Improvements in Fire Bars or Grates.
Year: 1890

page_text: Date of Application, 28th Mar., 1890
Complete Specification Left, 5th Nov., 1890-Accepted, 6th Dec.. 1890
PROVISIONAL
SPECIFICATION.
Improvements in Fire Bars or Grates.
I, DAVID PURVES of "Ferro Dene" North Dulwich, in the County of Surrey
Engineer, do hereby declare the nature of this invention to be as follows:-
Various methods have heretofore been proposed for cleaning the fire bars or grates
from accumulated ashes or cinders.
The present invention relates to improved means for accomplishing this result, and
to this end consists in providing with or forming the grate of fire bars capable of
being rotated on their own axial lines either independently of or in conjunction with
each other.
The fire bars may be made with any suitable cross section or may be made of a
series of separate rods carried by supporting pieces or plates in order to permit the
draught to pass freely between them.
The desired rotation of the fire bars may be effected by rack and pinion, chain
gear or other suitable rotary or reciprocating motion.
Dated thi: 28th day of March 1800
PHILIP M. JUSTICE,
55 & 56, Chancery Lane, London, Applicant's Agent.
COMPLETE SPECIFICATION.
Improvements in Fire Bars or Grates.
I, DAVID PURVES formerly of "Ferro Dene" North Dulwich, in the County of
Surrey, but now of 10 Holland Park Gardens in the County of Middlesex, Engineer,
do hereby declare the nature of this invention and in what manner the same is to
be performed, to be particularly described and ascertained in and by the following
statement :-
My invention relates to improvements in fire bars or grates adapted for marine or
other boilers and consists in so constructing the bars that they may be readily cleared
from accumulated ashes or cinders.
Various means and constructions of bars have heretofore been employed for this
purpose.
My invention consists in providing or forming the grate with fire bars capable of
being rotated (or partly rotated) on their own axial lines either independently of or in
conjunction with each other. The bars may be of any suitable cross section and may
be inade of a series of separate rods or bars carried by supporting pieces or plates
and spaced apart in order to permit the draught to pass freely between them. The
desired rotation or partial rotation may be effected by rack and pinion, chain gear or
other suitable rotary or reciprocating motion.
In the accompanying drawings I have illustrated the best means known to me at
the present time of carrying my invention into effect.
Referring first to Figs. 1 and 2 the former is a front elevation of a double flue
boiler, the flue on the left being a section or line x x of Fig. 2 which in turn is a
side sectional elevation through one of the flues.
The fire bars consist of a number of rods or bars a spaced apart by the plates or
discs b through which said rods pass. Each compound bar is carried in bearings e d,
the latter forming part of a bracket near the bridge e. At the other end each bar
carries a pinion which engages with a similar pinion on the bar next in order.
The end bar carries in addition a worm wheel g which when operated by a worm h
causes a rotary movement to be imparted to each bar, each one travelling in the
D

page_text: opposite direction to that next in order, the movement being continuous or not as
desired. The shaft on which is the, worm h may have a reversible clutch i on same in
order that the movement of the bars may be reversed, or a toothed quadrant may be
employed to gear with one of the pinions so that a partial rotation each way will
be given to each bar, or a reciprocating rack may engage with the pinions, the latter
being then separated and not engaging with each other, and in this case the bars will
all be rotated in the same direction. It will be seen that any of these motions will
impart a constant clearing action to the bars.
Instead of giving the bars a complete rotation they may be caused to perform
only a partial one in each direction on their own axes in the manner illustrateu in
Figs. 3 and 4, the former being a longitudinal section through one flue of a boiler,
and the latter a front elevation of same, the left hand flue being in section on the
line jj. Fig. 3..
In these figures each bar is composed of a number of smaller ones a, (in this
instance five) cast together and connected at intervals by webs, or if desired they may
be built up of separate pieces connected together so as to form a grid and terminating
at each end on a trunnion carried on bearings c d at either end. Each complete bar
at the forward end has a drop piece thereon, all of which are connected to a
horizontal bar by pivot pins m. The centre bar has a longer pin n to which is
pivoted a link o, pivoted in turn to an arm p carried by a squared rod q in bearings rr
secured to the bottom of the flue. To this rod g is connected a handles which on
being reciprocated will impart a partial rotation to each bar or grid, so that they are
alternately brought into the position shown in dotted lines on the left of Fig. 4, the
rotation being effected of course on the trunnion or axis of each bar. The motion
thus gained as will be seen gives the necessary clearing action to the bars causing the
small cinder and ash to fall through same.
It will be evident that other means may be employed for imparting motion to the
bars than those described, for instance the bars illustrated in Figs. 3 and 4 may each
be provided with a pinion such as at the forward end, said pinions being operated
by a reciprocating toothed rack or by a quadrant as previously described.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
1. A grate composed of several bars built up of a number of bars or rods spaced
apart and connected together, each being carried in a bearing, the several bars
being connected and operated so that a rotation or partial rotation can be given to
same, substantially as described.
2. A grate composed of several bars built up, of a number of rods or bars spaced
apart and connected together each carried in a bearing and having pinions connected
with gearing or devices adapted to impart a rotation or partial rotation to same,
substantially as described.
Dated this 5th day of November 1890.
PHILIP M. JUSTICE,
55 & 56, Chancery Lane, London, Applicant's Agent.