US1539460A - Phonograph stop - Google Patents

Description

May 26, 1925. '1,539,466

J. BRANDSTETTER PH'oNoGnAPH sToP Filed oct. 27. 1925l Patented May 26, 1925i.

'UNITED sit/sir'as Josua BRANDST'ETTER, 'o'r enferme, rrLiNo-s.

Application filed october' 27,1'1923. ser'iarivo. Brigate..

To all whom t may concern.'

Be it known that I, Josnr BRANDSTETTER, citizen lof the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented'certain new and useful Improvements in a -Phonograph Stop ,and l do hereby' declare the `following to be a full, clear, and exact description ci the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to a phonograph attachment for use with the class ot phonographs in which the reproducer is carried by a tone arm which swings over the record disk.

Generally speaking, my invention aims to provide an exceedingly simple, easily manipulated and inexpensive stop for this purpose; also one which can readilyfbe attached to previously completed or already installed phonographs, which will have the major portions of such a relatively low height as to be readily disposed below the turntable and to be largely concealed by the turntable; and one which can easily be adjusted so as to hasten or retard the stop action according to the amount of lost play and the extent of bending of various partsof the stop mechanism and of the phonograph portions operatively associated with the same.

More particularly, my invention provides a phonograph stop which can readily be attached to a standard type of phonograph Without requiring any alterations or machine work on the latter, which will have its trip arm operated directly by the swinging tone arm of the phonograph without requiring the attaching of any auxiliary parts to this tone arm, which can easily be manipulated for setting it according to the effective length of the record, and which can readily be adjusted with a high degree ot accuracy as to the point at which it stops the record.

Furthermore, my invention provides a phonograph stop in which the movement ot' the trip arm when adjusting the latter also tends to move the latching arm, in which the resulting movement causes the latching arm to exert a pressure on the brake arm, and in which the adjustment demanded'by variations in sizes and shapes of the parts and-the assembly of the latter is aitord'ed by an adjustable limit 'stop associated V'either with the lbrake arm or with the latching arm. -Still further and" also more detailed objects will appear lfromv the vfollowingspecification 'and from the accompanying' drawings, v"in Which- I Fig. ll' is a fragmentary plan 'view-of a phonograph, showing the tone arm and the reproducer as they appear to a person looking downward while standing behindthe phonograph, and showing the turntableland a record partly cutaway to disclose the position ot thestop embodying lmy invention, this stop being in its inoperative position as it appearsduring the playing of the record.

F ig. 2 is an enlarged plan View ofthe same stop, showing this as it appears when,

the latch hasbeen released so as to permit the spring to set thebrake and stop the turntable.

Fig. 8 is an enlarged and vertical section taken through Fig. 2 along the line 3-3 ot that iigure, with portions broken away toshow't'he relative disposition of various parts' when the latch has been released and the brake arm is inits operative position.l

Fig. 4 is a similar view taken when the latch"A is set so as to hold the brakev arm in its v,inoperative position. I

Fig. 5 is a somewhat diagrammatic elevation of parts of the same' embodiment showing the operation ofv the adjustment and the setting of the stop according to the length of thel record.

Fig; 6 is a similar view showing another arrangement of the adjustment, namely one in which the adjustable limiting member directly engages the la'tching lever.`

`In accomplishing the lpurposes of my in U vention according to' the illustrated embodiment, I provide as a supporting base a relatively thin horizontal'plate 1 land a brake arm? secured to this base plate2 by a vertical pivot pin Sand moving in a horizontal plane close to the top of the base plate. This brake arm has ahandle 4 piojecting beyond the normally' outward edge of the base plate. 'It also desirabl'y `has means engaging a portion of the base plate to limit the pivotal movement ofthe brake arm in one direction, such as a downwardlyv turned finger 3 moving in a slot 6` in the lbase plate and engaging one end of the slot when the brake arm is moved in that direction by'a tension spring? interposed between the brake'arm and afpost 8 fastened to the lbase plate. The brake arm also carries a brake 9 of leather or the like disposed forV engaging the interior of the usual downwardly turned flange .10 on the turntable 11 of the phonograph.

Pivoted to the base plate on a horizontal axis, suchY as that afforded by a pin 12, is a bell-crank'lever, comprising a latching arm 13 (which extends close to the top of the base plate)` and a riser arm 14. Thelatching armhas portions-thereof continuously underhanging the brake arm 2, and to permit of this while havin-g the brake arm close to the top of the base plate, Iprovide the base plate with a recess formation, such as a slot 15 into which this portion of the latchingl arm depends. Furthermore, this latchf.`

ing arm has an offset in: the same so as to afford` an upper face, 16 engaged by the brake Aarmgwhenthe latchxis released and the ,f brake is operative, and a v,relatively lower upper face 17 engaged by the brake arm when the latch isset so as to hold the brake inoperative, these two face portions 16 and 17 `being joined by a shoulder 18 which engages an edge poitio1i,19of.tlie brake arm whenvthe latch is set. To effect the setting of the latch, the handle 4 is manually moved in a direction which is counterclockwisein Figs. 1 and 2 so as to slide the brake arm iromthe position of Fig. v3 to that of Fig. 4, whereupon the vlatching arm is swungupwards as shown in Fig. athrough the operationv of a spring 20 vwhich continuously tends 5to swing the bell-crank lever in that direction. Y v

The riser arm 14 carries an upward exten sion in the form of a trip arm 21V which is pivoted to the riser arm through a friction j joint, 22and which extends upwardly into the path of the .tone arm 23 of the phono-Y graph,.so that (with therstop Amounted as in Fig. 1) the movement of the .tone'arm during the playing lof the record will cause this tone arm to engage the trip arm, thereby moving the bell-crank lever against lthe re-g sistance ofthe spring 20 and releasing the llatch so that the spring 7 can setthe brake. In setting the stop for `effective use with any particular record 24, the trip arm is iirstV swung far, out of its operative positionafter 'the manner shown in dotted lines .in Fig. 5,

this being done while the brake is iii its op- 'any parts and no springing of any parts,

but in practice these last named occurrences may make a difference of several revolutions rjustedVV positionv of Vthe limit finger. quently, by turning the screw 29 so as to adfjust the position of this iinger, I can vary .j ,139'

inthe record as to the actual time and pointv of the stopping. This isvtrue partly because there may be lost motion in the mounting of the tone arm and of the repioducer, partly'becauseof the diliculty of accurately'adjusting any friction joint, partly because of the springing of various parts of the stop,

and also because of possible variationsin thel exact lsize and assembly of the parts of my stop.

component ToV compensate iorsuch variations in the effective point of stopping,lI provide ad-v A justable means for limiting the swinging Y movement of the latching arm during` the above described setting ofthe stop, Vand dev sirably provide lthis adjustment so ythat it operates through the brakek arm andy also,V

serves tohold the latter continuously in a position close to thelatching arm. v- For this purpose, I preferably mount upon the base plate 1 an 4adjustable member 26 made of resilient metal and presenting a finger A27 which over-hangs the brake,v arm 2. V.This member 26 has one end rigidly fastened to Athebase plate by a -screw 28 while a screw.

2 9 extends into thebase platethrough a medial portion of this adjusting member so that the limit finger 27 Vcan be bentdown-.

wards more or lessaccording kto the tightening orloosening of this VAscrew 29. -v

In operating my stop, starting with the trip arm in the position shown iii dotted lines in Fig. 5, the tone arm .is so `disposed that the Aneedle ofthe reproducei' engages the portion of the record groove at which it yis desired to stop the needle. WVhen the trip arm 21 is then swuiigagainsttlie toneV arm as shown in full linesinFig. 5, the friction ofthe' joint 22 will tend to cause this move` ment of the trip arm to move the entire bellcrank or detent lever bodily. In doing4 so, the latching arm 13 the lever raises'the brake arm 2 until this brake arm is stopped by engagement with theflimit finger 27.

When thus stopped, the brake arm in turn acts as a` stop for the latching varm so that los.,

the vlatter can not be swuiigupward farther, 4 i

' and the bell-crank lever then remains stopped as a whole while the trip arm 21 may move von further so as to takeup any llost motion in vthe tone, arm and reproducer iiiountings. As soon as the fingerwhich trips the trip arm V21 against the tone arm is released, the

resiliency of the brake arm and of the limit i finger, both acting in'opposition to the lifting tendency ot' the spring 20, return the bell crank leverjto the position shown in Y Fig?) with the'trip arm. At the same time, the tone arm and reproducer will snap backto their former posi-tions, The trip arm 21 then extends at an angle to the latching arm which anglehas been determined by the ad- CoIlSei Y the effective angle -between the trip'finger and the latching member so as to compensate for the characteristics which would otherwise make the stop act either too soon or too late.

In practice I have found that even with the parts made of relatively thin stool; and with only a moderate care employed in assembling the parts, the adjustment provided in this manner is such that I can read-ily cause my appliance tostop the needle Within a small fraction of a Single rotation of the record from the 'point on the groove at which the reproducer needle was placed when setting the stop.

To keep the latching arm of the detent lever close to the edge of the turntable so as to permit my stop tobe used in phonographs where the space behind the turntable '2 is quite limited, I desirably curve this arm concentrically with the turntable after the manner shown in Fig. 2 and correspond ingly curve the slot entered by the free end portion of this arm so'as to guidethat portion. I also desirably form the ShOUldI portion 19 on the brake arm so that this shoulder will be radial of the said curvature when the brake arm is latched.

However, I do Lnot wish'to be limited to these or other details'of the construction and arrangement here disclosed, it'being obvious that the same might be modiied in many ways without departing either from the spirit of my invention orffrom the appended claims. For example, instead 'of having the limit member (here shownv as the linger 27) act on the latching arm through the intermediary of the'fbrake'arnnI can dispose this limit membervso that it will engage the latching arm directly, after the manner of Fig. 6. y However, I preferably employ the general 'arrangement of Figs. l. to 4 so that the limit finger will aid'm holding the brake arm close to the latching arm,

-- thereby permitting me to usea brake arm made of thin and somewhat resilient material While permitting ample clearancebetween the top of the brake arm and the limit finger vfor avoiding friction while the bra-lie is being released. t

In either case it will be obvious that by using a flat base plate and a brake arm swinging closely over it, I can secure an assembly of such a low height as to find room for it under the turntable of a standard phonograph, while the use of a detent member moving in a vertical plane permits the trip arm to extend directly into thepath of the tone arm, such a detent member being cheaply manufactured in the shapev of a bell-crank lever having offset face and shoulder portions as above' described. (Also,

since thetop of the base plate l will engage the latching arm of'thefdetent lever toliuit the movement'of the latter inf-.its releasing direction, I secure rmy said"advantagesfby adjusting the effective distance betweenfthe two limit stops `for 'the latching'orletent member.

, I claim as my inventiontl. A phonograph stop comprising a` supporting member, `a springLurged braken lfm and a latching lever pivoted to the supporting member on relatively transverse "ares and so arrangedthatthe brake arm llimits the movement I.of the latching .lever'jn one direction, and atri-p arm' connected 'tothe latching lever by a friction joint andso positi'oned that itfwill move the latching" lever in the-said direction when the tripa-rmis moved againstthe tone Tarm o'f the 'phono graph duringlthe setting of the lstop 2. In a phonograph stop, a brake army pivoted for.` movement inv a horizontal plane, and a detent member pivoted for move-nent in a vertical plane, the detent member h w' ing an arm disposed in the path ofthe tone arm of the phonograph and havin'gfjanother arm disposed 4for '-latcliing'the brake arm, the said other arm being curved concentric withv the pivoting aXisof the Vbrake arm.

3. In `a phonograph stop, a brafkearm pivotedfor movement in a horizontalxplane, and a detent member pivotedfor movement in a vertical plane, the detent membenhaving one arm disposed in the patli'of the tone arm of the phonograph and having anothc" arm disposedfor latching the brake arm, the said other rarm being curved concentric .vith'the'pivoting axis ofthe braker arm, the portion 'of the fbr'alre arm which-` is vengaged by the said other arm of the detentmember' being.- radial of the said pivoting axis.

4. In a phonograph stop, a vbrake arm pivoted for movement ina horizontal plane, and adetent member pivoted-'for Amovement in a vertical plane, the det-ent member having an arm disposed in the path of the tonearin of the phonographl and having another arm disposed/for latching the brake'arm, and a supportto which the brake'ar'm anddetent memberare pivoted, the support having Va base provided with alslot in which yaipar't of the 'said other armo'fthe detentim'emb'er moves. l w i v g 5. 'In a phonograph stop, a brake arm pivoted for movementina yhorizontal plane,` and a detent member .pivoted for movement in a vertical plane, the detent member having an `arm disposedin `the, path' ofthe "tone arm ofthe vphonograph and yhavingyanother arm disposed for latching the brake 'armT y and a support-to-which the brake'iarm and detent member .are pivoted',l the:- support having a base provided witha slotin which? av part of thesai'd-` otherarm `of Atliedetent member moves and havinga. portionadapted to engage the said other armto limitthev movementof `the detent member in' one di-r rection` i v justing of the trip 6. A phonograph stop comprising a substantially horizontal base, a detent arm pivoted theretoion a `horizontal axis and having a portion adapted to rest upon the top of the base and a continuation portion of lesserl height, a brake arm pivoted to the base on a vertical` axis and having its lower face` substantially in the plane of the upper edge of the first named detent arm portion when this portion is resting on the top of the base, the juncture of the said two arm portions affording a shoulder for engaging the brake arm'wh'en the detent arm is raised off its said restingdisposition, a spring urging j the brake arm toward the pivot of thede- 4 portion of the base below the brake arm.

8. VA stop fora phonograph, comprising a brake arm pivoted for movement in a horizontal plane, a spring continuously tending to move the brake arm to its brak-4 ing position, a detent lever pivoted. for

movement in a vertical plane and adapted to holdthe bra-ke arm- `in an inoperative position, and a trip arm pivoted to thedetent lever by a friction joint and disposed` in the vpath of the tone arin ofthe phonograph;

the brakel armbeing arranged to swing over an arm of the detent lever when the brake is set, so that the engagement of the detent lever with the brake arm will prevent the detent lever from4 moving in one ,direction about its pivotal Vmounting during the adarm about the friction joint.

k9..A stop for'a phonograph, comprising.

a brake armvpivoted for movement in a horizontal plane, a spring continuously tending to move vthe brake arm to its braking position, a detent lever pivoted for mOVementina vertical.: plane and having one arm adapted to holdthe brake arm in .an-,inoperative position, and a trip arm pivoted to the detent lever by .a'friction joint and disposed in the Apath` of the tone armof the phonograph, .the brake arm being disposed for stopping the pivotal movement of the other arm of the ydetent lever towards the tone arm. f

10. A stop for a phonograph, comprising a brake arm pivoted for movement in a horizontal plane, a spring lcontinuously tending to move the brake arm to its braking position, a detent lever pivoted for movement in a vertical plane and adapted tog` hold the brake arm in an inoperativek position,V anda trip arm pivoted to the detent lever .by a

rictionjoint and disposed in the path of the tone arm of the phonograph, the detenty lever `having a portion underhanging the brake arm when the brake is latched in its inoperative position and having another portion underhanging the brake arm when the brake is set. j i l l e 11.'A stop for a phonograph, comprising a brake arm pivoted for movement ina hori'- zontal plane, a spring continuouslytending to move the brakearm to its; braking position, a detent lever pivoted 'for movement in 'a vertical plane and adapted to hold the brake arm in an inoperative position, and

a friction joint and disposed in the path of the tone arm of the phonograph, the brake arm being disposed for stopping thepivotal movement of the detent lever in one direc-V tion, a spring continuously tending to move 4 the detent arm in the `said direction, and a stop-for. limiting the lifting ofthe brake arm by the detent lever. H

l2. A stop for a phonograph, comprising` u a brake arm pivoted fory movement in a hori-vv zontalplane, a spring-continuously tending Y to move the4 brake arm to its braking position, a latching lever -p'ivoted for movement Y in a vertical plane and adapted yto hold the brake arm in an inoperative position, and a trip arm pivotedto the latching Vlever by'a friction joint and' disposed in the path of the tone arm of the phonograph,A the brake arm being disposedV for stopping `the pivotal movement of the latching lever in one direction, and a pair of stops for limiting the movement of the detentfarin in respectively'opposite directions.g

l13. vA .stop for a phonograph, comprising a brake armrpivoted for movement in a horizontal plane, a spring 'continuously tending to move the brake-arm to its braki to hold the brake armin an inoperativeposition, and a trip arm pivoted to the latching lever by a .friction joint and disposed in the path of the tone arm of the phonograph, the-brake arm being disposed for stopping the pivotal movement of theflatching lever in' onedirection, a pair voi'rstops for limitingV the movementofthe latchingv` Y ing position, Va latchinglever pivotedfor movement in a vertical plane and adapted lever in respectively opposite directions,

and means for adjusting the efectivedistance between thestops. I

PLA stop for a phonograph, comprisingVV a brake arm pivoted for kmovement in a horizontal plane, a spring continuously; tending to move the brake arm to itsy braking position, a latching .lever ,pivoted for movement in a vertical plane and adapted.

to hold the brake arm inv an inoperative position, and a' trip arm. ivotedto the'latch-VV Y ing lever by a friction joint and disposed in 0 the path. of the Ltone arm of the phonograph,

a trip arm pivoted to the detent llever by S0 -i the latching lever having a portion underhanging the brake arm When the brake is latched in its inoperative position and having another portion nnderhanging the brake arm when the brake is set, the juncture ol the said two detent arm portions forming a shoulder for engaging the brake arm.

l5. A phonograph stop Comprising as one member a spring-actuated pivoted brake arm, and as another member a lever having a latchng arm underhanging the brake arm; and a trip arm mounted on the lever and disposed in the path of the tone arm of the phonograph, the trip arm being adjustable in position with respect to the latching arm and being adapted to be moved againstV the said tone arm to adjust the stop, the arrangement being such that the said move-v ment of the trip arm against the tone arm also moves the said lever in one direction; and adjustable means associated with one of the lirst named two members for limiting the movement of the detent lever in the said direction.

Signed at Chicago, Illinois, Oct. 20th, 1923.

Josnr BRANDsTnT'rER.

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