US2295092A - Automatic stop mechanism for magazine phonographs - Google Patents

Automatic stop mechanism for magazine phonographs Download PDF

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Publication number
US2295092A
US2295092A US383018A US38301841A US2295092A US 2295092 A US2295092 A US 2295092A US 383018 A US383018 A US 383018A US 38301841 A US38301841 A US 38301841A US 2295092 A US2295092 A US 2295092A
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record
lever
arm
turntable
motor
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Expired - Lifetime
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US383018A
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Offen Francis John
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Garrard Engineering & Manufacturing Comp
Garrard Engineering & Manufacturing Company Ltd
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Garrard Engineering & Manufacturing Comp
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/08—Guiding record carriers not specifically of filamentary or web form, or of supports therefor from consecutive-access magazine of disc records
    • G11B17/12—Guiding record carriers not specifically of filamentary or web form, or of supports therefor from consecutive-access magazine of disc records with axial transfer to the turntable from a stack with a vertical axis
    • G11B17/16—Guiding record carriers not specifically of filamentary or web form, or of supports therefor from consecutive-access magazine of disc records with axial transfer to the turntable from a stack with a vertical axis by mechanism in stationary centre post, e.g. with stepped post, using fingers on post

Definitions

  • This invention relates to an automatic stop mechanism for sound reproducing machines or phonographs.
  • the stop mechanism of the invention is particularly designed for use with an electrically .of the'type referred to that downward .movement of an.
  • a cam shaft is connected through a clutch with the motor driving the turntable.
  • a number of operations are performed during each revolution of the cam shaft.
  • the tone arm with its pickup unit is lifted from the record and swung out of the way.
  • the peripheral support engages the lowermost of the records to drop it into playing position on the turntable.
  • the tone arm is brought into record playing position on the outer groove of the new record on the turntable, which is now in readiness to be played.
  • the stack of records supported over the turntable is pressed by a record abutting or steadying arm.
  • this arm collapses due to its own weight and the. action of a biasing spring.
  • This downward movement of the record arm initiates the operation of the automatic stop mechanism.
  • the cam shaft again rotates in the manner set forth above.
  • the camshaft continues to rotate until the tone arm is swung away from the record.
  • Means are provided] which the cam shaft actuates to operate thestop mechanism, which in turn disengages an electric switch in circuit with the electric drive motor, and also engages a braking mechanism to stop the turntable.
  • Figure l is a view in perspective of one form of phonograph embodying the stop mechanism oi'the invention.
  • Figure 3 is a plan view, on enlarged scale, of a part of Figure 2, showing theautomatic stop mechanism in a position with the electric switch disconnected.
  • Figure 4 is a vertical cross-sectional view taken along line 44 of Figure 2, illustrating the mechanism for releasing the automatic stop mechanismafter the last record has been dropped onto the turntable.
  • Figure 5 is'a sectional. view, substantially on the line 5-.-5. of Figure 4, showing the driving connections between the motor and cam shaft.
  • Figures'6 and '7 are fragmentary views of a detail illustrating different operating positions of the .mechanism' for. releasing the automatic stop.
  • Figure 8 is a. fragmentary vertical cross-sectional view of the record .steadying arminits inoperative position. 7
  • the record changer phono-- H graph comprises base plate Ill, turntable ll. rotatably mounted above base plate 10, and centering spindle I2.
  • Spindle 12 has a shoulder [3. for
  • a further object of the invention is to provide an automatic stop mechanismfor phonographs base plate to, adapted.to-bereciprocated 'ina a-reco'rd is dropped, it engages leaf springs l4 and is retarded, therecord dropping with a minimum of noise.
  • a pusher plate 22 is provided above horizontal direction to disengage the lowermost record from shoulder .13 on spindle 12.1
  • the means forreciprocating record displacing plate 22 and for automatic'ally' moving tone arm l5 and pick-up [6 over the records are not shown since they are not part of the present inven- ⁇ I tlon, and are well known in the art.
  • For thisnpurpose tone arm
  • Fiber roller flend arm 36 engage before the groove" ofi the-record; Each time turntable makes: one revolution, its arm 36. engages-zrollerneedle of pick -up-lfi has reached thejinnermost 34, causing lever 3-1 torotate in the: counterclockwise direction on its pivot 32 against the.
  • roller 34 hasadvanced sufiicie'ntlythat. when'arm 36 strikes the-roller- 34 lever-3
  • Pin 54" is arranged to 'j'u'st rest-upon head 5565 rod 56 -when in its upper position; as long as armZ-FiS- suxipdrtediby a recordonshoulder 3 -of'--spindl 'a
  • mecha nism for automatically stopping the operation of the phonograph when playing of the last stacked record is completed comprising an arm pivotally mounted to abut the last record of the stack to be played, and means coasting with said arm including a plunger, said plunger being arranged ior displacement by said arm when said last record is dropped from the stack; a motor for rotating the turntable; apparatus .engageable with said motor when the playing of each record is completed comprising a cam piece motivated with said apparatus when the apparatus is engaged with said motor, a part normally in the path of said cam piece and displaceable thereby, and a lever flexibly coupled -to said part; an element coactable with
  • mechanism for automatically stopping the operation of the phonograph when'playing of'the last stacked record is completed comprising an arm pivotally escapes mounted above the records to abut-the last record rod and displacing said rod when said last record is dropped from the stack; a motor for rotating the turntable; apparatus engageable'with said motor when the playing of each record is completed comprising a cam piece motivated with said apparatus when the apparatus is engaged with said motor, a part normally in the path of saidcam piece and displacedthereby, and a lever spring coupled to said part; a' pivoted unit abutting'the lower end of said rod and having a portion normally abutting said lever to prevent its displacement, said portion being moved from the abutting position by said rod when said rod is depressed by said arm to permit displacement ofsaid .lever with said part; and
  • mechanism for automatically stopping the operation of the phonograph when playing of the last stacked record is completed comprising a member arranged to abut the last record of the stack to be played, a spring connected to said member to normally press it against the last record, means positively coacting with said member including an element, said element being displaced by the displacement of said member when the last record is dropped from the stack; a motor for rotating the turntable; cyclic apparatus engageable with said motor when the playing of each record is completed comprising a cam piece motivated with said apparatus when the apparatus is engaged with said motor, a part normally in the path of said cam piece and displacea'ble thereby, and a lever flexibly coupled to said part; means abutting said element and having a portion normally abutting said lever-to'prevent its displacement, said portion being moved from the abutting position when said element is

Description

Sept. 8, 1942. F. J. OFFEN 2,295,092
AUTOMATIC STOP MECHANISM FOR MAGAZINE PHONOGRAPHS Filed March 12, 1941 3 Sheets-Sheet l v INVENOR.
Sept. 8,1942. F, J, OFFEN 2,295,092
A AUTOMATIC STOP MECHANISM FOR MAGAZINE PHONOGRAPHS Filed March 12; 1941 3 Sheqts-Sheet 2 INVENTOR. MJ Q W A ATTORNEY.
Sept. 8, 1942. F. J. OFFEN 2,295,092
AUTOMATIC STOP MECHANISM FOR MAGAZINE PHONOGRAPHS Filed March 12, 1941 3 Sheets-Sheet 5 MNVENgZR.
ATTORNEY.
' the turntable.
Patented Sept. 8, 1942 or ac AUTOMATIC STOP MECHANISM FOR -MAGAZINE PHONOGRAPHS Francis John Offen, Swindon, England, assignor to Garrard Engineering & Manufacturing Com pay, Limited, Swindon, England, a corporation of Great Britain Application March 12, 1941, Serial No. 383,018
6 Claims.
This invention relates to an automatic stop mechanism for sound reproducing machines or phonographs.
The stop mechanism of the invention is particularly designed for use with an electrically .of the'type referred to that downward .movement of an.
"eleased by the which abuts the stack-of records.
These and further objects of the invention will become more evident in the following description of a preferred. embodiment of the invention illustrated in the draw ngs. wherein:
with means for engaging only the lowermost record.
Upon the completion of the playing of a record,- a cam shaft is connected through a clutch with the motor driving the turntable. A number of operations are performed during each revolution of the cam shaft. First, the tone arm with its pickup unit is lifted from the record and swung out of the way. Then, the peripheral support engages the lowermost of the records to drop it into playing position on the turntable. Finally, the tone arm is brought into record playing position on the outer groove of the new record on the turntable, which is now in readiness to be played.
The stack of records supported over the turntable is pressed by a record abutting or steadying arm. When the last record has been dropped onto the turntable, this arm collapses due to its own weight and the. action of a biasing spring. This downward movement of the record arm initiates the operation of the automatic stop mechanism. After the last record has been played, the cam shaft again rotates in the manner set forth above. The camshaft continues to rotate until the tone arm is swung away from the record. Means are provided] which the cam shaft actuates to operate thestop mechanism, which in turn disengages an electric switch in circuit with the electric drive motor, and also engages a braking mechanism to stop the turntable.
Figure l is a view in perspective of one form of phonograph embodying the stop mechanism oi'the invention.
- Figure 2 is a plan view, partially broken away,
of the record changer of Figure 1, with the turntable removed to show the automatic stop and associated mechanisms.
Figure 3 is a plan view, on enlarged scale, of a part of Figure 2, showing theautomatic stop mechanism in a position with the electric switch disconnected.
Figure 4 is a vertical cross-sectional view taken along line 44 of Figure 2, illustrating the mechanism for releasing the automatic stop mechanismafter the last record has been dropped onto the turntable.
Figure 5 is'a sectional. view, substantially on the line 5-.-5. of Figure 4, showing the driving connections between the motor and cam shaft. Figures'6 and '7 are fragmentary views of a detail illustrating different operating positions of the .mechanism' for. releasing the automatic stop.
. Figure 8 is a. fragmentary vertical cross-sectional view of the record .steadying arminits inoperative position. 7
Referring to the drawingsyand more particu-' larly tov Figure 1, the record changer phono-- H graph comprises base plate Ill, turntable ll. rotatably mounted above base plate 10, and centering spindle I2. Spindle 12 has a shoulder [3. for
supporting a stack of; records thereon, and is provided with a plurality of leaf springs It. It is to be. understood that other record stacking and changing arrangements may be used. When It is an object of the present invention to" provide an improved automatic stopping mechanism for phonographs.
"it is another object of the invention to provide astop for electrically driven phonographs of the type which automatically. plays a stack of records in succession, the stop mechanism being automatically initiated when the last record has dropped into playing position; and actuated. after that record has been played.
A further object of the invention is to provide an automatic stop mechanismfor phonographs base plate to, adapted.to-bereciprocated 'ina a-reco'rd is dropped, it engages leaf springs l4 and is retarded, therecord dropping with a minimum of noise. A tone arm l5, provided with a standard pickup unit it,'normally rests on support l1 when not in use. .1 i
Standard I8,contains bracket 20. on which a record abutting or steadying arm 2! is 'pivotally mounted. A pusher plate 22 is provided above horizontal direction to disengage the lowermost record from shoulder .13 on spindle 12.1 The means forreciprocating record displacing plate 22 and for automatic'ally' moving tone arm l5 and pick-up [6 over the records are not shown since they are not part of the present inven- {I tlon, and are well known in the art. After a record is played, the next record supportedon shoulder; [act-spindle; I2 ;is dropped .down 'uponit. For thisnpurpose tone arm=| is arm-l5 movestowards" the center-.01 the record.
a suitablemannen'not shown-in the drawg :Lever.-.:;2.4: :is-i-fastened' -to plate: 25.
mentiwlth' lever 26 byrmeans ofra fiber spacer 21 secured to .-lever.:;-.26:;: Lever 26- pivoted-.-at 28 and: :thereforeiirotatesLina ;clcckwisefdirjection as plat follows-the move'mentzof tone arm-1:5. A T flafitnsihh-Zspringiiwikeeps' fiber:spacer 21 in' 1 g constant-engagement withcplate 2-5. .An'other le- 1 ver 3t .i's'l centrally-pivoted: arr-321 110 the. oppositei 'end 'of lever'-.-26;:=and islipressed against a stop 29 7 on lever- 26by biasingspring-533.5.Ahfree end of le'veril is provided-:witha fiberroller'. TurntableH is'rotatedbyshaft =to which an arm 36- is securedw V When lever-1251s=graduallysrotatedin a clock wise direetionpit causes flberrroller 34 onlever 3i toswin'g: into the path of arm-36 which-is rotated in a clockwise direction by turntable shaft 35."
Fiber roller flend arm: 36 engage before the groove" ofi the-record; Each time turntable makes: one revolution, its arm 36. engages-zrollerneedle of pick -up-lfi has reached thejinnermost 34, causing lever 3-1 torotate in the: counterclockwise direction on its pivot 32 against the.
biasing action of'springae. 4
As the tone arm mov'esinwardly, levers 25 and 3| also move -inwardly-byvirtue of the frictional" engagement of'lever 2G. with plate 25. When tone arm- 'l5 reaches the eccentric groove customarily provided as'theinnermost groove on the record."
roller 34 hasadvanced sufiicie'ntlythat. when'arm 36 strikes the-roller- 34 lever-3| is 'pivotedi'against spring 33. This movement, causes the opposite end N of lever 3-I 't'o engage and actuate a fur-f ther lever 38 pivoted. at 40 onthe frame. Lever 38 isarrangedtd engage with a le'verfflywhich" is shown in gures i and 5."
' mine issecu red' to "camshaft -45. One revolution of places thQtcne'arm-"JS'"and pick-up 16' upon the Themo to 4B jdrivesturntableshaftj35 as' w'ell as Shaft 42-;towards clutchsection 48-.
is out ofthewayof-"lever 42-, which is then swung jioute of-the; Way Towards.- this; end, a toothed clutch disc isiengagedwith a cam .shaft. 1 .4; These operations are. accomplished 'during a licycle or!fullzrevolutionpf thecam shaft.- The almechanismsifor connecting the cam shaft with-' :thei-dri ve amotor -".af ter; a; record:;. has, been played ls-shown iinFigure 2.. Asa-record is- .played,=-tone ..The;--movement.; ofatone arme l5 ,isutilized for y cennectingfi thefi operating'i cam" shaft with the j drive--motor;:--hever.:=24 coupled-with tone; arm
, When 'a' f srec'ord. isrplayed; plates-2 5.2 -rotatedin: a clockwise -direction;:"Plate 125:-is in fr-lcti or 1al;.engage- V injturnarranged to actuate 'leverf .42centrally"pivoted at43: on'acam 44. Cani 44" {cam shaft 4'5automa'tica11'y changes a record and v outermost groove of newly positioned record. j I motorifdrlve is schematically indicated at 46.
whrh f as securedfthereto a toothedv clutch sectionflfl. ,Clutch section. 48 is engage-f ablewithzlug 5D of iever'42; :Spring 5| urgeslever.
free to follow the pull of spring 5|, coupling toothed clutch section 48 with cam 44. Since toothed clutch section 48 is continuously rotated by the drive motor 46; cam shaft 45 will be turned thereby. When cam shaft 45 has rotated through 360, lever 4| will have returned to its former po- 'sition-andagainst push lever. 42 against'the ac- :tion of spring'5l to interrupt the clutch driving .connection'betweenthe motor 46 and .cam shaft 10.4.5; I 5 The-automatic stopping-mechanism is initiated when the last-recordof the stack-of records supported on shoulder -|3'-"of-1 spindle |2 --ihas been droppedvon the turntable. -This =is accomplished in the-following manner. As shown in Figures 4 and 8. record steadying arm" 2| is provided with at biasing spring 52. .The other end of'spring 52 secured to pin 53 on standard I8. Spring 52 "as'a toggleaction;"When Jarm'. 2|-is in the open r moperative position of Figure 8; spring 52 exts' a pull to the left of "pivot-49 of arm 2|, holdin g' 'arm' 2| in the'inoperativeposition. After a stack o'f records is placed on'sp'indle l2, arm 2| s lowered-thereon to its position in Figure 5. Spring 52 then exerts'a'pullto-the right of pivot 49*a'n'd, therefore, tendsto pullarmli in the downward direction:
A pin -54-extending from arm: 2'|- engages the mounted -ini-standard 18. Pin 54"is arranged to 'j'u'st rest-upon head 5565 rod 56 -when in its upper position; as long as armZ-FiS- suxipdrtediby a recordonshoulder 3 -of'--spindl 'a |2 '-above the turntable. The lower end of woe 56- re its' upon other end 65 of lever 5"lhas a lateraLext'ending per ion engageable "j-with projection--fil-"otlever -52 -{Lever- 621s pivoted at B3-;-a'fol1o'we'r 65-being pivoted-thereonatfi ti Spring is arranged to 7*5-in afcounterclockwise"direction; f
*Bralgeflever 15f'h'as: a downwardly extending piirM-a'da'pbed obe'- engagedw-ith-rthe oblique "endf'portion 82 o orm'ecting rod 83" pivoted to stop s'tart' lever-ll4 top-start lever 841$ pivoted at 85 an'dfhas an actuating pin extending upwardly.'---'Actuating'pin llq'isadapted to be'operated by hand to stop and start the record changer andphoncgraph'.aswilljbefhiereinafter explained. Connecting 'ro'd83 e ent-out section 87 throughw-hich pinea -onleverflzprojects. Folan oblique cam-surface fQDatits end 9|." Cam surface QB'is mounted-for engagement by pro- .iectionon 9'2 ofcaml4'tf "1 The initla'ting'action' and subsequent actuation 7'0' of-the automatic stop: mechanism Willhow be explained. -When. the last record- R has been dropped f from shoulder l3 of" centering spindle l2, record steadying arm 2i=collapsesto"the position 2| shown in' dotted lines, one toth'e comhead 55 pfa verti'calro'd'SS'; -"-R0d 551s slidably' lever BflpiVotedat 5'8'as senin "Figure-4. The
draw lever "end 65- towards' follower' 65' 'vvhi'ch, in I lower 1ever65is shown-in Figures 4;6and 7', with,
blnod action offgravitr'andspring- 52;""fPin 54' placed thereby, and a l'ev'erflex-ibly coupled to 4. In an automatic electric motor driven -phonograph having means for stacking a plurality of records above the tumtable and means for successively releasing the records upon the turntable when a previous one has played: mecha nism for automatically stopping the operation of the phonograph when playing of the last stacked record is completed comprising an arm pivotally mounted to abut the last record of the stack to be played, and means coasting with said arm including a plunger, said plunger being arranged ior displacement by said arm when said last record is dropped from the stack; a motor for rotating the turntable; apparatus .engageable with said motor when the playing of each record is completed comprising a cam piece motivated with said apparatus when the apparatus is engaged with said motor, a part normally in the path of said cam piece and displaceable thereby, and a lever flexibly coupled -to said part; an element coactable with said plunger and having a portion normally abutting said lever to prevent its displacement; means connected between said portion and said plunger for moving said portion from the abutting position-upon displacement of said plunger by said arm, to permit displacement of said lever with said part; and a switch in circuital connection with said motor and actuated into circuit breaking position upon said displacement of said lever.
5. In an automatic electric motor driven phonograph having means for stacking-a plurality of records above the turntable and means for successively releasing the records upon the turntable when a previous one ha's'played: mechanism for automatically stopping the operation of the phonograph when'playing of'the last stacked record is completed comprising an arm pivotally escapes mounted above the records to abut-the last record rod and displacing said rod when said last record is dropped from the stack; a motor for rotating the turntable; apparatus engageable'with said motor when the playing of each record is completed comprising a cam piece motivated with said apparatus when the apparatus is engaged with said motor, a part normally in the path of saidcam piece and displacedthereby, and a lever spring coupled to said part; a' pivoted unit abutting'the lower end of said rod and having a portion normally abutting said lever to prevent its displacement, said portion being moved from the abutting position by said rod when said rod is depressed by said arm to permit displacement ofsaid .lever with said part; and a switch in circuital connection with said motor and actuated into circuit breaking position upon said displace ment of said lever to stop the operation of .the phonograph.
6. In an automatic motor driven phonograph having means for stacking a plurality of records above the turntable and means for successively releasing the records upon the turntable when a previous one has played: mechanism for automatically stopping the operation of the phonograph when playing of the last stacked record is completed comprising a member arranged to abut the last record of the stack to be played, a spring connected to said member to normally press it against the last record, means positively coacting with said member including an element, said element being displaced by the displacement of said member when the last record is dropped from the stack; a motor for rotating the turntable; cyclic apparatus engageable with said motor when the playing of each record is completed comprising a cam piece motivated with said apparatus when the apparatus is engaged with said motor, a part normally in the path of said cam piece and displacea'ble thereby, and a lever flexibly coupled to said part; means abutting said element and having a portion normally abutting said lever-to'prevent its displacement, said portion being moved from the abutting position when said element is displaced by said member permitting displacement of said lever with said part; and an instrumentality connected with said motor and actuated upon the displacement of said lever to stop "the operation of the phonograph.
.FRANCIS JOHN OFFEN.
US383018A 1941-03-12 1941-03-12 Automatic stop mechanism for magazine phonographs Expired - Lifetime US2295092A (en)

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Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2476715A (en) * 1942-08-15 1949-07-19 Svenska Aktiebolaget Philips Record changing device
US2511982A (en) * 1943-12-14 1950-06-20 Luxor Industri Ab Automatic mechanism for phonographs
US2523629A (en) * 1943-03-19 1950-09-26 Olsson Gunnar Daniel Electric phonograph
US2529438A (en) * 1950-11-07 Automatic magazine phonograph
US2529474A (en) * 1947-02-08 1950-11-07 Raytheon Mfg Co Automatic phonograph
US2545643A (en) * 1944-11-29 1951-03-20 Gen Instrument Corp Record changer phonograph
US2564455A (en) * 1945-07-30 1951-08-14 Raytheon Mfg Co Record changer
US2578378A (en) * 1945-08-30 1951-12-11 Raytheon Mfg Co Automatic stop mechanism for record changers
US2611619A (en) * 1948-05-15 1952-09-23 Rock Ola Mfg Corp Phonograph
US2614847A (en) * 1945-02-09 1952-10-21 Seeburg J P Corp Automatic phonograph
US2616703A (en) * 1947-10-14 1952-11-04 Arthur A Johnson Phonograph record changer
US2616705A (en) * 1946-10-12 1952-11-04 Arthur A Johnson Phonograph
US2637559A (en) * 1947-08-06 1953-05-05 Raytheon Mfg Co Automatic phonograph
US2640705A (en) * 1946-01-15 1953-06-02 Garrard Engineering & Mfg Comp Control means for phonographs
US2640702A (en) * 1946-04-26 1953-06-02 Gen Instrument Corp Tone arm positioning mechanism for automatic record changer phonographs
US2640703A (en) * 1948-10-13 1953-06-02 Dudley H Smith Record changer
US2643129A (en) * 1946-09-30 1953-06-23 Farnsworth Res Corp Record changing device
US2650831A (en) * 1947-06-27 1953-09-01 Gerrard Engineering & Mfg Comp Record changing mechanism for phonographs
US2657060A (en) * 1950-01-06 1953-10-27 Capehart Farnsworth Corp Change cycle control mechanism
US2718400A (en) * 1948-04-23 1955-09-20 Jr Harry C Jones Record-handling devices
US2781198A (en) * 1948-07-29 1957-02-12 Admiral Corp Phonograph record player spindle
US2803465A (en) * 1951-09-07 1957-08-20 Milwaukee Stamping Company Automatic phonograph with novel tone arm control
US2818263A (en) * 1951-02-27 1957-12-31 Webcor Inc Phonograph
US2868545A (en) * 1952-12-03 1959-01-13 Admiral Corp Phonograph record player control
US2984492A (en) * 1958-02-28 1961-05-16 Birmingham Sound Reproducers Disabling mechanism for automatic phonograph
US3014728A (en) * 1959-05-04 1961-12-26 Collaro Ltd Automatic record-changers
US3231282A (en) * 1962-04-18 1966-01-25 James T Dennis Record changer
US3279798A (en) * 1963-07-08 1966-10-18 Vm Corp Automatic shut-off mechanism for record changers

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2529438A (en) * 1950-11-07 Automatic magazine phonograph
US2476715A (en) * 1942-08-15 1949-07-19 Svenska Aktiebolaget Philips Record changing device
US2523629A (en) * 1943-03-19 1950-09-26 Olsson Gunnar Daniel Electric phonograph
US2511982A (en) * 1943-12-14 1950-06-20 Luxor Industri Ab Automatic mechanism for phonographs
US2545643A (en) * 1944-11-29 1951-03-20 Gen Instrument Corp Record changer phonograph
US2614847A (en) * 1945-02-09 1952-10-21 Seeburg J P Corp Automatic phonograph
US2564455A (en) * 1945-07-30 1951-08-14 Raytheon Mfg Co Record changer
US2578378A (en) * 1945-08-30 1951-12-11 Raytheon Mfg Co Automatic stop mechanism for record changers
US2640705A (en) * 1946-01-15 1953-06-02 Garrard Engineering & Mfg Comp Control means for phonographs
US2640702A (en) * 1946-04-26 1953-06-02 Gen Instrument Corp Tone arm positioning mechanism for automatic record changer phonographs
US2643129A (en) * 1946-09-30 1953-06-23 Farnsworth Res Corp Record changing device
US2616705A (en) * 1946-10-12 1952-11-04 Arthur A Johnson Phonograph
US2529474A (en) * 1947-02-08 1950-11-07 Raytheon Mfg Co Automatic phonograph
US2650831A (en) * 1947-06-27 1953-09-01 Gerrard Engineering & Mfg Comp Record changing mechanism for phonographs
US2637559A (en) * 1947-08-06 1953-05-05 Raytheon Mfg Co Automatic phonograph
US2616703A (en) * 1947-10-14 1952-11-04 Arthur A Johnson Phonograph record changer
US2718400A (en) * 1948-04-23 1955-09-20 Jr Harry C Jones Record-handling devices
US2611619A (en) * 1948-05-15 1952-09-23 Rock Ola Mfg Corp Phonograph
US2781198A (en) * 1948-07-29 1957-02-12 Admiral Corp Phonograph record player spindle
US2640703A (en) * 1948-10-13 1953-06-02 Dudley H Smith Record changer
US2657060A (en) * 1950-01-06 1953-10-27 Capehart Farnsworth Corp Change cycle control mechanism
US2818263A (en) * 1951-02-27 1957-12-31 Webcor Inc Phonograph
US2803465A (en) * 1951-09-07 1957-08-20 Milwaukee Stamping Company Automatic phonograph with novel tone arm control
US2868545A (en) * 1952-12-03 1959-01-13 Admiral Corp Phonograph record player control
US2984492A (en) * 1958-02-28 1961-05-16 Birmingham Sound Reproducers Disabling mechanism for automatic phonograph
US3014728A (en) * 1959-05-04 1961-12-26 Collaro Ltd Automatic record-changers
US3231282A (en) * 1962-04-18 1966-01-25 James T Dennis Record changer
US3279798A (en) * 1963-07-08 1966-10-18 Vm Corp Automatic shut-off mechanism for record changers

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