US1337214A - Fire-grate - Google Patents

Description

1.1. FOWDEN.

FIRE GRATE. APPLICATION- FILED JUNE H, 1919.

Patented Apr. 20, 1920.

2 SHEETSSHEET 1.

- 1477'0/F/VEK J. J. FOWDEN. 1

FIRE GRATE.

I APPLICATION FILED JUNE 11, 1919. 1,337,214. Patented p 20, 1920.

2 SHEETS-SHEET 2.

l/VVENTOR L/ose o/L 4/, 5010049 7? W m W ATTORNE JOSEPH J. FOWDEN, OF PHILADELPI-IIA, PENNSYLVANIA.

FIRE-GRATIS.

Specification of Letters Patent.

Patented Apr. 20, 19.20.

Application filed June 11, 1919. Serial No. 303,371.

To all whom it may concern:

Be it known that I, Josnrn J. FownnN, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in FireGrates, of which the following is a specification.

The principal objects of the present 1nvention are, first, to provide for successfully undercleaning the fire by filing away the under surface of the ash bed, thus eliminating the necessity of drawing the fire; second, to maintain a uniform draft and fire bed by providing that only sutficient ash be undercut to keep the bed at a predetermined depth; third, to preserve the grate by air cooling and by keeping the fire from coming into contact with the fire bars at all times; fourth, to avoid losses such as are due to the introduction of air into the furnace because ashes may be removed at all times and while the fire is in full and normal action; fifth, to save fuel and prevent carbon losses by keeping an ash bed thlck enough to prevent coal from coming into contact with the grate and by avoiding all disturbance of the fire-bed; and sixth, to provide a grate which shallbe durable and efficient in operation and which will save waste of fuel.

The invention will be claimed at the end hereof but will be first described in connection with the accompanying drawings forming part hereof and in which Figure 1, is a plan view of so much of a grate as is necessary for illustrating the 1nvention in connection with the following description, and showing the bars in normal position.

Fig. 2, is a similar view showing the bars in abnormal or cleaning position.

Fig. 3, is a side view of a grate bar.

Fig. 4, is a sectional view taken on the line H of Fig. 3.

Fig. 5, is a side view of mechanism for reciprocating the bars in groups.

Fig. 6, is an end view partly in section of the same, and

Figs. 7 and 8, are views similar to Figs. 5 and 6, and showing a modification.

A description of one grate bar will suffice for they are alike, but they are arranged in reverse direction. Each grate bar tapers from the top to the bottom and is provided on top with similarly disposed teeth 1, having spaces 2, between. At the spaces the top of the bar slants away sidewise from a ridge or is roof-shaped as at 3. Between the teeth, and generally in line with the roof-shaped portion 3, the sides of the bar are provided with concavities t.

In a grate the bars are arranged sideface to side-face with the teeth of adjacent bars reversely disposed, and in the normal position the concavities 4, adjacent bars are out of alinement so that the holes provided through the grate by the concavities 4:, are sufficiently large to pass all the air needed, but are small enough to prevent the passage of solid matter.

To move alternate bars endwise in groups, use may be made of a rock-shaft 5, having rock-arms 6, between pairs of bars of which the alternate bars are pivoted and of which the intermediate bars are slidable on the rockshaft which constitutes a support. There is a rock shaft at each end of the grate, so that alternate bars are moved endwise and back at intervals and this is true of intermediate bars. The bars may be moved endwise individually or in any de sired groups. To do this the bars are mounted to slide on a support 7, and there is a key 8, traveling on a worm shaft carried by the rocker arms 6, and cooperating with a notch 9, in the rocker arm and in one or more of notches 10, provided in the grate bars. No means are shown for driving the worm shaft but those skilled in the art will understand how to supply them and they may operate from the center of oscillation of the rocking member.

When the bars are moved endwise at appropriate intervals the bottom of the ash bed is, as it were, filed off by the teeth 1, without disturbing the fire-bed and in such a way that sufficient ash is left for protecting the grate bars. The ash so removed falls onto the roof-shaped portions 3, and thence through the openings provided by the alinement of the concavities 4, into the ash pit.

' The downwardly beveled sides of the bars including the walls of the concavities avoids stoppage, and as the bars are returned to normal position the concavities clear themselves of any ash that may tend to lodge in them. In the normal position of the bars the openings formed by concavities and the adjacent side walls of the bars are too small to permit of the passage of such solid particles as are present, but are sufficiently large to admit the necessary air.

I claim:

1. A fire grate consisting of bars arranged close enough together to normally prevent the passage of ash between them and having on top teeth low enough to produce a filing action on the lower ash surface and spaced apart to provide clearance and reversely disposed on adjacent bars and said bars having on their sides between the teeth spaced concavities small enough to exclude the passage of ash when out of alinement, and means for reciprocating the bars endwise, substantially as described.

2. A. fire grate consisting of bars laterally tapering from the top toward the bottom and having on top teeth low enough to produce a filing action reversely disposed on adjacent bars and having between the teeth root' shaped portions and having on their sides between the teeth spaced concavities normally out of alinement on adjacent bars, and means for reciprocating the 2 alternate and intermediate bars endwise in groups.

3. A fire grate consisting of bars laterally tapering :trom the top toward the bottom and having on top teeth low enough 3 to produce a filing action reversely disposed on adjacent bars and having between the teeth roof-shaped portions and having on their sides between the teeth spaced concavities normally out of alinement on adja- 3 cent bars, and means for reciprocating the bars endwise singly.

4:. In a grate the combination of bars ar ranged with their side walls in close enough proximity to prevent the passage of ash and 4 each having in its side walls spaced concavities small enough to individually prevent the passage of ash and normally out of alinement, and means for moving the bars endwise to aline the concavities and permit 4 the passage of ash, substantially as described.

JOSEPH J. FOWDEN.

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