US1704063A - Automatic stop mechanism for phonographs - Google Patents

Description

March 5, 1929.

1'. 1.. SCHOWENGERDT AUTOMATIC STOP MECHANISM FOR PHONOGRAPHS Filed April 16. 1928 2 sheeyysneet 1 Inventor March 5, 1929. r. L. SCHOWENGERDT AUTOMATIC STOP MECHANISM FOR PHONOGRAPHS Filed April 16, 1928 2 Sheets-Sheet [Ill/l Il/l/ I4 Inventor [I Joawe/yera f 1 I JWW ttorng Patented Brian 5, 19229.

were srras THEODORE LOUIS SCHOVJEIIGERDT,YOF GEBO, WYOMING AUTOMATIC s'ror mncnanrsm non rnonoonnrns."

Application filed April 16,

The present invention relates to improve ments instop mechanisms for phonographs and has for its principal object to provide a means for efficiently stopping the turn table of the phonograph after the reproducer carried bythe tone arm has traversed the record supported on the turn table. One of the important objects of the present inventionis to provide a stop mechanism for phonographs that can be readily and easily installed without necessitating any material alterations of the parts of the phonograph with which said stop mechanism is adapted to be associated, additional means being provided for setting the stop mechanism depending, upon the particular character of record that is played on the phonograph. A

further object is to provide a stop mechanism for phonographs off the above mentioned character whereby the brake can bcbrought into en gagement'with the rotatable turn table without causing any injury or disruption of the parts of the stop mechanism that operate automatically. Still a further object to provide a stop mechanism which is simple in construction, inexpensive, strong and durable and further well adapted to the purpose for which it is designed. Other objects and adi' antages of the invention will become apparent from the following description when taken in connection. with the accompanying drawings. V

In the accompanying drawings wherein like reference characters indicate corresponding parts throughout the several views: v t

Figure 1 is a "fragmentary top plan view of the rotatable turn table of a'phonograph, showing my improved stop mechanism that is arranged beneath the turn table.

Figure 2 is a sectional view taken approxin'iately on the line 2-2 of l igure 1 showing the stop mechanism in side elevation.

Figure 3 is a detail perspective view of the L-shaped member that cooperates with the depending 'pin carried by the movable tonev arm. 7 I

Figure it is a detail perspective view of the pivoted lever forming a part of the stop mechanism.

Figure 5 is a similar view of the brake. unit, and

192s. Serial 1%. 270,321.

Figure 6 is a detail perspective view the trip and the ad ustmg rod therefor. i

In the drawings wherein for the purpose of illustration is shown thepreferred embodiment of my invention, the numeral 1 designates a portion of the rotatable turn table of a phonograph that is mounted in spaced relation upon a suitable support 25 the record engaging pin 8 extending upwardly from the support through the turntable in the n'ianner as clearly shown in the drawing. 7

mediate portion of this arm is bent upwardly as at 1Q so that the outerend' portion of this arm will be disposed above the planeof the inner endportion oi said arm and as is clearly shown in Figures 1 and 3 of the draw ings, the outer end of this arm is formed with a longitudinally extending slot 11 to receive the lower end of the depending pin 6 carried by the movable tone arm 5. Thus the L-shaped member Twill be adapted for simultaneous movement with the tone arm 5 and the reproducer carried thereby.

An elongated flat rod 12 is secured atits inner end on the upper face of the support 2 adjacent the center of the turn table as at 13, and this red or arm 12 carries at its outer end a cross piece 14, the outer longitudinal edgcot' which is formed with the ratchet teeth 15 as clearly shown in Figure 1, The nier cnd of the pivoted rod 12 terminates inwardly of the flanged outer edge ofthe turn table 1. An elongated link 16 afiords an operative connection between the outer end of the shorter arm 17 of the pivoted L- shaped member 7 and 18 that is formed at its inner end with a E 9(- mental head portion 19 for disposition lie-- neath the turn table 1 adjacent the outer flanged edge thereof, and this lever is pivoted at its inner end on the support 2, as at 2() The outer end portion of the lever is disposed upwardly and thence laterally to form a handle 21 that is arranged exterioriy of the turn table and a longitudinally eE-Itend ng slot is formed in the handle portion 21 for a purpose hereinafter to be more fully eescrihcd. The curved edge of the segmental head 19 is formed with the teeth 23 that engage with the teeth 24 formed in the curved edge of the segmental inner end portion of the brake carrying plate 26 and this plate is also pivotally supported at its inner end on the support 2 as at 27. A brake element- 28 is carried by the outer end of his plate 26 for cooperation with the inner face of the annular flange 4: that depends from the outer edge of the retatable turn table 1 and the specific construction of the brake unit is more clearly illus trated in Figure of the drawings. A slot 29 of arcuate formation is formed in the segmental head portion of this plate 26 and extenoing upwardly through this slot from the support 2 is a pin 30. A spring 81 is socured at one end to the upper end of the pin. 30 and at its other end to the intermediate portion of the plate 26 for normally holding the brake element 28 inwardly and out of engagement with respect to the flange 4 of the turn table 1.

A lateral extension 32 is formed on the inner edge of the plate 26 adjacent the segmental head and carried by this extension is the pivoted pawl 33, the same being pivoted intermediate its ends and the inner end of this pawl is adapted for cooperation with the ratchet teeth 15 formed in the outer longitudinal ed .ge of the cross member 1 1- arranged on the outc end of the pivoted rod 12., A hravy leaf spring 8 1 is arranged on the plate 26 for en en gement with the outer end of the pivoted phwl on one side thereof. a lighter spring 85 being disposed on the opposite side of the )ivoted pawl as shown very clearly in Figure 5.

The springs cooperate to prevent any injury or disruption of the parts of the stop ineirhanisni should the operator forcibly ar tuate the bifilii mechanism by hand the purpose of l he light spring being to maintain the pivoted pawl in operative rela ion with "e spect to the heavy spring "l L-shaped trip member designated generally by the numeral 2-35 is pivoted at the pmcture of the longer arm with the shorter arm on the segmental head 19 of the lever 18 the longer arm 37 extending inwardly and, being adapted for cooperation with one end of the toothed cross member 14 on the outer end of the pivot ed bar 12. The shorter arm 38 of this L-shapedtrip 36 is pivotally secured to the inner end of a rod 39 that extends along the upper face of the inner end portion of the pivoted lever 18, the outer portion of this rod being slidable through the vertically disposed portion of the lever through a suitable opening provided therefor in said vertical portion. As is more clearly illustrated in Figure 8 the outer end of this rodBS) is bent upwardly and the upwardly disposed outer end portion of the rod is designated by the numeral 40. The upwardly disposed portion 40 extends through the slot 22 formed in outer end portion of the pivoted lever 18 and threaded on the outer extremity of this portion of the rod is a head ll that is adapted for slidable movement along the upper face of the outer end portion of the lever.

A spring 42 encircles the upwardly disposed outer end portion -11) of the rod 39 and is disposed between said rod and the bottom of the handle portion 21 of the lever 18 for holding the head 11 against casual sliding movement and furthermore by tightening the head 41 sothat the same will be maintained in locked engagement with the handle portion 21 of the lever 18, the trip member 36 may be adjusted with respect to the cross member let on the outer end of the pivoted bar 12. The operation of my stop mechanism may be briefly stated as follows. With the parts arranged shown in Figure 1 of the drawings it will be. readily obvious that the Lshaped member 7 pivot 8 simultaneously with the movement of the tone arm 5 across the record that is being played and during the swinging movement of the L-shaped member 7 in the direction indicated by the arrow, the pivoted bar 12 will move in the direction indicated by the arrow in Figure 1 so that the end of the cross member 19 that is in engagement with the free end portion of the longer arm 32? of the L-sliaped trip 36 will swing the lever 18 on its pivot 20 and the teeth 2301" the segmental head 19 will cooperate with the teeth 24 of the segmental that forms a part of the brake unit to swing the plate outyardly whereby to bring the brake element 28 into engagement with the inner face of the depending flange .4: formed at the outer edge of the turn table 1 whereby said turn table will be brought to a stop, the stopping of the turn tabla occurring when the reproducer not shown) tone arm has reached the innermost 511'0012 of the record that is supported on the turn table. The sett'ng' of the stop mechanism to eiiect the actuation of the brake may be regulated by moving the head. 4:1 inwardly along the handle portion 21 so as to actuate the rod 39 and the latter will in turn move the llsshaped trip member '36 to a predetermined position for cooperation with the cross member 14 carried by the outer end of the pivoted bar 12. In this manner the stop mechanism will swing on its a that carried hy the movable 1 ciated.

can housed in conjunction with theplaying of records or differentmakes and sizes. I The spring 31 will at all times under normal conditions hold the brakeelement 28 in an inoperative position and the parts will be returned to their normal positions when the tone arm 5 is swung outwardly to the outer edge portion or the turn table prior to the playingof the record that is placed on the rotatable turn table. The stop mechanism is initially set by swinging the tone arm inwardly whereby to move the arm or bar 132 to the iosition where it will strike the trip 36 after which the trip is moved part the way back to its proper position. It will thus be seen from the foregoing description that I have provided a stop mechanism for phonographs which will at all times be' positiveand e'tlicient in its operation and due to its simplicity the stop mechanism can be readily and easily attached to various types of phonographs without necessitating any material alterations of the parts of the phonograph with which the stop mechanism is to be assolVhilc I have shown the preferred embodiment of my invention it is to be understood that minor changes may be made therein without departing from thespirit of the invention and the scope of the appended claims.

Having thus described the invention, what I claim as new is 1. The combination with a phonograph having a turn table, and a tone arm for movement across the turn table; of a stop mechanism for stopping the turn table, said stop mechanism including a pivoted brake unit arranged adjacent the outer edge portion of the turn table and being normally held out of engagement therewith, a lever pivoted adjacent the pivoted brake unit and being operatively connected therewith for simultaneous movement, a trip carried by the pivoted lever tor actuating the same, means operable by the tone arm for actuating the trip and movethe brake unit into an operative position, said mentioned means comprising an L-shaped member pivotally supported beneath the turn table, the outer end of the 7 longer arm ot said L-shaped member extendhaving a turn table, and a tone arm for move ment across the turn table; of astop mechanism for stopping the turn table, said stop mechanism including a pivoted brake unit arranged adjacent the outeredge portion of the turntable and being normally held out or position, means carried by said lever for setting the trip, said means including a manually adjustable rod arranged on thelever,said trip including an L 'sliaped member that ispivoted on the lever, the inner end of the lever being operatively connected with one of the arms of said L-shaped trip.

3. The combination with a phonograph having a turn table, and a tone arm adapted to move across the turntable; of a stop mechanism for stopping the turn table, including a pivoted brake unit arranged adjacent the outer edge portion of the turn table, aturn' table engaging brake element carried by the unit and normally held out oi? engagement with the turntable, a lever pivoted adjacent said unit, the adjacent portions of the brake unit and the lever being formed with toothed segmental head portions that engage with each other to effect the simultaneous move. ment of said pivoted members, an adjustable trip member carried by the pivoted lever for actuating the latter, means operable by the tone arm for actuating said trip and move the brake element into an operative position, I said last mentioned means including a bar pivoted at its inner end beneath the turn table,

the outer end of said bar being in engagement with the trip, and L-shaped member pivoted beneath the turn table, the outer end of the longer arm of the said Lsshaped men'rber extending beyond the outer edge of the turn table and being operatively connected with the movable tone arm, and a link operatively connecting the shorter arm of the L-shaped member with the pivoted end of the bar.

4;. The combination with a phonograph having a turn table, and a tone arm adapted to move across the turn table; of a stop mechanism for stopping theturn table, including a pivoted brake unit arranged adjacent the outer edge portion of the turn table, a turn table engaging brake element carried by the unit and normally held out of engagement with the turn table, a lever pivoted adjacent said unit, the adjacent portions of the brake unit and the lever being formed withthe toothed segmental head portions that engage with each other to effect the simultaneous movement of said pivoted members, an adjustable trip member carried by the pivoted lever for actuating the latter, means operable by the tone arm for actuating said trip and move the brake element into an operative position, said last mentioned means including a barpivoted at its inner end beneath the'turn table, the outer end of said bar being in engagement with the trip, and an L-shaped member pivoted beneath the turn table the outer end or" thelonger arm of the said shaped member extending beyond the outer edge of the turn table and being operatively connected with the movable tone arni a link operatively connecting the shorter arm of the L-shaped member with the pivoted end of the bar and means for manually setting the trip to regulate the movementof the brake element to an operative position.

In testimony whereof I affix my signature.

THEODORE LOUIS SCHOWENGERDT.

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