Improvements in or relating to Furnaces.
Year: 1892

page_text: Date of Application, 10th Nov., 1892
Complete Specification Left, 10th Aug., 1893-Accepted, 16th Sept., 1843
PROVISIONAL SPECIFICATION.
Improvements in or relating to Furnaces.
I, THOMAS EDWARD CADDY of Caddy and Company Limited, Daybrook in the
Borough of Nottingham, Engineer, do hereby declare the nature of this invention
to be as follows:-
:―
This invention relates more especially to apparatus applicable to furnaces
generally for rocking the firebars in order to facilitate the removal of inders and
other refuse from the bars whilst the fires are in operation, and is applicable to
furnaces in which tubular fire bars are employed; it also relates to improvements in
the shape of the tube employed in the construction of tubular fire bars so that such
bars may be made of a section which is more efficient when employed in connection
with rocking apparatus for removing refuse therefrom.
In carrying out this invention the front end of each alternate fire bar is carried
by an independent step secured to, or formed on the edge of the dead-plate, the
ends of the remaining fire bars being carried by a plate arranged on the underside
of the dead-plate, pivotted with projecting lugs which fit in between the steps on
the dead-plate and form bearers for the remaining alternate bars.
The additional plate is connected to the dead-plate preferably near the ends of
the fire bars and at each side by links pivotted respectively in the additional plate
and the dead-plate so as to be movable; these links may be formed with Teuds
adapted to pass through slots in the plates and fit into recesses formed above the
dead-plate and below the movable bearer plate. The slots and recesses in the
dead-plate and heads of the links may be protected by suitable covers to prevent
ashes and dust from interfering with the movement of the links.
The lower ends of the links may be connected by a bar secured to a projecting
foot on each link, so as to ensure a corresponding length of movement of each link
and a consequent uniform movement of the ends of the bearer plate.
The movable bearer plate and consequently every alternate bar is rocked by a
lever, pivotted to the dead-plate and connected by a link to the movable bearer
plate; the free end of this lever may be of sufficient length to be operated by hand,
or may be adapted to engage with the end of a supplementary bar.
The ends of those bars to which movement is communicated are connected to the
lugs on the movable bearer plate by pins in the bars or lugs engaging in corre-
sponding holes in the other part; or other convenient arrangement to retain them
in position may be employed.
The movable bearer plate is retained in its normal position by a catch pivotted
to the plate the free end of which engages with a bracket secured to the dead-
plate.
The foregoing arrangement may be used in connection with tubular fire bars
constructed according to my invention set forth in Specification No. 16404 of
15th Oct. 1890.
I however preferably employ tubes which are in section reduced in width at the
lower part so that the width of the fire bars below the upper face may be reduced
to make more clearance for the refuse so that it may readily fall between them
when the bars are rocked.
Tubular fire bars of the above described section may also be used with advantage
for furnaces in which the fire bars are fixed or stationary.
Dated this 10th day of November 1892
W. P. THOMPSON & BOULT,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in or relating to Furnaces.
I, THOMAS EDWARD CADDY of Caddy & Company Limited, Daybrook, in the
Borough of Nottingham, 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 :-
This invention relates more especially to apparatus applicable to furnaces
generally for rocking the fire-bars in order to facilitate the removal of cinders and
other refuse from the bars whilst the bars are in operation, and is applicable to
furnaces in which tubular fire-bars are employed; it also relates to the construction
of tubular fire-bars so that such bars may be made of a section which is more
efficient when employed in connection with rocking apparatus for removing refuse
therefrom.
The invention will be best understood by reference to the accompanying drawings
in which
Figure 1 is a longitudinal section and
Figure 2 a front elevation showing my invention applied to a boiler furnace.
Figure 3 is a cross section of a fire-bar.
Figure 4 is a cross section,
Figure 5 is a plan showing detail of movable bearer bar and operating
mechanism, and
Figure 6 is a cross section showing modification of detail.
Like letters indicate like parts throughout the drawings.
The front ends of alternate fire-bars a are carried by independent steps
secured to or formed on the edge of the dead-plate b, and the ends of the remaining
bars a' by a plate c arranged on the underside of the dead-plate provided with
projecting lugs c' which fit in between the steps b¹ and form bearers for the ends of
the bars a¹.
The plate is connected to the dead-plate 3 preferably near the ends of the
fire-bars and at each side as shown by links d pivotted respectively in the
dead-plate and plate c so that the latter is movable; the links d may be formed
with heads d' which are passed through slots d in the plates and fit into recesses
formed above the dead-plate and below the plate c.
The slots d2 and recesses in the dead-plate and heads d' of the links d may be
protected with covers e to prevent ashes and dust from interfering with the move-
ment of the links.
The movable plate c and bars a' are rocked by a lever g pivotted at g' to the
dead-plate b and connected by links to a lug on the plate c; the free end g² of
the lever g may be of sufficient length to be operated by hand or may be adapted
as shown to engage with the end of a bar which may be removed when not
required.
The ends of the bars al may be connected to the lugs c¹ on the plate by pins j in
the bars or lugs engaging in corresponding holes in the other part; or other
convenient arrangement may be employed to retain them in position.
The plate c may be held and prevented from tipping by studs k on the upper side
of and at the front of the plate c which studs k bear on the underside of the
dead-plate b. Where it is however desired to give the bars more motion one
or more rollers 7 may be placed between the dead-plate 6 and plate c inclined
surfaces being formed on the plate c so that the plate is tipped by the action
of the roller as it is moved forward. The roller is retained in position by
brackets m secured to the dead-plate 6 and a rack or racks n on the plate c engages
with teeth on the roller.
The plate is retained in its normal position by a catch o pivotted at o' to the
plate e the free end of which catch o engages with a bracket arm p secured to the
dead-plate b.

page_text: The foregoing arrangement may be used in connection with tubular fire-bars for
passing air through the bars.
I however (see Figure 3) employ tubes a³ which in section are reduced in width
at the lower part a' so that the width of the fire-bars a below the upper face may
be reduced to make more clearance for the refuse so that it may readily fall
between them when the bars are rocked.
Tubular fire bars of the section shown may also be used with advantage for
furnaces in which the fire-bars are fixed or stationary.
In the modification shown in Figure 6 the fore ends of the moving fire-bars a' are
formed with inclined ends a² as shown the inclination of which is approximately
parallel to the line of movement of those ends of the bars when they are rocked.
The edge of the dead-plate 6 between the steps is also bevelled to correspond
so that the bars may be raised and simultaneously moved forward by the action of
the plate c without any opening or gap occurring between the ends of the bars and
the dead-plate, into which refuse might fall and prevent the return of the bars to
their normal position.
The plate c may also be held in position as shown by preferably two links r, one
only of which is shown pivoted at r to the plate c and provided at their upper
ends with forks 2 engaging with pins or studs s secured to the dead-plate b.
This arrangement may be employed instead of the rollers and inclined
surfaces as the link may be arranged to give the necessary tilt to the plate c
and consequently to the bars.
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. In a furnace the combination with a dead or bearer plate such as 6 of a
rocking bearer plate such as c substantially as described and illustrated in the
accompanying drawings.
2. In a furnace the combination with a dead or bearer plate 6 of a rocking
bearer plate such as c carried by links such as d and operated by a lever such as g
substantially as described and illustrated in the accompanying drawing.
3. In a furnace the combination with a dead or bearer plate of a rocking
bearer plate such as c links such as d roller such as working on inclined surfaces
on the plate c and lever such as 9 substantially as described and illustrated in the
accompanying drawings.
4. In a furnace the combination with a dead or bearer plate 6 of a rocking bearer
plate such as c links such as d and r and lever such as g substantially as described
and illustrated in the accompanying drawings.
5. A furnace bar in which the tube which is cast therein is reduced in width at
its lower edge a' so that the thickness of the bar may be reduced below the upper
face to facilitate the fall of refuse between the bars when rocked substantially as
described and illustrated in the accompanying drawings.
6. The combination and arrangement of parts constituting the complete furnace
substantially as herein described and illustrated in the accompanying drawings.
Dated this 9th day of August 1893.
T. E. CADDY.
W. P. Thompson & Boult,
Agents for the Applicant.