US635400A - Grate. - Google Patents

Description

Patented Oct. 24, I899.

B. J. SGHW-AB.

GBATE.

(Application filed Feb. 20, 1891.)

(No Model.)

a j a gizerab MM fll'iavnga.

UNITED STATES PATENT OFFICE.

RUDOLPH J. SCl-IWAB, OF MILWAUKEE, WISCONSIN.

GRATE.

SPECIFICATION forming part of Letters Patent No. 635,400, dated October 24, 1899.

Application filed February 20,1891. Serial No. 382,233- N mod l- To all whom it may concern:

Be it known that I, RUDOLPH J. SOHWAB, of Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvements in Grates and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

The main objects of my invention are to improve the construction and facilitate the operation of rocking grates to prevent clogging of the same and to facilitate the removal of the grate-bars for the purpose of repairs.

It consists of certain peculiarities of construction and arrangement hereinafter particularly described, and pointed out in the claim.

Figure 1 is a plan view of a grate embodying my improvements. Fig. 2 is a crosssection, on an enlarged scale, of the grate-bars. Fig. 3 is a front elevation of the grate, showing the connection between the grate-bars. Fig. 4 is a perspective view, on an enlarged scale, of a detachable extension of the middle grate-bar; and Fig. 5 is a cross-section of the same.

A represents the ash-pit or base of the furnace, which is provided with suitable bearings for the grate-bars.

B B represent the grate-bars, cast or otherwise suitably provided with lateral projections 6 I), having curved faces which are concentric with the axes of said grate-bars and form obtuse angles with the flattened tops thereof, as shown in Fig. 2. The projections b b on one side of the bars are made longer than the projections b b on the opposite side, with which they alternate to afiord a wider opening when the grate-bars are turned to the left, as shown by dotted lines in Fig. 2, for releasing and dropping clinkers or dumping the contents of the fire-pot. Within the limits of the rocking movement ordinarily given to the grate-bars in shaking a grate the same width of opening is maintained between the curved faces of the projections b b on' the adjacent grate-bars, and clinkers, lumps of coal, or other hard substances too large to fall between the grate-bars ride upon the curved faces of said projections without impeding their movement and are crushed or gradually pulverized by the abrading action of said curved faces and of the obtuse angles formed by their intersection with the flattened tops of the grate-bars. The sticking or clogging of the grate is thus prevented.

The front ends of the grate-bars are supported by a removable plate 0, bolted to the under side of the top plate of the ash-pit, and are formed'with crank-arms b 17 which are connected on both sides by bars or links d d, as shown in Figs. 1 and 3.

The middle grate-bar (or, if there is an even number, one of the middle bars) is formed with a tongued tenon at its front end to fit a similar socket in the removable extension E,which projects through a perforation in the doorplate F of the furnace, and is squared at its outer end to receive the shaking crank or handle, as shown in Figs. 1, 4, and 5.

' The extension E is fastened in place on the end of the grate-bar shaft by a pin 6, as shown in Fig. 5. By means of this construction the grate-bars can be readily removed from the ash-pit for repairs without disturbing the door-plate F of the furnace by simply removing the extension E and detaching the plate 0, which supports the front ends of the gratebars. The joint by which the extension E is attached to the middle grate-bar may be cast as shown in the drawings and requires no machine-work or hand fitting. It not only affords an efficient construction for the purpose, but is also simple and cheap.

The inwardly-proj ecting flange a at the top of the ash-pit surrounding the grate is formed at the sides with projections a 0. similar to andalternating with the projections on the adjacent grate-bars.

To permit of a greater throw of the shaking crank or handle to the left for the purpose of dumping the contents of the fire-pot, I set the crank-arms b b at an inclination from a perpendicular when the grate-bars are in their middle position, as shown in Figs. 1 and 3.

In the ordinary operation of shaking to remove ashes and clinkers from the fire-pot the grate-bars are rocked back and forth a limited distance, the same width of space being preserved during the operation between the curved faces of the projections to, Z), and l) on the frame of the grate and adjacent gratebars.

The movement of the grate-bars in the foregoing operation is approximately from the position in which they are shown in Fig. 2 to the right. To produce a Wider opening for the purpose of dropping clinkers which cannot be readily crushed or pulverized in the manner previously described and to dump the entire contents of the fire-pot, the grate-bars are turned to the left, as indicated by dotted lines in Fig. 2.

Various changes may be made in the details of construction and arrangement of the grate within the scope of my invention.

I claim The combination in afurnace-grate of rocking grate-bars provided with lateral projections having curved upper surfaces concentric with the axes of said bars; the projections on one side of said bars being longer than on the other, and provided also with crank-arms which are set at an inclination to a perpendicular when the grate-bars are in their middle or normal position, and a link pivoted to and connecting said crank-arms,substantially as and for the purposes set forth.

In testimony that I claim the foregoing as my own I affix my signature in presence of two witnesses.

RUDOLPH J. SCIIXVAB. Witnesses:

A. A. L. SMITH, E. O. AsMUs.

Images