Justin K Kramer

US Patent:

48518000, Jul 25, 1989

Filed:

Feb 22, 1988

Appl. No.:

7/159012

Inventors:

Richard H. Peterson - Worth IL
Justin Kramer - Los Angeles CA

International Classification:

H01F 702

US Classification:

335229

Abstract:

Electrically and manually operable stop controls for a musical instrument such as an organ are disclosed. One embodiment of the stop control is a drawknob carried by an a transfer plate mounted for horizontal motion adjacent a solenoid having an iron core. Vertical hinge members at opposite ends of the solenoid support the transfer plate. A permanent magnet is mounted on each hinge member in general alignment with the iron core, the hinge members being spaced apart sufficiently to insure that only one permanent magnet at a time is adjacent the iron core, to thereby provide a manual magnetic and gravity-operated toggle motion. Application of an electrical direct current of selected polarity to the solenoid permits electrical shifting of the transfer plate. In a further embodiment, the drawknob is secured to a pivotally mounted armature having a cross-member which carries permanent magnets. Solenoids are mounted at opposite ends of the cross-member to provide electrical shifting of the armature.

US Patent:

47262770, Feb 23, 1988

Filed:

Oct 6, 1986

Appl. No.:

6/915350

Inventors:

Richard H. Peterson - Worth IL
Justin Kramer - Los Angeles CA

International Classification:

G10B 310

US Classification:

84343

Abstract:

Electrically and manually operable stop controls for a musical instrument such as an organ are disclosed. One embodiment of the stop control is a drawknob carried by an a transfer plate mounted for horizontal motion adjacent a solenoid having an iron core. Vertical hinge members at opposite ends of the solenoid support the transfer plate. A permanent magnet is mounted on each hinge member in general alignment with the iron core, the hinge members being spaced apart sufficiently to insure that only one permanent magnet at a time is adjacent the iron core, to thereby provide a manual magnetic and gravity-operated toggle motion. Application of an electrical direct current of selected polarity to the solenoid permits electrical shifting of the transfer plate. In a further embodiment, the drawknob is secured to a pivotally mounted armature having a cross-member which carries permanent magnets. Solenoids are mounted at opposite ends of the cross-member to provide electrical shifting of the armature.