US2343219A - Control apparatus - Google Patents

Description

Feb. 29, 1944. R, c. MARHOLZ CONTROL APPARATUS Filed March 26, 1941 4 Sheets-Sheet 1 F/ZZQ/a 6 //a/ Feb. 29, 1944.

R. c. MARHOLZ CONTROL APPARATUS Filed March 26, 1941 4 Sheets-Sheet 2 C mmyfl 6/4 w w w m J :M.

a a H f a Feb. 29, 1944. R. c. MARHOLZ CONTROL APPARATUS Filed March 26, 1941 4 Sheets-Sheet 3 Feb. 29, 1944. c MARHQLZ 2,343,219

CONTROL APPARATUS Filed March 26, 1941 4 Sheets-Sheet 4 ZZ i: J11.

Patented Feb. 29, 1944 CONTROL APPARATUS Richard C. Marholz, Chicago, Ill., assignor to Belmont Radio Corporation, Chicago, Ill., a. corporation of Illinois Application March 26, 1941, Serial No. 385,316

22 Claims.

This invention relates to control apparatus and in particular to a tuning device of step-bystep type for radio receiving apparatus;

-may be manually tuned independently of the step-by-step tuning means.

A further object of this invention is to provide a tuning device adaptedfor' both step-by-step and manual tuning and having means for indieating the frequency tuning positionsat all times of tuning operation.

Yet another object of this invention is to provide a tuning device of step-by-step-type for .radio receivers in which the step-by-step tuning means is operated by a single control or treadle unit supported on and formed as a part of the radio cabinet.

A particular feature of this invention is found in the provision of a tuning device adapted-for step-by-step and manual tuning and having rotary control means for step-by-step tuning operatively connected with frequency changing means, by means including a pivoted stop portion which is slidably movable transversely of the rotary control means and out of an engaging position therewith concurrently with a setting of the tuning device for manual tuning, whereby to render the rotary control means inoperative during manual tuning.

Yet another feature of this invention is found in the provision of a tuning device adapted for both step-by-step tuning and for manual tuning, in which the manual tuning means is in operative engagement with the frequency changing means at all times. Means operatively associated with the manual tuning means for visibly indicating j frequency tuning positions are thus operable directly in response to the movement of the fre- ..quency changing means so as to indicate frequency tuning positionsat all times of operation of the tuning. device.

'1 Further objects, features, and advantages of this invention will become apparent from the following description when taken in connection with the accompanying drawings, in which Figure 1 is a front View of a complete cabinet for a radio receiver showing th -arrangement of the improved tuning device therein;

Fig. 2 is a side view of a complete assembly of the improved tuning device;

Fig. 3 is a sectional view as seen along the lines 3-3 in Fig. 2|

Fig. 4 is a view partly in section line 4-4 in Fig, 2;

Fig. 5 is a transverse sectional view of the tuning device showing certain parts thereof in their relative positions f or, manual tuning;

Fig. 6 is an end view looking toward the right as viewed in Fig. 1 and showing the control or treadle unit for the improved tuning device in changed positions;

Fig. 7 is a view illustrated similarly to Fig. 2 showing the parts thereof in a changed position;

Fig. 8 is an end view looking toward the left as viewed in Fig. '7;

Fig. 9 is a perspective view of the rotary control means adapted for step-by-step rotation, and the actuating unit therefor;

as seen along Fig. 10 is a sectional view taken along the line lil'l0 in Fig. 2;

. Figs. 11 and 12 are detailed views in perspective of certain parts included in the means for controlling the movement of the treadle unit which operatively connects the rotary control means and the frequency changing means;

Fig. 13 is a detail view in perspective of a part of the treadle unit which directly engages the rotary control means;

Fig. 14 shows the improved tuning device of Fig. 2 adapted for step-by-step operation by a solenoid;

Fig. 15 is a fragmentary view of the tuning device illustrating its adaptation for step-by-step operation with a single revolution motor;

Fig. 16 is a schematic diagram of a control circuit for the electricaloperating means shown in Figs, 14 and 15;

Fig. 17 is a front view of a radio cabinet showing the control unit for the improved tuning device supported on a front panel portion thereof;

Fig. 18 is a fragmentary sectional view as seen along the line !8l 8 of Fig. 17;

Fig. 19 illustrates schematically a control switch and a circuit therefor adapted for use with the tuning device to indicate in the panel of Fig.

1'? the stations being tuned in during step-by-step operation. 7

Fig. 20 is a view of the improved tuning device illustrated similarly to Fig. 4 and showing the assembly therewithof station. indicating means;

and

Fig. 21 is a fragmentary view with parts thereof broken away and taken along the line 21-21 in of the treadle unit and rotary control means but is pivotally movable concurrently with the treadle unit. Astep-byestep or-successive rotation of the rotary control mean provides for a step-by-step operation of the tuning device, this rotation being accomplished by a reciprocating unit having operating portions thereon selectively engageable with the rotary control means and reciprocally movable axially of the rotary control means, with each complete reciprocation of the reciprocating unit serving to move the rotary control means a predetermined angular distance to one of its control positions. The rotary control means includes a plurality of axially adjustable members whichare arcuately spaced so that one thereof engages the stop portion on the treadle unit when the rotary control means is in a control position, to limit the pivotal movement of the treadle unit in a direction toward the adjustable members. This limitation in the pivotal movement of the treadle unit defines the adjustment of the frequency changing means to a tuning position corresponding to a control position of the rotary control means.

For a manual tuning of the tuning device there is provided a control knob mounted on' axis means which areoperatively connected with the pivoted stop portion of the treadle unit such that rotation of the control knob pivotally moves the stop portion to effect an adjustment of the frequency changing means. The control knob and its axis means are linearly movable and adapted to linearly slide the stop portion transversely of the treadle unit and out of an engaging position with the adjustable members of the rotary con-' trol means. Any later pivotal'movement of the stop portion on rotation of the manual control knob is thus entirely free of any effect on the rotary control means. Locking means are provided to retain the stop' portion in its position for" manual tuning, with the reciprocating unit being adapted to release the locking means to permit the stop portion to return to its position for step-by-step tuning. This function of the reciprocating unit occurs on its initial operation after 21 and indicator 28, an on-and-oif and volume control knob 29, and a knob 30 for manual tuning. A treadle or control unit 3| is supported on the cabinet at the top thereof and is adapted to "operate the tuning device for step-by-step tuning. The controlunit 3| is arranged for engage ment with a reciprocating actuating unit 32 for the improved tuning apparatus which is designated generally as 33. p

The tuning apparatus (Figs. 2 and 3) includes side frame members 34 and 34cwhichare connected to a U-shapedsupporting plate 36 having end or leg portions 36a and 36b and a bottom portion 350. As shown in Fig. 1, the supporting plate 36 is mounted on a base plat suitably arranged in the cabinet 25. Also supported on the base plate 31 are linearly adjustable frequency changing means 38 of inductance type having linearly adjustable core elements 39 pivotally connected at one end to a pivoted treadle unit 4! to be later described. From a consideration of Fig. 1, therefore, it is seen that the tuning device nil 36a and 36b of the U-shaped frame member 36.

Mounted on the shaft 42, and substantially intermediate the ends thereof, is a sleeve or spacing collar 44 having plate or disc members 45 and 46 at opposite ends thereof formed with teeth or radially extending projections 450-45), and 4Ba,46f, respectively. The radial portions on each plate member 45 and 46 are indicated as being six in number, but it is to be understood that any number which forms an aliquot part of a circle may be used. The spacing collar 44 and toothed members 45 and 46 are assembled together as an integral unit with the radial portions 45a45f on the plate member 45being in axial alignment with the radial portions Mia-46f on the other plate member 46. Each pair of axially aligned radial projections is associated with a'corresponding axially adjustable selector member or screw 48a-48f, each 'of which is threadably supported in axially aligned apertures formed'in the plate members 45 and 46. Although each adjustable screw Mia-48f is shown as being in radial alignment with its corresponding pair of radial projections, it is to be understood that the adjustable members are not restricted to this arrangement, but may be angularly spaced relative to the projections, so lon as they correspond in number to the projections and are equally angularly spaced about the con trol shaft 42.

The step-by-step tuning of the tuning device, as will be later'fully described, is accomplished by a successive rotation of the rotary control means an angular amount which is equal to the angular distance between adjacent ones of the adjustable screw members 48a-48f. In other words, the rotary control means is successively rotated so that each adjustable screw is successively moved, during one complete revolution of the shaft 42, to a position which is common to all of the adjustable screws. This step-by-step rotation of the rotary control means is accomplished by the reciprocating unit 32 which is formed with a flat body portion 5!, having laterally extending side members 52 and 52a and a longitudinally extending portion 53 of reduced section. As shown in Figs. 2

. and 3, each side portion 52 and 52a is provided with a corresponding axis portion 54 and 54a which areslidably supported, in an associated slot 56 formed in the side frame members 34 and 34a previously noted. The leg member 3611 (Fig. 9)

is formed with a slot 51 adapted to slidably receive the reduced end portion 53 of the reciprocating unit 32. It is seen, therefore, that the reciprocating unit 32 is reciprocally movable in a direction axially of the control shaft 42, its movement in one direction being accomplished'by pushing inwardly on the end portion 53, and its movement in an opposite direction being efiected by a spring member 58 connected at one end to the side portion 52a and at its opposite end to the leg portion 36a.

As is clearly illustrated in Fig. 9, the body portion 5| of the reciprocating. unit 32 is formed with a substantially rectangularly shaped opening 6 l. The portion 5| is arranged relative to the rotary control means so that the axially aligned radial projections on the plate members 45 and :nearthe cam surface 63a.

46' on successive rotation of the rotary control "means are successively moved to extend through the opening 6i (Figs!) and 10).. Projecting inwardly into the opening El and from opposite ends thereof are operating or cam portions 62 and 63 relatively arranged for alternate engagement with adjacent pairs of the radial projections. As shown in Fig. 9, the reciprocating unit '32 is in its rest position. On its movement in- Wardly or to the left as indicated in Fig. 9, the cam surface 62a of the operating portion 62 lidably engages one side of the projection 46a, with the continued inward movement of the recipro eating unit acting to rotate the rotary control 'me'ans'in a counterclockwise direction, as also 55' viewed in Fig. 9. This inward movement of the reciprocating unit concurrently moves the operating portion 63 away from the tooth 4511 on the plate member 45 to permit rotation of the tooth 4517 into a position for slidable engagement with the cam surface 53a. Movement inwardly of the "reciprocating unit 32 is limited by the engagement ofthe projection 45b with a stop portion 66 projecting within the opening ii! and positioned It is contemplated that the tooth 45b engage the stop member 66 while it'is in slidable engagement with the cam surface. 53-01. This arrangement provides for a :positive stopping of the rotary control means at a control position and its locking in such control position by virtue of the somewhat wedged position of the tooth 45b between-the cam surface 630, and the stop portion to. This action of the reciprocating unit 32 on reciprocation thereof is 'cfcourse the same for all. of the teeth on the members 45 and it. theadditional rotation of the rotary control means by the operating portion 63 moving the projection 4th on plate :38 into an engaging position with the operating portion 62 so as to be slidably engaged therewith on later actuation of the reciprocating unit 32. i

It is seen, therefore, that the operating portions .62 and 63 cooperate in rotating the rotary control means to successive control positions, the

. combined rotative effect thereof being such that the rotary control means is moved a total angular distance which is equal to the angular distance between adjacent ones of the. radial projections or adjustable screw members. The relative arrangement of the operating portions 52 and B3 and their corresponding cam surfaceson the actuating unit 32 is such that rotation of the rotary control means is initiated only after the actuating unit has been moved an amount sufiicient to move the locking portion 65 out of an engaging position with a locked projection. It is to be noted also that the movement of the reciprocating unit in both directions is limited by engagement of the shoulder portion 6d and the stop portion 65 directly with one of the radial projections. Since the reciprocating unit is reciprocally movable axtive degree of rotation produced by each of the operating portions 62'and 63 is immaterial so long as the total rotation of the rotary control means is equal to the angular distance between adjacent ones of the adjustable screw members. It is apparent of course that but a single plate may be substituted for the two plate members 45 and 45 by merely relatively changing the positions of the operating portions 62 and 63 to accommodate a desired linear travel of the actuating unit.

Operative connection of the rotary control means with the frequency changing means 38 is accomplished through the pivoted treadle unit 41 previously mentioned, which includes a pair of spaced side frame members or arms 61 and 88 (Figs. 2 and 3). These arms are of similar construction and are formed with their opposite end portions 69 and H longitudinally ofiset as is clearly shown in Fig. 3. Each end portion H is provided with a mounting portion 72 which is pivotally supported for slidable movement in a slot 73 formed in each of the side members 34 and 34a. The treadle arms El and 6B are connected together at their end portions 69 by a brace or tie bar 14 (Figs. 3. 7 and 8) having openings 43 formed therein for receiving the end portions of the adjustable core elements 39. Each portion 59 is formed with a recess 16 adapted to receive therein an axis portion Ti provided oneach end of a pivoted bar T8. The axis portions H are retained in their corresponding recesses it by a wire spring 79 supported on each arm 6'! and 6B and arranged to exert a holding pressure on the axis portions ll. Because of the tie bar or brace M the ends of the pivoted bar 18 are clear of the inside faces of the arms 6'! and 38 so that the bar 18 is freely and easily movable at all times. By virtue of the pivoted bar i8 and its pivotal connection with the elements 3%, there is provided a substantially free movement of the cores 39 to their tuning positions within the inductance units 38.

Arranged between the arms 51 and 58 is a stop portion 8! (Figs. 2 and 13) of substantially U- shape, having leg members 82 and a finger or extending portion 83 projecting outwardly in a direction opposite from the leg members 82. Each leg member is formed with apertures 84 and 86 near the opposite sides thereof, with the corresponding apertures in the leg members being in axial alignment. The stop member 86 at the apertures 84 is rigidly mounted on a pin or shaft member 8'! (Figs. 2 and 5) which is rotatably supported for axial slidable movement in bearing elements 88 mounted in the side frame members 3d and 34a. Another pin or axis means 9| is slidably inserted through the apertures 36, the opposite ends of the pin 91 being rotatably supported in the portions H of the treadle arms 61 and 68. The pin 9| is maintained in a position transversely of the treadle arms El and 68 by means of locking collars 92 having one end mounted on the bearing elements 88 and their opposite ends slotted to fit within grooves formed in the shaft 9|. It is seen, therefore, that the stop member 8! and shaft 81 are assembled as an integral structure and that this structure is slidable relative to the shaft 95 for a purpose to be later explained.

When the tuning device is operated for stepby-step tuning the stop member BI is arranged transversely of the rotary control means with the finger portion 83 in axial alignment with one of the adjustable members 48a, 58b 8} and 93 inc, counter-clockwise direction, as viewed in" pivotally movable into an engaging position with successive ones of the adjustable members. In other words, since each adjustable screw member is successively moved to a position previously occupied by the next adjacent screw member the positioning axially of the stop portion relative to any one of the screw. members places it in a position for successive engagement with all of the screw members on rotation of the rotary control means through a complete revolution.

Pivotal movement of the finger portion 93 toward and away from the adjustable members 48a,48f, is accomplished by means including the actuating unit 32. On movement of the reciprocating unit 32 inwardly or downwardly as viewed in Fig. 3, in its actuation of the rotary control means, the inner or bottom end 99 thereof slidably engages the finger portion 93 substantially concurrently with the engagement of the operating portion 62 with one of the radial projections on the plate member 46, as was above fully described. This slidable engagement between the actuating unit and the finger portion 83 pivotally moves the finger 83 away from the adjusting screws to in turn pivotally move the treadle unit 4| to linearly move the adjustable core elements 39 inwardly of the inductance units 38 or to the right, as is also viewed in Fig. 3. This pivotal movement of the stop member 8| by the actuating unit 32 continues during the entire inward movement of the actuating unit. Thestop member 8| is thus moved away :from the adjustable screws Mir-99), on the initial-rotation of the rotary control means,v by the bottom portion 99 of the actuating unit 32, to avoid z'.

any catching or looking engagement'therewith. Since the return'movement of the actuating unit through operating portion 83 also effects a rotation of the rotary control means, it is preferred that the finger extension 93 be maintained away from the adjustable screws until all rotative movement of the rotary control means is substantially stopped. Thus on return of the reciprocating unit 32 to its rest position, the stop member 8| is retained in the position to which.

it was moved by the reciprocating unit and moved into engagement with the rotary control means by means now to be described.-

These means include a spring actuated rodlike member 93 (Figs. 2, 3 and 12) which, as is shown in Fig. 12, is of irregular shape but is comprised essentially of two portions 94 and 96 which are arranged substantially at right angles to each other and positioned in substantially parallel planes and connected by a portion 95. The portion 94 has a bent end 91 slidably supported in an aperture formed in the leg member 36b of the base plate 36, while the portion 96 has a bent end 98 pivotally upported in a lug or bumped out portion 99 provided on the connecting portion 380 of the base 36. A compression spring I8I is arranged on the end part 91 between the wall portion 36b and the portion 94 of the member Thus on pivotalmovement of the member Fig. 3, the spring member I0| is compressed whereby the arm. 93 isbiased in a clockwise direction. 1

Placing of the spring |9l in compression is accomplished by the reciprocating unit 32 concurrently with its pushing of the finger portion 83 on the element 8| away from the adjustable screws 48a |8f, the end 90 of the reciprocating unit 32 (Fig. '3) slidably engaging theportion 96 of the member 93 and pivotallyjmoving, such meme ber downwardly. Although the portion 94 of the member 93 extends transversely of the finger portion 83, as shown in,Fig.'2, it is contemplated that the stop portion 8| and member 93 be separately movable by the reciprocating unit 32. Shortly before the reciprocating unit 32 reaches its innermost position, the portion 96 of the mem ber 93 is releasably engaged by a shoulder portion I02 formed on a trip lever I03 (Figs. 2, 3 and 11). The lever I03 is of substantially U-shape with one of the leg portions I84 having a shoulder I02 formed thereon and the other leg portion I06 being adapted for sliding engagement with an operating or cam portion I0'I formed at the outer end of the body portion 5| of the reciprocating unit 32 (Fig. 2). The member I03 is pivotally supported by pin means or the like I05 on the base portion 380 of member 36 and is normally tensioned for movement in a counter-clockwise direction, as viewed in Fig. 2, by means of a spring I09 connected at one end in an aperture I|I formed in the member I03 and at its other end to a portion of the side frame member 34. The member I03, therefore, is normally yieldably urged into engagement with the portion96 of the member 93 and is in sliding engagement therewith until the member 93 is pivotally moved into an engaging position with the shoulder I02. With the reciprocating unit 32 at its innermost position the adjustable core elements 39 are in their innermost positions relative to the inductance units 38, and the spring actuated member 93 is looked under tension by the trip lever I03, the relative arrangement of these parts of the tuning apparatus being shown in Figs. 7 and 8. From a consideration of Fig. '7, it is also seen that only the operating portion 62 is in engagement with one of the radial projections on the plate 46 and that the operating portion 63 has not yet been moved to an engaging position'with one of the radial projections on the plate 45. On a release of the reciprocating unit 32 the operating portion 63 functions to complete the rotary movement of the rotary control means as above described, while the spring actuated member 93 and the stop member 8| maintain their relative positions as shown in Fig. '7. However, on movement of the reciprocating unit 32 to a position such that the rotation of the rotary control means is substantially completed, the cam portion I01 engages the leg member I06 on the trip lever I03 to in turn move the shoulder I02 out of its engaging position with the portion 96 of the member 93. This disengagement of the trip lever I03 and member 93 releases the spring IM to move the member 93 toward its position shown in Fig.3. Since the portion 94 of the spring actuated member 93 is arranged transversely of and directly back of the finger 83 of the stop member 8|, this return movement of the member 93 pivotally moves the finger portion 83 toward the adjustable screw members and into engagement with the screw member in axial alignment therewith. It is contemplated that the spring |0l be retained under some compression when the arm 93 has been released by the lever I03, so that the finger portion 83 is yieldably retained against the screw member with which it is in engagement.

, By virtue of the pivotal connection of the stop .member 8| with the treadle arms 81 and 68 through the shafts 31 and 9|, the spring return of the member 93 serves also to pivotally move the treadle unit 4| to in turn move the adjustable core elements 39 to a tuning frequency corresponding to the control position of the rotary control means. In this connection it is to be noted that the adjustment of the core elements 39 to a tuning position is always in the same direction, namely to the left as viewed in Figs. 3 and 8, so that any lost motion in the pivotal connections of the treadle unit 4| are similarlycompensated for, for each tuning of the radio receiver. This arrangement provides for a more accurate or fine tuning of the radio receiver for all control positions of the rotary control means. Also, as is illustrated in Fig. 3, the driving of the treadle arms 6'! and 58 by the stop member 8| occurs by virtue of the pivotal movement of the leg members 32 about the shaft 31. This pivotal movement of the stop member is transmitted to the treadle arms 61 and 63 through the arcuate movement of the shaft 9|. This pivotal movement of the leg members 82 is stepped up or increased at the end portions 59 of the arms 67 and 68 because of the off-set construction of the arms 51 and 68, the slidable movement of the axis portions 12 in the slots 13 tending to flatten out the arcuate movement of the end portions 69. This cooperative action of the arms 6'! and 68 and stop member 8| in conjunction with the slidable support of the mounting portions 12 effects a relatively large movement of the adjustable core elements 39 in a substantially linear direction.

As was previously mentioned, the stop member 8| is in direct engagement with one of the screw members ma-48 when the rotuy control means is in one of its control positions. In the adjustment of the screw members, therefore, any axial movement thereof is directly transmitted to the adjustable core elements 39 through the above described mechanism. Each screw member 48a--48f at its end 108 opposite the end in engagement with the finger portion 83 is formed with a screw slot. The leg member 36a (Fig. 4) is formed with an opening I H) which is in axial alignment with a screw member when it is in engagement with the finger portion 8|, and of a size adapted to receive a screw driver or the like. Each screw may thus be successively adjusted to a desired tuning frequency of the radio receiver. By virtue of the step-by-step opera tion of the rotary control means it is apparent that eacH station corresponding to an adjustable screw dart-48 will be tuned in but once for each revolution of the rotary control means. The adjusted position of each screw is retained by a flat spring member 4! mounted in the plate members 45 and 46 and flexed for pressing engagement with its associated screw (Fig. 2).

When the tuning device is used in portable radio receivers it is contemplated that the reciprocating unit 32 be arranged for movement in a vertical direction as was previously noted in connection with Fig. l. Portable radio receivers are relatively light in weight, and in the operation of push button units which are arranged laterally of the radio cabinet. an operation of the push button generally results in a pushing or sliding of the entire receiver on its supporting stand. By actuating the unit 32 in a vertical direction the pushing force applied thereon is downwardly, so as to be ineffective in sliding the entire radio receiver. The treadle or control unit 3| (Fig. 6) is of a length substantially equal to the width of the top portion of the radio cabinet 25 and is pivotally connected at one end to axis means I supported on adjacent parts of the cabinet top portion. The control unit 3| is .of a shape or contour which. conforms with the contour of the radio cabinet so'as to blend with the cabinet and appear as a part thereof. By virtue of the relatively long length of the control unit 3| and its pivotal connection at one end, it is not necessary that the force applied thereon be applied at any particular part thereof since it may be applied thereon anywhere over its length. Tuning of the radio receiver is thus simplified since the entire control unit 3| is readily accessible and its actuation may be accomplished by the use of either an open or closed hand. Since the control unit 3| is always pushed downwardly, all lateral sliding of the radio receiver during tuning is entirely eliminated. In its normal position the control unit 3| appears as shown in full lines in Fig. 6, with its depressed or actuated position being shown in dotted lines and indicated as 3| a. In the adjustment of the screw members 4811-48 the control unit 3| is moved to the dotted position 31b, so that the entire end portion of the tuning device, as shown in Fig. 4, is readily accessible. There is, therefore, no difficulty in inserting a screw driver through the cabinet 25 for positioning in the opening H6 in the plate 36a leading to the ends H38 of the screw members Alla- 38 As previously mentioned, the shaft 81 is axially slidable in the bearing portions 88 and the stop member 8| is slidably movable on the shaft SI for a purpose which will now be explained. Shaft 81 has an extending portion H2 having. a gear element ||3 mounted thereon (Figs. 2 and 5). This gear is in meshing engagement with a gear H4 mounted on a manual control shaft H6 having a reduced end portion II! rotatably supported but axially slidable in the side frame member 34. An annular shoulder portion H 8 is provided adjacent the gear H4 for engaging a side face of the gear II on axial movement of the shaft H6 toward the left as viewed in Fig. 5. The manual control knob 3E1, previously mentioned, is mounted on the shaft I I6 which extends through the front panel of the radio cabinet 25 as illustrated in Fig. l. The frequency indicating pointer 28 is also mounted on. the shaft H6 so that any rotation of the shaft H6 moves the indicator 28. to indicate directly on the dial face 21 the particular frequency to which the radio receiver is tuned.

To manually operate the tuning device, the control knob 36 is pushed toward the cabinet 25 to in turn move the shaft I I6 toward the left from its position shown in Fig. 2 for step-by-step tuning to its position shown in Fig. 5 for manual tuning. Because of the shoulder portion H8 engaging the gear I IS, the shaft 81 is axially moved concurrently with the axial movement of the shaft H5. This axial movement of the shaft 87 moves the stop member 8| transversely of the treadle unit 4| and specifically moves the finger portion 83 out of an engaging and axially aligned position with the adjustable screw members 4850-48) as is clearly shown in Fig. 5. This axial movement is of an amount sufiicient to eliminate any possibility of the extension 83 engaging the screw members on later. rotation of the shaft 8'! for manual tuning, the rotary control means being stationary during manual tuning of the radio. The transverse movement of the stop member 8| also effects its disengagement with the spring-actuated member 93 so that the portion 94- of the member 93 in response to the com pressive pressure of the spring I! may move to a position closer to the adjustable screws.

As is clearly shown in Fig.- 5, the portion H! of the shaft H5 is formed with a small groove I29 adjacent the gear II4. This groove I28 on axial sliding of the shaft ||6 for a manual operation of the tuning device is adapted to receive in looking engagement the locking portion I2I' of a pivoted locking arm H3 (Fig. 8). The arm H9 is normally under the tension of a spring I22 to urge the portion I2| into yielding engagement with the shaft portion Ill and to retain the portion I2I in its shaft locking position. With the shafts I I8 and 81 locked in their positions for manual tuning, control of the adjustable core elements 39 is accomplished directly by rotation of the control knob 30 by virtue of the gear train II 3-||4 and the pivotal movement of the stop member 8| by the shaft 81. It is to be noted that the rotary control means is entirely inoperative when the j device is manually tuned. Also the pressure of the spring IIII is completely removed from the stop member 8| so that the inertia 'of the tuning means serves to retain all manually adjusted tuning positions.

When it is desired to again tune the radio re ceiver by step-by-step tuning, the reciprocating unit 32 is operated in the manner as was above fully described for rotating the rotary control means. This operation of the reciprocating unit 32 slidably moves the axis or mounting portion 54 into engagement with the portion I23 of the locking arm 9 (Fig. 8) to pivotally move the arm I I9in a direction to lift the locking portion I2| out of the groove I28, thereby releasing the shafts 81 and H6 from their locked positions. The shafts H6 and 81 are thus permitted to return to their relative positions for step-by-step tuning, this return movement being accomplished by a spring I24 arranged in compression between one of the sides 82 of the stop member BI and a holding element 92. The return movement of the shafts 81 and H6 is defined by the engagement of the collar II8 with a supporting or journal bracket I26 for the shaft IIB (Figs. 2 andfi), which is mounted on the side frame member 34. Prior to the engagement of the axis portion 54 with the end I23 of the pivoted locking arm H9, the member 93 is engaged by the end 9|] of the reciprocating unit 32. Thus on release of the shafts 81 and H6, the finger extension 83 moves toward the right, as viewed in Fig. and

in front of the portion 94' of the member 93 by portion 95 between the member portion 94 and the end 98 of the reciprocating unit. Since all of the parts of the tuning device therefore are relatively arranged for step-by-step tuning by the normal actuation of the reciprocating unit 32 for step-by-step tuning, the radio receiver may be tuned by this method immediately after any manual tuning without the requirement of any intermediate settings of the tuning device. In other words, the tuning device after manual tuning is prepared for step-by-step tuning in the manner above described on initial movement of the reciprocating unit 32' to its inner position.

From a consideration of Figs. 5 and 8, it is readily apparent that the gears II 3 and II 4 are in engagement during both manual and step-bystep tuning of the tuning apparatus. Since the shaft 81 is rigidly assembled with the stop member 8| any rotation of this shaft or any pivotal movement of the stop member 8| in turn produces a rotation of the manual control shaft II6. With the indicator 28 mounted on the shaft IIB it is readily apparent that the tuning positions of the radio receiver are indicated by the pointer 28 for both manual and step-by-step tuning.

(ill

The frequency tuning positions corresponding to the control positions of the rotary control means are thus directly identified by the indicator 28. Also any adjustment of the screw members 48a48f is shown by the indicator 28 so that the screws may be adjusted directly to any station for which the tuning frequency is known.

Means for indicating directly the transmitting stations corresponding to the control positions of the rotary control means is shown in Figs. and 21. The control shaft 42 of the rotary control means at the end supported in the frame portion 33a is provided with a beveled gear I2'I. This gear is in driving engagement with a bevel gear I28 mounted at one end of a shaft I29, the opposite end of the shaft I29 having a pulley I38 in belt connection with a pulley |30a rotatably mounted on the manual control shaft H6. The frequency indicator 28 is mounted so that its end portion is visible through a ringed space I3I, formed in the front panel of the radio receiver cabinet. Also rotatably mounted on the shaft IIS and in a' position ahead of the indicator 28 is a disc I32 having a cut-away portion I33 near its periphery. The portion I33 is adapted to be rotated back of station windows I34 provided in the front panel of the cabinet and corresponding in number to the number of screw members 48 in the rotary control means. The ratios of the gears I21 and I28 and of the I pulleys I and |3Ila are such as to provide for a l to 1 ratio between the shaft 42 and the disc I32, which is attached to the pulley I3|Ia for concurrent rotation therewith. As noted, station marker or disc I32 and pulley I380; are rotatable relative to the shaft H6 so that they may be rotated in a direction opposite to the frequency indicator 28. For each control position of the rotary control means, therefore, the cut-away or window portion I33 is located directly behind a corresponding one of the station windows I34. It is contemplated that a light, indicated at I36, be mounted in a position behind the disc I32 so that illumination therefrom passes through the space I33 to in turn illuminate the station window corresponding to the control position of. the rotary control means. Because of this arrange.- ment the disc member I32 is successively rotated in the same direction to successive ones of the station windows I34, while the indicator 28 is moved in either direction to indicate the tuning frequency of the tuned station.

The adaptation of the improved tuning device for electrical operation is illustrated in Figs. 14 and ,15. Since the device shown in Figs. 14 and 15 is similar in many respects to the tuning device of Fig. 2, similar numerals of reference will be used to designate similar parts. As shown in Fig. 14, the reciprocating unit 32' is formed at its actuating or outer end with a bent portion I3! which is in direct connection with a plunger|38 of a solenoid unit I39. The solenoid I33 is mounted directly on the leg portion 36a. of the base plate 38 and is arranged so that the plunger is movable in a direction parallel with-the movement of the reciprocating unit 32. In the operation of the tuning device by the solenoid unit I39 the control unit 3| is provided with a portion |4I for closing an electrical switch I42 'arranged in the circuitof the solenoid unit. As shown in Fig. 16, this circuit may include leads I43 and I44 connected toa suitable source of supply, with a switch I42 being arrangedv in the lead I44. It is readily apparent that each time the control unit 3| is actuated the-solenoid unit I3;

is energized to operate the tuning device for step-by-step tuning in the manner above fully described.

In Fig. 15 the reciprocating unit 32 is provided with a pin I 68 mounted in the reduced portion 53 thereof and adapted for slidable engagement with a cam element I49 included as part of a single revolution motor (not shown). On rotation of the cam in the direction indicated by the arrow in Fig. 15, the actuating unit 32 is pushed .1

to its inner position, the cam M9 being constructed so as to ride or pass the pin M8 on completion of the inner movement of the reciprocating unit 32. By virtue of the well-recognized construction of a single revolution motor, the cam element I49 is rotated but once for each energization of the motor. The control circuit for the Fig. 15 arrangement would, therefore, be similar to that shown in Fig. 16 by substituting the motor for the solenoid unit I39.

In connection with Figs. 14 and 15 it isto be understood that the electrical operating means illustrated therein does not in any manner change the operation of the tuning device for manual tuning as was above fully described.

An assembly of the improved tuning apparatus 33 with the control or treadle unit located below the dial face on the front panel is illustrated in Figs. 17 and 18. As shown in Fig. 17, the front panel includes a manual control knob 30', an offand-on volume control knob 29', and a slanted front panel portion I54 including a dial face 21' and station windows I5I.. .As shown in Fig. 18, the tuning apparatus 33 is slanted downwardly from the panel portion I54, the control unit 3|" 1' the force applied on the unit 3I" is downwardly,

and that only a small part of such force is applied in a direction transversely of the radio cabinet 25'. Pushing downwardly on the control unit 3I," to operate the apparatus 33, therefore, does not effect any. sliding movement of the entire cabinet. As is readily apparent from a consideration of Fig. 17, the control unit 3I" forms an appreciable part of the front panel portion I54 and is formed to blend with the appearance of the front panel portion so as to appear as a component part thereof.

.The station windows I5I correspond in number to the number of the axially adjustable screw members 48w48f. In the step-by-step operation of the tuning apparatus it is contemplated to have a window I5I light up when its corresponding control position is reached by the rotary control means. This station designation of the control positions of the rotary control means may be accomplished by the electrical means diagrammatically illustrated in Fig. 19. The control shaft 42 at its end mounted in the leg member 36a has mounted thereon a contact arm 158 which is rotatable within a circular insulating shell I5! having contacts I58 circumferentially arranged therein, the contacts I58 corresponding in number to the station windows IEI and being equally spaced from each other. a

The arm I55is arranged on the shaft 42 so as to be in a contact closing position when theretary control means is in a control position. Each contact is suitably connected with a supply lead I59 through a conductor IBI having a light I5I' for each window I5I connected in series therein. The contact arm I56'is connected by a conductor N52 to the other supply lead I63. Thus on closing of a contact I58 by the arm I56 the corresponding light is illuminated to in turn illuminate its associated station window I5I. So long as the rotary control means is in a rotary control position, the rotatable arm I56 will be closed with a contact I58 so that the tuned station will be indicated at all times.

From a consideration of the above description and drawings it is seen that the invention provides a. tuning device of step-by-step type which is compact in arrangement, simple of design, and efficient in operation to successively and accurately tune in pro-selected stations. The device is readily adapted for either step-by-step or manual tuning without the requirement of any intermediate settings, and with the frequency indicator being operable at all times of tuning operation. By virtue of the relative arrangement of the rotary control means and frequency changing means, the entire tuning assembly may be mounted in a minimum of space and in a plurality of positions within the radio cabinet. Also, the improved tuning device is readily applicable for step-by-step tuning with electrical means. The single control unit for the reciprocating unit is entirely accessible for hand as well as for finger operation and by virtue of the compactness of the tuning device may be arranged in a plurality of positions on the radio cabinet for movement in a direction generally downwardly of the cabinet.

. Although the invention has been described with specific reference to inductance tuning, it is readily apparent that tuning means of the rotary or condenser type may also be used by operatively connecting such tuning means with the rotary shaft 87. It is to be understood also that although the invention has been described with specific reference to a particular embodiment thereof, it is not to be so limited, since changes and alterations therein may be made which are within the full intended scope of this invention as defined by the appended claims.

I claim:

1. In control apparatus having rotary control means including a plurality of angularly spaced portions thereon, the combination of means for rotating said control means to predetermined control positions including a, reciprocating unit, and means supporting said reciprocating unit for movement axially of said control means, said reciprocating unit having a pair of operating portions thereon, one of said operating portions slidab-ly engaging one of said spaced portions on movement of said reciprocating unit in one direction to initially rotate said control means, and the other of said operating portions engaging a next adjacent spaced portion on movement of said reciprocating unit in an opposite direction to additionally rotate said control means, said initial and additional rotations of said control means rotating said control means from one of said predetermined control positions to a second predetermined control position.

2. In control apparatus including rotary control means having a plurality of adjustable members and means adjustably supporting said adjustable members in an angularly spaced relation, said supporting means having a radially extending'portion thereon for each of said adjustable members, means for rotating said rotary control means to successive control positions including a reciprocating unit, means supportin said reciprocating unit for movement relative to said control means, said reciprocating unit having a pair of spaced operating portions thereon adapted to engage said radially extending portions, and adjustable controllable means operatively connected with said rotary control means and having a portion thereof in operative engagement with one of said adjustable members when said rotary control means is in one of said control positions, with said engagement defining an adjusted position of said controllable means, said operating portions during each reciprocation of said reciprocating unit alternately engagin successive ones of said radially extendingportions to rotate said control means from one of said control positions to a second control position.

3. In control apparatus having adjustable controllable means, rotary control means for said controllable means includin a plurality of adjustable members and means adjustably supporting said adjustable members in an angularly spaced relation; said supporting means having a radially extending portion for each of said adjustable members, means rotating said control means to predetermined control positions includjustable' members whensaid rotary control means is in a control position, with said engagement defining an adjusted positionof said controllable means, and means supporting said movable portion formovement toward and away from said adjustable members, said operating portions on each reciprocation'of said reciprocating unit alternately engaging successive ones of said radially extending portions to rotate said control means from one 'of said predetermined control positions to a second predetermined control position, and means yieldably urging said movable :portion into saidlenga-gement with said adjustable members, said latter means being rendered inoperative on movement of said movable portion to its farthermost position away from said adjustable members.

4..Tuning apparatus for a radio receiver including frequency changing means, rotary control means for said frequency changing means having a plurality of angularly spaced adjustable members, means operatively connecting said frequency changing means and rotary control means including a pivoted stop portion, means for rotating said rotary control means to succe"- sive predetermined control positions, said .piv-

oted stop portion being in operative engagement with one of said adjustable members for each controlposition of said rotary control means, with said engagement providin for an adjustment of said frequency changing means to a predetermined frequency tuning position of said radio receiver, means, pivotally supporting said stop portion for pivotal movement toward and away from said adjustablemembers including axially movable axis means, said stop portion being rigidly mounted on said axis means, a control knob for manually tuning said radio receiver second axis means for said control knob arranged, ,sub-. stantially parallel to said first axis means, said control knob being rigidly mounted on said second axis means, means supporting said second axis means for axial movement, means operatively connecting said first and second axis means for concurrent rotation, and for axial movement of said second axis means in response to a linear transitory movement of said control knob, and means releasably locking said two axis means in their moved positions, said axial movement move ing said stop portion out of operative engagement with said adjustable members to permit a free movement of said connecting means in response to a rotation of said manual control knob.

5. In tuning apparatus for a radio receiver having frequency changing means, rotary control means for said frequency changing means includ+ ing a plurality of adjustable arcuately spaced members, means including a reciprocating unit for rotating said rotary control means to successive control positions corresponding to predetermined tuning positions of said frequency changing means, means supporting said unit for reciprocal movement axially of said control means, said rotary control means having a radially extending portion thereon for each of said adjustable members, and said reciprocating unit having a pair of spaced operating portions which are alternately movable into engagement with successive ones of said radially extending portions when said unit is reciprocally moved, with said engagement rotatin said rotary control means from one of said control position to a second control position, means operatively connecting said rotary'control means with said. frequency changing means including a member movable .toward and away fromsaid adjustable members, said movable member being in operative engagement with one of said adjustable members when said rotaryv control means is in a control position, with said engagement defining a predetermined tuning position of said frequency changingmeans, said reciprocatin unit engaging said movable member in one direction of movement to move: it away from said adjustable members,

and means in operative engagement with said reciprocating unit for moving said movable member into operative engagement with an adjustable member when said reciprocating unit is substantially returned to its rest position so that said movable member is removed from said adjustable trol means for said frequency changing means including a plurality of adjustable arcuately spaced members, push-button means including .an actuating member for rotating said control means to successive control positions correspond,- ing to predetermined tuning positions of said frequency changing means, means supporting said actuating member for reciprocal movement axially of said control means, said rotary control means having a radially extending portion there on for each of said adjustable members, and said reciprocating unit having a, pair of spaced operating portions thereon which are successively movable into engagement with one of said radially extending portions. when said actuating member is reciprocally moved, with said engagement, rotatingsaid, rotary control means Iroin one of said control positions to a second control position, means operatively connecting said frequency changing means and rotary control means including a pivoted portion arranged to engage an adjustable member when said rotary control means is in a control position, axis means at substantially right angles to said rotary control means pivotally supporting said pivoted portion for pivotal movement toward and away from said adjusting members, means movably supporting said axis means for axial movement relative to said connecting means, and an actuatin knob for manually tuning said frequency changing means operatively connected with said axis means and adapted to rotate the same, said axis means being movable in response to a linear movement of said actuating knob to movesaid pivoted portion out Of a position for operative engagement with said adjustable members so that later rotation of said actuating knob operate said connecting means independently of said rotary control means.

7. In tuning apparatus for a radio receiver, including fram means and having frequency changing means with linearly movable adjustable elements, rotary control means for said frequency changing means rotatabl supported in said frame means and including a plurality of adjustable members and means supporting said adjustable members in an angularly spaced relation, said supporting means having a radially extending portion for each of said adjustable members, means rotating said rotary control means to successive control positions corresponding to predetermined tunin positions for said frequency 3 changing means including a reciprocating uni-t supported in said frame means for reciprocal movement axially of said control means, said reciprocating unit having a pair of operating portions thereon alternately movable into engagement with one of said radial portions when said unit is reciprocated, said alternate engagement rotating said rotary control means from one of said control positions to a second control position, means operatively connecting said rotary control means and frequency changing means including a pivoted treadle unit having one end thereof pivotally connected with said linearly adjustable elements, axis means pivotally supporting said treadle unit at its opposite end, said axis means bein supported in said frame means for slidable movement relative thereto, and said treadle unit being pivotally movable in a direction such that said linearly adjustable elements are moved in a plane at substantially right angles to the axis of said rotary control means, and means on said treadle unit successively engageable with said adjustable members to define the pivotal movement of said treadle unit in one direction, with the stopping of the treadle unit in said one direction adjusting said adjustable elements to a predetermined tuning frequency for said radio receiver. 7

8. In a radio receiver having a cabinet and including frequency tuning means with movable control means for said tunin means located within said cabinet, the combination of means for operating said control means to successive control positions corresponding to predetermined tuning frequencies for said radio receiver including an actuating unit, said cabinet including a pivoted portion operatively engageable with said actuating unit to move the same, and means pivotally supporting said pivoted cabinet portion at one end to adjacent cabinet portions, said pivoted cabinet portionserving as a push button and adapted tobe pushed inwardly to move said actuating unit and operatesaid control'means 9. A cabinet having a top portion for a radio receiver including tuning means and movable control means for said tuning means, means for moving said control means to successive predetermined control positions including a linearly movable actuating unit, a pivoted control unit in operative engagement with said actuating unit, and means pivotally supportingsaid control unit on the top portion of said cabinet, said control unit being adapted to be pushed downwardly to linearly move said actuating unit and having a shape which blends with the contour of said top portion.

10. A cabinet for a radio receiver including tuning means and movable control means for said tuning means arranged within said cabinet, means for moving said control means to successive control positions corresponding to predetermined tuning frequencies for said radio receiver including a linearly movable actuating unit extending substantially upwardly toward one of the wallportions of said cabinet, means slidably supporting said actuating unit for linear movement, a control unit operatively engageable with said actuating unit, and means movably supporting said control unit on said one wall portion for movement inwardly and substantially downwardly of said cabinet to linearl-ylmove said actuating unit and operate said movable control means, said control unit having a contour blending in appearance with the contour of said one wall portion.

11. In tuning apparatus for a radio receiver having frequency changing means, rotary control means for said frequency changing means having spaced radial portions thereon, push button means including a reciprocating unit having a pair of spaced operating portionsthereon, means supporting said reciprocating unit for movement axially of said rotary control means, said operating portions on reciprocation of said reciprocating unit being adapted to successively engage adjacent ones of said radial portions and rotate said rotary control means to successive control positions correspondin to predetermined tuning frequencies for said radio receiver, means operatively connecting said rotary control means and frequency changing means, means in operative engagement with said connecting means for moving the same to manually tune said frequency changing means, and frequency indicating means operatively associated with said manual tuning means, with said manual tuning means being movable on actuation of said push button means toin turn move said frequency indicating means to indicate the tuning frequencies of said radio receiver corresponding; to the control positions of said rotary control means.-

12. In tuning apparatus ior-a radio receiver having frequency changing means, rotary control means for said frequency changing means having angularly spaced, radial portions thereon, movable means operatively connecting said frequency changing meansv with said rotary control means including a stop portion, means for-successively rotating said rotary control means to control positions corresponding to predetermined tuning frequencies of said radio receiver and including a reciprocating "unit having a pair of longitudinally spaced operating portionsthereon, means sup-- porting said reciprocating unit for reciprocal movement axially ofsaid rotary control means,

said operating portions on reciprocation of said reciprocating unit being alternately movedinto engagement with "successive ones of said radial portions to rotate said rotary control means an angular distance corresponding to the distance between adjacent ones of saidradial portions, an adjustable member corresponding to each of said radial portions, said adjustable members being successively movable into operative engagement with said stop portion on successive rotation of said rotary control means to its control position, said engagements successively defining themovement in one direction ofsaid movable means, which in turn adjusts" said frequency changing means to tuning positions for said radio receiver corresponding to'thecontrol positions of said rotary control means;

' 13; In tuning apparatus for a radio receiver having-frequency changing means, rotary control means for said frequency changing means having a plurality of adjustable members, movable means operatively connecting said frequency changing means and rotary'control means including a pivotally movable stop unit, axis means pivotally supporting said stop unit, with saidstop unit being rigidly mounted on said axis means and pivotally movable toward and away from'said adjustable members, with said connecting means bein movable in response to movement of said stop unit, push button means rotating said rotary control means to predetermined successive control positions, with one of said adjustable members engaging said stop unit for each of said control positions to define the pivotal movement thereof in one direction, with said pivotal movement moving said connecting means to adjust saidfrequency changing means to a predeter-- mined frequency tuning position correspondingto one of the control positions for'said rotary frequency changing means independently of said rotary control means.

'14. In tuning apparatus fora radio receiver having frame means and including adjustable frequencychanging means, rotary control means for said frequency changing means including a plurality of arcuately arranged adjustable members, movable means operatively connecting said frequency changing means and rotary control means and including a pivoted stop portion having axis portions rotatably supported but axially slidable in said frame'means, said connecting means being movable on pivotal move-' ment of said stop portion said stop portion being pivotally movable toward and away from said adjustable members, push button means rotating said control means -to move said adjustable members in succession into a position for engagement with said pivoted stop portion, engagement of an adjustable member with said stop portion defining afpredetermined tuning position of saidfrequency changing means corresponding to one of the control positions of saidrotary control means, means for manually tuning said frequency changing-means including a rotatable control knob in operative en'- gagement with said connecting means, said control knob being adapted on linear actuation thereof to axially slide said stop portion'out of its engaging position with said adjustable members so that later rotation of said control knob moves said connecting means to tune said frequency changing means independently of said rotary control means, means releasably locking said pivoted stop portion in its position for manual tuning, and means including said push button means for releasing said stop portion from its manual tuning position on initial actuation of said push button meansfor push button tuning.

15. In control apparatus including rotary control means having a plurality of angulariyspaced radially extending portions thereon, means for rotating said rotary control means to successive predetermined control positions including an actuating unit having a pair of spaced operating portions thereon, means supporting said actuating unit for reciprocal movement axially of said rotary control means, one of said operating portions slidably engaging one of said radial portions and rotating said control means when said actuating unit is moved in one direction, and the other of said operating portions slidably engaging a next adjacent radial portion and additionally rotating said rotary control means on movement of said actuating unit as in an opposite direction, the angular rotation of said control means corresponding to the angular spacing between said radial portions, electrical means moving said actuating unit in one direction, spring means moving said actuating unit 0 in an opposite direction, and an energizing circuit for said electrical means, with successive energizing of said electrical means successively rotating'said rotary control means to its control positions to provide for a step-by-step operation of said control apparatus.

16. In radio tuning apparatus having frame means and including frequency changing means with linearly adjustable tuning elements, rotary control means for said frequency changing means rotatably supported in said frame means and including arcuately spaced adjustable members, means for rotating said rotary control means to control positions corresponding to predetermined tuning positions of said linearly adjustable elements, means operatively connect ing said linearly adjustable elements With said rotary control means including a pair of spaced arm members, means pivotally connecting said arms at one end to said linearly adjustable .elements, means pivotally supporting said arms .at their opposite ends on said frame means, .said pivotal supporting'means being slidable in said frame means, a pivoted stop unit, having axis portions near one end thereof rotatably supported in said" frame mean's, and axis means extending between said arm members intermediate the ends thereof forpivotally supporting said stop unit near the opposite end thereof, said pivoted stop unit being pivotally movable toward and away from said adjustable members and into operative engagement with one of said adjustable members when said rotary control means is in a control position, said engagement defininga predetermined tuning position of said linearly adjustable elements. with said axis means, pivotally supporting means, and pivotally connecting means cooperating on pivotal movement of said pivoted unit to move said adjustable elements in a substantially linear path through a distance which is greater than the arc of pivotal movement of said pivoted unit.

17. In control apparatus having rotary control means including angularly spaced radial portions thereon, the combination of means for rotating said control means to predetermined control positions including a reciprocating unit having a pair of operating portions thereon, with a stop portion adjacent one of said operating portions, and means slidably supporting said reciprocating unit for reciprocal movement axially or said rotary control means, said operating portions on reciprocation of said reciprocating unit being alternately moved into siidable engagement with successive ones of said radial portions to rotate said rotary control means an angular distance corresponding to the distance between adjacent ones of said radial portions, with said one operating portion being moved last into said siidable engagement, said angular distance being defined by the engagement of said stop portion with the one of said radial portions being operated on by said operating portions.

18. In tuning apparatus for a radio receiver, including frequency changing mean tunable to a plurality of transmitting stations, rotary control means for said frequency changing means, means for rotating said rotary control means to successive control positions corresponding to the tuning frequencies of preselected ones of said transmitting stations, means for indicating the station being tuned at each of said control positions including a stationary member having arcuately spaced window portions corresponding in number to said control positions, with one of said preselected stations being indicated in each of said window portions, a rotary disc having an opening therein successively movable into axial alignment with said window portions, and means operatively connecting said disc and rotary control means for like angular rotation so that said opening is in axial alignment with one of said window portions for each control position of said rotary control means.

19. In tuning apparatus for a radio receiver,

including frequency changing means tunable to a. plurality of transmitting stations, rotary control means for said frequency changing means, means for rotating said rotary control means to successive control positions corresponding to the tuning frequencies of preselected ones of said transmitting stations, means for indicating the station being tuned at each of said control positions including a stationary member having a plurality of window portions corresponding in number to said control positions, with one of said stations being indicated on each of said window portions, light means for each of said window portions arranged rearwardly thereof, an energizing circuit for all of said light means including a switch unit having arcuately spaced contacts corresponding in number to said light means, a rotatable switch arm, and means rotatably supporting said switch arm on said rotary control means for rotation therewith, said switch arm being in electrical engagement with one of said contacts at each control position of said rotary control means, with said electrical engagement closing the circuit for the light means associated with said one contact to light the same and indicate the station corresponding to the particular control position of said rotary control means.

20. In radio tuning control apparatus adapted to be adjusted to predetermined tuning positions, the combination including control means movable in a step-by-step manner and having succeeding engageable portions thereon, a reciproeating unit for advancing said movable means having a pair of spaced apart operating portions, means for supporting said reciprocating unit for movement in a direction at right angles to the general direction of movement of the control means, with one of said operating portions engaging one of the engageabie portions to initially move said control means upon movement of said reciprocating unit in one direction, and the other or said operating portions engaging a succeeding engageable portion upon movement of said reciprocating unit in the opposite direction to additionally move said control means, said initial and additional movement of said control means normally moving said control means from one predetermined tuning position to another.

21. Control apparatus adapted both for operation to predetermined control positions in an operating range and for operation to all control positions in said range, including in combination movable control means adapted for movement in a step-by-step manner having adjustable portions and including actuating reciprocating means, controllable means, motion transmitting means operatively connecting the adjustable portions and said controllable means including a movable portion directly engageable with an adjustable portion, means including said movable control means for driving said controllable means to predetermined control positions, and manual means for driving said controllable means over the entire operating range thereof, said latter means including means for moving said movable portion out of position for engagement with an adjustable portion and permit movement of at least a part of the transmitting means independent of the movable control means upon operation of said manual means to move said controllable means over the entire operating range.

22. Control apparatus adapted for operation to predetermined control positions in an operating range including in combination movable control means adapted for movement in a stepby-step manner having adjustable portions and including actuating reciprocating means, controllable means, motion transmitting means operatively connecting the adjustable portions in said control means with said controllable means including a portion directly engageable with an adjustable portion, means for locking said engageable portion out of the path of movement of said adjustable portions during movement of said control means from one control position of a second control position, said reciprocating means on movement in one direction engaging and moving said engageable portion into locking position with said locking means. and on movement in an opposite direction acting on said locking means to release said engageable portion, with engagement of said engageable portion with the adjustable portion at said second control position defining a corresponding control position for said controllable means.

RICHARD C. MARHOLZ.

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