US1622335A

US1622335A - Babio beceitek attachment fob telephomes

Info

Publication number: US1622335A
Authority: US
Publication date: 1927-03-29
Anticipated expiration: 1944-03-29

Description

' 1,622,335 March 29, 1927. G. F. MITCHELL RADIO RECEIVER ATTACHMENT FOR TELEPHONES 'F'iled Oct. 5, 1925 s Sheets-Sheet 1 March 29, 1927. 1,622,335

G. F. MITCHELL RADIO RECEIVEHATTA CHMENT FOR TELEPHONES Filed 001,.5, 1925 3 Sheets-Sheet 2 gwue'ntor 25% d M 6mm? March 29,1927. 1,622,335

G. F. MITCHELL RADIO RECEIVER ATTACHMENT FOR TEL EPHONES.

Filed Oct. 5, 1925 s Sheets-Sheet 5 IIHIIIIIIIIII [w llmllllllii snow Mow enonen r. MITCHELL, or wasnrneron, premier on confine.

RADIO RECEIVER ATTACHMENT FOR TELEPHONES.

Application filed October My invention relates broadly to radio receivlng systems and more particularly to the construction of a radio receiver which may be attached to the standard telephone.

s Une of the objects of my invention is to provide a simple construction .of radio receiving apparatus which may be readily attached to the standard house telephone for the reception of radio broadcast news, conto certs, music and entertainment.

Another object of my invention is to provide a construction of radio receiving apparatus which is readily attachable to a standard tele hone and which may be readily conl nected 1n the telephone circuit without the necessity of erecting an antenna or modifying the telephone installation in any way heyond making simple connections with the telephone conductors. 2i? Still another object of my'invention'is to provide a practical construction of rio receiver attachment for telephones which may be readily transported from place to lace and secured to the telephone ready 95 or operation without interference with the normal functioning of the telephone. A further object of my invention is to provide a radio receiving attachment tor telephones which may he snapped upon the usual telephone stand and t e usual telephone receiver utilized both for the recep-" tion of radio signals in addition to its usual .icunction as a receiver for the line wire telephone communication.

Other and further objects of my invention will be understood from the specification hereinafter following by reference to the accompanying drawings, wherein Figure 1 is a side elevation showing the radio receiver attachment secured to a telephone stand; Fig. 2 is a rear view showing.

usual telephone receiver is employed "for the reception of radio signals; Fig. 6 is a modified view of a radio receiver attachment employing an adjustable tuning inductance; r Fig. 7 is a perspective view showing a telephone stand with the radio receiver attachment of my invention secured thereto; Fig. 8

3, 1925. Serial No. 60,345.

\ apparatus of the radio receiver attachment.

Referring to the drawingsin more detail, retesence character 1 represents the telephone stand which includes the carrier hook 2 for supporting the telephone receiver 3. A flexible connection 4 is provided between the telephone receiver 3 and the telephone stand 1 from which the conductor 5 leads to the telephone box and line. The telephone stand carries the transmitter 6. A 1

vertical longitudinally extending supporting member 7 is provided forming the housing for the radio receiving apparatus with an insulated plate 8 forming one side thereof, The supporting member 7 conforms substantially to the shape of the telephone stand 1 and base top portion 9 at the upper extremity thereof which supports a rectifier or crystal detector. The supporting member? is detachably secured to the telephone stand 1 by means of the

resilient devices

10 and 11 having

spring arms

10 and 10", and 11 and 11", which grip opposite sides of the telephone stand. A contact strip 12 is provided at the upper extremity of the supporting member 7 which engages and establisheselectrical connection with a portion'ot the telephone stand 1. The rectifier comprises a cup member 14 which contains sensitive crystal 15. A standard 16 is mounted on the plate 9 permitting an arm carrying a cat whisker 17 to be moved to various positions by means of universal joint 19 under control of the adjusting knob 18. I provide a latch 20 pivoted at one side of the supporting member 7 and arranged to overlie the hook 2 in abutment with pin 21 for preventing the operation of the hook 2 when the telephone receiver 3 is used as the radio receiver and is removed from the hook '2. In Fig. 10 I have illustrated a. simplified arrangement of the receiving circuit wherethe telephone headset 22 is connected across terminals AA' and BB which connect respectively with the contact member 22 establishing connection with6 the telephone stand and the ground at 2 1 of. As represented in Fig. 13 I ma In Fig. 11 I have shown a form of receiving apparatus where the telephone headset 22 is shunted by means of a condenser 23 and wherein a tuning in' uctance 24 with' adjustable contact 25 is provided as schematically illustrated in Fig. 6. I may prbvide an electron tubecircuit at the receiver as represented in Fig. 12 where a variable tuning condenser 27 is positioned between thecontact member-12 and the tuning inductance 24 and the tube 28 arranged to function as a detector with grid condenser and grid leak 29in the input circuit thereprovide stages of amplification after he detector 1517 with an audio frequency coupling transformer 30 arranged to impress the rectified energy upon the amplifier tube 31. Fig. 14 illustrates schematically the principle of my radio receiver attachment, where the input circuit of the radio receiver apparatus is virtually connected to one side of the telephone line 32 through the inherent capacity 33 existing between the telephone stand and the leads. A coupling transformer 34 may be arranged to impress the received signaling energy upon the detector circuit.

In Fig. 5 I have shown .the telephone stand 1 broken away illustrating

interior contacts

35, 36, 37, and 38 interiorly ofthe stand. Wires lead from binding posts E and F to the conductors 4 which connect with the telephone receiver 3. In order to more clearly illustrate my invention I have shown the terminals AA and BB in the cross-sectional view of Fig. 5 one below the other although it will be understood that they would normally appear one behind the other.

Flexible connectors

39 and 40 rovided with pin connections are arrange to be passed through the insulation of the flexible conductor 4 to com lete an electrical circuit throu h the telep one receiver 3, placing the te ephone receiver 3 in the out put circuit of the radio receivin apparatus.

Fig. 7 more ,clearly shows the arrangement of parts of the radio receiver attachment. The wiring arrangement when the telephone receiver 3 is used in theoutput circuit of the radio receiver is'illustrated in Fig. 15. In Fig. 8 I have shown the supporting member 7 enclosing miniature electron tubes 42 and 44 and coupling transformers 41 and 43 for increasing the amplitude of the received signaling energy to such a point that reception at any desired volume is practical over the radio receiver attachment. In Fig. 9 Ihave shown a terminal face 49 which is. formed directly upon the telephone stand 1 providing socket terminals 45 for cooperation with pin terminals 47 on the connector 46 which connects throu h flexible lead 48 with the output cir- .cuit'o the radio receiving set. In this construction it is unnecessary to provide pin tap connections between terminals AA and BB when it is desired to utilize the telephone receiver 3 both asa receiver of radio signals and asa receiver of the normal line wire telephone communication.

It will be understood that the radio receiver attachment o f my invention may be employed on the usual telephone stand withone side of the line is groun ed the radio I set can be connected with the grounded side of the line and an independent ground connection 26 becomes unnecessary.

While I have described my invention in certain particular embodiments I desire that it be understood that modifications may be made and that I intend no limitationsupon the invention other than those imposed by the scope of the appended claims.

What I claim and desire to secure-by Let- .ters Patent of the United States is as follows:

1. A radio receiver attachment for telephones com rising, in combination, a telephone stan a support adapted to carry radio receiving apparatus, a contact member extending rom said support, and spring arms carried by said support for engagement with opposite sides of said telephone standfor securing said support with respect to said telephone stand with said contact member in operative engagement with the upper 'extremity of said telephone stand for-establlshing electrical connection therewith.

2. A radio receiver attachment for telephones com using, in combination, a telephone stan a supporting block substantlally conforming to the shape of said telephone stand, said bIock carrying radio receiving. apparatus thereon, and members extending from said block and engaging said telephone stand, at least one of said members establishing electrical connection between said apparatus and said telephone stand for completing an electrical circuit through said receiving apparatus.

3. radio receiver attachment for telephones comprising, in combination with a telephone stand, supporting block arranged to carry radio receiving apparatus, resilient clip members for securing said supporting block in engagement with ,said telephone stand, and a'contact member carried by said block for directly contacting with said tele- 7 phone stand torestablishing electrical con-- messes nections between said radio receiving ap aratus and said telephone stand for comp eting the electrical circuits through-said radio receiving apparatus.

ivA radio receiver attachment for telephones comprising, in combination with a telephone-stand, supporting member adapted to carry radio receiving apparatus and having terminals for the connection of a telephone headset in circuit therewith, and securing members extending from said S11 porting member for engagement with said telephone stand, one of said securing members establishing electrical connections with said telephone stand for completing the electrical circuit through said radio receiving apparatus.

5. A radio receiver attachment for telephones comprising, in combination with a telephone stand, a supporting member carrying radio receiving apparatus, a ground term nal on said supporting member for electrically connecting said radio receiving apparatus to ground, mounting members secured to said supporting member for engagement with said telephone stand, and a contact member carried by said supportin member for. directly contacting with sai stand for establishing electrical connection between said radio receiving apparatus and said telephone stand for completing the electrical circuit through said radio receiving apparatus 6. A radio receiver attachment for telephones comprising, in combination with a telephone stand, a supporting member ar ranged to carry radio receiving apparatus, circuit connections for said radio receiving apparatus within said supporting member, terminals carried by said supporting memher for the connection of a telephone headsaid sup said radio receiving apparatus, resilient clips set with said radio receiving apparatus, a and connection terminal carried by said supporting member for establishing a circuit from said radio receiving apparatus to ground, resilient means for securing said supporting member on said telephone stand, and a connecting member carried by said supporting member and arranged to directly en age said telephone stand and establish electrical connections between said radio receiving apparatus and said telephone stand.

7. A radio receiver attachment for telephones comprising, in combination with a telephone stand, a supporting member adapted to carry radio receiving apparatus,

a crystal detector mounted on said sup orting member, terminal members carrie by rting member and connected with for securing said supporting member tosaid telephone stand, andv a member extending from one side of said crystal detector for engaging said telephone stand and establishing electrical connections therewith.

8. A radio receiver attachment for telephones comprising, in combination with a telephone stand having a telephone receiver and a hook carrier therefor, a supporting member adapted to carry radio receiving apparatus, means for detachably securing said supporting member to said telephone stand, terminals carried by said supporting member for establishing connection between said telephone receiver and said radio receiving apparatus, and means carried by said supporting member for preventing operation of the telephone receiver hook carrier when said telephone receiver is removed from said hook and connected with the said radio receiving apparatus.

9. A radio receiver attachment for telephones comprising, in combination with a telephone stand including a telephone receiver and a hook carrier therefor, a sup-- porting member, means for detachably securing said supporting member to said telephone stand, radio receiving apparatus carried by said supporting member, a member connected with said radio receiving apparatus and engaging said telephone stand tor establishing electrical connection therewith, output terminals for said radio receiving apparatus carried by said supporting member,

means for establishing connections between said output terminals and said telephone receiver and means carried by said supporting member for preventing operation of said hook carrier when said telephone receiver is removed therefrom and connected with said output terminals.

10. A radio receiver attachment for telephones comprising, in combination with a telephone stand including a telephone receiver and a hook carrier therefor, a supporting member adapted to carry radio receiving apparatus, resilient means for detachably securing said supporting member to said telephone stand, a pair of output terminals, a ground terminal and an'antenna terminal carried by said su porting member, said antenna terminal eing arranged to engage with said telephone stand and establish electrical connection: therewith, means for establishing connections between said telephone receiver and said output terminals, and means carried by said supporting member for preventing operation of said hook carrier whensaid telephone receiver is removed therefrom and connected with said radio receiving apparatus.

11. A radio receiver attachment for tele-l phones comprising, in combination with a telephone stand including a telephonereceiver and a hook carrier therefor, a sup porting member, means for detachably securing said supporting member to said telephone stand, radio receiving apparatus car= ried by said supporting member and having output terminals with leads extendin therefrom for the connection of saidte ephone receiver therewith, and a latch member carried by said supporting inember for pre-' venting operation of said hook carrier when said telephone receiver is removed therefrom and connected. with said output terminals.

12. A radio receiver attachment for tele phones comprising the combination with a telephone stand having a telephone receiver and a hook carrier therefor, of a supporting member adapted to carry radio receiving apparatus, means for detachably securing said supporting member tosaid telephone stand, a terminal carried by said member and adapted to be brought into electrical contact with said stand to connect the radio receiving apparatus with said stand when said member is secured to the stand, output terminals carried by the supporting member and in connection with the receiving apparatus, and conductors for establishing connection between the output terminalsvof the apparatus and the telephonereceiver.

13. A radio receiver attachment for telephones comprising the combination ofa supporting member provided with means for detachably securing'said member to a telephone stand, a terminal carried by said, member and adapted to be brought into electrical contact. with said stand when said member is secured to said stand. and means carried by said supporting member for preventing operationof the hook switch of said telephone stand when said member is secured to said stand.

GEORGE F. MITCHELL.