Did You Know...
...that power steering was invented by independent inventor Francis W. Davis? As chief engineer in the 1920s of the truck division of the Pierce Arrow Motor Car Company, he saw how hard it was to steer heavy vehicles. So that he would be able to keep the profits from his future invention, Davis left his job, rented a small engineering shop in Waltham, Mass., and developed a hydraulic power steering system that led to power steering.
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| Number | Title | Issue Date |
| 6158109 | Coil manufacturing method using ring shaped spacer A spacer for mounting around the outer peripheral surface of a bobbin. The spacer has first and second edge surfaces formed in a circular arc shape. Subsequent to the formation of a first coil by winding wire around the bobbin, the wire is continuously cu... | 12/12/2000 |
| 6130955 | Voice coil assembly Voice coil assemblies are designed so that the solder points which connect the coil wires and the stranded wires, are connected via a separate adhesive seam to the diaphragm or the voice coil carrier. According to the invention, the solder points are plac... | 10/10/2000 |
| 6111972 | Diffusing volume electroacoustic transducer An electroacoustic transducer includes a low density diffusing volume which supports on its periphery at least one electrically conductive circuit through which an electric signal representative of the signal to be emitted passes. Magnets are mechanically... | 08/29/2000 |
| 6097828 | Electroacoustic transducer In an electroacoustic transducer having an outer case integral with lead terminals and a drive section including a coil disposed in the outer case with both coil terminals of the coil being led out on and connected to lands of the lead terminals, the land... | 08/01/2000 |
| 6072886 | Electroacoustic transducer comprising spring contacts formed with at least one bend In an electroacoustic transducer (1) including a substantially hollow cylindrical magnet system (9) which is substantially centro-symmetrical with respect to a transducer axis (2), a diaphragm (17) and a voice coil (16) connected to the diaphragm (17) hav... | 06/06/2000 |
| 5937076 | Magnetic drive apparatus and method for manufacturing coil that forms the apparatus A spacer for mounting around the outer peripheral surface of a bobbin. The spacer has first and second edge surfaces formed in a circular arc shape. Subsequent to the formation of a first coil by winding wire around the bobbin, the wire is continuously cu... | 08/10/1999 |
| 5838809 | Speaker A tinsel cord support member 30 is formed on a gasket 24, two grooves for supporting tinsel cords 26 and conducting them from a tip end portion of the tinsel cord support member 30 up to near terminal lugs 28 are formed at predetermined intervals from eac... | 11/17/1998 |
| 5249236 | Wiring structure of loudspeaker A wiring structure of a loudspeaker includes first two conductive areas formed on a damper; second two conductive areas formed on the outer peripheral surface of a voice coil bobbin, the first and second two conductive areas serving as the conductor for s... | 09/28/1993 |
| 5040221 | Compact electroacoustical transducing with flat conducting tinsel leads crimped to voice coil ends A loudspeaker driver has a plastic basket having front and rear portions. The front portion is formed with six radial ribs extending between a central motor cup support and an annular rim. A cup-shaped front pole piece is molded into the pole support and ... | 08/13/1991 |
| 5027412 | Voice coil with rectangular coil wire and foil leads A coil for a speaker in which a rectangular coil wire is formed by being cut from a sheet and then wound on the bobbin with its long direction disposed radially. Electrical connection is made to at least one end of the coil wire by ultrasonic welding to a... | 06/25/1991 |
| 5014323 | Voice coil lead dressing A moving coil loudspeaker including a bobbin, a cone secured to the bobbin by cement, a spider secured to the bobbin by the cement, a voice coil including a first electrical wire that is wrapped around the bobbin and has ends supported by the bobbin, and ... | 05/07/1991 |
| 5008945 | Water-proof speaker unit In a speaker unit having a voice coil bobbin, a diaphragm and a damper, the voice coil bobbin is integrally molded with at least one of the damper and diaphragm. The voice coil may be molded into the voice coil bobbin, and the brocade lead wires from the ... | 04/16/1991 |
| 4902996 | Movable coil driving unit A movable coil driving unit comprises a driven member movably supported by conductive flexible supporting members with respect to a fixed member, a coil fixed to the driven member, and a driving member provided with a power source. One ends of the support... | 02/20/1990 |
| 4829582 | Electrodynamic transducer An electrical transducer comprising a magnet system (1), a diaphragm (5) and a voice-coil device (3, 4), coupled to the diaphragm. The voice coil (3) is situated in an air gap (2) of the magnet system and the magnet system is coupled to a chassis (7). The... | 05/09/1989 |
| 4807295 | Loudspeaker A loudspeaker design that eliminates the close tolerance magnetic gap used in conventional loudspeakers and in which motion of the diaphragm is produced by the attraction and repulsion of the magnetic poles of a solenoid and a permanent magnet. In the pre... | 02/21/1989 |
| 4680800 | Moving-coil loudspeaker unit The moving coil loudspeaker drive-unit comprises a voice coil (4) wound on a former (3) and having fixed thereto a diaphragm (6) and a rear suspension spider (5). The drive unit of the invention comprises a component part build-ring (7) incorporated with ... | 07/14/1987 |
| 4539442 | Loudspeaker The moving coil (voice coil) of the loudspeaker is so designed that the loudspeaker will become suitable for automatic production. For this purpose, the moving coil is positioned on a coilform, and as a connecting line extending to the ends of the moving ... | 09/03/1985 |
| 4479035 | Ceramic voice coil assembly The present invention is a ceramic voice coil assembly for use in a loudspeaker system which includes a ceramic voice coil form which is formed out of a high temperature ceramic material such as Al2 O3, BeO or glass and which has an ... | 10/23/1984 |
| 4413162 | Moving coil transducers using multiple-stranded coils A moving coil transducer such as a loudspeaker has its coil formed of multiple strand or litz wire. The structure includes a form having multiple turns of the stranded wire thereon, and the leads or ends of the stranded wire forming the coil extend contin... | 11/01/1983 |
| 4376233 | Securing of lead wires to electro-acoustic transducers An electro-acoustic transducer of the dynamic type, particularly a small loudspeaker or microphone, such as a loudspeaker for use in headphones, comprises a magnetic circuit including an air gap, a diaphragm having a voice coil disposed in the air gap, an... | 03/08/1983 |
| 4315112 | Speaker An improved speaker is provided for stereo headsets and the like. The diaphragm for the speaker comprises the dome of an inverted polyester film cup centered within a flurocarbon film diaphragm member. The voice coil for the speaker is wound directly abou... | 02/09/1982 |
| 4300022 | Multi-filar moving coil loudspeaker The multi-filar moving coil loudspeaker includes a magnetic field structure which provides a unidirectional magnetic flux across an air gap, an acoustic diaphragm, and a coil set positioned in the air gap and connected to the diaphragm. The coil set has a... | 11/10/1981 |
| 4138593 | Moving voice coil loudspeaker with heat dissipating enclosure The dynamic loudspeaker is comprised of a speaker housing and a front sound panel. A diaphragm is mounted at the front of the speaker. A moving-coil unit is mounted in the speaker and includes a moving coil coupled to the diaphragm for transmitting oscill... | 02/06/1979 |
| 4088847 | Speaker voice coil construction A speaker comprising a voice coil assembly including a coil formed by pressure-winding an insulation-covered wire on a portion of the outer periphery of a coil bobbin disposed in the gap of a magnetic field, the beginning and the end of the coil being fix... | 05/09/1978 |
| 4068103 | Loudspeaker solderless connector system and method of setting correct pigtail length A solderless connector for joining the flexible electrical moving leads connecting the voice coil of a loudspeaker to the electrical input terminals located on the loudspeaker frame. The connector supplies electrical continuity between the flexible conduc... | 01/10/1978 |
| 4061890 | Loudspeaker with single layer rectangular wire voice coil wound on slit metal bobbin with a notch in the adjacent pole plate A moving coil loudspeaker is constructed with a low resistance (e.g. one ohm) single layer anodized aluminum rectangular wire voice coil wound on a slit anodized aluminum bobbin and a notch in the adjacent pole plate for the return length of the voice coi... | 12/06/1977 |
