Furnaces.
Year: 1889

page_text: Date of Application 13th Mar., 1889
Specification Accepted, 13th Apr., 1889
Furnaces.
I, AXEL VALDEMAR BAY of Nakskov in the Kingdom of Denmark, Steam Mill Owner
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:
In order to make the draught regulating dampers for furnaces and especially such
as those patented 2nd January 1888 No. 30 automatic in their action so that the
opening of the damper for the inlet of the draught to the furnace or fireplace may be
effected automatically by the shutting of the furnace door after completing the firing
and not by the stoker, the draught regulator is connected to the said door in the
manner shown on the accompanying drawing.
Figure 1 is a front elevation partly in section showing the door of the fire place bas
applied for instance to a steam boiler a together with the regulator R and the con-
noction between the latter and the door of the furnace.
Figure 2 is a plan section on the line X X Figure 1 and shows the furnace door and
the parts belonging thereto.
Figure 3 is a side clevation showing the same parts as Figure 1 the furnace door
being shown in vertical section on the line Y Y Figure 1.
The construction of the regulator R is such that the opening of the furnace damper
to be regulated is operated in such manner that the piston rod of the regulator is
2 represents the chain,
pushed downwards in its cylinder by mechanical agency.
which leads over grooved chain wheels from the piston rod of the regulator to the
damper or ashpan door of the furnace.
The aforesaid connection between the regulator R and the furnace door b is obtained
by means of a chain sector d mounted on and fixed to the door and concentric with
the hinges thereof and a transmission apparatus A to be described further on and the
chains o and f.
One end of the chain fis fastened to the furnace door 6 and is conducted from
thence over the chain sector d and suitable guide pulleys or rollers u to the grooved

page_text: chain pulley which is mounted loosely on the axle 1 in the aforesaid transmission
apparatus A and from thence over this pulley to a weight in which hangs free from
this end of the chain.
The chain o leads from the frame c which is connected to the piston rod of the
regulator to a grooved chain pulley & keyed on to the shaft in the transmission
apparatus A. The end of the chain o is fixed in the groove of the pulley k. The
several parts take the position shown on the drawings directly before the firing takes
place. If the furnace door he then opened for firing up, the weight (suspended
from the end of the chain) sinks and turns the loose chain pulley g which is mounted
on the shaft. A pawli mounted on the chain pulley g and acted upon by a spring
also mounted on the chain pulley then takes into a ratchet wheel. The ratchet i is
held away from the teeth of the ratchet wheel by means of an adjustable stop
shown by dotted lines in Figure 1 and in full lines in Figure 4) until the door is
opened. The chain pulley continues to turn during the opening of the furnace door
either until the said door is wholly opened,or until the weight m has moved so far that
it rests upon a bracket n.
(as
The bracket n is mounted on a vertical adjustable rod j which is fixed to the under-
part of a box open at the top and serving us a kind of stand and casing for the parts
of the transmission apparatus. It should be mentioned that the front side in Figure 1
and in Figure 2 the side wall nearest to the observer are shown removed in order that
the several parts of the transmission apparatus may be seen. The before mentioned
stop 7, is as shown in Figure 4 fixed to the front wall of the casing v in a slot con-
centric with the spindle so as to be adjustable. When the furnace door b is again
closed after firing the chain fis first put in tension, in the case where the weight m has
come to rest on the bracket n before the furnace door is fully opened and thereupon
the woight m is again raised to its previous height by the turning of the chain pulley g
to the former opposite side as shown on the drawing. As the ratchet i now takes into
the ratchet wheel the latter together with the shaft and chain pulley k will be
thereby simultaneously revolved, and consequently the frame c of the regulator R
and its piston rod will be drawn downwards during the oponing of the valve by
means of the chain p. The before inentioned revolving of the chain wheel with
the ratchet wheel the shaft and the chain pulley will continue until directly
before the complete closing of the furnace door b. The ratchet will then strike
against the stop and be thereby taken out of the ratchet wheel so that the
shaft together with the cluin pulley k the ratchet wheel and also the frame_c
and piston rod in the draught regulator are released from the chain pulley g. In
consequence the furnace damper commences its slow descent under the influence
of its own and other weights as required and the friction in the damper regulator.
By this means the chain pulley k together with the shaft and ratchet wheel h
is by degrees turned back into the position shown on the drawing where a lug s
on the chain pulley & comes against a stop t on the front wall of the casing v
thereby preventing the further descent of the valve.
In order that the stop may be fixed according to the extent to which the
damper is to cut off the draught the said stop is mounted in a slot concentric
with the shaft wherein it may be fixed as required.
It will be evident herefrom that by adjusting the height of the bracket n on the
vertical rol the extent to which the damper will be opened directly before firing
may be adjusted and that the limit of the closing of the damper between the firing
operations can be regulated by adjusting the stop t.
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 :-
First. In connection with the draught regulating dampers such as herein referred
to the employment of a transmission apparatus A in combination with the chain
sector d mounted on the furnace door and concentric with the hinges thereof,
the connecting chains and for obtaining an automatic working of the regulator,

page_text: the transmission apparatus being provided with a chain pulley y that is mounted
loosely on the shaft of the apparatus, except during the closing of the furnace
door b during which time when it is turned by the connecting chain and its
weight m and by means of a ratchet i acted upon by a spring on the chain
pulley and by means of a ratchet wheel h keyed onto the shaft ; the said
shaft carries with it the chain pulley for opening the valve by means of the
chains and and the frame c of the regulator whereupon the ratchet i is auto-
matically released from the ratchet wheel during the latter part of the closing
of the furnace door.
Second. In combination with a regulator which automatically effects the gradual
closing of the damper of a furnace the application of an apparatus A constructed
substantially as described and a chain connection to the fire door and a weight on
said chain in such manner that the closing of the fire door effects the full opening
of the damper which is thereupon gradually closed to the required degree by the
regulator substantially as set forth.