US1030142A

US1030142A - Smoke-consuming and fuel-economizing apparatus for furnaces and the like.

Info

Publication number: US1030142A
Application number: US63233011A
Authority: US
Inventors: John Thomas
Original assignee: Individual
Current assignee: Individual
Priority date: 1911-06-10
Filing date: 1911-06-10
Publication date: 1912-06-18
Anticipated expiration: 1929-06-18

Description

J. THOMAS.

.SMOKE GONSUMING AN D FUEL EGONOMIZING APPARATUS FOR FURNACES AND THE LIKE.

APPLIOATION FILED JUNE 10, 1911.

Patented June 18, 1912.

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J. THOMAS. SMOKE GONSUMING AND FUEL EGONOMIZING APPARATUS FOR FURNACES AND THE LIKE.

APPLICATION FILED JUNE 10, 1911.

Patented June 18,1912.

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JOHN THOMAS, OF KENILWORTH, ENGLAND.

Specification of Letters Patent.

Patented June 18, 1912.

Application filed June 10, 1911. Serial No. 632,330.

To all whom it may concern:

Be it known that I, JOHN THOMAS, a subject of the King of Great Britain and Ireland, and a resident of Kenilworth, VVarwickshire, England, have invented certain new and useful Improvements in Smoke- Consuming and Fuel-Economizing Apparatus for Furnaces and the Like; and I do hereby declare the following to be a full, clear, and exact description of the same.

This invention relates to improvements in smoke consuming and preventing and fuel economizing apparatus forfurnaces and the like, wherein a grid on the fire door, automatically opened at the time of stoking, is automatically and gradually closed by a device against the resistance of liquid forced by a piston through a regulable passage, so that air is allowed to enter above the fire bars to burn the smoke formed immediately after sto-king, and such air supply is cut off when the coal no longer tends to choke the ordinary air supply through the grate.

In the accompanying drawings :-Figure l is a front elevation of an apparatus constructed according to the present invention; Fig. 2 is a plan thereof; Fig. 3 is a sectional plan on 8-3, Fig. 1; Fig. 4 is a sectional elevation on 4c-4, Fig. -1; Fig. 5 is a sectional elevation on 55, Fig. 1, on an enlarged scale; Fig. 6 is a part sectional elevation on 66, Fig. 5; Fig. 7 is a sectional plan on 77, Fig. 5; Fig. 8 is a transverse section of a furnace through the back bridge plate, looking backward; and Fig. 9 is a longitudinal sect-ion on 9-9, Fig. 8. Fig. 10 is a part longitudinal sectional elevation;

According to the present invention a grid, at, is adapted to slide vertically on a gridlike fire door, I), and a cup leather piston, 0, working within and engaging the walls of a preferably vertically arranged cylinder, cl, is adapted to control the closing of the grid, at. The grid, at, is mounted between vertical guide, 6 on the fire door.

6 represents stops on the fire door engaging slots, a in the-grid, a, for support ing the latter in its lowest position.

The fire door, byis hinged to the furnace front, 6, as at 6 The cylinder is mounted on the furnace front by bolts or the like, f. The piston, 0, is normally urged to one end, in the case illustrated, the top, of its stroke, by a spring, preferably a coiled spring, 9,

mounted within the cylinder, or surroundlng the piston rod, 0

The fire door 1s provided with a cam, 5

or equivalent means, made fast to the door so as to turn therewith and adapted as the door is opened to act on one end, M, of a lever, it, or lever system, the other end, W, of which engages or rests upon the piston rod. The ends of the lever are preferably provided with anti-friction rollers, z, i, as shown.

The construction and arrangement is such that as the fire door is opened the piston is forced against the spring to one end, in the case illustrated the bottom, of its stroke, and that when the fire door is closed and the lever, h, is free to resume its original position, the spring tends to return the piston to the top of its stroke.

The grid, a, is connected to the piston rod by a flexible cable, j, or the like, attached to the grid, preferably in an adjustable manner, as at j and guided over or around pulleys, is, k 72 or the like, respectively arranged vertically above or in line with the grid, the fire door hinge, and the axis of the piston rod or approximately so. The pulley, is, is mounted on the fire door and the pulleys, 70 76 on the furnace front or other connection, 7', and that when the fire door is closed and the piston'is raised by the spring, the grid is allowed to close by its own weight, the spring merely serving to force the piston upward. The piston is mounted on the piston rod, so that liquid with which the cylinder is charged is free to pass around the piston from the lower end of the cylinder to the upper end when the piston is moved downward by the lever, it, against the spring thereby dispensing with the use of clack valves on the piston, but, the piston resists movement of itself by the spring.

The piston rod, 0 which may form the piston block or pass therethrough, is made hollow, as at 0 and provided with a needle or similar valve, n. The stem, m of the valve is adapted to be adjusted in position by aneccentric, 0, on the piston rod, acting between stops or within a strap, m on the valve stem. The piston rod passes through a stufling box, 6Z and the top end of the cylinder has an inwardly extending boss or flange, (Z adapted to serve as a stop for the piston and prevent damage thereto.

(Z is a filling aperture which is normally closed by a plug.

The valve stem at its upper end passes through a stufling box, 0 and the eccentric is supported in bearings, 0 a, in an extension, 0, screwed onto the piston rod.

0 is a plug held in the extension, 0 and carrying a loop, 0", to which the cable, 7', is attached.

The construction and arrangement is such that by adjusting the position of the eccentric by a hand wheel, 0 marked with a scale in conjunction with an index on the piston rod, or by a lever or pointer working over a scale on the piston rod, the amount of opening of the valve may be readily and accurately controlled. The valve is adapted to close against a seat, a provided at the lower end of the passage, 0 which opens into the lower and upper ends of the cylinder, as shown.

The valve serves to allow the liquid to pass in a greater or less time from the upper end of the cylinder to the lower end through the passage, 0 when the fire door is closed and the spring tends to raise the piston, and thereby regulates the closing of the grid by its own weight as aforesaid.

A draft door, 9, is provided at the back end of the fire pit to admit a secondary air supply at the back of the fire bridge, 9. The door, 39, is pivotally mounted, as at 29 in brackets, r, on a transverse plate, 0", which supports the back bridge plate, q, and when shut is adapted tolie in an inclined position against side plates or shrouds, 1' m'dc Fig. 9. The door, 72, is actuated by a counterweighted cam, s, eccentric, or the like, mounted on a rotary spindle, 5 supported in bearings, 8 on one of the side plates, 7. The cam is operated by an arm or, a lever, 8 connected, ats, to a flexible cable, 2?, or a rod and cable or the like. The cable, t, passes around suitably arranged pulleys, t t and is connected with the piston rod.

The construction and arrangement is such that as the fire door is opened, the draft door is opened, and as the grid is closed the draft door is closed, the draft door commencing to close at the same time as the grid commences to close. The cam or the like is made of such a throw that it opens the draft door quicker during the latter part of the stroke than during the earlier part, and allows the door to close quicker during the earlier part of the stroke than during the latter part to obtain a better combustion of the smoke. The inclined position of the draft door when shut insures its proper closure.

The apparatus is of advantage, inter alia, in that the cup leather piston is more certain in its action and offers less resistance to the opening of the fire door than pistons fitted with clack valves as hitherto constructed.

A baffle plate or wall, w, is preferably built or arranged opposite and behind the draft door to deflect the air toward the gases escaping over the fire bridge, in known manner. A hood, a2, is preferably mounted at the back of the fire door for deflecting the air entering through the grid downward onto the dead plate or fore end of the grate, in known manner.

WVhat I claim as my invention and desire to secure by Letters Patent is 1. In smoke consuming and fuel economizing apparatus for furnaces and the like, in combination, a grid-like fire door, a grid adapted to slide vertically on the fire door and tending to close by its own weight, a cylinder adapted to be charged with liquid, a cup leather piston mounted within the cylinder and adapted to be moved freely in one direction, a hollow piston rod the interior of which is adapted to communicate with both ends of the cylinder, an adjustable needle or similar valve in the piston rod for cont-rolling the passage through the piston rod, a spring tending to move the piston to one end of its stroke, a lever engaging the piston rod, a cam on the fire door adapted to act on the lever so that as the fire door is opened the piston is forced to one end of its stroke against the action of the spring, and so that when the fire door is closed the spring tends to return the piston to the other end of its stroke, pulleys respectively arranged vertically above or in line with the grid, the fire door hinge, and the axis of the piston rod or approximately so. the first of such pulleys being mounted on the tire door and flexible means connecting the grid to the piston and guided over said pulleys, so that as the fire door is opened the grid is opened by the piston pulling on the flexible connection, and when the fire door is closed and the piston is movedby the spring, the grid is allowed to close, substantially as described.

2. In smoke consuming and fuel economizing apparatus for furnaces and the like, in combination, a grid-likefire door, a grid adapted to slide vertically on the fire door and tending to close by its own weight, a cylinder adapted to be charged with liquid, a cup leather piston mounted within and engaging the walls of the cylinder and adapted to be moved freely in one direction, a hollow piston rod the interior of which is adapted to communicate with both ends of the cylinder, an adjustable needle or similar valve in the piston rod for controlling the passage through the piston rod, a spring tending to move the piston to one end of its stroke, a lever engaging the piston rod, a cam on the fire door adapted to act on the lever so that as the fire door is opened the piston is forced to one end of its stroke against the action of the spring, and so that when the fire door is closed the spring tends to return the piston to the other end of its stroke, pulleys respectively arranged vertically above or in line with the grid, the fire door hinge, and the axis of the piston rod, or approximately so, the first of such pulleys being mounted on the fire door, and flexible means connecting the grid to the piston and guided over said pulleys, so that as the fire door is opened the grid is opened by the piston pulling on the flexible connec tion, and when-the fire door is closed and the piston is moved by the spring, the grid is allowed to close, substantially as described. v

3. In smoke consuming and fuel economizing apparatus for furnaces and the like, in combination, a grid-like fire door, a grid adapted to slide vertically on the fire door and tending to close by its own weight, a cylinder adapted to be charged with liquid, a cup leather piston mounted within and engaging the walls of the cylinder and adapted to be moved freely in one direction, a hollow piston rod the interior of which is adapted to communicate with both ends of the cylinder, an adjustable needle or similar valve in the piston rod for controlling the passage through the piston rod, a spring tending to move the piston to one end of its stroke, means for moving the piston against the spring as the fire door is opened, means connecting the piston to the grid, a draft door at the back of the fire pit adapted to be operated OK the piston rod to admit a secondary air supply at the back of the fire bridge and adapted to commence and finish closing at the same times as the grid does and when shut to lie in an inclined position, a spindle, and a cam, on the spindle and adapted to be operated off the pistonrod, said cam having its working face extending in a curve outwardly from adjacent to said spindle so as to have a variable throw whereby the draft door opens quicker during the latter part of its stroke than during the earlier part and to allow the draft door to close quicker during the earlier part of its stroke than during the latter part, substantially as described.

4. In smoke consuming and fuel economizing apparatus for furnaces and the like, in combination, a grid-like fire door, a grid adapted to slide on the fire door, a cylinder adapted to be charged with liquid, a piston mounted within the cylinder and adapted to be moved freely in one direction, a passage connecting the ends of the cylinder, means for controlling the passage, a spring tend ing to move the piston to one end of its stroke, a lever engaging the piston rod, a cam on the fire door adapted to act on the lever so that as the fire door is opened the piston is forced to one end of its stroke against the action of the spring, and so that when the fire door is closed the spring tends to return the piston to the other end of its stroke, pulleys respectively arranged vertically above or in line with the grid, the fire door hinge, and the axis of the piston rod, or approximately so, the first of such pulleys being mounted on the fire door, and flexible means connecting the grid to the piston and guided over said pulleys, so that as the fire door is opened the grid is opened by the piston pulling on the flexible connection, and when the fire door is closed and the piston is moved by the spring, the grid is allowed to close, substantially as described.

In testimony whereof I affix my signature in presence of two subscribing witnesses.

JOHN THOMAS.

Witnesses:

ALFRED DAY, WALTER DAY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C.