US1486859A - Stop for phonographs - Google Patents

Description

March 18 1924.

B. B- BLOOD STOP FOR PHONOGRAPHS Filed 0ct.. 21 1920' Patented Mar. l 192d.

Bean 3. BLOOD, or cnronco, iLLrne-rs,

hath

nssienoa, BY ransnn Assron niirs, 'ro

ILLINOIS.

s'ror roa riionoenarns.

Application filed October 21, 1920. ,Serial No. 418,446.

To all whom it may concern:

Be it known that I, BURR B. BLooD, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and usei'ul Improvements in Stops for Phonographs, of which the following is a description, reference being had to the accompanying drawing, which forms part of my specification.

My invention has for its object the provision of a construction which is simple in operation; inexpensive in construction and which can be readily applied to phonographs for the purpose of automatically arresting the rotation of the turn-table when the tonearm of the phonograph has reached a predetermined point in its lateral oscillation transversely of the record of the turn-table.

The purpose of my invention is to provide a device which may be attached on top of the motor-board of the phonograph-cabinet at a point adjacent to the turn-table without necessitating any reconstruction of the phonograph mechanism or the addition or attachment of any mechanism to the tonearm of the phonograph. 7

One object of my invention is to provide a stop which will not only be automatic in so far as the application of the brake or stopping element is concerned when the tone-arm reaches a predetermined point in its travel, but which will also be automatically set in tripping position when the brake or stopping member is moved out oi braking relation with the turn-table; the tripping element of the device permitting of such nice adjustment that actuation of the bralre element or stop will positively be induced when the tone-arm has reached a predetermined point in its transverse travel, thus adapting the device to varying sized records; the con struction being such that the stop may be accurately adjusted to any record without incurring any lost motion or excess rota tion of the turn-table.

The objects and advantages of my invention will be more readily comprehended from a detailed description of the accompanying drawing, wherein Figure 1 is a plan view of the sound con-v veyor or tone-arm and a reproducer attached thereto, and also of my improved stop which with a record thereon, being shown.

Figure 2 is a side elevation of my improved. stop with certain portions shown broken away.

Figure 3 is a plan view thereof illustrating the stop in released or brakingposition.

Figure 4 is a plan view of the same showing the stop in set or non-braking position.

in the particular exemplification of the invention as disclosed in Figure 1, my improved stop device is shown applied on top of the motor-board of a phonograph ata point adjacent to the turn-table on which the usual disc or record is placed so as to be traversed by the sound-box or reproducer 11 secured to the outer end of the sound conveyor 0i: tone-arm 12 which is oscillatingly mounted at its base, in a well known manner, on the motor-board of the phonograph cabinet so as to permit oscillatory movement of the tone-arm or sound conveyor from the initial or starting point, indicated in dotted lines, to thermal or stopping point adjacent the center of the turn-table indicated in full lines.

The device comprises a suitable base plate 13 adapted to be secured flush with the motor-board in any suitable manner, as for example by screws as at 14; the base plate being arranged at a point in proximity to the turn-table and the base or swiveled point of the tone-arm as shown in Figure}, so that the brake-shoe or lug 15 of the brakelever 16 may come into frictional contact with the periphery of the turn-table. The brake-lever 16 is pivotally mounted at 17 on the base plate 13 and is provided with a hand lever portion 18 whereby the brakelever may bemoved into releasing position. The brake-lever is automatically moved into braking position, when released, by means of a suitable spring 19; one end whereof is shown secured to a suitable lug or pin 20 on the base plate 13, while the other end of the spring is secured to a lug 21 arranged on the brake-lever at a point intermediate of the pivotal point 17 of the lever-and the brake-shoe or end 15 thereof; the spring exerting a constant pull on the brake-lever so as to move the same into the braking position indicated in Figure 3 when the tripping circle concentric with that described by the arcuate finger 22, so as to permit the sliding relation of end 24 within the are described by arcuate finger 22. The arcuate end 24 is maintained in intimate relation with the arcuate finger 22 (when the brake is in released position) by a suitable lug 26 disposed upwardly from base plate 13. The trip member 25 is shown secured to the lower end of a tube or sleeve 27 so as to oscillate therewith and the tube or sleeve 27 in turn is arranged in frictional contact about the vertically disposed crank-shaped rod 28, which, at a pointabove the top of the sleeve or tube 27 is disposed horizontally so as to extend beneath the sound-conveyor or tonearm 12 and permit the latter to have its lateral movement. The rod 28 terminates in a vertically disposed portion 29 which is adapted to extend into the path of the sound conveyor or tone-arm 12 and to be engaged thereby. The trip member 25 with sleeve 27 is pivotally secured to the base plate 13 so as to permit slight rotative movement thereof; and with the trip arm or rod 28 in frictional contact with the sleeve 27, it is evident that when the tone-arm 12 engages the upper off-set end 29 of the tripper rod, that slight rotative movement is imparted to sleeve 27 which in turn oscillates the tripper arm 25 out of holding engagement with the notched end of arcuate finger 22 of the brake-lever, thereby releasing the latter so as to bring the action of spring 19 into play, which will force the brake-shoe portion 15 into holding relation with the turntable of the phonograph.

As shown in Figure 1, the tripper rod 28 is moved so as to have the horizontally disposed intermediate portion thereof disposed somewhat tangentially to the turn-table, as shown in dotted lines, so as to bring the upper end 29 of the rod into position where it will be engaged by the tone-arm 12 when the stylus of the reproducer has reached the last or pro-selected groove of the record provided with the recorded indentations.

With my improved construction, it is apparent that the stop device may be set to apply the brake at any desired point by simply moving the upper end 29 of the tripper rod 28 into such vertical position where the tone-arm will engage therewith when the stylus of the reproducer has reached the desired point; the movement of the tripper rod, as described, being possible because of its frictional relation with the tube or sleeve 27; the frictional relation, however, being such as not to be affected by the contact of the tone-arm so far as its relation with the tube 27 is concerned. WVhen the tone-arm engages the upstanding portion 29 of the tripper rod, it will cause slight rotation of sleeve 27 and in turn oscillate the arm 25 in a direction away from the notched end of arcuate finger 22, namely toward the lug or stop 26, as shown in Figure 3.

With my improved construction, it is unnecessary to change the construction of the usual tone-arm or to provide it with a tripping member or attachment; the brake and tripping mechanism of my construction constitutes a single unit or device which may be readily applied to any type of phonograph; while the tripper rod or element may be quickly adjusted to any sized record, with the adjustment being such that it will promptly release the brake and stop rotation of the turn-table at the desired point without necessitating additional or unnecessary rotations of the turn-table beyond the last or pre-selected groove provided with the recorded indentations.

The brake-lever 16 and the tripper arm 25 are so positioned and related that the tripping mechanism will be automatically placed in position to maintain the brake in inoperative position, by simply grasping the hand portion 18 of the brake-lever and oscillating the lever about its pivotal point 17 in a direction to move the brake-shoe away from the turn-table and to an extent sufficient to have the brake-shoe end of the lever engage with the tripper arm 25, at which time the curved or notched finger 22 will be in a position to receive the end 2a of tripper arm 25; the latter being forced over by the brake-shoe end of the lever 16 and engaging in the notch of finger 22 the moment hand portion 18 of the brake-lever is released. Such positioning of the brake-lever at the same time distends spring 19 and increases the pull on the brake-lever which will cause the latter to rapidly move into braking position when the .arcuate end 24 of tripper bar 25 is moved out of abutting relation with the finger 22. It is evident, therefore, that a resetting of the brake or tripping mechanism is therefore automatically accomplished in the single operation of the brakeshoe out of braking contact with the turntable.

I have shown and described what I believe to be the simplest and best exemplification of my invention, but modifications may be made in certain details of construction without, however, departing from the spirit of my invention. I

lOO

messes Y -What I claim and wish to secure by Letters Patent is 1'. 1A stop of the class described, comprising a base plate, a brake lever pivoted intermediate of its ends on the base plate and provided with a turn-table engaging portion while the other end constitutes a hand lever, the hand lever portion being provided with an arcuate extension concentric with the pivotal point of the lever, a spring secured at one end to the base plate while the other end is secured to said lever adjacent the turn-table engaging portion thereof, a trip member pivotally secured on the base plate adjacent to the turntable engaging end of said lever, said trip member being adapted to form holding relation with said arcuate extension, and tone-arm engaging means having adjustable relation with said trip member and adapted to cause oscillation of the latter away from said arcuate extension when said means is engaged "by the tonearm.

2. A stop of the character described, comprising a pivoted brake-lever provided with an arcuate extension, a trip member adapted to be actuated by the tone-armof a phonograph when said tone-arm reachesa prearranged point, said member being pivoted and provided with an arcuate end adapted to engage with the arcuate extension of the brake-lever to hold the same in non-braking position, the arcuate extension of the brake-lever and the arcuate end of said trip member being arranged to move in concentric relation with each other so that movement in one direction of the brakelever will cause the trip member to be moved into holding engagement with the brakelever, and means whereby the brake-lever will be forced into braking position.

3. A stopiof the character described, co1nprising a pivoted brake-lever provided with an arcuate extension adjacent the pivotal point thereof, a trip member adapted to be actuated by the tone-arm when the latter reaches a prearranged point, said member being pivoted and provided with an arcuate end disposed concentrically with the arcuate extension of the brake-lever and adapted to engage with said arcuate extension to hold the brake-lever in non-braking position, the relation between the arcuate portions being such that movement of the brake-lever in one direction will cause the trip member to move into holding engagement therewith, means adapted to limit the movement of the brake-lever and trip member, and means whereby the brake-lever will be forced into braking position.

4:. A stop of the character described, comprising a brake-lever pivoted to move through the arc of a horizontally disposed circle, a trip member pivoted to move through an oppositely facing are of a horizontally disposed circle, one end thereof be ing adapted to form holding relation with said brake-lever, the relation between the brake-lever and trip member being such that movement of the brake-lever into nonbraking position will cause the brake portion thereof to force the trip member into holding relation with the portion of the brake-lever disposed on the opposite side of its pivot point, means adjustably secured to said trip member and to be engaged by the traveling member of the phonograph, and means whereby the brake-lever is forced into braking position when said trip member is actuated by the traveling member through the medium of said adjustable means.

5. stop of the character described, comprising a brake-lever pivoted intermediate of its ends and provided with an off-set portion describing an arc concentric with the pivotal point of said lover, a trip member pivotally secured beyond the brake-end of said lever and provided with an arcuate end arranged concentric with the offset portion of the lever and adapted to have abutting relation with the end of the off-set portion of the lever and thereby holdthe latter in nonbraking position, the relation between the brakedever and trip member being such that movement of the brake-lever into non-braking position will force said trip member into holding relation therewith, means, adapted to limit the movement of the brake-lever and trip member, means adjustably secured to the trip member and adapted to be engaged by the traveling member of a phonograph when the latter reaches a prearranged point, and means whereby the brake-lever will be forced into braking position when the trip member is forced out of holding relation therewith through the medium of said adjustable means.

6. A stop of the character described, comprising a brake-lever pivoted intermediate of its ends, one end constituting a turn-table engaging portion while the other constitutes a hand lever, a pivoted trip member adapted to hold the brake-lever in non-braking position, the relation between the brake-lever and the trip member being such that movement of the brake-lever about its pivotal point into non-braking position will cause the turn-table engaging portion of said lever to force the trip member into holding relation therewith, means adjustably secured to the trip member and adapted to be engaged by the traveling member of a phonograph when the traveling member reaches a prearranged point, and means whereby the brake-lever will be forced into braking position when said trip member is actuated through the medium of said adjustable means.

7. A etc of the character described, comprising a ase-plate, a brake-lever pivoted tween the brake-lever and trip member being such that movement of the brakedever into nonbraking position will force the trip member into holding relation therewith, means whereby the trip member and brakemember will be maintained in intimate relation with each other, a tone-arm engaging member having adjustable relation with the trip member whereby the latter is moved out of holding relation with the brake-member when the tone-arm reaches a predetermined point in its travel, and a spring secured to the base-plate and to said brak'elever adapted to force the latter into holding relation with the turntable.

8. A stop of the character described, comprising a base plate, a brake-lever pivoted intermediate of its ends on the base plate, one end of said lever constituting a turntable engaging portion while the other constitutes a hand-lever, the hand-lever por tion being provided with an arcuate extension formed concentric with the pivotal point of said brake-lever, a trip member pivoted on the base plate and provided with an arcuate end arranged concentric with the arcuate extension of the brake-lever and normally in sliding relation therewith, the relation between the trip member and brake lever being such that movement of the turntable engaging portion of the brake-lever into non-braking position will cause said portion to engage the trip member and force it into holding relation with the areuate eX- tension of tne brakedever, means having adjustable relation with the trip member and adapted to be actuated by the traveling member of the phonograph when the latter reaches a predetermined point in its travel, whereby the trip member will be moved out of holding relation with the brake-member, and means whereby the turn-table engaging portion of the brake-lever will be forced into holding relation With the turn-table when released by the trip member.

BURR B. BLOOD. Witnesses G. HEIDMAN, N. A. STREET.

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