IMPROVEMENTS IN FIRE-GRATES AND FURNACES FOR DOMESTIC AND OTHER: PURPOSES
Year: 1861

page_text: PROVISIONAL SPECIFICATION left by John Henry Johnson at the Office
of the Commissioners of Patents, with his Petition, on the 9th September
1861. A communication from Paul Baudet, of Paris, in the Empire of
France.
I, JOHN HENRY JOHNSON, of 47, Lincoln's Inn Fields, in the County, of
Middlesex, and of 166, Buchanan Street, in the City of Glasgow, North
Britain, Gentleman, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN FIRE-GRATES AND FURNACES FOR DOMESTIC AND OTHER:
PURPOSES," a communication from Paul Baudet,. of Paris, in the Empire of
France, to be as follows:-
This Invention relates to certain peculiar constructions and arrangements of
moveable fire-grates applicable either to domestic grates or to the grates of
steam boiler and other furnaces, whereby the necessity for stirring the burning
fuel to free it from ashes, cinders, or slag is obviated.
According to one arrangement applicable to domestic fire-grates, the grate
itself is pivotted or made to rock upon centres, the centres being situate rather
nearer to the front than the back of the grate, which will consequently incline
downwards towards the back. When the fuel requires stirring it is simply
requisite to depress two or three times the front of the grate, and allow it to
fall back again, the shaking thus produced being amply sufficient to clear out
all the dead ashes and other obstructions to the free access of air into and
amongst the fuel.
According to another arrangement the grate is stationary, but every

page_text: alternate bar in the bottom thereof is made to rise and fall by the aid of a
suitable lever and counterweight. As applied to locomotive furnaces one part
of the grate is inclined from the front to the back, whilst a portion thereof
next the back is horizontal, and has its bars extending from side to side of the
fire-box. In the inclined part of the grate each alternate bar at its lower end
rests upon a moveable or rising and falling bearer bar, the other bars of the
set resting upon a fixed bearer. By imparting a vertical motion to the
moveable bearer bar, by means of a suitable arrangement of levers and
counterweights, one half of the series of inclined bars will rise and fall
between the other half of the series, and thus by agitating the cinders will
allow of their escaping or dropping down freely. The horizontal part of the
grate may be made to rise and fall bodily in lieu of some of the bars only
being agitated, the same mechanism which works the inclined bars being
made to actuate the horizontal part of the grate.
According to another modification suitable for steam boiler furnaces of all
kinds, the bars are supported at their centre upon a transverse bearer, upon
which they are made to rock or oscillato alternately up and down by means of
cams or tappets acting upon the ends of the bars, and worked by a lovor
handle and counterweight; or in lieu of this rocking motion of the bars a
longitudinal sliding motion may be imparted to them by resting them on
on short vertical lever arms, which are made to rock or vibrate
to and fro by any simple contrivanco.
bearers c.