US2055431A - Radio receiving apparatus - Google Patents

Description

sea. 22, 1936.

RADIO RECEIVING APPARATUS Filed Dec 7, 1955 BET. lsr AUDIO Q -i /5 y a INVENT OR. lfy- [aw/w 'AfiK f) BY I a Z ATTORNEY.

Patented Sept. 2 2, 1936 RADIO RECEIVING APPARATUS Edmond Peter Garvey, Springfield, Mass, as-

signor to United American Bosch Corporation, Springfield, Mass, a corporation of New York Application December I, 1935, Serial No. 53,361

3 Claims.

This invention relates to radio apparatus and more particularly to a combination unit and associated circuit. In the past it has been customary to provide individual units in radio circuits and connect them in circuit by numerous wires and solder joints. All these component parts require considerable space and render it difficult to secure receiver designs which are satisfactory in physical arrangement and electrical performance.

An object of this invention is to provide radio apparatus which is simple in construction and more efficient in operation.

Another object is to provide radio apparatus which is more compact in design and which requires less associated wiring.

A further object is to provide radio apparatus which is more economical in production and installation.

Other objects and advantages will in part be set forth and in part be obvious when the following specification is read in connection with the drawing, in which:

Fig. 1 is a front elevation of the combination transformer and multiple condenser unit; Fig. 2 is a top view showing the arrangement of the various condensers; Fig. 3 is an enlarged sectional view of the multiple condenser unit taken on line 33 of Fig. 2; and Fig. 4 is a circuit diagram showing one application of the combination transformer and condenser unit.

Referring in more detail to Fig. 1, the numeral I represents a wooden dowel rod carrying the high frequency transformer windings 2. The lower end of the dowel rod I carries a fibre mount 3 for the terminals 4. The upper end of the rod I carries a moulded ceramic mount 5 secured by a non-magnetic screw 6 as shown in Fig. 2. The upper surface of the base 5 is provided with moulded abutments I, I, 8 and 8'. Between the abutments I and I is arranged a multiple condenser consisting of a compression type variable condenser and a relatively fixed capacity condenser. The condenser structure is shown in greater detail in Fig. 3. An arched, resilient compressor plate 9 is provided at one end with a downwardly extending connector lug ID. A first intermediate plate II has a connector lug I2 depending from one side thereof near the end. The second intermediate plate I3 has a connector lug I4 which is designed to contact the lug ID of the compressor plate 9. The bottom plate is provided with a connector lug I6. Between each plate is an insulating strip I1 of mica or any suitable material. Centrally of each member of the condenser stack is a hole through which a compression screw I8 extends, as shown in Fig. 1. A washer I9 provides a thrust surface against the compression plate 9. It will be apparent that plates 9 and I3, being connected together, form one side of a variable condenser, with the first intermediate plate II forming the other side. A second condenser is formed between plates I 5 and [3 which varies somewhat in value under different degrees of compression, but which provides sufficient capacity for by-pass and other non-critical uses. Between the abutments 8 and 8' (Fig. 2) is located another three plate variable condenser 20 which is similar in construction to the previously explained variable condenser formed by plates 9 and I3 and plate I I. A fixed resistance 2| may be soldered directly to the connector lugs I0 and I4 as shown in Fig. 1.

A circuit is shown in Fig. 4, to which the described unit is particularly suited. From a suitable source, a high frequency signal is applied across the primary of transformer 2, which is tuned by the variable condenser 20. The secondary of transformer 2 is connected between the diode plates 22 and cathode 23 of a combined detector and first audio tube 24, commercially known as type I5. The secondary of transformer 2 is tuned by the variable condenser formed by plate II and plates 9 and I3. The plate I5 is connected to ground and forms with plate I3 a condenser which acts as a filter to by-pass to ground the unwanted component of rectification in the diode circuit. Such condensers are usually provided as a separate unit of considerable bulk and requiring both some form of support and considerable wiring. Since the remaining portions of the diagram are well known and form no part of the present invention, they will not be explained in further detail. By proceeding in the manner described a multiple condenser unit of greater number of sections may readily be procured without appreciably increasing the size of the combination.

It will be obvious that many alterations and modifications may be made in the described invention by anyone skilled in the art without departing from the spirit and scope of the invention as defined in the following claims.

What is claimed is:

1. A radio transformer comprising an insulating core, windings on said core, a ceramic support secured to one end of said core, two tuning condensers mounted on said support and connected to said windings, and a third condenser supported adjacent one of said tuning condensers having one side in common therewith.

2. A radio transformer comprising an insulating core, windings on said core, a. ceramic support secured to one end of said core, abutments formed on the top surface of said support, a stack having condenser plates retained in alignment by said abutments, and means interconnecting said plates whereby .a portion thereof forms one condenser and the remainder forms a second condenser.

and

3. A radio transformer comprising an insulating core, windings on said core, a ceramic support secured to one end of said core, abutments formed on the top surface of said support, a

stack comprising at least four condenser plates 5 a and being retained in alignment by said abutments, and connections whereby three of said plates form one condenser with the remainder forming a second-condenser having one side in common withsaid first --condenser.

EDMOND PETER GARVEY.

DISCLAIMER 2,055,431.Edm0nd Pete?" Garvey, Springfield, Mess. RADIO RECEIVING APPA- RATUS. Patent dated September 22, 1936. Disclaimer filed April 4, 1938, by the essignee, United American Bosch Corporation. Hereby enters this disclaimer to claims 1 and 2 of said patent.

[Ofiicial Gazette April 26, 1938.]

DISCLAIM ER 2,055,431.Edm0nd Peter Garvey, Springfield, Mass. RADIO RECEIVING APPA- RATUS. Patent dated September 22, 1936. Disclaimer filed April 4, 1938, by the assignee, United American Bosch Corporation. Hereby enters this disclaimer to claims 1 and 2 of said patent.

[Ofiicial Gazette April 26, 1938.]

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