Radio tuning apparatus

Claim 2

In radio receiving apparatus of the type including adjustable means for tuning over a predetermined band of frequencies, improved drive means for moving said tuning means at a relatively slow rate for tuning in one direction and at a relatively rapid rate for repositioning in the opposite direction, said drive means comprising: driven wheel means drivingly coupled with said tuning means; a unidirectionally rotatable motor; a lever; means defining a pivot for said lever in provision for rocking movements thereof; first and second solenoid means coupled with said lever, each selectively energizable to rock said lever in one or the other direction; first and second drive wheel means, of different diameters, driven with said motor; said lever being operable, upon energization of said first solenoid means, to rock said lever in one direction to effect a coupling between said first drive wheel means and said driven wheel means in provision of the recited relatively slow drive rate of said tuning means, and, upon energization of said second solenoid means, to rock said lever in the other direction to effect a coupling between said second drive wheel means and said driven wheel means in provision of the recited relatively rapid drive rate of said tuning means.

Claim 3

Drive means according to claim 1, and characterized in that said driven wheel means includes a pair of concentrically rotatable wheels, one of lesser diameter than the other and both being rotatable to move said tuning means, said first and second drive wheel means being journalled for concentric rotation on said lever, said lever, when rocked in said one direction, moving said first drive wheel means into driving engagement with said driven wheel means of lesser diameter, and said lever, when rocked in said other direction, moving said second wheel means into driving engagement with said driven wheel means of greater diameter.

Claim 4

Drive means according to claim 2, and further characterized by the inclusion of a worm driven by said motor, and a worm gear concentric with and drivingly coupled with said first and second drive wheel means, said worm gear being drivingly meshed with said worm throughout the recited rocking movements of said lever.

Claim 5

Drive means according to claim 2, and further characterized in that said first drive wheel means is of lesser diameter than said second drive wheel means.

Claim 6

Drive means according to claim 3, and further characterized in that the recited driving engagement is frictional.

Claim 7

Drive means according to claim 5, and further characterized in that said driven wheel means of lesser diameter includes a circumferential, radially outwardly facing frictional surface, said driven wheel means of greater diameter includes a circumferential axially presented flange defining a radially inwardly facing frictional surface, and in that the common axis of said drive wheel means on said lever extends generally parallel to the common axis of said driven wheel means and through a region intermediate said inwardly facing and outwardly facing frictional surfaces.

Claim 8

Drive means according to claim 5, wherein the recited frictional driving engagement is afforded by serrated surfaces provided on each of said driven wheel means and by flexible and resilient tire means on each of said drive wheel means.

Claim 9

Drive means according to claim 6, wherein the recited frictional driving engagement is afforded by serrated surfaces provided on each of said driven wheel means and by flexible and resilient tire means on each of said drive wheel means.

Claim 10

For use with radio receiving apparatus of the type including adjustable means for tuning over a predetermined band of frequencies, and driven wheel means drivingly coupled with said tuning means, improved drive means for moving such tuning means at a relatively slow rate for tuning in one direction and at a relatively rapid rate for repositioning in the opposite direction, said drive means comprising: a unidirectionally rotatable motor; a lever; means defining a pivot for said lever in provision for rocking movements thereof; first and second solenoid means coupled with said lever, each selectively energizable to rock said lever in one or the other direction; said first and second drive wheel means, of different diameters, driven with said motor; said lever being operable, upon energization of said first solenoid means, to rock said lever in one direction to effect a coupling between said first drive wheel means and such driven wheel means in provision of the recited relatively slow drive rate of such tuning means, and, upon energization of said second solenoid means, to rock said lever in the other direction to effect a coupling between said second drive wheel means and such driven wheeL means in provision of the recited relatively rapid drive rate of such tuning means.

Claim 11

For use with radio receiving apparatus of the type including adjustable means for tuning over a predetermined band of frequencies, and driven wheel means drivingly coupled with said tuning means, improved drive means for moving such tuning means at a relatively slow rate for tuning in one direction and at a relatively rapid rate for repositioning in the opposite direction, said drive means comprising: a unidirectionally rotatable motor; a lever; means defining a pivot for said lever in provision for rocking movements thereof; first and second solenoid means coupled with said lever, each selectively energizable to rock said lever in one or the other direction; said first and second drive wheel means, of different diameters, driven with said motor; said lever being operable, upon energization of said first solenoid means, to rock said lever in one direction to effect a coupling between said first drive wheel means and such driven wheel means in provision of the recited relatively slow drive rate of such tuning means, and, upon energization of said second solenoid means, to rock said lever in the other direction to effect a coupling between said second drive wheel means and such driven wheeL means in provision of the recited relatively rapid drive rate of such tuning means.

Claim 12

Drive means according to claim 9, and characterized in that said first drive wheel means is of lesser diameter than said second drive wheel means, and said first and second drive wheel means are journalled for concentric rotation on said lever, said lever, when rocked in said one direction, moving said first drive wheel means into driving engagement with such driven wheel means, and said lever, when rocked in said other direction, moving said second wheel means into driving engagement with such driven wheel means.

Claim 13

Drive means according to claim 10, and further characterized by the inclusion of a worm driven by said motor, and a worm gear concentric with and drivingly coupled with said first and second drive wheel means, said worm gear being drivingly meshed with said worm throughout the recited rocking movements of said lever.