US2489782A - Selector for automatic phonographs - Google Patents

Description

H. ca. JENSEN 2,489,782

SELECTOR FOR AUTOMATIC PHONOGRAPHS 5 Sheets-Sheet 1' Nov. 29, 1949 Filed Nov. 4,. 1944 Fly] Y INVENTOR. Herman & Jensen Wfw ATTORNEY Nov. 29, 1949 H. cs. JENSEN 2,

SELECTOR FOR AUTOMATIC PHONOGRAPHS Filed Nov. 4, 1944 I 5 Sheets-Sheet 2 I N V EN TOR. Herman Q Jensen ATTORNEY Nov. 29, 1949 H. e. JENSEN 2,489,782

SELECTOR FOR AUTOMATIC PHONOGRAPHS Filed Nov. 4, 1944 5 Sheets-Sheet 4 v I N V EN TOR. Herman G Jen sen JZM ATTORNEY Nov. 29, 1949 Filed Nov. 4, 1944 H. cs. JENSEN SELECTOR FOR AUTOMATIC PHONOGRAPHS UNITS DECADES 5 Sheets-Sheet 5 INVENTOR. Herman 6 Jensen ATTORNEY Patented Nov. 29, 1949 SELECTOR FOR AUTOMATIC PHONOGRAPHS Herman G. Jensen, Chicago, 111., assignor to J. P.

Seeburg Corporation, Chicago, 111., a corporation of Illinois Application November 4, 1944, Serial No. 561,984

9 Claims. (01. 177--380) This invention relates to selectors for automatic phonographs and particularly to selectors in which the individual recordings are selected by a plurality of trains of impulses, the number of impulses in each train determining the recording which is selected.

4 In the co-pending Patents Nos. 2,382,487 and 2,382,488, issued August 14, 1945, to Mahlon W. Kenney and Herman G. Jensen, and in co-pendi-ng Patent No. 2,416,445, issued February 25, 1947, to Herman G. Jensen, there are described automatic phonographs in which selections are made by two trains of impulses.

One of the objects of the invention is to provide an improved selector adapted to control phonographs of this type.

f. A further object of the invention is to provide an impulse transmitter in which the operator determines the number of impulses for each train and the two trains are then automatically transmitted by the transmitter in sequence.

. A further object of the invention is to provide an improved transmitter of this type which is rendered operative by the insertion of a coin.

A further object of the invention is to provide an improved transmitter of this type which can be located in remote relation to the phonograph. Other objects, advantages, and capabilities of the invention will appear from the following description of the preferred embodiments thereof, taken in conjunction with the accompanying drawings in which:

Fig. 1 is a perspective view of a remote control box embodying the invention and adapted to be connected to the phonograph by wires, part of the box being broken away to disclose the interior thereof;

Fig. 2 is an inverted perspective view of the box similarly broken away;

Fig. 3 is a perspective detail view showing the manner in which the switch bars are locked in;

r Fig. 4 is a wiring diagram; 1 Fig. 5 is a modification adapted for the transmission of radio frequency impulses, and

Fig. 6 is a wiring diagram thereof.

' Referring to Figs. 1 to 4 of the drawings, the reference numeral I indicates a cover of boxlike form which is adapted to be applied to the base I l which carries the mechanism. The cover [0 is provided with an elongated opening l2 in its front panel through which project two vertical series of buttons l3. These buttons are preferably substantially square so that the opening [2 is substantially filled by the two vertical rows of buttons. The box I!) has a cutout I4 at the top of a cutout i in a side. When the box is applied to the base the marginal portions of the cutouts M and I5 extend into grooves in the base of the coin slot l6 and around the rejected coin cup 11. The elements l6 and I! are mounted on the base II. The element l1 carries an actuated lock l8 which controls a locking shaft [9 which extends transversely across the box and is supported in suitable bearings mounted on the base H. The shaft I9 rigidly carries two arms 20 which are pivotly connected to two locking bars 2|, one of which extends downwardly and the other upwardly. The outer ends of the bars 2| are guided in members 22 carried by the chassis. These ends are adapted to be projected by the lock 18 so as to engage lugs 23 carried by the box Ifl. It will readily be understood that when the box I0 is applied over the mechanism on to the base and the lock I8 is actuated by its key, the box is secured in position against unauthorized removal.

The buttons i3 are mounted individually on switch bars 24 of two switch assemblies 25 and 2E. The left hand row of buttons l3 controls the decade selection while the right hand row of buttons controls the unit selection. Each row of buttons is numbered consecutively from 0 to 9. When a selection is made one button of each row is pressed inwardly. Thus selections from 00 to 99 may be made by pressing one button of each row inwardly. As will hereinafter appear the buttons marked 0 control three impulses, the buttons 1 control four impulses and so on so that each of the 100 selections corresponds to two trains of impulses each of individual number.

Each switch bar 24 is mounted for longitudinal movement in its switch assembly as shown in Fig. 3 and each bar is biased outwardly by a spring 21. A locking bar 28 extends through openings 29. The bars 28 are biased downwardly by springs 30. Each bar 28 is provided along its outer side with undercut projections 3|, each one of these projections being directed towards one of the bars 24. In normal condition the bars 28 are held with their projections 3| clear of the bars 24 by means of a generally horizontal table 32, which carries two adjustable set screws 33 which engage the lower ends of the bars 28. In normal condition any button I3 which is pressed inwardly is immediately returned to normal position by its associated spring 21. The table 32 is pivotly mounted on brackets 34 carried by the chassis. The table 32 carries a forwardly and upwardly projecting arm 35 which normally rests on the high spot 36 of a cam 31. When the cam 3i rotates in the counterclockwise direction as indicated by the arrow in Fig. 2 the arm 35 drops on to the step 38 of the cam 31 so that the table 32 and the bars 28 move downwardly bringing the lower cam shaped ends of the projections 3i into the openings 29 of the bars 24. If a button l3 isv now pressed inwardly the bar 28 is cammed upwardly and when the button [3 is pushed into its full extent its projection 3| enters an opening 59 in the bar 24 thus locking the bar 24 in. Continued rotation of the cam 31 clears the step 38 from the end of the arm 35 so that the springs 30 move the bars 28 and the table 32 a further step downwardly. This further movement of the bars 28 brings the projections 3| fully into the openings 2c of the unactuated bars 24 and fully into the opening 39 of the actuated bar 24. In this condition the cam shaped ends of the projections 3| are beyond the associated bars 24 and consequently the actuated bars 24 are locked in and the unactuated bars 24 are locked against actuation until the cam 3! has completed a single revolution.

The arm 35 cooperates with a switch assembly 40 which comprises a normally closed switch 4| and a normally open switch 42. When the arm 35 engages the high spot 36 of the cam 37 the switch assembly is in the condition shown at Pos. l on Fig. 4. When the arm 35 engages the step 38 on the cam 3? both switches l! and d2 are open as shown at Pos. 2 on Fig. 4. When the projection 38 moves away from the arm 35 the switch 62 closes and the switch 4! is open as shown at Pos. 3 on Fig. 4.

A motor 33 mounted on the chassis drives the shaft id on which the cam 37 is mounted at a slow speed through a speed reducing train of gearing 55. Two contact arms ti; and ll are rigidly mounted on the shaft A l and are insulated therefrom. The two contact arms and ll are in conductive contact. The shaft i t carries a cam arm 38 which is arranged to cooperate with the switch ii. At the end of a rotation of the shaft fi l the cam 38 opens the switch 59. When the cam 18 clears the switch 49 this switch closes.

A coin inserted by the coin slot it passes into a slug rejector 55 which retains a slug or spurious coin. A retained slug can be retrieved by pressing the button 5! mounted on the base of the coin slot is, whereupon the released slug returns to the cup H. An accepted coin drops automatically through a coin chute 52 into a coin box 53. In dropping through the chute the coin engages the end of a bent lever 5 which is pivotally mounted at 55, and swings this lever in the counterclockwise direction. When the lever 5 is thus swung an insulating member 56 carried by the lever closes the normally open switch 5?. The coin carries the lever 5t below the end of a pivoted lever 58 which is normally biased against the lever by a light spring 59. Consequently, the lever 5d is locked down and the switch 51 is held closed. A bar it is slidably mounted by means of a pin GI and slot 62 and by engagement of the shaft 44 by its slotted end 83. The bar Bil is biased downwardly by means of a spring 84. This bar carries a projection 65 which is adapted to be engaged by the cam 38 after it has made a substantial part of a single revolution from its initial position. The cam 58 thus moves the bar 65 upwardly. Its upper end is adapted to engage operatively one arm of a bell crank lever 56, the other end of which has a projection 67 adapted to engage the lever 58. The arrangement is such that the upward movement of the bar 5t swings the lever 66 which in turn swings the lever 58 clear of the lever 5 Thereupon the resilient leaf of the switch 57! swings the lever 5 back to its normal position and the switch 5'! opens.

The arm ll engages a grounded conductive ring 68 mounted on a stationary disc 59 of insulating material. The arm 46 is arranged to engage four series of contacts 10, ll, 12 and l3 arranged on a circle on the disc 69. The contacts l5 and 'il are equally spaced, likewise the contacts i2 and it. A larger space M is provided between the two groups of contacts El and for the purpose of separating the two trains of impulses. A still larger space i5 is provided between the two groups Ti) and '13.

One terminal of the motor 33 is grounded to the ground line it. A power line, suitably a 25 volt line l? is connected to one side of the switch 39, to one side of the switch 52 and to one side of the switch 57. The ungrounded terminal of the motor is connected to the other side of the switch as, to the common pole of the switches ll and 52 and to a line 73. The other side of the switch 5"! is connected to a line 79 and'jto the other side of the switch A third line Bil, the impulse line is connected through two series switches 52 to a line 83. The switches 82; are located at the upper ends of the locking, bars 28, which bars normally hold the switches open. The switches 82 are arranged to close when the bars 23 move into locking position, that is when the arm 35 moves off the step 38. Consequently the line 83 is connected to the impulse line only when the selecting bars 2ft defining the selection are locked in.

Each switch assembly 25 and 26 comprises a; series of stationary contacts 85% which are normally connected in series by movable contacts 55 carried by the bars 2 2'. The first contact 84' of each series is connected to the line 83. The contacts of groups ii and 12 are also con-. nected to the line 83. The second contact. 8d of the decade switch assembly 25 is con nected to the contact of group ll] which is ad; jacent the group ii. The third contact 8 1. is connected to the next contact of group It and: so forth. When one of the buttons 3, for ex-. ample No. 5 of the switch assembly is displaced inwardly, the first six contacts of group Ill are connected to the line 83 and the last three contacts of the group iii are disconnected from the line 83. The connections of the contacts 85 and the contacts 8:"; of the unit switch assern ly 26 are similarly connected to the group of contacts l3. Thus if the button it No. 3 of the switch assembly 25 is displaced inwardly only the first four contacts of the group '53 adjacent of thegroup 712 are connected to the line 83.

The arm 53 is initially inthe space 15 and during each selection the arm makes a complete revolution. It will readily be understood that with the button settings just mentioned the line 83 will be grounded nine times and seven times to create two spaced trains of impulses of these numbers corresponding to selection No. 6Q. If the two buttons l3 No. 0 and No. 0 are displaced only the groups ii and i2 are connected to the line 63 so that two trains each of three impulses will be created corresponding to the selection No. 60. If the two buttons l3 No. 9 and No. 9 are displaced the two trains each of L2. impulses will be created correspondTng to the. selection No. 99. When the arm t3 moves over the contacts or the four groups lfi, ll, 72 and 13. the bars 28 are in their locking position and the, impulses created are transmitted through the line 88, the switches 8i and 82 being closed. The cam 3? is configured so that the bars 28 aremaintained in locking position unttil after the arm '36 clears the contacts of the group 13.

The line 19 isconnected to a series of stationary contacts 86 in one of the switch assemblies. forexample switch assembly 25. Each switch assembly comprises a plurality of movable contacts 81 which are normally connected in series. When one of the buttons is pressed inwardly the series 87 is broken and the movable contact 81 connects the right hand end (Fig. 4) of the contacts 01 to one of :the contacts 80. The right hand end of the series 81 of the decade switch assembly is connected to the contacts 85 of the other switch assembly 26. The right hand end of the series 81 of the switch assembly 26 is connected to the line I8.

The operation is as follows:

A coin of appropriate value is inserted in the coin slot I5 locking the switch 51 closed. The

circuit of the motor 43 is thus completed through the normally closed switch M and the shaft 44 begins to move in the counterclockwise direction. The high spot on the cam 31 clears the end of the arm 35 so that the switch M is opened,

the switch assembly 49 changing to the condition shown at Pos. 2 in Fig. 4 and the motor stops. The bars 28 have moved to bring the cam shaped ends of the projections 3| into the openings 29 of the bars '24. selection by pressing one button I3 of the decade series and one button I3 of the unit series. These two buttons are held in, by their projections 3I in their openings 39. The actuation of one bar 24 in each of the switch assemblies 25 and 26 connects the line I9 to the line "I8 so that the circuit of the motor 43 is again completed and the operation of the shaft 44 is resumed. The circuit of the motor now is line I1, switch 51, line I9, two switches 81, line 18, motor 43 and grounded line IS. The movement of the shaft 44 moves the step 38 of the cam 31 away from the end of the arm 35 so that the bars '28 move into locking position. The two actuated buttons I3 are now held in and actuation of any of the other buttons is prevented. When the step 38 of the cam 31 clears the arm 35 the switch 42 is closed as shown in Pos. 8 on Fig. 4 so that the circuit of the motor is completed independentl of the switch 51. This circuit is line H, switch 42, motor 43 and grounded line I6. Thereafter the cam 48 clears the switch 49 which provides an additional circuit for the motor 43. This circuit is line 11, switch 49, motor 43 and grounded line 16.

After the bars 28 are moved into locking position the arm 46 travels over the contacts of groups 10, II, 12 and I9. As the arm moves over the contacts of group I0 which remain connected to the line 83, for example the right hand six of these nine contacts and over the contacts Of group II, the impulse line 80 is grounded nine .times thus creating a regular series of nine impulses. The impulse circuit is grounded ring 98, arm 41, arm 46, an included contact I0 for example, line 93, closed switches 82 and line 80. As the arm 46 travels over the group I2 and the contacts of group I3 which remain connected to the line 83, for example the right hand 4 of these contacts, a regular series of seven impulses is created by the grounding of the line 80 seven times.

During the rotation of the shaft 44 the cam 48 actuates the bar 69 returning the coin lever 54 to its initial position and opening the switch 51. The motor continues to operate because switches 42 and 49 are closed. After the arm 46 clears the group of contacts I3 the cam 31 unlocks the bars 28 and returns the switch assembly to the condition shown at Pos. 1 on Fig. 4. The switch 49 maintains the circuit of the motor until the cam 48 opens the switch 49 which terminates the op- The patron can now make his the phonograph cabinet. The line may be connected to the grid of a tube in the main unit to increase the bias of the tube to effect the creation of an electrical impulse as fully described in the two applications referred to. It will of course be understood that the line 80 may be connected to a source of voltage so that a relay is operated by each impulse.

The embodiment of the invention illustrated in Figs. 5 and 6 is adapted for transmission of radio frequency impulses. The mechanical parts of this embodiment are substantially similar to those of the first described embodiment and are identified by the same reference numerals. The description of this embodiment will be restricted to the electrical system and to the minor mechanical changes which differentiate it from the first described embodiment. It is to be noted that in Fig. 5 mechanical details, primarily those associated with the coin lever 54 are omitted. These mechanical features are arranged in this embodiment in the same manner as illustrated in Figs. 1 and 2. The box I0 is made somewhat wider in this embodiment to accommodate the transformer 90, the coil assembly 9| and the :tube 92. In this embodiment the ring 98 is not grounded but is connected by line 93 to the B+ supply provided by the cathode of the diode section of the tube 92. This tube may suitably be a 70L7-G'I tube. A filter 94 is :provided for the B+ supply. The line 83 is connected to the plate and screen of the amplifier section of the tube 92. It will thus be seen that the circuit completed by the arm 49 and the contacts on the disc 69 controls the supply of 3+ voltage to the amplifying section of the tube 92.

The secondary of the transformer supplies A. C. voltage to the anode of the diode section. A tap on the secondary supplies voltage to the heaters of the tube 92. Another :tap on the secondary is connected to the switches 49, 42, and 51 to supply current to the motor 43. Another tap on the secondary provides current for illuminating lamps 95 in the box which indicate that the box is energized.

The oscillator coil assembly 9I includes the oscillator coil 96 which is tuned to a suitable radio frequency, for example 250 kc. by means of a variable condenser 91. One end of the coil 96 is grounded. A tap on the coil 96 is connected to the cathode of the amplifying section of the tube 92 and another tap is connected through a condenser 98 and a parallel grid leak resistor 99 to the grid of the amplifying section. A coil I00 is coupled to the coil 96 and is connected through condensers IOI to the ower lines I02 which supply alternating current to the primary of the transformer 90. The lines I02 may be connected to a plug I03 which can be plugged into any suitable receptacle of the power supply to which the phonograph is connected. A switch I04 in series with the coil I00 is preferably provide-d to prevent any possibility of transmission of impulses at any time that the motor 43 is not driving the arm 46 over the contacts on the discs 69. The switch I04 is normally open and it may be associated with the switch 49 so that it closes when the cam 40 clears the switch 49. As hereinbefore pointed out the cam 48 clears the switch 49 before the arm 46 engages any of the contacts 0! 75V the group 10..

7 this embodiment of useirivstiohswnehesez are omitted. The upper ends of the bars28 nor'- mally engage two insulated contacts- I85 which normally render the oscillator inoperative. The contacts I may suitably be connected to the cathode of the amplifying section of the tube 92. Thus the cathode is normally grounded and the oscillator is inoperative until both the bars 28 move into their locking positions. A key operated switch Hi6 in one of the power lines 32 is pro vid'ed to control the supply or energy to the box.

In this embodiment of the invention the box energized by closing the switch H16. The "diode section of the tube 93 supplies B+ voltage to the ring 68; The selection is made by the patron in precisely the same manner as in the preceding embodiment. Before the arm 65 engages any of the contacts on the disc 69 the bars 28 are moved itito locking position breaking the "grounding oil cult of the cathode of the 'ampliiying section of the tube 92. As the arm 46 moves over the con tacts on the disc 69 two trains of impulses or B-}'- voltage are supplied to the plate of the amplify ing section, the number of impulses in each train being determined by the selection made by the buttons 3. The supply of 13+ voltage to the oscillator puts it into oscillation to supply a corresponding number of impulses of radio frequency to coil ms and to the power lines 32. These radio frequency impulses are picked up at the phonograph and are amplified and supplied, for example to the radio frequency transi rmer I31 o'f Patent No. 2,382,488 referred to above. -It is to be noted that in both embodiments of the invention the operator may lock'i'rl more than ohe button i3 either or both series. In this event the selection made will be 'deterir n'ed by the actuated buttons bearing the lower numbers. v

Although the ihVe'l'ltlOll has befi described ill connection with specific details of a preferred embodiment thereof, it must be understood that such details are not intended to be limitativeo'f the invention except in so far set forth in the aiicompanying claims.

' I claim:

1'. A selector for automatic ph graphs a' apte'd to transmit a pluralityfof 't' r'ainso'f impulses seriatim comprising a plurality of series of manually actuable members tbnessondisg to each train, means controlled b'yfea'ch member of a series for determihin'g number of impulses in its train, normally ineffective m ns for holding said members in actited condition com-com trolled means for rend ihg said holding nleahs eifective, and means c' mouse by actuation of a member of all of the series into held position for creating the corresponding trains of impulses seriatim. I l

2. A v selector for automatic phonographs adapted to transmit a plurality of trains of impulses comprising a plurality of series of manually actuable members, means controlled by each member of each series for determining the numbe r or impulses its tram, said members being normally free, normally iheiiective means for holding said members in actuated position coincontrolled meansfor rendering said holding means efiective, a motor for creating the trains of hupulses seriatim, a switch associated with said coih cohtrolled 'Ine'a IhS adapted to 'cofiditioi'i the motor for operation, and switches associated with said members cooperating with said coin-controlled switch to energize said mfotor when a member of all of the series is in held act "ated position, to effect creation of said plurality 6f 8 trains senat'il'n, and means cent-roiled by said motor for returning 'sa-icl holding means to normal ineffective position after the creation of said trains of impulses.

3. A selector for automatic phonographs adapted to transmit a plurality of trains of im-' pulses comprising an impulser circuit including a plurality of series of contacts and a contact movable thereo'ver, a motor for driving said movable c'ontact, a coin-controlled switch adapted to energize said motor, means controlled by the motor to break its circuit before the movable contact has moved over any of the contacts oi" said series, a plurality of series of manually operable selector members, each series of members correspending to a series or" contacts, a switch associated with each member for controlling the number of contacts of the corresponding series included in said circuit, said members being normally free, normally ineffective holding means for maintaining said members in actuated positron, means controlled by the initial operation of said motor to move said holding means to eiie tive position, switch means operably associated with each member, the switch means of the series of members being in series with each other and with said coin-controlled switch, said coin-controlle'd switch and said switch means establishing an independent circuit for the motor whereby the operation of the motor is resumed by the actuati'o'n of a member of all of the series, and means controlled by the motor for terminating its resumed operation after the movable Contact has moved over all the contacts of the series, and means controlled by the motor for retaining said holding means to normal ihefie'euve position.

4. A selector for automatic adapted to transmit a plurality of trains of impulses comprising an impulser circuit including a plurality or series or contacts and a contact movable thereov'e'r, a motor for driving said movable cjo tact, a coin-controlled switch adapted to energize said motor, means controlled by the motor to break its circuit before the movable contact has moved over any of the "contacts of said series, a plurality of series of manually operable selector members, each series or members correspoi to a series of contacts, a switch associated with each member for controlling the number of contacts oi the corresponding series included in said circuit, said members being normally free, normally iiieffective holding means for maintaining said members in actuated position, means controlled by the initial operation of said motor to move said holding means to effective position,

switch means operably associated with each memher, the switch means of the series of members being in series with each other and with coincontrolled switch, said coin-controlled switch and said switch means establishing an independent circuit for the motor whereby the operation of the motor is resumed by the actuation a member of all of the series, means controlled by the motor inits resumed operation for looking all said members against displacement while the movable contact is moving over said series of contacts, and means controlled by the motor for terminating it s resumed operation after the movable contact has moved over all the contacts of the series, and means controlled by the motor for returning said holding means to normal ineffective position.

5. Aselector for automatic phonographs adapted to transmit a plurality of trains of impulses comprising an impulse? circuit including a plurality'o'f series of contacts and a Contact lr lolia bl e phonographs thereover, a motor for driving said movable contact, a coin-controlled switch adapted to energize said motor, means controlled by the motor to break its circuit before the movable contact has moved over any of the contacts of said series, a plurality of series of manually operable selector members, each series of members corresponding to a series of contacts, a switch associated with each member for controlling the number of contacts of the corresponding series included in said circuit, switch means operably' associated with each member, the switch means of the series of members being in series with each other and with said coin-controlled switch, said coin-controlled switch and said switch means establishing an independent circuit for the motor whereby the operation of the motor is resumed by the actuation of a member of all of the series, means controlled by the motor in its resumed operation for completing a circuit for the motor independent of the coin-controlled switch, means controlled by the motor after the completion of the last mentioned circuit for opening said coin-controlled switch, and means controlled by the motor for opening last mentioned circuit after the movable contact has moved over all the contacts of the series.

6. A selector for automatic phonographs adapted to transmit two trains of impulses corresponding to a single selection comprising an impulser circuit including two spaced series of contacts and a contact movable thereover, a motor for driving said movable contact, a switch assembly associated with each series of contacts, each assembly comprising a plurality of manually actuable members, switch means operated by each member for disconnecting variable numbers of contacts of the associated series from said circuit, and switch means operated by each member, the switch means of said series being in series and in the circuit of the motor whereby the motor is caused to move the movable contact over both series of contacts when a member of both assemblies is actuated.

7. A selector for automatic phonographs adapted to transmit two trains of impulses seriatim corresponding to a selected recording comprising an impulser circuit including two spaced series of regularly spaced contacts and a contact movable thereover, a motor for driving said movable contact, two series of buttons each corresponding to a series of contacts, switch means associated with each button for eliminating a definite number of contacts of the corresponding series from the circuit, a switch adapted to be closed by a coin to put the motor into operation, means associated with the motor for stopping the motor before the movable contact engages any of the contacts of the series, locking bars adapted in one position to permit actuation of said buttons and to hold said buttons in actuated position and in another position to look all said buttons against actuation, means associated with the motor for moving said bars from inoperative position into the first mentioned position during the aforesaid operation of the motor, switch means operated by each member arranged to cooperate with the coin-controlled switch to resume the operation of the motor when a button of both series is actuated, means associated with the motor for controlling the movement of the bars to the second mentioned position when the operation of the motor is thus resumed, and means for terminating the operation of the motor after the movable contact has moved over both series of contacts.

8. A selector for automatic phonographs adapted to transmit two trains of impulses seriatim corresponding to a selected recording comprising an impulser circuit including two spaced series of regularly spaced contacts and a contact movable thereover, a motor for driving said movable contact, two series of buttons each corresponding to a series of contacts, switch means associated with each button for eliminating a definite number of contacts of the corresponding series from the dircuit, a switch adapted to be closed by a coin to put the motor into operation, means associated with the motor for stopping the motor before the movable contact engages any of the contacts of the series, locking bars adapted in one position to permit actuation of said buttons and to hold said buttons in actuated position and in another position to look all said buttons against actuation, means associated with the motor for moving said bars from inoperative position into the first mentioned position during the aforesaid operation of the motor, switch means operated by each member arranged to cooperate with the coin-controlled switch to resume the operation of the motor when a button of both series is actuated, means associated with the motor for controlling the movement of the bars to the second mentioned position when the operation of the motor is thus resumed, means associated with the motor for completing an independent circuit for the motor after its operation is resumed, means associated with the motor for thereafter opening said coin-controlled switch, and means for terminating the operation of the motor after the movable contact has moved over both series of contacts.

9. In a selector for automatic phonographs, in combination, a plurality of manually operable selector buttons, means normally biasing said buttons to non-actuating position, a member normally out of engagement with said buttons and adapted to be moved into two operative positions with respect to said buttons, said member having cam surfaces to permit a button to be actuated and to be retained in actuated position when the member is in one of said operative positions, said member having locking surfaces to prevent the actuation or release of an inactuated or actuated button respectively when the member is in its other operative position, coin controlled means for moving said member into the first mentioned operative position, means controlled by said buttons for moving said member into the second mentioned operative position, and means for returning said member to normal position. 1

HERMAN G. JENSEN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,163,346 Johnson Dec. 7, 1915 1,173,564 Dyson Feb. 29, 1916 1,709,430 Hentzschel Apr. 16, 1929 2,234,937 Wilcox Mar. 11, 1941 2,304,590 Osborne Dec. 8, 1942

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