RESERV Apparatus and other Furnaces.
Year: 1886

page_text: Date of Application, 4th Oct., 1886.
Complete Left, 24th June, 1887.
Complete Accepted, 9th Aug., 1887.
RESERV
Apparatus and other Furnaces.
I, EDGAR CONISTON MILLS of No. 49, Victoria, Buildings, Manchester in the
county of Lancaster, Mechanical Engineer do hereby declare the nature of this
invention to be as follows:-
My invention consists of apparatus for controlling the orifice for the admission of
air to furnaces or of the flue damper of Boilers or Heaters of Heating Apparatus in
which a fluid circulating in pipes is the medium for the convection of Heat, the said
apparatus operating to enable the temperature of the fluid returning to the Boiler to
effect the said control.
Within a straight length of the "return ” pipe I insert a rod of copper or other
suitable metal fixing it rigidly at one end to the pipe and allowing the other end to
slide freely through a stuffing Box the pipe being preferably bent at this end to allow
space for the exterior mechanism. This "expansion rod" is held in its place laterally
by small brackets within the pipe and affording the least possible obstruction to the
flow of the fluid.
At its outer end beyond the stuffing box the rod abuts against a Lever Arm which
presses against a Sliding Block, whose guides may be formed in the wall of the frame
or Box enclosing the whole of the multiplying apparatus.
Against the inner end of this block rest the ends of two inclined arms or struts.
Against a fixed but adjustable abutment attached to the opposite wall of the box or
frame rest the ends of two other similar struts. All these four are preferably equal in
length and are formed with knife edges at both ends.
The upper struts of the first and second pair abut against suitable "V" grooves
formed in the lower end of a vertical sliding pillar and the lower struts of each pair
abut against similar grooves in the upper end of another vertical sliding pillar. These
pillars are guided and actuated at their adjacent ends by the said struts alone but at
their outer ends they slide in guides formed in a suitable part of the frame. They
carry near their outer ends a collar or shoulder to which are attached by pin, knife
edge and hook or equivalent means two inclined tension rods to each pillar, a plane

page_text: passing through all these rods being at right angles to the plane of the struts before
described. In the same said Plane and passing between the adjacent ends of the
pillars and sliding at both its ends in guides formed in the frame is a tube whose
tendency is to slide towards the front of the Box or frame when pressure is exerted
upon the Sliding Block first before mentioned.
The connection is formed either by a link which connects one pair of the tension
rods pressing against a pin passing transversely through the tube or by equivalent
means.
The other pair are also joined by a link which passes through a slot in the tube the
said link being connected to or in contact with a rod in the interior of the tube;
or the rods themselves may be connected to the internal rod. Upon the outer or front
end of the sliding tube is mounted a Bracket carrying the fulcrum of an oscillating
lever to which is also attached the rod. whose ends projects from the interior of the
tube.
The other end of the lever may be formed as a grooved quadrant and actuates the
draught door or damper by a chain and lever or other suitable connection.
The tension due to the weight of the door, damper or counterpoise is transmitted
through the parts herein described, maintains the stress always in one direction and
presses the first mentioned lever against the end of the expansion rod.
When by reason of the heat or increased heat of the fluid in the return pipe the
said rod expands the slight motion of its free end is multiplied largely by the slight
angularity of the strut arms and tension rods forming what I term a combined
horizontal and vertical "lazy-tongs" and the motions of the final pairs of rods are
added together by the quadrant lever whose fulcrum mounted on the sliding tube,
travels in one direction while its " power contre is caused by the internal rod to
travel in the opposite direction the "weight" or quadrant end thus traversing twice
the distance it would if its fulcrum were stationary.
22
I may get a further increase of motion by attaching the chain near to the centre of
motion of the lever which actuates the door or damper.
I preferably enclose the whole of the multiplying arrangement in a box which
serves as a frame to carry some portions of the mechanism and for other portions I
may fix a light frame inside the Box.
My main object in constructing the multiplying apparatus as herein described in
preference to the use of wheels or levers is to dispense with the necessity for
lubrication and with all liability to clog with soot or dust and so get out of order.
But I may use any ordinary multiplying apparatus with my expansion rod in the
return pipe, and I may use my multiplying apparatus with other arrangements of
expanders operating upon draught doors or dampers.
Dated this 2nd day of October 1886.

page_text: I EDGAR CONISTON MILLS of No. 49 Victoria Buildings Manchester in the County
of Lancaster Mechanical 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 consists of apparatus for controlling the orifice for the admission of
air to furnaces or of the flue damper of Boilers or Heaters of Heating Apparatus in
which a fluid circulating in pipes is the medium for the convection of heat, the said
apparatus operating to enable the temperature of the fluid returning to the boiler to
effect the said control.
In order that the nature of my invention may be clearly understood I append hereto
the accompanying drawings.
Fig. I. is a sectional elevation of the expansion & multiplying apparatus.
Fig. II. is a plan of the same.
Fig. III. is a cross section of the multiplying apparatus.
Fig. IV. shews a method of attaching and operating the Draught Regulator door.
Within a straight length of the "return" pipe d I insert a rode of copper or other
suitable metal fixing it rigidly at one end to the pipe and allowing the other end to
slide freely through a stuffing box g the pipe being preferably bent at this end to allow
space for the exterior mechanism. This "expansion" rod e is held in its place laterally
by small brackets within the pipe and affording the least possible obstruction to the
flow of the fluid.
The bracket & may be used to ensure that there shall be no motion of the rod e at
this end, and this bracket may be fixed to a plate not shown, the other end of the plate
having bolted to it the box B.
At its outer end beyond the stuffing-box the rod abuts against a lever arm o which
presses against a sliding block p, whose guides may be formed in the wall of a frame
or Box H enclosing the whole of the multiplying apparatus.
Against the inner end of this block rest the ends of two inclined arms or struts s.
Against a fixed but adjustable abutment q attached to the opposite wall of the box

page_text: or frame rest the ends of two other similar struts s'. All these four are preferably
equal in length and are formed with knife edges at both ends. The upper struts of
the first and second pair abut against suitable "V" grooves formed in the lower end
of a vertical sliding pillar and the lower struts of each pair abut against similar
grooves in the upper end of another vertical sliding pillar
These pillars are guided and actuated at their adjacent ends by the said struts alone
but at their outer ends they slide in guides formed in a suitable part of the frame or
in a separate bracket t fixed within the box H.
They carry near their outer ends a collar or shoulder to which are attached by pin,
knife edge and hook or equivalent means two inclined tension rods v to each pillar see
Fig. III. a plane passing through all these rods being at right angles to the plane of
the struts before described.
In the same said plane and passing between the adjacent ends of the pillars and
sliding at both its ends in guides formed in the frame H is a tube w whose tendency
is to slide towards the front of the box or frame when pressure is exerted upon the
sliding block p. The connection is formed either by a link r which connects one pair
of the tension rods pressing against a pin passing transversely through the tube w or
by equivalent means. The other pair are also joined by a link which
y
passes through
a slot in the tube the said link being connected to or in contact with a rod in the
interior of the tube or the rods themselves may be connected to the internal
rod.
Upon the outer or front end of the sliding tube is mounted a bracket 1 carrying the
fulcrum 2 of an oscillating lever 3 to which is also attached the rod whose end
projects from the interior of the tube.
The other end of the lever may be formed as a grooved quadrant and actuates the
draught door or damper by a chain 4 and lever or other suitable connection.
The tension due to the weight of the door, damper or counterpoise is transmitted
through the parts herein described maintains the stress always in one direction and
presses the lever o against the end of the expansion rod.
When by reason of the heat or increased heat of the fluid in the return pipe the
rode expands the slight motion of its free end is multiplied largely by the slight
angularity of the strut arms s and tension rods v forming what I term a combined
horizontal and vertical "lazy-tongs" and the motions of the final pairs of rods are
added together by the quadrant lever 3 whose fulcrum mounted on the sliding tube w
travels in one direction while its "power" centre is caused by the internal rod z to
travel in the opposite direction the "weight" or quadrant end thus traversing twice
the distance it would if its fulcrum were stationary.
I may get a further increase of motion by attaching the chain near to the centre
of motion of the lever 5 see Fig. IV. which actuates the door or damper 6.
At 7 in Fig. IV. is shewn an adjustable shackle for adjusting the length of chain 4
and so adjusting the point of temperature at which the door closes: such shackle
however forming no part of my present invention. Instead of the lever 5 the chain 4
may be attached to a bobbin on the shaft of the door 6 or to a hinge or in any
convenient way.
My main object in constructing the multiplying apparatus as herein described in
preference to the use of wheels or levers is to dispense with the necessity for lubrica-
tion and with all liability to clog with soot or dust and so get out of order. But I
may use any ordinary multiplying apparatus with my expansion rod in return pipe
and I may use my multiplying apparatus with other arrangements of expanders
operating upon draught doors or dampers.
In some cases in which there are more than one return pipe to a Boiler the pipe d,
instead of being a portion of the main circulating system may be a special short
length of pipe with separate attachment at either end to the lower part of the Boiler
preferably at different levels so as to maintain a circulation whereby the temperature
in the pipe d will always correspond with that in the lower part of the boiler which
in turn will represent the average temperature of the various return pipes.

page_text: Having now particularly described and ascertained the nature of my said invention,
and in what manner the same is to be performed I declare that what I claim is :-
I. In Heating apparatus in which a fluid circulating in pipes is the medium for
the convection of heat, controlling the admission of air to the furnace by the expan-
sion and contraction of a rod of copper or other suitable metal immersed in that
portion of the fluid which is just about to return to the Boiler to be reheated or in the
said fluid immediately after its return to the boiler, and before it has had time to be
appreciably raised in temperature substantially as hereinbefore described and illustrated
in the accompanying drawings.
II. The use and construction of a multiplying apparatus with horizontal and
vertical lazy-tongs acting substantially as and for the purposes hereinbefore described
& illustrated in Figs. I. and III. of the accompanying drawings.
III. The sliding tube, internal rod, and lever with moveable fulcrum whereby the
two motions of tube and rod are added together substantially as hereinbefore
described and illustrated in Figs. I. and III. of the accompanying drawings.
Dated this 22nd day of Inns 1007