US1484901A - Grate bar - Google Patents

Description

c. P. OAKMAN GRATE BAR Filed Nov. 1919 Feb 26 1924.

Patented Feb. 26, W24.

GTE BAR.

Application filed November 28, 1919. serial Ho. 840,9.

To all whom it may concern:

Be it known that I, CHARLES P. OAKMAN,

a citizen .of the United States, residing at Cambridge in the county of Middlesex and a State of .assachusetts, have invented certain Improvements in Grate Bars, of which the following description, in connection with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the several: figures.

This invention relates to grate bars of the type used in automatic stokers. A common commercial type of automatic stoker comprises a series of segments or sections jointed together to form an endless grate which is driven at aslow but substantially uniform rate of speed. The sections or segments of this grate each consists essentially of a bar that extends transversel of the grate and supports a series of grate ars or grate elements, the ends of the supporting bar being carried by suitable links. Usually the support consists of a dove-tail bar and the grate bars themselves are each notched or grooved to slide longitudinally on this bar, the "entire series of bars makin up an individual segment or section and being held in place by master bars at the ends of each section. A well known example of this construction is the Coxe stoker.

Whenever one of these grate bars becomes broken, it is necessary to stop the movement of the grate, remove the master bar, and slide old the bars up to the broken member. The broken bar can then be removed and a new one substituted for it, after which the bars that have been-removed are replaced in their original positions It is obvious it is especially objectionable because it reat accompanying drawings, and the novel feathat this operation consumes much time and tures will be articularly pointed out in the a pended c aims.

Re erring now to the dra Figure 1 is an angular view of a part of a grate bar support on which are mounted two grate bars constructed in accordance wlth this invention; and

Fig. IS a fragmentary vertical cross sect1ona1 v1ew through one of the grate bars shown in Fig. l and its support.

The grate bar support 2 shown in the drawlngs is of the usual construction and consists of a relatively flat bar of a dovetail shape in cross section. The regular grate bars are placed on this bar 2 b sliding them longitudinally of the latter ar until substantially the entire length of the bar is filled up, after which the master bars are secured in place, thus retaining all the bars in their operative positions. Each bar of the usual t e consists of a single piece of metal and as the eneral shape of the bars B-B shown in i ig. l. The bar provided by this invention consists of two parts or sections designated as 3 and 4.-, respectively. The lower parts of these sections are notched, as indicated at 5 and 6, respectively, to fit overthe opposite edges of the support 2, and the section 3 has an upper extension 7 that overla s a similar extension 8 on the section 4. oles are drilled through these overlapping parts to receive fastenings 9 and 10 that serve tosecure the two sections together in their operative positions.

' without disturbing the adjacent grate bars by knocking it out of the ate when it comes around to the forward part of the grate, next placing the sections 4 and 3 on the bar 2 inthe positions in which the are shown in Figs. 1 and 2, and finally drlving two pins or nails 9 and 10 through theoverlappmg parts of these sections, thus securing them together and causing them to grip the dove-tail bar 2.

This entire relpairing operation can be performed while t e grate is travellin The objection to which prior constructions of this character were open thus is entirely avoided. Attention is particularly called to the fact that this advantage is secured by making the grate bar in sections which can be placed in their operative positions on the support 2 by moving them transversely of the bar into the slot formerly occupied b the broken bar. The peculiar shape of tlie meeting ends of the sections and the fact that the sections can be secured together simply by driving pins nails, or slmilar fastenings through the holes in the overlapping sections, also contribute to this result.

What is claimed as new is:

1. A gratebar for repair purposes comprising two sections notched to engage the opposite edges of a dove-tail grate bar support and having parts that overlap when so mounted on said support, and means for securing said sections together.

2. A grate bar for repair purposes comprising two sections notched to engage the opposite. edges of a dove-tail grate bar support and having parts that overlap when so mounted on said support, and pins ex-\ tending through said overlapping parts and consisting of two sections, said sections being notched to engage respectively the opposite edges of said dove-tail bar, said sections having grate surfaces and having parts that overlap each other when so mounted on said supporting bar, and means'for securing said overlapping parts together. In testimony whereof I have signed my name to this specification.

CHARLES r. OAKMAN.

of a transbar mounted on said supporting bar and

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