US1769902A - Phonograph pick-up apparatus - Google Patents

Phonograph pick-up apparatus Download PDF

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Publication number
US1769902A
US1769902A US231374A US23137427A US1769902A US 1769902 A US1769902 A US 1769902A US 231374 A US231374 A US 231374A US 23137427 A US23137427 A US 23137427A US 1769902 A US1769902 A US 1769902A
Authority
US
United States
Prior art keywords
armature
pole
phonograph
pick
faces
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US231374A
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English (en)
Inventor
Harry A Summers
Sigurd A Sollie
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Federal Telegraph Co
Original Assignee
Federal Telegraph Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Federal Telegraph Co filed Critical Federal Telegraph Co
Priority to US231374A priority Critical patent/US1769902A/en
Priority to GB20964/28A priority patent/GB300115A/en
Priority to FR664735D priority patent/FR664735A/fr
Application granted granted Critical
Publication of US1769902A publication Critical patent/US1769902A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H04R11/08—Gramophone pick-ups using a stylus; Recorders using a stylus

Definitions

  • One of the objects of our invention is to provide a construction of electrical pick-up apparatus for electrical phonographs which is capable of manufacture and production inexpensively on a quantity production basis.
  • Another object of our invention is to provide a construction of electrical phonograph pick-up which is designed to reproduce accurately the ntire range of musical notes encountered in phonograph reproduction.
  • a further object of our invention resides in the construction of the pole pieces in an electrical phonograph pick-up device and mounting for an armature member in an electrical phonograph pick-up where the armature member is free to rock without the provision of mechanical pivots or trunnions at the ends thereof.
  • an armature member for an electrical phonograph pick-up wherein the armature member is provide with a central longitudinally extending body portion, a wedge or triangularly shaped head thereon and laterally protruding portions at opposite sides of the central body portion, the laterally protruding portions being provided with knife edges arranged to pivot upon a bearing provided in the pole face of one of the pole pieces constituting the electricfl phonograph pick-up.
  • Figure 1 is a perspective view showing the completed electrical phonograph pick-up of our invention
  • Fig. 2 is a plan View of the phonograph pick-up of our invention
  • Fig. 3 is an end view of the phonograph pick-up of our invention illustrated partially in crosssection to show the arrangement of pole pieces and the mounting of the armature with respect thereto
  • Fig. 4 is a side view of the cover to the accompanying drawings,.
  • Fig. 7 is a view of the several parts constituting the electrical phonograph pickup and illustrating the relationship of the parts preparatory to the assembly process for the electrical phonograph pick-up device.
  • reference character 1 designates a foundation plate structure which carries the several parts of the electrical phonograph pick-up.
  • Upstanding lugs 2 and 3 are provided on base 1, forming trunnions for the pivotal mounting of yoke member 6 in bearings 4 and 5.
  • the yoke 6 is secured to the end of swivel. arm 7 which is pivotally mounted upon the phonograph cabinet structure.
  • a casing 8 is provided which fits snugly around a flanged portion of the base 1 and encloses the several parts of the electrical phonograph pick-up.
  • a permanent magnet 9 is mounted on the d foundation plate 1 and is retained in position by means of a strip member 10 having a screw devicell passing therethrough and anchored in a screw threaded bushing 12 which is cast into the upstanding portion 14 of the base 1.
  • the base 1 is provided with an inclined plane portion 15 extending between the poles of the permanent magnet 9.
  • the base member 1 is apertured as represented at 16 enabling armature 17 to protrude therethrough.
  • the armature 17 has an inwardly extending bore 19 with a stylus 18 secured therein for engagement with a sound record shown at 36 in Fig. 1 as carried by a record table 37.
  • a pair of pole pieces 20 and 21 shaped as shown in Fig.
  • pole faces 20 are mounted between the ends of the perma-. nent magnet 9 and have sets of pole faces directed toward each other.
  • the pole faces are bifurcated at 20"20", and at 21 -21
  • the pole faces 20 are V shaped and have a non-magnetic metal central portion 20 set 20 and 21 with a rubber strip member 24.
  • stops 25 and 26 are s stantially-flat with inwardly extending tongues 25 and 26*, the tongues being bent atacute angles'with respect to the under surface of the plate members and provid ing' abutments ad]acent the bifurcated pole faces in slots 20 and 21 with the resilient strip 24 which extends over the wedge shaped head 22.
  • the resilient strip 24 serves as a cushion between the sides of the wedge shaped hea d 22 and the tongues 25 and 26.
  • Each of the plates 25 and26 are slotted as represented at 25? and 26 enabling screw members 25 and 26 to be screwed into pole pieces 20 and 21 and adjusted with respect to the wedge shaped head 22 of the armature 17.
  • Sets of washers 25 and 26 are positioned wit-h the heads of screws 25 and26 and the plate members 25 and 26.
  • the electromagnetic winding is shown in the form of a bobbin 28 wound upon the insulated support 27 which fits between the pole members 20 and 21 as illustrated with the sets of pole faces at opposite ends of the electromagnetic winding.
  • the armature member 17 passes through the electromagnetic winding 28 and has the wedge shaped head 22 thereof engaged on opposite sides by theresilient strip 24.
  • the laterally protruding portions'of the armature are provided with knife edge faces 17 and 17 which engage the. bearing member 20 in the V- shaped faces 2O of the pole member 20.
  • the opposite faces of the laterally protruding portions of the armature are circular as indicated at 17 and 17 conforming with the shape of the pole faces 21.
  • a resilient strip 23Y is seated between the rounded faces 17 and 17 which are spaced from the rounded faces 21 of pole piece 21 by means of resilient strip 7 i 23.
  • a screw device 29 extends into the end of the armature member and secures the stylus 18 in the recess 19 in the armature 17.
  • Electrical conductors 32 extend 'from the electromagnetic winding 28 to the lug members 83 and33 of binding posts 33 which are carried by terminal block 31 on the foundation plate structure 1.
  • Flexible leads 30' extend from the binding posts.
  • An electrical phonograph pick-up comprising a foundation plate arranged to lie in a plane substantially parallel to a phonograph record during the movement of the pick-up over the record, an inclined plane member at (inc end of said plate, a pair of pole members mounted on said inclined p ane member and directed toward each other laterally with respect to said plate, an armature mounted for swinging movement between said pole members in a plane passing through the longitudinal axis of said plate, and means at the opposite end of said plate member for pivotally supporting said phonograph pick- 2.
  • An electrical phonograph pick-up comprising a foundation plate, an inclined plane member at one end of said plate, a permanent magnet carried by said plate member and extending on opposite sides of said inclined plane member, an electromagnetic winding, a pair of pole pieces mounted on said inclined plane and directed toward each other, said pole pieces having faces extending on opposite sides of said electromagnetic winding, one of said pole faces being arcuate in shape and the opposite pole face being V shaped, and an armature member having a rounded face at one side and knife edge contact faces at the opposite side with the knife edge of said armature member in engagement with said V shaped pole'face, and resilient means between the rounded face of said armature member and the arcuate shaped pole face.
  • An electrical pickup comprising a foundation plate member arranged to lie in a plane substantially parallel to a phonograph record during the movement of the pick-up over the record, an inclined plane at one end of said foundation plate member, a permanent magnet carried by said plate member and extending on opposite sides of said inclined plane, pole pieces carried by said inclined plane and directed toward each other, one of said pole pieces having a V shaped face, an armature member, a nonmagnetic insert within said V shaped face providing a bearing for said armature member and means at the opposite end of said plate member for pivotally supporting said phonograph pick-up.
  • a terminal-block at one end of the plate member, an inclined platform at the opposite end of the plate member, a permanent magnet carried by said plate member and surrounding said platform, a pair of pole pieces fitted on saidv inclined platform and extending between the poles of saidpermanent magnet, an electromagnetic winding disposed between said pole pieces, an armature member rockable within said electromagnetic winding and driven by a stylus connected with said armature member and means on said plate member on opposite sides of said terminal block for pivotally supporting said phonograph pick-up.
  • a triangularly shaped head thereon, adjustable members on opposite sides of said triangularly shaped head for damping the movement of said armature, laterally extending portions on said armature, rounded faces at one side of said laterally extending portions and knife edges at opposite sides of said laterally extending portions.
  • a foundation plate member arranged to lie in a plane substantially parallel to a phonograph record during the movement of the pickup over the record, an electromagnetic actuator carried by said foundation plate member, an electromagnetic winding, an armature pivotally mounted within said electromagnetic winding, pole members surrounding said electromagnetic winding, the pole members being bifurcated at their upper ends and aligned with respect to each other, adjustable plate members having tongues disposed at an angle to theplane of said plate members, a triangularly shaped head on said armature, a resilient member disposed between the sides of the triangularly shaped head and the tongues on said plate members and means adjacent one end of said plate member for pivotall y supporting said phonograph pick-up.
  • armature member positioned within said windmg, a pair of pole members havlng b1- furcated pole tips directed toward each other, the upper set of pole tips being cut at an angle with respect thereto for resiliently damping the movement of said armature member and the lower set of pole tips having a pair of concave faces with the opposite pole tip having a pair of V shaped faces, said armature member having a pair of knife edges cooperating with the V shaped faces on one of the pole tips, and a rounded surface record during the movement of the pick-up over the record, means located centrally of said plate member for retaining a permanent magnet in horizontal alignment thereon, an inclined plane adjacent one end of said plate member and between the poles' of said permanent magnet, pole pieces secured to said inclined plane and directed toward each other between the poles of said permanent magnet, an electromagnetic winding, an armature member rockably mounted in said pole pieces and passing through said plate member substantially perpendicular to said inclined plane, a stylus carried by said armaure memher for imparting movement
  • An electromagnetic translating device comprising, a base member,- a permanent magnet carried by said base member, a pair of pole pieces bet-ween the poles of said permanent magnet, an inclined member on said base member adjacent one end thereof, means for mounting said pole pieces on said inclined member, an armature movable between said pole pieces, and a stylus carried by said armature, said armature being mounted so that said stylus is substantially perpendicular to said inclined member, whereby when said base member is in parallel relation to a phonograph record said stylus is disposed'at an angle to said phonograph record.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
US231374A 1927-11-05 1927-11-05 Phonograph pick-up apparatus Expired - Lifetime US1769902A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US231374A US1769902A (en) 1927-11-05 1927-11-05 Phonograph pick-up apparatus
GB20964/28A GB300115A (en) 1927-11-05 1928-07-19 Phonograph pick-up apparatus
FR664735D FR664735A (fr) 1927-11-05 1928-11-05 Pick-up électrique pour phonographe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US231374A US1769902A (en) 1927-11-05 1927-11-05 Phonograph pick-up apparatus

Publications (1)

Publication Number Publication Date
US1769902A true US1769902A (en) 1930-07-01

Family

ID=22868953

Family Applications (1)

Application Number Title Priority Date Filing Date
US231374A Expired - Lifetime US1769902A (en) 1927-11-05 1927-11-05 Phonograph pick-up apparatus

Country Status (3)

Country Link
US (1) US1769902A (fr)
FR (1) FR664735A (fr)
GB (1) GB300115A (fr)

Also Published As

Publication number Publication date
GB300115A (en) 1929-06-20
FR664735A (fr) 1929-09-06

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