US2642026A - Tuner indicator and control - Google Patents

Description

June 16, 1953 I R, c, c so 2,642,026

TUNER INDICATOR AND CONTROL Filed Sept. 2, 1950 3 Sheets-Sheet J.

INVENTOR. Rea/54972 C3 Caz r2607:

June 16, 1953 R. c. CARLSON 2,642,025

TUNER INDICATOR AND CONTROL 5 Sheds- Sheet 2 Filed Sept. 2, 1950 I" 34- I mvsm bR.

:3 Reuken C Garrison June 16, 1953 R. c. cARLsoN TUNER INDICATOR AND CONTROL 3 Sheets-Sheet 3.

Filed Sept. 2, 1950 VENTOR.

QZZ

Patented June 16, 1953 TUNER INDICATOR AND CONTROL Reuben C. Carlson, River Grove, Ill.,'assignor to Admiral Corporation, Chicago, R1,, at corporation of Delaware Application September 2, 1950, Serial No. 183,049

Claims. (Cl. 116-124.2)

posed and obscured positions.

invention the radio receiving set comprises a chassis housed in a cab- According to the present inet in one of the walls of which is a slot which is ordinarily closed by a portion of the dial when the set is not in use. From its obscured position within the cabinet, the dial is adapted to be moved to an exposed position, outside of the cabinet, bythe agency of some biasing medium in response to movement of a handle or button on an external surface of the cabinet, the button being in connection with a trigger mechanism for retaining the dial in obscured position. Concurrently with movement of the dial to its exposed position a pointer, in cooperative association with the dial is released and moved by a resilient medium to the position it last occupied with respect to the dial-before said dial was removed from its exposed to its obscured position. Means is also provided for opening a switch in a power circuit for operation of the radio receiving set when the dial isrmoved to its obscured position and closed when the dial is releasedto its exposed position. Although radio receiving sets havinguncovered dials and'pointers are known to the prior art, the dials, pointers and controls of portable radio re ceiving sets have been protected by windows, doors or lids as a safeguardagainst injury due to contact with objects likely to mar the'appearance of or bend or fracture the dials orv pointers. These precautions were also taken to exclude dust or dirt not only from the dials and pointers but.

also from the vital parts of the radio receiver.

By means of the present invention it is possible to manufacture a portable radio receiving set in which the dial and pointer are fully protected when theset is not in use but which does not require the use of hinged members for such protection. By eliminating the need for doors, lids or window panes it is possible to construct such an apparatus at a lower cost. Furthermore, the

mechanism enables the use of a relatively large dial and station indicator mechanism on a relatively small radio without unnecessarily enlarging the radio or detracting from its appearance.

2 Fig. l is a view, in front elevation, showing my improvedradio receiving set as it is whennot in operation;

Fig. 2 is a View similar toFig. 1 but showing the receiving set as it appears while. in operation;

Fig. 3 is a fragmentary vertical sectional view, drawn to an enlarged scale, and taken on line 3-3 of Fig. 1, the cabinet having been removed;

Fig. 4 is a fragmentary sectional view, drawn to to an enlarged scale, and taken on line 4-4 of Fig. 3;

Fig. 5 is a fragmentary perspective view of some of the parts shown in Fig. 4; v

Fig. 6 is a fragmentary elevational view of the back of the chassis, parts being broken away to reveal the'structure of other parts;

Fig. '7 is a fragmentary elevational view of the front of the chassis, parts being broken away to reveal the structure of other parts;

iFig. 8 is a top plan view of the radio receiving se Fig. 9 is an exploded view showing of the cowl structure; and

Fig. 10 is a similar view of the pointer mechanism of Fig. 5.

In Figs. 1 and 2, wherein for the purpose of i1- lustration is shown one embodiment of the invention, the reference character 245 used to denote the cabinet of a radio. receiving set' of the so- The radio receiving set includes novel means bywhich the current to operate it is turned on regardless of whether the set is operated by batteries, which may be housed in the lower part of the cabinet, or by current ordinarily available in the home at 110 volts. This is made available by manually depressing a button 8. Immediately followingdepression of button 8, a dial 9 and pointer l I, normally concealed within the cabinet, make their appearance whereupon the pointer is adapted to be moved over the dial by turning the knob 6 to tune the set to whatever broadcasting station is desired. The dial and pointer are adapted to be rocked between their obscured and exposed positions, about the axis of-the knobs 6 and l, by means to be later described.

Other advantages of the invention will be apparent from the following specification when considered in conjunction with the accompanying drawings in which:

V In order to understand the unique operation 7 of my radio receiving-set, reference should be made to Fig. 3 wherein it will be noted that the apparatus involves. use of a frame 12 which is L-shaped in transverse vertical section, the

e frame being preferably of sheet metal which is bent to the formation indicated and include: a vertical wall l3 from the base of which a horizontal wall [4 extends laterally. The walls l3 and i4 afford rigid support for a tuning element, such as a variable condenser Hi, from which a rotary or operating shaft l'i extends. A bushing or bearing 18, concentric with the shaft H, is rigidly fixed, at one end, to the wall i3. A hub l9 on the dial 9 is journaled in the bushing i8 which engages the back of the dial to prevent axial displacement in one direction. Displacement of the dial axially in the opposite direction is resisted. by a spring wire clip 2| in pinched engagement with an annular groove 22 on the end of hub is. As constructed, the

diameter of shaft I! is substantially less thana bore 23within this hub, through which the shaft is in extension. Consequently, hub I 9 affords no bearing relationship for the shaft H. The pointer l 1, preferably of some suitable plastic material, is journaled on a bushing 24, of metal supported by the shaft !7.

The shaft ii is also tubular and is rotated in response to rotation of a manually operative or control shaft 2% which extends within shaft H. In greater detail shafts ll and 25 are drivingly coupled together by a speed reduction mechanism within the condenser It in a manner which will not be described since it does not form a part. of the present invention. This speed reduction between shaft 2e and shaft H is such that when the knob 6, carried by shaft 25, is turned through eight revolutions, for example,

the shaft 57 is rotated through one revolution.

The nature of a state of driving relationship between the pointer I l and bushing 24 will be dealt with hereinafter.

In order to understand the mechanism comprehensively, it is advisable that the structure of the dial be. first considered. It comprises a web portion 2?, preferably of sheet. metal, which is rigidly. fixed to the end of the hub l9 in any convenient manner. Opposite edges of web portion 2'5 are provided with flanges 23. which are arcuate of the axis of bearing E8 to which the flanges are also parallel. Flanges 28. continue to a second flange 2%} (Fig.7) describing an arc of considerably greater radiusthan the. radius of the flanges 28 while. from the edgeof the. web opposite flange 29 a third and straight flange 3| (Fig. 4) is struck laterally thereof. The latter flange is capped by a cowl32 which is preferably of some suitable plastic material such as Bakelite. An external linear surface33 of the cowl is flush with adjacent surfaces 34 at the top of the cabinet (Figs. 1 and l). Adjacent either of itstwo corners the cowl 32 is provided with a boss 35 which is threaded to receive a screw 35 passing through the web portion 27, and additionally, through a calibrated plate 31, this latter member bearing indicia denoting frequencies within the broadcasting range. Calibrated member 3? extends to the inner'surfaces of flanges'Zii, 29 and 3|. It is also apertured by a clearance hole 38 for the bushing 24 to pass through. Each of. the flanges 28, on the web 21, is sandwiched between arcuate flanges 39 and on the ends of the cowling to resist endwise displacement of the cowl from the dial and this displacement is further resisted since the calibrated member 3'! is pinched between flanges 4i and web 2'? by clamping action of the screws 38. The flange 3! extends between lateral ex- 7 tensions 42, of flanges ll and the flanged top 4 33 of the cowling to facilitate assembly of the parts and retain them in their predetermined relationship to each other.

Although the pointer H is adapted to swing over the dial 9 when the receiving set is in operating position, the position of the pointer is governed by the cowling 32 when the set is inactive as indicated in Fig. 1. As is best shown in Figs. 4 and 5, the pointer H includes a drum or annular portion 43 in extension from a disc portion M which is spaced from the hub 19 by an annular flange 45 on the end of bushing 24. A hub portion 4?, on, the disc portion M, is cut away at 48 thereby providing shoulders 49 and 5! spaced from a plane passing through the diameter. of hub 43 by a distance equal to approximately half the diameter of a set screw 52 threaded in the bushing 2 Set screw 52 performs the function of rigidly securing bushing 24 to the shaftl'! and also acts as a stop for engagement with. the shoulder 49 when the receiving set is. in. operation. The screw 52 and pointer H are urged to this relative position by aspring 53, coiled about thehub 4? and having its ends anchored to screw 52 and the pointer ii respectively, to bias said pointer clockwise (Fig. 4). However, regardless of the position the pointer ll occupies while it and the dial are in their exposed position the end of the .pointer is adapted to be engaged by an internal flange 54 of the cowl during the course of, manual rotation of the dial to its obscured position within the cabinet 2 and although shoulder 48 is carried away from the set screw 52in the course of this operation. the force of the spring 53 immediately returns the shoulder to a state of engagement with the screw when the dial is rocked upward again to its exposed position. It is obvious that this operation of moving the dial and pointer away from and back totheir exposed position may be carried out without disturbing the angular position of shaft H, and consequently the set screw 52.

As. has beenpreviously indicated, the dial 9 is biased away from its obscured position. This makes necessary some means for retaining the dial in its obscured. position within the cabinet. The latter means comprises a trigger mechanism and includes a latch lever 5e (Fig. 7) pivoted at 5? to an adjustment arm identified in its entirety by the character 58 and bolted tothe base portion M of chassis l2. Lever 5b includes a lateral arm 59 to which a tension spring ti is anchored to bias the lever counterclockwise into engagement with a stop provided by 2. lug 62 struck. outwardly from the wall 53. Near its upper end, the lever 56 is notched to provide a shoulder or stirrup 63. As the dial is rotated. counter-clockwise (Fig. 7) to its closed position, a striker member or ear 54 struck outwardly from the web portion 2'! of the dial'engages the lever 56 and is caught by the shoulder 63. The lever 56 is cooperatively associated with a slider or trigger member as which has a slot 51, extending longitudinally thereof. A. pair of headed studs 63 fixed to the wall l3 extend through the slot El so that the slider is slidably anchored for vertical movement within the limits permitted by the studs and slot. The slider 65 is normally retained in the position indicated regardless of the position of dial 9. This is effected by a lug 8%, struck outwardly from one side of. the slider, which engages an ear "H at the end. of lever 58 thus causing the slider 68 to be raised by the spring 6!. The opposite side of slider 6t bears a flange 52 which continues uply, spring 82 ward from the slider and is surmounted bythe button 8 which, in turn, passes freely thru the top wall 34 of thecabinet. It will now be aplever I3 is pivoted at I4 to the chassis wall I3.

The lever I3 bears a follower 16 (Fig. 7) in extension forwardly from the swingable end thereof through a clearance slot 11 arcuate of the pivot 14. The web portion 2! of the. dial is distended at offset portions I8 (Fig, 3)v against which a cam 19 is'clamped by riVetsBI. The. cam I9 is apertured by a clearance opening 89 through which the bushing I8 passes. This structure enables the cam 79 to be operated in close-proximity'to the wall I3 so that the camis adapted to cooperate with the follower 75. "Partly responsible for this cooperation is a tension spring 82 (Fig. 6) anchored to an car 83 on the lever 1-3. The surface of the cam 19 against which the follower I5 bears is formed in aspiral about the axis of the cam. The pressure of the spring 82 exerted through the follower I6, therefore urges the cam to rotate until the follower engages the lowest point of the spiral.

It is desirable that the rotative force of the cam formoving the dial 9 from its lower to its upper extreme position be applied to the dial in a specializedmanner. Since the dial 9 is eccentrically mounted, it offers its greatest resistance to being swung upwardly at the halfway point between its two extreme positions where the full weight. of the overhanging upper part is effective as a moment about the pivot axis. Furthermore,

more force is needed to start the dial moving from rest in its lowermost position than is necessary once it has acquired inertia. Finally, by

the time the dial has approached closely its upper-position the external force applied to it may be comparativelyslight or even lacking to avoid the need for buffer means to absorb the impact. The contour of cam I9 is therefore made to conform with these needs. Follower I8 said arm bears at one of its ends a finger 94 in engages the cam at a point in close proximity to its point of greatest rise when the dial is in its lowermost or obscured position. Concurrentis under its greatest tension. By the time spring 92 has moved the cam to a point Whereon thefollower is at its lowest point, the

tension or only just enough spring is under no the resistance offered bylthe tension to overcome toward itsupper position gather adequate in' 'ertia to overshoot its mark, an additional and reverse rise 86 on the surface of cam I9 is adapted to increase the tension in spring 82 to swing the dial backward to its intended position. Amore positive stop,'provided by an abutment surface 8"! at the end of rise 95, is adapted to be engaged by follower It should the inertia in the moving parts be adequateto carry the cam portion 86 over the follower far enough. Regardless of follower to movementof the cam thereover as,

surface 81! inengagement with the follower, the tension of spring 82 together with the rise 86 is adequate to return a lowermost point 88, on cam 19, into engagement with the follower concurrently with the dial coming to rest in its uppermost position. The point 83 is somewhat depressed from the smooth spiral of the cam in order to provide a detent designed to hold the dial in its proper calibrated position.

In order that dial 9 may be moved from its uppermost to its lowermost position, it is grasped and moved manually counterclockwise (Fig. 7) until the lug 64 rests on the stirrup 63. In the course of this-operation, lug 64 is first carried into engagement with a" cam surface 89, on the side of lever 56, to move said lever against spring 5| untilthe stirrup '63 is permitted to be snapped under the lug64. In the operation of moving the dial to its obscured position, a stop surfaceyor shoulder 9|, on-cam'19, may be carried into engagement with follower 16 to limit further rotation of the dial after lug 64 has been carried past the stirrup 63. In this event, the spring 82 returns the lug 64 to holding engagement by the stirrup 63, r

In order that the angularposition of dial 9 in its obscured position may be minutely varied so that the ends of its straight surface 33 may be in line with the surfaces 34 of the cabinet, adjustment means for the latch lever 55 is provided. It includes the lever 58 and a cap screw 92 to anchor the lever to chassis I2. Screw 92 passes through a resilient washer 93 and holds the lever 58 resiliently in the position shown (Figs. 6 and 7). A second screw 95 passing through the lever 58 is threaded into the chassis'base I4 to provide adjusting means for the device. A second resilient washer I00 may be used to supplement the action of the washer 93. To anchor arm 58 against forces tending to rotate it about the screw 92,

extension upwardly through an aperture 96 in the chassis base wall I4. It will be apparent to those skilled in the art that the lever 58 could be permanently fixed to the chassis instead of using the screw 92. In that case, the springiness of the lever 58 would provide the biasing of the lever against the head of screw 95. 1

Movement of the lever I3 's responsible for a flow or interruption in a fiow of electric current for operating of the radio receiving set. This is carried out as follows: Attached in any suitable manner to the chassis wall I3, beside lever I3, is a switch 91 (Fig. 6), the structure of which forms 'no part of the present invention and consequentis'of such a nature th'atwhen its arm 99 is moved slightly past a point midway between its two extreme positions, it immediately snaps to its-nearest extreme position. In the position in which arm 99 is indicated by full lines, the switch is open. The arm 99 is bifurcated to provide a pair of ears IIII and I92, between which a lug I03 on an arm I04, of lever I3 extends. This lug I93 in the course of its motion engages the ears IUI and I02, and causes the opening or closing of the switch dependent on the direction of motion.

The chassis wall I3 provides support for a volaesaoee ume control rheostat. (to (Fig-6) of a construction old to the rheostat art: and may be coupled to wall 13 in any suitable manner. .The rheostat I06 bears a shaft I01 (Fig. '7) which extends through wall l3 and carries, pinned thereto, a grooved pulley [08. On the shaft 26 (Fig. 3), is journalled a grooved pulley 199 which has a hub portion I l l on which the knob is drivingly fixed. Turning motion of knob l is communicated to the volume control I06 by a belt, cable or cord H2. which, in addition to being looped completely around the pulley M8, is positively coupled thereto by a lug I08. The cord H2 islikewise looped around but isnot positively coupled to the pulley H391 In orderto avoid. strong lateral forceson the condenser shaft 26, it is necessary'to provide an idler puliey iii? rotatably mounted a on a bracket H5 on the chassis wall. The cord. H2 passes from the pulley I99 around this idler H and'thence to a tension spring M3 joining the ends of the cord. Because of the frictional driving relationship between the belt H2 and pulley The knob i is also supported by shaft 2fi-which is formed with a cutaway or flat H4 complementary to an internal flat I E5 on the hub l H of the knob. The hub. I H is counterbored at H8 to provide a clearance for the hub l H sothat knob 6 may be in, close proximity to knob '5.

Having thus described my invention, I am aware thatnumerous and extensive departures may be made therefrom Without departing from the spirit or scope of my invention.

I claim:

1. Radio receiving apparatus comprising a frame housed within a cabinet having a slot in the top thereof, the apparatus also including a shaft adapted to be turned to control the apparatus, means in connection with the frame by which the dial is pivotally supported for rotation aboutthe shaft between an upright position and through. the slot to an inverted position within the cabinet, said dial being adapted to close said slot when in the inverted position, mechanism carried by the frame by which the dial. is releasably retained in one of the positions to which it is adapted to be moved manually, and means on the frame for urging said dial to its other. position when released from said one position.

A plate possessing the characteristics of a dial for association with radio tuning apparatus, a hub extending normal to the plate, a straight flange in normal extension from one edge of the,

plate adjacent the hub, an arcuate flange in normal extension from another edge of the plate spaced to a greaterv extent fromthe hub than the straight flange is spaced therefrom, said arcuate pending flanges embracing at least a portion of 8 the straight. flange. andv portions ofat least" one of the-curved flanges. I

5. In a tunable apparatusfor tuning aradio having a sound reproducing apparatus having ashaft by rotation ofwhichsaid apparatus is tuned; the combination of, indicating means including a pointer by which the position of the shaft is indicated, bearing means on the shaft, said pointer being journaled on said bearing means, first stop means on said bearing means, second stop means on said pointer, resilient means about the axis of the shaft and anchored to the pointer and said bearing means to bias the respective stop means into engagement with each other there -y providing a predetermined position for said pointer with respect to the shaft when the sound reproducing apparatus is in operation, said pointer'being adapted to be swung away fromv its predetermined position with respectto the shaft when operation of the apparatus is discontinued and returned to said predetermined position when operation is resumed without variance of said predetermined position.

6. In a tunable apparatus comprising a rotary shaft on rotation of whichsaid apparatus is tuned; the combination of, indicating means ineluding a pointer in association with the shaft, bearing means on the shaft, clamp means'in connection with the bearing means by which said bearing means is in fixed relationship to the shaft, said pointer being journalled on said bearing means, projection means on the pointer, said projection means being adapted to limit the angular movement of the pointer to a predetermined position with respect to the shaft on engagement with said clamp means, and resilient means anchorcd to the clamp means and pointer to bias said pointer into its predetermined position when the sound reproducing apparatus is in operation, said pointer being adapted to be rocked away from its predetermined position when operation of the apparatus is discontinued, said pointer be-v ing returnable to its predetermined position on resumption of operation of said apparatus without angularly moving the rotary shaft.

7. In a radio receiving set comprising a shaft by rotation of which a selection of broadcasting stations is made; the combination of, indicating means including a dial andpointer means for identification of the station selected, said dial being angularly movable from an upright position, said pointer means comprising a hub, and a hand portion integral with the hub, a bushing on'the shaft, a set screw threaded in the bushing for clamping thereof to the shaft, said screw also being adapted to resist axial displacement of the hubin one direction by engagement with said hub, a parti-cylindrical. hub section continuing from said'hub, and a spring coiled about the hub, the respective ends of said spring being anchored to'said hub and the set screw to bias the hub sec tion intoengagement with said set screw thereby providing a predetermined position for the hand with respect to the shaft when the dial is in an upright position, the hand being adapted. to

be swung away from its predetermined position by the dial against force of the spring when said dial is moved angularly and returned by'said spring to said predetermined position when the dial is returned to its upright position.

8. The combination with tuning apparatus and a frame therefor, the tuning apparatus having an operating shaft; of a retractable dial, and a retractable pointer in cooperative relationship to the dial for indicating the angular position of 'operating shaf-t the shaft, separate bearingmeans in connection with said dial and said pointer by which said dial and pointer are adapted to be rotated on said shaft between extended and retracted positions without changing the angular position of said shaft, means by which, the same setting of the pointer with respect to the dial is adapted to be re-established after the dial and. pointer are moved away from and back to their extended position comprising a spring anchored to said pointer and said shaft tobias said pointer to a predetermined position with respect to the angular position of the shaft, means in said dial for engagement with said pointer to move it away from its predetermined position by said dial when said dial is retracted. I

9. In tuning apparatus which includes a variable condenser from which an operating shaftis in extension and the angular position of which is indicated by a dial and pointer; the combination of, means by which the dial and i' ointer are adapted to be rocked from an upright to a lowered position and thence back to their upright position wherein the pointer is adapted to occupy the position it occupied with respect to the dial prior to being rocked with said dial comprising,'first bearing means in connection with said dial by which it is journalled on the shaft, second bearing means in connection with said pointer by which it is also journalled on said shaft, first sto p means on said shaft, second stop means on said pointer, and resilient means anchored to said pointer and said shaft to bias the respective stop means into engagement with each other and thereby provide a predetermined position for said pointer with respect to said shaft when said dial is in its upward position, means on said dial for engagement with said pointer to move it away from its predetermined position by said dial against force of said resilient means when said dial is rocked to its downward position, said pointer being adapted to be returned to its predetermined position by said spring when said dial is rocked to its upward position.

10. In tuning apparatus which includes an the angular position of which is adapted to be indicated by a dial and pointer both of which the shaft between upright and inverted positions, the combination of, means drivingly coupled to the shaft by which said shaft is adapted to be rotated manually to a selected position, a spring-operated mechanism coupled to the dial to bias said dial to an upright position, resilient means anchored to said pointer and the shaft to bias said pointer angularly to a predetermined position with respect to said shaft and thereby indicate theposition of said shaft on said. dial when the dial is in its upright position, means on said dial for engagement with said pointer to move it away from its predetermined position by the dial upon movement to an inverted position, but adapted to be returned to its predetermined position as said dial is released for return to its upright position.

11. The combination with tuning apparatus housed within a cabinet having a slot in one of the walls thereof, of retractable indicating apparatus comprising a dial, and a pointer both of which are rotatable about the axis of the shaft through the slot between an exposed position outside the cabinet and an obscuredpositon within the cabinet, means drivingly coupled to the shaft by, which said shaft is adapted to be ,rotated manually to any selected position, first are rotatable about the axis of l0 stop means on said shaft, second stop means on said pointer, resilient means anchored to said shaft and said pointer to bias the respective stop means into cooperative relationship to each other and to thereby provide an indicating position of said pointer with respect to the dial when said dial is in its exposed position, the respective stop means being adapted to be moved out of cooperative relationship with each other when said pointer is moved by the dial as said dial is moved away from its exposed position, said pointer being adapted to be returned to its indicating position by said resilient means when said dial is returned to its exposed position.

12. In tuning apparatus which includes an operating shaft the angular position of which is adapted to be indicated by a dial and pointer both of which are rotatable on the shaft between upright and inverted positions, the combination of, means drivingly coupled to the shaft by which said shaft is adapted to be rotated manually to a selected position, a spring operated mechanism in communication with the dial by which said dial is biased to an upright position, a trigger mechanism to releasably retain the dial in its inverted position when swung thereto manually, resilient means anchoredto said pointer and the shaft to bias said pointer angularly to a predetermined position with respect to said shaft and thereby indicate the position of said shaft on said dial when the dial is gin its upright position, said pointer being adapted to be moved away from its predetermined position by the dial but adapted to be returned to its predetermined position as said dial is released by operation of said trigger mechanism for return to its upright position.

13. The combination with tuning apparatus housed within a cabinet having a slot in one of the walls thereof and an operating shaft in extension from the tuning apparatus, of retractable indicating apparatus comprising a dial rotatable about the axis of the shaft betweenan obscured position within the cabinet and an indicating position outside of the cabinet, mechanism including a cam having a notch thereon fixed to the dial, a spring pressed follower adapted to cooperate with said cam to bias said dial toward its indicating position, the dial being adapted to be releasably retained in its indicating position by cooperation between said folspect to the shaft to thereby indicate the position of said shaft on the dial when said dial is in indicating position, said pointer being adapted to be moved away from its indicating position by the dial when said dial is moved manually away from its indicating position, said dial and pointer being adapted to again indicate the positionof the shaft when they are released for return to their last occupied positions.

14. The combination with tuning apparatus supported by a frame and housed within a cabinet having a slot in one of the walls thereof and an operating shaft in extension from the tuning apparatus, of retractable indicating apparatus comprising a dial rotatable about the axisof the shaft between an obscured position within iacsaoae the cabinetand an indicating positionoutside of the cabinet, mechanism including a cam having a notch thereon fixed to the dial, a spring pressed follower adapted to cooperate with said cam to bias said dial toward its indicating posi tion, the dial being adapted to be releasably retained in its indicating position by cooperation between said follower and said notch, said dial being adapted to close said slot when rotated to its obscured position, a trigger mechanism carried by said chassis to retain said dial in its obsoured position, said trigger mechanism being in extension through one of the walls of the cabinet for manual operation whereby the dial is adapted to be released for movement to its indicating position, and a pointer carried by said shaft by which the position thereof is adapted to be'indicated on the dial when it is in its indicating position.

15. The combination with tuning apparatus supported by a frame and housed-withina cabinet havinga slot in one of the walls thereof and an operating shaft in-extension from the tuning apparatus, of retractable indicating apparatus comprising a dial rotatable on the shaft between an obscured position within the cabinet and an indicating position outside of the cabinet, a cam having a notch thereon fixed to the dial, a follower lever pivoted to the frame, a follower carried by said follower lever, resilient means coupled to said lever to bias said follower into cooperation with the cam and thereby bias the dial toward its indicating position, the dial being adapted to be releasably retained in its indicating position by cooperation between said follower and said notch, said dial being adapted to'close said slot when rotated to its obscured position, a bracket adjustably mounted on said frame, a trigger mechanism carried by said bracket to retain said dial in its obscured position, said bracket being adjustable to assure proper closing of said slot by said-dial in its obscured position, said trigger mechanism being iii-extension through one of the walls of the-cabinet for manual operation whereby the dial is adapted to be released for movement to its indicating position, and a pointer carried-by said shaft by which the position thereof is adapted to beindicated on the dial when it is in its indicating position.

16. The combination with tuning apparatus for a radio receiving set adapted to be operated 'by a power circuit and including a frame within a cabinet having a slot in the top thereof, of a dial in pivotal relationship to thejframe for movement through the slot between an upright position in response to pressure from said follower means, and a switch in the power circuit to control operation of the radio receiving set said switch being adapted to be opened and closed in response to movement of said dial when it is moved between its reversed and upright positions.

17. The combination with tuning apparatus for a radio receiving set adapted to be-operated'by a power circuit and including a frame within a i2 cabinet having a slot in the top thereof, of a dial in pivotal relationship .to the frame for movement through the slot between an upright position and a reversed position within the cabinet, said dial in its reversed position being adapted to close said slot, latch mechanism including a movable member coupled to the frame, a handle in extension outside of the cabinet, said handle being in communication with said latch mechanism, a first spring coupled to said movable member to concurrently maintain the handle in one position, said movable member engaging said dial to maintain the dial releasably in its reversed position, a cam about the axis of the dial and in fixed relationship thereto, a follower lever pivoted to the frame, a follower on the follower lever, a second spring anchored to'the follower lever and to said frame to bias said follower into engagement with said cam, said cam being formed to urge said dial to its upright position in response to pressure from said follower, said dial being thereby adapted to be swung to its upright position, and a switch in the power circuit to control operation of the radio receiving set, said switch being engaged by said follower lever and thereby closed when the dial is moved to its upright position and opened when said dial is moved to its inverted position.

18. The combination with-tuning apparatus for a radio receiving set adapted to be operated by a power circuit andincluding a frame within a cabinet having a slot in the top thereof, of a dial in pivotal relationship to the frame for movement through the slot between an upright position and a reversed position within the cabinet, said dial in its reversed position-being adapted to close said slot, latch mechanism including an adjustable arm in association with the frame, resilient means between the arm and frame to bias said arm in one direction, threaded means coupled to frame to urge the arm in the opposite direction against the force of the resilient means, a latch lever pivoted to the adjustable arm, a manually movable member movably anchored to the frame, a springanchored to the latch lever to bias said latch lever into engagement with the manually movable lever, said manuallymovable lever being thereby adapted to be resiliently maintained 'in a predetermined position, a projecting member in connection with 'the dial adapted to be engaged by 'said'latch lever for releasable retention of said dial in its inverted position, a cam about the axis of the dial and in fixed relationship thereto, spring-pressed follower means in pivotal relationship to 1the frame, said cam being formed to urge said dial to its-upright position in response to pressure fromsaid followermeans, said dialbeing adaptedto rotate to said upright position inresponse to the urging of said cam upon release of said projecting member by said latch lever, and a switch in the power circuit to control operationof the radio receiving set, said switch being adapted to be opened and closed in response to motion of theidial between its upright and inverted positions.

19. In a radio receiving set, the combination of a tuning shaftfor tuning the ;receiver,-.a.movable dial supported near the inner :end of said shaft and .a pointer ,zfixed to said shaft adapted to travel over .said dial to indicate thestation to which the set is :tuned, a pulley .rotatably journalled on said shaft having a control knob thereon, a volume control for said receiving set connected in driven relationship with said pulley.

, l3 and a tuning knob fixed to said shaft at its outer end coaxial with the knob.

20. In radio apparatus having tuning apparatus and a volume control, the combination of v a tuning shaft for said tuning apparatus, indicating apparatus including a dial, and bearing means on the dial by which said dial is rotatably supported by the shaft for movement between an upright position and a reversed position within the cabinet, a first pulley journalled on the shaft, :3. second pulley in operative communication with the volume control device, manual means is fixed paratus, and resilient means in engagement with the cable to tension said cable and provide operative frictional engagement between said cable and said first pulley.

21. A housing for a radio comprising a case formed with a slot in a wall thereof, a movable dial movably supported in said case, said dial being movable between an exposed and a retracted position and formed to substantially close said slot when in the retracted position.

22. A housing for a radio comprising a case formed with a slot in a wall thereof, a movable dial mcvably supported in said case, said dial being movable between an exposed and a retracted position and formed to substantially close said slot when in the retracted position, and resilient means engaging said dial to urge it to the exposed position.

23. In a radio receiving apparatus comprising a frame for support of a tuning shaft and volume control apparatus all of which are supported in a cabinet having a slot in the top thereof, the

combination of, indicating apparatus including a slot is closed by the dial, a driver pulley journalled on the solid shaft, a drivable pulley in driving communication with the volume control apparatus, a rotary handle in fixed relationship to the driver pulley by which said pulley is adapted to be turned, a cord looped about both of said pulleys, anchor means in connection with the drivable pulley by which said cord is adapted to be anchored thereto at a point at the periphery thereof, and resilient means to join the respective ends of the cord, the driver pulley being thereby frictionally embraced by the cord to normally provide driving relationship between said driver pulley and cord and slippage therebetween when the drivable pulley is turned to limits permitted, by the volume control apparatus.

24. A'housing for a radio comprising a case formed with a slot in a wall thereof, a movable dial movably supported in said case and movable in said slot, said dial being movable between an exposed and a retracted position and formed to substantially close said slot when in the retracted position, and resilient means engaging said dial to urge it to the exposed position, and latch means engageable with said dial for holding said dial in a retracted position.

25. A housing for a radio comprising a case formed with a slot in a wall thereof, a movable dial movably supported in said case and movable in said slot, said dial beingmovable between an exposed and a'retracted position and formed to substantially close said slot when in the retracted position, and resilient means engaging said dial to urge it to the exposed position, and latch means engageable with said dial for holding said dial in a retracted position, and manually .operable means connected to said latch and extending out of said cabinet for releasing said latch.

'REUBEN C. CARLSON.

References Cited in the file of this patent UNITED STATES PATENTS Switzerland Oct. 16, 1940.

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