US403255A - Rocking or shaking grate-bar - Google Patents

Description

' UNITED STATES PATENT OFFICE.

CHARLES J. DORRANCE, OF CHICAGO, ILLINOIS.

ROCKING OR SIHVAKING GRATE-BAR.

SPECIFICATION forming part of Letters Patent No. 403,255, dated May 14, 1889.

Application filed all} z, 1885. Serial No. 170,444. (No model.)

To all whom it may concern: 1

Be it known that 1, CHARLES J. DoREANcE, of Chicago, Oook county, Illinois, have invented certain new and useful Improvements in Rocking or Shaking Grate-Bars, of whichthe following is a full, clear, and exact description, reference being had to the accompanying drawings, which form a part of the same.

The object of my invention, which relates to that class of grate-bars known as rocking or shaking grate-bars, is to simplify and oheapen the construction of such grate-bars, and at the same time to produce a rocking or shaking grate which will, when operated, more thoroughly agitate the fire, separate and loosen the coal, ashes, and clinkers, break up the clinkers, sift out the ashes, and produce a more thorough and complete combustion of the coal. These and other features of my invention will be more readily understood by reference to the accompanying drawings, in which- Figure 1 illustrates in perspective a grate embodying my invention as applied to a boiler-furnace. Fig. 2 illustrates a side view of the grate-bars, the supporting-frame and boiler-front being shown in section. Fig. 3 is a similar view showing a changed position of the bars or grate sections. Fig. 4 is a rear end view showing the rocking-shaft and connections for operating the grate-bars.

In a rocking grate embodying my invention the grate bars or sections are each pivoted or journaled in a frame, so that they may be oscillated or rocked, and the fire-supporting surface of the grate is composed of a number of clips or vertical plates arranged parallel with each other upon each grate-bar.

A main feature of my invention is embraced in a construction in which the pivots 'or journals of each grate-bar are located at one side of a vertical plane passing through the center of the grate-bar, (when the latter is in its natural or normal position,) so that when all of the bars are rocked a positive upand-down motion is given to the plates or clips as the latter are oscillated, while at the.

same time a shearing action is produced between adjacent bars, which tends to break up the clinkers resting upon them.

In the practice of my invention I use one tered B B or more grate bars or sections, according to the amount of fire-surface required. When more than two grate-bars are used, I connect together depending arms upon each alternate,

thereof, and BB the grate-bars, which latter are usually placed transversely of the frame in the manner shown. Each bar has a depending arm, the alternate arms being let- At each end of each bar, either to the right or left of a line drawn vertically through the center of the bar, is located a pivot or trunnion, b, the pivots or trunnions at both ends of the bar being located in the same horizontal plane. The frame A affords bearings for said pivots or trunnions b. C C are rods'or bars which connect the alternate depending arms 13 B of the grate-bars.

D is the rocker-shaft, provided with arms or lugs'D'. 0 0 are rods connecting the bars 0 O with the lugs D on the rocker-shaft, one of said rods being connected above and the other below the rockershaft, as clearly seen in Figs. 2, 3, and 4:.

Supported in a suitable bearing on the front plate, A, is an operating-lever, E. Said lever is provided at its upper end with a handle, and to its lower end is secured one end of a connecting-rod, E, the opposite end of which connecting-rod is secured to one of the rods 0 C. The clips or parallel plates composing the fire-supporting surface are desirably made with convex or rounded upper surfaces and concave sides or under surfaces. I usually cast or place a projection or rib, a, at the ends of the frame opposite the end grate-bars of the series, so as to aid the end clips in crushing the clinkers.

It will be observed that in the operation of my invention, when the operating-lever is moved in one direction, one series of bars, B, will be lowered, while at the same time the series consisting of the alternate bars, B, will be raised, so that the bars will take the position illustrated in Fig. When the operating lever is moved in the opposite direction, the grate-bars will assume a position the reverse of that shown in said Fig. 3. It will also be observed that in moving the lever E a positive upand-down motion, as well as an oscillating and shearing motion, is produced, such movement tending to shake up the fire, sift out the ashes, and break or crush the clinkers. The motion of the grate-bars in the manner described also serves to open and close the spaces between the grate-bars or sections, thereby enabling the ashes and clinkers to pass between the bars into the ash-pit.

I prefer to arrange all the trunnions or pivots on the same horizontal plane in the manner illustrated. In the drawings I have shown one end of the connecting-rod E as attached to the rod 0; but it is obvious that said connecting-rod may be attached to any one of the depending arms 13* B or to one of the arms upon the rocker-shaft, if desired. For convenience I have shown the lever E as attached at about the center of the boilerfront; but said lever may be otherwise located or disposed, as found convenient or desirable.

Having described my invention, what I claim, and desire to secure by Letters Patent, is-

In a grate, a series of bars, B B, provided with pivots or trunnions located on one side of a line drawn vertically through the center of the grate-surface of said bars, said bars being provided with depending arms B 13 two bars, 0 0', one of which bars is connected with the arms B of the alternate bars B, and the other with the arms 13 of the interme diate bars, B, a rock-shaft provided with opposite lugs severally connected with the said bars 0 C, whereby the alternate grate-bars will be oppositely moved when the rock-shaft is oscillated, and means for actuating the rock-shaft, substantially as described.

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

CHARLES J. DORRANCE.

Witnesses:

JoHN W. NORTON, W. A. GLovER.

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