Control system for combustion apparatus

Claim 1

A control system for apparatus of the type in which two flow control devices operate in a relationship to one another, said control system comprising: (a) a jackshaft system driven by rotation means responsive to a first control signal, said jackshaft system having an interconnection to said flow control devices; (b) variable length linkage operatively connecting said jackshaft system and at least one of said flow control devices, said variable length linkage comprising: (i) a first lever operatively connected with at least a part of said jackshaft system; (ii) a connecting link having one end thereof operatively connected to said first lever; (iii) a lever arm having one end thereof operatively connected to said connecting link; (iv) a driven lever associated with said one flow control device and operatively connected to said lever arm; (v) means to adjust the length of said connecting link in response to second control signal; (vi) means to adjust the length of said lever arm in response to a second control signal, whereby the application of a second control signal to either one or both of the adjustment means of said connecting link and said lever arm produces an alteration in said variable length linkage with a subsequent change in relationship of said flow control devices.