Switch assembly including rotary variable resistor

Abstract

Abstract The assembly comprises a main or AC power source on-off switch, an on-off switch for a power source for preheating a picture tube, a switch for the heater circuit of the picture tube and a variable resistor for volume control, all of which may be controlled by a single operating shaft. When the operating shaft is pushed in and rotated to an extreme counterclockwise position, all of the AC power on-off switch, the power source switch for preheating and the switch for the heater circuit on-off are opened. When the operating shaft is rotated from an extreme counterclockwise position to a counterclockwise position, the power source switch for preheating is turned on and, while the shaft is rotatable in the clockwise direction the sound of a television receiver cannot be produced since the AC power and the heater circuit switches are still open at this stage. After the preheating switch is turned on and the shaft is pulled out, the AC and heater circuit switches are now on and the shaft is rotatable in the clockwise direction. As the shaft is turned towards the clockwise direction, the volume of a television receiver will increase. As the shaft is turned in the counterclockwise direction, the volume will decrease, and at the extreme counterclockwise rotational position the volume will be at its minimum and the shaft will be prevented from further rotation in the counterclockwise direction. When the shaft is pushed in, the AC power and heater circuit switches are off and picture and sound on the television receiver will fade away. At this stage, the preheater switch is still on and picture and sound will be produced immediately if the shaft is pulled out. When the shaft is further rotated toward the counterclockwise direction, the preheater switch will be turned off. At this shaft position the preheater switch is open and the shaft cannot be pulled out. The shaft can be pulled out only after it is turned in the clockwise direction and the preheater switch is on. After the preheater switch is turned on, push-pull operation of the shaft is possible at any position within a range of variable resistor rotation angle. While the shaft is pulled out it can be rotated freely and the volume of the television receiver can be readily increased and decreased. The preheater switch cannot be turned off while the shaft is pulled out. The switch can be turned off only when the shaft is pushed in and rotated to an extreme counterclockwise position.

Inventors

• 👤 H Tanaka
• 👤 Y Nakagawa

Bibliographic Details