 1994
    Assignee: Mitsuba Electric Mfg. Co., Ltd.
    Inventors: Masami Ohta, Masami Shimizu, Kazuo Niijima, Yasushi Kawakami
  • Patent number: 5301417
    Abstract: A method and a pressing apparatus for pressing an armature shaft into an axial hole formed on an approximately cylindrical core, so as to protrude the shaft from the specified end face of the core at the specified protrusion dimension. A gage base is provided in which a shaft through hole of the same dimension as the specified protrusion dimension is formed. The core is placed on the gage base with the specified end face facing down. The shaft is first pressed into the axial hole to protrude it downward from a lower face of the shaft through hole. Next, the shaft is pushed back upward until a shaft push back portion reaches the gage base, thereby, protruding the shaft form the specified end face of the core at the specified protrusion dimension.
    Type: Grant
    Filed: November 24, 1992
    Date of Patent: April 12, 1994
    Assignee: Mitsuba Electric Mfg. Co., Ltd.
    Inventor: Yasushi Kawakami
  • Patent number: 5261286
    Abstract: In connecting brackets using a frame member for a wiper device, the frame member being of linear structure providing sufficient mechanical intensity, the brackets are formed of die cast employing a general purpose die referenced to the axes of sleeves for pivotal shafts. An axis A of the frame member is so arranged that it is contained in the third imaginary plane which is parallel with first and second imaginary planes, wherein the first and second imaginary planes are selected respectively from imaginary planes which contain an axis B of a first pivotal shaft and from imaginary planes which contain an axis C of a second pivotal shaft 6, so that the first and second imaginary planes are parallel with each other.
    Type: Grant
    Filed: July 20, 1992
    Date of Patent: November 16, 1993
    Assignee: Mitsuba Electric Mfg. Co., Ltd.
    Inventor: Akira Hayashi
  • Patent number: 5250866
    Abstract: A fixing structure of the present invention is capable of fixing permanent magnets to an internal peripheral surface of a cylindrical yoke in a short time without producing a positional deviation. The fixing structure has magnet receiving pieces which are projected on the internal peripheral surface of an internal cylinder, and magnet holders each having elastically deformable magnet pressure pieces formed therein, so that permanent magnets are respectively held between the elastically deformed magnet pressure pieces and the magnet receiving pieces and pressed against the side of the magnet receiving pieces in a normal direction due to the elastic restoring force on the magnet pressure pieces. The permanent magnets can thus be integrally fixed to the internal peripheral surface of the internal cylinder.
    Type: Grant
    Filed: May 18, 1992
    Date of Patent: October 5, 1993
    Assignee: Mitsuba Electric Mfg. Co., Ltd.
    Inventors: Masashi Fukui, Takayoshi Sakamoto
  • Patent number: 5216307
    Abstract: An electric motor has a motor shaft which is rotatably supported at its base end by a motor yoke and which carries a core member. The motor includes a gear such as a worm gear press-fitted to a free end portion of the motor shaft, a front frame which is secured to a front opening of the motor yoke and which has a substantially cylindrical portion having a shaft hole through which the motor shaft extends and a bearing mounted on the motor shaft at a position between the gear and the core member, the bearing having limited axial movement along the motor shaft.
    Type: Grant
    Filed: March 2, 1991
    Date of Patent: June 1, 1993
    Assignee: Mitsuba Electric Mfg. Co., Ltd.
    Inventor: Yukiteru Hosoya
  • Patent number: 5214440
    Abstract: A motor is controlled so that it is not driven to further extend an antenna, even when a worm wheel receives a load from a drive cord and rotates to retract the antenna when the antenna is extended to its maximum length. The rotatable worm wheel for extending or contracting the drive cord is connected to a cam forming a motor operation controlling mechanism in which electricity is intermittently passed to the motor on the basis of the amount of rotation of the worm wheel. The cam can rotate through an angle of play .THETA. provided in the worm wheel to prevent the motor from being driven and the antenna from being extended further.
    Type: Grant
    Filed: March 6, 1992
    Date of Patent: May 25, 1993
    Assignee: Mitsuba Electric Mfg. Co., Ltd.
    Inventors: Yoshikazu Takahashi, Yukiteru Hosoya, Akio Konuma
  • Patent number: 5214401
    Abstract: An electromagnetic switch suitable for controlling large electric current in starter motors or the likes comprising a rod which is actuated in a longitudinal direction by an electromagnet, a fixed contact member, and a moveable contact member carried by the rod for selective engagement with the fixed contact member by energization and deenergization of the electromagnet. The moveable contact member is allowed to rotate around an axial line perpendicular to the axial line of the rod so that the moveable contact can achieve a favorable contact even when the fixed contact member involves dimensional errors, and that the moveable contact may be easily detached from the fixed contact member even when the two contact members are partly fused together. The rotational movement of the moveable contact member can be achieved by yieldably or elastically holding the moveable contact member between a pair of convex surfaces on the rod.
    Type: Grant
    Filed: March 11, 1992
    Date of Patent: May 25, 1993
    Assignee: Mitsuba Electric Mfg. Co., Ltd.
    Inventors: Eiichi Kimura, Koji Nara
  • Patent number: 5211485
    Abstract: A structure for preventing movement of pivot bearings used in vehicular wiper devices, wherein a pivot shaft is rotatably supported by a sleeve mounted on a vehicle body through the intermediary of a pair of bearings at a predetermined axial spacing from each other. The pivot bearing fixing structure comprises slits formed in facing end surfaces of the bearings so as to divide the end portion of each bearing into an inner circumferential portion and an outer circumferential portion, ridges protruding inward radially from an inner surface of the inner circumferential portion of each bearing, the ridges being notched at a predetermined circumferential spacing so as to be elastically deformable radially outward, and recesses provided on an outer circumferential surface of the pivot shaft so as to receive the ridges thereby to fix the bearings against axial movement.
    Type: Grant
    Filed: July 24, 1992
    Date of Patent: May 18, 1993
    Assignee: Mitsuba Electric Mfg. Co., Ltd.
    Inventor: Takashi Hoshino
  • Patent number: 5211048
    Abstract: Disclosed is a method of forming a shaped configuration by cold forging at an end of a long element, such as the armature shaft of a starter motor for an automobile. The die used in this method has an inner space in which a section for forming the shaped configuration is provided at one end portion thereof, and the diameter of the inner space gradually increases from the shaped configuration forming section to the other end portion of the inner space. A material is placed in the die from the other end portion of the inner space and, then, is forced into the die by a punch to be forged into the shape corresponding to that of the inner space of the die. After the forging, the shaped material is pushed out of the die by a knock-out pin which is inserted into the die in the opposite direction to the direction in which the material is forced.
    Type: Grant
    Filed: April 13, 1992
    Date of Patent: May 18, 1993
    Assignee: Mitsuba Electric Mfg. Co., Ltd.
    Inventors: Katsuo Takahara, Shigeru Okajima, Tugio Onodera