Improvements in Dampers or Draught-regulators for Chimney Flues.
Year: 1890

page_text: Date of Application, 11th Mar., 1890
Complete Specification Left, 11th Dec., 1890-Accepted, 17th Jan., 1891
PROVISIONAL SPECIFICATION.
Improvements in Dampers or Draught-regulators for Chimney
Flues.
I, JAMES KEITH, Assoc. M. Inst. E. of 57, Holborn Viaduct in the City of
London, Gas, Hydraulic, Heating and Ventilating Engineer do hereby declare the
nature of this invention to be as follows:-
This invention relates to dampers or draught regulators of the kind described in
the Specification of Letters Patent granted to me No. 98984 of 1889 and it has for
its object in cases where several flues, as for example in ranges, communicate with
one chimney, to provide for closing simultaneously both the outlet for smoke or
heated gases and the ingress of air to any of the flues so as not to interfere with the
draft through other flues of the range.
To that end the hinged or pivotted flap which as described in the Specification
above referred to serves when tilted to close or partially close the outlet flue for gases
or the orifice for indraught of air is under the present invention duplicated, two such
flaps or plates being fitted on the same hinge or pivot pin. One of the flaps may be
made fast on the pivot pin and is operated by a hand lever secured on said pin and
weighted whilst the other flap may be operated by means of a separate knob or eye
hook with a ratchet directly attached or hinged to the flap or plate. Or, as is
preferred, the spindle forming the pivot pin of the hinge can be divided in the centre
forming two separate spindles on one axial line both spindles being weighted by levers
to balance the weight of the flaps, and both flaps being separately fastened the one
in the centre and the other at one of the sides on the same hinge.
The levers spindles or flaps can be held in any position, either by a ratchet, or by
the binding down of the outside journals of the spindles by set screws or nuts and
holts on the loose cover or flange forming one half of the said journals. By the
arrangements described both flaps may in ordinary circumstances be operated in
unison in which case they lie close together like a single plate; and when the draught
of an adjoining flue might be effected by the opening of the air inlet orifice on closing
or partially closing the flaps, the rear flap alone is used to serve as a damper and the
front flap can be drawn or moved forward by hand to close the air inlet opening
more or less as the case may require.
The improved device serves not only as a damper and air register or ventilator but
also as a cleaning door for giving access to the flue and it is applicable under various
modifications as to form or shape to ranges, stove pipes and other flues.
Dated this Tenth day of March 1890
"
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in Dampers or Draught-regulators for Chimney
Flues.
I, JAMES KEITH, Assoc. M. Inst. C.E. of 57 Holborn Viaduct in the City of
London, Gas, Hydraulic, Heating and Ventilating 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 to dampers or draught regulators of the kind described in
the Specification of Letters Patent granted to me No. 9898 of 1889 and it has for
its object in cases where several flues, as for example in ranges, communicate with
one chimney, to provide for closing simultaneously both the outlet for smoke or heated
Q1

page_text: gases and the ingress of air to any of the flues so as not to interfere with the draft
through other flues of the range. To that end the hinged or pivotted flap which is
described in the Specification above referred to serves when tilted to close or partially
close the outlet flue for gases or the orifice for indraught of air is under the present
invention duplicated two such flaps or plates being fitted on the same hinge or
pivot pin.
In the accompanying drawings,
Figures 1 and 2 are respectively side and front views shewing the devices applied
to a horizontal flue and Figures 3 and 4 like views shewing it applied to a vertical
Alne such as that of a cooking range.
Figures 5 and 6 shew the device fitted to the back-plate of a range so as to be
capable of being bodily removed and Figures 7 and 8 shew modified forms of the
device applied to a vertical flue.
Figures 9 and 10 are respectively a vertical and a horizontal section of the device
as applied to a hot water or other boiler or furnace fine.
Figures 11, 12 and 13 are respectively a vertical section, an end view and a
horizontal section shewing the device applied to a vertical boiler or other fine.
Figures 14 and 15 show it applied to a horizontal wall flue.
The device in its various forms is composed of two flaps or plates A and B pivotted
within the flue piece C in proximity to an air inlet orifice D and adapted to be turned
on their pivotal axis so that either or both may close or partially close the fine opening
or the air inlet or both. One of the flaps A is made fast on one length
a of the
pivot pin and the other B, on a soparate length of said pin and both are inde-
pendently operated by hand levers A', B'. The air inlet orifice is when convenient
covered by a framing F, betweon which and the flue piece journal bearings are
formed for the pivot pins This framing may be secured to the flue piece by screws
as in Figures 3 and 4 or as shewn at Figures 5 and 6 it may be fitted to slip into its
place and he held by suugs e on the flue plato F, engaging projections e¹ on the
framing E these permitting of the framing and damper device being bodily removed
and access to the flue obtained for cleaning either upwards or downwards.
The levers spindles or flaps may he held in any position by the binding down of
the outside journals of the spindles by set screws or nuts and bolts on the loose cover
or flange piece E, forming one half of the said journals as indicated at Figures 3
and or by clamps G, as shown at Figures 1 und 2 or by segmental ratchets as
shewn at Figures 5 and 6 and 9 to 13 or by weighted arms as indicated at Figures 14
and 15 or by any frictional devices. By fitting the flaps in a recessed frame E in
front of the flue as shewn at Figures 7 and 8 they may be tilted to close or partially
close the flue or stil! further tilted as indicated by dotted lines to leave the flue open
and enable a brush to be pushed either upwards or downwards through the air inlet
to clean the flue.
By the arrangements described both flaps may in ordinary circumstances be
operate in unison in which case they lie close together like a single plate; and when
the draught of an adjoining flue might be affected by the opening of the air inlet
orifice on closing or partially closing the flaps, the rear flap alone is used to serve as a
damper and the front flap can be drawn or noved forward by hand to close the air
inlet opening more or less as the case may require, the rear flap A thus forming a
damper whilst the front flap B forms an air register.
The improved device serves not only as a damper and air register or ventilator but
also as a cleaning door for giving access to the flue and it is applicable to ranges stove
pipes and other Hues.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, 1 declare that what I
claim is :-
1. A combined damper, air register and cleaning door for flues composed of two
plates or flaps pivotted on the same axis within a flue piece and adapted to close o
partially close either the flue or air inlet or both substantially as described.

page_text: 2. The combination with a stove pipe or other flue of a duplex damper composed of
two plates or flaps pivotted on the same axis in close proximity to an air inlet in the
flue substantially as and for the purpose set forth.
3. The combination of a flue piece having an air inlet orifice two flaps pivotted on
the same axis therein and at the edge of said inlet and handles or like means for
operating said flaps together or separately substantially as described.
Dated this Tenth day of December 1890.
CRUIKSHANK & FAIRWEATHER.
62, St. Vincent Street, Glasgow, Agents.