Control system for an appliance or the like, control device therefor and methods of making the same

• US 5,300,759 A
• Filed: 05/14/1992
• Issued: 04/05/1994
• Est. Priority Date: 02/20/1990
• Status: Expired due to Fees

• Current Assignee: Robertshaw Controls Company (Schneider Electric SE)
• Original Assignee: Robertshaw Controls Company (Schneider Electric SE)
• Inventors: Dodson, David M.
• Primary Examiner(s): Paschall, Mark H.
• Application Number:
  US07/882,837
• Time in Patent Office: 691 Days
• Field of Search: 219/505, 219/506, 219/491, 219/497, 219/501, 219/487, 219/494, 340/584, 340/582, 340/706, 338/68
• US Class Current: 219/506
• CPC Class Codes: H05B 3/74 Non-metallic plates , e.g. vitroceramic, ceramic or glassceramic hobs, also including power or control circuits

Abstract

A control system, a control device therefor and methods of making the same are provided, the control system comprising a source of energy, an output producing unit that uses the energy to produce the output thereof, a control device having control structure for interconnecting the source of energy to the unit, the control device having a rotatable shaft that sets the control structure in different positions thereof in relation to the rotational set position of the shaft from an "off" position thereof, the control structure having the amount of the energy passing therethrough from the source to the unit being different for each set position thereof, indicating structure operatively associated with the shaft for visually indicating the set position of the shaft and, thus, the amount of energy being fed by the control structure to the unit, and sensing structure operatively associated with the shaft that senses the set position of the shaft and electronically displays that sensed position of the shaft whereby the sensing structure comprises the indicating structure.

Claims

1. In a control system comprising a source of gas fuel energy, an output producing heating unit that uses said energy to produce said output thereof, a control device having control means that comprises an infinitely variable valve means for interconnecting said source of energy to said unit, said control device having a rotatable shaft provided with opposed ends of which one of said opposed ends is mechanically interconnected to said valve means and of which the other of said opposed ends is interconnected to a control knob that sets said valve means in different positions thereof in relation to the rotational set position of said shaft from an "off" position thereof by rotation of said control knob, said valve means having the amount of said energy passing therethrough from said source to said unit being different for each set position thereof, and indicating means operatively associated with said shaft for visually indicating the set position of said shaft and, thus, the amount of energy being fed by said valve means to said unit, the improvement comprising sensing means operatively associated with said shaft that senses the set position of said shaft and electronically displays that sensed position of said shaft whereby said sensing means comprises said indicating means, said sensing means comprising a potentiometer having a housing means and a movable actuator carried thereby, said actuator having an opening passing therethrough, said shaft having an intermediate part thereof telescopically disposed in said opening of said actuator and being splined thereto whereby said shaft carries said potentiometer and said valve means in coaxially aligned relation so that rotation of said shaft by said control knob mechanically rotates said actuator therewith at the same time said shaft is mechanically setting said valve means.

2. A control system as set forth in claim 1 wherein said heating unit comprises a surface element of a cooking apparatus.

3. A control system as set forth in claim 1 wherein said sensing means comprises a printed circuit board means having opposed sides and an opening passing through said sides, said potentiometer being carried on one of said sides of said board and said control device being carried on the other of said sides of said board and having said shaft passing through said opening to interconnect with said potentiometer.

4. In a control device for interconnecting a source of gas fuel energy with an output producing heating unit that uses said energy to produce said output thereof, said control device having control means that comprises an infinitely variable valve means for interconnecting said source of energy to said unit, said control device having a rotatable shaft provided with opposed ends of which one of said opposed ends is mechanically interconnected to valve means and of which the other of said opposed ends is interconnected to a control knob that sets said valve means in different positions thereof in relation to the rotational set position of said shaft from an "off" position thereof by rotation of said control knob, said valve means being adapted to have the amount of said energy passing therethrough from said source to said unit being different for each set position thereof, and indicating means operatively associated with said shaft for visually indicating the set position of said shaft and, thus, the amount of energy being fed by said valve means to said unit, the improvement comprising sensing means operatively associated with said shaft that senses the set position of said shaft and electronically displays that sensed position of said shaft whereby said sensing means comprises said indicating means, said sensing means comprising a potentiometer having a housing means and a movable actuator carried thereby, said actuator having an opening passing therethrough, said shaft having an intermediate part thereof telescopically disposed in said opening of said actuator and being splined thereto whereby said shaft carries said potentiometer and said valve means in coaxially aligned relation so that rotation of said shaft by said control knob mechanically rotates said actuator therewith at the same time said shaft is mechanically setting said valve means.

5. A control device as set forth in claim 4 wherein said heating unit comprises a surface element of a cooking apparatus.

6. A control device as set forth in claim 4 wherein said sensing means comprises a printed circuit board means having opposed sides and an opening passing through said sides, said potentiometer being carried on one of said sides of said board and said control device being carried on the other of said sides of said board and having said shaft passing through said opening to interconnect with said potentiometer.