Improvements in Mechanical Stokers and Steam Boiler Furnaces.
Year: 1891

page_text: Date of Application, 3rd June, 1891
Complete Specification Left. 12th Feb. 1892-Accepted. 12th Mar.. 1892
PROVISIONAL SPECIFICATION.
Improvements in Mechanical Stokers and Steam Boiler Furnaces.
We ANDREW BELL and ANDREW JAMES BELL both of 298 Lower Broughton
Road, Manchester Engineers do hereby declare the nature of this invention to be
as follows:-
We make the furnace bars when placed in position in the flue in the form of a
semi-circle, the highest part to be the centre of fire longitudinally, thereby bringing
the fire in closer contact with the upper-sides of flue, and obtaining also a larger
body of fire against the sides of flue horizontally, where it is most required and
gaining also a larger heating surface. This furnace is applicable to steam ship
boilers as well as, all stationary or land boilers, and also to furnaces in general.
The improvements in mechanical stokers which we claim either in conjunction with
the semi-circle furnace or otherwise, is the shape of pusher or plunger which
pushes forward the coal or fuel into the furnace namely, "a semi-circular pusher."
Dated this Second day of June 1891.
ANDREW
BELL.
ANDREW J. BELL.
COMPLETE SPECIFICATION.
Improvements in Mechanical Stokers and Steam Boiler Furnaces.
We, ANDREW BELL and ANDREW JAMES BELL both of 298 Lower Broughton
Road Manchester in the County of Lancaster Engineers 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 the construction and arrangement of furnace bars in the
flues of steam ship boilers, stationary or land boilers, and furnaces in which
moveable bars are employed in connection with mechanical stokers, whereby said
furnace bars are placed in position in the flue either in the form of a semicircle or
with the centre of furnace higher than at the sides, and in combination therewith a
pusher or plunger for pushing forward the coals said pusher or plunger being of a
semicircular or other shape on the under side to correspond with the surface outline
in which said furnace bars are or may be arranged.
The object of this invention is to form the flues of furnaces in which moveable
fire bars are employed, so that the centre of the fire longitudinally may be higher
than at the sides and thereby cause the fire to come in closer contact with the upper
sides of flue.
We attain this object by the mechanism hereinafter described and as illustrated
in the accompanying sheet of drawings.
In the several views therein shown similar letters refer to similar parts.
Fig. 1 represents part front elevation and part sectional elevation of a boiler
with our invention applied.
Fig. 2 is longitudinal section of the same furnace.
In this invention we construct a flue furnace a with, moveable bars b placed
preferably in a semicircular position as shown in Fig. 1. We form a pusher c in
which is a furnace door d with the under side of said pusher c of a shape corre-
sponding to the outline of the upper surface of the moveable fire bars b.
We place a cranked shaft e in a horizontal position in front of the ends of fire
bars to which said bars are connected and by which they are actuated in the

page_text: ordinary manner. We attach a bracket or fulcrum f in a convenient position at
either side of the dead plate 7 and affix a lever to each of said brackets.
We connect the lower end of each of the levers to one of the cranks of
aforesaid shaft e and the upper ends of said levers we connect at j and to the
pusher C. When the shaft e is caused to rotate the pusher c is actuated in the same
manner as the fire bars b by means of the fulcrum bracket and the lever which
causes said pusher to be alternately pushed forward and drawn back any prearranged
distance.
By these means we construct a furnace with moveable fire bars either of a semi-
circular or other form in which the centre is at a higher level than on each side and
with a pusher or plunger of a like form for pushing forward the coals.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what
we claim is :-
1st. In a furnace in which moveable fire bars are employed, the arrangement of
said bars in a semicircular or like form by which a higher level is obtained in the
centre than on each side of said furnace, in the manner and for the purpose
substantially as hereinbefore described.
2nd. In a furnace in which moveable or other fire bars are employed and arranged
either in a semicircular or like form the use of a pusher or plunger for pushing
forward the coals, with the under side of said plunger of a shape corresponding to
the surface outline of fire bars, and with a furnace door such as d formed therein,
substantially as hereinbefore described.
3rd. In a furnace in which moveable fire bars are employed and arranged either
in a semicircular or like form, the fulcrum in combination with the shaft e for
actuating a pusher or plunger for the purpose and in the manner substantially as
hereinbefore described.
Dated this 11th day of Febru 1805
THOMAS PRESCOTT,
53, Arcade Chambers, St. Mary's Gate, Manchester,
Agent for Applicants.