Ventilating Elbow Pipe for Stoves.
Year: 1895

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Date of Application (in United Kingdom), 9th Aug., 1895
Complete Specification Left, 6th May, 1896-Accepted, 6th June, 1896
PROVISIONAL SPECIFICATION.
I, REINHOLD CARL DOENITZ of Iron River, County of Iron, State Michigan,
United States of America, Mechanic, do hereby declare the nature of this
invention to be as follows:-
In this invention the elbow pipe of a stove is formed with an offset or extension
in which is fitted a cap carrying a fan, the outer end of the cap being provided
with apertures closeably by a disc turning on a central pin so as to shut off the
access of air and passage of the same past the fan when necessary. The closing
disc is held open by a weight and shut by a spring. The ordinary draught of the
stove will cause the fan to revolve and draw air from the room or surrounding
space. A forced draught is obtained by driving the fan at a high speed through a
pinion on the fan spindle and a toothed wheel operated from a handle said toothed
wheel being mounted so as to be readily engaged and disengaged from the pinion
by swinging it out of the way.
LoL dan of At 1805
THOMAS R. SHILLITO,
89 Chancery Lane, London, W.C., Agent for the Applicant.
Ventilating Elbow Pipe for Stoves.
1, REINHOLD CARL DOENITZ of Iron River, County of Iron, State Michigan,
United States of America, Mechanic, 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 elbow joints and more particularly to right angle elbow
joints for stoves.
The object of this invention is to provide an elbow joint with improved means
for ventilating a chamber through the stove pipe; also improved means for
increasing or forcing the draft, and providing an entrance through which the stove
pipe may be cleaned without detaching the same from the stove or chimney.
In the accompanying drawing
Fig. 1 is a front elevation shewing an end view of the ventilating cap attached
to a right angle elbow and arranged at right angles to one and opposite to the
other joint thereof, which latter is not shewn.

page_text: Fig. 2 is a horizontal section taken on the line 2-2 of Fig. 1.
Fig. 3 is an inside plan view of the cover detached.
Fig. 4 is a front elevation shewing means for applying a forced draught.
Fig. 5 is a vertical section taken on the line 5-5 of Fig. 4.
Fig. 6 is a side elevation of a stove and smoke pipe, shewing my invention
applied adjacent to the stove and connecting the lower end of the pipe therewith.
A is one joint of the elbow, and B the other joint projecting at right angles
thereto, and C is an offset in the elbow arranged opposite to the joint B and at
right angles to the joint A as shewn in Fig. 5.
D is a detachable cap which fits inside the inner walls of the offset, open upon
the inside, and provided with a perforated end plate and slide d which affords, when
open, an exit for the air of the chamber. Said slide is provided with a weight d¹
on one side for holding the slide open, and on the opposite side has fastened
thereto a coiled spring d terminating in a hook which engages a knob secured to
the stove pipe for holding the slide closed.
E is a fan or blower operated, when the slide is open, by the draft, but which
may also serve, for giving a forced draft. Said fan is mounted inside of the cap
on a shafte which is journalled at one end to a short bowed' arm secured to the end
plate of the cap. The other end of the shaft is journalled in an arm e¹ extending
diametrically from side to side and secured to the inner walls of said cap by its
outwardly bent ends as shewn in Figs. 2 and 5. Said arm and its bent ends also
serve as a brace for supporting the walls of the cap. In Figs. and 5 the fan is
shewu differently mounted. Instead of using the short arm attached to the end
plate of the cap, the shaft is extended through the plate and provided with a
pinion F which engages with a larger gear wheel G operated by a handle or stud g.
The wheel Gis mounted on a pivotted arm g¹ held by set screw g³ secured to the
end plate of the cap.
When it is desired to use the fan to create a forced draft the arm g¹is swung
into the position shewn in Fig. 4. The wheel G will then engage with the
pinion F. Good results may be obtained by closing the slide before operating the
wheel G to produce the forced draft, or the slide may be partly closed. When
closed, the action of the fan, being at the base or end of a section of vertical pipe,
as shewn in Fig. 6, will cause the air in the section to be forced upwardly or
outwardly in the direction of the chimney and thus create a forced draft which
draws the air in through the stove. When the forced draft is not in use and it is
desired to employ the fan for ventilating purposes, the arm g¹ is swung back which
disconnects the gearing and allows the pinion F to revolve freely.
It is evident that the elbow joint is adapted for use in any line of stove pipe, and
furnishes a simple and efficient means for ventilating a room. It also affords an
opening in a line of stove pipe through which the pipe may be cleaned without
disconnecting the same.
The invention is also adapted for causing a forced draft when the fire is lighted
for when it is desired to increase the draft at any time.
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 :-
1. An elbow joint composed of two sections arranged at right angles to each
other, a detachable cap arranged in line with one section and at right angles to the
other section and provided with a ventilating valve or slide, substantially as
described and shewn, for the purpose specified.
2. An elbow joint composed of two sections arranged at right angles to each
other; an offset arranged in line with one section and at right angles to the other
section; and a detachable cap for the offset having a perforated end and ventilating
fan, substantially as described and shewn, for the purpose specified.
3. An elbow joint composed of two sections arranged at right angles to each
J.

page_text: other, a detachable cap arranged in line with one section and at right angles to the
other, a fan mounted in the cap, and means for operating the fan to cause a forced
draft substantially as described and shewn, for the purpose specified.
Dated this 6th day of May 1896.
THOMAS R. SHILLITO,
89 Chancery Lane, London, W.C., Agent for the Applicant.