US1141037A - Stop for tone-arms of talking-machines. - Google Patents

Description

narran sanrns raanur `rauen GERHARD BUSCH, 0F PHILADELPHIA, PENNSYLVANIA.

STOP FOB TONE-ARMS GF TALKING-MACHINES.

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arm, will strike said disk immediately adjacent the beginning of the record thereon. A further object of the invention is to provide a stop which will limit the movement of the tone arm to such a point as will cause the reproducer needle carried thereby to engage the' record disk between the edge and the beginning of the record groove with a view to preventing moved into a position in which the needle may drop beyond the edge of the record, ash

well as to avoid the loss of time otherwise incidental in properly starting the talking machine.

The invention also contemplates a novel form of a stop for the tone arm of the talking machine which shall be adjustable to cause it to properly position such arm for records of a number of di'erent diameters and that re ardless of whether said tone arm is mova le solely in a horizontal plane or Whether it is moved in both horizontal and vertical planes while being brought to a 40 position in which the machine is ready for opera-tion.. l

Another object of the invention is to provide a device of the character descrlbed -which in addition to being adjustable to suit it to tonearms of various heights above thel surface of fthe talking machine casing, shall Valsoinclude means whereby its arm-engaging abutment or abutments may be conveniently` adjustable to cause them to stop such armv with the reproducer needle int e desired position relatively to arecord disk.

yThese objects and other advantageous ends I secure as hereinafter set forth, reference being had to the accompanying draws in Which:-

igure 1 is a plan of a portion of a talk- Speccation of Letters Patent.

Application. led August 10, 1914. Serial No. 856,019.

beyond that point at which thev :reproducer-l needle, carried by the sound box on. saidv the sound box beingV Patented May 25,' i915.

ing machine showing my vinvention as applied thereto; Fig. 2 is a detached erspective View of certain of the parts o my invention; Fi 3 is a side elevation of a slightly modified form of my stop, and Fig. 4 is a sideA elevation of a special form of arm engaging member.

In the above drawings 1 represents the top of the casing df a talking machine of the well known form upon which is mounted a rotary plate 2, driven from a vertical spindle 3 inthe ordinary manner. lOn this plate may be placed record disks yof any diameter, the customary sizes being either twelve inch'or ten inch disks, as illustrated at 4 and 5 respectively.' The tone arm of the machine is indicated at 6 and in the present v case is shown as mounted on a vertical-pivot 7 so as to swing in a substantially horizontalv plane, the' sound box 8 bein attached to the free end of said arm throug a cose-neck 9.

Said' sound box is provided vwith a record engagingv needle or point 10 and my invention is designed to insure that,v when the tone arm is swung outwardlyA prior to bringing the needle lnto vengagement with the` record, 'said arm shall be stopped/at the eX- act position necessary to cause the point of the needlel() to engage. the record 5 for. example, at some point between its edge and the beginning of therecord .groove in its surface. For this purposeI mount on the top surface of the machine: casing adjacentthe plate 2 arsmall base 11, having a socket'12' for the reception of a vertically extending rod 1 3, which may bev adjustably clamped 1n place by a set screwvl/l. On the upper end ofthe standard so formed is lixed 'a circular or other suitablyl shaped plate 15 'upon which is rotatably mounted a second plate or .disk'l held in place by a pivot kscrew 17.

.In the present case have illustrated my invention as designed for use in limiting the 'tone arm to either 'of two outer positions in which its soundrbox point or needle will be properlypositioned on a ten or twelve inch record, as the case may be and I therefore mount on the top surface ofthe plate 16, two binding posts 18 and 19, which are providedwith clamping screws 18l and 19,a respectively. In said binding posts areA ad justably mounted two4 small horizontally projecting rods 20 and 20a each having ka cupped head 21 in which is mounted a rub-,.

ber or other suitable buffer 22, the arrange-n i ment being` such thateach of saidrods" may ronieach other., and thedisk 16 likewise' has a similar vertical notch. there beingv fixed to the edge ot this latter disk a` spring pawl 26, hooked at its free end sons toinormally extend intothe notch The width of thishoolied end is such that it extends` below the plane oi the bottom face oir the disk 16 and when the parts are assembled..

is free to enter either ot' the notchcs'Qi or 24. The adjacent ends ofthe two notches 23 and 2l are slightly .beveled or ,curvedy 4so that when a suflicient rotary i'orcc is exerted, the plate 16 is turned, whereupon. one ot' these beveled or curved edges will act on the. hooked end of thepawl 26`to raise it out of` the notch 2ans well as that oneof the notches in the plate 15 which may have been in line witlithe same. The platey 16 may then be freely turned uutilthe second notch comes under the hooked end of the-pawl which. will at oncel enter it and hold. the

plates from relative movement until. the

plate -16 is again forcibly turned.

Inusing the device, the'base 11 is permanently fixed to the top of the casing 1 in or adjacent `the position shown in Fig. 1 relatively to the tone -arm and record supporting plate, and the post 13 is thereafter adjusted vertically so as to bring thejcente'r line ofthe bars 2O and ZOELsupported by the two binding posts, into the same horizontalplane as that of the tone arm' 6. This latter is then brought to a position in which, when the sound box is lowered, the needle 10 engages the ten inch record 5 at somepoint 'on .Y

the narrow annular surface between its periphery and the beginning ofA its record groove, after which the `longer of the tivo arms 2O and- QO, i'. 6., that belonging to' the binging post 18, is moved outwardlyfuntil its rubber end portion or buffer engagesthe tone arm, whereupon the set screw 19 is tightened. The plate 1'6 isl then turned on its pivot screw17 through anangle of' sub-" stantially 90, thus bringing the stop rod 20 into a line perpendicular with the center line of the tone arm, which isthen moved to a position in which the needle or repro'- ducer 'point 10, engages the narrow annular edge'portion of the twelve in eh record 4,'

between its edge and the beginning of the record groove thereon.; Thereafter this second rod is moved longitudinally through its` binding post until it engages the tone arm,-

when its screw 19" is tightened to :clamp it rigidly in position. Ifvnow. the'machine is to be usedwith 95 twelve `inch records, it is only necessary in (to the tone arm 6 by any suitable form lbaud clamp4 32,'l i When. the tone arm 1s swungjon its pivot, that one of the rods 20 I preferably lmake each of the orderhtoplaceit in operation that` the tone arm-be swung o'utivardly until itengages the fbuiier `on the rod )O carried on the bind- .ingpost 19. 'Thereafter the 4goose-neck '9 may be rotated in its bearing to lower the 'sound box S:,"and"`by reason ot' the above noted positioning operation, thev needle 10 will engage the disk 4 in a position ready to enter the record groove thereof, but withouty the possibility of moving outwardly oil' ol the edge.

. When it ldesiredto vuse the machine with .ten inch records, the plate16 is turned on its pivot scro\\'.1'i',4 thus bringing the longer f so, b v the tonearm, when this 1s `swim .out,.`

bar or rod 2t) into position to be engaged wai-diy. When it stops, the soundv ox 8.

may be lowered, and as before the needle or reproducer point 10 will engage thel dlsk@ at some pointbetween its edge andthe bev ginni'ng of the record groove.. `ln any Ic ase it is a Apractical impossibility Afor thesouinil 'j box to be lowered so thaty the needle willfall sequent Apossible injury. lVhenthe plate .16

bars 2Q or Q0 int operatii'e posi tion,thev

,hooked end ofI thevspring 26 ishforced out of `.that one of the not'chesZS-and'A in which it wasresting and ridesoverthe curved edge I'` is turned to bring one mythe otherof the f of said'plate untilit finally dropsintothe Votherbneotithesefnotchesand'into the `notch Q5 o f. the plate 16, thuslocking one of mi.

said rods in working position readv to limit the movcmentof the tonev arm. l Obviously the adjustable stop rods 20 or 20 may be mounted on -thetone ar m.itse lf,

`in which case, as shown in Fig. 3, I mount on the top' .of the casing 1 a vertical stand- Q ard 30, carried by a base 31, fixed to saidtop.

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As before, the rod or rods Q0 and Q0 are adjustably'carried on a rotatable plate 16, pivotcd concentricallywith the second plate or disk 15" which .in this ease would be clamped? coperate with the standard 30 to, limit the position ot' the sound box as previously de vwhich projects' at right angles thereto will y scribed and therefore also the position of the needle or pointy 10.

'InA those forms of talking machines lin which the tone arm is vertically movable as well as free to swing `in a horizontal plane,

limiting rods as shown in Fig. "4.` In this construction the outer end o f each roti 1s `verticailyelongated both abete' and below.`

its center line as indicated ad 33 and is pro` vided with "a leather, rubber or other relay tively sd-it I'facing 34'; W'ith this' construction the tone arm is engaged and its movement limited vwhen it is swung outwardly so, that bv the time' the sound boxis lowered tone arm 'a plurality of arms projecting diiferent distances from said member; with a pawl carried by the standard in position to engage the rotary member for temporarily locking it in any of a number of diierent positions.

2. A new article of manufacture consisting of a standard; a plate ixed thereon; a second plate parallel with the first plate and free torotate relatively thereto; a plurality of binding posts carried by the second plate; with arms mounted in said binding posts and projecting different distances at right angles to the standard.

3. A new article of manufacture consisting of a. standard; a plate fixed thereon; a second plate parallel with the iirst plate and free to rotate relatively thereto; a plurality 'of binding postsearried by the second plate;

arms mounted in said binding posts and projecting different distances at right angles to the standard; and a spring actuated pawl carried by one of the plates and formed to cooperate with any of a plurality of notches in the other plate to temporarily lock the arms in diii'erent positions relatively to the standard.

4:. A new article of manufacture consisting of a supporting structure; a plate rotan -table thereon; arms projecting from said plate in lines substantially at right angles to the axis of rotation thereof; buffers respectively carried by said arms; and a pawl mounted on the supporting structure in position to engage and hold the plate in any of a plurality of definite positions.

In testimony whereof, l have signed my name to this specification, in the presence of two subscribing witnesses.

GERHARD BUSCH. Witnesses:

AUGUSTUS B. Gorras, dos. H. Kram.,

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