US3755740A

US3755740A - Engagement delay for a push button controlled voltage generator for a dual band electronically tuned receiver

Info

Publication number: US3755740A
Application number: US00250561A
Authority: US
Inventors: T Maugans
Original assignee: Motors Liquidation Co
Current assignee: Motors Liquidation Co
Priority date: 1972-05-05
Filing date: 1972-05-05
Publication date: 1973-08-28
Anticipated expiration: 1990-08-28

Abstract

A ratchet engagement delay for a tuning voltage generator having a first turret for supplying a voltage for tuning a radio receiver in the AM frequency band and a second turret for supplying a voltage for tuning the radio receiver in the FM frequency band. A first ratchet mechanism has a driven member secured to the first turret for rotation therewith and a drive member which is rotated by a first push button actuator. A second ratchet mechanism has a driven member secured to the second turret for rotation therewith and a drive member which is rotated by a second push button actuator. A ratchet engagement mechanism is responsive to the actuation of the first push button actuator to engage the drive and driven members of the first ratchet mechanism after initial rotation of the driven member and responsive to the actuation of the second push button actuator to engage the drive and driven members of the second ratchet mechanism after initial rotation of the drive member to provide a ratchet engagement delay upon the first actuation of the first or second push button actuator after the other of said actuators has been actuated.

Description

United States Patent 1 Maugans Aug. 28, 1973 ENGAGEMENT DELAY FOR A PUSH BUTTON CONTROLLED VOLTAGE GENERATOR FOR A DUAL BAND ELECTRONICALLY TUNED RECEIVER [75] Inventor: Terrance W. Maugans, Kokomo,

Ind.

[73] Assignee: General Motors Corporation,

Detroit, Mich.

[22] Filed: May 5, 1972 21 Appl. No.: 250,561

Primary ExaminerBenedict V. Safourek Attorney-C. R. Meland, Howard N. Conkey et a].

[5 7 ABSTRACT A ratchet engagement delay for a tuning voltage generator having a first turret for supplying a voltage for tuning a radio receiver in the AM frequency band and a second turret for supplying a voltage for tuning the radio receiver in the FM frequency band. A first ratchet mechanism has a driven member secured to the first turret for rotation therewith and a drive member which is rotated by a first push button actuator. A second ratchet mechanism has a driven member secured to the second turret for rotation therewith and a drive member which is rotated by a second push button actuator. A ratchet engagement mechanism is responsive to the actuation of the first push button actuator to engage the drive and driven members of the first ratchet mechanism after initial rotation of the driven member and responsive to the actuation of the second push button actuator to engage the drive and driven members of the second ratchet mechanism after initial rotation of the drive member to provide a ratchet engagement delay upon the first actuation of the first or second push button actuator after the other of said actuators 3 Claims, 8 Drawing Figures [52] US. Cl. 325/315, 74/10 R, 325/459, 325/468 [51] Int. Cl. 1104b 1/08 [58] Field of Search 74/10 R; 325/315, 325/452, 458, 459, 464, 468; 334/11, 20, 17, 47

[56] References Cited UNITED STATES PATENTS 3,327,221 6/1967 Rieth 325/391 3,432,760 3/1969 Andzer 325/452 3,596,216 7/1971 Walsh 334/20 X has been actuated.

J j E; E 0

L) O z z Z Z '3 I) 1- 2 2 LL ENGAGEMENT DELAY FOR A PUSH BUTTON CONTROLLED VOLTAGE GENERATOR FOR A DUAL BAND ELECTRONICALLY TUNED RECEIVER This invention relates to an apparatus for switching a voltage tuned radio receiver between first and second frequency bands and for selecting among memorized voltages corresponding to desired frequencies in either the AM or FM frequency bands and, more specifically, this invention relates to such an apparatus for switching between the AM and FM frequency bands without changing the previously selected frequency on each respective band and for selecting among a plurality of voltages representing memorized frequencies in the respective frequency bands by the use of two push button actuators.

An apparatus for generating tuning voltages for a dual band radio receiver by the use of a pair of turrets containing potentiometers associated with the respective bands is generally described in Applicants copending application Al4,680 which is assigned to the assignee of this invention. This invention is directed toward a mechanism for switching a radio receiver between first and second frequency bands and for rotating a pair of turrets such as described in the above identified copending application.

The principal feature of this invention is an apparatus for switching from one frequency band to another frequency band by the actuation of a push button Without varying the previous frequency to which that respective band was tuned, with subsequent actuations of the push button being effective to rotate a turret to vary the tuned frequency of the radio receiver.

The invention may be best understood by reference to the following description of the preferred embodiment of this invention and the drawings in which:

FIG. 1 is a front elevation of the tuning voltage generator for an electronically tuned radio receiver illustrating the various control elements;

FIG. 2 is a front elevation of the tuning voltage generator as viewed from directly behind the face plate of FIG. 1;

FIG. 3 is a schematic drawing of the turrets for memorizing a plurality of tuning voltages and the power input terminals and signal pickoffs thereof as viewed along lines 33 of FIG. 1;

FIG. 4 is a rear elevation of the tuning voltage generator as viewed along lines 4-4 of FIG. 6 illustrating the contact board effective for switching the receiver between first and second frequency bands;

FIG. 5 is a schematic drawing of the ratcheting mechanisms as viewed along lines 5-5 of FIG. 2;

FIG. 6 is a schematic drawing of the ratcheting mechanism as viewed along lines 6-6 of FIG. 2;

FIG. 7 is a schematic drawing of the tuning apparatus for positioning the wiper arms of the potentiometers in the turrets as viewed along lines 7-7 of FIG. 6; and

FIG. 8 is a schematic drawing of the ratcheting mechanisms as viewed along lines 8-8 of FIG. 5.

Referring to FIG. 1, a face plate 10 includes a meter 12 having an AM scale 14 and an FM scale 16 which cooperate with an indicator needle 18 to provide an indication of the tuned frequency of an electronically tuned radio receiver in either the AM or FM frequency bands. An on-off volume control knob 20 and a tone control knob 22 are provided to perform the conventional functions represented thereby. An AM push button 24 is provided for switching the radio receiver for operation in the AM frequency band and for selecting one of a plurality of memorized AM tuning voltages representing desired frequencies in the AM band and an FM push button 26 is provided for switching the radio receiver for operation in the FM frequency band and for sequentially selecting a number of memorized FM tuning voltages representing desired frequencies in the FM frequency band. A tuning knob 28 is provided to effect the generation of the desired tuning voltages for tuning the radio receiver.

Referring to FIG. 3, there is shown an AM turret 30 and an FM turret 32 mounted for rotation as will be hereinafter described with reference to FIGS. 5 and 6. Each of the

turrets

30 and 32 contain a plurality of potentiometer assemblies each of which has an output terminal 34 upon which a gear 36 is secured. Rotation of the gear is effective for positioning the wiper arm of the potentiometer assembly associated therewith. The structure of the

turrets

30 and 32 and the potentiometer assemblies carried thereby are described in Applicants copending application Al4,680, which is assigned to the assignee of the present invention, to which reference may be made for specific details. Consequently, those details will not be described in this application.

Power is applied to the potentiometer assemblies in the AM turret 30 and the FM turret 32 by

brushes

38, 40, 42 and 44 which engage respectively

slip rings

46, 48, 50 and 52. The

brushes

38 and 40 are connected to the positive terminal of an external voltage supply and the brushes 42 and 44 are connected to an external ground.

As the AM turret 30 is rotated, the output terminals 34 of the potentiometer assemblies carried thereby sequentially engage a signal pick-off wire 54. The output voltage of the potentiometer assembly associated with the output terminal 34 engaged by the signal pick-off wire 54 is supplied to the radio receiver to effect tuning thereof in the AM frequency band and is supplied to the meter 12 of FIG. 1 to position the indicator needle 18 so as to indicate the AM frequency to which the receiver is tuned. When the FM turret 32 is rotated, the output terminals 34 of the potentiometer assemblies carried thereby sequentially engage a signal pick-off wire 56. The output voltage of the potentiometer assembly associated with the output terminal 34 engaged by the signal pick-ofi wire 56 is supplied to the radio receiver to effect tuning thereof in the FM frequency band and is supplied to the meter 12 of FIG. 1 to position the indicator needle 18 so as to indicate the FM frequency to which the receiver is tuned.

As described in Applicants aforementioned copending application, the output voltage of each of the potentiometer assemblies carried by the AM turret 30 and the FM turret 32 can be varied by rotating the gears 36 associated therewith until the output voltage at the corresponding output terminal 34 is of the desired magnitude. In this manner, each of the potentiometer assemblies can be adjusted so as to memorize a voltage repre senting a desired frequency in either the AM or FM frequency band. Thereafter, any one of those frequencies may be selected merely by rotation of the AM turret 30 or the FM turret 32 until the signal pick-off

wire

54 or 56, respectively, engages the output terminal 34 of the potentiometer assembly which supplies the voltage corresponding to the selected frequency and by switching the receiver for AM or FM reception.

Referring to FIGS. 5 and 6, the AM turret 30 is mounted by a shaft 57 in the back wall of a support structure 58 for rotational movements relative thereto. Although not shown in FIG. 6, the FM turret 32 similarly is mounted in the same horizontal plane in the back wall of the support structure 58 for rotational movements relative thereto. The AM turret 30 has secured thereto an insulating cylinder 60 which is mounted in a bracket 62 for rotational movements relative thereto, the bracket 62 being attached to the support structure 58 by means of screws 64. The cylinder 60 and the AM turret 30 have a common axis of rota tion. Similarly, the FM turret 32 has secured thereto an insulating cylinder 66 which is mounted in the bracket 62 for rotational movements relative thereto, the cylin der 66 and the FM turret having a common axis of rotation. Insulating

rings

69 and 70 are carried by the insulating cylinders 60 and 66, respectively, to isolate the

slip rings

46 and 48 from the bracket 62.

The AM turret 30 has associated therewith a one-way drive mechanism 68 which, in the preferred embodiment, is a ratcheting mechanism having a toothed driven member 70 positioned within the insulating cylinder 60 and secured to the AM turret 30 for rotation therewith and a toothed drive member 72, the teeth on the driven member 70 defining circumferentially spaced indexing portions. The drive member 72 is supported by an actuator 74 which extends through a slot 78 in the drive member 72 and terminates in a piston 80 which is housed within a cylindrical opening 82 around the rotational axis of the AM turret 30. A compression spring 84 engages the piston 80 and the back portion of the AM turret 30 and biases the actuator 74 in an extended or outward position.

The FM turret 32 has associated therewith a one-way drive mechanism 86, shown in the preferred embodiment to be a ratcheting mechanism, having a toothed driven member 88 positioned within the insulating cylinder 66 and secured to the FM turret 32 for rotation therewith and a toothed drive member 90, the teeth on the driven member 88 defining circumferentially spaced indexing portions. The drive member 90 is supported by an actuator 92 which extends through a slot 94 (FIG. 8) and terminates in the FM turret 32 in the same manner as the actuator 74 terminates within the AM turret 30. The actuator 92 is also biased toward its extended position by a compression spring identical to the spring 84.

A compression spring 96 engages a front wall of the support structure 58 and one shoulder of an annular flange 98 on the drive member 72. The opposite shoulder of the annular flange 98 is engaged by one arm of g a ratchet engagement control lever 100. A compression spring 102 engages the front portion of the support structure 58 and one shoulder of an annular flange 104 on the drive member 90. The opposite shoulder of the annular flange 104 is engaged by a second arm of the ratchet engagement control lever 100. The compression springs 96 and 102 tend to bias the

respective drive members

72 and 90 into engagement with the driven

members

70 and 88, respectively. The ratchet engagement control lever is vertically supported by tabs 106 which project through respective slots in the bracket 62 which permit a rocking motion of the lever 100. The tabs 106 are maintained within the slots in the bracket 62 by the force exerted on the arms of the ratchet engagement control lever 100 by the shoulders of the annular flanges 98 and 104 due to the force of the compression springs 96 and 192.

The actuators '74 and 92 are each twisted so as to form a helix and project through respective slots 108 and 110 in the front portion of the support structure 58. When the

actuators

74 and 92 are fully extended, the surfaces of the helix do not project through the respective slots 108 and 110 which serve to support the

actuators

74 and 92 and prevent them from rotating. The AM push button 24 of FIG. 1 is mounted on the end of the actuator 74 and the FM push button 26 of FIG. 1 is mounted on the end of the actuator 92.

When either the AM or FM push button is pushed to move the

respective actuator

74 or 92 inward, the

slots

78 and 94 in the

drive members

72 and 90 function as cam followers and the helix portions of the

actuator

74 and 90 serve as cams which engage the

slots

78 and 94 of the

drive members

72 and 90 which are rotated thereby in a clockwise direction. As can be seen, if the teeth of the drive member 72 and the teeth of the driven member are meshed when the push button 24 is actuated, the drive member 72 is rotated from a fixed position to a second position which defines a predetermined angle of rotation which in turn rotates the driven member 70 and, consequently, the AM turret 30 through the same angle. The degree of twist in the actuator 74 is such as to make the angular movement of the AM turret 30 of such a magnitude so as to rotate one of the output terminals 34 of the potentiometer assemblies within the AM turret 30 out of engagement with the signal pick-off wire 54 and rotate the output terminal 34 of the following potentiometer assembly in the AM turret 30 into engagement with the signal pick-off wire 54. In like manner, if the teeth of the drive member and the teeth of the driven member 88 are meshed when the push button 26 is actuated, the drive member 90 is rotated from a first position to a second position which define a predetermined angle of rotation which in turn rotates the driven member 88 and, consequently, the FM turret 32 through the same angle. The degree of twist in the actuator 92 is such as to make the angular movement of the FM turret 32 of such a magnitude so as to rotate the output terminal 34 of one of the potentiometer assemblies carried by the FM turret 32 out of engagement with the signal pick-off wire 56 and to rotate the output terminal 34 of the following potentiometer assembly in the FM turret 32 into engagement with the signal pick-off wire 56. When the actuated

push button

24 or 26 is released the respective actuating member 743 or 92 is moved to its extended position as previously described to rotate the

drive member

72 or 90 in the reverse direction to its original position where its teeth again mesh with the teeth of the driven

member

70 or 88. Due to the nature of the oneway drive means, the AM turret 30 or the FM turret 32 is not rotated in the reverse direction.

Referring to FIGS. 2,5, 6 and 8, an actuator plate 112 is mounted on the front portion ofv the support structure 58 by screws lldwhich project through slots in the actuator plate 112 into the front wall of the support structure 58. The slots in the actuator plate 112 permit lateral movement of the actuator plate 1 l2 relative to the front wall of the support structure 58. The actuator 74 has a wedge 116 secured thereto and the actuator 92 has a wedge 1 18 secured thereto. The actuator 74 and the wedge 116 form a cam having a lost motion portion 120 and a working portion formed by the surface of the wedge 116 which engages a cam follower 122 on the actuator plate 112 which is shifted laterally by the wedge 116 when the push button 24 is actuated as shown in the broken line position in FIG. 5. Similarly, the actuator 92 and the wedge 118 form a cam having a lost motion surface 124 and a working surface formed by the wedge 118. When the push button 26 is actuated, the wedge 118 engages a cam follower 126 on the actuator plate 112 which is shifted laterally thereby relative to the support structure 58.

The actuator plate 112 includes a tab 128 which engages the arms of the ratchet engagement control lever 100 such that when the AM push button 24 is actuated and the actuator plate 112 is shifted laterally thereby, the ratchet engagement control lever is rocked by the tab 128 to permit the compression spring 96 to move the drive member 72 into engagement with the driven member 70 and to move the drive member 90 against the force of the compression spring 102 out of engagement with the driven member 88 as shown in FIG. 5. In similar manner, when the FM push button 26 is actuated, the actuator plate 112 is shifted by the wedge 118 to move the tab 128 so as to rock the ratchet engagement control lever 100 to permit the compression spring 102 to engage the drive member 90 and the driven member 88 and to move the drive member 72 against the force of the compression spring 96 out of engagement with the driven member 70. Due to the lost motion surfaces 120 and 124 of the

actuators

74 and 92 respectively, the

drive members

72 and 90 are rotated by the

respective actuators

74 and 92 from their first positions toward their second positions prior to the engagement of the wedges 116 and 118 with the

cam followers

122 and 126. Consequently, if the push button 24 or the push button 26 associated with the oneway drive mechanism 68 or 86 which is disengaged is actuated, the

drive member

72 or 90 associated therewith is rotated prior to the engagement with the driven

member

70 or 88 and the meshing of the teeth thereon with the teeth on the respective driven

member

70 or 88. Therefore, the rotation of the

drive members

72 or 90 is ineffective for rotating the AM turret 30 or the FM turret 32 until returned to the first position where the teeth mesh in a driving relationship with the teeth on the driven

members

70 or 88. Consequently, the first actuation of the

actuator

74 or 92 after the remaining

actuator

74 or 92 has been actuated serves to move the actuator plate 1 12 to permit the engagement of the respective one-way drive means 68 or 86 without rotation of the AM turret 30 or the FM turret 32. Subsequent actuations of that

actuator

74 or 92 are then effective for rotating the

respective turret

30 or 32.

Referring to FIGS. 2, 4, 6 and 7, the tuning knob 28 is mounted on a tuning shaft 130 which passes through slots in the face plate and the front and back walls of the support structure 58 so as to have lateral freedom of movement relative thereto. The shaft 130 is supported by the actuator plate 112 as shown in FIG. 6 so as to have rotational movement relative thereto. The shaft 130 is also shiftable longitudinally of its axis relative to the actuator plate 112. A compression spring 132 engages a disk 134 which is secured to the end of the shaft 130 opposite the tuning knob 28 and the back portion of the actuating member 112 so as to bias the shaft 130 and the tuning knob 28 to an inward position as shown in FIG. 6.

A tuning gear 136 is carried by the shaft 130 for rotation therewith and is shifted by movement of the actuator plate 112 so as to be engageable with the gears 36 on the AM turret 30 when the AM push button 24 is actuated and to be engageable with the gears 36 on the FM turret 32 when the FM push button 26 is actuated. The tuning gear 136 engages the gear 36 on either the AM turret 30 or the FM turret 32 when the tuning knob 28 is pulled to shift the gear 136 against the return force of the compression spring 132. Thereafter, rotation of the tuning knob 28 is effective for positioning the wiper arm of the potentiometer assembly associated with the gear 36 engaged by the tuning gear 136 to generate the desired tuning voltage representing a desired frequency. As can be seen, repeated actuations of the AM push button 24 and the FM push button 26 sequentially position all of the gears 36 into position so that they may be engaged by the gear 136 so as to obtain the desired memorized tuning voltages.

To effect electrical switching between the AM and FM portions of the radio receiver, a contact board 138 has a movable portion 140 joined to the back portion of the actuating member 112 by a coupler 142. The movable portion 140 includes contacts 144 which are moved relative to stationary contacts 146 to effect the electrical switching between the AM and FM frequency bands of the radio receiver as the actuating member 112 is shifted by actuations of the AM push button 24 and the FM push button 26.

In operation of the apparatus described, the first actuation of the AM push button 24 after the actuation of the FM push button 26 is effective for electrically switching the radio receiver for operation in the AM frequency band and is effective for engaging the drive member 72 and the driven member of the one-way drive mechanism 68 but is ineffective for rotating the AM turret 30. Thereafter, subsequent actuations of the AM push button 24 are effective for rotating the AM turret 30 to vary the tuned frequency of the radio receiver in accordance with the memorized voltages represented by the potentiometer assemblies in the AM turret 30 and, conversely, the first actuation of the FM push button 26 after the actuation of the AM push button 24 is effective for electrically switching the receiver for FM reception and for engaging the drive member and the driven member 88 of the one-way drive mechanism 86 but is ineffective for rotating the FM turret 32. Subsequent actuations of the FM push button 26 are effective for rotating the FM turret 32 to vary the tuned frequency of the receiver in accordance with the memorized voltages represented by the potentiometer assemblies in the FM turret 32. As can be seen, if the AM push button 24 and the FM push button 26 are alternately actuated, the receiver is effectively switched between AM and FM reception without varying the previously selected tuned frequencies in the respective frequency bands, as the AM turret 30 and the FM turret 32 remain stationary. To vary the frequencies in the AM or FM frequency band, it is required that the AM push button 24 or the FM push button 26 be actuated twice in succession or to manually pull and rotate the tuning knob 28 so as to rotate the gear 36 to vary the voltage picked off by the signal pick-ofi'

wires

54 or 56.

The detailed description of the preferred embodiment of the invention for the purpose of explaining the principles thereof is not to be considered as limiting or restricting the invention, since many modifications may be made by the exercise of skill in the art without departing from the scope of the invention.

I claim:

1. An apparatus for switching a voltage tuned radio receiver between first and second frequency bands and for rotating a turret comprising drive means; driven means coupled to the turret for rotation therewith; first selectively operable means for imparting a drive motion to the drive means when said first selectively operable means is operated; second selectively operable means; first actuating means operably associated with the first selectively operable means for engaging the drive and driven means when said first selectively operable means is operated, the first actuating means including lost motion means for permitting the first selectively operable means to impart a drive motion to the drive means relative to the driven means prior to the engagement of the drive and driven means; second actuating means operably associated with the second selectively operable means for disengaging the drive and driven means when said second selectively operable means is operated; biasing means for maintaining the drive and driven means engaged after initial engage ment by the first actuating means until said drive and driven means are disengaged by the operation of the second selectively operable means; and switching means responsive to the first and second selectively operable means for switching the radio receiver for operation in the first frequency band when the first selectively operable means is operated and for switching the radio receiver for operation in the second frequency band when the second selectively operable means is operated.

2. An apparatus for rotating first and second turrets of a voltage tuned radio receiver comprising first drive means; second drive means; first driven means coupled to the first turret for rotation therewith; second driven means coupled to the second turret for rotation therewith; first selectively operable means for imparting a drive motion to the first drive means when said first selectively operable means is operated; second selectively operable means for imparting a drive motion to the second drive means when said second selectively operable means is operated; first actuating means operably associated with the first selectively operable means for engaging the first drive and driven means and disengaging the second drive and driven means when said first selectively operable means is operated, the first actuating means including first lost motion means for permitting the first selectively operable means to impart a drive motion to the first drive means relative to the driven means prior to the engagement of the first drive and driven means; second actuating means operably associated with the second selectively operable means for engaging the second drive and driven means and disengaging the first drive and driven means when said second selectively operable means is operated, the second actuating means including second lost motion means for permitting the second selectively operable means to impart a drive motion to the second drive means relative to the second driven means prior to the engagement of the second drive and driven means; first biasing means for maintaining the first drive and driven means engaged after initial engagement by the first actuating means until said drive and driven means are disengaged by the operation of the second selectively operable means; and second biasing means for maintaining the second drive and driven means engaged after initial engagement by the second actuating means until said drive and driven means are disengaged by the operation of the first selectively operable means.

3. An apparatus for rotating first and second turrets of a voltage tuned radio receiver and for switching said receiver between first and second frequency bands comprising first one-way drive means including first driven means coupled to the first turret for rotation therewith, said first driven means including indexing portions circumferentially spaced therearound and first drive means having driving portions circumferentially spaced at a predetermined angle therearound which mesh in driving relationship with the indexing portions of the first driven means when said first drive means is in engagement with the first driven means while the first drive means is in a first position; second one-way drive means including second driven means coupled to the second turret for rotation therewith, said second driven means including indexing portions circumferentially spaced at the predetermined angle therearound and second drive means having driving portions circumferentially spaced at the predetermined angle therearound which mesh in driving relationship with the indexing portions of the second driven means when said second drive means is in engagement with the second driven means while the second drive means is in asecond position; first selectively operable means for rotating the first drive means from the first position through the predetermined angle and returning the first drive means to the first position each time said first selectively operable means is operated; second selectively operable means for rotating the second drive means from the second position through the predetermined angle and returning the second drive means to the second position each time said second selectively operable means is operated; first actuating means operably associated with the first selectively operable means for positioning the first drive means into engagement with the first driven means and disengaging the second drive means from the second driven means when said first selectively operable means is operated, the first actuating means including first lost motion means for permitting the first selectively operable means to rotate the first drive means from its first position prior to the engagement of the first drive and driven means; second actuating means operably associated with the second selectively operable means for positioning the second drive means into engagement with the second driven means and disengaging the second drive means from the second driven means when said second selectively operable means is operated, the second actuating means including second lost motion means for permitting the second selectively operable means to rotate the second drive means from the second position prior to the engagement of the second drive and driven means; first biasing means for maintaining the first drive and driven means engaged after initial engagement by the first actuating means until said first drive and driven means are disengaged by the operation of the second selectively operable means; second biasing means for maintaining the second drive and driven means engaged after initial engagement by the second actuating means until said second drive and driven means are disengaged by the operation of the second selectively operable means; and switching ceiver for operation in the first frequency band when the first selectively operable means is operated and for switching the receiver for operation in the second frequency band when the second selectively operable means operably associated with the first and second semeans is operated.

lectively operable means for switching the radio reremit:

3 UNITED STATES PATENTDFFEE QERTEFIDATE OF CORREGTWN Patent No. 3,755, 74-0 Dated August 28, 1973 Inventor-(s) Terrance W. Maugans It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 1, line 21, change "application A-l4,680" to application .Serial No. 241,241, now Patent 3,739,307

Column 2, line 22, change "application A-l4,680" to applicationSerial No. 241,241, now Patent 3,739,307

Signed and sealed this 5th day of February 1974.

(SEAL) Attest:

EDWARD M.FLETCHER,JR. RENE D. TEGTMEYER Attesting Officer Acting Commissioner of Patents

Claims

1. An apparatus for switching a voltage tuned radio receiver between first and second frequency bands and for rotating a turret comprising drive means; driven means coupled to the turret for rotation therewith; first selectively operable means for imparting a drive motion to the drive means when said first selectively operable means is operated; second selectively operable means; first actuating means operably associated with the first selectively operable means for engaging the drive and driven means when said first selectively operable means is operated, the first actuating means including lost motion means for permitting the first selectively operable means to impart a drive motion to the drive means relative to the driven means prior to the engagement of the drive and driven means; second actuating means operably associated with the second selectively operable means for disengaging the drive and driven means when said second selectively operable means is operated; biasing means for maintaining the drive and driven means engaged after initial engagement by the first actuating means until said drive and driven means are disEngaged by the operation of the second selectively operable means; and switching means responsive to the first and second selectively operable means for switching the radio receiver for operation in the first frequency band when the first selectively operable means is operated and for switching the radio receiver for operation in the second frequency band when the second selectively operable means is operated.

3. An apparatus for rotating first and second turrets of a voltage tuned radio receiver and for switching said receiver between first and second frequency bands comprising first one-way drive means including first driven means coupled to the first turret for rotation therewith, said first driven means including indexing portions circumferentially spaced therearound and first drive means having driving portions circumferentially spaced at a predetermined angle therearound which mesh in driving relationship with the indexing portions of the first driven means when said first drive means is in engagement with the first driven means while the first drive means is in a first position; second one-way drive means including second driven means coupled to the second turret for rotation therewith, said second driven means including indexing portions circumferentially spaced at the predetermined angle therearound and second drive means having driving portions circumferentially spaced at the predetermined angle therearound which mesh in driving relationship with the indexing portions of the second driven means when said second drive means is in engagement with the second driven means while the second drive means is in a second position; first selectively operable means for rotating the first drive means from the first position through the predetermined angle and returning the first drive means to the first position each time said first selectively operable means is operated; second selectively operable means for rotating the second drive means from the second position through the predetermined angle and returning the second drive means to the second position each time said second selectively operable means is operated; first actuating means operably associated with the first selectively operable means for positioning the first drive means into engagement with the first driven means and disengaging the second drive means from the second driven means when said first selectively operable means is operated, the first actuating means including first lost motion means for permitting the first selectively operable means to rotate the first drive means from its first position prior to the engagement of the first drive and driven means; second actuating means operably associated with the second selectively operable means for positioning the second drive means into engagement with the second driven means and disengaging the second drive means from the second driven means when said second selectively operable means is operated, the second actuating means including second lost motion means for permitting the second selectively operable means to rotate the second drive means from the second position prior to the engagement of the second drive and driven means; first biasing means for maintaining the first drive and driven means engaged after initial engagement by the first actuating means until said first drive and driven means are disengaged by the operation of the second selectively operable means; second biasing means for maintaining the second drive and driven means engaged after initial engagement by the second actuating means until said second drive and driven means are disengaged by the operation of the second selectively operable means; and switching means operably associated with the first and second selectively operable means for switching the radio receiver for operation in the first frequency band when the first selectively operable means is operated and for switching the receiver for operation in the second frequency band when the second selectively operable means is operated.