Combustion – Timer – programmer – retarder or condition responsive control – By condition of burner feed or feed means
Patent
1989-07-26
1991-12-31
Price, Carl D.
Combustion
Timer, programmer, retarder or condition responsive control
By condition of burner feed or feed means
431 12, 251254, 251263, 251291, 251292, 74568R, F23N 102, F16K 31524
Patent
active
050767828
ABSTRACT:
A control device, which is interposed between a modulating motor and a valve, includes a control arm which is mounted on the shaft of the valve and a roller follower that is on the arm. In addition, the control device includes a bracket which is mounted on a fuel line adjacent to the valve, a cam which rotates on the bracket about an axis that is parallel to the shaft and an operating arm which rotates with the cam and is connected to the modulating motor, so that the modulating motor moves an air damper and cam in unison. The cam has an arcuate element which curves eccentrically about the axis of rotation and screws which are threaded into the arcuate element such that their ends form a cam profile. The roller follower bears against this profile, riding over the ends of the screws as the cam rotates. The screws on the cam are arranged in two rows, with the screws of one row being staggered with respect to those in the other, and this imparts a continuity to the profile, so that the roller does not pulsate as it moves along the profile.
REFERENCES:
patent: 3433091 (1969-03-01), Jullian-Davin
patent: 4150939 (1979-04-01), Hayes
patent: 4439138 (1984-03-01), Graig et al.
patent: 4629157 (1986-12-01), Tsuchiya et al.
patent: 4635898 (1987-01-01), Rollins et al.
patent: 4790514 (1988-12-01), Marks
Cleaver-Brooks Model CB, Operation, Service And Parts Manual, 1975, pp. 1-3, 5-1, 5-2, 54-3, 5-13, 5-14 and 5-15.
Gordon-Piatt, Instruction Manual, p. 7305.
Briem James J.
Campbell Johnny E.
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