US2377162A - Portable telephone - Google Patents

Description

I May 29, 1945. J. L. LONG V 2,377,162

PORTABLE TELEPHONE Filed Feb. 18, 1944 L/4CK A. LONG 4 r roelv y Patented May 29,1945

UNITED STATES PATENT OFFICE PORTABLE TELEPHONE Jack L Long, United States Army Application February 18, 1944, SerialNo. 522,994

' (Granted under the act of March 3, 1883, as

amended April 30, 1928; 379 0. G. 757) 6 Claims.

The invention described herein may be,manufactured and used by or for the Government for governmental purposes, without thewpayment to me of any royalty thereon.

This invention relates to a portable telephone in which all the apparatus which can be connected to lines for receiving at and transmitting contacts 6 and I and thereby connect battery ll across line wires l and I6. At the receiving station shown in Fig. 1, electricity passes from line wire I6, switch contacts 1, 8, relay coil l8, and switch contacts I3, II to line l5. This energizes relay coil l8 and solicits movable contact 20 into engagement with stationary contact 2!.

. Closure of contacts 20 and 2! completes a cir- Objects of this invention are thereforei first.

to provide a handy, portable telephone; second, to provide, in a telephone systerma ringing circuit in which the signal is energized from a local battery in the talking circuit; and third, to provide in such a telephone system a sensitive rein one hand of the user and held in position so.

that the receiver 3 is adjacent his ear while the microphone or transmitter 4 is juxtaposed to his mouth. Handle 5 operates ringing switch 6 'l- 8 while handle 9 operates talking switch Ill-l ll 2l3. Pigtails l5 and I6 represent the line connections.

Referring now to Fig. 1, it is to be understood that all the elements are enclosed within casing I and cover 2 except handles Stand 9, pigtails l5 and I6, receiver 3, and transmitter 4, all of which are carried by casing I or cover 2. Connected between line I5 and switch point 6 is battery I]. Relay coil i8 is connected between switch points 8 and I 3. Signal l9 and relay contacts and 2| are connected in series across local battery 22. The microphone or talking circuit includes 'movabl'e switch member I], stationary switch contact l2, battery 22, transmitter tinduction coil 23 and switch point-I0. Line wire I6 is conrlected in series with receiver 3, induction coil Zlswitch point Ill, and line wire l5.

station, handle 5 'is operated toengage switch cuit. through electric bell i9 and battery 22. When the attention of the user is arrested by a signal from bell l9, he operates handle 9 to open switch contacts ll, i3 and close switch contacts II, III and I2. Opening contacts l3, ll de-energizes coil l8 and, therefore, signal i9, while closing contacts II, Ill, 12, throws receiver 3 and 'ment is that the ringing current for electric bell station. At the receiving station, the sensitive.

relay closes the bell circuit through the relatively low voltage (say six volts for example) battery 22 which rings the bell l9. It is understood that battery is the equivalent of and may be replaced by a small hand generator.

I claim:

1. A;ringing circuit for a telephone system having a line circuit and having a local battery in the microphone circuit comprising a signaling device and'a normally open electric switch con-- nected in series across said local battery, and a normally closed ringing switch and an electrically-operated means for closing said normally open electric switch and anormally closed talking switch connected in series across the line circuit whereby a flow of electricity through the line circuit energizes said electrically-operated means and causes it to close said normally open electric switch and. cause actuation of said si naling. device.

2. A portable telephone handset adapted for connection toa' temporary line or the like comprising a casing adapted to be grasped by the hand and having the following elements mounted on it, a battery and a normally open ringing switch connected in series and adapted" for connection across the line, a normally open microphone switch and a local battery and a transmitter and a ,receiver connected in series and forming a talking circuit adapted for connection across the line, a normally open local switch and a signaling device connected across said local battery, and a normally closed second talking switch and an electrically-operated means for closing said normally open local switch and a normally closed third talking switch connected in series and adapted for connection across the line.

3. In a telephone handset for conrfection to a line, a casing carrying a transmitter adjacent one end and a receiver adjacent the other end, a normally open talking switch and a local battery both in said casing and connected in series so as to be placed across the line, means forattracting the attention of a user and normally open relay contacts both in said casing and con.- nected in series with said local battery, and a manually operable ringing switch and a coil operating said relay contacts both in said casing and connected in series with the line, said coil, when energized, serving to close said relay contacts and connect said means in circuit across said local battery, thereby causing said means to operate.

4. ,In a'portable telephone sending and receiving unit for use with a line and inclding a sheet metal casing consisting of a cover and a housing. said housing being adapted to be grasped by the hand of the operator to support the entire case ing thereby, a microphone and a receiver both mounted on said casing, said microphone and said receiver being so spaced that they may be located simultaneously in juxtaposition to the mouth and ear respectively of the operator when the perator supports the casing by hand, a lo- I a line and including transmitting apparatus and receiving apparatus, a casingserving as a mounting for said apparatuses and afiording a grip for trically connected to the line, said device including a switch operating handle projecting from said casing, a switch in said casing and arranged for manual operation by said handle, a relay-coil in said casing and connected under the control of said switch, relay contacts under the control of said relay coil, and a signal in said casing and connected in series with said relay contacts across said local battery.

6. In a portable telephone system, a handset comprising a casing of such length and small size that it may be grasped by the hand and opposite ends thereof placed adjacent an ear and the mouth respectively of the operator, a two wire line entering the casing, a microphone adjacent one end of said casing and supported thereby, a receiver adjacent the other end of said casing and supported thereby; and the following parts all located in said casing; a local low voltage battery, a bell and normally open relay contacts in series with said battery, a relay having a coil for operating said contacts, a single pole double throw switch having first and second contacts which may be alternately energized by the pole of the switch, means connecting the pole of the switch to the first side of said line, means conmeeting the first contact to one side of said relay coil, a normally closed manually operable switch, means connecting the other side of said relay coil through said last-mentioned switch to the second side of said line, a relatively high voltage source, means connecting the second contact of said double throw switch through said high voltage source-to the second side of said line, said receiver being connected in series with said line, a microphone transformer 'having a primary winding in series with said microphone and local low voltage battery and having a secondary side of said line.

JACK L. LONG;

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