US1775790A - Grate bar - Google Patents

Description

p 1930- 7 J. T. TAWLKS 1,775,790

GRATE BAR Filed May 25, 1927 orJ ATTORNEY Patented Sept. 16, 1930 UNITED; STATES PATENT OFFICE JOHN T. TAWLKS, or EVERETL'WASHINGTOUN, nssrenoit T TAw xs GRATE ms P NY, A CORPORATIONOEWASHINGTON I .1 'j- GRA'JJE BAR Application filed May 25,

This invention relates to improvements in grate bars for furnaces and the like, and particularly to demountable, water cooled gratebars; it being the principal object of the invention to provide grate bars comprising disconnectible upper and lower sections that are cooled by a circulation of water through pipes that are disposed between the bar sections but which are entirely separate therefrom so that the sections may be easily and quickly demounted for'repair or replacement. 7

Other objects of the invention reside in the various details of construction and combination of parts as is hereinafter described.

In accomplishing these objects of the invention, I have provided the improved details of construction, the-preferred forms of which are illustrated in the accompanying drawings, wherein 1 a furnace grate formed by water cooled grate bars that are constructed in accordance with this invention; the top section of the forward bar being removed for better illustration.

Figure 2 is aplan view of the lower section of a grate bar as: assembled with the water cooling pipe.

Figure 3 is a perspective view showing ends of the upper and lower sections ofa grate bar. V r g I n I Figure is a transverse section of the bar, taken on the line 414 in Figure 2.

Figure 5 is a partial plan view of an alternative construction.

Referring more in detail to the drawings- 1 and 2 designate opposite side walls of a furnacefire box, by which a grate, designated-by reference numeral 3, is supported;

the grate consisting of a plurality of bars that are disposed closely together in parallel relation and'supported at their ends on shoulders 4 formed by the walls.

or base, section 5 and an upper, or cap, section'6 and these, preferably, are of the same dimensions with respect to width and length and are fitted flatly together and held in assembled relation by means of screws 7 extended therethrough. The upper sections are also provided at their ends with down- Figure 1 is a perspective view of a part of V 19217. se aifio. 194,108.

wardly projecting lugs 8 adapted to seat within notches, or recesses, formed inthe ends 'ofthe lower sections'as a means of retaining the parts against displacement A The upper sections of the b arsmay beflat 5 on top ormay have the top surfaces slightly crowned, as illustrated, and, extending'centrally of and in the longitudinal 'directionof the bars, are rows of apertures 9 and. likewise the adjoining edges of the bars are recessed 6 to provide openings '10 forthe passage ofair through the grate. I

Disposed between the ,upperand lower sections of 'eachbar is a'pipe coil112'forthe circulation of water as a cooling medium.

Thegcoil, asshown,:is of an elongated, U- shaped form extending nearly the length of thebar, and is seated within similarly formed cooperating channels 13 and 14 in the adjacent faces of the bar sections in order that the (0; sections will not be held in spaced relation bythepipe. e g 1 At one end of. the bar the .ends' of the pipe coil are turned downwardly through recesses; 15 and 1 6 in the end of tllGrlOWBl bar section 1 5:, and are" connected, respectively, with cold water supply and lead pipes 17 and E18; the connections with the latter 'pipes including cut-outvalves 19 and20. 1 c

In Figure 5 I have illustrated a construe 80,

tion in, which thewater ,p'ipes enter and leave the bar through notches on its side edges instead of at the ends. This avoids weakening the end of the bar where strength is desired. I y

7 In the construction illustrated, it is readily apparent that the cooling coil of each bar receives a flow of cold water from the supply pipe and this passes through the coil to the drain pipe from which it may be discharged, 9.0

or may be pumped into the boiler; the water beingslightly heated. Each of the grate bars comprises a lower,

A bar cooled in the above manner will last many times longer than an uncooled bar; they will standup under greaterheat and 5 will require practically no cleaning, thus reducingthe expense of upkeep and the time during which boilers are kept out of commission for repair or cleaning. Such bars also give increased combustion as the air ducts do not become clogged with fused material.

It is to be noted also that each bar has an independent circulation of water and that the circulation may be cut 03 from any bar when it is desired to disconnect and dismount the latter for replacement. Dismounting of the bars may be accomplished without the removal of the coil or its disconnection from the circulating pipes.

It is evident that the bars may be made in any suitable form, in one piece or cast in sections; that the coils may be varied in form and arrangement; that intake and outlet may be at the ends or anywhere between, and Water introduced from the sides or from above or below the bars and accordingly I claim the right to vary the form and arrangement of the parts in accordance with the'principle of the invention.

Having thus described my invention, what I claim as new therein and desire to secure by Letters-Patent, is:

A grate construction comprising in combination with water supply and return pipes, a plurality of base bars arranged in parallel edge to edge relation, a plurality of cap or cover bars removably fitted to said base bars respectively and likewise arranged in edge to edge relation and together forming the top surface of the grate; each of said base bars and its cap bar being provided in their adjacent surfaces with grooves together forming a channel that opens at its ends adjacent one end of the bar set, and a plurality of pipe loops, connected with the water sup ply and return pipes to afford circulation through said loops disposed within said channels between said base and cap bars but having no fixed connection with any part thereof and permitting of disassembly and removal of the bars without disturbing the loop or its connections.

Signed at Everett, Washington, this'18th day of May, 1927.

JOHN T. TAWLKS.

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