US488993A - John chisholm francis - Google Patents

Description

(No Model.)

J. G. FRANCIS. TELEPHONE SWITCH.

Patented Jan. 3, 1893 2 3E: I I

a s ii 1 "7 I .M M w IHII q/vihwoo a5 MAM/Q6 M 105} UNITED STATES PATENT OFFICE.

TELEPHONE COMPANY, E SAMEPLACE:

LTELEPHQNEn-SWITCH'.

SEECIFIGATION forming part of Letters Patent No.488,993,'dated January 3, 1893. Application filed February 15, 1892. Serial No. 421,560- (Ro modeh To all whom it may concern:

,Be it known thatI, J onn Omsnonm FRAN-V 01s, a citizen of the United States, residing at York, have invented certain new and useful improvements in Telephone Switches, of

which the following isa specification.

My invention relates to telephone switches, and has for its object to provide means whereby when the ordinary hand telephone or receiver is in position on its hoolqthe switch will beheld in such a position as to include the signal devices in the line, andwh;en the hand telephone is removed fromitshook for the operator to listemtheswitchtis automath cally moved. to cut out the signalingdevices, itnd include the telephone instruments in the l'ilG--.

To these ends my invention consists in'the construction and .it'rrazigemntsubstantially as hereinafter more particularly-pointed out;

Referring to the accompanyingdrawings, Figure 1, is a sectional device' fithrough the telephone switch, the box or supportshowing the position of the parts when the hand telephone-is removed; Fig. 2, is a sidefview of the sameg'Fig. 3, is asectional view-showing the position of the switch when-the hand telephone is on the hook. s I i It is well understood that'in operating the ordinary telephone lines, it is desirable to have the circuits normally arranged,- so that the signal devices at the 'subscribers station are normallyincluded in the line, while th'c telephone instruments are excluded, so {that not only is the resistance of the telephone in:

strumcu ts normally out of the line, but the instruments are less. liable to ,injury from excessive current orotherwise, which may pass over the line; When, however, the instruments are to housed fortalking, it is equally I usually supporting the transmitter, signal dedesirable to have the signal devices excluded from. the main line so as to cut out their resistance, and to include the telephones, and

my invention involves a' simple, cheap and efiective switch, whereby this may be accomplished.

In the drawings M represents a portion of the box, case, or other support for the switch, and this may of course be a part of the case vices, &c., belonging to the subscribers Sta-- tion. Supported in this case is the hook A,

JOHN CIIlSl-IOLM FRANCIS, NEW'YORK, NYQY, ASSIGNOR TO THE ECHO which is shown of a form to receive the ordinary hand or receiving telephone B. This hook is provided with a shank or shaft B, which extends through thecasing M, and is preferably mounted in a bearing piece E, so as tofurnisha good support for the book. This bearing piece E comprises a 'plate E, which is adapted to fit on the outside of the box or case, and an inward projection E fitting in an opening in the case, and it may be "secured to the case by suitable screws F.

Mounted on the end of the shaft or spindle sitting essentially of a block of insulating material provided with asectorD of conducting material, and this may be secured to the spindle in any suitable way, as by ascrew d, so as not only to hold it in position,but form good electric connection between the sector and the spindle. The spindle or shaft is provided with a tension spring G, shown in the present instance as a coiled spring, one end of which is fastened to the spindle, and the other to the bearing E and the tendency of this spring is to maintain the parts in the position shown in Fig. 1.

Mounted upon suitable insulating plates as T, ,T' are the s ring contacts or brushes S,

S S and these are arranged so as to non mally bear on the surface of the commutator .O. Connected to these brushes are thewires leading to the-usual instruments, as for in- -stauce, connected to the brush S is a wire leading to the signaling devices, while the conductors connected tothebrushes S and S lead to the telephone instruments in the usual way." In the present instance, these insulating plates are mounted upon posts or projections P, which are in turn connected to, or form part of the plates P, and these may be supported-or attached to the casing M in any suitable manner, or preferably as shown by the screws F, which also hold the plate E in position. With this arrangement,

it will be seen that as shown in Fig. 1, with the hand telephone or receiver removed, un-

der the tension of the spring, the hook and commutator are turned to the position shown,

. so as to bring the conducting sector D under 'B,'i s a commutator or switch piece .0, con- I II.

tomatically to the position shown in Fig. 3,

in which it will be seen that the conducting sector D, is under the end of the brush S leading to thesignai devices,while the brushes S and S rest upon the insulating portion of the commutator. Under these conditions, the devices are in position to receive the signal calling the subscriber, and as. soon as he removes his hand telephone to listen to the call, the transmitter is automatically included in the cirouit'by the rotation of the commutator under the influence of the spring and the'signal devices are cut out. A

What I claim is '1. A telephone switch comprising a rotatahlehook for supporting the telephone having a shaft rotating therewith in the plane of the hook, a commutator mounted on theshaft, and brushes bearing on the commutator, substantially as described.

2. A telephone switch comprising a rotatable hook, having a shaft rotating therewi h in the plane of the hook a spring for rotating it, a commutator mounted on the shaft of the hook, the commutator having a. conductingportion connected tothe shaft, and contact terminals bearing on the commutator,

substantially as described.

3. A telephone switch comprising a mint able hook, the shaft of which is mounted in bearings of conducting material, a spring for rotating the shaft, a commutator mounted on the end of the shaft, and having a conductin'g portion connected to the shaft, and contact terminals bearing on'the commutator,

substantially as described.

4. In a telephone switch, the combination of the rotatable hook, a bearing for the same -the plane of the support, a commutator mounted on the shaft, brushes bearing on the JNO. CHISHOLM FRANCIS.

Witnesses: I I

GEORGE G. ORosBY,

JOHN A. KHUNES

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