US1834359A

US1834359A - Electrical phonograph apparatus

Info

Publication number: US1834359A
Application number: US176089A
Authority: US
Inventors: Melvin E Vansickle
Original assignee: BRANDES LAB Inc
Current assignee: BRANDES LAB Inc; BRANDES LABORATORIES Inc
Priority date: 1927-03-17
Filing date: 1927-03-17
Publication date: 1931-12-01
Anticipated expiration: 1948-12-01

Description

Dec. l, 1931. M. E. vANslcKLE 1,834,359

ELECTR ICAL PHONOGRAPH APPARATUS Filed March 1'7, 1927 2 Sheets-Sheet 1 25 Y T ,Y I HYVENTOR, 7 f/ZWZ mw/; 35 34 y BY ATTORNEY Decl, 1931- M. E. vANslcKLE 1,834,359

ELECTRICAL PHONOGRAPH APPARATUS Filed March 1'7I 1927 2 Sheets-Sheet 2 jrs. 5 UE; 5

IN VEN TOR.

@falkag Vafzs Z631 BY y ATToRNE Patented Dec. 1, 1931 UNITED STATES PATENT oFFlcE MELVIN VANSICKLE, OF NEXARK, NEW JERSEY, ASSIG-NOR T0 BRANDES LABORA- TORIES, INC., OF NEWARK, NEW JERSEY, A CORPORATION OF NEW'J'ERSEY ELECTRICAL PHONOG-RAPI-I APPARATUS Applicatibn mea Maren 17, 1927. seriaiNo. 176,089.

My invention relates broadly to electrical phonograph pickup devices and more'` particularly` to an electromagnetic phonograph pick-up device.. Y v y A @ne ofthe objects of my invention is to provide a construction of electrical phonograph pick-up device comprising a'relatively small number of parts assembled in acompact manner for actuation by the stylus of the phonograph for securing relatively large changes in the magnetic condition of an electromagnetic winding for controlling an electron tube amplification system at relatively large amplitude.

Another object of my invention is'to provide a construction of electromagnetic actuator for velectrical phonographs in which an armature member is mounted within an electromagnetic winding for actuation by the stylus of a phonograph for effecting changes Y in the magnetic condition of the electromagneticv winding in accordance with a sound record. I 4

Another object of my invention is to provide'a construction of electrical phonograph pick-up device in whichan armature member in the form of a pedestal is rockablyl mountedrwithin an electromagnetic winding,"the armature member being flanged intermediate the ends thereof to allow the resilient-setting of the, armature within the vcasing fof the pick-up Vdevice in a position in which vibrations from a stylus may be readily transferred to the. armature.

Another object of my invention is'to provide a construction of electrical phonograph pick-up device in which an armature member is caused to be rockably mounted within' an electromagnetic winding and in cor-operation with a stylus in such manner that the armature member may be vibrated in either of' two directions. according as the stylus is required to follow vertically` orlaterally formed sound records.

Other and still further objects of my in-l vention reside .in the construction and arrangement of parts for the electrical phonograph pick-up as described in the following specication and illustrated in the accompanying drawings, in which:

f Figure 1 is side elevation of a phonograph showing the electrical pick-up of my n invention in' positionon the phonograph; Fig. 2 is a longitudinal cross-sectional view taken' through the electrical phonograph pick-up; Fig.`3 is a cross-sectional view taken 'von line 3-3 of Fig. 2; Fig.: t is alateral crosssectional view taken through the phonograph pick-up on line 4-41 of Fig. 3*; F ig'. 5 is a lateral cross-sectional view taken through the :electrical phonograph pick-up on ]ine 5-5 of Fig. 3; Fig. 6 is a cross-sectional view taken through the electrical phonograph pick-up on 'line 66 of Fig. 2 ;,Fig. 7 shows the arrangement of pole members by which the upper end of the armature is controlled; and Fig. 8 is a side elevation of the armature member em- 'Vployed in the electricalv phonograph pick-up of my invention. Y,

Referring to the drawings in more detail,

reference character 1 illustrates the phonograph which is equipped Vwith the electrical pick-up of my invention. Reference character 2 indicates the revolvable record table for the phonograph arranged to carry record 3 over which the arm 4: is arranged to swing. Theelectrical phonograph pick-up device is illustrated' at 5 as 4comprising a supporting member 7 and socket member 6 which may fit into the end of the arma. A permanent magnet 8 is positioned with respect to the sup-l porting member 7 by means of a clamping 'strip`9 and"'scrfew member 10. I provide a pair of

pole pieces

11 and 12 between the poles of the permanent magnet 8, the pole pieces terminating in arcuate shaped pole faces 84 and 85 on opposite sides of thearmature'member 19 andare secured in position by'means of screw members 111 and V15 which extend through the supporting member 7 A resilient pad 16 is positioned withv respect to a spacerplate V17 and'upper resilient pad 18as represented: in Figd and between the vresilient pads 16 and 18 the armature member 19 is centered and-resilientlysupported, the flange 20 thereof being gripped on its opposite faces by the resilient pads 18 and 16. The armature member 19 has one end thereof reduced and formed in polygonal cross secvtion .as represented at 21. V'A resilient sleeve 22 fits over the polygonal portion 21 of the armature 19 and forms an abutment for the

pole pieces

23 and 24 which are adjustable upon the

pole members

11 and 12 by means of screws 23a and 24a operating in slots 235 and 24?). The coil support 26 is mounted between the

pole members

11 and 12 and the

pole pieces

23 and 24. This coil support has a hollow core through which the armature 19 passes. An electromagnetic winding 25 is carried by the coil support 26 and is subjected to changes in its magnetic condition in ac-. cordance with vibrations of the armature member developed by movement imparted thereto from the stylus 30 which is mounted and secured in the socket member 29 by means ofadjustable set screw 31.

It will thus be seen that the armature member 19 is adapted to be vibrated in either of two planes according as the stylus .30 is required to follow a vertically formed sound track or a laterally formed sound track of the sound record. The

pole pieces

23 and 24 are so arranged with respect to the `armature member 19 that the lines of magnetic flux will be varied in accordance with the vibration of the varmature member irrespective of the plane in which the vibration is set up.

The entire assembly is housed within the cover portion 27 secured through the strip 9 by means of screw members 2.8 forming a dust proof casing for the phonograph pickup. Conductors 36 lead from the electromagnetic winding 25 through the socket 6 to suitable contact members by which they may be plugged into cooperating sockets in the phonograph arm 4 for establishing con-nection with the electron tube amplification apparatus which may be positioned within the phonograph cabinet.

VThe electrical phonograph piclcup of my invention comprises a relatively small number of parts thereby facilitating manufacture and production and decreasing the manufacturing cost.

While I have described the invention in its preferred embodiment, I desire it to be understood that modications may be made and that no limitations are intended other than are imposed by the scope of the appended claims. j Y

What I claim as new and desire to secure by Letters Patent of the United States is as follows: V

l. An electrical phonograph pick-up comprising a supporting member, a permanent magnet carried by said supporting member, a pair of pole pieces positioned between the poles of said permanent magnet, said pole pieces terminating in arcuate shaped pole faces directed toward each other, at one end and having pole faces cut on opposite angles posed within an electromagnetic winding and having a circular cross-section throughout a portion of its length and a polygonal cross-section adjacent the end thereof, whereby said pole faces conform to the contour of said armature, and a stylus carried in the end of said armature member for transferring vibrations to said armature member and variably controlling the magnetic condition of said electromagnetic winding.

2. An. electrical phonograph pickup comprising a supporting member, a permanent magnet carried by said supporting member, a pai-rof pole pieces positioned between the poles of said permanent magnet, said pole pieces terminating in arcuate shaped pole faces directed toward each other at one end and angularly formed pole faces at the opposite end, an electromagnetic winding positioned between said pole pieces, an armature member having an integral flange intermediate the ends thereof with a portion of its length circular in cross-section and a portion thereof polygonal in cross-section, whereby said pole faces closely conform to the contour of said armature, means secured to said supporting member for resiliently gripping opposite sides of said flange for positioning said armature member within said electro- 4viagnetic winding, a stylus carried in one end of said armature memberv for displacing said armature member within said electromagnetic winding and effecting a change in the magnetic condition thereof.

3. An electrical phonograph pick-up comprising a supporting member, a permanent magnet carried by said supporting member, a pair of pole members positioned between the poles. of said permanent magnet, said pole members having arcuate shaped pole vfaces directed toward each other, a pair of adjustable pole faces secured to the opposite ends of said pole members, a cylindrical armature member having an integrally connected fiange intermediate the ends thereof, means for resiliently gripping opposite faces of said flange in a position adjacent said arcuate shaped pole faces, said armature member carrying a stylus at'one end and projecting beyond said adjustable pole faces at Vthe opposite ends of said pole members, and an electromagnetic winding positioned between said pole members and said adjustable pole faces and concentrically positioned about said armature member whereby vibrations of said stylus in either of two planes angulariy disposed to one another when imparted to said armature member will effect changes in the magnetic condition of said electromagnetic winding. Y

4. An electrical phonograph pick-up comprising a supporting member, a permanent magnet carried by said supporting member, a pair of pole members positioned between the poles of said permanent magnet, said pole through members terminating in arcuate shaped pole faces, a pair of adjustable pole faces positioned upon the opposite ends of said pole members, an electromagnetic winding loc-ated between said pole members, an armature member having a cylindrical body portion and an integrally connected cylindrical flange, means gripping opposite faces of said flange for rockably mounting said armature member between said pole faces and within said electromagnetic winding, one end of said armature member carrying a stylus and the opposite end of said armature having end portions thereof shaped to conform to the portion of said amature adj acent thereto so that equal movements of said armature in said directions cause substantially equal changes of magnetic flux in said armature.

In testimony whereof I affix my signature.

MELVIN E. VANSICKLE.

member having a polygonal shape and being Y covered by a sleeve of resilient material arranged to be centered between correspondingly shaped pole faces of said adjustable pole members, whereby vibrations of said stylus in either of two planes angularly disposed to one another when imparted to said armature member will effect changes in the magnetic condition of said electromagnetic winding.

5. In a phonograph pick-up device having a magnetic circuit, the combination of, a pair of pole pieces forming a part of said magnetic circuit, an armature disposed in a gap between said pole pieces and mounting means for said armature to allow movement thereof in said gap in directions to reproduce vertically and laterally cut records in the same posit-ion of the device relative to the records.

6. In a phonograph pick-up device having a magnetic circuit, the combination of, a pair of pole pieces in said magnetic circuit forming two gaps therein, an armature passing one of said gaps and having an end portion thereof disposed in the other of said gaps, said end portion having a substantially square cross section and each of said pole pieces being shaped to conform to two sides of said end portion, and means for mounting said armature to allow movement thereof in two directions relative to said pole pieces.

7. In a phonograph pick-up device having a magnetic circuit, the combination of, lan

armature forming a part of said magnetic circuit, mounting means to allow movement of said armature in two directions substantially perpendicular to each other, apair of pole pieces forming another part of said magnetic circuit and a gap therein, an end portion of said armature disposed in said gap, and end portions of said pole pieces shaped with respect to said armature end portion so that equal movements of said armature in said directions produce substantially equal changes of magnetic iiux in said armature.

8. In a phonograph pick-up device having an armature disposed in a gap between two poles of a magnetic circuit, means for mounting said armature to allow movement thereof in either of two directions relative to said poles, said directions being substantially perpendicular to each other and said pole pieces