Improvements in or applicable to Mechanical Stokers.
Year: 1892

page_text: Date of Application, 23rd Nov., 1892
Complete Specification Left, 15th Aug., 1893-Accepted, 16th Sept., 1893
PROVISIONAL SPECIFICATION.
Improvements in or applicable to Mechanical Stokers.
I WILLIAM DENHAM GRIMSHAW of Plantation Works Accrington in the
County of Lancaster Calico Printer, do hereby declare the nature of this invention
to be as follows:-
This invention relates to improvements on that class of mechanical stokers
which feed the coal to the furnace by means of a fan and especially to those in
which a plate or plates are used to direct the fuel as it is thrown into the furnace,
such for example as the arrangement for which I obtained Letters Patent in Great
Britain No. 22569 dated the 28th day of December 1891.
Instead of using three fans as described in the Specification of the above Patent
and three fixed adjustable directing plates, I use one fan of about twice the width
shewn on the drawings accompanying the said Specification and in the centre of
the opening of the fan box into the furnace, I mount on a vertical pivot a plate
which as the fan throws the fuel on the fire is caused by suitable mechanism (say
an excentric and connecting rods and levers) to oscillate on its pivot.
It will be evident that as this plate is mounted vertically on a pivot at the centre
of the opening the angle taken by the plate will be first at one side and then at
the other side of such centre and the fuel as it is thrown into the furnace will be
directed first towards one side and then towards the other side of the fire and will
be heaped rather at the sides than the centre which is desirable in stoking.
This arrangement is also very simple and cheap in construction.
Dated this 22nd day of November 1892.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or applicable to Mechanical Stokers.
I WILLIAM DENHAM GRIMSHAW of Plantation Works Accrington in the
County of Lancaster, Calico Printer, 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 :-
This invention relates to improvements on that class of mechanical stokers which
feed the coal to the furnace by means of a fan and especially to those in which a
plate or plates are used to direct the fuel as it is thrown into the furnace, such for
example as the arrangement for which I obtained Letters Patent in Great Britair
No. 22569 dated the 28th day of December 1891.
My invention will be readily understood from the following description ou
reference to the accompanying drawings of which
Fig. 1 is a plan view showing my invention applied to a two flued boiler, and
Fig. 2 is a transverse section through one of the flues.
Instead of using three. fans as described in the Specification of the above Patent
and three fixed adjustable directing plates, I use one fan, or two fans a, in one
box a', of about twice the width shewn on the drawings accompanying the aforesaid
Specification, and in the centre of the opening a² of the fan box a¹ into the furnace
I mount on a vertical pivot b' a plate 6 which as the fan a throws the fuel on the
tire is caused by suitable mechanism (say an excentric and connecting rods and
1 Paino 427

page_text: b
levers) to oscillate on its pivot. I prefer however to move the plate by the
following mechanism :
Upon the centre or shaft of the worm wheel c (which gives motion to the feed
rakes or pushers as usual) I mount a pinion d revolving therewith and actuating
the toothed wheels d' which are provided with crank pins e each connected by a
rod to a sliding rack each rack 9 gears with a pinion h giving motion to a
similar pinion i on the pivot 6' of the rocking plate b.
Each plate b can thus be worked independently of the other and its action can be
regulated by adjusting its crank pin e nearer to or further from the centre of the
wheel d'.
It will be evident that as this plate is mounted vertically on its pivot b¹ at the
centre of the opening a the angle taken by the plate 6 will be first at one side
and then at the other side of such centre (see dotted lines Fig. 1) and the fuel as
it is thrown into the furnace will be directed first towards one side and then towards
the other side of the fire and will be heaped rather at the sides than the centre
which is desirable in stoking.
This arrangement is also very simple and cheap in construction.
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 :-
The combination with a fan or a pair of fans throwing fuel into the furnace of a
centrally mounted directing plate working upon a vertical pivot and so actuated
as to incline first to one side of the furnace and then to the other and thereby
direct and spread the fuel substantially as and for the purposes hereinbefore set
forth.
Dated this 14th day of August 1893.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicant