US83689A - Improvement in grate-bars for furnaces - Google Patents

Improvement in grate-bars for furnaces Download PDF

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US83689A
US83689A US83689DA US83689A US 83689 A US83689 A US 83689A US 83689D A US83689D A US 83689DA US 83689 A US83689 A US 83689A
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bars
grate
improvement
furnaces
fuel
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23HGRATES; CLEANING OR RAKING GRATES
    • F23H17/00Details of grates
    • F23H17/12Fire-bars

Definitions

  • Figure 2 is a transverse section 5 and Figure 3, a perspective view of the under side of the same.
  • the -nature, of my invention consists in constructing grate-bars with vertical lateral ribs, in combination with a depressed central web, pierced with obliquely-trans verseopenings or air-passages, as hereinafter set forth;
  • a A constitute the vertical ribs or supporting-portions of each bar
  • the grate or fire-bar presents so large a surface to the fuel which it supports, as to materially intercept the entrance of air, rendering the combustion slow and imperfect at the points in contact with the bar. f
  • This defect results from the considerable size required to insure the requisite strength under the' weight of the fuel when the metal is weakened by the My improved construction obviates this, by making the bar very strong vertically, in consequence of the great depth of the ribs Aand by avoiding vthe overheating of the metal, by the large amount of surface exposed to the cold air, and the very small surface which is in direct contact with the fuel, it being only the top, a, of the libs, and from this construction also result the advantages of admitting air to the fuel, through nearly the whole of the space occupied by the bar, and of preventing the fuel or cinders from compacting upon the top of the bar, while the bars are both light and strong, and possess increased durability.
  • the ribs standing above the web at the sides may be of any height and thickness that may be needful, and very suitable dimensions are half an inch rise above the surface of the web, and a thickness of half an inc h on the level of the top of the web, b evelled off to the top ofthe rib, to facilitate lifting and moulding.
  • These vsides keep the fuel more hollow orlocse, and cause the air to act more evenly and eii'ectually through the fire, thus producing more heat with less fuel.
  • a tire-bar constructed with vertical side ribs A A, having raised ledges c a, in combination with the depressed web B and oblique opening c, substantially as and for the purposes set forth.

Description

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WILLIAM COLBORNE CAMBRIDGE, OF BRISTOL, GREAT BRITAIN, ASSIGNOR TO HEL SELF ANI) J. T. GRIFFIN, OF NEW YORK CITY.
Letters Patent No. 83,689, datati Noveafnbco` 3,' 1868.
IMPROVEMENT IN G'RATE-BARS FOR FURNACES.
The Schedule referred to in these Letters Patent and.making part of the same- To all whom itma/y concern:
Be it known that l1, WILLIAM ,GOLBORNE OAM- BRIDGE, of Bristol, in the Kingdom of Great Britain, engineer', have invented a new and useful Improvement in Furnace-Grate Bars; and I do hereby declare that the following is a\full and exact description thereof, reference being had to the accompanying drawing, in which- Figure 1 is a perspective View yof the top tion of one of my improved bars;
Figure 2 is a transverse section 5 and Figure 3, a perspective view of the under side of the same.
Like letters designate corresponding parts in all of the figures.
The -nature, of my invention consists in constructing grate-bars with vertical lateral ribs, in combination with a depressed central web, pierced with obliquely-trans verseopenings or air-passages, as hereinafter set forth;
As represented in the drawings, A A constitute the vertical ribs or supporting-portions of each bar, and
of a por- B B, the central web uniting them, which is pierced by the cells or openings o o.
The ribs standing above the surface of the web, at a.' a, keep the fuel, to a great extent, from resting on the latter, thereby leaving aspace for the circulation of air above the surface of the ribs B, which not only keeps the metal from becoming overheated, but, by diffusing air more generally through the fuel, produces more perfect combustion. v
Ordinarily the grate or fire-bar presents so large a surface to the fuel which it supports, as to materially intercept the entrance of air, rendering the combustion slow and imperfect at the points in contact with the bar. f This defect results from the considerable size required to insure the requisite strength under the' weight of the fuel when the metal is weakened by the My improved construction obviates this, by making the bar very strong vertically, in consequence of the great depth of the ribs Aand by avoiding vthe overheating of the metal, by the large amount of surface exposed to the cold air, and the very small surface which is in direct contact with the fuel, it being only the top, a, of the libs, and from this construction also result the advantages of admitting air to the fuel, through nearly the whole of the space occupied by the bar, and of preventing the fuel or cinders from compacting upon the top of the bar, while the bars are both light and strong, and possess increased durability.
I do, not confine myself to any particular size or pro;
portion of the ribs or openings, only that they are fomned `between ribs Vraised vertically at each side of the bar, the said openings tapering upwards, leaving, at the top, portions of metal between ysuch openings, of greater thickness than at the bottom of each of said bars, and these openings may extend obliquely across Afrom one4 side of the bar to the other,V or they may be turned off -at an angle, as shown.` The length and strength of the said bars may bewaried according to circumstances.`
The ribs standing above the web at the sides, may be of any height and thickness that may be needful, and very suitable dimensions are half an inch rise above the surface of the web, and a thickness of half an inc h on the level of the top of the web, b evelled off to the top ofthe rib, to facilitate lifting and moulding. These vsides keep the fuel more hollow orlocse, and cause the air to act more evenly and eii'ectually through the fire, thus producing more heat with less fuel.
What I claim as my invention, and desire to secure by Letters Patent, is-
A tire-bar, constructed with vertical side ribs A A, having raised ledges c a, in combination with the depressed web B and oblique opening c, substantially as and for the purposes set forth.
In witness where0f, I have hereunto signed my name` in the presence of two subscribing witnesses.
NVILLIAM COLBORNE CAMBRIDGE.
Witnesses:
STC. EAs'rMAN, JOHN G. DoDDs.
US83689D Improvement in grate-bars for furnaces Expired - Lifetime US83689A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050131422A1 (en) * 2003-12-16 2005-06-16 Anderson David G. Methods and devices for spinal fixation element placement
US20050131421A1 (en) * 2003-12-16 2005-06-16 Anderson David G. Methods and devices for minimally invasive spinal fixation element placement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050131422A1 (en) * 2003-12-16 2005-06-16 Anderson David G. Methods and devices for spinal fixation element placement
US20050131421A1 (en) * 2003-12-16 2005-06-16 Anderson David G. Methods and devices for minimally invasive spinal fixation element placement

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