US1568632A - Radio receiving apparatus - Google Patents

Description

Jan. 5 1926.

I L. Q. SLOCUMB RADIO RECEIVING APPARATUS- -Fi1ed Jan. 2, 1924 2 s t -sh t 1 Jan, 5 1926.

L. Q. SLOCUMB RADIO RECEIVING APPARATUS Filed Jan. 2. 1924 2 Sheets-Sheet 2 lib reamed Jan. 5, 1926.

UNITED STATES LLOYD Q. SLOCUMB, OI FERGUSON, MISSOURI.

RADIO RECEIVING APPARATUfi.

Application filed January 2, 18%. serial No. 683,887.

To all whom it may concern:

Be it known that I, LLOYD Q. SLocUMB, a citizen of the United States, and a resident of Ferguson, St. Louis County, Missouri,

have invented an Improvement in Radio" Receiving Ap aratus, of which the following is a speci cation.

This invention relates to radio receiving apparatus, and with regard to certain more specific features, to apparatus for amateur use.

Among the several objects of the invention may be noted the provision of an accurate and simplified control; and the provision of a simple and inexpensive device, readily installed and calibrated. Other objects will be in part obvious and in part pointed out hereinafter.

The invention accordingly comprises the features of construction, combinations of elements, and arrangements of parts, which are exemplified in the constructions herein: after described and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings, in which are'illustrated one or more of various possible embodiments of this invention,

Fig. 1 is a plan;

Fig. 2 is a vertical transverse section on the lme 22 of Fig. 1; 1

Fig. 3 is a, fragmentary face view coil;

Fig. at is a diagram;

Fig. 5 is a diagram of a modification;

Fig. 6 is a plan of a modification; and

Fi 7 is a verticaltransverse section on the line 7-7 of Fig. 6.

Similar reference characters indicate correspondin 7 parts throughout the several of'a -views of t e drawings.

Referring now more particularly to Figs. 1 to 4 of the accompanyingdrawings, there is illustrated at 1 a top panel 1 enclosing a box 3. The panel is slotted as at 5 to re ceive a vertical shaft 7 extending from the condenser '8 11 through the slot 5, and adapted to receive a handle such as the Mob 1?. bearing a scale 13. I

its will be seen hereinafter, this scale may ordinariiy be calibrated by wave lengths or names of broadcasting stations.

The condenser 9, which is a variable the circuit comprises fined plates 15 and movahle plates 17, and is mounted slide SS has preferably fifty turns in it.

whole, in guides 19 secured to the top panel 1 by suitable means, such as screws 21 r (Fig. 2

Rotation of the knob 11 causes rotation of the movable plates 17 with respect to the fixed plates,15, thereby varying the capacity of the condenser.

Movement of the knob 11 parallel to the panel, throughout the range of travel permitted by the slot 5, causes the condenser to move bodily. Thismovementdoes not affect the internal capacity of the condenser as an instrument,- but is primarily for the purpose of varying the relative position of two inductance coils 23, -25, constituting another type of variable of the circuit.

The coil 23 (Figs. 1 and 3) is fixed in position. This coil comprises a spider 27 of insulating material, on which is wound a grid coil SS, upon the outside of which is wound an aerial ground coil AG. The latter coil has several ta s. A preferred arrangement of taps is, t ree taps on the first turn of the aerial ground coil, then a single turn and a tap and then a tap every two turns for a total of sixteen turns. The coil coils are preferably Number 24 double cotton covered copper wire.

The movable coil 25 (Fig. 1) may be termed the plate coil or tickler coil. This coil is preferably of the same construction as the coil 23, and has preferably about forty turns of Number 24 double cottoncovered copper wire.

The two coils 23, 25 are both horizontal and are spaced about an inch and a quarter apart. The fined coil 23 is secured to the underside of the panel 1. The movable coil 25 is ivotally mounted at 29 and is adapted to e rotated about said axis 29, in a horizontal plane, from the lower dotted position in l, to the upper dotted position in said figure, so as tovary the interaction between said coil and the first coil 23. Such rotation oi the movable coil 25 is effected through a link 31 pivotally con nected to a lever 33 which in turn is pivotally mounted upon the condenser shaft 7 lever 33 is preferably of insulating material.

ovement oi? the knob 1.1 and shaft 7 tod rigl'it (Fig. 1} thus causes moveof the c 25 from its lower dotte (Fig. i

Both

its upper dotted I tion (Fig. 1) thereby bringing the coils 23 and 25 into closer proximity, thereby.

alternating the intensity of the current in the telephones hereinafter described.

The grid condenser is connected to the inner end (Fig. 3) of the coil SS.

Thus by operating the knob 11, the intensity may be adjusted by longitudinal movement of the rod, and the wave length may be adjusted by rotation of the knob. A second knob 35 is shown in Fig. 1, and is adapted to control the rheostat 37 '(Fig. 4) to vary the intensity of current in the filament 39 of the tube 41 (Fig. 4).

On one side of the box 3 are shown (Fig. 1) binding posts 43 for B battery and binding posts 45 for A battery, 47 for ground,

and 49 for taps of the aerial ground coil.

The aerial 53 is connected to one oranother of the taps 49- as may be desired, de-

ending upon the number of turns desired or the aerial ground circuit AG in the coil 23. Taps additional to those shown at 49 maybe provided as required, in order to take care of the desired number of taps from the aerial ground coil.

Binding posts 51 are shown on the other side of the box, for the telephone or other translating device circuit.

In Fig. 4 is illustrated diagrammatically a preferred system of wiring. The aerial .53 runs to the aerial ta .A (which is some one of the posts49 of ig. 1) extending to the aerial ground coil AG. The other end g f the coil is grounded as indicated in This aerial ground coil is close-coupled, as indicated in 'Fi 3, to the grid coil SS. The rid coil SS has bridged across it the varia 1e condenser '9' Fig. 2), and is in series with a grid lea 55 bridged b a grid condenser 57, the circuit then leading to the grid 59 of the tube 41. v

The filament 39 of said tube 41 is connected, through the rheostat 37, to the negative side of the A battery A, the positive side of which is connected to the lower lead (Fi 4) from the id coil. The latter lea is connected to t e filament 39 and to the negative side of the B battery B.- The negativevside oi the B battery B is connected to the translatin device illustrated conventionally as a hea set 61, the circuit then extending through the movable coil 25 and thence to the plate 63 of the tube 41.

In the modification illustrated in Fig. 5, the B battery is omitted, and a coil 65 of about one hundred turns of Number 24 double cotton covered co per' wire is inserted in the translating evice circuit that includes the movable coil 25. The circuit is otherwise the same as in Fig. 4.

In Figs. 6 and 7 is illustrated a modified control for the movable coil 25. In this embodiment of the invention the fixed coil (wave lengths an 23 is vertical, and the movable coil 25 swings from a vertical position about one and one-quarter inches away from the fixed coil 23, clockwise (Fig. 7) to a position at an angle to the vertical, as indicated in dotted lines in Fig. 7. This elevated position of the movable coil is also indicated in Fig. 6.

The lifting of the coil is effected by the longitudinal movement of the knob 11 in the slot 5 in the anel 1-. For this purpose, a piece of cord 6 is connected to the lower end of the movable coil 25 and passes through an eye 69 and thence to the end of a lever 71 pivoted to the panel at 73 and at its other end pivotally connected to a link 75 which is pivotally secured to the condenser 9.

In this modification, as in 'theconstruction first above described, the extent of cooperation between the fixed and movable coils, and therefore the intensity of current in the translating device 61, is varied by moving the knob 11 rectilinearly in the slot 5, whereas rotation of the same knob serves to tune the apparatus to the desired wave length.

For calibration urposes, the scale indicia d/or names of broadcasting stations) are, preferabl on a scale. disc 13 which is secured to the nob 11, and the knob is detachably connected to the shaft 7 by means of a'set screw 14 (Fig. 2). In the initial tuning of the set, the operator tunes the set to receive some known broadcasti'iig station, the name or wave length of'which is on the dial. Then, if in the position for receiving said station, the name or wave length of that station is not at the station line 77 on the panel, the operator loosens the set screw 14, and, without rotat- I ing the shaft 7, rotates the knob 11 until the name or wave length of said station is o posite the station line 77 on the panel.

e then tightens the set screw. The appardus is now calibrated for all of the stations on the dial. Y

In view of the above it will be seen that the several objects 01- the invention are achieved and other advantageous results attained. I As many changes could be made in carrying out the above constructions without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

I claim:

1. A compound radio adjustment comprising a fixed coil, a movable coil positioned in operative relation thereto, means movable substantially parallel to a panel for mountin thereof adapted to move said movable 00' with respect to said fixed coil, a

.Ja-riable condenser, said'means being mov- I first means affecting only the position of on which said handle is said movable coil.

2. In a radio receiving set, a compound adjustment for variables of a circuit comprising a single handle, a panel, means for mounting said handle on said panel for rotation to vary one of said variables, and for simultaneous movement in a predetermined path to vary another of said variables, said handle being adapted to be moved in either of said ways independently of the other movement.

3. In a radio receiving set a compound adjustment for two difierent variables of a circuit governed by different instruments comprising a single handle, a panel, means for mounting said handle on said panel for rotation and simultaneous movement-in a predetermined path arallel to said panel, said handle being a apted to be moved in either of said ways independently of the other movement and, when desired, .without said other movement.

4. In a radio receiving set, a compound adjustment for variables of the circuit, said adjustment comprising a handle, a support mounted for rotation and simultaneously for movement in another path, a variable condenser having an element secured to the handle for movement therewith in said path and having an element rotatable with the handle whereby rotation of the handle varies the capacity of said condenser; a secondary coil and a feed-back coil, one movable relatively to the other, and means whereby the movement 0 said handle in said path effects relative movement of said coils 5. A compound adjustment for two radio adjustments comprising a rotatably operable device slidably mounted, said device varying the capacity of a variable condenser when it is rotated, two coupled coils, means whereby when said device is slid the coupling between the coils will be varied, said device being capable of simultaneous but independent rotatable and sliding movement, both movements taking lace substantially parallel to a panel on which the adjustment is mounted.

6. In a radio receiving set, a tuned secondary coil, a feed-back coil, one of said coils being movable relatively to the other to effect a variable coupling between them, a variable condenser adapted to be varied by rotation of one of 1ts elements, and adapted to move bodily as a whole in a predetermined path, a control movable with said condenser in said path and connected to said movable coil whereby movement of said control in said path varies the relative position of said coils, said control being also connected to the rotatable part of the condenser whereby rotation of said control varies the capacity of said condenser, said rotation and said other movement of said control being capable of being effected simultaneously. v

7. In a radio receiving set, a tuned secondary .coil, a feed-back coil variably coupled thereto, one of said coils being movable relatively to the "other, a tuning element, a support on which said element is mounted, a connection between said element and said movable coil whereby bodily movement of said element varies the relative position of said coils, and a control for adjusting said element and for movlng said element bodily, said adjusting movement 'and bodily movement being capable of f. being effected simultaneously.

In testimony whereof, I have signed my name to this specification this 31st day of December, 1923.

' LLOYD Q. SLOCUMB.

Images