US504249A - Charles e - Google Patents

Description

(No' Model.) v p 1 0,13. SGRIBNER, MULTIPLE SWITOHBOARD'KEYBOARD APPARATUS,

No. 504,249. Patented Aug. 29,1893.

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I f 1 i G UNITE TATES VATEN'I OFFICE.

CHARLES E. SCRIBNER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE WESTERN ELECTRIC COMPANY, OF SAME PLACE.

' M U LTI PLE SWITCH BOARD KEYBOARD APPARATU S.

SPECIFICATION forming part of Letters Patent-No. 504,249, dated August 29, 1 893.

Application filed December 6, 1887. Renewal December 13, 1892. Serial No. 455,011. (No model.)

To all whom it may concern.-

Be it known that I, CHARLES E. SORIBNER, a citizen of the United States, residing at Chicago, 1n the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Multiple Switchboard Keyboard Apparatus, (Case No. 145,) of which the following is a full, clear,concise, and exact description, reference being had to the accomro panying drawings, forming a part of this specification.

My invention relates to the flexible cords and terminal plugs of a single cord multiple switchboard system, and its object is to afford r 5 a ready means of closing a telephone through the operators telephone line when a plug is lifted and the normal ground removed. The plug is provided with a metallic shank which is insulated from the extreme tip, the extreme tip and shank being connected with different strands of a flexible cord, one strand leading to the line and the other to the operators telephone line. On lifting the plug and closing the connection between the ex- 2 5 treme tip and the metallic shank, the line is at once connected with the operators telephone. I preferably provide a flexible metallic tinsel piece in the form of a cot upon the finger of the operator which the operator presses against the plug point so as to bridge over the insulation between the extreme tip and the shank. Instead of tinsel the operator may insert the tip of the plug in mercury or make the connection in other'suitable 3 5 manner.

My invention is illustrated in the accompanying drawings, in which- Figure 1 is a diagram illustrative of sections of two multiple switchboards and two telephone lines connected therewith according to the single cord system, the test wires being also shown connected in the usual manner. Fig. 2 is a detailed sectional view of the plug.

5 The circuit of telephone line a may be traced normally through spring-jack 1) upon the first board and spring-jack 0 upon the second board through the individual annunciator d and thence by wire e to switch f and thence by strand 9 of the flexible cord to the shank of plug h, the shank of plug h being in electrical connection with the heel piece of the plug. The heel piece normally rests upon ground contact spring 41, thus closat board 2, is connected with strand t of the flexible cord, this strand t leading to the extreme tip of the plug. The operator at board 2 on seeing the shutter of line a fall, at once picks up the plug of line a, thus lifting the heel of said plug from the ground plate and taking off the normal ground connection of the line. At the same time he lifts the plug. He also by means of the tinsel 14 upon his finger bridges over the insulation between the tip and the shank. Thus the line 0!, is connected with the telephone 2;. The circuit thus closed may be traced byline a, through the spring-jacks b c and annunciator d and wire 6 to spring f and thence by strand g to the shank of plug it and thence by tinsel u to the extreme tip of the plug which is connected with strand t of the flexible cord and thence through the telephone 1; to ground. The op erator thus, as he lifts the plug, may, by the same hand and at the same time, close the circuit of the line through his telephone. Upon receiving the order he uses, preferably, the same plug to make the usual test, and if he finds the line wanted free, he at once inserts his plug it therein and by means of a key 20 or in any other suitable manner, throws current to line to call the desired subscriber. Having thus described my invention, I claim as new and desire to secure by Letters Patent-- l. A telephone line connected with one point of a terminal plug and a telephone connected with another point of the same plug,

and a connecting device for closing the oirtip and the shank at the will of the operator,

ouit between the two points of the plug to as described. to connect said line with the telephone, sub- In witness whereof I hereunto subscribe my stantially as described. name this 17th day of October, A. D. 1887.

5 2. Aplug provided with an insulated shank CHARLES E. SORIBNER.

and an insulated tip and a yielding metallic Witnesses: fabric adapted to be worn upon the finger so WM. M. CARPENTER,

as to readily close the connection between the CHAS. O. WOODWORTH.

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