Damper Regulators for Fire-places and Furnaces.
Year: 1889

page_text: Date of Application, 5th June, 1859-Accepted, 13th July, 1889
Damper Regulators for Fire-places and Furnaces.
I VILHELM LUDVIG JESPERSEN of Nykjóbing on Fálster in the Kingdom of
Denmark, Machine Manufacturer, 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 :-
The object of the present invention is to provide means for automatically closing
the dampers of fire places at a predetermined rate, with the view of regulating the
combustion of the fuel.
C,
The regulator consists of a double pulley, in the accompanying Drawing Figs. 1, 2
(front view and vertical section) marked a, which is loose on the axle b, but, by a
pawl wheel
which is firmly keyed on the same axle, as well as two pawls with
springs, placed within the pulley, causes the axle, in one direction, to take part in
the rotating movement of pulley, while the pulley independent of the axle can be
moved round in the opposite direction.
On the axle b is firmly keyed a cog wheel d, which takes into the pinion e, which
is fixed on the same axle as a drag wheel, the motion of which is controlled in the
usual manner, just as in a watch, by a common balance with a spiral spring (Fig. 4),
or by a pendulum (Figs. 1, 2).
On the double pulley a, is fixed the chain g in the one chain groove, which
chain is in connection with, and holds up the damper, which, by its weight, tends
to close and shut off the draught from the fire place. Under particular circum-
stances, for instance, in steam boilers, which are not built in, the chain 9 may as
easily be placed in connection with the door in front on the boiler through which the
air is conducted to the fire place.
The chain pulley is caused, by the weight of the damper, to rotate, and the
rotation is regulated to a uniform speed by the pendulum or the balance, the speed
being capable of variation, when the pendulum is used, by fixing the pendulum-
weight higher or lower on the pendulum bar, and when the balance is used, by
tightening or slackening the spring in the same."
The speed with which the chain g unwinds itself, with which consequently the
damper shuts, is, on the contrary, not uniform, as the periphery of the chain pulley
is not circular, but has got the form which, according to practical trials, makes the
damper to shut with the speed that is best fit to promote the burning, without leading
the heat away unnecessarily.
In the second chain groove on the double chain pulley, is fixed a chain k, which
carries a counter weight m, the size of which is apportioned in such a manner,
according to the pull which the damper chain 9 causes, that on the latter is
imposed sufficient overweight to continue the movement of the pendulum or the
balance.
9
This chain groove is constructed in such a way relative to the first chain groove,
that the moving power which impels the pendulum or the balance, at every point of
the movement, is impelling it with the same force. The chain k is fixed in such a
manner that it winds itself up on the pulley at the same time that the unwinding of
the chain g is effected.
When the burning has progressed so far, that it is necessary to fire anew, which
moment may be stated automatically by a bell signal or something similar put in
connection with one of the chains, the damper will be nearly closed, and can be
re-opened immediately, on the firing having taken place, by drawing the counter-
weight m down into its lowest position; the double chain pulley, while the chain k is
unwinding itself, will then rotate in the opposite direction, and will wind the damper
chain up on its excentric groove.
a

page_text: The axle and the cog wheel etc. do not take part in this movement, and the
pendulum or the balance continues undisturbed its oscillations.
Instead of making use of chain, there may, with the described double pulley a, be
employed steel wire rope, gut-string, rope, or band of similar material.
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 manufacturing of damper regulators for fire places which are controlled by a
pendulum or a balance, and which, by means of a double pulley (a), automatically
shut the damper with a varying celerity adapted to the wants of the firing.
Dated this 5th day of June 1880
NEWTON & SON,
Agents for the Applicant.