US235066A - Ed sta - Google Patents

Description

(No Model.)

AJE. BRIGGS. Telephone and Miorophonefiwitches'. No. 235,066. Patented Dec. 7,1880.

Fig.1.

Wit ass 5:

P ERS PNOTO-UTNOGRAPHER, WASHINGTON n c UNTTED STATES PATENT FFIQEO ARTHUR E. BRIGGS, OF CINCINNATI, OHIO, ASSIGNOR TO POST & (30., OF SAME PLACE.

TELEPHONE AND MICROPHONE SWITCH.

SPECIFICATION forming part of Letters Patent No. 235,066, dated December 7, 1880,

Application filed June 2, 1880.

IO others skilled in the art to which my invention relates to make and use it, reference being had to the accompanying drawings, forming part of this specification, wherein Figure l is a plan view of a telephone callbox with the cover open, and showing the se crecy-switch in the circuit of the magnetogenerator, and Fig. 2 is a like view of the box with the cover closed.

Similar letters of reference in the several figures of the accompanying drawings denote the same parts.

My invent-ion relates to a switch for telephone and microphone lines which is operated by the weight of the telephone to throw the 2 latter out of the circuit, but adapted when the telephone is removed from it to connect with the line on either side of the signal-box for the purpose of establishing communication between any two subscribers and preventing 0 their conversation from being overheard on the line. I

The object of the invention is to simplify and improve the means by which the short circuit is made and broken, and by which the primary circuit of the microphone is established and the secondary current thereof put upon the main line through the telephone; and to this end itconsists in the peculiar form of the switch and the arrangement of the springs with which it is thrown in contact to make the requisite connections.

Referring to the accompanying drawings, A represents the box containing the magnetogenerator; B, the binding-posts for the linewires 0 and ground-wire D, and having the cover hinged to one side by five hinges, E F G H I. The inner side of the cover carries the eleetro-magnets J, the switch-springs K K, the break-spring L, and the anvil M, upon which thefree end of the break-spring rests, in po- (NO model.)

sition to be operated by the push-button N projecting through to the front of the cover.

The belLhammer is attached to the arma tureoftheelectro-magnet and extends through a slot in the cover to vibrate between two bells on the outside of the cover, and thus sound a signal when the short circuit is broken by the push-pin and the current thrown to the line. This short circuit is established by wires 0 0, connecting the poles of the generator with the break-spring and anvil through the hinges E F, and when this circuit is broken, by operating the push-button the current is thrown to the line on one side of the generator through one of the pole-wires and the line-wires G, joined to the upper box-hinge, E, and is thrown to the line on the opposite side of the genera tor through the other pole-wire, the electromagnets, and the wires connecting such magnets with the breakspring and outer switchspring, K, thence through said switch-spring and along the switch andinner switehspring, K, to the other line-Wire O, which connects its binding-post with the latter spring and passes through the box-hinge G.

P is the microphone, and Q the battery, having their primary wires R It connected to two binding-posts, S S, in. the lower end of the box, said posts being also connected by a con tinuation of said wires through the two lower box-hinges, H I, to the fixed ends of two flat converging springs, T T, on the box-cover below the head of the switch.

U is the telephone, connected by wires V V of the secondary circuit from two bindingposts, W W, in the lower end of the box, one binding-post connecting with a line-wire or groundwire, and the other, by a continuation of wire V, extending to a third binding-post, W, thence to the secondary coil of the microphone, and from the latter to one of the binding-posts of the primary wire.

X is the switch, pivoted to the cover and constructed with two curved top wings, Y Y, on

a line with or above the pivot, and two smaller 9 side wings, Z Z, below the pivot. Its lower end is formed with a hook to support the telephone, and when the latter is suspended from it the top wings, Y Y, pass under and in contact with the switch-springs K K to complete the requisite connections for transmitting the signals to theline as the short circuit is broken.

After the call has been made and answered the telephone is removed from the switch and the latter swung to one side or the other to connect with the called line and cut out the line with which no communication is desired. In this position the switclrwings Y Y stand diagonally across the box-cover, disconnected from the switch-spring K of the uncalled line, but connected one with the spring K of the called line and theother with the microphonespring T, that stands diagonally opposite, While the wing Z, that projects from the upper side of the switch, is connected with the other microphone-spring T, all as shown by dotted lines in Fig. 1.

The operation of swinging the switch connects the local or primary circuit of the microphone and puts the secondary circuit through the telephone and upon the main line in the required direction. To restore the short circuit of the signal apparatus and cut out the microphone and telephone, the latter is again hung upon the switch and forces it, by gravity, into an upright position. This construction of the switch and the arrangement of its connecting-springs is much more simple than the mechanism employed for similar purposes in the telephone apparatus commonly in use, as it reduces the number ofconnections and saves the expense of several platinum contact-surfaces.

The switch-springs K K and T T are broad and flat, and the wings of the switch are beveled off so as to pass freely under them with a long rubbing pressure, and thereby insure aperlect electrical contact.

Having thus described my invention, what I claim is l. The gravity-switch X, constructed with the double wings Y Y and Z Z, in combination with the switch-springs K K and T T and their connections, substantially as described, for the purpose specified.

2. In a telephone apparatus, the four-armed gravity-switch adapted to support a telephone whose weight holds the upper arms, Y Y, in contact with the switch springs K K, and adapted when the telephone is removed to be swung to the right or left to disconnect the uncalled line and place one arm in electrical connection with the called line and two other arms in electrical connection with the microphone, to connect its primary circuit and put its secondary circuit through the telephone and upon the called line, substantially as described, for the purpose specified.

In testimony of which invention I have hereunto set my hand this 25th day of May, A. I). 1880.

ARTHUR E. BRIGGS.

Witnesses:

E. A. ELLsWoRTH, N. K. ELLsWoR'rH.

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