Cam for control of combustion fuel-to-air ratio

Claim 2

A positive drive cam and follower assembly comprising: a. a rotatable element having an arcuate part displaced radially from its axis of rotation, b. a row of adjusting screw means extending radially from said arcuate part and turnable therein, c. cam member supporting head means relatively rotatably mounted on said screw means, d. a cam member, increments of which are deformable in a radial direction, said cam member having radially opposed surfaces and being engaged at spaced intervals by head means in a row, said head means having laterally extending slot means receiving said cam member and positively engaging each of said opposed cam surfaces, whereby selective rotation of the adjusting screw means will positively deform increments of said cam member correspondingly radially toward or away from said rotatable element, and e. a cam follower means including spaced apart roller means in positive contact engagement respectively with said opposite surfaces of the cam member so that the follower means are compelled to move in radial directions corresponding with the profile of the cam member.

Claim 3

The invention set forth in claim 1 wherein: a. said cam member comprises a pair of metal strips which are similarly contoured and spaced apart in parallelism with each other, b. the slot means of said head means snugly engaging and supporting each of said strips at spaced intervals along their lengths.

Claim 4

The invention set forth in claim 2 wherein: a. said metal strips comprising the cam member extend laterally outwardly in opposite directions from the slots to define the said opposed cam surfaces, b. said follower means comprising yoke means on each side of which are pairs of roller means having parallel axes of rotation and which have their peripheries spaced part a distance that is substantially equal to the thickness of the metal strips, whereby the profile of the cam member strips that is presented continuously between the rollers due to cam rotation positively drives the cam follower means bidirectionally.

Claim 5

A cam assembly for closely coordinating the condition of the fuel and air flow control means of a burner wherein a cam follower means is driven in a positive manner bidirectionally to control the burner, comprising: a. a rotatable element having an axially projecting curved flange means, b. a row of adjusting screw means radially threaded through the flange means and having unthreaded portions at their ends remote from the flange means, c. a head means disposed on each unthreaded portion of the screw means and means retaining the head means thereon but permitting rotation of the screw means therein for individually advancing or retracting said head means radially, d. said head means each having opposed laterally extending slots defining parallel opposed rows of slots, e. a pair of thin deformable continuous metal cam strips each having a corresponding edge spaced from and disposed in parallel with the other and with said edges being engaged in said respective rows of slots so that a cam profile is defined by the other edges of the strips which project from the slots, the said other edges having opposed cam surfaces, f. a cam folloWer on which are mounted opposed pairs of rollers which have parallel axes of rotation, the peripheries of the rollers in a pair being spaced apart a distance that is substantially equal to the thickness of the cam strip, said roller peripheries in a pair being in contact simultaneously with said opposed cam surfaces for positively driving said follower linearly in correspondence with the cam profile increment that is presented between the rollers by rotation of the said rotatable element.

Claim 6

A cam assembly for closely coordinating the condition of the fuel and air flow control means of a burner wherein a cam follower means is driven in a positive manner bidirectionally to control the burner, comprising: a. a rotatable element having an axially projecting curved flange means, b. a row of adjusting screw means radially threaded through the flange means and having unthreaded portions at their ends remote from the flange means, c. a head means disposed on each unthreaded portion of the screw means and means retaining the head means thereon but permitting rotation of the screw means therein for individually advancing or retracting said head means radially, d. said head means each having opposed laterally extending slots defining parallel opposed rows of slots, e. a pair of thin deformable continuous metal cam strips each having a corresponding edge spaced from and disposed in parallel with the other and with said edges being engaged in said respective rows of slots so that a cam profile is defined by the other edges of the strips which project from the slots, the said other edges having opposed cam surfaces, f. a cam folloWer on which are mounted opposed pairs of rollers which have parallel axes of rotation, the peripheries of the rollers in a pair being spaced apart a distance that is substantially equal to the thickness of the cam strip, said roller peripheries in a pair being in contact simultaneously with said opposed cam surfaces for positively driving said follower linearly in correspondence with the cam profile increment that is presented between the rollers by rotation of the said rotatable element.