US764139A - Telephone. - Google Patents

Description

No. 764,139. PATBNTED JULY 5, 1904. J. W. MEAD, H. A.IMAGK1E & M. VAN BUREN.

TELEPHONE.

APrLIoATIoN FILED 0013.19` ma.

N0 MGDBL.

E mmullllg citizens of the United States, residing at Am- UNITED STATES Patented July 5, 1904.

PATENT OEEICE.

JOHN W. MEAD, HARRY A. MACKIE, AND MARTIN VAN BUREN, OF AMSTERDAM, NEXV YORK, ASSIGNORS TO SAID VAN BUREN AND JOHN J. TURNER, OF AMSTERDAM, NEV YORK.

TELEPHONE.

SPECIFICATION forming part of Letters Patent No. 764,139, dated July 5, 1904.

Application filed October 19, 1903.

To all whom t may concern.-

Be it known that we, JOI-IN W. MEAD, HARRY A. MACKIE, and MARTIN VAN BUREN,

sterdam, in the county of Montgomery and State of New York, have invented new and useful Improvements in Telephones, of which the following is a specification.

This invention relates to that class of telephones or telephone systems in which an induction-coil is employed in the subscribers signaling-circuit instead of a manual generator.

The object of our invention is to provide a comparatively simple telephone system of this character which insures the sending of a prompt and lreliable signal from the substation to the central ofiice.

A further object is to provide a telephone which can be used with the old system and which at the same time affords the advantage of automatically calling up the central oiiice by the act of removing the receiver from the movable hook or support, as in the centralenergy system.

The accompanying drawing is a diagrammatic view of the subscribers outiit of a telephone system containing our invention.

A indicates the rcceiverfwhich is normally supported by the usual pivoted hook or switchlever B.

O is the transmitter, D the subscribers callbell, and E the battery or source of electrical energy at the subscriber-s station.

F F are binding-posts forming the terminals of the main line.

g is a contact-spring which is in constant electrical connection with the receiver-hook and which is connected by awire g' with one of the main-line binding-posts-say the post F.

L is a wire connecting one side of the callbell coils with the binding-post F', and L is a wire connecting the other side of said coils with the main-line post F.

I is the usual induction-coil included in the subscribers talkingcircuit. One bindingpost of the transmitter C is connected with one end of the primary of the coil I bya wire Serial No. 177,539. (No model.)

z', while its other binding-post is connected with one pole or' the battery E by a wire i. The opposite end of the primary of the coil I is connected by a wire 2 with a switch-contact j. j" is a similar switch-contact arranged opposite the contact y' and connected with the other pole of the battery E by a wire f2. The .two contacts j j are arranged opposite a nose f3 on the rear arm of the hook B and adapted to be connected by the latter in the elevated position of the hook, as shown by dotted lines in the drawing.

One end of the secondary of the coil I is connected by a wire /c with the switch-contact j', while its other end is connected by a wire 7c' with one of the binding-posts of the receiver A. The other binding-post of the latter is connected by a wire Zwith the mainline binding-post F.

When the parts are in the normal condition (shown by full lines in the drawing) and the subscriber is called by the central ofiice, the current entering, for example, through the main-line binding-post f passes through the wire Ii, subscriber-s call-bell D, and wire 7i to the other main-line post, F. thus ringing said bell. Upon removing the receiver to answer the call the hook B is elevated by the contact-spring g or equivalent means to the position shown by dotted lines in the drawing, thereby connecting the switch-springs j" j' and closing the talking-circuit. The current now flows from the main-line post F, through the wire g', contact-spring g, hook B, contact-spring j', the secondary of the talkingcoil I, wire G, the receiver A, and wire Z, to the other main-line post, F. At the same time the transmitter-circuit is cut in in an obvious and well-known manner.

The central-oice ringing-circuit and accessories and the talking-circuit and accessories above described may be-of any ordinary construction. They form no part of our invention and are shown, by way of example, in connection with our improved automatic signaling mechanism or appliance. This mechanism is constructed as follows: m m indicate a pair of opposing switch contacts or springs which are normally separated and adapted to be temporarily connected by a contact m2, carried by the receiver-hook B, in such manner that when the hook is allowed to rise by the removal of the receiver its contact m2 rides over both of the springs m fm, but clears the same by the time that the hook reaches the upper end of its stroke and also in the depressed positionof the hook. For this purpose the free upper ends of these springs are V-shaped to form a narrow throat between them, and the contact m2 is provided at its lower end with a head or enlargement of greater width than said throat, so that the head spreads the springs, and thereby temporarily connects the same during both the upward and downward movements of the hook B.

N is an induction-coil, hereinafter termed the subscribers signaling-coil, having one end of its primary connected with the contactspring m by a wire o and having the other end thereof connected with one pole of the battery E by a wire o'. The other contactspring, m', is connected by a wire o2 with the opposite pole of the battery. A suitable automatic vibrator or make-and-break device p is arranged in the circuit of the primary for obtaining a strong induced current which reliably operates the usual ring-off drop or illuminates the ring-off lamp at the central oiiice, these signal devices being well-known and not shown in the drawing. One end of the secondary of the subscribers signalingcoil is connected by a wire g with the mainline post F, while its other end is connected by a wire g with a contact-spring q2, which bears constantly against the receiver-hook B.

It will now be understood that upon removing the receiver from the hook the latter rises, as before described, causing its contact m2 to brush over the switch-contacts fmy m and temporarily closing the subscribers signaling-circuit. When this occurs, the current passes from one side of the battery E, through the wire 02, contact-spring' m, hook-contact m2, contact-spring m, wire 0, vibrator p, the primary of the subscribers signaling-coil N, and wire o', to the other side of the battery. The impulses thus produced in the secondary of the coil N cause the operation of the usual ring-off drop or the illumination of the ringoff lamp at the central ofice. When the subscriber replaces the receiver, the hook B is depressed to its normal position, causing its headed contact m2 to again connect the switchcontacts m m temporarily and automatically notifying the central office of the fact that the conversation is finished. The central office is by this means called up instantly and automatically in the act of removing the receiver and also notified automatically when the conversation is iinished by the act of replacing the receiver, thereby dispensing with the manual generator required in the telephones employed in the old system and yet permitting the use of that system. y

Our improvement thus provides the advantage of the automatic call afforded by the central-energy telephone system without incurring the large installation expense of that system and the comparatively expensive item of skilled labor required for its maintenance.

We claim as our inventionl. In a telephone, the combination with a talking-circuit, a receiver, and a movable support for the receiver, of a subscribers signaling-circuit containing a switch, one member of which is carried by the receiver-support whereby said circuit is controlled by the movements of said support, an inductioncoil independent of the talking-circuit having its primary included in said signaling-circuit and its secondary connected with the main line, and an automatic make-and-break device independent of said switch arranged in the primary circuit of said coil, substantially as set forth.

2. In a telephone system, the combination with the main-line terminals, a talking-circuit and a movable support for the receiver, of a subscribers signaling circuit containing a switch, one member of which is carried by the receiver-support, whereby the signaling-circuit is controlled by the movements of said support, an induction-coil independent of the talking-circuit having its primary included in said signaling-circuit, an automatic make-andbreak device independent of said switch ar ranged in the primary circuit of said coil, and metallic conductors connecting opposite ends of the secondary of said signaling-coil with said main-line terminals, substantially as set forth.

3. In a telephone system, the combination with the main-line terminals, a talking-circuit and a movable support for the receiver, of a IOO subscribers signaling-circuit containing a' switch, one member of which is carried by the receiver-support, whereby the signalingcircuit is controlled by the movements of said support, an induction-coil independent of the talking-circuit having its primary included in said signaling-circuit, an automatic make-andbreak device independent of said switch arranged in the primary circuit of said coil, contacts engaging the receiver-support, a metallic conductor connecting one end of the secondary of said signaling-coil with one of the main-line terminals, a second metallic conductor connecting the opposite end of said secondary with one of said contacts, and a third conductor connecting the other of said contacts with the other terminalof the main line, substantially as set forth.

4. In a telephone system, the combination with the main-line terminals, a talking-circuit containing an induction-coil and a movable switch-hook for supporting the receiver, of a signaling-circuit containing a battery and a IIO ductors connecting the ends of the secondaryl of the talking-coil with the main-line terminals, substantially as set forth.

5. In a telephone system, the combination with the main-line terminals and a talking-circuit containing an induction-coil, of a pivoted switch-hook for supporting the receiver provided on opposite sides of its pivot With switch-contacts, a signaling-circuit containing a battery and a pair of contacts arranged to be connected by one of said hook-contacts when the receiver is removed from the hook,

a signaling-coil independent of said talkingcoil having its primary included in the signaling-circuit, a second pair of contacts bearing constantly against lthe switch-hook, one end of the secondary of the signaling-coil being connected With one of the last-named contacts, a metallic conductor connecting the other of said contacts With one of the mainline terminals, a second metallic conductor connecting the other end of said secondary with the other main-line terminal, and a third pair of switch-contacts included in the talking-circuit and arranged to be connected by the other contact of the switch-hook when the receiver is removed from the hook, substantially as set forth.

Witness our hands this 14th day of October,

JOHN W. MEAD. HARRY A. MACKIE. MARTIN VAN BUREN. Witnesses:

FLORENCE E. PEARsoN, JOHN F. DWYER.

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