Overfeed stoker
AssigneePeter C. McGee
InventorsPeter C. McGee, Herman O. Beck
Life of this patent
Estimating the term…
Abstract
A fuel stoker for removable attachment to the access port of a solid fuel furnace has a bin for receiving fuel such as coal and a chamber carrying a piston, located at the bottom of the bin, for periodically throwing a charge of coal on top of a fire. A spring-loaded bar, pivotable by one end on the bin, is connected to the piston via a linkage, and spring-biased to advance the piston towards the fire. A spiral cam having a sudden drop-off is intermittently rotated one revolution by a motor to retract the piston and allow fuel to drop into the chamber. At the drop-off, the piston is suddenly advanced to throw the fuel onto the fire. The drive shaft also operates an agitating poker and a grate shaker during the fuel loading phase of operation.
Claims18
A fuel stoker for use with a furnace having a fuel support disposed behind an access port, the stoker comprising:
- a fuel throwing device including an intermittently operated rotatable drive shaft, the fuel throwing device being operable to impel a charge of fuel through a discharge opening of the stoker and adapted to impel the fuel onto the fuel support, the drive shaft being mountable above the fuel support;
- at least one agitator bar for breaking up coked chunks on the fuel support, removing ash from fuel in the furnace and ensuring complete burning, the agitator bar having a first end adapted to be extended into the furnace such that the first end of the agitator bar is movable over the fuel support when the agitator bar is advanced;
- and,
- a linkage eccentrically affixing an opposite end of the agitator bar to the drive shaft, the agitator bar being mountable such that the first end of the agitator bar is movable over the fuel support during the intermittent cycle of the drive shaft.
A fuel stoker for use with a furnace having an access port and a fuel support behind the access port, the stoker comprising:
- a bin for receiving solid fuel;
- a chamber disposed below the bin, the chamber having an opening into the bin and a discharge opening to be directed toward the access port, the chamber being adapted to extend just to the access port;
- a spring-mounted piston disposed in the chamber and movable over as range between an advanced position blocking said opening of the chamber into the bin and a retracted position substantially clear of said opening of the chamber into the bin, the piston being spring biased toward the advanced position;
- and
- a drive means operable on an intermittent cycle for the piston, having a rotatable cam and a motor turning the cam, the piston being connected to a follower urged against the cam, the cam having a surface defining travel of the piston in said range, the cam operative to retract the piston, whereupon fuel enters the chamber from the bin due to gravity, and the cam having a discontinuous portion causing sudden release of the follower, whereupon fuel in the chamber is suddenly thrown through the discharge opening by spring biased force of the piston.
A fuel stoker, comprising:
- a bin having sides converging to a bottom and an outlet passage located at the bottom, the passage having an opening directed outwardly from the bin;
- a piston movably disposed in the outlet passage, advance of the piston to the opening of the outlet passage causing fuel from the bin to be pushed through the outlet passage and to fall away;
- a support including a linkage for driving the piston and a spring connecting the support to the bin, the support being pivotally affixed to the piston and pivotally affixed to the bin, the support being resiliently urged toward the bin by the spring, the support being connected to a cam follower;
- a drive shaft and attached cam mounted on the bin and extending under said support, the cam operative to move the cam follower and the cam defining a path over which the piston is retracted in the outlet passage, the cam having a portion defining smoothly increasing displacement around the shaft over which the cam follower retracts the piston and a stepwise drop off at which the cam follower is suddenly released;
- and,
- a motor for rotating the drive shaft and cam.
Dependencies are inferred from the claim text.