Improvements in Dampers for Bakers' Ovens and for other purposes.
Year: 1895

page_text: Date of Application, 26th Nov., 1895
Complete Specification Left, 19th Aug., 1896-Accepted, 10th Oct., 1896
PROVISIONAL SPECIFICATION.
Improvements in Dampers for Bakers' Ovens and for other
purposes.
We, JOHN HENRY MARTIN, NOAH MARTIN, and BENJAMIN DAVIES
MARTIN, trading as The Nitram Foundry Company, of Oakengates, in the
County of Salop, Manufacturers, do hereby declare the nature of this invention
to be as follows:-
This invention relates to improvements in dampers for bakers' ovens and for
other purposes, our object being to construct a simple damper or door, capable
of very ready manipulation, that shall effectually close a flue or other aperture
and prevent the escape of steam, or other gaseous body from an oven or other
chamber.
In the application of our invention to the construction of a damper for preventing
the escape
of steam from a bakers' oven, we construct the damper frame or seating
of a hollow-square, or other suitable configuration, preferably from cast iron, the
sides having a trough like section for the reception of the jointing substance herein-
after described. Upon one side or end of the frame we form lugs or projecting
pieces to receive the trunnions or supporting pins cast or formed upon the damper.
The damper consists of a cast iron or other metal plate, having a spigot or
projecting rib on its inner side for entering within the trough or groove of the
damper frame. We cast or form trunnions or supporting pins upon one side or
end of the damper which seat within or upon the lugs or projecting pieces of
the frame. We attach one end of a lever with toothed or racked edges to the
damper, and cause its outer or free end to project in front of the flue or chimney
in which the damper frame is built or fixed, for the purpose of opening or
closing the damper, or we employ any other suitable means for manipulating the
same, as may be required.
To prevent the escape of steam from the oren when the damper is closed, w
employ packing or jointing material such as sand, finely ground fire-clay, or other
suitable material, which we place within the trough or groove of the frame. On
closing the damper the spigot or projection from its inner side enters into the
jointing material, and thus an effectual seal is formed for preventing the escape of
steam.
Instead of sand, or other mobile solid material, we sometimes employ water or
other liquid for the purpose of forming the steam or air-tight seal, or we may
employ asbestos or other suitable packing material in the form of flat strips or
otherwise.
We do not limit the application of our invention to any one form or pattern of
damper, but adapt the same in the construction of air-tight or like doors or dampers
for varying services, making such modifications as may be necessary to suit particular
requirements.
Dated this 95th day of November 1895
MARKS & CLERK,
18 Southampton Buildings, London, W.C., and
13 Temple Street, Birmingham, Agents for the Applicants.

page_text: COMPLETE SPECIFICATION.
Improvements in Dampers for Bakers' Ovens and for other
purposes.
We, JOHN HENRY MARTIN, NOAH MARTIN, and BENJAMIN DAVIES
MARTIN, trading as The Nitram Foundry Company, of Oakengates, in the
County of Salop, Manufacturers, 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 improvements in dampers for bakers' ovens and for
other like purposes, our object being to construct a simple damper or door, capable
of very ready manipulation, that shall effectually close a flue or other aperture
and prevent the escape of steam or other gaseous body from an oven or like
chamber.
In the accompanying sheet of explanatory drawings to be hereinafter referred
to.-
Figure 1 represents a complete damper constructed in accordance with our
invention and fitted within the flue of a bakers' oven.
Figure 2 is a front elevation of the flue door.
Figure 3 is a plan of the complete damper.
Figure 4 is a sectional elevation through the complete damper and a portion of
the flue in which it is fixed or set.
The same reference letters in the different views indicate the same parts.
We construct the damper frame or seating A of a hollow-square or other suitable
configuration, preferably from cast iron, the sides having a trough-like section, as
illustrated at Figure 4, for the reception of the jointing substance hereinafter
described. Upon one side or end of the frame we form lugs or projecting pieces A¹
to receive the trunnions or supporting pins cast or formed upon the damper.
The damper itself consists of a cast iron or other metal plate such as B having
a spigot or projecting rib B' on its inner side for entering within the trough or
groove of the damper frame A. We cast or form trunnions or supporting pins B2
upon one side or end of the damper which seat within or upon the lugs or projecting
pieces A of the frame. We hinge or attach one end of a bar or lever C to the
damper, the opposite end being caused to project in front of the flue door D, for
the purpose of opening or closing the damper B. The bar or lever C may have a
toothed or racked edge to enable it to be secured, but we preferably arrange for
sustaining the door at any intermediate position between its closed position, as at
Figure 1, or its fully open position, as at Figure 4, by means of a pin such as E
chained to the door D which can be passed through either of the holes c. On the
front or face of the door D we fix an adjustable ventilator such as F to assist in the
ventilation of the bake-house.
To prevent the escape of steam from the oven when the damper is closed, we
employ packing or jointing material, preferably fine sand, which we place within
the trough or groove of the frame as illustrated at Figure 4. On closing the damper
the spigot or projection B' from its iuner side enters into the jointing material, and
thus an effectual seal is formed for preventing the escape of steam.
The damper B is prevented from accidental detachment from its frame A by
means of the lugs or brackets such as a, shown by dotted lines at Figure 3, which
we rivet or otherwise attach to the frame A.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is.―

page_text: and arranged substantially as hereinbefore described and as illustrated in the
accompanying drawings.
2. The combination of a plate such as B having a spigot or projecting rib B¹ on
its under or inner side, and a regulating bar or lever such as C hinged or attached
to its upper or outer side, with a hollow frame such as A having trough-like sides
for the reception of jointing material, substantially as and for the purposes herein-
before described and as illustrated in the accompanying drawings.
Dated this 12th day of August 1896.
MARKS & CLERK,
18 Southampton Buildings, London, W.C., and
13 Temple Street, Birmingham, Agents for the Applicants.