US2083284A - Grate bar - Google Patents

Description

C. A. WARG GRATE BAR June 8;. 1937.

Original Filed March 15, 1923 Wm WW uu Pp INVENTORIIV? a e 6Z7 AfTORNEY Patented June 8, 1937 UNITED STATES PATENT OFFICE GRATE BAR Charles A. Warg, Scranton, Pa., assignor to Me- Clave-Brooks Company, Scranton, Pa., a corporation of Pennsylvania Original application March 13, 1928, Serial No.

261,361. Divided and this application November 5, 1934, Serial No. 751,618

3 Claims. (01. 126-180) The present invention relates to furnace grates and has for its principal object the provision of a simple and efficient dumping grate suitable for high or low pressure heating installations.

The invention provides certain improvements in a grate of this type which lower the cost of production, improve operating efiiciency, and facilitate the replacement of worn and broken parts. The invention also provides an improved mounting of the tops on the grate bars, this improvement eliminating the necessity of cored bars, which are comparatively expensive to manufacture. Other improvements effected by the invention are recited more fully in the claims.

In the drawing:-

Figure 1 is a plan view of the front part of the grate, showing one row of the grate bar tops in horizontal section.

Figure 2 is a side elevation of one of the grate bars.

Figure 3 is a transverse sectional view of a pair of grate bar tops.

Figure 4 is a vertical longitudinal section thru a grate showing a top in place.

The carrier bars 20, which are of truss form, carry the journal bearings of the several grate bars, and are supported on the usual front and rear plates, not shown, and are connected at the front by the frame end 25 which is interlocked with the carrier bars by the engagement of dove-tail tenons 26 at the ends of the front frame end or bar in correspondingly shaped slots in the carrier bars.

The grate has from two to ten grate bars 28, each supporting a number of independently removable tops 29, the top at one side being shown as of fractional width. Each grate bar 28 is a rectangular hollow casting of the construction clearly shown in Figures 1 and 2. The bar is open at the top and bottom and closed at the ends, and is divided into four sections by partition walls 46, each section being adapted to seat one of the four tops. The bar is provided with opposed ribs 40a, which project inwardly from the sides of the bar in pairs at points midway between the partitions 40 to position the central web of the top. Formed integrally with each grate bar is the usual depending lug 4| having a laterally projecting pin 42 for attachment to the connecting bar 43. The bar 43 is attached to a connecting rod such as 45, which extends thru apertures in the metal front of the furnace for convenient manipulation in usual manner, and as fully illustrated in my copending application, Serial No. 261,361, filed March 13, 1928, of which this case is a division, now Patent No. 2,003,729 dated June 4, 1935.

The grate bar tops 29 are best illustrated in Figures 1 and 3. Each top is of familiar elongated rectangular form having beveled ends which are adapted to overlap and be overlapped respectively by the ends of adjacent tops, and the sides of the tops may be rabbeted in the smaller mesh sizes, as shown in Figure 3, so that adjacent tops on the same bar overlap, this construction preventing sifting between the sides of the tops as well as between the ends of the tops. Each top is formed with a central downwardly projecting web 50, so that the shank has in horizontal section the form of an I-beam, as clearly shown in Figure 1. This side flanged shank pro-- jects down thru the space in the hollow grate bar defined by adjacent partitions 40, or between the end walls of the bar and the partition adjacent thereto, the central web 50 of the depending socket piece or shank entering between opposite ribs 40a. The tops are held in position by means of split pins 5| which are driven thru slots 52 in ears or tabs 53 extending from the bottom edge of web 50, these pins bridging the lower edges of the side walls of the grate bar and thus securely holding the tops on the bar. It will be observed that this method of mounting the tops on the bars does not require any coring of the bars nor any appreciable machine work on the bars or tops, the construction of these parts being therefore rendered simple and economical while at the same time the construction is as durable and as eflicient as the more expensive constructions heretofore employed.

What I claim is:

1. A grate bar consisting of a rectangular casting open at the top and bottom and having transverse walls forming a number of compartments and a pair of opposite ribs projecting inwardly from the side walls of each compartment, a grate top for each compartment having a depending portion which has the form of an I-beam in horizontal cross section, ribs for preventing the flanges of said depending portion from abutting the end walls of the compartment and the web passing between said ribs, and a split pin passing through said'web and engaging the bottom edges of the bar.

2. A grate bar consisting of a pair of elongated vertical side walls held in spaced parallel relation by a plurality of integral transverse walls, said walls forming a series of open 0pposed vertical cells or sockets, a pair of vertical ribs in each cell projecting inwardly from the central portion of opposite side walls, a grate top for each cell having a depending portion which has the form of an I-beam in horizontal cross section and having its web located between the ends of said ribs, the flanges of said depending portion being spaced from said ribs for providing air cells, and. a split pin passing thru said web and engaging the bottom edges of the side walls and of said ribs, thereby leaving the air cells open at the bottom.

3. A grate bar top having a depending portion in the form of a vertical I-beam having a web and flanges, characterized by the provision of a vertical rib disposed on each outside Surface formed by the two flanges at each end of the web, whereby said grate bar is easily removed from engagement with its supporting structure.

CHARLES A. WARG.

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