Patents Examined by J. D. Miller
  • Patent number: 4510406
    Abstract: A starting device comprises a cylindrical driving shaft, a rotary output shaft placed contiguous to one end of said driving shaft and extending in alignment therewith, a speed reduction unit for reducing revolution of said driving shaft to transmit power from said driving shaft to said rotary output shaft, and a power transmitting shaft which is firmly connected in alignment with said rotary output shaft and is passed coaxially through said driving shaft so as to be rotatable therein, one end of said power transmitting shaft extending from the other end of said driving shaft.
    Type: Grant
    Filed: January 26, 1984
    Date of Patent: April 9, 1985
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Akira Morishita
  • Patent number: 4501987
    Abstract: A surface acoustic wave transducer has a multilayered substrate which is made of a nonpiezoelectric plate which has a surface which is coated with a piezoelectric film, and has an interdigital electrode which is disposed on or under the surface of the piezoelectric film. The interdigital electrode has a split structure and the phase velocity of the surface acoustic wave of the piezoelectric film is smaller than that of the nonpiezoelectric plate.
    Type: Grant
    Filed: December 3, 1981
    Date of Patent: February 26, 1985
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tsuneo Mitsuyu, Shusuke Ono, Ritsuo Inaba, Kiyotaka Wasa
  • Patent number: 4500807
    Abstract: Disclosed is a surface acoustic wave transmission device comprising a piezoelectric substrate provided thereon with an input and output transducers for transmitting and receiving the surface acoustic wave, a package for accommodating the piezoelectric substrate, and an adhesion layer for fixing the bottom of the piezoelectric substrate to the ground plane of the package. The adhesion layer is made to have a thickness of .lambda..sub.R /2.6 or more wherein .lambda..sub.R : is the wave length of the surface acoustic wave at the main lobe of the operating frequency, so that unnecessary waves caused by bulk wave components are absorbed.
    Type: Grant
    Filed: January 3, 1983
    Date of Patent: February 19, 1985
    Assignee: Hitachi, Ltd.
    Inventors: Akitsuna Yuhara, Norio Hosaka, Yuji Fujita, Kiyoharu Kishimoto, Jun Yamada
  • Patent number: 4499393
    Abstract: A surface acoustic wave (SAW) device configured to operate as a spectrum analyzer, and having an array of input transducers disposed on a substrate in such positions as to produce a focused beam of acoustic energy at a focal arc, each position on the arc being representative of an input signal frequency. Output transducers produce electrical signals corresponding to the energy received at successive segments of the focal arc. The disclosed device includes various combinations of input transducer array improvements, some of which are to provide amplitude weighting of the input array, including aperture width weighting, capacitive weighting, resistive weighting, series-parallel weighting, and source withdrawal weighting. Another improvement in input array configuration eliminates close or overlapping electrodes of opposite polarities and thereby reduces parasitic capacitance and acoustic radiation between electrode elements.
    Type: Grant
    Filed: February 15, 1984
    Date of Patent: February 12, 1985
    Assignee: TRW Inc.
    Inventors: Robert B. Stokes, Kuo-Hsiung Yen, Kei-Fung Lau, Reynold S. Kagiwada, Michael J. Delaney
  • Patent number: 4496863
    Abstract: Cooling medium flows from the rotor of a rotary electric machine from a rotor side towards an air gap side between the rotor and stator of the machine, wherein provision is made of guide vanes such that the cooling medium flows in a direction opposite to the direction in which the rotor rotates, reducing the angular momentum of the coolant to zero, to increase circulation efficiency.
    Type: Grant
    Filed: April 18, 1983
    Date of Patent: January 29, 1985
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Kenji Sawatani
  • Patent number: 4496865
    Abstract: Methods of operating, and apparatus including, a rotary electric motor to translate rotation of the motor into linear travel with the aid of a linearly traveling device. This linearly traveling device is restrained against rotation at points peripherally distributed relative to the device. In particular, there is a pair of interfitting parts including a linear keyplate and keyway at each of the peripherally distributed points. One of these interfitting parts is connected to the linearly traveling device and the other of these parts is maintained stationary relative to that one interfitting part. One of the linear keyplates may be provided with a first scale indicating the linear travel in a first system of measurement, such as the metric system, and another linear keyplate may be provided with a second scale indicating the linear travel in a second system of measurement, different from the first or metric system.
    Type: Grant
    Filed: August 12, 1982
    Date of Patent: January 29, 1985
    Assignee: Newport Corporation
    Inventors: Robert E. Allen, James T. Thomasson
  • Patent number: 4494031
    Abstract: N.sup.2 acoustic wave devices (A,B,S,T; where N is an integer greater than unity) with substantially the same electrical impedance and transfer characteristics at a given operating frequency are electrically connected in a parallel-series arrangement which has substantially the same electrical impedance and transfer characteristics as any one of the individual N.sup.2 devices, but an increased active device area. The increased active area reduces stress and alleviates acoustically-induced migration in the metal of, for example, transducer electrode fingers (6,7) of resonators at high power levels. The parallel-series arrangement consists of N groups, each of which comprises N devices (A,B or S,T), the corresponding pairs of terminals (4,54 and 54,55) of which are connected in series.
    Type: Grant
    Filed: March 16, 1983
    Date of Patent: January 15, 1985
    Assignee: U.S. Philips Corporation
    Inventors: Christopher S. Barnes, Paul A. Moore, Philip D. White
  • Patent number: 4492884
    Abstract: In a canned motor including a stator with a cylindrical housing, a stator core having a stator winding and mounted on an inner surface of the motor housing, a pair of end brackets each secured to one of two opposite open ends of the motor housing, a cylindrical can mounted on an inner side of the stator core and secured at opposite ends to the end brackets, and a rotor arranged on an inner side of the can, the stator sealed by the can is filled with a porous insulator. The canned motor having the stator provided with the porous insulator is produced by a method wherein a mixture of filler in particulate form and resin in powder form is poured in a space in the stator sealed by the can, and the mixture is heated to allow the resin to cure to form the filler and resin into a porous body, to achieve molding of the stator and provide it with an insulator in the form of the porous body.
    Type: Grant
    Filed: November 22, 1982
    Date of Patent: January 8, 1985
    Assignee: Hitachi, Ltd.
    Inventors: Etuo Asano, Yasuro Suzuki, Nobuo Midou
  • Patent number: 4491753
    Abstract: A motor has an electromagnetic brake which is connected to the output shaft to brake the rotation of the output shaft, whereby the driving body can be forcibly braked with excellent stopping response.A fan for forcibly cooling the inside of the motor is enclosed in the casing, whereby temperature rises can be prevented by ventilation.A bracket for supporting the iron core of the brake coil is made of a non-magnetic material, whereby the leaked magnetic flux passing through the bearing fixed on the bracket can be prevented, and consequent damage to the bearing heated by the eddy current can be prevented.The stator can be a stator having windings used in a conventional induction motor, and the rotor is a cup type rotor having a simple structure extended in the axial direction. Accordingly, the structure is simple, and the size of the motor in the radial direction can be reduced.
    Type: Grant
    Filed: February 19, 1982
    Date of Patent: January 1, 1985
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Hiroshi Kumatani
  • Patent number: 4491758
    Abstract: A surface wave device (10) having substrate with at least a surface layer of piezoelectric material (12) and at least one pair of opposing electrically conducting pads (14 and 16) is disclosed. A first group of at least three electrodes (18, 20 and 22) in a distance (24) of one half wavelength of a preselected operating frequency is disposed on the piezoelectric surface between the opposing pads. At least one of the electrodes is electrically connected to one of the opposing pads and the remaining electrodes are electrically connected to the other opposing pad. The sequence of the three electrodes is unevenly distributed with respect to which of the pads the electrodes are connected to. At least two additional groups of at least three electrodes similar to the first group have sequences of electrodes within each group that is distinct from the other groups.
    Type: Grant
    Filed: May 3, 1983
    Date of Patent: January 1, 1985
    Assignee: R F Monolithics, Inc.
    Inventor: Clinton S. Hartmann
  • Patent number: 4491757
    Abstract: A surface wave device includes a substrate (12 in FIG. 7) having a surface layer of piezoelectric material (14), at least one pair of opposing electrically conducting pads (16 and 18) and at least two electrodes (20 and 22) which generate surface waves that vary significantly in strength in a direction transverse to the opposing pads. An ungrounded pad (16) forms an electrode array of parallel segmented electrodes (24), joined by electrically conducting connecting bars (26), having more segmented electrodes near the center of the transverse distance than near the pads. A grounded electrode (22) forms a segmented electrode array having segmented electrodes (44) joined by electrically conducting connecting bars (46) having fewer segmented electrodes near the center of the transverse distance than near the pads.
    Type: Grant
    Filed: May 3, 1983
    Date of Patent: January 1, 1985
    Assignee: R F Monolithics, Inc.
    Inventor: Clinton S. Hartmann
  • Patent number: 4489250
    Abstract: A surface acoustic wave device having a lithium tatraborate single crystal substrate is proposed. An electro-mechanical coupling coefficient K.sup.2 of the substrate is about 1% so as to obtain a surface acoustic wave having sufficient practical energy. When cut angles of the substrate and a propagation direction of the surface acoustic wave are expressed by Eulerian angles (90+.lambda., 90.degree., 90.degree.), a thickness t of an electrode formed on the substrate falls within a region bounded by a dotted curve and an alternate long and short dash curve in FIG. 8. The dotted curve and the alternate long and short dash curve indicate the experimental relationship between the cut angle .lambda. and the thickness t when the TCD is set at 5 and -5 ppm/.degree.C., respectively. When the film thickness t is set within the above-mentioned range, the absolute value of the TCD is set at 5 ppm/.degree.C. or less. When the cut angle .lambda. is 25.degree., the TCD of the substrate becomes zero.
    Type: Grant
    Filed: June 27, 1983
    Date of Patent: December 18, 1984
    Assignee: Tokyo Shibaura Denki Kabushiki Kaisha
    Inventors: Yasuo Ebata, Hitoshi Suzuki, Sadao Matsumura, Katsuyoshi Fukuta
  • Patent number: 4488077
    Abstract: An asynchronous electric machine, having an iron core mounted on a shaft, squirrel bars and a short circuit ring connecting the bars at both ends of the rotor, and a stator having a coil winding provided with end turns exterior of the stator. A conductive body made of magnetizable or non-magnetizable material is mounted in the field of the stray magnetic flux pattern formed by the end-turns and the short circuiting ring, to increase losses, and thereby increase starting torque.
    Type: Grant
    Filed: December 3, 1981
    Date of Patent: December 11, 1984
    Assignee: Ganz Villamossagi M/u/ vek
    Inventor: G/a/ bor Kov/a/ cs
  • Patent number: 4488074
    Abstract: In an electromagnetic retarder armature rotor, comprising a disk (1) connected to a securing collar (2) by means of a ring of rams (4, 4.sub.1) forming ventilation fins, the largest diameter portions of these arms projecting axially from the disk and their tops being connected together by an annular flange (5) parallel to the disk, the assembly of the disk, the collar, the arms and the flange forming a single molded block, if we call D the outer diameter of the disk (1), a the axial distance between this disk (1) and the flange (5), b the radial width of this flange (5) and r the inner radius of said flange (5), the ratio Db/ar is between 10 and 30.
    Type: Grant
    Filed: September 27, 1982
    Date of Patent: December 11, 1984
    Assignee: Labavia S.G.E.
    Inventor: Andr/e/ Marandet
  • Patent number: 4488133
    Abstract: A so-called blow-off type current limiting circuit breaker is constructed with a contact pressure spring that also holds the contact arm in open contact position when the contacts are blown open by electrodynamic forces. A multi-section cam means transmits contact opening and closing forces produced by a spring powered overcenter toggle type operating mechanism to the movable contact arm. A follower on the latter is biased into engagement with the cam means by the contact pressure spring. The cam means is so constructed that during contact blow-off the movable contact arm requires relatively little motion to move overcenter in the opening direction. One section of the cam means is constructed so that when the contact arm moves overcenter in the opening direction during contact blowoff, speed of the contact arm is controlled to an extent that contact rebound does not become a problem.
    Type: Grant
    Filed: March 28, 1983
    Date of Patent: December 11, 1984
    Assignee: Siemens-Allis, Inc.
    Inventors: David P. McClellan, Gerald R. Duble, William H. Hofferberth
  • Patent number: 4488069
    Abstract: In the disclosed motor, a stator and a rotor are movable relative to each other about a common axis. The stator has stator poles with radially directed stator teeth arranged in a circle around the axis and the rotor includes a first axial portion and a second axial portion with a permanent magnet located between them. The first portion has a plurality of rotor teeth extending axially along the periphery of the first portion and the second portion has a substantially cylindrical surface.
    Type: Grant
    Filed: August 10, 1983
    Date of Patent: December 11, 1984
    Assignee: Sigma Instruments Inc.
    Inventor: John H. Field, II
  • Patent number: 4488071
    Abstract: A windshield wiper mechanism includes a motor-driven reciprocating link oscillating on a rotary wiper-arm shaft via an arm secured to the shaft. A limit switch is slidably mounted on a fixed plate through rivets and an elongate slot and a friction material. An operating member of the limit switch is engaged by a member mounted on the arm. The limit switch is mounted so that the force required to move it relative to the plate is greater than that required to operate the operating member, but less than the maximum force which can be applied by the motor to the arm. The position of the limit switch can thus be initially set automatically. A plate on the body of the switch provides an abutment for the member on the arm so that the overwiping and unwanted locking of the mechanism is prevented by the abutment, which is automatically set in the required position initially.
    Type: Grant
    Filed: March 7, 1984
    Date of Patent: December 11, 1984
    Assignee: Lucas Industries Public Limited Company
    Inventor: Robert J. Lane
  • Patent number: 4488072
    Abstract: A terminal plate is permanently affixed to a stator frame below the connector rings. High-voltage bushings are installed in the terminal plate at the user's site. Conducting bars are employed between each connector ring and its respective high-voltage bushing. Each conducting bar terminates at a short tangential distance from a connecting portion of its related high-voltage bushing. Domed flexible straps interconnect the conducting bars with the high-voltage bushings, the domed portions of the straps oriented to absorb relative motion engendered by tangential forces on the stator core and connector rings.
    Type: Grant
    Filed: June 8, 1983
    Date of Patent: December 11, 1984
    Assignee: General Electric Company
    Inventors: James B. Archibald, Frederick J. Rink, Jr.
  • Patent number: 4486676
    Abstract: The end turn region of a superconducting rotor is provided with end region support blocks that together provide channels for coil location. Within the support block channels there are intermittent supports in the form of insulating spacers extending radially both to the front and to the rear of the coil and also bottom spacers, with sheets of side insulation between the front and rear spacers and the adjacent support blocks. The intermittent supports provide access of coolant to the superconductor. They may also be formed in a manner to tilt the end region toward the pole piece for better mechanical support. A top insulating spacer is provided with cooling channels and is utilized with banding to provide secure compressive support for the end windings. Apertures in the support blocks and grooves in the spacers provide collant circulation.
    Type: Grant
    Filed: January 16, 1984
    Date of Patent: December 4, 1984
    Assignee: Electric Power Research Institute, Inc.
    Inventors: William G. Moore, Phillip W. Eckels, Michael R. Jugan
  • Patent number: 4486683
    Abstract: Nylon 11 (.gamma.-phase) is electrically poled after it is crystallized f commercially available nylon 11 by rapidly crystallizing it from the molten state. The .gamma.-phase nylon 11 so obtained exhibits high piezoelectric properties when poled under different poling conditions at different temperatures. The electrically poled .gamma.-phase nylon 11 is used in a transducer.
    Type: Grant
    Filed: October 26, 1981
    Date of Patent: December 4, 1984
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Brian A. Newman, Kook D. Pae, Jerry I. Scheinbeim