US1357786A - Traveling grate - Google Patents

Description

W. LLOYD.

TRAVELING GRATE.

APPLICATION FILED Ski P133, 191s.

Patented Nov. 2,1920.

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W. LLOYD.

TRAV G GRATE.

APPLICATION 0 SEPT. a, 1918.

1 ,357,7s Patented Nov. 2, '1920."

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I Mum/w LLoKn UNITED STATES PATENT OFFICE.

WILLIAM LLOYD, OF HAZLETON, PENNSYLVANIA, ASSIGNOR TO COXE TRAVELING GRATE COMPANY, OF PORT CARBON, PENNSYLVANIA, -A CORPORATION OF PENN-.

SYLVANIA.

TRAVELING GRATE.

Patented Nov. 2, 1920.

Original application filed January 25, 1918, Seria1 No. 213,784. Divided and this application filed September 3, 1918. Serial No. 252,363.

To all to 710m it may concern:

Be it known that I, IVILLIAM LLOYD, a citizen of the United States of America, residin at Hazleton, in the county of Lu zerne and btate of Pennsylvania, have invented a certain new and useful Improvement in Traveling Grates, of which the following 1s a specification.

My invention relates to traveling grates and particularly to means by which the blast may be sealed at the sides of the grate during the working travel of the latter.

The present application is a division of my copendiug application Serial No. 213,7 84, filed January 25, 1918.

In the accompanying drawings,

Figure 1 is a sectional plan of portion of a traveling grate, some of the grate bars being omitted and others shown without their keys;

Fig. 2 is a section on the line 2-2, Fig. 1, but omitting the furnace walls and more of the grate bars and key banks thereon;

Fig. 3 is a broken section on the line 33, Fig. 2, showing the supplemental seal plate on the left in operative position, and that on the right in inoperative position;

Fig. 4 is a partial plan view of a grate bar with portion of the preceding and followlng bars, and showing seal springs in addition to interlocking rib-seals, but omitting the key banks; and

Fig. 5 is a section on the line 5-5, Fig. 4, but showing the key banks in position.

In a grate of the present type, the point at which there is most apt to be loss of fuel at the margin of the fuel bed, through the escape of the blast at the ends of the grate bars, is the area adjacent the hopper before the fuel. is fully ignited. In order to prevent this loss, I provide the wind chest, particularly the section adjacent the hopper end of the grate, with a secondary seal plate 144 adjacent the usual seal plate 145. This secondary seal plate may extend the length of the wind box, if desired, but I have here shown it only in connection with the chamber 146, as above stated. I have also shown it hinged at 147 and connected through a lever 148 with a control rod 149 passing through the side wall 150 of the. fire box. The seal 144 extends inward to an extent suificient to cotiperate with the sealing ribs 151 formed on the grate bars 152. The

double seal afforded by this supplemental rib 151 and plate 144, combined with the usual rib 153 and fixed sealing plate 145, practically eliminates the escape of air between the joints and underneath the keys outward toward the chain and up the side of furnace wall. Moreover, it permits a more accurate control of the ignition of the fuel bed after it leaves the hopper. The latter effect is incident to the ignition of the fuel bed in part by the heat radiated by the arch of .the fire box when the furnace is in operation. This radiation is greatest from the middle of the arch and grows gradually less toward the side walls thereof. Consequently, the ignition of the fuel nearer the side walls is tardier than its middle portion of the bed. By manipulating the supplemental side seals 144 by swinging them down out of position so as to allow the ignition to proceed as rapidly as possible to the margins of the fire bed, thereby heating the side walls of the fire box, the latter are brought to a condition in which they aid in the ignition of the marginal portions of the fuel bed, whereupon the seal 144 may be swung up into position to cooperate with the ribs 151, therebycutting off the blast from the margins of the fire bed to a large extent so that the tendency of the fuel to blow off at this point is substantially prevented, while nevertheless full ignition is secured. IVith a double seal of this type, it is possible to arrange the outer seal 153 closer to the side wall of the fire box, thereby admitting the air more freely to the margins of the bed during the initial ignition of the fuel bed and subsequently cutting off the flow of air to these margins after the fire box wall has become sufficiently heated and thus prevent the loss of fuel and pressure at this point. It may be necessary to some what bank the sides of the fire bed during the initial ignition period when the seal 144 is down, in order to prevent the blowing out of the fuel at this point by the blast. But this operation would be no longer necessary after the side walls of the fire box have become properly heated and the seals 144 brought into play.

In Figs. 4 and 5 I have shown pairs of spring plates 154155 carried at the sides of the grate bars 152 and engaging the sealing ribs 151-153 of the respective following grate bars to more effectually complete the seals and prevent leakage between the bars at the joints between the cooperating sealing ribs.

Various modifications 'in detail of construction and arrangement will readily ocour to those skilled in the art, which do not depart from what I claim as my invention.

1. In combination with a traveling grate, a wind box subjacent the working portion of the grate, seal plate means at the sides of the wind box and closely spaced sealing ribs at the sides of the grate cooperating with said plate means to afford a double seal at the side margins of the grate, together with means for rendering portion of said sealing plate means ineffective at will.

2. In combination with a traveling grate, a wind box subjacent the working portion of the grate, seal plate means at the sides of the wind box, said seal plate means having greater transverse extent at the feed end of the grate than at the discharge end thereof, together with sealing means on the grate 00- operating with said seal plate means to af-' ford a double seal at the feed end of the grate.

margin of the wind box and a movable seal plate arranged inwardly therefrom and double marginal seal.

means on the grate cooperating with both the fixed and movable seal plates to afford a 4. In combination with a traveling grate, a wind box subjacent the working portion of the grate, a fixed seal plate at the outer margin of the wind box and a movable seal plate arranged inwardly therefrom at the feed end of the grate and means on the grate cooperating with both the fixed and movable seal plates to afford a double mar ginal seal.

In combination with a traveling grate, a wind box subjacent the working portion of the grate, a fixed marginal seal plate, a movable seal plate forming an inward extension of the fixedplate, and manually operated means for rendering said movable seal plate ineffective.

6. In a traveling grate, a pair of grate bars having sealinglribs and a spring plate carried by one bar and engaging the end of the sealing rib of the other bar to render the seal continuous.

7. In a traveling grate, a pair of grate bars having sealing ribs and a pair of spring plates carried by one bar and straddling the end of the sealing rib of the other bar to render the seal continuous.

In testimony whereof I have signed my name to this specification.

WILLIAM LLOYD.

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