US1231537A - Call system. - Google Patents

Description

'il l. MURPHY E. MLLEH.

CALL SYSXEM.

2 SHEETS-SHEET l.

T. J. MURPHY L E. MILLER.

CALL SYSTEM.

APPLICATION FILED JULY 17. 1916.

PatentedJun 25, 19W.

2 SHEETS-SHEET 2.

ruse.

qui.

THOMAS .T.MURPHY AND EDWARD MILLER, OF ROCHESTER, NEW YORK.

CALL SYSTEM.

Specification of Letters Itatent.

. Patented June 26, 191W.

Application led July 17, 1916. Serial No. 109,689. v v

To all whom t may concern.' l

'Be it known that we, THOMAS J. MURPHY,

a subject of the King of Great Britain, and

EDWARD Mninnn, a citizen of the United States, residents of'Rochester, in the'county of Monroe and State of New York, have'invented a certain new and useful Call System; and wedo hereby declare thefollowing to be a'full, clear, and exact description of` it has forv its object to providea simple call.

system which will indicate upon calling 'Whether the party called is in position to receive the call.

By our invention signaling devices are located at the calling and at 'the called station and are each controlled by a'switch l0- cated preferably at the station called, other than the one at which the calling. device is located. The invention is dependent upon the rise in resistance of the tungsten lament, due to increased temperature, it having a low initial resistance when cold.

Referring to the figures wherein are shown a system involving our invention and devices that may be used in connection there'- with, Figure 1 illustrates a front view or cover plate for push button and lamp. Fig.

2 illustrates a shell or housing which mayA be secured in a recess formed in a wall. Fig. 3 is a sectional View taken on the line 3 3 indicated in Fig. 2. Figt is a diagram ci the connections of the parts of the system. Fig. 5 is a plate used in a modificationv ott the system shown in Fig. 1. Fig. 6r

is a view of a shell vor housing. Fig. 7 is a sectional view taken on the line 7--7 indicated in Fig.l 6. Fig. 8 is a section of a part of a structure illustrated in Figs. 1, 5 and 7 and is a View taken on the line Sf-S indicated in Fig. 5. Fig. 9 is a diagram showing connections between the parts of the modified system.

` 1, Fig. 1, is a front or covering plate :which covers a shell or housing 2, which vmay be located in a recess of a wall. The

cover platelis secured to the wall by means of screws 3 and thereby locks the housing 2 in a recess that may be cut into the wall.

The plate 1 is provided'with an opalescent glass 5, which may be secured in the plate 1 1n anyv suitable way. The plate 1 is also provided with a ,short sleeve 6 in which a push button 7 may be inserted. The push button 7 may be provided with afiange 8 vvwhich is pressed against the inner end of the cylinder 6 by means of one of the spring contacts that is operated by the push button in the manner well known in the art. The

housing 2 is provided with an inturned lip 10 at each end of the housing which iits the bevel 11 of the ends ofthe plate 1 on the under side of the plate 1 so that when the plate 1 is placed against the housing 2 the plate 1 operates to hold the housing in somewhat deiinite relation to the'plate 1.

The housing 2 is also provided with lateral extending iianges 12 to Which may be secured, if desired,.rings 13, as shown in Fig. 8, which are located on the plate 1. The ground glass lenses "5 maybe secured in the rings 13 and the rings 13 may be secured to the housing 2 by means of screws 14. which also operate to clamp the plate 1 in a` definite position relative to the housing 2.

The housing 2 is also provided with a lamp 2O having a tungsten filament 21. The lamp is secured in a suitable socket 22 and is iusulatingly supported in the interior of the housing 2, suitable means being provided for connecting the lamp 20 with an Aexternal circuit such as by the pin 23. The lamp 20 is located in proximity to the opalescent lens 5 and so as to illuminate the same when the lamp is lighted.

The push button 7 operates upon the I 'spring contacts 25 so asl to close the said contacts. The contacts are supported and connected to an external circuit by means Y of lthe pins 23 and 28. 'If desired, the hous- .ing mav be provided with insulating sheets drawing, the battery 35 is connected on one side to one of the contacts 25 and on the other side to a vibrator 36 of the Well known i type, which makes and breaks the circuit in which it is connected in its operation. It is also connected to a resistance 37 located in a shunt circuit which is closed and opened by means'of the switch 38. The vibrator and switch 38 are connected to the lamp `2O and the lamp 20 is connected to the remaining contact 25. a

In operation the system is in calling conl dition whether the switch 38 'is open or closed. When the button 7 is pressed to l dition, as when the party at the called station leaves the station, the switch 38 is closed so as to close the shunt having the resistance 37, and if then the push button 7 is pressed the shunt circuit will allow a continuous current to pass through the filal ment of the lamp 20 and will become lighted. This will put the system in feeble ringing condition, indicating at station called the condition of the system. I

In the form of the system illustrated in Fig. 9, having the parts illustrated in Figs.

5, 6 and 7, 'the covering plate 40 is provided with two opalescent glasses, one of which is' shown at 41, the figure showing the other one as being removed for purposes of illustration. The opalescent glasses are located at the ends of the plate 40 and the push b'utton 42 is located centrally with respect to the plate 40 and between the lenses 41. A housing 43 is provided with two lamps 44 and 45, which are secured in sockets 46 and 47; They are suitably secured in the housing 43.- The push button 42 operates to close the spring contacts 49. Means are provided for connecting the lamps and the contacts with an external circuit in any suitable manner. As shown in the diagram Vof Fig. 9, the battery 51 is connected to one of the contacts 49 on one side and to a vibrator 55 on the other side. arm 56 is connected to the vibrator. The switch arm 56 is made soas to bridge either pair of contacts 57 or 58 when the switch 56 is thrown in one direction or the other.- The switch contact 56 bridges lower contact 57 and lower contact 58 simultaneously, to prevent having the bell on open circuit. Thelower contacts are connected to a resistance 59 which will then be connected in shunt with the vibrator 55. The lower one of the contacts 57 is connected to the lamp A switch connectedto the lamp 45, and the lamps 44 and 45 are connected to the remaining contact 49. In the operation the switch 56 is placed either on one pair 57 or on the other pair 58, of contacts, and when the push button 42 is pressedv so as to close the circuit through the contacts 49 the current will pass either through the lamp 44 or the lamp 45 and the pair of contacts 57 or 58, according to the position of the switch 56. This will cause the current to divide at this point, part of which will pass through the vibrator 55 and a part through the resistance 59'to the battery 51. This will cause one or the other of the lamps 44 or 45 to become li ht'ed and also causethe vbell 55 to ring feehly. The lamps 44 and 45, depending on which one is lighted, will indicate to the operator whether or not the called party has received the call, for if he is in the switch 56 having contact will be placed so as to complete the circuit to the contacts 57, which will cause the lamp 44 to be lighted, and when he goes out, or at will, he will throw the switch 56 so as to complete the circuit to the contacts 58, which will cause the, lamp 45 Vto become lighted whenthe push button 42 is pressed.

The` invention may be modified by those skilled in the art without departing from the spirit thereof.

I-Iaving thus described our invention, what we claim as new and desire to secure by Iletters Patent, is,-

1. In a call system, the combinationof a. source of current supply, a circuit closer and a lamp located at a calling station, a vibrator signaling device located in series with the lamp and the circuit closer, a resistance connected in shunt with the vibrating signaling device and a switch for opening and closing the circuit through the resistance, the vibrating signaling device, the resistance and the switch located at a station to be called to cause the lamp to become lighted when the circuit closer and the switch are closed and to cause the operation of the vi` brating signaling device and to prevent the lighting of the lamp when the 'circuit closer is closed and the switch is open.

2. In a call system, the combination of a source of current supply, a circuit closer, a lamp having a tungsten filament land a vibrator signaling device located in series, a resistance connected in shunt to the vibrator lsignaling device, a switch for opening and closing the circuit through the resistance to cause the lamp to become lighted and to prevent the operation of the vibrator signaling device when the circuit closer and the switch are closed, and to cause the operation of the vibrating signaling device and to prevent the` lighting of the lamp when the circuit closer is closed and the switch is open.

1,231,537 y' i l 3. ln a call system, the combination of a source of current supply, a vibrator signalling device and a circuit closer, a pair of.

'signed our names to this specication,

lamps having tungsten laments'located .in a parallel circuits, a resistance located in a circuit in shunt t0 the vibrator signalin device, a switch for connecting either amp `with the resistance and 'the vibrator signaln device., l

n testimony whereof, We' have hereunto 1li Titoli/LAS J. MURPHYc EPWRD MULER

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