An Improved Stove-pipe Damper.
Year: 1893

page_text: United States of America).
Date of Application (in United Kingdom), 12th Oct., 1893
Complete Specification Left. 12th Oct.. 1893-Accepted. 2nd Dec., 1893
Date of Application (in United Kingdom), 12th Oct., 1893
Complete Specification Left. 12th Oct.. 1893—Accepted. 2nd Dec., 1893
COMPLETE SPECIFICATION.
An Improved Stove-pipe Damper.
I, CHARLES TREADWELL REDFIELD, of Glen Haven, in the County of
Cayuga, in the State of New York, of the United States of America, Gentleman,
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 consists in a novel attachment of a damper to the pipe whereby
said pipe becomes compressed diametrically on the line of the shaft and the
resilience thereof is utilized for confining the damper in its various adjusted
positions and at the same time the edges of the damper are freed from contact with
the pipe by the aforesaid compression and consequent elongation of the pipe at
right angles to the shaft, and thus the liability of the damper becoming unduly
bound in the pipe is obviated.
The invention also consists in a novel construction of the handle of the damper
and other features of novelty, all as hereinafter more fully described and specifically
set forth in the claims.
In the annexed drawings
Fig. 1 is an end view of a section of a stove-pipe provided with my improved
damper in its closed position.
Fig. 2 is a side view of the same.
Fig. 3 is a transverse section on line X-X in Fig. 1, and
Fig. 4 is a detached plan view of a modification of the damper-shaft.
Similar letters of reference indicate corresponding parts.
P represents the stove-pipe and D the damper, which latter may be composed of
either wrought, cast or malleable iron. Said damper is of smaller diameter than
that of the interior of the pipe, as clearly shown in Fig. 1 of the drawings, for the
purpose hereinafter explained.
a denotes the shaft of the damper. Said shaft is formed of a wrought iron
rod either double as shown in Fig. 1 of the drawings or single as represented
in Fig. 4 of the drawings. It may be attached to the damper in any suitable
manner so as to compel the same to turn with the shaft.
This shaft passes through the pipe and if said shaft is formed of a single piece, one
of the protruding ends thereof is split longitudinally and spread apart to form a
bearing on the exterior of the pipe. When the shaft is formed of a rod bent
double, the protruding ends thereof are spread apart in the same manner and for
the same purpose. The opposite protruding end I provide with a handle h and
with a shoulder bearing on the exterior of the pipe.
The two bearings on opposite sides of the pipe compress the same diametrically on
the line of the shaft, said compression being allowed by the smaller diameter of the
damper than that of the interior of the pipe. The resilience of said pipe subjects
the said bearings to sufficient friction to sustain the damper in its adjusted position,
and at the same time elongates the pipe transversely so as to hold it out of contact

page_text: with the edges of the damper at opposite sides of the shaft, and thus obviates the
liability of the damper becoming bound in the pipe.
C
I do not wish to be limited to the splitting and spreading of the end of the shaft
for the purpose of forming the aforesaid bearing on the exterior of the pipe,
inasmuch as the same result can be obtained by forming a head on said end of the
shaft. The bearing on the opposite end of the shaft I preferably form as a
shield c which is mounted on the shaft and pressed against the pipe by a spiral
spring d interposed between the handle h and shield and surrounding the shaft.
Said spring together with the resilience of the compressed pipe forms a partial
lock to the damper and effectually sustains the same in its desired position. The
chief purpose of the shield, however, is to protect the handle h from the heat of
the pipe. This handle is formed by bending the rod of which the shaft is composed
into the shape of a loop 7 upon opposite sides of which I place separate disks ee of
wood or other suitable material which is a poor heat-conducting material. These
disks I press upon the loop 7 so as to cause the latter to become partially embedded
in the disks and thus obtain a firm hold thereon. These disks are fastened to the
loop by a rivet or rivets i passing through the disk and loop as shown in Fig. 3 of
the drawings.
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. The combination, with a stove-pipe, of a damper smaller in diameter than the
interior of the pipe, and bearings on opposite ends of the damper-shaft compressing
the pipe diametrically on the line of the shaft, whereby the pipe is made to pinch
the edges of the damper adjacent to the shaft thereof, and the pipe is loosened
from the edges of the damper on a line at right angles to the shaft substantially as
described and shown.
2. The combination with a stove-pipe and damper, of the damper-shaft passing
through the pipe and having one of its protruding ends provided with a bearing on
the exterior of the pipe, a spring on said shaft compressing the pipe, and the opposite
protruding end split longitudinally and spread apart to confine the pipe diametrically
compressed as and for the purpose set forth.
3. The combination of the damper-shaft formed at one end with the loop
separate disks ee of wood or analogous material applied to opposite sides of said
loop, and the rivet i passing through said disks and center of the loop and holding
the loop partly embedded in the disks substantially in the manner set forth and
shown.
4. In combination with the stove-pipe, a damper having its shaft passing through
the pipe and provided at one end with a bearing on the exterior of the pipe and
the opposite end of said shaft bent into a loop, disks of wood applied to opposite
sides of the loop, a rivet tying the disks to the loop, a shield mounted on the shaft
and a spiral spring on the shaft between the disks and shield and pressing said
shield against the pipe and compressing the same diametrically as set forth.
Dated this 20th day of September 1893.
CHARLES TREADWELL REDFIELD.
Haseltine, Lake & Co.,
45, Southampton Buildings, London, Agents for the Applicant.