US1726533A - Loud-speaker - Google Patents

Loud-speaker Download PDF

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Publication number
US1726533A
US1726533A US129459A US12945926A US1726533A US 1726533 A US1726533 A US 1726533A US 129459 A US129459 A US 129459A US 12945926 A US12945926 A US 12945926A US 1726533 A US1726533 A US 1726533A
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United States
Prior art keywords
armature
spool
fulcrum
loud
sheet metal
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Expired - Lifetime
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US129459A
Inventor
Baldwin Nathaniel
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Individual
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Individual
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Priority to US129459A priority Critical patent/US1726533A/en
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Publication of US1726533A publication Critical patent/US1726533A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R11/00—Transducers of moving-armature or moving-core type

Definitions

  • the present invention appertains to loud speakersand particularly to those in which large diaphragms or sound boards are used to producethe sound;
  • Fig. 1 is a section of the instrument as applied to a sound hoard such as a panel of a door
  • Fig. 2 is an elevation of part of the structure shown in Fig. 1
  • Numeral 1 designates the armature to be usedand numeral QVdesignates a spool hav ing a, central tubular portion and containing the actuating coil.
  • the armature passes centrally through the tubular portion of the spool and is connected-internally with said spool by means of a flexible fulcrum 3 consisting of a piece of sheet metal ribbon bent at angles so as to provide a straight part connecting the armature with the spool center and fiat surfaces at e-itherend to fasten to the armature and spool center.
  • the middle part of this fulcrum ribbon maybe made more flexible by perforating it and cutting away portions as indicated in Fig. 2.
  • Thespool is held position by U-shaped polepieces 4 and 5 which" are secured to the Q poles'of the horeshoe magnet 6.
  • the magnet 6 is se- .cured to a bar 7 by means of a screw 8 and cross bar 9,'and the bar 7 is secured-to a door by means of the screws 10, 11 and 12.
  • -A pressure upon the link 15 is maintained by a spring 17 seated in the polepiece 4t and pressing against the armature. It will be seen that the position of the armature between the poles pieces is adj ustableby means of the screw 12.
  • a loud speaker comprising a spool, an actuating coil on saidspool, an operating armature within said spool, and a fulcrum of sheet metal nondetachably connected to said armature and to said spool.
  • a loud speaker comprising a spool, an actuating coil on said spool, an operating armature within said spool, and a fulcrum of sheet metal fixed to said armature and to ft.
  • a loud speaker comprising aspool, an actuating coil on said spool, an'operating armature within said spool, a fulcrum of sheet metal for said armature and within said spool,
  • a loud speaker comprising a spool, an actuating coil on said spool,,an operating armature within said spool, a fulcrum of sheet metal for said armature and within said spool, a soundboard, and a link in operative relation with said armature and said soundboard, said link being disposed at an obtuse angle with said armature.
  • a loud speaker comprising an actuating coil, a sheet metal fulcrum within said coil, and an armature mounted on saidfulcrum, the said fulcrum being disposed obliquely to said armature.
  • a loud speaker prising an actuating coil, a fulcrum within said coil, and an armature mounted on said fulcrum, a portion of said fulcrum being non-parallel to said armature and being so; arranged with respect to said armature that functioning of said, fulcrum imparts a longitudinal motion to said armature.
  • a loud speaker comprising an actuating coil, a fulcrum within said coil, and an armature mounted upon said fulcrum, the
  • said fulcrum being formed of a strip of sheet metal having a flexing portion. disposed obliquely to said armature.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)

Description

N. BALDWIN LOUD SPEAKER Sept. 3, 1929.
Filed Aug. 16, '1926 M 3m INVENTOR Patented Sept. 3, 192.9.
UNITED STATES PATENT OFFICE.
LOUD-SPEAKER.
tA pplicationfiled August 16, 1926. Serial No. 129,459.
The present invention appertains to loud speakersand particularly to those in which large diaphragms or sound boards are used to producethe sound;
The principal obj ect is to provide a simple I attain this and other objects by the mechanism illustrated in the accompanying drawing in which Fig. 1 is a section of the instrument as applied to a sound hoard such as a panel of a door, and Fig. 2 is an elevation of part of the structure shown in Fig. 1
Numeral 1 designates the armature to be usedand numeral QVdesignates a spool hav ing a, central tubular portion and containing the actuating coil. The armature passes centrally through the tubular portion of the spool and is connected-internally with said spool by means of a flexible fulcrum 3 consisting of a piece of sheet metal ribbon bent at angles so as to provide a straight part connecting the armature with the spool center and fiat surfaces at e-itherend to fasten to the armature and spool center.- The middle part of this fulcrum ribbon maybe made more flexible by perforating it and cutting away portions as indicated in Fig. 2. Thespool is held position by U-shaped polepieces 4 and 5 which" are secured to the Q poles'of the horeshoe magnet 6. In the-structure as here illustrated the magnet 6is se- .cured to a bar 7 by means of a screw 8 and cross bar 9,'and the bar 7 is secured-to a door by means of the screws 10, 11 and 12. The
49 screw 11 passing through the bar 7 is-tapped into the door 13 and carries a-coil spring 14;
which tends to press the bar 7 against thedoor 13. The position of the bar 7 is adjustable by means of the screw 12. I
A link 15 attached to the armature and having an enlarged portion at one end presses upon the panel 16 and communicates the vibration of the armature to the panel. -A pressure upon the link 15 is maintained by a spring 17 seated in the polepiece 4t and pressing against the armature. It will be seen that the position of the armature between the poles pieces is adj ustableby means of the screw 12. I claim:
said spool.
operated armature fulcrumed within the spool, anda fulcrum of sheet metal, upon which said armature is permanently mounted. 2. A loud speaker comprising a spool, an actuating coil on saidspool, an operating armature within said spool, and a fulcrum of sheet metal nondetachably connected to said armature and to said spool.
. 8. A loud speaker comprisinga spool, an actuating coil on said spool, an operating armature within said spool, and a fulcrum of sheet metal fixed to said armature and to ft. A loud speaker comprising aspool, an actuating coil on said spool, an'operating armature within said spool, a fulcrum of sheet metal for said armature and within said spool,
a sound producing element, and a link in operative relation with said armature and said sound producing element, said link being disposed at an obtuse angle with said armature.
5. A loud speaker comprising a spool, an actuating coil on said spool,,an operating armature within said spool, a fulcrum of sheet metal for said armature and within said spool, a soundboard, and a link in operative relation with said armature and said soundboard, said link being disposed at an obtuse angle with said armature.
6. A loud speaker, comprising an actuating coil, a sheet metal fulcrum within said coil, and an armature mounted on saidfulcrum, the said fulcrum being disposed obliquely to said armature.
7. A loud speaker,.com prising an actuating coil, a fulcrum within said coil, and an armature mounted on said fulcrum, a portion of said fulcrum being non-parallel to said armature and being so; arranged with respect to said armature that functioning of said, fulcrum imparts a longitudinal motion to said armature. p
- 8. A loud speaker, comprising an actuating coil, a fulcrum within said coil, and an armature mounted upon said fulcrum, the
said fulcrum being formed of a strip of sheet metal having a flexing portion. disposed obliquely to said armature.
ATHAME BALDWIN.
US129459A 1926-08-16 1926-08-16 Loud-speaker Expired - Lifetime US1726533A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US129459A US1726533A (en) 1926-08-16 1926-08-16 Loud-speaker

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US129459A US1726533A (en) 1926-08-16 1926-08-16 Loud-speaker

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US1726533A true US1726533A (en) 1929-09-03

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3178512A (en) * 1962-08-23 1965-04-13 Artnell Company Electrical sound reproducing device
US3187116A (en) * 1961-09-20 1965-06-01 E J Mosher Transducer
EP2343910A1 (en) * 2009-07-29 2011-07-13 Pioneer Corporation Speaker device
US20110243365A1 (en) * 2010-03-31 2011-10-06 Richard Tucker Carlmark Moving Magnet Levered Loudspeaker
US20110243366A1 (en) * 2010-03-31 2011-10-06 Richard Tucker Carlmark Loudspeaker Moment and Torque Balancing
US9055370B2 (en) 2012-08-31 2015-06-09 Bose Corporation Vibration-reducing passive radiators

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3187116A (en) * 1961-09-20 1965-06-01 E J Mosher Transducer
US3178512A (en) * 1962-08-23 1965-04-13 Artnell Company Electrical sound reproducing device
EP2343910A1 (en) * 2009-07-29 2011-07-13 Pioneer Corporation Speaker device
EP2343910A4 (en) * 2009-07-29 2013-05-22 Pioneer Corp Speaker device
US20110243365A1 (en) * 2010-03-31 2011-10-06 Richard Tucker Carlmark Moving Magnet Levered Loudspeaker
US20110243366A1 (en) * 2010-03-31 2011-10-06 Richard Tucker Carlmark Loudspeaker Moment and Torque Balancing
US8295536B2 (en) * 2010-03-31 2012-10-23 Bose Corporation Moving magnet levered loudspeaker
US8295537B2 (en) * 2010-03-31 2012-10-23 Bose Corporation Loudspeaker moment and torque balancing
US9055370B2 (en) 2012-08-31 2015-06-09 Bose Corporation Vibration-reducing passive radiators

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