US1959272A

US1959272A - Adapter

Info

Publication number: US1959272A
Application number: US435525A
Authority: US
Inventors: Le Roy J Leishman
Original assignee: Individual
Current assignee: Individual
Priority date: 1927-10-06
Filing date: 1930-03-13
Publication date: 1934-05-15
Anticipated expiration: 1951-05-15
Also published as: US1844583A; US1803555A

Description

y 1934- LE ROY J. LEISHMAN ,959,272

ADAPTER Original Filed 001;. 6, 1927 2% gmentom Zero JLea'akmarb,

Patented May 15, 1934 ADAPTER Le Roy J. Leishman, Los Angeles, Calif. Original application. October 6,1927, Serial No.

224,468.. Divided and this application March 13, 1930, Serial No. 435,525

9 Claims.

This invention relates to electrical reproducers, and primarily to a simple and efficient apparatus: for connecting. an electrical pick-up for phonographs: or telegraphone. sound box with 5, the circuits of a radio receiving set so: as to. utilize. the amplifier system thereof for reproducing phonograph selections Without materially altering the circuits of the radio set. or interfering with its: use as a receiver of radio signals at other times.

This application isa division of my application, Serial No. 224,468, filed October 6, 192? patented. Feb. 9,, 1932,, Patent No. 1,844.583.

In accordance with this invention provisions 1' are made for connecting an electrical pick-up for phonographs or telegraphone sound box either with the grid circuit or the plate circuit of the detector tube of the radio set, preferably the grid circuit. In order to connect conven- 2' iently the electrical pick-up with the radio set Without. altering any of the connections of the set, an apertured disk is used which fits the prongs of the detector tube between the tube and the contacts of the detector tube socket,

making electrical connection with either the plate prong or the grid prong. and also with the cathode prong when the usual AC tube is used or with one of the filament prongs if the old A battery tube is used.

3 The invention will be described in detail in connection with the accompanying drawing and.

hereinafter claimed. In the drawing: Figure 1 is a circuit diagram showing the manner of connecting a phonograph electrical pickup with the detector grid circuit of a radio receiving set in. accordance with my invention.

Figure 2 is an elevation view of the lower portion of a radio: detector tube with a disk in section to show contacts carried thereby for making connections with the pick-up in accordance with this invention.

Figure 3 is a plan view of the contact disk. Referring to the drawing, Figure 1 shows the detector and first stage of the audio amplifier only of any standard type of' radio receiving set employing a detector and one or more stages of audio amplification- The detector tube is generally designated by the reference numeral 11 and the first audio transformer 12. The set is supplied with electrical energy at the proper potentials, thesources shown being A and B batteries, and the detector circuit may be equipped with the usual grid leak resistance 14 and grid condenser 13.

In accordance with the present invention an electrical pick-up for phonographs or telegraphone sound box 15 is connected with the radio receiving set so: as to utilize the amplifier system thereof for reproducing phonograph selections. Since the detector tube will remain in its socket, and the circuit is not broken in any place, radio signals will come thru unless one of the radio frequency tubes is removed or, as will usually be the case, unless the set is detuned. While I have illustrated the set using both A and B batteries, the tubes usually employedwil'l. be the more modern AC tubes.

The electrical pick-up 15 is provided with a connecting cable shown as wires 16 which provide electrical connections for it with the grid circuit of the radio set by means of a plug 17 which is adapted to be inserted in a jack 18 the terminals of which are connected with the grid and the cathode terminals of the detector tube 11 preferably by means of the connector dem scribed in the next paragraph. Between the wires 16 of the connecting cable a small case 1-9 is provided in which is a bypass condenser 20 of approximately one microfarad and a va riable modulating resistance 21. This case 19 go is. a standard unit providing a blocking condenser which is necessary in case the reproducer is connected to the plate terminals of the detector tube instead of to the. grid terminal as preferred.

A connector for the electrical pick-up preferably includes a very simple form of connection which consists of a disk 22 shown in Figures 2 and 3. This connector or disk has four or fi-ve holes for receiving the prongs of the detector tube 11, depending on whether battery or AC tubes: are used. Inthe battery type, for example, one of the holes for the filament terminals such as the one receiving the prong 23. and either the plate or the grid hole, according as to whetherthe circuit of the pick-up is to be made with the grid circuit or plate circuit of the detector of the radio set, are placed contacts 24 which engage the tube prongs, and

lead wires

25 and 26 are connected to these contacts. No means; of fastening, the contacts to the disk or plate are shown sinceit is obvious that they may be cemented, rivetedv or clamped to the. plate or they may be fastened thereto by any other of the. means now well known to those skilled. in this type; of work, but the method and means for fastening them in place in no way involves'the present: invention and is not being claimed. The connector is very similar tov my ordinary adapter, but provides simple and efiicient means for making connection with the tube prongs with the tube in place in the tube socket without materially displacing the tube or taking up a great amount of space in the radio receiving set, as the disk 22 slips on the base of the detector tube and the leads are sufiiciently small and flexible to fiteasily between the tube and the old-fashioned socket should the latter be used. It is understood that the

lead wires

25 and 26 are of ample length soas to be used as flexible connections between the radio set and any accessories that may be used as, for example, pick ups and the like.

In Figure 1, the preferred arrangement, the phonograph pick-up or telegraphone is shown connected with the grid circuit of the detector tube, thus utilizing the amplifying efiect of this tube as well as the audio amplifiers and by means of its connection therewith excluding the passage of radio frequency currents to the detector tube. However, as above referred to, the connections could as readily be made with the plate circuit of this tube by arranging the contacts 24 of the disk for such plate circuit connections in which event the blocking condenser 20 in the case 19 is necessary. The standard case 19 with the condenser and variable resistance are shown in the circuit of the pick-up for connection with the grid circuit (Figure 1) the condenser although not essential in this circuit is not objectionable and is retained in the circuit as a matter of convenience as a part of the standard equipment.

What I claim is:

1. An adapter for tapping a circuit of a radio receiving set consisting of a disk and a conductor leading therefrom, said disk having apertures to fit over the prongs of a radio tube, and a single contact member carried by said disk, and

" arranged in one of said apertures providing a terminal connection for said lead conductor, said disk being relatively thin with respect to the length of the prongs of the radio tube, whereby the adapter may lie between the base of a pronged radio tube and its socket and permit the prongs of the tube to engage their usual socket contacts.

2. An adapter for tapping certain tube circuits of a radio receiving set, said adapter hav- -ing apertures to permit all the prongs of a pronged base radio tube to pass therethru and having a thickness which is small with respect to the length of the prongs thereby to permit the prongs to make their normal connections in the regular tube mounting in the radio set while the adapter is in operative position between the base of the tube and said mounting, said adapter comprising contacts adapted to engage the prongs passing thru said apertures and an insulating contact-supporting member to insulate and position said contacts, each of said contacts positioned to engage a predetermined single tube prong and to provide terminal connections for lead conductors from the radio receiving set.

3. An adapter for tapping a tube circuit of a radio receiving set comprising the combination of a conductor, a resilient contact and a substantially fiat insulating member adapted when assembled to lie between the base of a pronged tube and its regular mounting in a radio receiving set, said member being thin with respect to the length of the tube prongs and having recesses to permit the tube prongs to pass beyond the plane of said insulating member and to extend sufiiciently far to make their normal connections in the regular tube mounting; and said resilient contact being attached to said insulating member providing a terminal connection for said conductor, said contact positioned adjacent one of said recesses to engage a predetermined single prong of the tube.

4. An adapter for making a circuit connection with a radio tube of the prong base type while said tube is positioned in its regular mounting in a radio receiving set, said adapter comprising a contact-supporting member, apertured to permit all the prongs of the tube to pass thru said member to make their normal connections in a regular tube socket of a radio receiving set, and a contact carried by said member providing a terminal connection for a lead conductor, said contact positioned to engage a predetermined single prong of the tube.

5. A wafer adapter for making an electrical connection in parallel with certain tube circuits of a radio receiving set, comprising an insulating contact-supporting member apertured to permit all the prongs of a radio tube to pass therethru and to make their normal connections in the regular tube socket; and resilient contacts supported by said member providing terminal connections for lead conductors, each of which contacts is positioned on said member so as to engage a respectively different single prong of the tube passing through said member.

6. An adapter for tapping certain tube circuits of a radio receiving set consisting of a flat insulating member having apertures to receive the prongs of a radio tube, said member being thin with respect to the length of the tube prongs thereby permitting the prongs to extend there through and engage in their regular sockets in the receiving set, and a contact member in one of said apertures, a separate contact member in a second aperture, said contact members pro-' viding terminal connections for lead conductors, said two contact members each projecting into said apertures in a downwardly extending direction so that as a prong enters the aperture it will force the contact member toward the wall of the aperture.

7. An adapter for tapping certain tube circuits of a radio receiving set while saidtube is connected in its normal operating position, comprising a wafer like body, said body having apertures to permit tube prongs to pass therethru and to make their normal connections in the rgular prong sockets, and resilient contacts adapted to engage the sides of the tube prongs passing thru said apertures, said contacts providing terminal connections for lead conductors.

8. An adapter for tapping certain tube circuits of a radio receiving set, said adapter comprising a wafer like body of insulation apertured to permit tube prongs to pass therethru, and resilient contacts carried by and so positioned on said body as to engage the sides of respective selected prongs of the tube, a portion of said adapter being adapted to lie under a tube base, said portion being thin with respect to the length of the tube prongs so as to occupy a small axial space under the tube whereby when in operative position it permits all the prongs of the tube to engage in their usual prong sockets in a radio set, said contacts providing terminal connections for lead conductors.

9. An adapter for tapping certain tube circuits of a radio receiving set consisting of an insueach projecting into said apertures in a downwardly extending direction so that as a prong enters the aperture it will force the contact member against the wall of the aperture.

LE ROY J. LEISHMAN.